CN100393117C - Turning-off delay circuit for video apparatus - Google Patents

Turning-off delay circuit for video apparatus Download PDF

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Publication number
CN100393117C
CN100393117C CNB2004100153037A CN200410015303A CN100393117C CN 100393117 C CN100393117 C CN 100393117C CN B2004100153037 A CNB2004100153037 A CN B2004100153037A CN 200410015303 A CN200410015303 A CN 200410015303A CN 100393117 C CN100393117 C CN 100393117C
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China
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circuit
video equipment
voltage
power supply
voltage comparator
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CN1652588A (en
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李鸿安
杨秀凤
戴俊
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Shenzhen Skyworth RGB Electronics Co Ltd
Shenzhen Chuangwei RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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Abstract

The present invention discloses a turning-off delay circuit for video devices. The present invention is connected between a secondary output end of a transformer of an internal power source of a video device and a cathode of a picture tube of the video device. The present invention comprises a power supply circuit of an output end (3), a followed power supply circuit (4) and a Voltage comparison circuit (5). When a general supply of a video device is switched off or in the stand-by state, the power supply circuit of an output end (3) and the followed power supply circuit (4) discharge electricity to respectively supply reference voltage and comparison voltage to the voltage comparison circuit (5); when the comparison voltage is larger than the reference voltage, the voltage comparison circuit (5) is switched on; electric current released by the followed power supply circuit (4) is supplied to the cathode of the picture tube, and the picture tube enters into the gradual shrinking state as the discharge is weakened gradually. The present invention overcomes the unfavorable phenomena that in the prior art, when video devices of a TV, a computer monitor, etc. are turned off, the picture tube has bright points, color spots, etc., and the service life of the picture tube is prolonged.

Description

Video equipment shutdown delay circuit
[technical field]:
The present invention relates generally to the shutdown delay circuit that video equipment is used.
[background technology]:
In the prior art, video equipments such as television set generally have the switching on and shutting down spot suppressor, and this circuit often adopts releasing type or cut-off type, resistance to let out formula.Releasing type shutdown dazzling bright sudden strain of a muscle band is arranged and start shooting again unfavorable to the superhigh pressure rectifier diode.Cut-off type can produce high-pressure electrostatic and inhale dust, but also still has " color spot " phobia shortcoming after shutdown is arranged.Though early have the people to propose " grating is shrinkage type gradually " notion, do not have manufacturer can propose and realize this scheme as yet perfectly.In recent years, all manufacturers other and bleeder resistance on kickback transformer superhigh pressure winding rectification filtering circuit.Though can eliminate bad phenomenon such as machine open/close bright spot, color spot, it is bigger to the cost impact of kickback transformer to increase this resistance, strengthen kickback transformer manufacturer cost, and all unfavorable to picture tube and kickback transformer and machine life.
[summary of the invention]:
Purpose of the present invention is exactly in order to overcome the deficiencies in the prior art, provide a kind of can make the video equipment shutdown time picture tube grating progressively shrink, eliminate the circuit of bad phenomenon such as off-spot, color spot.
The present invention proposes a kind of video equipment shutdown delay circuit for this reason, comprise input power circuit 3, continued access power circuit 4, voltage comparator circuit 5; Described input power circuit 3, continued access power circuit 4 inputs are connected with video equipment internal transformer secondary output end, be used for when the video equipment general supply is cut off the power supply or entered holding state, being respectively described voltage comparator circuit 5 reference voltage, comparative voltage being provided; The reference voltage input terminal of described voltage comparator circuit 5 is connected with described input power circuit 3 outputs, the comparative voltage input of described voltage comparator circuit 5 is connected with described continued access power circuit 4 outputs, and the output of described comparison circuit 5 is connected with the tube cathode of video equipment; When the video equipment general supply is cut off the power supply or is entered holding state, when described comparative voltage is higher than reference voltage, described voltage comparator circuit 5 keeps conducting state, and the electric current that described continued access power circuit 4 is discharged imposes on the video equipment tube cathode, and the picture tube grating is progressively shunk.
Above-mentioned video equipment shutdown delay circuit, also comprise control circuit 9, be connected between the reference voltage input terminal and described input power circuit 3 of described voltage comparator circuit 5, be used for when the video equipment operate as normal, control voltage comparator circuit 5 is in cut-off state, after total outage or standby, when power supply drops to a certain degree and again during vertical blanking impulse the time, control voltage comparator circuit 5 is in conducting state.
Above-mentioned video equipment shutdown delay circuit, described input power circuit 3 comprises main charge-discharge circuit, be connected between video equipment internal transformer secondary output end and the ground, be used for when the video equipment operate as normal, charge, when the video equipment general supply is cut off the power supply or entered holding state, a reference voltage is provided for voltage comparator circuit 5.Described continued access power circuit 4 comprises time delay discharge circuit, be connected between video equipment internal transformer secondary output end and the ground, be used for when the video equipment operate as normal, charge, when the video equipment general supply is cut off the power supply or entered holding state, a comparative voltage is provided for described voltage comparator circuit 5.
Above-mentioned main charge-discharge circuit comprises main charge and discharge capacitance C21, and its anode is connected minus earth with video equipment internal transformer secondary output end.Described time delay discharge circuit comprises charge and discharge capacitance C81, rectifier diode D81, the anode of described rectifier diode D81 is connected with video equipment internal transformer secondary output end, negative electrode is connected with described charge and discharge capacitance C81 anode, described capacitor C 81 minus earths.Described voltage comparator circuit 5 comprises switch triode A81, its base stage is connected with the anode of described main charge and discharge capacitance C21, emitter-base bandgap grading is connected with the anode of described charge and discharge capacitance C81, and collector electrode is as the switching signal output, and the electric current that described charge and discharge capacitance C81 is discharged outputs to tube cathode.Described control circuit 9 comprise clamp diode V44 and with biasing resistor R822, the clock (V.BLK) of the capacitors of clamp diode V44 connection, the anode of described clamp diode V44 connects the anode of main charge and discharge capacitance C21, negative electrode is connected the base stage of switch triode A81 with the interface point of biasing resistor R822, the other end of biasing resistor R822 connects to make makes the clock V.BLK of switch triode A81 in the field blanking interval conducting under total outage or the holding state.Described voltage comparator circuit 5 also comprises the collector load branch road, comprise load resistance R84, or the series arm of load resistance R84 and first, second and third voltage-stabiliser tube D82-D84 parallel branch, described branch road is serially connected with between the collector electrode and tube cathode of described switch triode A81.
Above-mentioned video equipment shutdown delay circuit also comprises power on and power off muffling branch road 8, and cross-over connection is between described voltage comparator circuit 5 outputs and squelch switch circuit exit; Audio frequency impact signal when being used to eliminate switching on and shutting down.
Owing to adopt above scheme, between video equipment internal electric source and picture tube RGB, set up the shutdown delay circuit, when the video equipment general supply disconnects or enters holding state, the picture tube outage, the interior continued access power circuit discharge of delay circuit this moment, power to picture tube RGB through voltage comparator circuit, make the RGB conducting, along with progressively weakening of discharge, make picture tube enter contraction state gradually, picture tube has bad phenomenon such as bright spot, color spot when having overcome the shutdown such as television set, computer of prior art, prolongs the useful life of picture tube.
Circuit of the present invention is simple, and is with low cost, is lower than the cost of taking the prior art scheme.
[description of drawings]:
Fig. 1 is a schematic block circuit diagram of the present invention;
Fig. 2 is shutdown delay circuit embodiment one circuit theory diagrams of the present invention;
Fig. 3 machine open/close protecting against shock sound is double cuts bright spot and CRT filament pre-heating circuit embodiments one schematic diagram of lengthening the life;
Fig. 4 machine open/close protecting against shock sound is double cuts bright spot and CRT filament pre-heating circuit embodiments two schematic diagrams of lengthening the life;
Fig. 5 machine open/close protecting against shock sound is double cuts bright spot and CRT filament pre-heating circuit embodiments three schematic diagrams of lengthening the life;
Fig. 6 machine open/close protecting against shock sound is double cuts the lengthen the life functional block diagram of circuit of bright spot and CRT filament pre-heating;
Fig. 7 machine open/close protecting against shock sound is double cuts bright spot and the CRT filament pre-heating circuit embodiments one local schematic diagram of lengthening the life;
Fig. 8 machine open/close protecting against shock sound is double cuts bright spot and the CRT filament pre-heating circuit embodiments two local schematic diagrams of lengthening the life;
Fig. 9 machine open/close protecting against shock sound is double cuts bright spot and the CRT filament pre-heating circuit embodiments three local schematic diagrams of lengthening the life;
Figure 10 tandem tap power supply and pressure swing type Switching Power Supply direct sample voltage stabilizing regulating circuit embodiment one schematic diagram;
Figure 11 tandem tap power supply and pressure swing type Switching Power Supply direct sample voltage stabilizing regulating circuit embodiment two schematic diagrams;
Figure 12 is that each power work state switches relevant sequential oscillogram;
Figure 13 is a kickback transformer FBT characteristic pattern;
Figure 14 is series amplification rheostatic voltage-stabilized power supply circuit figure;
Figure 15 is that each part mentioned above figure makes up back integrated circuit figure;
Figure 16 is light lotus root-metal-oxide-semiconductor pincushion correction circuitry embodiment one schematic diagram;
Figure 17 is light lotus root-metal-oxide-semiconductor pincushion correction circuitry embodiment two schematic diagrams;
Figure 18 is light lotus root-metal-oxide-semiconductor pincushion correction circuitry embodiment three schematic diagrams;
Figure 19 is light lotus root-metal-oxide-semiconductor pincushion correction circuitry embodiment four schematic diagrams;
Figure 20 is that above-mentioned all figure make up back integrated circuit figure;
Figure 21 is shutdown delay circuit embodiment two circuit theory diagrams of the present invention.
[embodiment]:
For further specifying enforcement of the present invention,, technical scheme is described in detail below in conjunction with accompanying drawing:
Realize that overall plan of the present invention is: two groups of voltage sources of voltage difference are arranged in series amplification rheostatic voltage stabilizer (AVR) input in and output out or the source of getting, set up respectively and can make after the outage picture tube CRT enter grating to make picture tube CRT enter cut-off state circuit 2 after the circuit 1 of contraction state and outage or line scanning start or suspend gradually.Referring to [Fig. 6 example].Setting up is by looking the monostable picture tube CRT filament preheating circuit of putting 2, referring to Fig. 7 or Fig. 8 example.Enter during the outage of the picture tube set up white raster gradually the circuit 1 of contraction state referring to Fig. 2.Can make picture tube CRT enter the grating circuit 1 of contraction state gradually after the outage of setting up, can be by compatible switch machine impulsive-sound eliminating function behind the diode D88 branch road; And with institute setting up after looking monostable pulsed picture tube filament preheating circuit 2 combinations of putting, compatible again formation picture tube switching on and shutting down spot suppressor.
Realize that concrete feature of the present invention is: select for use to get to come from kickback transformer FBT or the secondary arbitrary output of switching mode power supply transformer, behind series amplification rheostatic voltage stabilizer AVR, (can power to look put preposition etc.), at this series amplification rheostatic voltage stabilizer AVR input in (capacitor C 21), after diode D81 branch road commutation capacitor C83 filtering, as PNP triode A81 outage back power supply source, at this series amplification rheostatic voltage stabilizer AVR output out (capacitor C 9), after diode D71 branch road commutation capacitor C71 filtering, as amplifier tube A72 outage back power supply source.Two triode A81 and A72 all instead end partially during operate as normal.When general supply outage or standby, after at first making triode A81 conducting, make picture tube CRT three rifle RGB conductings enter white raster contraction state gradually by diode D82 parallel with one another, D83, D84 respectively, can force noise reduction MU by (or removal) diode D88 branch road simultaneously.Require this moment line scanning prime power supply appearance capacity very big.[even can guarantee the half that drops after shutdown of main load terminal voltage or the standby, still can produce the output of row energization signal by normal power supply, keep grating and can enter contraction state gradually].After, when this input end capacitor C21 continuation drop deficiency is kept this pressurizer AVR output voltage stabilizing value, or when entering halted state, make the drop of this pressurizer AVR output (capacitor C 9) voltage follow, make another triode A72 by original anti-partially by transferring the positively biased conducting state to, by inverter A83 collector electrode diode connected in parallel D85, D86, D87 forces to turn-off video amplifier circuit, make three negative electrode RGB of picture tube CRT enter cut-off state, this helps superhigh pressure and not exclusively discharges, to next starting up's line scanning, it is favourable to alleviate the anti-surge impact of superhigh pressure winding silicon particle unlatching rectification overcurrent.Above-mentioned triode A72 and rearmounted triode A83 constitute special-shaped multiple tube, constitute the positive feedback role of network by increasing capacitor C 76 resistance R 76 timing elements between preposition triode A72 base stage and the back utmost point triode A83 base stage (or collector electrode), has monostable pulse character after making triode A83, A72 combination, as the picture tube filament preheating circuit.(replaceable software control).Starting up or time-out or holding state are forced to be the blank screen state for a moment by three diode D85, D86, D87 shutoff picture tube RGB three rifle beam electronic currents before just having transferred operate as normal to without exception at every turn; make the main steady magnitude of voltage in original drop back slow gradually liter of being expert at behind the scanning work recover operate as normal and should need after the voltage stabilizing value for a moment; after making the abundant preheating of picture tube filament normal; could remove above-mentioned monostable impulse circuit and turn-off the picture tube function, make picture tube enter the grating normal operating conditions.Reach and prolong CRT life-span benefit.
Above technical scheme also can realize by the integrated package internal circuit.According to previewing discharge source voltage height in the integrated package as detection resources, according to the solution of the present invention, the previewing source is entered just be in the white raster state when standby makes DOFF without exception, when previewing discharge source voltage falling certain value, the automatic blank screen of another rule does not have the line state.Can related parameter be arranged with software adjustment.The innovation overcome the prior art standby start shooting the CRT filament again can not the preheating shortcoming.
The remarkable advantage of taking above technical scheme to bring is: increase picture tube filament pre-heating function, prolong the picture tube life-span; The dual-purpose performance that should use up of performance circuit is reduced the number of the element number, can make filament pre-heating, the machine open/close spot suppressor impulsive-sound eliminating combination of circuits one of holding concurrently, and cost is low, makes properties of product/price than improving.Machine open/close does not have dazzling bright sudden strain of a muscle band or " color spot " phobia shortcoming and starts shooting to the favourable advantage of superhigh pressure rectifier diode again.Significantly improve P/C than the advantage except that having described the giving prominence to of the object of the invention, the concrete detailed embodiment of advantage illustrates respectively.
Describe realization best way of the present invention in detail below in conjunction with the accompanying drawing example.Preamble has been stated or has no longer been repeated in conjunction with continue to use prior art or in like manner should change etc.
Cut bright spot, squelch circuit shortcoming in order to eliminate the prior art machine open/close, CRT filament pre-heating, life-prolonging function are provided.[Fig. 3 or Fig. 4 example]: select for use to get to come from kickback transformer FBT or the secondary arbitrary output of switching mode power supply transformer, behind series amplification rheostatic voltage stabilizer AVR, can power to look put preposition etc., at this series amplification rheostatic voltage stabilizer AVR input in (capacitor C 21), after anti-adverse current diode D81 branch road commutation capacitor C81 filtering, as PNP triode A81 outage back power supply source, at this series amplification rheostatic voltage stabilizer AVR output out (capacitor C 9), after anti-return diode D71 branch road commutation capacitor C71 filtering, as PNP amplifier tube A72 outage back power supply source.Two triode A81 and A72 all instead end partially during operate as normal.
Video equipment off delay circuit as shown in Figure 1 comprises input power circuit 3, continued access power circuit 4, voltage comparator circuit 5, noise reduction branch road 8; Video equipment shutdown delay circuit embodiment one circuit theory diagrams as shown in Figure 2, capacitor C 21 is as the main charge-discharge circuit in the input power circuit, can be again by after the diode D81 rectification after capacitor C 81 chargings, be that rectifier diode D81 and capacitor C 81 constitute time delay discharge circuit, as continued access power circuit 4; Switch triode A81 is as voltage comparator circuit 5.After outage or standby, because after capacitor C 81 is full of crest voltage by diode D81 rectification, as triode A81 emitter power supply.During operate as normal, capacitor C 81 current potentials make the anti-cut-off state partially of triode A81 less than transistor base branch road power supply C21 current potential.Shutdown or during standby capacitor C 81 discharges penetrate collection utmost point loop by way of mainly penetrating the chain triode A81 of base knot bias loop by triode A81, when base potential during less than emitter current potential 0.6V, triode A81 conducting.Capacitor C 81 electric charges are connected in series triode D82, D83, D84 respectively again, make picture tube CRT three rifle RGB conductings enter white raster contraction state gradually more respectively.Because capacitor C 21 voltages are higher than about capacitor C 81 current potential 0.7V during operate as normal, and triode A81 is instead ended partially.When total outage or standby, because capacitor C 21 has bigger load, discharge stream is fast, so capacitor C 21 current potentials will drop relatively gradually.When capacitor C 1 voltage falling during less than the capacitor C 81 current potential 0.6V left and right sides, triode A81 just by anti-partially by transferring conducting state to.Resistance R 81, R82 and R83 penetrate base knot partial pressure type biasing resistor as the PNP pipe.Resistance R 83 can also be cut down the penetrating current influence.Prevent because of power supply C21 fluctuation misoperation.Capacitor C 83 is used for anti-interference, can remove interference.
By diode D88 branch road output high level, trigger the action of sound accompaniment effect and relevant squelch circuit thereof during outage or standby simultaneously.Audio power amplifier all can have squelch switch function exit.Many direct high level noise elimination exits are arranged.If the low level noise elimination can increase inverter intermediary more.
Can (or removal) width of cloth V.AGC be increased with field output stage power supply reduction by diode D89 branch road.Triode A81 collector load resistor R84 branch road can (increase or remove) serial connection voltage-stabiliser tube.After, when this input end capacitor C21 continuation drop deficiency is kept this pressurizer AVR output voltage stabilizing value, or when entering halted state, make the drop of this pressurizer AVR output (capacitor C 9) voltage follow, when reaching triode A72 base stage electricity and be lower than the emitter voltage value, triode A72 is by original anti-partially by transferring the positively biased conducting state to, by inverter A83 collector electrode diode connected in parallel D85, D86, D87 forces to turn-off to look to put a grade circuit, make three negative electrode R of picture tube CRT, G, B enters cut-off state, this helps superhigh pressure and not exclusively discharges, to next starting up's line scanning, it is favourable to alleviate the anti-surge impact of superhigh pressure winding silicon particle unlatching rectification overcurrent.Not only prolong CRT useful life, and remove among the kickback transformer FBT bleeder resistance and bring shortcoming, reduce the cost.
The second embodiment of the present invention as shown in figure 21, this example inserts a control circuit 9 to amplifier tube A81 base stage branch road among Fig. 2, this control circuit comprises that diode V44 is connected in series branch road mutually with resistance R 822, make diode V44 positive pole get source current C21 positive pole, diode V44 negative terminal and resistance R 82 interface points are connected in triode A81 base stage, making is normally having under the grating operating state, and triode A81 penetrates the base knot and is in zero-bias or anti-partially by off state.This biasing resistor R822 other end V.BLK is connected in (through what export behind the inverter) can make the vertical blanking impulse source that makes triode A81 conducting under total outage or the holding state.Described through inverter output back vertical blanking impulse, in the desirable relevant bootstrapped switch boost capacitor of a field output stage circuit cold end and the integrated package internal electron switch junction, field of coming from of this inverter input.As LA7830, LA7841 grade in an imperial examination 7 pin.Therefore, in the time of can reaching total outage or standby along with capacitor C 21 voltage fallings to a certain degree, and during vertical blanking impulse in the time, make triode A81 conducting export that high level is chain to make picture tube three rifle conductings.Can turn-off the horizontal pulse of line scanning pre-driver by triode A81 collector electrode branch road (X) simultaneously this moment.Obtain field flyback and shield the discharge effect that leaks.The positive pole of electrochemical capacitor C21 is got and is come from kickback transformer FBT or T arbitrary output of level of switching mode power supply transformer, minus earth, after diode D81 branch road commutation capacitor C81 filtering, as PNP triode A81 reserve power supply source when total outage or the standby, series connection place of diode D81 and commutation capacitor C81 connects the emitter of triode A81, the negative pole of clamp diode V44 is connected in series mutually with resistance R 822, positive pole is got the positive pole of source electrochemical capacitor C21, clamp diode V44 negative terminal and resistance R 82 interface points are connected in triode A81 base stage, making is normally having under the grating operating state, and triode A81 penetrates the base knot and is in zero-bias or anti-partially by off state.The biasing resistor R822 other end connects through reverse signal V.BLK that export, that can make the vertical blanking impulse signal that makes triode A81 conducting under total outage or the holding state behind the inverter.V.7 described vertical blanking impulse after inverter output comes from the relevant bootstrapped switch boost capacitor of field output stage circuit cold end and an integrated package internal electron switch junction in that this inverter input is desirable.As LA7830, LA7841 grade in an imperial examination 7 pin, output trace zero potential continues 19 milliseconds, the flyback high potential continues 1 millisecond pulse, so only increase by reverser and just can make forward stroke interval resistance R 822 no bias currents, current circuit is just arranged between flyback, thereby make the base stage branch road of triode A81 pass through biasing resistor R88 turn-on field return period electronegative potential, a forward stroke interval high potential pulse.Principle of the present invention be: owing to increased clamp diode V44, both end voltage is fallen about about 0.7V after clamp diode V44 conducting.When the rising of capacitor C 21 voltages, then diode V44 negative terminal connects triode A81 base potential and follows rising.So capacitor C 21 voltages and make the extremely objective V44 negative terminal of clamper two current potential be not less than triode A81 emitter current potential greater than capacitor C 81 voltages after the operate as normal.During operate as normal, though resistance R 822 has the conducting electric current, since diode V44 clamping action, the disconnected triode A81 conducting in zero Pianguan County forever.But outage always or during standby, waiting to load by the loop put gradually because capacitor C 21 main power supply previewing are put.When capacitor C 21 voltages fell to a certain degree gradually, promptly capacitor C 21 voltages were less than capacitor C 81 voltages, and then clamp diode V44 loses the conducting clamper and makes triode A81 penetrate the disconnected function in base knot zero Pianguan County.That is: the diode V44 negative terminal current potential (transistor base current potential just) that operate as normal should need of can not guaranteeing to start shooting equals or a little higher than emitter current potential, just can guarantee triode A81 zero offset off state, but from the unique discharge loop of capacitor C 81 hot ends footpath: be obedient to that the flow path triode is penetrated base knot EB, resistance R 822 branch road turn-on field flyback electronegative potential clocks make triode A81 conducting.Therefore, the voltage along with capacitor C 21 in the time of can reaching total outage or standby drops by load resistance, when falling to a certain degree, and in the time of in during vertical blanking impulse, make triode A81 positively biased conducting output high level, make picture tube three rifle R, G, B conducting, obtain field flyback and shield the discharge effect that leaks.Discharge scheme only keeps the spot suppressor duration less than about 1 millisecond because field flyback screen of the present invention leaks, so will turn-off the horizontal pulse of line scanning pre-driver by collector load current-limiting resistance R84 branch road X in conducting picture tube three rifles.Described shutoff line scanning pre-driver horizontal pulse scheme can directly be turn-offed the row vibration or be connected in row promotion pipe input (base stage) by control valve V3 collector electrode by integrated package inside " X " radiation protection, turn-offs row and promotes to manage.Excessive in order to prevent the outer beam electronic current of releasing of field flyback screen, the shortcoming excessive to the impact of element, collector electrode will be put pipe chain picture tube three rifle R, G, B conducting by looking by first, second and third diode D82, D83, D84 control respectively behind the serial connection current-limiting resistance R84 again during design triode A81 conducting, thereby can limit beam electronic current about 1 milliampere.Can realize switching on and shutting down protecting against shock sound function by anodal diode D88 branch road control quiet (MU) circuit that connects triode A81 collector electrode in addition.
After total outage or standby, triode A81 conducting is laggard goes into grating contraction state gradually, referring to Figure 14 and Figure 15 (or Figure 20 example): come from switching mode power supply transformer secondary commutation filter circuit capacitor C 4 or C62 behind series amplification rheostatic voltage stabilizer adjuster VH or AH by getting, again by anti-return diode VH9 rectification, behind the large bulk capacitance CHV energy storage, again behind step-down current-limiting resistance RH9, as row oscillation power H.VCC.Because capacitor C HV capacity is big, it is little to load, even the about half of drop after shutdown of main load terminal voltage or the standby still can produce the output of row energization signal by normal power supply, keeps grating and can enter contraction state gradually, Zong eliminate shutdown or standby speck bad phenomenon.
The innovation complete machine any rectification filtering circuits at different levels all adopt the soft start scheme that the surge overcurrent impacts of opening of cutting down.Can effectively prevent rectifying tube breakdown potential container failure of removal.And double electronic filtering effect, reduce capacitance.
At first surely control [Figure 10 or Figure 11 example] in the regulating circuit (ASE) in the switching power supply direct sample.Increase and be parallel to voltage-reference diode W3 two ends soft start capacitor C32, be that starting up or standby are when transferring operate as normal to, delaying main steady magnitude of voltage is raised to the operate as normal stable state and should needs the magnitude of voltage time by low voltage value is slow, just can alleviate each output rectification filtering circuit of switching power supply and open the harm of surge impact overcurrent, and offset except that the switching on and shutting down impulsive sound favourable.Capacitor C 32 voltages during shutdown can pass through diode D14, direct sample resistance R 2, R10, the repid discharge of R22 branch road.Voltage-stabiliser tube W3 can use [Figure 20 example] by one or two voltage-stabiliser tube series aiding connection.Diode D323 branch road can connect on two voltage-stabiliser tube W3 series connection interface points.
Because the small signal system power supply generally all is to power through series amplification rheostatic voltage stabilizer, start the harm of impact overcurrent and reduce power consumption in order to alleviate each output of various series amplification rheostatic voltage stabilizers, adopt Figure 14 exemplary scenario, respectively at various pressurizer voltage-reference diode W51, W12, W54, W9A two ends soft start control capacitance in parallel C51, C110, C54 not only prolongs the voltage stabilizing output voltage by the slow steady-state value process that is raised to of low value, and double electronic filter effect, alleviate back level filter capacitor capacity, alleviate voltage stabilizing and adjust the harm of tube loop unlatching surge impact overcurrent.In order to reduce the series amplification rheostatic voltage stabilizer power consumption, just must reducing each series connection amplifies to adjust to manage to collect and penetrates main branch voltage and fall, series connection amplify to be adjusted the pipe collector loop and is got and come from the low voltage power supply source as capacitor C 4, C22, C21, and double above higher voltage power supply is adopted in the base bias loop, as capacitor C 62, and C64 etc.Crosstalk in order to alleviate the TV/AV switching, high intercarrier signal system is separated power supply with video decode, controlling high intercarrier signal system power supply (5V-4) on/off by control valve V54, it is good that power supply can adopt field effect transistor for micro controller CPU or row oscillation power adjustment pipe A5-1, VH, AH.Tandem tap power supply colour TV, line oscillation of power supply source only can be got and come from switch power supply secondary, can not be with the secondary implication of kickback transformer.To come from the secondary power supply of kickback transformer be main and other small-signals are got as far as possible.Powerful audio power amplifier and field output stage are got and come from switch power supply secondary is good.(among Figure 14, can connect by diode D59 branch road and exchange complete closedown relay tube collector electrode VKC.Realize overvoltage shutdown ACOFF by voltage-stabiliser tube W4 branch road.When exchanging the complete closedown device action, must turn-off micro controller CPU power supply) by diode UP branch road.
In order to realize that the user both can be easy to use energy-conservation, need not frequent standby again as far as possible, the present invention increases: pause function.Can listen television acoustics separately, the soft start horizontal output stage of holding concurrently power supply prolongs picture tube benefit in useful life.With usual standby, " screen protection ", " listen " the function difference separately: standby in the past all will at first be cut off line scanning, when the present invention suspends, line scanning is still in work, should the value of need but must the steady magnitude of voltage of control switching master fall to automatically, guarantee that horizontal output stage superhigh pressure is that 0 blank screen state ratio drops on the contrary when image is arranged and is the low voltage phenomenon at the picture tube line, alleviates the superhigh pressure moisture absorption and causes the high voltage arc fault.When entering the innovation pause function, sequential is: after screen apparent " no signal or pressure blank screen economize on electricity noise elimination " character shows earlier, force blank screen indicator light HL3 bright again, turn-off Video Decoder, video amplifier circuit and field output stage circuit, the steady voltage of Switching Power Supply master is fallen to automatically should the value of need.When transferring operate as normal to, by software or monostable impulse circuit [Fig. 3 or Fig. 4, Fig. 7, Fig. 8 example], still continue earlier to keep and turn-off the CRT beam electronic current for a moment, make the main steady magnitude of voltage in original drop back slow gradually liter of being expert at behind the scanning work recover operate as normal and should need after the voltage stabilizing value for a moment, allow after the abundant preheating of picture tube CRT filament, CRT is entered normally should the grating state, reaches energy-conservation and prolongation CRT life-span benefit.Physical circuit is referring to (by Fig. 3, Figure 10 or Figure 11 are after Figure 14 combination) Figure 15 example or Figure 20 example.(can turn-off field-scanning circuit by diode Dpe branch road Jdv among this figure.Resistance R 84 branch roads can be connected in series voltage-stabiliser tube).
Figure 20 example: contain [Figure 10] and suspend the main steady magnitude of voltage circuit of control, quiet double spot suppressor of [Fig. 3] ON/OFF and the picture tube filament pre-heating circuit of lengthening the life, [Figure 16, Figure 17, Figure 18, Figure 19] optocoupler-metal-oxide-semiconductor pincushion correction circuitry constitutional diagram.(it is as follows to explain in detail):
Employing contains the colour TV of tandem tap power supply, more helps total shutdown and enters grating contraction state gradually.[Figure 10 example]: compare in the regulating circuit the steady magnitude of voltage of master when increasing in the operate as normal direct sample by triode Ape and optocoupler N3 control operate as normal.Triode Ape and optocoupler N3 are inoperative during operate as normal, keep normal main steady voltage output.Standby or when suspending, or the row oscillation power maintains halted state when not building up without exception, makes main steady voltage falling lower voltage value or holding state.Figure 10 circuit optocoupler N3 and triode Ape can save, by optocoupler-metal-oxide-semiconductor pincushion correction circuitry compatibility, referring to Figure 20 example.[Figure 11 example] is fit to pressure swing type Switching Power Supply occasion, during time-out, by the conducting of D323 branch road, makes main steady voltage falling the value of need enter halted state, and diode D323 negative terminal can connect [Figure 15 or Figure 20 example] triode Vpe collector electrode or capacitor C 9 positive poles.By the conducting of voltage-stabiliser tube W8 branch road, enter holding state during standby.
Figure 20 example is adapted at specifically utilization in the cold start system with serial switching power supply for colour TV set most; because tandem tap power supply master output belongs to input loop some; must be in electrical network and involve the hot movement that Danger Electric shock risk is arranged; can omit Figure 10 exemplary circuit; direct sample terminal voltage value when but dual-purpose is directly regulated operate as normal by the optocoupler pincushion correction circuitry; no signal automatic pause or have signal to force the blank screen noise elimination; micro controller CPU output pause instruction Pe high potential; make control valve Vpe conducting; FBT level of source kickback transformer got in shutoff; behind series amplification rheostatic voltage stabilizer adjustment pipe A9-1; capacitor C 9 voltage fallings; make the amplifier tube A72 conducting and the chain conducting of inverter A83 thereof of original shutoff, by diode D85; D86; D87 shutoff video amplifier circuit and CRT three rifles are in blank screen is not had the line state.When previewing is put after grade capacitor C 9 put electricity, then the optocoupler pincushion correction circuitry is by optocoupler N2 input no current, make former the getting of optocoupler N2 output feeder ear Cam come from tandem tap power supply master output capacitor C, after vacation connects load resistance R321 and R322 dividing potential drop, forming power supply (capacitor C 18) voltage raises gradually, when capacitor C 18 magnitude of voltage rising certain values, can puncture the voltage-stabiliser tube W32 branch road that normality is turn-offed, meet load divider resistance R321 and R322 by vacation, pressure-gradient control valve falls to main steady magnitude of voltage and should need to suspend voltage for the steady control circuit of former direct sample.When transferring operate as normal to after time-out or the standby, because pipe A9-1 base stage access soft start capacitor C9A capacity is adjusted in series connection and charge constant is very big.After making voltage stabilizing, capacitor C 9 rises slowly after diode D9 rectification.Preposition triode A72 and rearmounted triode A83 constitute special-shaped multiple tube, constitute the positive feedback role of network by increasing capacitor C 76 resistance R 76 timing elements between preposition triode A72 base stage and the back utmost point triode A83 base stage (or collector electrode), make triode A83, A72 have monostable impulse circuit character, as picture tube filament preheating circuit (2).Starting up or time-out or holding state are forced to be the blank screen state by three diode D85, D86, D87 shutoff picture tube R, G, B three rifle beam electronic currents before just having transferred operate as normal to without exception; after making the abundant preheating of picture tube filament normal; could remove above-mentioned monostable impulse circuit and turn-off the picture tube function; make picture tube enter the grating normal operating conditions, voltage-stabiliser tube WP has overvoltage white peak inhibitory action.
Because the innovation combined switch power supply is unusual, adopts dual steady control loop, can stops arbitrary element interruption or generation overvoltage out of control and export chain big damage phenomenon.Coupling or magnetic coupling intermediary advantage because the innovation work and standby commutation circuit need not to add lustre to after line scanning quits work, just can make Switching Power Supply enter control voltage stabilizing state between preferential standby.So, set up monostable standby mode more.In order to make standby moment, line scanning continuous firing moment enters grating contraction state gradually, during standby, turn-off row vibration series amplification rheostatic voltage stabilizer by control valve VH1, enter the saturation conduction state by the chain pillow school optocoupler N2 that makes of diode VH12 again simultaneously, make capacitor C 18 current potentials fall to diode D323 fast and transfer conducting to, make the of short duration drop gradually of main steady voltage, till row oscillation power CHV and previewing discharge source C9 drop end pillow school optocoupler N2 by the anti-Pianguan County of normality is disconnected.Diode VPe2 can remove.
Because the present invention increases pause function is arranged, can make halted state the horizontal output stage voltage supplied (+B) drop is lower, when transferring operate as normal to by standby or starting up, the line scanning prime preferentially enters normally should need on off state.Because kickback transformer FBT secondary capacitance C21 and the chain previewing discharge source of soft start capacitor C9A C9, reason standby 0 magnitude of voltage rising steady state voltage value is slow, elongates optocoupler N2 cut-off state and is controlling continuous the holding the time of leading steady magnitude of voltage low voltage process.That is, after the line scanning prime operate as normal, and in during the CRT filament pre-heating, make main steady horizontal output stage (H.OUT) voltage supplied just arrive the operate as normal steady-state value for a long time by slow liter of low value.[relevant starting up, work/standby (DCON/OFF), suspend (Pe), capable the promotions level of row oscillator stage power supply source H.VCC and bootstrapped switch boost type power supply source 5V (CPU), row energization pulse Hpp exports and line output H.OUT feeder ear (+B) timing waveform is referring to Figure 32 example].As seen, when standby transfers operate as normal to, by way of suspending the main steady voltage build-up rate process of (Pe) function control.The innovation pause function soft start horizontal output stage voltage supplied function of holding concurrently is very superior, thus chain raising complete machine and picture tube reliability.Also help and slow down machine open/close moment electromagnetic induction and high potential assembly (particularly electrostatic induction) harm.The innovation no signal automatic pause is about half of existing colour TV " screen protection " or quiescent dissipation owing to turn-off decoded field scanning and sound accompaniment function etc., and energy-saving effect is remarkable.
,, the previewing source is entered just be in the white raster state when standby makes DOFF without exception according to the solution of the present invention as detection resources according to integrated package previewing discharge source voltage height, when previewing discharge source voltage falling certain value, the automatic blank screen of another rule does not have the line state.Can related parameter be arranged with software adjustment.The innovation overcome the prior art standby start shooting filament again can not the preheating shortcoming.
The innovation optocoupler metal-oxide-semiconductor pincushion correction circuitry [Figure 19 or Figure 20 example], pillow school front end circuit output parabolic shape EW is by amplifier tube, and (or removal) is connected in control correction tube AM eventually behind optocoupler N2 again.The pillow whole keyholed back plate AM drain D in school (or collector electrode) can take over how to rest the head on school Terminal Capacitance hot end, and the pillow whole keyholed back plate AM source S in school (or emitter) can take over how to rest the head on school electric capacity cold end.What (series connection) Switching Power Supply master output capacitor C optocoupler N2 output feeder ear Cam can take on resistance R 321, R322 dividing potential drop node among this figure.Apply to remove optocoupler N2 under the pressure swing type Switching Power Supply occasion, directly can connect pillow pipe AM input G eventually by resistance R 5G by amplifier tube Ap or An collector electrode (or removing amplifier tube).The innovation is succinctly reliable, serves many purposes, the stable row of cold and hot isolation intermediary and fast temperature compensation width of cloth effect.Wherein, optocoupler N2 magnifying state is exclusively used in the pillow school isolates, and the special-purpose pause function of optocoupler N2 cut-off state is regulated main steady magnitude of voltage drop should the value of need.The special-purpose standby moment line scanning continuous firing just of optocoupler saturation conduction state moment makes the of short duration drop gradually of main steady voltage a moment, enters grating contraction state gradually.
As follows for optocoupler of the present invention-metal-oxide-semiconductor pincushion correction circuitry (how) versatility special explanation: [Figure 19 or Figure 20 example] photoelectrical coupler N2 can choose 4 ends or 6 ends (band feedback exit) portion's product wantonly, can use mutually in same printing board PCB.In Figure 19 or Figure 20 example, by after " 4 " item connects among selection light J21, J22, the J23, specially be used in 4 end optocouplers respectively, connect the back circuit as shown in figure 16.If select " 6 " item to connect, specially join 6 end optocouplers.According to parabolic shape EW signal source difference, if optocoupler N2 input is respectively by selecting " II " among light J27, J28, the J29 to connect, and and after the elements combination such as NPN triode AN, be applicable to that preposition is " the bottom of a pan " upwards parabolic shape EW II signal [Figure 16 example].If after passing through resistance R e4 branch road and light J29III being connected, can need not preposition amplifier tube AN[Figure 18 example].Optocoupler N2 input is if connect by " I " among light J27, J28, the J29 respectively, and and elements combination such as PNP triode AP after, be applicable to that preposition is " the bottom of a pan " parabolic shape EW I signal [Figure 17 example] downwards.Optocoupler output feeder ear Cam can take over a power supply, and main output capacitor C two ends vacation meets load divider resistance R321 and R322 junction capacitor C 12 is good applicable to tandem tap power supply occasion among this figure.[Figure 16 example] resistance R e6, Re7 and [Figure 17 example] resistance R e3, Re2 mainly regulate the capable width of cloth, the whole keyholed back plate AM of voltage negative feedback resistor R8D in parallel scalable MOS amplification quantity.Therefore, mainly be to regulate pillow school amount.[Figure 16 or Figure 17 example] electric current series connection negative feedback resistor Re8 or Re1 cooperate partial pressure type biasing resistor Re6, Re7 or resistance R e3, Re2 to have stabilized current characteristic respectively, the main row width of cloth and the pillow school amount of regulating.The innovation optocoupler pincushion correction circuitry has constant-current driving, dynamic suspension, excellent transmission alternating current-direct current component proportion pass, particularly fast temperature compensation, make start shooting very little to the capable amplitude variationization of steady-state process, pillow school amount and line width adjusting are implicative of each other little, to advantages such as colour TV pipe arrangement and the various parameter variable effects of horizontal output stage are little.Be convenient to produce to simplify debugging, also can make arbitrary colour TV factory set parameter level off to intermediate value.Whole keyholed back plate AM can be field effect transistor or triode.

Claims (10)

1. a video equipment shutdown delay circuit is characterized in that: comprise input power circuit (3), continued access power circuit (4), voltage comparator circuit (5); Described input power circuit (3), continued access power circuit (4) input are connected with video equipment internal transformer secondary output end, be used for when the video equipment general supply is cut off the power supply or entered holding state, being respectively described voltage comparator circuit (5) reference voltage, comparative voltage being provided;
The reference voltage input terminal of described voltage comparator circuit (5) is connected with described input power circuit (3) output, the comparative voltage input of described voltage comparator circuit (5) is connected with described continued access power circuit (4) output, and the output of described voltage comparator circuit (5) is connected with the tube cathode of video equipment; When the video equipment general supply is cut off the power supply or is entered holding state, when described comparative voltage is higher than reference voltage, described voltage comparator circuit (5) keeps conducting state, and the electric current that described continued access power circuit (4) is discharged imposes on the video equipment tube cathode, and the picture tube grating is progressively shunk.
2. video equipment shutdown delay circuit as claimed in claim 1, it is characterized in that: also comprise control circuit (9), be connected between the reference voltage input terminal and described input power circuit (3) of described voltage comparator circuit (5), be used for when the video equipment operate as normal, control voltage comparator circuit (5) is in cut-off state, after total outage or standby, when power supply drops to a certain degree and again during vertical blanking impulse the time, control voltage comparator circuit (5) is in conducting state.
3. video equipment shutdown delay circuit as claimed in claim 1 or 2, it is characterized in that: described input power circuit (3) comprises main charge-discharge circuit, be connected between video equipment internal transformer secondary output end and the ground, be used for when the video equipment operate as normal, charge, when the video equipment general supply is cut off the power supply or entered holding state, a reference voltage is provided for described voltage comparator circuit (5).
4. video equipment shutdown delay circuit as claimed in claim 1 or 2, it is characterized in that: described continued access power circuit (4) comprises time delay discharge circuit, be connected between video equipment internal transformer secondary output end and the ground, be used for when the video equipment operate as normal, charge, when the video equipment general supply is cut off the power supply or entered holding state, a comparative voltage is provided for described voltage comparator circuit (5).
5. video equipment shutdown delay circuit as claimed in claim 3, it is characterized in that: described main charge-discharge circuit comprises main charge and discharge capacitance (C21), its anode is connected minus earth with video equipment internal transformer secondary output end.
6. video equipment shutdown delay circuit as claimed in claim 4, it is characterized in that: described time delay discharge circuit comprises charge and discharge capacitance (C81), rectifier diode (D81), the anode of described rectifier diode (D81) is connected with video equipment internal transformer secondary output end, negative electrode is connected with described charge and discharge capacitance (C81) anode, described electric capacity (C81) minus earth.
7. as claim 5 or 6 described video equipment shutdown delay circuits, it is characterized in that: described voltage comparator circuit (5) comprises switch triode (A81), its base stage is connected with the anode of described main charge and discharge capacitance (C21), emitter-base bandgap grading is connected with the anode of described charge and discharge capacitance (C81), collector electrode is as the switching signal output, and the electric current that described charge and discharge capacitance (C81) is discharged outputs to tube cathode.
8. described video equipment shutdown delay circuit as claimed in claim 7, it is characterized in that: described control circuit (9) comprise clamp diode (V44) and with the biasing resistor (R822) of the capacitors of clamp diode (V44) connection, clock (V.BLK), the anode of described clamp diode (V44) connects the anode of main charge and discharge capacitance (C21), negative electrode is connected the base stage of switch triode (A81) with the interface point of biasing resistor (R822), the other end of biasing resistor (R822) connects to make makes the clock (V.BLK) of switch triode (A81) in the field blanking interval conducting under total outage or the holding state.
9. video equipment shutdown delay circuit as claimed in claim 8, it is characterized in that: described voltage comparator circuit (5) also comprises the collector load branch road, comprise load resistance (R84), or the series arm of load resistance (R84) and first, second and third voltage-stabiliser tube (D82-D84) parallel branch, described branch road is serially connected with between the collector electrode and tube cathode of described switch triode (A81).
10. as each described video equipment shutdown delay circuit in the claim 1,2,9, it is characterized in that: also comprise power on and power off muffling branch road (8), cross-over connection is between described voltage comparator circuit (5) output and squelch switch circuit exit; Audio frequency impact signal when being used to eliminate switching on and shutting down.
CNB2004100153037A 2004-02-06 2004-02-06 Turning-off delay circuit for video apparatus Expired - Fee Related CN100393117C (en)

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CN101753927B (en) * 2008-12-22 2012-03-21 康佳集团股份有限公司 Delayed switching circuit and control method thereof
CN103532536B (en) * 2012-07-04 2016-04-20 福建巨力电子装备工业有限公司 The power on-off control circuit of vehicle electronic device
CN108092654A (en) * 2017-12-27 2018-05-29 山东汉旗科技有限公司 A kind of DC load timing shutdown circuit
CN113141105A (en) * 2021-04-25 2021-07-20 深圳市优优绿能电气有限公司 Output protection method and device of rectifier module

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US4723167A (en) * 1987-02-24 1988-02-02 Zenith Electronics Corporation Turn-off circuit for projection television CRT
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