CN101790269A - LED power supply with no-load and light-load protection output and capable of receiving phase-cut dimming stably - Google Patents
LED power supply with no-load and light-load protection output and capable of receiving phase-cut dimming stably Download PDFInfo
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Abstract
The invention discloses an LED power supply with no-load and light-load protection output and capable of receiving phase-cut dimming stably, which comprises a balancing resistor, a high-voltage dimming signal detecting circuit, a capacitor array with controlled volume, a system power supply, a low-voltage dimming signal detecting circuit, a voltage-PWM conversion circuit, an output overvoltage and undervoltage protection circuit, a voltage or PMW dimming constant-current source, and a capacitor array output control circuit, wherein the capacitor array with the controlled volume is controlled by the capacitor array output control circuit to match the balancing resistor consisting of NTC thermistors, so that the power of the power supply forms a certain direct proportion relation with filtering capacitance; a phase-cut dimmer is in a good phase-cut state, and a dimming signal is generated by the dimming signal detecting circuits to control an LED constant-current source so as to realize the LED dimming of the LED power supply; and the overvoltage and undervoltage protection circuit is set at the output of a constant-current power supply, so that LED hot plug and no-load and light-load protection are realized. Therefore, the LED power supply has great application prospects in the aspect of LED dimming.
Description
Affiliated technical field
The present invention relates to a kind of phase-cut dimming power supply, more specifically, but particularly a kind of output device has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably.
Background technology
At present, receiving phase-cut dimming generally be the incandescent lamp or the Halogen lamp LED of the high-power high thermal resistance of Alternating Current Power Supply, be that a kind of luminous element load (as incandescent bulb) does not have the phase-cut dimming of direct series connection in the output of phase-cut dimming device through oversampling circuit control, during light modulation, because their the big high thermal resistance of power so the light modulation dimension is good, can realize the light modulation of 0-100%, and therefore not flicker has obtained using widely.Yet along with science and technology is growing, a kind of low-power consumption long-life energy-saving LED illumination has occurred, and applies in that every field is large-area.But, because LED belongs to nonlinear semiconductor light-emitting-diode, it is a kind of light source that can only accept constant current control, be essentially different with traditional control as incandescent lamp, and the Vf voltage of a general LEDs is about 3V, owing to be constant current control, generally is series connection control when design, thereby, can not as traditional incandescent lamp, directly be connected on LED on the output line of phase-cut dimming.Therefore; in today of wideling popularize the LED energy-saving application; just cut and need to compel a kind of phase-cut dimming and output of realization constant current of stablizing on acceptance and the compatible traditional circuit, can hot-swappable and effectively protect the unlikely LED power supply that under this light modulation, burns out of LED, with the popularization and the use of cooperated with LED.
In modern times illuminations, in the control of the phase-cut dimming output, general before phase-cut dimming be controllable silicon dimmer, back phase-cut dimming be the transistor dimmer.Because LED illumination is low-voltage direct current supply, so individual AC-DC converting power source must be arranged, it is luminous to obtain passing through behind the direct current constant-current source driving LED again, if LED has dimming function, a light modulation line must be arranged, with the control with this root light modulation termination modulated optical information.Power to LED again when how in the control system of the phase-cut dimming that has only two output lines, to take out the light modulation information of same? American TI Company, NS company and Holland fly Li Pu company and have released SN0901026 respectively, LM3445, the SSL2101 chip has been realized the preceding cut LED light modulation of silicon controlled; The patent No. is 200820213150.0 also to have realized the light modulation of LED.But it is little that said method all exists power, and power-efficient low (efficient is all below 80%), the particularly patent No. are in 200820213150.0 the method, also to have added the resistance dummy load on power supply, and efficient is just lower; The light modulation angle exists tangible scintillation when low; When crossing EMI and EMC, exist a lot of insurmountable problems.Simultaneously, because in the foregoing circuit, when constant-current source was unloaded, output voltage was very high, does not design the protection of LED zero load or underloading, under hot-swappable situation, is very easy to burn out LED.Thereby such scheme is bad applying on the LED brightness adjustment control.
Summary of the invention
The object of the present invention is to provide a kind of output device that but the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably is arranged; go to control the electric capacity battle array of controlled capacity by electric capacity battle array output control circuit; the balance resistance that cooperation is made up of the NTC thermistor; make power and the certain proportional relationship of filtered electrical Rongcheng; allow the phase-cut dimming device enter intact cut state; by the dim signal testing circuit; produce dim signal and remove to control the LED constant-current source; realize the LED light modulation of the wide dimming scope of LED power supply high stability high efficiency; constant-current supply output is provided with the over-and under-voltage testing circuit, realizes the hot-swappable and unloaded underloading protection of LED.
Technical scheme of the present invention is:
But described a kind of output device has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it comprises: the phase dimmer (2) of being sure to, balance resistance (3), high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6), low pressure dim signal testing circuit (7), voltage-PWM change-over circuit is (8) 1., output overvoltage under-voltage protecting circuit (9), and voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), and voltage-PWM change-over circuit is (15) 2.;
Wherein:
(1), described voltage--PWM change-over circuit 1. (8) and output overvoltage under-voltage protecting circuit (9) can merge composition voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10),
At (one) described voltage-PWM conversion and output overvoltage under-voltage protecting circuit, included MCU U2 ATtiny13 receives low pressure dim signal testing circuit and voltage or PWM light modulation constant-current source and sends next information voltage to, and carries out the AD conversion and handle accordingly sending PWM dim signal and over-and under-voltage protection control signal according to being solidificated in its inner software;
(2), described electric capacity battle array output control circuit (14) and voltage--PWM change-over circuit 2. (15) can merge and forms electric capacity battle array output control and voltage-PWM change-over circuit (16),
At (two) described electric capacity battle array output control and voltage-PWM change-over circuit, included MCU U3 ATtiny13 receives high pressure dim signal testing circuit and sends next information voltage to, and MCU U3 ATtiny13 carries out the AD conversion and handle accordingly sending PWM dim signal and electric capacity battle array output control signal according to being solidificated in its inner software;
Its annexation: electric main input (1) is connected with balance resistance (3) through phase-cut dimming device (2) output, balance resistance (3) output respectively with high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6) connects, the detected dim signal of high pressure dim signal testing circuit (4) send voltage-PWM change-over circuit 2. (15) and electric capacity battle array output control circuit (14) respectively, voltage-PWM change-over circuit 2. PWM the dim signal of (15) output send voltage or PWM light modulation constant-current source 3. (13), electric capacity battle array output control circuit (14) output links to each other with the electric capacity battle array (5) of controlled capacity, system power supply (6) is given voltage-PWM change-over circuit 1. (8) respectively, output overvoltage under-voltage protecting circuit (9), voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), voltage-PWM change-over circuit is (15) power supply 2., the dim signal of isolating the output taking-up to system power supply (6) leads to low pressure dim signal testing circuit (7), low pressure dim signal testing circuit (7) output dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11) respectively, voltage-PWM change-over circuit is (8) 1., voltage-PWM change-over circuit 1. PWM the dim signal of (8) output send voltage or PWM light modulation constant-current source 2. (12), voltage or PWM light modulation constant-current source 1. the LED+ end of (11) link to each other with output overvoltage under-voltage protecting circuit (9), and output overvoltage under-voltage protecting circuit (9) output feedback is connected on the system power supply (6);
Controlled step is:
(a), the proportional voltage one tunnel of the cut voltage with input that high pressure dim signal testing circuit detects is given electric capacity battle array output control circuit, electric capacity battle array output control circuit is according to the situation of cut, go to control the electric capacity battle array of controlled capacity, the size of the electric capacity battle array capacitance of controlled capacity is directly proportional with the size of bearing power, and cooperate with balance resistance, and then realize making the phase-cut dimming device enter the intact light modulation cut state and the control of power supply high power factor, another road voltage send that voltage-the PWM change-over circuit 2., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 3. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then realizes the PWM light modulation of LED;
(b), isolating output from system power supply low pressure takes out the light modulation information that is proportional to the phase-cut dimming voltage duty cycle and send through the detected voltage one tunnel of low pressure dim signal testing circuit that voltage-the PWM change-over circuit 1., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 2. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then the PWM light modulation of realization LED, voltage or PWM light modulation constant-current source are sent in another road 1., 1. voltage or PWM light modulation constant-current source go driving LED according to the electric current that this voltage output is proportional to cut voltage, and then realize the voltage light modulation of LED;
(c), take out voltage, deliver to the output overvoltage under-voltage protecting circuit, the output overvoltage under-voltage protecting circuit feeds back to system power supply according to setting, and the operating voltage of power supply control chip is locked, realizes the protection to LED from any one group of constant-current source output.
The electric capacity battle array (5) of described controlled capacity comprises field effect transistor Q1～Q4, capacitor C 3～C5, resistance R 8～R9.
Described low pressure dim signal testing circuit (7) comprises resistance R 25～R27, capacitor C 16～C17, voltage stabilizing didoe ZD3～ZD4, diode D6;
Diode D6 draws dim signal from the positive pole of the rectifier diode D5 of main power source, diode D6 and capacitor C 17 are formed detecting circuit, detect the light modulation information that becomes certain relation with the duty ratio of phase-cut dimming voltage, light modulation information one tunnel is composed in series non-linear sample circuit through resistance R 26 with voltage stabilizing two utmost point ZD4, another road light modulation information is through resistance R 25 current limlitings, converge during two-way light modulation information of same and enter voltage stabilizing by voltage stabilizing didoe ZD3, resistance R 27 dividing potential drops, capacitor C 16 filtering obtain the dimmer voltage of 0.5V～2.5V, 0.5V the dimmer voltage one tunnel of～2.5V is sent voltage-PWM change-over circuit 1. (8), voltage-PWM change-over circuit 1. (8) output PWM dim signal send voltage or PWM light modulation constant-current source 2. (12); Another road dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11), realizes voltage light modulation and the PWM light modulation of LED.
Described voltage or PWM light modulation constant-current source be (11) 1., comprise resistance R 54, capacitor C 21, inductance L 2, diode D13, LED D15 and the constant-current driven chip IC15 PAM2862 that can accept voltage light modulation or PWM light modulation.
Described system power supply (6) comprises isolating diode D2, power supply control chip IC3 FAN7527, and power supply control chip IC3 also can be L6561, L6562, NCP1606, TDA4863, FAN7530.
Described balance resistance (3) comprises resistance NTC1, NTC2, and the value of resistance NTC1, NTC2 is between 5～300 ohm.
Described electric capacity battle array output control circuit (14) comprises resistance R 1～R4, R31～R35, four high guaily unit LM324, three-terminal voltage-stabilizing IC5LM7805.
Described output overvoltage under-voltage protecting circuit (9) comprises resistance R 37～R46, capacitor C 18, controllable silicon Q6, optocoupler IC9, the amplifier IC10 TL103 of diode D8～D9 and the accurate voltage comparator of tape base;
Resistance R 45, R46 are that overvoltage detects resistance; resistance R 43, R44 are under-voltage detection resistance; the VCC end pin 8 of the anode welding system power supply control chip FAN7527 of controllable silicon Q6; minus earth; the resistance R 37, the capacitor C 18 that connect the control utmost point are connected to ground, and R38 is to the IC9 optocoupler, and under-voltage, overvoltage control signal is sent from pin 1, the pin 7 of TL103 respectively; when controllable silicon Q6 receives the over-and under-voltage guard signal VCC of FAN7527 end pin 8 moved to it is locked, realize the over-and under-voltage protection.
Described voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10), the control program that is solidificated in MCU U2 ATtiny13 comprises: A/D trace routine module (17), primary control program module (18), Output Control Program module (19);
A/D trace routine module (17) is connected with primary control program module (18), and primary control program module (18) is led to Output Control Program module (19).
Described electric capacity battle array output control and voltage-PWM change-over circuit (16), the control program that is solidificated in MCU U3 ATtiny13 comprises: A/D trace routine module (20), primary control program module (21), Output Control Program module (22), A/D detect data processor module (23), electric capacity battle array control output program module (24);
A/D trace routine module (20) links to each other with primary control program module (21), primary control program module (21) is led to Output Control Program module (22) respectively, A/D detects data processor module (23), and A/D detects data processor module (23) and leads to electric capacity battle array control output program module (24).
The effect of invention:
1, realized the light modulation of LED illumination on traditional light modulation circuit.
2, power-efficient height can be realized high-power design.
3, brightness adjustment control good linearity, low-light level is not glimmered.
Hot-swappable protection when 4, having solved the unloaded underloading of LED constant-current source.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is the light adjusting circuit schematic diagram of the present invention by analog circuit control.
Fig. 3 is the light adjusting circuit schematic diagram of MCU microprocessor control of the present invention.
Fig. 4 is that city of the present invention is solidificated in MCU U2A Ttiny13 control program module block diagram.
Fig. 5 is that city of the present invention is solidificated in MCU U3A Ttiny13 control program module block diagram.
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, it is schematic block circuit diagram of the present invention, it comprises: phase-cut dimming device (2), balance resistance (3), high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6), low pressure dim signal testing circuit (7), voltage-PWM change-over circuit is (8) 1., output overvoltage under-voltage protecting circuit (9), voltage or PWM light modulation constant-current source be (11) 1., and voltage or PWM light modulation constant-current source be (12) 2., and voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), voltage-PWM change-over circuit is (15) 2.;
Wherein:
(1), described voltage--PWM change-over circuit 1. (8) and output overvoltage under-voltage protecting circuit (9) can merge composition voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10),
At (one) described voltage-PWM conversion and output overvoltage under-voltage protecting circuit, included MCU U2 ATtiny13 receives low pressure dim signal testing circuit and voltage or PWM light modulation constant-current source and sends next information voltage to, and carries out the AD conversion and handle accordingly sending PWM dim signal and over-and under-voltage protection control signal according to being solidificated in its inner software;
(2), described electric capacity battle array output control circuit (14) and voltage--PWM change-over circuit 2. (15) can merge and forms electric capacity battle array output control and voltage-PWM change-over circuit (16),
At (two) described electric capacity battle array output control and voltage-PWM change-over circuit, included MCU U3 ATtiny13 receive high pressure dim signal testing circuit send to come information voltage, MCU U3 ATtiny13 carries out the AD conversion and handles accordingly sending PWM dim signal and electric capacity battle array output control signal according to being solidificated in its inner software;
Its annexation: electric main input (1) is connected with balance resistance (3) through phase-cut dimming device (2) output, balance resistance (3) output respectively with high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6) connects, the detected dim signal of high pressure dim signal testing circuit (4) send voltage-PWM change-over circuit 2. (15) and electric capacity battle array output control circuit (14) respectively, voltage-PWM change-over circuit 2. PWM the dim signal of (15) output send voltage or PWM light modulation constant-current source 3. (13), electric capacity battle array output control circuit (14) output links to each other with the electric capacity battle array (5) of controlled capacity, system power supply (6) is given voltage-PWM change-over circuit 1. (8) respectively, output overvoltage under-voltage protecting circuit (9), voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), voltage-PWM change-over circuit is (15) power supply 2., the dim signal of isolating the output taking-up to system power supply (6) leads to low pressure dim signal testing circuit (7), low pressure dim signal testing circuit (7) output dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11) respectively, voltage-PWM change-over circuit is (8) 1., voltage-PWM change-over circuit 1. PWM the dim signal of (8) output send voltage or PWM light modulation constant-current source 2. (12), voltage or PWM light modulation constant-current source 1. the LED+ end of (11) link to each other with output overvoltage under-voltage protecting circuit (9), and output overvoltage under-voltage protecting circuit (9) output feedback is connected on the system power supply (6);
Controlled step is:
(a), the proportional voltage one tunnel of the cut voltage with input that high pressure dim signal testing circuit detects is given electric capacity battle array output control circuit, electric capacity battle array output control circuit is according to the situation of cut, go to control the electric capacity battle array of controlled capacity, the size of the electric capacity battle array capacitance of controlled capacity is directly proportional with the size of bearing power, and cooperate with balance resistance, and then realize making the phase-cut dimming device enter the intact light modulation cut state and the control of power supply high power factor, another road voltage send that voltage-the PWM change-over circuit 2., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 3. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then realizes the PWM light modulation of LED;
(b), isolating output from system power supply low pressure takes out the light modulation information that is proportional to the phase-cut dimming voltage duty cycle and send through the detected voltage one tunnel of low pressure dim signal testing circuit that voltage-the PWM change-over circuit 1., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 2. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then the PWM light modulation of realization LED, voltage or PWM light modulation constant-current source are sent in another road 1., 1. voltage or PWM light modulation constant-current source go driving LED according to the electric current that this voltage output is proportional to cut voltage, and then realize the voltage light modulation of LED;
(c), take out voltage, deliver to the output overvoltage under-voltage protecting circuit, the output overvoltage under-voltage protecting circuit feeds back to system power supply according to setting, and the operating voltage of power supply control chip is locked, realizes the protection to LED from any one group of constant-current source output.
Fig. 2 is the light adjusting circuit schematic diagram of the present invention by analog circuit control.
As shown in the figure; it mainly comprises: phase-cut dimming device (2); balance resistance (3); high pressure dim signal testing circuit (4); the electric capacity battle array (5) of controlled capacity; system power supply (6); low pressure dim signal testing circuit (7); voltage-PWM change-over circuit is (8) 1., output overvoltage under-voltage protecting circuit (9), and voltage or PWM light modulation constant-current source be (11) 1.; voltage or PWM light modulation constant-current source be (12) 2.; voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), and voltage-PWM change-over circuit is (15) 2..
Among the figure, the dimmer voltage that phase-cut dimming device (2) is sent here enters balance resistance (3), the NTC1 of balance resistance (3), NTC2 value are between 5～300 ohm, be to realize bigger output power of power supply, it is more satisfactory that resistance NTC1, NTC2 get the thermistor of negative temperature characteristic, because when power increases, flow through NTC1, the increase of NTC2 electric current, so NTC1, NTC2 heating, and then the resistance value of NTC1, NTC2 is reduced, on the contrary increase.NTC1, NTC2 just keep a heat balance with power like this, make simultaneously the phase-cut dimming device particularly controllable silicon dimmer be in a normal cut state, played the effect of balanced voltage waveform, buffering, prepared for high pressure dim signal testing circuit (4) accurately detects dim signal.Because phase-cut dimming device particularly controllable silicon dimmer needs certain electric current to keep the ability normally, when the dimmer voltage of coming out from balance resistance (3) enters rectifier bridge BRIDGE1 after capacitor C 1 is done high-frequency ac filtering, because rectifier bridge BRIDGE1 is a nonlinear device, if power is low excessively, simultaneously, there is bigger filter capacitor to exist behind the rectifier bridge, Shu Chu voltage waveform will be lopsided so, high pressure dim signal testing circuit (4) can't normally detect dim signal, but, if there is not filter capacitor, can't cross EMI so, EMC, so the circuit after rectifier bridge BRIDGE1 rectification has been introduced the electric capacity battle array (5) of controlled capacity, the electric capacity battle array of described controlled capacity comprises: field effect transistor Q1～Q4, capacitor C 3～C5, resistance R 8～R9, when power is big, the Q1 conducting, capacitor C 3 effects, in like manner, capacitor C 4 is controlled by Q2, capacitor C 5 and resistance R 8, the R9 collocation is controlled by Q3, Q4 makes filter capacitor capacity after rectifier bridge BRIDGE1 rectification increase progressively power output in power supply.The electric capacity battle array (5) of controlled capacity is controlled by electric capacity battle array output control circuit (14), and cooperates with balance resistance (3), makes phase-cut dimming device (2) all be in normal cut state at any time.Because phase-cut dimming device (2) is under the normal cut state, forming in the high pressure dim signal testing circuit (4) by diode D1, resistance R 5～R7, voltage stabilizing didoe ZD1～ZD2, capacitor C 2, with the highly level and smooth non-linear voltage of output 0.5V～2.5V, non-linear voltage one tunnel send by resistance R 1～R4, R31～R35, four high guaily unit LM324, the electric capacity battle array output control circuit (14) that three-terminal voltage-stabilizing IC5LM7805 forms, electric capacity battle array output control circuit (14) non-linear voltage according to this send to the capacitance control signal for the electric capacity battle array (5) of controlled capacity.Because filter capacitor is controlled, system power supply is the power supply of PFC single-stage control model, so will improve the power factor (PF) of system power supply (7) greatly.Described system power supply (6) comprises isolating diode D2, power supply control chip IC3 FAN7527, and power supply control chip IC3 also can be PFC power supply chips such as L6561, L6562, NCP1606, TDA4863, FAN7530.Another road of non-linear voltage is sent by amplifier LM393, resistance R 28～R30, R56, R36, capacitor C 23, diode D7 form voltage--the PWM change-over circuit is (15) 2., voltage--the PWM change-over circuit 2. duty ratio of (15) output PWM dim signal increases progressively with 0.5V～2.5V voltage is corresponding, and this PWM dim signal is delivered to voltage or PWM light modulation constant-current source 3. (13) through resistance R 57, optocoupler IC11.Because when constant-current source when open circuit was just unloaded, output voltage was the highest, is the operating voltage of constant-current source basically.In design during constant-current source, for the impact to LED of the ripple current that reduces constant-current source, general output all is connected to filter capacitor, as C21.The operating voltage of supposing constant-current source is 24V, and the Vf of a white light LEDs is about 3.2V, and the LED tandem working has so:
7 of 3.2V/ ≈ of 24V ÷
Can drive 1～7 LEDs, give power supply electrifying when not connecting LED, power supply is unloaded, this moment, C21 was full of, just capacitor C 21 both end voltage are 24V, because LED is and is connected on the capacitor C 21, if connect 1～7 LEDs this moment, the LED ceiling voltage is 3.2V/ * 7=22.4V, because of LED is a nonlinear semiconductor, hot-swappable like this LED is impacted is very big, and the C21 capacity is big more, the number that connects LED Shaochong is more hit just greatly more, and the possibility that burns out LED is arranged; If the LED constant-current source of 24V power supply only drives a LED, Shu Chu voltage is 3.2V so, though constant-current source is controlled with the PWM technology, 3.2V is far away greatly from 24V, so the efficient of LED constant-current source is still very low.In existing electronic technology, some LED constant-current supply is not pass through the secondary constant-current driving LED, but directly drive, with optocoupler FEEDBACK CONTROL output current, on principle, this design, the voltage at LED two ends is proportional with the voltage of giving control constant current chip power supply, when the number that connects LED very few, or normally connect the LED of certain fair amount, but because of some reason has burnt out some (when most of high-power LEDs burn out, generally be short circuit), Shu Chu voltage just diminishes so, so just causes the voltage of chip power supply to the control power supply to hang down and can't normally start, as: startup-undertension close-start-undertension closes, and so just causes LED frequent scintillation to occur.LED constant-current supply power P=I (constant) * V, V determine with the LED number that by the Vf of LED is on duty so general LED power supply, the LED quantity that connects is many more, and power is big more, and above-mentioned scintillation in the LED Designs of constant current source, is named the underloading flicker.In order to solve the unloaded hot-swappable LED of burning out and light-load efficiency is low excessively, the underloading scintillation, introduce output overvoltage under-voltage protecting circuit technology here.At this, overvoltage be unloaded, under-voltage be the meaning of underloading.Output overvoltage under-voltage protecting circuit (9) among the figure comprises resistance R 37～R46, capacitor C 18, controllable silicon Q6, optocoupler IC9, the amplifier IC10TL103 of diode D8～D9 and the accurate voltage comparator of tape base; Resistance R 45; R46 is that overvoltage detects resistance; resistance R 43; R44 is under-voltage detection resistance; the VCC end pin 8 of the anode welding system power supply control chip FAN7527 of controllable silicon Q6; minus earth; connect the resistance R 37 of the control utmost point; capacitor C 18 is connected to ground; R38 is to the IC9 optocoupler; under-voltage; the overvoltage control signal is respectively from the pin 1 of TL103; pin 7 is sent; when controllable silicon Q6 receives the over-and under-voltage guard signal VCC of FAN7527 end pin 8 moved to it is locked; the protection of realization over-and under-voltage; the all circuit in locked back quit work, and have had only again reset power ability operate as normal.In the constant-current source of output, voltage or PWM light modulation constant-current source be (11) 1., comprise resistance R 54, capacitor C 21, inductance L 2, diode D13, LED D15 and the constant-current driven chip IC15 PAM2862 that can accept voltage light modulation or PWM light modulation.IC15 PAM2862 can accept the PWM light modulation, also can accept the voltage light modulation of 0.5V～2.5V simultaneously.In like manner, voltage or PWM light modulation constant-current source 2. (12), voltage or PWM light modulation constant-current source 3. (13) and voltage or PWM light modulation constant-current source 1. (11) be the same principle.Low pressure dim signal testing circuit (7) comprises resistance R 25～R27, capacitor C 16～C17, voltage stabilizing didoe ZD3～ZD4, diode D6; Diode D6 draws dim signal from the positive pole of the rectifier diode D5 of main power source, diode D6 and capacitor C 17 are formed detecting circuit, detect the light modulation information that becomes certain relation with the duty ratio of phase-cut dimming voltage, light modulation information one tunnel is composed in series non-linear sample circuit through resistance R 26 with voltage stabilizing two utmost point ZD4, another road light modulation information is through resistance R 25 current limlitings, converge during two-way light modulation information of same and enter voltage stabilizing by voltage stabilizing didoe ZD3, resistance R 27 dividing potential drops, capacitor C 16 filtering obtain the dimmer voltage of 0.5V～2.5V, 0.5V the dimmer voltage one tunnel of～2.5V is sent voltage-PWM change-over circuit 1. (8), voltage-PWM change-over circuit 1. (8) output PWM dim signal send voltage or PWM light modulation constant-current source 2. (12); Another road dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11), realizes voltage light modulation and the PWM light modulation of LED.From principle, voltage-PWM change-over circuit 2. (15) and voltage-PWM change-over circuit 1. (8) be same principle, high pressure dim signal testing circuit (4) is same principle with low pressure dim signal testing circuit (7).
Fig. 3 is the light adjusting circuit schematic diagram of MCU microprocessor control of the present invention.
As shown in the figure, it mainly comprises: phase-cut dimming device (2), balance resistance (3), high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6), low pressure dim signal testing circuit (7), voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10), voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., and voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control and voltage-PWM change-over circuit (16);
As we know from the figure, its work basic principle is identical with Fig. 2 substantially, and different is:
(1), the described voltage of Fig. 2--PWM change-over circuit 1. (8) and output overvoltage under-voltage protecting circuit (9) can merge composition voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10), promptly use a MCU U2 ATtiny13, in conjunction with the control program that is solidificated in the inside, voltage--the PWM change-over circuit is (8) and output overvoltage under-voltage protecting circuit (9) 1. in replacement, it comprises resistance R 37～R39, R41, R43～R44, voltage stabilizing IC14 LM7805 and single-chip microcomputer U2 ATtiny13, capacitor C 18, controllable silicon Q6, optocoupler IC9, diode D8; The MCU U2 ATtiny13 of voltage-PWM conversion and output overvoltage under-voltage protecting circuit receives low pressure dim signal testing circuit and voltage or PWM light modulation constant-current source and sends next information voltage to, and carries out the AD conversion and handle accordingly sending PWM dim signal and over-and under-voltage protection control signal according to being solidificated in its inner software;
(2), described described electric capacity battle array output control circuit of Fig. 2 (14) and voltage--PWM change-over circuit 2. (15) can merge the output control of composition electric capacity battle array and voltage-PWM change-over circuit (16), promptly use a MCU U3 ATtiny13, in conjunction with the control program that is solidificated in the inside, replace electric capacity battle array output control circuit (14) and voltage--the PWM change-over circuit is (15) 2., it comprises voltage stabilizing IC5LM7805, single-chip microcomputer U3 ATtiny13; MCU U3ATtiny13 in electric capacity battle array output control and the voltage-PWM change-over circuit receives high pressure dim signal testing circuit and sends next information voltage to, and carries out the AD conversion and handle accordingly sending PWM dim signal and electric capacity battle array output control signal according to being solidificated in its inner software.
Fig. 4 is that city of the present invention is solidificated in MCU U2 ATtiny13 control program module block diagram.
Described voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10), the control program that is solidificated in MCU U2 ATtiny13 comprises: A/D trace routine module (17), primary control program module (18), Output Control Program module (19);
A/D trace routine module (17) is connected with primary control program module (18), and primary control program module (18) is led to Output Control Program module (19).
Fig. 5 is that city of the present invention is solidificated in MCU U3 ATtiny13 control program module block diagram.
Described electric capacity battle array output control and voltage-PWM change-over circuit (16), the control program that is solidificated in MCU U3 ATtiny13 comprises: A/D trace routine module (20), primary control program module (21), Output Control Program module (22), A/D detect data processor module (23), electric capacity battle array control output program module (24);
A/D trace routine module (20) links to each other with primary control program module (21), primary control program module (21) is led to Output Control Program module (22) respectively, A/D detects data processor module (23), and A/D detects data processor module (23) and leads to electric capacity battle array control output program module (24).
Though the present invention describes with reference to the above embodiments; but only be the excellent example of explanation of the present invention; the technical staff of electronics aspect should understand and wherein can do each and change and revise and do not break away from the present invention in a broad sense, to the variation distortion of the above enforcement or revise the protection range that all will fall into claim of the present invention.
Claims (10)
1. but an output device has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it comprises: the phase dimmer (2) of being sure to, balance resistance (3), high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6), low pressure dim signal testing circuit (7), voltage-PWM change-over circuit is (8) 1., output overvoltage under-voltage protecting circuit (9), and voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), and voltage-PWM change-over circuit is (15) 2.;
Wherein:
(1), described voltage--PWM change-over circuit 1. (8) and output overvoltage under-voltage protecting circuit (9) can merge composition voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10),
At (one) described voltage-PWM conversion and output overvoltage under-voltage protecting circuit, included MCU U2 ATtiny13 receives low pressure dim signal testing circuit and voltage or PWM light modulation constant-current source and sends next information voltage to, and carries out the AD conversion and handle accordingly sending PWM dim signal and over-and under-voltage protection control signal according to being solidificated in its inner software;
(2), described electric capacity battle array output control circuit (14) and voltage--PWM change-over circuit 2. (15) can merge and forms electric capacity battle array output control and voltage-PWM change-over circuit (16),
At (two) described electric capacity battle array output control and voltage-PWM change-over circuit, included MCU U3 ATtiny13 receives high pressure dim signal testing circuit and sends next information voltage to, and MCU U3 ATtiny13 carries out the AD conversion and handle accordingly sending PWM dim signal and electric capacity battle array output control signal according to being solidificated in its inner software;
Its annexation: electric main input (1) is connected with balance resistance (3) through phase-cut dimming device (2) output, balance resistance (3) output respectively with high pressure dim signal testing circuit (4), the electric capacity battle array (5) of controlled capacity, system power supply (6) connects, the detected dim signal of high pressure dim signal testing circuit (4) send voltage-PWM change-over circuit 2. (15) and electric capacity battle array output control circuit (14) respectively, voltage-PWM change-over circuit 2. PWM the dim signal of (15) output send voltage or PWM light modulation constant-current source 3. (13), electric capacity battle array output control circuit (14) output links to each other with the electric capacity battle array (5) of controlled capacity, system power supply (6) is given voltage-PWM change-over circuit 1. (8) respectively, output overvoltage under-voltage protecting circuit (9), voltage or PWM light modulation constant-current source be (11) 1., voltage or PWM light modulation constant-current source be (12) 2., voltage or PWM light modulation constant-current source be (13) 3., electric capacity battle array output control circuit (14), voltage-PWM change-over circuit is (15) power supply 2., the dim signal of isolating the output taking-up to system power supply (6) leads to low pressure dim signal testing circuit (7), low pressure dim signal testing circuit (7) output dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11) respectively, voltage-PWM change-over circuit is (8) 1., voltage-PWM change-over circuit 1. PWM the dim signal of (8) output send voltage or PWM light modulation constant-current source 2. (12), voltage or PWM light modulation constant-current source 1. the LED+ end of (11) link to each other with output overvoltage under-voltage protecting circuit (9), and output overvoltage under-voltage protecting circuit (9) output feedback is connected on the system power supply (6);
Controlled step is:
(a), the proportional voltage one tunnel of the cut voltage with input that high pressure dim signal testing circuit detects is given electric capacity battle array output control circuit, electric capacity battle array output control circuit is according to the situation of cut, go to control the electric capacity battle array of controlled capacity, the size of the electric capacity battle array capacitance of controlled capacity is directly proportional with the size of bearing power, and cooperate with balance resistance, and then realize making the phase-cut dimming device enter the intact light modulation cut state and the control of power supply high power factor, another road voltage send that voltage-the PWM change-over circuit 2., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 3. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then realizes the PWM light modulation of LED;
(b), isolating output from system power supply low pressure takes out the light modulation information that is proportional to the phase-cut dimming voltage duty cycle and send through the detected voltage one tunnel of low pressure dim signal testing circuit that voltage-the PWM change-over circuit 1., this voltage is converted into the PWM dim signal proportional with cut voltage at this, 2. this PWM dim signal removes to control voltage or PWM light modulation constant-current source, and then the PWM light modulation of realization LED, voltage or PWM light modulation constant-current source are sent in another road 1., 1. voltage or PWM light modulation constant-current source go driving LED according to the electric current that this voltage output is proportional to cut voltage, and then realize the voltage light modulation of LED;
(c), take out voltage, deliver to the output overvoltage under-voltage protecting circuit, the output overvoltage under-voltage protecting circuit feeds back to system power supply according to setting, and the operating voltage of power supply control chip is locked, realizes the protection to LED from any one group of constant-current source output.
2. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
The electric capacity battle array (5) of described controlled capacity comprises field effect transistor Q1～Q4, capacitor C 3～C5, resistance R 8～R9.
3. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described low pressure dim signal testing circuit (7) comprises resistance R 25～R27, capacitor C 16～C17, voltage stabilizing didoe ZD3～ZD4, diode D6;
Diode D6 draws dim signal from the positive pole of the rectifier diode D5 of main power source, diode D6 and capacitor C 17 are formed detecting circuit, detect the light modulation information that becomes certain relation with the duty ratio of phase-cut dimming voltage, light modulation information one tunnel is composed in series non-linear sample circuit through resistance R 26 with voltage stabilizing two utmost point ZD4, another road light modulation information is through resistance R 25 current limlitings, converge during two-way light modulation information of same and enter voltage stabilizing by voltage stabilizing didoe ZD3, resistance R 27 dividing potential drops, capacitor C 16 filtering obtain the dimmer voltage of 0.5V～2.5V, 0.5V the dimmer voltage one tunnel of～2.5V is sent voltage-PWM change-over circuit 1. (8), voltage-PWM change-over circuit 1. (8) output PWM dim signal send voltage or PWM light modulation constant-current source 2. (12); Another road dimmer voltage is sent voltage or PWM light modulation constant-current source 1. (11), realizes voltage light modulation and the PWM light modulation of LED.
4. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described voltage or PWM light modulation constant-current source be (11) 1., resistance R 54, capacitor C 21, inductance L 2, diode D13, LED D15 and the constant-current driven chip IC15 PAM2862 that can accept voltage light modulation or PWM light modulation.
5. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described system power supply (6) comprises isolating diode D2, power supply control chip IC3 FAN7527, and power supply control chip IC3 also can be L6561, L6562, NCP1606, TDA4863, FAN7530.
6. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described balance resistance (3) comprises resistance NTC1, NTC2, and the value of resistance NTC1, NTC2 is between 5～300 ohm.
7. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described electric capacity battle array output control circuit (14) comprises resistance R 1～R4, R31～R35, four high guaily unit LM324, three-terminal voltage-stabilizing IC5 LM7805.
8. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described output overvoltage under-voltage protecting circuit (9) comprises resistance R 37～R46, capacitor C 18, controllable silicon Q6, optocoupler IC9, the amplifier IC10 TL103 of diode D8～D9 and the accurate voltage comparator of tape base;
Resistance R 45, R46 are that overvoltage detects resistance; resistance R 43, R44 are under-voltage detection resistance; the VCC end pin 8 of the anode welding system power supply control chip FAN7527 of controllable silicon Q6; minus earth; the resistance R 37, the capacitor C 18 that connect the control utmost point are connected to ground, and R38 is to the IC9 optocoupler, and under-voltage, overvoltage control signal is sent from pin 1, the pin 7 of TL103 respectively; when controllable silicon Q6 receives the over-and under-voltage guard signal VCC of FAN7527 end pin 8 moved to it is locked, realize the over-and under-voltage protection.
9. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described voltage-PWM conversion and output overvoltage under-voltage protecting circuit (10), the control program that is solidificated in MCU U2 ATtiny13 comprises: A/D trace routine module (17), primary control program module (18), Output Control Program module (19);
A/D trace routine module (17) is connected with primary control program module (18), and primary control program module (18) is led to Output Control Program module (19).
10. but a kind of output device according to claim 1 has the LED power supply of unloaded underloading protection and receiving phase-cut dimming stably, it is characterized in that:
Described electric capacity battle array output control and voltage-PWM change-over circuit (16), the control program that is solidificated in MCU U3 ATtiny13 comprises: A/D trace routine module (20), primary control program module (21), Output Control Program module (22), A/D detect data processor module (23), electric capacity battle array control output program module (24);
A/D trace routine module (20) links to each other with primary control program module (21), primary control program module (21) is led to Output Control Program module (22) respectively, A/D detects data processor module (23), and A/D detects data processor module (23) and leads to electric capacity battle array control output program module (24).
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