CN100488241C - Input voltage decision device and voltage value range decision method used for it - Google Patents
Input voltage decision device and voltage value range decision method used for it Download PDFInfo
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- CN100488241C CN100488241C CNB2007100023889A CN200710002388A CN100488241C CN 100488241 C CN100488241 C CN 100488241C CN B2007100023889 A CNB2007100023889 A CN B2007100023889A CN 200710002388 A CN200710002388 A CN 200710002388A CN 100488241 C CN100488241 C CN 100488241C
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Abstract
This invention relates to an input voltage judgement device and a judgement method for voltage range used on it, in which, the device includes: a signal receiving end, a first Zener diode, a second Zener diode, a first transistor, a second transistor and a processor, the method includes the following steps: said signal receiving end receives the first signal output by the signal output end, said first Zener diode combines with the first transistor to generate a first output voltage value to the voltage of the first signal, the second Zener diode combines with the second transistor to form a second output voltage value to that of the second signal and the processor judges the sphere of the voltage value of the first signal based on the combination of the first and second output voltage values to reduce cost.
Description
Technical field
The present invention relates to a kind of input voltage judgment means and the range of voltage values determination methods that is applied thereon, relate in particular in having the audio-visual playback equipment of SCART coffret, utilize Zener diode and transistorized combination to judge the technology of scope under the received voltage of signals value.
Background technology
At present on the television set or on audio-visual (Video/Audio) signal transmission interface of some AV devices; regular meeting is applied to a SCART connector; for example: on the device of the television set (TV) of some European specifications or video tape recorder (VCR), this kind SCART connector is a kind of connecting interface or jockey of standard.See also Fig. 1 (a) and Fig. 1 (b), be the schematic diagram of applied SCART connector and its interface; Wherein in Fig. 1 (a), shown a SCART connector 10, the outward appearance of this SCART connector 10 has 21 pins (Pin), and in these pins, include the correspondence control pin that audio ﹠ video is carried out transmitted in both directions, in Fig. 1 (b), then shown a SCART slot 11, this SCART slot 11 has the jack with these SCART connector 10 corresponding pin counts, connects for this above-mentioned SCART connector 10.
Can use this kind connector except general television set or video tape recorder; other is for example as holder for TV playing; VCD player; this type of audio-visual playback equipment or interconnecting device such as set-top box (Set Top Box) or conversion of signals box; also use this kind jockey through regular meeting; for example in Fig. 1 (c); just can be on the coffret of a set-top box 12 by two SCART slots 121 that had on it; 122; offer television set (TV) respectively and be connected, and can connect integration for different audio-visual playback equipments with video tape recorder (VCR) or VCD player.In addition, the user then can be shown in Fig. 1 (d) in operation, with Connect Power the respectively corresponding SCART slot 141,161 of the machine of looking 14 and video tape recorder (or VCD player, holder for TV playing, set-top box or other this type of audio-visual playback equipment) 16 of the SCART connector 101,102 at two ends on the SCART connecting line 100, just can finish the shadow transmission of audio signals and connect (SCART-to-SCART).
And in the middle of 21 pins of above-mentioned SCART connector, one No. 8 pin (Pin 8) wherein switches the control pin of (Widescreen Function Switching) or so-called picture demonstration ratio (Aspect Ratio) for the function of the aspect ratio of the picture of responsible signal of video signal, and described aspect ratio of the picture or image frame show that ratio mainly can include the picture demonstration ratio that traditional 4:3 picture shows ratio and wide screen 16:9, in addition, in the TV set terminal that is connected when receiving the signal of video signal of this pin, can be according to the EN50049-1 and the IEC60933 standard of picture specification standard, judge by the magnitude of voltage that the input voltage standard of its standard comes this signal is presented, show ratio and can demonstrate its correct picture of audio-visual playback equipment that is connected.Detailed voltage standard content is (please consulting Fig. 2 (a) simultaneously): the magnitude of voltage that is presented when the signal input is when 9.5V (volt) is between 12V (volt), represent its image frame to show that ratio is the ratio of 4:3, and the magnitude of voltage that is presented when signal input is between the 4.5V to 7V the time, represent its image frame to show that ratio is the ratio of 16:9, in addition, the magnitude of voltage that is presented when signal input is between the 0V to 2V the time, and then representative does not have the signal source (Inactivesource) that image shows.
Yet, the judgement of the magnitude of voltage that input is presented for signal, the simplest and easy and the most feasible method is to utilize comparator to compare and judge, just the input voltage of signal being converted into digital " 0 " judges with the logic output format of " 1 ", therefore, known technology is to be provided with two can carry out the comparators that logic output is judged in the coffret of this SCART slot, and the picture of combination that can be by three kinds of logical values when representing out above-mentioned three kinds of different voltage ranges respectively shows ratio.
Shown in Fig. 2 (b), be two comparators 21 in a SCART coffret 20,22 work schematic diagram, we are with described comparator 21 in this figure, pass to the voltage of 8.9V and 4V on 22 the negative voltage input respectively, and work as a signal simultaneously to described comparator 21, when 22 positive voltage input is imported the voltage of 9.5V, described comparator 21,22 just produce the logical value of " 1 " simultaneously, and work as this signal simultaneously to described comparator 21, when 22 positive voltage input is imported the voltage of 4.5V, described comparator 21,22 just produce the logical value of " 0 " and " 1 " respectively, and work as this signal simultaneously to described comparator 21, when 22 positive voltage input is imported the voltage of 2V, described comparator 21,22 just produce the logical value of " 0 " simultaneously.
Therefore, when the combination of logical value is all " 1 ", just representing and judging this signal is between 9.5V to 12V, and its image frame shows that ratio is the ratio of 4:3, and when the combination of logical value was respectively " 0 " with " 1 ", then representing and judging this signal was between 4.5V to 7V, and its image frame shows that ratio is the ratio of 16:9, and when the combination of logical value was all " 0 ", then the signal source that image shows was judged in representative.
But because the manufacturing cost of the comparator that the known judgment mechanism of this kind will use is higher, therefore, how can judge that for the input voltage value of signal the alternative elements of seeking out other low production cost just becomes the main purpose of the present invention's development to determine under the principle that correct picture shows ratio finishing.
Summary of the invention
The object of the present invention is to provide a kind of input voltage judgment means and the range of voltage values determination methods that is applied thereon, make in having the audio-visual playback equipment of SCART coffret, can utilize lower Zener diode of production cost and transistorized combination, just can judge the affiliated scope of received voltage of signals value.
The present invention is a kind of input voltage judgment means, be applied within the audio-visual playback equipment with a SCART coffret, this SCART coffret is connected with a signal output part, this input voltage judgment means includes: a signal receiving end, be electrically connected on this signal output part, can receive one first signal that this signal output part is exported; One first Zener diode, the cathode terminal of this first Zener diode is electrically connected on this signal receiving end, has one first revers voltage value; One the first transistor, the base stage of this first transistor is electrically connected on the anode tap of this first Zener diode, have one first forward voltage values, and can produce one first output voltage values to this first voltage of signals value at the collector electrode of this first transistor with this first Zener diode; One second Zener diode, the cathode terminal of this second Zener diode is electrically connected on this signal receiving end, has one second revers voltage value; One transistor seconds, the base stage of this transistor seconds is electrically connected on the anode tap of this second Zener diode, have one second forward voltage values, and can produce one second output voltage values to this first voltage of signals value at the collector electrode of this transistor seconds with this second Zener diode; And a processor is electrically connected on this first transistor and this transistor seconds, can judge scope under this first voltage of signals value according to the combination of this first output voltage values and this second output voltage values.
According to described input voltage judgment means, wherein this first revers voltage value of this first Zener diode is 3.3V, and this second revers voltage value of this second Zener diode is 8.2V.
According to described input voltage judgment means, wherein be connected one first resistance between the collector electrode of this first transistor and one first voltage end, and the emitter terminal of this first transistor is connected to one first earth terminal, be connected one second resistance between the collector electrode of this transistor seconds and one second voltage end, and the emitter terminal of this transistor seconds is connected to one second earth terminal, and this first voltage end and this second voltage end can provide the voltage of 3.3V.
According to described input voltage judgment means, wherein this signal receiving end is one No. 8 pin on this SCART coffret.
According to described input voltage judgment means, wherein this input voltage judgment means also includes a transducer, and this transducer can carry out digital logical transition with this first output voltage values and this second output voltage values, and first output voltage values of this after logical transition and this second output voltage values can be one first logical value of representing high level, or can be low level one second logical value of representative.
According to described input voltage judgment means, wherein this processor stores comparison list, this table of comparisons is writing down all logical value combinations of this first logical value and this second logical value and the scope that each logical value makes up pairing applied signal voltage value, make this processor after this first output voltage values after the logical transition and this second output voltage values are compared this table of comparisons, can judge the affiliated scope of this first voltage of signals value.
Another aspect of the present invention is a kind of range of voltage values determination methods of input voltage, be applied to the transmission course in the SCART coffret that a signal output part inputs to one first signal one audio-visual playback equipment, this audio-visual playback equipment includes a signal receiving end, one first Zener diode, one second Zener diode, a first transistor, a transistor seconds and a processor, and this method comprises the following step: receive this first signal by this signal receiving end; Combination by this first Zener diode and this first transistor produces one first output voltage values to this first voltage of signals value at the collector electrode of this first transistor; Combination by this second Zener diode and this transistor seconds produces one second output voltage values to this first voltage of signals value at the collector electrode of this transistor seconds; And judge scope under this first voltage of signals value according to the combination of this first output voltage values and this second output voltage values by this processor.
Range of voltage values determination methods according to described input voltage, wherein be connected one first resistance between the collector electrode of this first transistor and one first voltage end, and the emitter terminal of this first transistor is connected to one first earth terminal, be connected one second resistance between the collector electrode of this transistor seconds and one second voltage end, and the emitter terminal of this transistor seconds is connected to one second earth terminal, and this first voltage end and this second voltage end can provide the voltage of 3.3V.
Range of voltage values determination methods according to described input voltage, wherein this first Zener diode is set and has one first revers voltage value and this first transistor and be set and have one first forward voltage values, wherein this first revers voltage value is 3.3V, and this first forward voltage values is 0.7V.
Range of voltage values determination methods according to described input voltage, wherein this second Zener diode is set and has one second revers voltage value and this transistor seconds and be set and have one second forward voltage values, wherein this second revers voltage value is 8.2V, and this second forward voltage values is 0.7V.
Range of voltage values determination methods according to described input voltage, wherein this audio-visual playback equipment also includes a transducer, and this processor stores the comparison list of the scope of the applied signal voltage value that is writing down multiple logical value combination and correspondence thereof, and this method also comprises the following step: by this transducer this first output voltage values and this second output voltage values are carried out digital logical transition; And compare after each logical value makes up the scope of pairing applied signal voltage value in this table of comparisons by this first output voltage values and this second output voltage values that this processor will be after logical transition, can judge scope under this first voltage of signals value.
Input voltage judgment means of the present invention is to utilize lower Zener diode of production cost and transistorized combination with the range of voltage values determination methods that is applied thereon, and select suitable revers voltage and forward voltage and finished, therefore can replace the use of the higher comparator of production cost in the well known device, thereby save manufacturing cost.
Description of drawings
By following accompanying drawing and explanation, can more in depth understand the present invention:
Fig. 1 (a) is the schematic diagram of SCART connector 10.
Fig. 1 (b) is the schematic diagram of SCART slot 11.
Fig. 1 (c) has the schematic diagram of the set-top box 12 of two SCART slots 121,122 for coffret.
Fig. 1 (d) is Connect Power the respectively schematic diagram of the machine of looking 14 and video tape recorder 16 of SCART connecting line 100.
Fig. 2 (a) is the standard schematic diagram of image frame demonstration ratio with the voltage range of being imported.
Fig. 2 (b) is the work schematic diagram of two comparators 21,22 in SCART coffret 20.
Fig. 3 (a) is the schematic diagram of the preferred embodiment of the present invention.
Fig. 3 (b) is the circuit diagram of the preferred embodiment of the present invention.
Fig. 3 (c) exports the table of comparisons that makes up with logical value for the voltage that utilizes the corresponding voltage range of circuit framework input of the present invention to produce.
Fig. 4 is the flow chart of the preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100 SCART connecting lines
10,101,102,40 SCART connectors
11,121,122,141,161 SCART slots
12 set-top box, 14 television sets
16 video tape recorders, 20,30 SCART coffrets
21,22 comparators, 300 audio-visual playback equipments
301 signal receiving ends, 302 transducers
303 processors, 311,312,341,342 resistance
321 first Zener diodes, 322 second Zener diodes
331 the first transistors, 332 transistor secondses
351 first voltage ends, 352 second voltage ends
353 first earth terminals, 354 second earth terminals
The V1 first output voltage values V2 second output voltage values
B1, B2 base stage E1, E2 emitter
C1, C2 collector electrode 401 signal output parts
S1～S4 step
Embodiment
See also Fig. 3 (a), be the schematic diagram of the preferred embodiment of the present invention.Wherein on an audio-visual playback equipment 300, has a SCART coffret 30, thereby can utilize the SCART connecting line described in the background technology to finish with other audio-visual playback equipment to be connected with same transmission standard, as shown in the figure, one SCART connector 40 just can be connected (jack that the slot of being installed and this SCART connector 40 have corresponding pin count) with this SCART coffret 30, and the objective of the invention is to utilize a transducer 302 to realize carrying out the simple numerical logical transition for this SCART coffret 30 received signal or institute's input voltages, make it carry out input voltage range and big or small judgement and offer a follow-up processor 303 at the logical value combination that is produced.
As described in the background art, known SCART coffret is to utilize two higher comparators of cost to finish for the comparison of input voltage size and the judgement of affiliated scope, the present invention utilizes the lower electronic component of some production costs replacing the use of aforesaid comparator, and designs the circuit framework that a cover can be finished identical arbitration functions according to this.
See also Fig. 3 (b), be the circuit diagram of the preferred embodiment of the present invention; Thus shown in the figure, wherein this SCART coffret 30 produces by the signal output part 401 in this SCART connector 40 of a signal receiving end 301 and outside and is electrically connected, and this signal receiving end 301 and the function switching (WidescreenFunction Switching) that is configured to responsible signal of video signal aspect ratio of the picture described in the background technology of this signal output part 401 or No. 8 pin (Pin 8) of picture demonstration ratio (Aspect Ratio), on behalf of the image frame of the signal that this signal output part 401 exported, the magnitude of voltage size that signal presented that this signal output part 401 is exported just show ratio.
As mentioned above, the present invention is characterised in that after this signal receiving end 301, be electrically connected separately and pick out two groups of Zener diodes (Zener Diode) and transistorized circuit arrangement, because Zener diode is on the verge of puncture voltage (breakdown voltage to producing imposing a revers voltage (or being called reverse bias), be so-called Zener puncture voltage) time have a level pressure characteristic, this characteristic makes circuit when passing to the electric current of a certain scope, and the voltage at Zener diode two ends can remain on certain value; And known technology also often is applied to the adjustment of voltage for the use of Zener diode, and on the breakdown potential nip when particularly being applied in revers voltage, therefore, our facility reaches the purpose of our desired level pressure with the characteristic of this kind diode.
Shown in Fig. 3 (b), respectively be connected a resistance 311,312 between negative electrode (Cathode) end that we design one first Zener diode 321 and one second Zener diode 322 and this signal receiving end 301, the size of described resistance 311,312 can be 10k Ω, and the function of described resistance can make this circuit arrangement can slow down the change in voltage in its follow-up output effectively.In addition, this first Zener diode 321 and anode (Anode) end of this second Zener diode 322 are electrically connected the base stage (B1 and B2) of a last the first transistor 331 and a transistor seconds 332 respectively, wherein, be connected a resistance 341 between the collector electrode (C1) of one first voltage end 351 and this first transistor 331, its size also can be 10k Ω, emitter (E1) then is electrically connected to one first earth terminal 353, same, one second voltage end 352 is connected a resistance 342 with the collector electrode (C2) of this transistor seconds 332, its size also can be 10k Ω, and emitter (E2) then is electrically connected to one second earth terminal 354.According to embodiments of the invention, in order to meet the standard of EN50049-1 and IEC60933 specifications, the input impedance of signal receiving end 301 just (InputImpedance) must be 10k Ω at least, so the size of resistance 311,312 promptly is designed to 10k Ω.
As mentioned above, we set this first Zener diode 321 respectively and have the revers voltage value of 3.3V and 8.2V with this second Zener diode 322, has the forward voltage values of 0.7V and set this first transistor 331 simultaneously with this transistor seconds 332, in addition, this first voltage end 351 and 352 voltages that 3.3V can be provided of this second voltage end.By general characteristics of transistor as can be known, in the circuit structure of this figure, when the voltage of base stage in this first transistor 331 and emitter during greater than forward voltage values 0.7V itself, this the first transistor 331 can be considered conducting (Turn-on) state, otherwise, when the voltage of this base stage and emitter during less than forward voltage values 0.7V itself, this first transistor 331 can be considered disconnection (Turn-off) state; Simultaneously, when this first transistor 331 is conducting state, one first output voltage values V1 of the collector terminal of this first transistor 331 (C1) just can be rendered as 0V in this circuit framework, yet, when this first transistor 331 was off-state, this first output voltage values V1 of the collector terminal of this first transistor 331 (C1) just can be rendered as 3.3V.Same, on one second output voltage values V2 of the collector terminal (C2) of this transistor seconds 332, identical condition and output result are arranged also.According to embodiments of the invention, because the magnitude of voltage of the logical value " 1 " of the high level of processor 303 is 3.3V, therefore, first voltage end 351 is 3.3V with the magnitude of voltage of this second voltage end 352.Certainly, use the processor of other specification also can realize the present invention.For example, when the magnitude of voltage of the logical value " 1 " of the high level of processor was 5.0V, then first voltage end 351 was 5.0V with the magnitude of voltage of this second voltage end 352.That is to say that the present invention can supply the magnitude of voltage of first voltage end 351 with this second voltage end 352 according to the specification of processor.
So, we can be by the output combination situations of this first output voltage values V1 and this second output voltage values V2, judge that the voltage of signals value size of being imported from this signal output part 401 is to belong to which kind of voltage range, and why the image frame that this signal will present shows ratio.We can further utilize this transducer 302, this first output voltage values V1 and this second output voltage values V2 are carried out digital logical transition, because described transistor can present conducting state and off-state, make this first output voltage values V1 or the possible output situation of this second output voltage values V2 that two kinds of 0V or 3.3V only be arranged, therefore on logical transition, just can represent the logical value " 1 " of high level for the output of 3.3V, and on logical transition, just can represent low level logical value " 0 " for the output of 0V.
Therefore, the first output voltage values V1 of this after logical transition and this second output voltage values V2, just there are three kinds of possible combinations " 0 " of its logical value with the output of " 1 "; By described in the background technology as can be known, when the magnitude of voltage of signal input between the 9.5V to 12V the time, represent its image frame to show that ratio is the ratio of 4:3, and when the magnitude of voltage of signal input be between the 4.5V to 7V the time, represent its image frame to show that ratio is the ratio of 16:9, and when the magnitude of voltage of signal input be between the 0V to 2V the time, then representative does not have the signal source that image shows; So in this preferred embodiment of the present invention, we detect the voltage of this circuit structure and judge situation also at the signal input of different voltage ranges.
Identical with background technology, we are same to select with the magnitude of voltage of 8.9V and the 4V critical value as scope under the voltage, promptly than the 4.5V that judges scope lower limit under its voltage, magnitude of voltage 4V has the tolerance limit degree of 0.5V, and than the 9.5V that judges range limit under its voltage, magnitude of voltage 8.9V has the tolerance limit degree of 0.7V, and supposes that this signal of being imported is the magnitude of voltage with signification scope, and the situation that is input as the magnitude of voltage between the 7.1V to 9.4V is not arranged; When its voltage of signal of being imported when this signal output part 401 certainly is 8.9V, because the revers voltage value of this first Zener diode 321 and this second Zener diode 322 has the size of 3.3V and 8.2V respectively, and the forward voltage values of this first transistor 331 and this transistor seconds 332 all has the size of 0.7V, therefore make this first transistor 331 be all conducting state, and the output valve of this first output voltage values V1 and this second output voltage values V2 is all 0V with this transistor seconds 332.Therefore, at input voltage greater than this scope of 9.5V to 12V of 8.9V, we just can be all 0V (or be all " 0 " via its logical value after the logical transition) according to two magnitudes of voltage of being exported, and design makes this processor 303 be judged as the scope of 9.5V to 12V, and then selects the image frame demonstration ratio of correct 4:3.
When its voltage of signal of being imported when this signal output part 401 certainly is 4V, because the revers voltage value of this first Zener diode 321 and this second Zener diode 322 has the size of 3.3V and 8.2V respectively, so the forward voltage values that this first transistor 331 is only arranged has the size of 0.7V, therefore making this first transistor 331 be off-state for 332 of this transistor secondses of conducting state, is that the output valve of this second output voltage values of 0V V2 then is 3.3V so make this first output voltage values V1 that is produced.Therefore, at input voltage greater than this scope of 4.5V to 7V of 4V (and less than 8.9V), we just can be respectively 0V and 3.3V (or be respectively " 0 " and " 1 " via its logical value after the logical transition) according to two magnitudes of voltage being exported, and design makes this processor 303 be judged as the scope of 4.5V to 7V, and then selects the image frame demonstration ratio of correct 16:9.
Yet, its voltage of signal of importing when this signal output part 401 certainly is for less than 4V the time, because the revers voltage value of this first Zener diode 321 and this second Zener diode 322 has the size of 3.3V and 8.2V respectively, and the forward voltage values of this first transistor 331 and this transistor seconds 332 does not all have the size of 0.7V, therefore make this first transistor 331 be all off-state, so make this first output voltage values V1 that produced and the output valve of this second output voltage values V2 be all 3.3V with this transistor seconds 332.Therefore, at input voltage less than this scope of 0V to 2V of 4V, we just can be all 3.3V (or be all " 1 " via its logical value after the logical transition) according to two magnitudes of voltage of being exported, and design makes this processor 303 be judged as the scope of 0V to 2V, and then selects the correct judgement of the signal source of image demonstration.
In sum as can be known, we can the success judge scope under the voltage of signals that this signal output part 401 is imported according to this circuit structure, and can be set and make this follow-up processor 303 can select correct image frame to show ratio, in addition, we also can become the standard design of this judgement comparison list (shown in Fig. 3 (c), for the voltage that utilizes the corresponding voltage range of circuit framework input of the present invention to produce is exported the table of comparisons that makes up with logical value), and this table of comparisons is stored in this processor 303, this table of comparisons just can write down above-mentioned at least three kinds logical value combination, make up pairing range of voltage values with each logical value, make that this processor 303 just can be with after this first output voltage values V1 after the logical transition and this second output voltage values V2 compare this table of comparisons, come from the affiliated scope of voltage of signals value that this signal output part 401 is imported and can judge rightly, and then can also select correct image frame demonstration ratio.
See also Fig. 4, be the flow chart of the preferred embodiment of the present invention.At first, the signal of being exported by signal receiving end 301 received signal outputs 401 at step S1; Secondly, at step S2 respectively by of the combination of first Zener diode 321 with the first transistor 331, and by the combination of second Zener diode 322 with transistor seconds 332, and can produce the first output voltage values V1 and the second output voltage values V2 to the voltage of signals value of being imported from signal output 401 respectively; Then, carry out digital logical transition at step S3 by the 302 couples first output voltage values V1 of transducer and the second output voltage values V2; At last, step S4 will be after logical transition by processor 303 the first output voltage values V1 and second output voltage values V2 comparison comparison list in after each logical value makes up pairing range of voltage values, judge that scope shows ratio to select correct image frame under the voltage of signals value that signal output 401 is imported.
By above embodiment explanation as can be known, circuit framework of the present invention, show correctly the choosing of ratio except reaching correct judgement and the image frame that well known device can finish for input voltage range, circuit framework of the present invention is to utilize lower Zener diode of production cost and transistorized combination, and select suitable revers voltage and forward voltage and finished, therefore can replace the use of the higher comparator of production cost in the well known device, make the producer's manufacturing cost can obtain saving and improve.Therefore, the present invention solves the problem of the manufacturing cost described in the background technology effectively, and can successfully reach the main purpose of the present invention's development.
The present invention can carry out various modifications and conversion by the those skilled in the art, yet it does not all break away from the protection range of claims.
Claims (11)
1. an input voltage judgment means is applied in the audio-visual playback equipment with a SCART coffret, and this SCART coffret is connected with a signal output part, and this input voltage judgment means includes:
One signal receiving end is electrically connected on this signal output part, can receive one first signal that this signal output part is exported;
One first Zener diode, the cathode terminal of this first Zener diode is electrically connected on this signal receiving end, has one first revers voltage value;
One the first transistor, the base stage of this first transistor is electrically connected on the anode tap of this first Zener diode, have one first forward voltage values, and can produce one first output voltage values to this first voltage of signals value at the collector electrode of this first transistor with this first Zener diode;
One second Zener diode, the cathode terminal of this second Zener diode is electrically connected on this signal receiving end, has one second revers voltage value;
One transistor seconds, the base stage of this transistor seconds is electrically connected on the anode tap of this second Zener diode, have one second forward voltage values, and can produce one second output voltage values to this first voltage of signals value at the collector electrode of this transistor seconds with this second Zener diode; And
One processor is electrically connected on this first transistor and this transistor seconds, can judge scope under this first voltage of signals value according to the combination of this first output voltage values and this second output voltage values.
2. input voltage judgment means as claimed in claim 1, wherein this first revers voltage value of this first Zener diode is 3.3V, and this second revers voltage value of this second Zener diode is 8.2V.
3. input voltage judgment means as claimed in claim 1, wherein be connected one first resistance between the collector electrode of this first transistor and one first voltage end, and the emitter terminal of this first transistor is connected to one first earth terminal, be connected one second resistance between the collector electrode of this transistor seconds and one second voltage end, and the emitter terminal of this transistor seconds is connected to one second earth terminal, and this first voltage end and this second voltage end can provide the voltage of 3.3V.
4. input voltage judgment means as claimed in claim 1, wherein this signal receiving end is one No. 8 pin on this SCART coffret.
5. input voltage judgment means as claimed in claim 1, wherein this input voltage judgment means also includes a transducer, and this transducer can carry out digital logical transition with this first output voltage values and this second output voltage values, and first output voltage values of this after logical transition and this second output voltage values can be one first logical value of representing high level, or can be low level one second logical value of representative.
6. input voltage judgment means as claimed in claim 5, wherein this processor stores comparison list, this table of comparisons is writing down all logical value combinations of this first logical value and this second logical value and the scope that each logical value makes up pairing applied signal voltage value, make this processor after this first output voltage values after the logical transition and this second output voltage values are compared this table of comparisons, can judge the affiliated scope of this first voltage of signals value.
7. the range of voltage values determination methods of an input voltage, be applied to the transmission course in the SCART coffret that a signal output part inputs to one first signal one audio-visual playback equipment, this audio-visual playback equipment includes a signal receiving end, one first Zener diode, one second Zener diode, a first transistor, a transistor seconds and a processor, and this method comprises the following step:
Receive this first signal by this signal receiving end;
Combination by this first Zener diode and this first transistor produces one first output voltage values to this first voltage of signals value at the collector electrode of this first transistor;
Combination by this second Zener diode and this transistor seconds produces one second output voltage values to this first voltage of signals value at the collector electrode of this transistor seconds; And
Judge scope under this first voltage of signals value by this processor according to the combination of this first output voltage values and this second output voltage values.
8. the range of voltage values determination methods of input voltage as claimed in claim 7, wherein be connected one first resistance between the collector electrode of this first transistor and one first voltage end, and the emitter terminal of this first transistor is connected to one first earth terminal, be connected one second resistance between the collector electrode of this transistor seconds and one second voltage end, and the emitter terminal of this transistor seconds is connected to one second earth terminal, and this first voltage end and this second voltage end can provide the voltage of 3.3V.
9. the range of voltage values determination methods of input voltage as claimed in claim 8, wherein this first Zener diode is set and has one first revers voltage value and this first transistor and be set and have one first forward voltage values, wherein this first revers voltage value is 3.3V, and this first forward voltage values is 0.7V.
10. the range of voltage values determination methods of input voltage as claimed in claim 8, wherein this second Zener diode is set and has one second revers voltage value and this transistor seconds and be set and have one second forward voltage values, wherein this second revers voltage value is 8.2V, and this second forward voltage values is 0.7V.
11. the range of voltage values determination methods of input voltage as claimed in claim 7, wherein this audio-visual playback equipment also includes a transducer, and this processor stores the comparison list of the scope of the applied signal voltage value that is writing down multiple logical value combination and correspondence thereof, and this method also comprises the following step:
By this transducer this first output voltage values and this second output voltage values are carried out digital logical transition; And
Compare after each logical value makes up the scope of pairing applied signal voltage value in this table of comparisons by this first output voltage values and this second output voltage values that this processor will be after logical transition, can judge scope under this first voltage of signals value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100023889A CN100488241C (en) | 2007-01-15 | 2007-01-15 | Input voltage decision device and voltage value range decision method used for it |
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| CNB2007100023889A CN100488241C (en) | 2007-01-15 | 2007-01-15 | Input voltage decision device and voltage value range decision method used for it |
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| CN101001349A CN101001349A (en) | 2007-07-18 |
| CN100488241C true CN100488241C (en) | 2009-05-13 |
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| CN101605217B (en) * | 2008-06-10 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | SCART interface control circuit and electronic equipment using same |
| CN110750061B (en) * | 2019-10-18 | 2023-02-03 | 天津津航计算技术研究所 | Method for enhancing transmission reliability of discrete signal |
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