CN202334732U - Protection circuit and television - Google Patents
Protection circuit and television Download PDFInfo
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- CN202334732U CN202334732U CN2011204585552U CN201120458555U CN202334732U CN 202334732 U CN202334732 U CN 202334732U CN 2011204585552 U CN2011204585552 U CN 2011204585552U CN 201120458555 U CN201120458555 U CN 201120458555U CN 202334732 U CN202334732 U CN 202334732U
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Abstract
The utility model is suitable for the electron field, and provides a protection circuit and a television with the protection circuit. The protection circuit comprises a power supply, a first switching circuit and a commutation circuit, wherein the protection circuit also comprises a DC-DC transforming circuit for transforming a power voltage to a load power supply output voltage, a second switching circuit for controlling the DC-DC transforming circuit, a detection circuit for detecting the power voltage, and a comparative control module for controlling the operation of the first switching circuit and the second switching circuit. The protection circuit can ensure that the load power supply output voltage is in the voltage range borne by a load (as an LCD, an LED display and the like), and provides a normal load power supply output voltage, and effectively prevents the load from being damaged due to the faulty operation in a maintenance, test or production process, thus the production operations cost is reduced, and operators can be reminded according to a set bell when the power voltage is abnormal.
Description
Technical field
The utility model belongs to electronic applications, relates in particular to a kind of protective circuit.
Background technology
At present, some display devices and electronic load misoperation occurs and cause electric voltage to damage above its tolerance range through regular meeting at production, detection and maintenance process, are example with the liquid crystal display screen; The operating voltage of liquid crystal display screen T-CON plate mainly contains in the television set the inside+5V ,+12V; Generally to be direct voltage be connected to above the screen after forming commutation circuit by metal-oxide-semiconductor supply power mode, selects different supply voltages according to different screens, when the operating voltage of shielding be+during 5V; Because misoperation is connected to this screen when top with direct voltage for the signal plate of+12V; Because the voltage that screen bears is 5V ± 10%, having surpassed the voltage screen that can bear can damage, and what cost was the highest on the television set also is screen; Thereby improved operating cost greatly, so prior art needs to improve.
Summary of the invention
The purpose of the utility model is to provide a kind of protective circuit, is intended to solve the problem that voltage that prior art can bear owing to misoperation causes the supply power voltage of load (such as liquid crystal display screen, light-emitting diode display etc.) to surpass damages.In order to solve the problems of the technologies described above, the utility model adopts following scheme to be achieved:
A kind of protective circuit comprises power supply, first switching circuit, commutation circuit, and wherein said commutation circuit first input end is connected with the output of first switching circuit, second input is connected with power supply, and output is exported as electric; It is characterized in that said protective circuit also comprises:
Be used for supply voltage is converted into the DC-DC change-over circuit of electric output voltage, the first input end of said DC-DC change-over circuit is connected with power supply, output is connected with the output of commutation circuit;
Be used to control the second switch circuit of DC-DC change-over circuit work, the output of said second switch circuit is connected with second input of DC-DC change-over circuit;
Be used to detect the testing circuit of supply voltage, the input of said testing circuit is connected with power supply;
Be used to control the comparison control module of first switching circuit, second switch circuit working, said relatively the input of control module is connected with the output of testing circuit, first output is connected with the input of first switching circuit, second output is connected with the input of second switch circuit.
Further, said testing circuit comprises low speed analog-to-digital conversion module, voltage stabilizing didoe, first resistance, second resistance, first electric capacity;
Wherein first end of first resistance is connected with power supply, second end is connected with first end of the negative electrode of voltage stabilizing didoe and second resistance, first electric capacity respectively; Said first electric capacity is connected with second end of second resistance and ground connection with second end of the parallel connection of second resistance and first electric capacity, and second end of said second resistance also is connected with the anode of voltage stabilizing didoe; Second end of said first resistance also is connected with the input of low speed analog-to-digital conversion module, and the output of said low speed analog-to-digital conversion module is connected with the input that compares control module.
Further, said second switch circuit comprises the 13 resistance, the 14 resistance, second triode; Wherein first end of the 14 resistance connects second output that compares control module, the base stage that second end connects second triode, and the grounded emitter of said second triode, collector electrode are connected to second input of DC-DC change-over circuit through the 13 resistance.
Further, said DC-DC change-over circuit comprises chip, inductance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance;
Wherein first end of the 8th resistance is connected with power supply, and second end is connected with the 7th pin of chip; First end of said the 8th resistance also is connected with the crus secunda of chip and first end of the 5th electric capacity respectively; The 6th pin of said chip is connected with second end of the 5th electric capacity and ground connection through the 6th electric capacity, the 9th resistance successively; Octal is connected with the 4th pin through the 7th electric capacity, and the 4th pin of said chip also is connected with second end of the 5th electric capacity and ground connection; First pin of said chip is connected to tripod, tripod through the 8th electric capacity and also is connected with first end of the 12 resistance, the tenth electric capacity and the positive pole of the 9th electric capacity respectively through inductance; Second end of said the 12 resistance is connected to the 5th pin of chip through the 11 resistance; The 5th pin of said chip also is connected and ground connection with the negative pole of the 9th electric capacity, second end of the tenth electric capacity respectively through the tenth resistance, and the 9th electric capacity is parallelly connected with the tenth electric capacity; The tripod of said chip also is connected with the output of commutation circuit through inductance.
Further; Said first switching circuit comprises the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first triode, and wherein first end of the 6th resistance is connected with first output of control module relatively, second end is connected with first end of the 5th resistance, the 7th resistance respectively; The second end ground connection of said the 5th resistance, second end of the 7th resistance connect the base stage of first triode, and the grounded emitter of said first triode, collector electrode connect the first input end of commutation circuit through the 4th resistance.
Further, said commutation circuit comprises metal-oxide-semiconductor, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 3rd resistance; Wherein first end of second electric capacity is connected with power supply, second end is connected with second end of the 3rd electric capacity and ground connection; First end of said second electric capacity also is connected with first end of the 3rd resistance, the 4th electric capacity respectively, and second end of said the 3rd resistance links to each other with second end of said the 4th electric capacity and is connected with the 4th pin of metal-oxide-semiconductor; First end of said second electric capacity also is connected with first pin of metal-oxide-semiconductor; Said metal-oxide-semiconductor crus secunda, tripod all link to each other with first pin, as the source electrode of metal-oxide-semiconductor; The 5th pin, the 6th pin, the 7th pin all link to each other with octal, as the drain electrode of metal-oxide-semiconductor; The 4th pin is a grid.
Further, said metal-oxide-semiconductor is the P channel MOS tube of single channel enhancement mode.
Another purpose of the utility model also provides the television set with above-mentioned protective circuit.
The protective circuit that the utility model adopts; Detect the size of supply voltage through testing circuit; Control the break-make of first switching circuit, second switch circuit by comparing control module, thereby the break-make of control commutation circuit and DC-DC change-over circuit guarantees that the electric output voltage is in the voltage range that load (such as liquid crystal display screen, light-emitting diode display etc.) can be born; And normal electric output voltage is provided; Effectively prevent misoperation in maintenance, test or production process and cause load to damage, reduced the production operating cost, and when supply voltage is unusual, can remind operating personnel according to the tinkle of bells that configures.
Description of drawings
Fig. 1 is the protective circuit structural principle block diagram that the utility model provides;
Fig. 2 is the concrete circuit connection diagram of protective circuit that the utility model provides.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment; Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the protective circuit structural principle block diagram that the utility model provides, and details are as follows:
A kind of protective circuit; Comprise power supply 11, first switching circuit 17, commutation circuit 16; Said commutation circuit 16 first input ends are connected with the output of first switching circuit 17, second input is connected with power supply 11, and output is exported as electric, and said power circuit also comprises:
Be used for supply voltage is converted into the DC-DC change-over circuit 15 of electric output voltage, the first input end of said DC-DC change-over circuit 15 is connected with power supply 11, output is connected with the output of commutation circuit 16;
Be used to control the second switch circuit 14 of DC-DC change-over circuit 15 work, the output of said second switch circuit 14 is connected with second input of DC-DC change-over circuit 15;
Be used to detect the testing circuit 13 of supply voltage, the input of said testing circuit 13 is connected with power supply 11;
Be used to control the comparison control module 12 of first switching circuit 17,14 work of second switch circuit; It is said that relatively the input of control module 12 is connected with the output of testing circuit 13, first output is connected with the input of first switching circuit 17, second output is connected with the input of second switch circuit 14.
Fig. 2 is the concrete circuit connection diagram of protective circuit that the utility model provides, and details are as follows:
This protective circuit comprises power supply 11, relatively control module 12, testing circuit 13, second switch 14, second voltage conversion circuit 15, commutation circuit 16, first switching circuit 17.
Said power supply 11 comprises the first magnetic bead FB1, the second magnetic bead FB2; Wherein first power supply through the first magnetic bead FB1 as first power supply export, second source exports as second source through the second magnetic bead FB2, the output of the said first magnetic bead FB1 links to each other with the output of the second magnetic bead FB2; In the utility model embodiment, said first power supply is+5V, second source be+12V.
Said testing circuit 13 comprises low speed analog-to-digital conversion module, voltage stabilizing didoe ZD1, first resistance R 1, second resistance R 2, first capacitor C 1, and wherein first end of first resistance R 1 is connected with power supply 11, second end is connected with first end of the negative electrode of voltage stabilizing didoe ZD1 and second resistance R 2, first capacitor C 1 respectively; Said first capacitor C 1 is connected with second end of second resistance R 2 and ground connection with second end of 2 parallel connections of second resistance R and first capacitor C 1, and second end of said second resistance R 2 also is connected with the anode of voltage stabilizing didoe ZD1; Second end of said first resistance R 1 also is connected with the input of low speed analog-to-digital conversion module, and the output of low speed analog-to-digital conversion module is connected with the input that compares control module 12.
Said first switching circuit 17 comprises the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first triode Q1, and wherein first end of the 6th resistance is connected with first output of control module relatively, second end is connected with first end of the 5th resistance R 5, the 7th resistance R 7 respectively; The second end ground connection of said the 5th resistance R 5, second end of the 7th resistance R 7 connect the base stage of the first triode Q1; The grounded emitter of the said first triode Q1, collector electrode connect the first input end of commutation circuit 16 through the 4th resistance R 4; In the utility model is implemented, promptly be connected to the grid of metal-oxide-semiconductor Q100.
Said commutation circuit 16 comprises metal-oxide-semiconductor Q100, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 3rd resistance R 3; Wherein first end of second capacitor C 2 is connected with power supply 11, second end is connected with second end of the 3rd capacitor C 3 and ground connection; First end of said second capacitor C 2 also is connected with first end of the 3rd resistance R 3, the 4th capacitor C 4 respectively, and second end of said the 3rd resistance R 3 links to each other with second end of said the 4th capacitor C 4 and is connected with the 4th pin of metal-oxide-semiconductor Q100; First end of said second capacitor C 2 also is connected with first pin of metal-oxide-semiconductor Q100, and said metal-oxide-semiconductor Q100 crus secunda, tripod all link to each other with first pin, and the 5th pin, the 6th pin, the 7th pin all link to each other with octal; The P channel MOS tube that said metal-oxide-semiconductor Q100 is a single channel enhancement mode, first, second and third pin is source electrode, and the 4th pin is that grid, the 5th, six, seven, octal are drain electrode.
Said second switch circuit 14 comprises the 13 resistance R the 13, the 14 resistance R 14, the second triode Q2; Wherein first end of the 14 resistance connects second output that compares control module, the base stage that second end connects second triode; The grounded emitter of the said second triode Q2, collector electrode are connected to second input of DC-DC change-over circuit 15 through the 13 resistance R 13; In the utility model embodiment, promptly be connected to the 7th pin of chip U1.
Said DC-DC change-over circuit 15 comprises chip U1, inductance L 1, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, the 9th capacitor C 9, the tenth capacitor C 10, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R 12;
Wherein first end of the 8th resistance R 8 is connected with power supply 11, and second end is connected with the 7th pin of chip U1; First end of said the 8th resistance R 8 also is connected with the crus secunda of chip U1 and first end of the 5th capacitor C 5 respectively; The 6th pin of said chip U1 is connected also ground connection through the 6th capacitor C 6, the 9th resistance R 9 successively with second end of the 5th capacitor C 5; Octal is connected with the 4th pin through the 7th capacitor C 7, and the 4th pin of said chip U1 also is connected with second end of the 5th capacitor C 5 and ground connection; First pin of said chip U1 is connected to tripod, tripod through the 8th capacitor C 8 and also is connected with the 12 resistance R 12, first end of the tenth capacitor C 10 and the positive pole of the 9th capacitor C 9 respectively through inductance L 1; Second end of said the 12 resistance R 12 is connected to the 5th pin of chip U1 through the 11 resistance R 11; The 5th pin of said chip U1 also is connected and ground connection with the negative pole of the 9th capacitor C 9, second end of the tenth capacitor C 10 respectively through the tenth resistance R 10, and the 9th capacitor C 9 is parallelly connected with the tenth capacitor C 10; The tripod of said chip U1 also is connected with the output of commutation circuit 16 through inductance L 1; Wherein the 9th capacitor C 9 is a polar capacitor.
In the utility model embodiment, load is example with the liquid crystal display screen, the operating voltage of liquid crystal display screen T-CON plate mainly contains+5V ,+12V; The metal-oxide-semiconductor Q100 model that said commutation circuit 16 adopts is SI9435, and its conducting is perhaps by being controlled by first switching circuit 17, when relatively first output output of control module 12 is changed to low level; Then the first triode Q1 base stage is a low level; The first triode Q1 ends, and when the 4th pin of metal-oxide-semiconductor Q100 was high level, promptly the voltage difference between source electrode and the grid was less than conducting voltage; Metal-oxide-semiconductor Q100 ends, and the drain electrode output voltage is zero; When relatively first output output of control module 12 is changed to high level; Then the first triode Q1 base stage is a high level, and the first triode Q1 conducting is when the 4th pin of metal-oxide-semiconductor Q100 is low level; Be voltage difference between source electrode and the grid greater than conducting voltage, metal-oxide-semiconductor Q100 conducting.
The said DC-DC change-over circuit 15 chip U1 that adopts is the DC-DC chip, and model is MP1484; Said chip U1 the 7th pin is for enabling pin, by 14 controls of second switch circuit, when relatively second output output of control module 12 is changed to high level; Then the second triode Q2 base stage is a high level; The second triode Q2 conducting, chip U1 is a low level, chip U1 does not work; When relatively second output output of control module 12 was changed to low level, then the second triode Q2 base stage was a low level, and the second triode Q2 ends, and chip U1 the 7th pin is a high level, chip U1 work, realization+12V commentaries on classics+5V; Said chip U1 crus secunda is that input pin, tripod are that output pin, the 5th pin are the feedback pin; Said the 8th resistance R 8 flow point piezoresistance that exceeds, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R 12 is the feedback divider resistance, wherein the 6th electric capacity R6 constitutes RC networks with the 9th resistance R 9, plays the effect that compensates control loop; The 9th capacitor C 9 and 10 pairs of output circuits of the tenth capacitor C carry out filtering.
Said testing circuit 13 comprises low speed analog-to-digital conversion module, voltage stabilizing didoe ZD1, first resistance R 1, second resistance R 2, first capacitor C 1, and wherein the low speed analog-to-digital conversion module is converted into digital signal with the analog signal that detects and is connected with comparison control module 12 through the I/O interface; Said low speed analog-to-digital conversion module has a plurality of sampling precisions, such as 8bit, 10bit, 12bit, 16bit, is example with 8bit range+5V supply power voltage, and because of resolution is 8, it can be to 1/2 of gamut
8=1/256 increment is reacted, and (resolution is high more; React sensitiveer, can select resolution as required), can tell 0xFF kind magnitude of voltage; Resolution is 5V * 1/256 ≈ 0.0195V; If be divided into 256 parts to 5V, the corresponding 0XA8 of 3.3V, the voltage of certain between the 0-3.3V just can correspond to 0x00 to certain the 16 system number between the 0XA8 so.Said voltage stabilizing didoe ZD1 is+the 5V voltage stabilizing didoe, for preventing that detecting voltage VCC2 surpasses+5V, damages master chip; Said first resistance R 1, second resistance R 2 are divider resistance, then said detection voltage VCC2=VCC1 * R2/ (R2+R1), and wherein VCC1 is a supply voltage.
Guarantee to detect under voltage VCC2 can normally detect differentiation in voltage range the prerequisite, can choose the resistance of first resistance R 1, second resistance R 2 arbitrarily, choosing R1=22K in the present embodiment, R2=7.5K; When choosing the power supply of first power supply, i.e. during selection+5V power supply, supply voltage VCC1=+5V detects voltage VCC2=1.27V; When choosing the second source power supply, i.e. during selection+12V power supply, supply voltage VCC1=+12V detects voltage VCC2=3.05V; Because supply voltage VCC1 has 10% error, then the detection voltage VCC2 scope of two kinds of screens for Wei not 1.14V-1.40V, 2.75V-3.36V; 1.14V-1.40V the hexadecimal number through corresponding behind the analog to digital converter of 8bit is 0X3A-0X47,2.75V-3.36V is 0X8C-0XAC through hexadecimal number corresponding behind the analog to digital converter of 8bit.
This protective circuit operation principle is following:
When join+during the liquid crystal display screen of 5V; System deposits the tinkle of bells one and the tinkle of bells two earlier; Represent supply voltage to be higher than 12V+10% respectively and be lower than 12V-10%, relatively to be provided with and to detect voltage VCC2 normal range (NR) be 1.14V-1.40V to control module 12, and corresponding hexadecimal number is 0X3A-0X47.Mainboard powers on, and system initialization is with relatively first output output of control module 12 is changed to low level, the output of second output is changed to high level; Compare the value after control module 12 relatively detects voltage VCC2 process low speed analog-to-digital conversion module simultaneously, if within 0X3A-0X47 scope, first output output that then will compare control module 12 is changed to high level; The first triode Q1 base stage is high level; The first triode Q1 conducting, when the 4th pin of metal-oxide-semiconductor Q100 was low level, promptly the voltage difference between source electrode and the grid was greater than conducting voltage; Then metal-oxide-semiconductor Q100 conducting, output+5V gives the screen power supply; Otherwise if not within this scope, first output output that then will compare control module 12 is changed to low level; The first triode Q1 base stage is low level, and the first triode Q1 ends, when the 4th pin of metal-oxide-semiconductor Q100 is high level; Be that voltage difference between source electrode and the grid is less than conducting voltage; Then metal-oxide-semiconductor Q100 ends, and the drain electrode output voltage is zero, prevents that wrong voltage from damaging the screen body; Relatively whether control module 12 detects simultaneously in the 0X8C-0XAC scope, if within scope, second output that then will compare control module 12 is exported and is changed to low level, and the second triode Q2 base stage is low level; The second triode Q2 ends, and chip U1 the 7th pin then is a high level, chip U1 work, and realization+12V commentaries on classics+5V gives the screen normal power supply; If not within scope, second output output that then continues to compare control module 12 is changed to high level, and judges whether greater than 0XAC, if; Then play the tinkle of bells one, remind supply voltage too high, should cut off the electricity supply immediately; If be lower than 0XAC, play the tinkle of bells two, remind power voltage insufficient.
When join+during the liquid crystal display screen of 12V; System deposits the tinkle of bells one and the tinkle of bells two earlier; Represent supply voltage to be higher than 12V+10% respectively and be lower than 12V-10%, relatively to be provided with and to detect voltage VCC2 normal range (NR) be 2.75V-3.36V to control module 12, and corresponding hexadecimal number is 0X8C-0XAC.Mainboard powers on, and system initialization is with relatively first output output of control module 12 is changed to low level, the output of second output is changed to high level; Compare the value after control module 12 relatively detects voltage VCC2 process low speed analog-to-digital conversion module simultaneously,, then normally start if within 0X8C-0XAC scope; First output output of comparing control module 12 is changed to high level, and the first triode Q1 base stage is high level, the first triode Q1 conducting; When the 4th pin of metal-oxide-semiconductor Q100 is low level; Be voltage difference between source electrode and the grid greater than conducting voltage, then metal-oxide-semiconductor Q100 conducting, output+12V gives the screen power supply; Otherwise if not within this scope then first output output that continues to compare control module 12 is changed to low level, metal-oxide-semiconductor Q100 can not conducting; And whether detect simultaneously greater than 0XAC, if greater than 0XAC, play the tinkle of bells one; The prompting supply voltage is too high, should cut off the electricity supply immediately, if be lower than 0XAC; Play the tinkle of bells two, remind power voltage insufficient.
The protective circuit that the utility model adopts; Detect the size of supply voltage through testing circuit; Control the break-make of first switching circuit, second switch circuit by comparing control module, thereby the break-make of control commutation circuit and DC-DC change-over circuit guarantees that the electric output voltage is in the voltage range that load (such as liquid crystal display screen, light-emitting diode display etc.) can be born; And normal electric output voltage is provided; Effectively prevent misoperation in maintenance, test or production process and cause load to damage, reduced the production operating cost, and when supply voltage is unusual, can remind operating personnel according to the tinkle of bells that configures.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. a protective circuit comprises power supply, first switching circuit, commutation circuit, and wherein said commutation circuit first input end is connected with the output of first switching circuit, second input is connected with power supply, and output is exported as electric; It is characterized in that said protective circuit also comprises:
Be used for supply voltage is converted into the DC-DC change-over circuit of electric output voltage, the first input end of said DC-DC change-over circuit is connected with power supply, output is connected with the output of commutation circuit;
Be used to control the second switch circuit of DC-DC change-over circuit work, the output of said second switch circuit is connected with second input of DC-DC change-over circuit;
Be used to detect the testing circuit of supply voltage, the input of said testing circuit is connected with power supply;
Be used to control the comparison control module of first switching circuit, second switch circuit working, said relatively the input of control module is connected with the output of testing circuit, first output is connected with the input of first switching circuit, second output is connected with the input of second switch circuit.
2. protective circuit according to claim 1 is characterized in that, said testing circuit comprises low speed analog-to-digital conversion module, voltage stabilizing didoe, first resistance, second resistance, first electric capacity;
Wherein first end of first resistance is connected with power supply, second end is connected with first end of the negative electrode of voltage stabilizing didoe and second resistance, first electric capacity respectively; Said first electric capacity is connected with second end of second resistance and ground connection with second end of the parallel connection of second resistance and first electric capacity, and second end of said second resistance also is connected with the anode of voltage stabilizing didoe; Second end of said first resistance also is connected with the input of low speed analog-to-digital conversion module, and the output of said low speed analog-to-digital conversion module is connected with the input that compares control module.
3. protective circuit according to claim 1 is characterized in that, said second switch circuit comprises the 13 resistance, the 14 resistance, second triode; Wherein first end of the 14 resistance connects second output that compares control module, the base stage that second end connects second triode, and the grounded emitter of said second triode, collector electrode are connected to second input of DC-DC change-over circuit through the 13 resistance.
4. protective circuit according to claim 1; It is characterized in that said DC-DC change-over circuit comprises chip, inductance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance;
Wherein first end of the 8th resistance is connected with power supply, and second end is connected with the 7th pin of chip; First end of said the 8th resistance also is connected with the crus secunda of chip and first end of the 5th electric capacity respectively; The 6th pin of said chip is connected with second end of the 5th electric capacity and ground connection through the 6th electric capacity, the 9th resistance successively; Octal is connected with the 4th pin through the 7th electric capacity, and the 4th pin of said chip also is connected with second end of the 5th electric capacity and ground connection; First pin of said chip is connected to tripod, tripod through the 8th electric capacity and also is connected with first end of the 12 resistance, the tenth electric capacity and the positive pole of the 9th electric capacity respectively through inductance; Second end of said the 12 resistance is connected to the 5th pin of chip through the 11 resistance; The 5th pin of said chip also is connected and ground connection with the negative pole of the 9th electric capacity, second end of the tenth electric capacity respectively through the tenth resistance, and the 9th electric capacity is parallelly connected with the tenth electric capacity; The tripod of said chip also is connected with the output of commutation circuit through inductance.
5. protective circuit according to claim 1; It is characterized in that; Said first switching circuit comprises the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first triode, and wherein first end of the 6th resistance is connected with first output of control module relatively, second end is connected with first end of the 5th resistance, the 7th resistance respectively; The second end ground connection of said the 5th resistance, second end of the 7th resistance connect the base stage of first triode, and the grounded emitter of said first triode, collector electrode connect the first input end of commutation circuit through the 4th resistance.
6. protective circuit according to claim 1 is characterized in that, said commutation circuit comprises metal-oxide-semiconductor, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 3rd resistance; Wherein first end of second electric capacity is connected with power supply, second end is connected with second end of the 3rd electric capacity and ground connection; First end of said second electric capacity also is connected with first end of the 3rd resistance, the 4th electric capacity respectively, and second end of said the 3rd resistance links to each other with second end of said the 4th electric capacity and is connected with the 4th pin of metal-oxide-semiconductor; First end of said second electric capacity also is connected with first pin of metal-oxide-semiconductor; Said metal-oxide-semiconductor crus secunda, tripod all link to each other with first pin, as the source electrode of metal-oxide-semiconductor; The 5th pin, the 6th pin, the 7th pin all link to each other with octal, as the drain electrode of metal-oxide-semiconductor; The 4th pin is a grid.
7. protective circuit according to claim 6 is characterized in that, said metal-oxide-semiconductor is the P channel MOS tube of single channel enhancement mode.
8. a television set is characterized in that, said television set comprises the described protective circuit of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204585552U CN202334732U (en) | 2011-11-18 | 2011-11-18 | Protection circuit and television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204585552U CN202334732U (en) | 2011-11-18 | 2011-11-18 | Protection circuit and television |
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| CN202334732U true CN202334732U (en) | 2012-07-11 |
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| CN2011204585552U Expired - Fee Related CN202334732U (en) | 2011-11-18 | 2011-11-18 | Protection circuit and television |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135691A (en) * | 2014-08-14 | 2014-11-05 | 广州创维平面显示科技有限公司 | MCU resetting control circuit and TV set |
| CN110535225A (en) * | 2019-09-24 | 2019-12-03 | 深圳市比尔达科技有限公司 | The emergency output circuit and emergency set of built-in point of energy function of band |
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2011
- 2011-11-18 CN CN2011204585552U patent/CN202334732U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135691A (en) * | 2014-08-14 | 2014-11-05 | 广州创维平面显示科技有限公司 | MCU resetting control circuit and TV set |
| CN104135691B (en) * | 2014-08-14 | 2017-12-22 | 广州创维平面显示科技有限公司 | MCU reset control circuits and television set |
| CN110535225A (en) * | 2019-09-24 | 2019-12-03 | 深圳市比尔达科技有限公司 | The emergency output circuit and emergency set of built-in point of energy function of band |
| CN110535225B (en) * | 2019-09-24 | 2024-05-14 | 深圳市比尔达科技有限公司 | Emergency output circuit with built-in energy dividing function and emergency device |
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