CN202495882U - Power supply circuit and television - Google Patents
Power supply circuit and television Download PDFInfo
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- CN202495882U CN202495882U CN2012200977215U CN201220097721U CN202495882U CN 202495882 U CN202495882 U CN 202495882U CN 2012200977215 U CN2012200977215 U CN 2012200977215U CN 201220097721 U CN201220097721 U CN 201220097721U CN 202495882 U CN202495882 U CN 202495882U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model is applicable to the field of electronics, and provides a power supply circuit and a television. The power supply circuit comprises an electromagnetic interference circuit, a first stage rectifying circuit, a main power supply circuit, a standby control circuit, a voltage conversion circuit, a secondary rectifying and filtering circuit and a feedback circuit, wherein the voltage conversion circuit comprises an electronic switch circuit, a main power supply VCC control circuit and a transformer. The power supply circuit adopts a brand new topological structure, thereby solving a short circuit fault existed in the prior art and a problem that the television is burned by fire caused by an automatic rising of the voltage in a standby mode, and improving safety performance of a power supply.
Description
Technical field
The utility model belongs to electronic applications, relates in particular to a kind of power circuit.
Background technology
Along with the development of LCD TV with popularize, increasing consumer is with the first-selection of TV as the audiovisual media, and the LCD TV safety standard is also constantly improving simultaneously, and power supply is one of most important safety component of LCD TV.
At present; TV power supply circuit commonly used includes elementary arrangement filter circuit, main power circuit, readiness control circuit and main power source VCC control switching circuit etc.; When the TV operate as normal, said main power source VCC control switching circuit is that main power circuit provides stable supply power voltage, and when normal standby; Said main power source VCC control switching circuit is output as zero, and main power circuit is not worked.Figure is as shown in Figure 1 for prior art main power source VCC control switching circuit; When 2 short circuits of second capacitor C, the 3rd triode Q3 emitter is equivalent to shorted to earth, and the electric current between collector electrode and the emitter increases thereupon; Because the metering function of the second triode Q2; Cause and to make switching mode power supply transformer reach degree of depth overload protection (said transformer does not draw, and said primary winding crus secunda is connected with the anode of the first diode D1, and said transformer first pin is connected with the negative pole of first capacitor C 1 and ground connection) in Fig. 1; The second triode Q2 can be in saturation conduction district and the conversion of linear amplification district; Because the second triode Q2 is very big in the loss of linear amplification region, through after a while, temperature can be assembled rising and caused the baked wheaten cake machine; If when power circuit is in normal standby, Opportunity awaiting control for linear signal ON/OFF is a low level, and the first triode Q1 ends; The light-emitting diode of photoelectrical coupler P1 also ends, and the phototriode of photoelectrical coupler P1 is not worked yet, and the second triode Q2, the 3rd triode Q3 all end simultaneously; The output of the 3rd triode Q3 emitter no-voltage, the voltage on first capacitor C 1 can not form effective loop, and first capacitor C, 1 cathode voltage slowly raises; The second triode Q2 damages when causing easily starting shooting once more; And form the baked wheaten cake machine, so there is potential safety hazard in prior art, need to improve.
The utility model content
The purpose of the utility model is to provide a kind of power circuit, the voltage problem of the baked wheaten cake machine that causes that raises automatically when being intended to solve short trouble in the prior art and standby.In order to solve the problems of the technologies described above, the utility model adopts following scheme to be achieved:
A kind of power circuit comprises electromagnetic interference circuit, first order rectification circuit, main power circuit, readiness control circuit, secondary commutation filter circuit and feedback circuit; The first input end of said electromagnetic interference circuit and second input connect power input respectively; Output is connected with the input of first order rectification circuit; First output of said first order rectification circuit is connected with the first input end of main power circuit, and said power circuit also comprises:
Be used for standby output, control the voltage conversion circuit that the main power circuit supply power voltage also can be realized short-circuit protection; First and second input of said voltage conversion circuit is connected with second output of first order rectification circuit, the output of readiness control circuit respectively, and first, second and third output is connected with the input of secondary commutation filter circuit, second input of main power circuit, the first input end of readiness control circuit respectively; First output of said secondary commutation filter circuit is connected with the input of feedback circuit as standby output, second output, and the output of said feedback circuit is connected with second input of readiness control circuit.
Further, said voltage conversion circuit comprises electronic switching circuit, main power source VCC control circuit and transformer;
The 5th pin of said primary winding is the first input end of said voltage conversion circuit; The 4th pin of said primary winding is second input of said voltage conversion circuit; The tenth pin of said transformer secondary output winding is first output of said voltage conversion circuit; The tripod of said primary winding is the 3rd output of said voltage conversion circuit; First pin of said primary winding is connected ground connection with main power source VCC control circuit, and the crus secunda of said primary winding is connected with the 3rd input of main power source VCC control circuit; The first input end of said main power source VCC control circuit, second input are connected with first output, second output of electronic switching circuit respectively, and the output of said main power source VCC control circuit is second output of said voltage conversion circuit; Said electronic switching circuit first input end connection+5V power supply power supply branch road, second input are connected with the Opportunity awaiting control for linear signal.
Further, said main power source VCC control circuit comprises first diode, voltage stabilizing didoe, photoelectrical coupler, second triode, the 3rd triode, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first electric capacity, second electric capacity;
The anode of wherein said first diode is connected with the crus secunda of transformer, negative electrode is connected with the positive pole of first electric capacity; The negative pole of said first electric capacity is connected with first pin of said transformer and ground connection, and the anode of said first diode also is connected with first end of the 4th resistance, first end of the 5th resistance and the collector electrode of the 3rd triode respectively; Second end of said the 4th resistance is connected with the tripod of photoelectrical coupler; First pin of said photoelectrical coupler, crus secunda are respectively first input end, second input of main power source VCC control circuit; The 4th pin is connected with the base stage of second triode, first end of the 7th resistance respectively through the 6th resistance; The collector electrode of said second triode is connected with second end of the 5th resistance, emitter is connected with the base stage of the 3rd triode, the negative electrode of voltage stabilizing didoe respectively; The emitter of said the 3rd triode is connected the output as main power source VCC control circuit with the positive pole of second electric capacity, and the negative pole of second electric capacity is connected and ground connection with the anode of voltage stabilizing didoe, second end of the 7th resistance respectively.
Further, said electronic switching circuit comprises first resistance, second resistance, the 3rd resistance, first triode;
The base stage of wherein said first triode is connected with first end of second resistance, emitter is connected with second end of second resistance and ground connection, current collection first output of electronic switching circuit very, and the base stage of first triode also is connected with the Opportunity awaiting control for linear signal through first resistance; One termination of said the 3rd resistance+5V power supply power supply branch road, the other end are second output of electronic switching circuit.
Further, said second triode, the 3rd triode are NPN type triode.
Further, said first electric capacity, second electric capacity are polar capacitor.
Another purpose of the utility model also provides the television set with above-mentioned power circuit.
The power circuit that the utility model provides has adopted brand-new topological structure, and the voltage problem of the baked wheaten cake machine that causes that raises automatically when having solved prior art short trouble and standby has improved the security performance of power supply.
Description of drawings
Fig. 1 is prior art main power source VCC control switching circuit figure;
Fig. 2 is the circuit construction of electric power theory diagram that the utility model provides;
Fig. 3 is the concrete circuit connection diagram of power 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. 2 shows the circuit construction of electric power theory diagram that the utility model provides, and details are as follows:
A kind of power circuit comprises electromagnetic interference circuit 11, first order rectification circuit 12, main power circuit 13, readiness control circuit 14, secondary commutation filter circuit 16 and feedback circuit 17; The first input end of said electromagnetic interference circuit 11 and second input connect power input respectively; Output is connected with the input of first order rectification circuit 12; First output of said first order rectification circuit 12 is connected with the first input end of main power circuit, and said power circuit also comprises:
Be used for standby output, control the voltage conversion circuit 15 that the main power circuit supply power voltage also can be realized short-circuit protection; First and second input of said voltage conversion circuit 15 is connected with second output of first order rectification circuit 12, the output of readiness control circuit 14 respectively, and first, second and third output is connected with the input of secondary commutation filter circuit 16, second input of main power circuit 13, the first input end of readiness control circuit 14 respectively; First output of said secondary commutation filter circuit 16 is connected with the input of feedback circuit 17 as standby output, second output, and the output of said feedback circuit 17 is connected with second input of readiness control circuit 14.
Fig. 3 is the concrete circuit connection diagram of power circuit that the utility model provides, and details are as follows:
The concrete circuit connection diagram of this power circuit comprises electromagnetic interference circuit 11, first order rectification circuit 12, main power circuit 13, readiness control circuit 14, voltage conversion circuit 15, secondary commutation filter circuit 16 and feedback circuit 17; Wherein said voltage conversion circuit 15 also comprises electronic switching circuit 101, main power source VCC control circuit 102 and transformer T1.
The 5th pin of the elementary winding of said transformer T1 is the first input end of said voltage conversion circuit 15; The 4th pin of the elementary winding of said transformer T1 is second input of said voltage conversion circuit 15; The tenth pin of said transformer T1 secondary winding is first output of said voltage conversion circuit 15; The tripod of the elementary winding of said transformer T1 is the 3rd output of said voltage conversion circuit 15; First pin of the elementary winding of said transformer T1 is connected ground connection with main power source VCC control circuit 102, and the crus secunda of the elementary winding of said transformer T1 is connected with the 3rd input of main power source VCC control circuit 102; The first input end of said main power source VCC control circuit 102, second input are connected with first output, second output of electronic switching circuit 101 respectively, and the output of said main power source VCC control circuit 102 is second output of said voltage conversion circuit 15; Said electronic switching circuit 101 first input end connection+5V power supplys power supply branch road, second input are connected with Opportunity awaiting control for linear signal ON/OFF.
Said main power source VCC control circuit 102 comprises the first diode D1, voltage stabilizing didoe ZD1, photoelectrical coupler P1, the second triode Q2, the 3rd triode Q3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, first capacitor C 1, second capacitor C 2;
The anode of the wherein said first diode D1 is connected with the crus secunda of transformer T1, negative electrode is connected with the positive pole of first capacitor C 1; The negative pole of said first capacitor C 1 is connected with first pin of said transformer T1 and ground connection, and the anode of the said first diode D1 also is connected with first end of the 4th resistance R 4, first end of the 5th resistance R 5 and the collector electrode of the 3rd triode Q3 respectively; Second end of said the 4th resistance R 4 is connected with the tripod of photoelectrical coupler P1; First pin of said photoelectrical coupler P1, crus secunda are respectively first input end, second input of main power source VCC control circuit 102; The 4th pin is connected with the base stage of the second triode Q2, first end of the 7th resistance R 7 respectively through the 6th resistance R 6; The collector electrode of the said second triode Q2 is connected with second end of the 5th resistance R 5, emitter is connected with the base stage of the 3rd triode Q3, the negative electrode of voltage stabilizing didoe ZD1 respectively; The emitter of said the 3rd triode Q3 is connected the output as main power source VCC control circuit 102 with the positive pole of second capacitor C 2, and the negative pole of second capacitor C 2 is connected and ground connection with the anode of voltage stabilizing didoe ZD1, second end of the 7th resistance R 7 respectively; Wherein the second triode Q2, the 3rd triode Q3 are NPN type triode.
Said electronic switching circuit 101 comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the first triode Q1;
The base stage of the wherein said first triode Q1 is connected with first end of second resistance R 2, emitter is connected with second end of second resistance R 2 and ground connection, current collection first output of electronic switching circuit 101 very, and the base stage of the first triode Q1 also is connected with Opportunity awaiting control for linear signal ON/OFF through first resistance R 1; One termination of said the 3rd resistance R 3+5V power supply power supply branch road, the other end are second output of electronic switching circuit 101; Wherein the first triode Q1 is a NPN type triode.
The power circuit operation principle: alternating current gets into from power input; 11 pairs of alternating currents of electromagnetic interference circuit carry out electromagnetic interference to be suppressed; First order rectification circuit 12 is a direct current with AC rectification; Voltage conversion circuit 15 converts the direct current of first order rectification circuit 12 rectifications to alternating current, and through secondary commutation filter circuit 16 output standby voltages, and feedback circuit 17 will feed back to readiness control circuit 14 through the voltage sampling of level rectification circuit 16 outputs; Main power source VCC control circuit 102 provides stable voltage output for main power voltage simultaneously; When power circuit was in normal standby, voltage conversion circuit 15 second output end voltages were zero, and main power circuit is not worked.
The operation principle of voltage conversion circuit 15:
During the power circuit operate as normal, Opportunity awaiting control for linear signal ON/OFF is a high level, the first triode Q1 conducting; The first pin voltage that is photoelectrical coupler P1 drags down, and the crus secunda of photoelectrical coupler P1 connects+5V power supply power supply branch road, after the 3rd resistance R 3 current limlitings; Electric current flows through the light-emitting diode of photoelectrical coupler P1 to ground; Lumination of light emitting diode, according to the characteristic of photoelectrical coupler P1, its phototriode saturation conduction; Then the second triode Q2 and the 3rd diode Q3 conducting are in succession exported stable voltage simultaneously and are offered main power circuit 13.
Main power source VCC control circuit 102 is realized the operation principle of short-circuit protection:
Because the 3rd triode Q3 is NPN type triode, as long as the base voltage of the 3rd triode Q3 is greater than 0.6V, just conducting always between collector electrode and the emitter.
During the power circuit operate as normal; When 2 short circuits of second capacitor C; The 3rd triode Q3 emitter is equivalent to shorted to earth, and the electric current between collector electrode and the emitter increases thereupon, on the first diode D1, forms big electric current and makes transformer T1 reach the protection purpose of degree of depth overload; Simultaneously since between the collector electrode of the 3rd triode Q3 and the emitter pressure drop very low, the temperature rise of formation is very low, has prevented that 2 short circuits of second capacitor C from causing the problem of baked wheaten cake machine.
When power circuit was in normal standby, Opportunity awaiting control for linear signal ON/OFF was a low level, and the first triode Q1 ends; The light-emitting diode of photoelectrical coupler P1 also ends; The phototriode of photoelectrical coupler P1 is not worked yet, and the second triode Q2, the 3rd triode Q3 all end simultaneously, and the phototriode of photoelectrical coupler P1 is connected with the positive pole of first capacitor C 1 through the 4th resistance R 4; When first capacitor C, 1 charging voltage height arrives certain voltage value; The phototriode of photoelectrical coupler P1 can the moment conducting cause the base stage of the second triode Q2 that voltage formation work is arranged, and the undertension of work is so that the 3rd triode Q3 operate as normal is final
Get back to ground wire through the internal resistance of voltage stabilizing didoe ZD1 and constitute a loop, thereby capacitor C 1 voltage of winning is settled out, form the voltage stabilizing circuit of a pincers-pressed type, the problem that voltage raises automatically when having solved standby.
The power circuit that the utility model provides has adopted brand-new topological structure, and the voltage problem of the baked wheaten cake machine that causes that raises automatically when having solved prior art short trouble and standby has improved the security performance of power supply.
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 (7)
1. a power circuit comprises electromagnetic interference circuit, first order rectification circuit, main power circuit, readiness control circuit, secondary commutation filter circuit and feedback circuit; The first input end of said electromagnetic interference circuit and second input connect power input respectively; Output is connected with the input of first order rectification circuit; First output of said first order rectification circuit is connected with the first input end of main power circuit; It is characterized in that said power circuit also comprises:
Be used for standby output, control the voltage conversion circuit that the main power circuit supply power voltage also can be realized short-circuit protection; First and second input of said voltage conversion circuit is connected with second output of first order rectification circuit, the output of readiness control circuit respectively, and first, second and third output is connected with the input of secondary commutation filter circuit, second input of main power circuit, the first input end of readiness control circuit respectively; First output of said secondary commutation filter circuit is connected with the input of feedback circuit as standby output, second output, and the output of said feedback circuit is connected with second input of readiness control circuit.
2. power circuit according to claim 1 is characterized in that said voltage conversion circuit comprises electronic switching circuit, main power source VCC control circuit and transformer;
The 5th pin of said primary winding is the first input end of said voltage conversion circuit; The 4th pin of said primary winding is second input of said voltage conversion circuit; The tenth pin of said transformer secondary output winding is first output of said voltage conversion circuit; The tripod of said primary winding is the 3rd output of said voltage conversion circuit; First pin of said primary winding is connected ground connection with main power source VCC control circuit, and the crus secunda of said primary winding is connected with the 3rd input of main power source VCC control circuit; The first input end of said main power source VCC control circuit, second input are connected with first output, second output of electronic switching circuit respectively, and the output of said main power source VCC control circuit is second output of said voltage conversion circuit; Said electronic switching circuit first input end connection+5V power supply power supply branch road, second input are connected with the Opportunity awaiting control for linear signal.
3. power circuit according to claim 2; It is characterized in that said main power source VCC control circuit comprises first diode, voltage stabilizing didoe, photoelectrical coupler, second triode, the 3rd triode, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first electric capacity, second electric capacity;
The anode of wherein said first diode is connected with the crus secunda of transformer, negative electrode is connected with the positive pole of first electric capacity; The negative pole of said first electric capacity is connected with first pin of said transformer and ground connection, and the anode of said first diode also is connected with first end of the 4th resistance, first end of the 5th resistance and the collector electrode of the 3rd triode respectively; Second end of said the 4th resistance is connected with the tripod of photoelectrical coupler; First pin of said photoelectrical coupler, crus secunda are respectively first input end, second input of main power source VCC control circuit; The 4th pin is connected with the base stage of second triode, first end of the 7th resistance respectively through the 6th resistance; The collector electrode of said second triode is connected with second end of the 5th resistance, emitter is connected with the base stage of the 3rd triode, the negative electrode of voltage stabilizing didoe respectively; The emitter of said the 3rd triode is connected the output as main power source VCC control circuit with the positive pole of second electric capacity, and the negative pole of second electric capacity is connected and ground connection with the anode of voltage stabilizing didoe, second end of the 7th resistance respectively.
4. power circuit according to claim 2 is characterized in that, said electronic switching circuit comprises first resistance, second resistance, the 3rd resistance, first triode;
The base stage of wherein said first triode is connected with first end of second resistance, emitter is connected with second end of second resistance and ground connection, current collection first output of electronic switching circuit very, and the base stage of first triode also is connected with the Opportunity awaiting control for linear signal through first resistance; One termination of said the 3rd resistance+5V power supply power supply branch road, the other end are second output of electronic switching circuit.
5. power circuit according to claim 3 is characterized in that, said second triode, the 3rd triode are NPN type triode.
6. power circuit according to claim 3 is characterized in that, said first electric capacity, second electric capacity are polar capacitor.
7. a television set is characterized in that, said television set comprises like each described power circuit among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200977215U CN202495882U (en) | 2012-03-15 | 2012-03-15 | Power supply circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200977215U CN202495882U (en) | 2012-03-15 | 2012-03-15 | Power supply circuit and television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495882U true CN202495882U (en) | 2012-10-17 |
Family
ID=47002094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200977215U Expired - Lifetime CN202495882U (en) | 2012-03-15 | 2012-03-15 | Power supply circuit and television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202495882U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068452A1 (en) * | 2016-10-11 | 2018-04-19 | 深圳创维－Rgb电子有限公司 | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| CN111697848A (en) * | 2019-03-12 | 2020-09-22 | 海信视像科技股份有限公司 | Display device and power supply control method |
-
2012
- 2012-03-15 CN CN2012200977215U patent/CN202495882U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018068452A1 (en) * | 2016-10-11 | 2018-04-19 | 深圳创维－Rgb电子有限公司 | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| US10554922B2 (en) | 2016-10-11 | 2020-02-04 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Method for reducing power consumption of power supply, power supply automatically reducing power consumption, and television |
| CN111697848A (en) * | 2019-03-12 | 2020-09-22 | 海信视像科技股份有限公司 | Display device and power supply control method |
| CN111697848B (en) * | 2019-03-12 | 2021-09-07 | 海信视像科技股份有限公司 | Display device and power supply control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |
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| CX01 | Expiry of patent term |