CN202633902U - Power failure protecting circuit for television set - Google Patents
Power failure protecting circuit for television set Download PDFInfo
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- CN202633902U CN202633902U CN 201220295782 CN201220295782U CN202633902U CN 202633902 U CN202633902 U CN 202633902U CN 201220295782 CN201220295782 CN 201220295782 CN 201220295782 U CN201220295782 U CN 201220295782U CN 202633902 U CN202633902 U CN 202633902U
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- power supply
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Abstract
The utility model relates to a power failure protecting circuit for a power supply of a television set, in particular to an alternating-current power failure quick unlocking and protecting circuit for a switching power supply of a television set. The power failure protecting circuit for the power supply of the television set comprises an alternating-current power supply input end, a rectification and voltage division module, a delay control module, a chip power supply end and a direct-current output voltage control chip feedback end, wherein the alternating-current power supply input end is connected with the rectification and voltage division module; the delay control module is connected with the rectification and voltage division module, the chip power supply end and the direct-current output voltage control chip feedback end respectively. The power failure protecting circuit for the power supply of the television set is characterized by also comprising a discharge resetting module which is connected with the delay control module and the chip power supply end respectively. The power failure protecting circuit for the power supply of the television set has the advantages that the reliability and the stability of a power supply circuit can be effectively improved, power consumption is not increased, and the power failure protecting circuit for the power supply of the television set is simple in structure and easy to realize. The power failure protecting circuit for the power supply of the television set is particularly suitable for the power supply circuit of the television set.
Description
Technical field
The utility model relates to a kind of TV set power power down protection circuit, relates to a kind of television set Switching Power Supply specifically and exchanges power down quick release protective circuit.
Background technology
Present TV set power exchanges in the down circuit; The safeguard measure that adopts is when exchanging power down; Detect on the ac line or the point on the rectifier bridge π type filtration module; Make when exchanging power down, VD control chip feedback end is pulled down to ground, turn-off chip drives output to a certain voltage.But the shortcoming of sort circuit is: after VD control chip feedback end is pulled down to ground; Residual voltage can not get timely release on the big electric capacity of power end; Power supply after energising finishes is after removing alternating current, and residual voltage possibly damage to the power circuit device and to the engineering staff that possibly contact power supply on the big electric capacity of power end.What the protected mode of some power circuits adopted at present is locked (like overvoltage protection); Power supply need be closed to exchange and imported the releasing that once just can power on afterwards; Just need carry out the release of high-speed switch machine, therefore need add the high speed release circuit, the problem of bringing cost to increase.Sort circuit drags down VD control chip feedback end simultaneously, has closed chip output, and chip VCC electric capacity does not have discharge resistance; The last voltage of VCC can be kept a very long time; Or be reduced to 0 rapidly (chip VCC high voltage startup is put into the ac line rectifier diode to the terminal of electric capacity charging detects, exchange no-voltage after the power down, VCC is reduced to 0 rapidly); Make the voltage on the big electric capacity of power end not have any path of releasing; Thereby after causing for a long time, still remaining very high voltage brings potential safety hazard on the big electric capacity of power end.
The utility model content
The utility model technical problem to be solved; The problem that in time discharges to residual voltage on the big electric capacity that can not realize chip quick release and power end of existing TV set power protective circuit existence exactly proposes a kind of new TV set power power down protection circuit.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: TV set power power down protection circuit; Comprise ac power input end, rectification and voltage division module, time-delay control module, chip power end and VD control chip feedback end; Said ac power input end is connected with the rectification and voltage division module; Said time-delay control module is connected with rectification and voltage division module, chip power end and VD control chip feedback end respectively; It is characterized in that, also comprise the discharge reduction module, said discharge reduction module is connected with the chip power end with the time-delay control module respectively.
Further, said discharge reduction module comprises resistance and switching tube, and an end of said resistance is connected with the chip power end, the other end is connected with an end of switching tube, and the excitation end of said switching tube is connected with the time-delay control module, other end ground connection.
Further, said switching tube is a field-effect transistor, and the grid of said field-effect transistor is connected with the time-delay control module, drain electrode is connected with resistance, source ground.
The beneficial effect of the utility model does, can realize the timely release of residual voltage on the big electric capacity of chip quick release and power end, effectively improves the reliability and stability of power circuit, can not increase power consumption simultaneously, have simple in structure, the advantage that is easy to realize.
Description of drawings
Fig. 1 is the logic diagram of the utility model;
Fig. 2 is the circuit theory diagrams of embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment, describe the technical scheme of the utility model in detail:
As shown in Figure 1; The TV set power power down protection circuit of the utility model; Comprise ac power input end, rectification and voltage division module, time-delay control module, chip power end, VD control chip feedback end and discharge reduction module; Wherein ac power input end is connected with the rectification and voltage division module; The time-delay control module is connected with rectification and voltage division module, chip power end and VD control chip feedback end respectively, and the discharge reduction module is connected with the chip power end with the time-delay control module respectively.Realize the timely release of residual voltage on the big electric capacity of chip quick release and power end through the discharge reduction module, thereby effectively improve the reliability and stability of circuit.
A kind of concrete discharge reduction module implementation method is for including resistance and switching tube, and an end of said resistance is connected with the chip power end, the other end is connected with an end of switching tube, and the excitation end of said switching tube is connected with the time-delay control module, other end ground connection.Resistance is connected with the chip power end, and grounding through resistance can be realized the release of voltage after being communicated with when switching tube, reaches the purpose of discharge reduction.
Further, a kind of preferred implementation, switching tube is a field-effect transistor, the grid of said field-effect transistor is connected with the time-delay control module, drain electrode is connected with resistance, source ground.The field-effect transistor technology maturation can effectively improve the reliability of circuit herein as switching tube, the device with switching function that certainly adopts triode or other to be easy to expect is realized identical functions.
Embodiment:
As shown in Figure 2; This routine TV set power power down protection circuit comprises AC input, the first diode D1, the second diode D 2, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, first capacitor C 1, second capacitor C 2, the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the 3rd metal-oxide-semiconductor Q3, chip power end VCC and VD control chip feedback end, and wherein the 8th resistance R 8 and the 3rd metal-oxide-semiconductor Q3 are the discharge reduction module;
The AC input is connected with the positive pole of the first diode D1; The negative pole of the first diode D1 is connected with an end of first resistance R 1; The other end of first resistance R 1 is connected with an end of second resistance R 2; The other end of second resistance R 2 is connected with an end of the 3rd resistance R 3; The other end of the 3rd resistance R 3 is connected with an end of the 4th resistance R 4 and the positive pole of the second diode D2; The negative pole of the second diode D2 is connected with an end of first capacitor C 1 and an end of the 5th resistance R 5, and the other end of the 5th resistance R 5 is connected with the grid of the 6th resistance R 6 and the first metal-oxide-semiconductor Q1, and the drain electrode of first metal-oxide-semiconductor is connected with an end of second capacitor C 2, the grid of the second metal-oxide-semiconductor Q2, an end of the 7th resistance R 7, the grid of the 3rd metal-oxide-semiconductor Q3; The drain electrode of the second metal-oxide-semiconductor Q2 is connected with VD control chip feedback end; The other end of the 7th resistance R 7 is connected with an end of the 8th resistance R 8 with VCC, and the other end of the 8th resistance R 8 is connected with the drain electrode of the 3rd metal-oxide-semiconductor Q3, the other end of the source electrode of the source electrode of the source electrode of the 3rd metal-oxide-semiconductor, second metal-oxide-semiconductor, the other end of second capacitor C 2, first metal-oxide-semiconductor, the other end of the 6th resistance R 6, first capacitor C 1, the equal ground connection of the other end of the 4th resistance R 4.
This routine operation principle is: the sampled signal of the alternating voltage of AC input is after the first diode D1 rectification; Through the bleeder circuit rectification once more that the second diode D2, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 are formed, first capacitor C 1 and the 5th resistance R 5 are connected on the negative pole of the second diode D2 respectively, and the other end of the 5th resistance R 5 is received the grid of the first metal-oxide-semiconductor Q1 and carried out the branch pressure-controlled with 6 couples first metal-oxide-semiconductor Q1 of the 6th resistance R; The effect of first capacitor C 1 is that its stored voltage can be kept lasting conducting a period of time of the first metal-oxide-semiconductor Q1 when exchanging power down; Just can control when exchanging power down the output of direct voltage and when turn-off through regulating first capacitor C 1, the value of first capacitor C 1 is big more, and exchanging after the power down VD control chip feedback end, to be dragged down the needed time just long more; The grid of the second metal-oxide-semiconductor Q2 is connected with ground wire through second capacitor C 2; Its effect is to be used for setting the time that powers on once more when power down is removed, through to the voltage detecting behind the AC-input voltage rectifying and wave-filtering, and detection electric power thus supplied that can be reliable; Power-down state in this way; Then the second diode D2 by, make the first not conducting of metal-oxide-semiconductor Q1, and then the 2nd MO closes pipe Q2 conducting; Will drag down VD control chip feedback end this moment, thereby make corresponding direct voltage no-output.When AC dump; After VD control chip feedback end is pulled down to ground; The voltage of VCC is kept the 3rd metal-oxide-semiconductor Q3 conducting; Release energy through the 8th resistance R 8, in time discharge VCC voltage, can use two resistance parallel connections to replace the 8th resistance R 8 when energy is big in the side circuit to enough little numerical value.After testing, increasing this discharge reduction circuit, can realize quick alternating-current switch machine, and the voltage of the big electric capacity of power end is discharged into below the 6V, can improve circuit reliability and eliminate the high-tension potential safety hazard of bringing.
Claims (3)
1. TV set power power down protection circuit; Comprise ac power input end, rectification and voltage division module, time-delay control module, chip power end and VD control chip feedback end; Said ac power input end is connected with the rectification and voltage division module; Said time-delay control module is connected with rectification and voltage division module, chip power end and VD control chip feedback end respectively; It is characterized in that, also comprise the discharge reduction module, said discharge reduction module is connected with the chip power end with the time-delay control module respectively.
2. TV set power power down protection circuit according to claim 1; It is characterized in that; Said discharge reduction module comprises resistance and switching tube; One end of said resistance is connected with the chip power end, the other end is connected with an end of switching tube, and the excitation end of said switching tube is connected with the time-delay control module, other end ground connection.
3. TV set power power down protection circuit according to claim 2 is characterized in that said switching tube is a field-effect transistor, and the grid of said field-effect transistor is connected with the time-delay control module, drain electrode is connected with resistance, source ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220295782 CN202633902U (en) | 2012-06-21 | 2012-06-21 | Power failure protecting circuit for television set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220295782 CN202633902U (en) | 2012-06-21 | 2012-06-21 | Power failure protecting circuit for television set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202633902U true CN202633902U (en) | 2012-12-26 |
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ID=47387048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220295782 Expired - Lifetime CN202633902U (en) | 2012-06-21 | 2012-06-21 | Power failure protecting circuit for television set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202633902U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322930A (en) * | 2015-12-02 | 2016-02-10 | 上海航空电器有限公司 | Short-time power down retaining circuit for direct-current solid-state power controller |
| CN107948555A (en) * | 2017-12-25 | 2018-04-20 | Tcl通力电子（惠州）有限公司 | Switch control circuit and television |
-
2012
- 2012-06-21 CN CN 201220295782 patent/CN202633902U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322930A (en) * | 2015-12-02 | 2016-02-10 | 上海航空电器有限公司 | Short-time power down retaining circuit for direct-current solid-state power controller |
| CN107948555A (en) * | 2017-12-25 | 2018-04-20 | Tcl通力电子（惠州）有限公司 | Switch control circuit and television |
| CN107948555B (en) * | 2017-12-25 | 2021-02-23 | Tcl通力电子（惠州）有限公司 | Switch control circuit and television |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220127 Address after: 621000, No. 35 Mian Xing Dong Road, hi tech Zone, Sichuan, Mianyang Patentee after: SICHUAN CHANGHONG PRECISION ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 628017 Sichuan Changhong Xinrui Technology Co., Ltd., wangjiaying urban industrial park, Guangyuan Economic Development Zone, Sichuan Province Patentee before: SICHUAN CHANGHONG-SINEW TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |