CN201937248U - Self-locking protective circuit for switch power supply - Google Patents
Self-locking protective circuit for switch power supply Download PDFInfo
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- CN201937248U CN201937248U CN2010206739705U CN201020673970U CN201937248U CN 201937248 U CN201937248 U CN 201937248U CN 2010206739705 U CN2010206739705 U CN 2010206739705U CN 201020673970 U CN201020673970 U CN 201020673970U CN 201937248 U CN201937248 U CN 201937248U
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Abstract
The utility model relates to a protective circuit for a switch power supply, in particular to a self-locking protective circuit for the switch power supply and resolves the problem existing in prior art that a power supply needs immediately to enter into a protective state and be locked in abnormal conditions. The self-locking protective circuit for the switch power supply avoids damage caused by the power supply working for a long time under abnormal conditions. The protective circuit comprises a trigger circuit, an optocoupler circuit and an interlock circuit, wherein the trigger circuit, the optocoupler circuit and the interlock circuit are sequentially connected with each other in an electric mode. The protective circuit is applied to switch power supply protection.
Description
Technical field
The utility model relates to a kind of protective circuit of switch power source, particularly relates to a kind of Switching Power Supply self-lock protection circuit.
Background technology
The panel TV Switching Power Supply comprises LCD power supply, PDP power supply, LED power supply, and is along with panel TV slimming, development that dull and stereotyped power supply power consumption is more and more littler, under this development trend, more and more higher to promptness, the reliability requirement of power protecting circuit.Switching Power Supply is the source that continual and steady work is provided for panel TV equipment; in case unusual condition appears in power supply; needing power supply to enter guard mode immediately and continue locks; allow power supply not work; overhaul up to the staff and to enter operating state again after getting rid of unusual condition, avoid power supply under unusual condition, to work long hours occurring infringement the mankind and property thereof.
The utility model content
The technical solution adopted in the utility model is to solve when abnormal conditions appear in power supply in the prior art; the problem that needs power supply to enter guard mode immediately and need to lock; provide a kind of Switching Power Supply self-lock protection circuit, the harm of avoiding power supply under unusual condition, to work long hours and bring.
For achieving the above object, the technical solution adopted in the utility model is.
A kind of Switching Power Supply self-lock protection circuit comprises circuits for triggering, photoelectric coupled circuit, interlock circuit, and described circuits for triggering, described photoelectric coupled circuit, described interlock circuit are electrically connected in proper order.
Described circuits for triggering input is as Switching Power Supply self-lock protection circuit input end, and described Switching Power Supply self-lock protection circuit input end is electrically connected with described triggering signal.
Described interlock circuit output is as Switching Power Supply self-lock protection circuit output end, and described Switching Power Supply self-lock protection circuit output end is electrically connected with described feedback signal terminal FB.
Described photoelectric coupled circuit comprises optocoupler U1, the 6th resistance R 6, optocoupler supply power voltage V, wherein said optocoupler U1 first pin is electrically connected with described the 6th resistance R 6 one ends, described the 6th resistance R 6 other ends are electrically connected with described optocoupler supply power voltage end, described optocoupler U1 second pin is electrically connected with described circuits for triggering, and described optocoupler U1 three-prong, described optocoupler U1 the 4th pin are electrically connected with described interlock circuit respectively.
Described circuits for triggering comprise the 3rd triode Q3, second capacitor C 2, the 7th resistance R 7, the 8th resistance R 8, wherein said the 7th resistance R 7 one end in contact are signaled, described second capacitor C, 2 one ends, described the 8th resistance R 8 one ends, described the 7th resistance R 7 other ends, described the 3rd triode Q3 base stage end points altogether are electrically connected, described second capacitor C, 2 other ends, described the 8th resistance R 8 other ends, described the 3rd triode Q3 emitting stage are electrically connected altogether, and described the 3rd triode Q3 collector electrode is electrically connected with described optocoupler U1 second pin.
Described interlock circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, first capacitor C 1, the 3rd capacitor C 3, diode D1, the first triode Q1, the second triode Q2, power supply VCC, wherein said optocoupler U1 the 4th pin is electrically connected with described second resistance R, 2 one ends, described second resistance R, 2 other ends, the described second triode Q2 emitter, described power supply VCC end points altogether is electrically connected, described first resistance R, 1 one ends, described first capacitor C, 1 one ends are electrically connected with described power end VCC respectively, described first resistance R, 1 other end, described first capacitor C, 1 other end, the described second triode Q2 base stage, described the 5th resistance R 5 one ends are electrically connected, the described second triode Q2 collector electrode, described the 4th resistance R 4 one ends are electrically connected, described the 4th resistance R 4 other ends are electrically connected with the described first triode Q1 base stage, described the 3rd capacitor C 3 one ends, described the 3rd resistance R 3 one ends are electrically connected with the described first triode Q1 base stage respectively, described the 3rd capacitor C 3 other ends are connected with the described first triode Q1 emitting stage respectively altogether with described the 3rd resistance R 3 other ends, described the 5th resistance R 5 other ends respectively with described diode D1 negative electrode, the described first triode Q1 collector electrode is electrically connected, and described diode D1 anode is electrically connected with described feedback signal terminal FB.
From above-mentioned architectural feature of the present utility model as can be seen, its advantage is.
In the high speed latching circuit of the present utility model; when unusual conditions such as overvoltage, overload occurring at power supply; triggering signal is put height; and be input in the high speed self-lock protection circuit of the Switching Power Supply that the utility model provides; adjusting by high speed self-lock protection circuit; make the FB pin voltage of power supply control chip continue to put low; power supply control chip is not worked; no-output; be in the lock state start again again after trouble shooting, power supply operate as normal; the interlock circuit release, the power supply of power supply control chip FB pin is normal.This circuit is as long as optocoupler is triggered, and circuit just can move immediately, has guaranteed timely, the validity of protective circuit.The utility model circuit structure is simple, is easy to realize.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.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.
The high speed self-lock protection circuit of a kind of Switching Power Supply that the utility model provides; output voltage and electric current to power supply detects in the course of the work; when overvoltage appears in power supply; during unusual conditions such as overload; triggering signal is put height; and be input in the high speed self-lock protection circuit of the Switching Power Supply that the utility model provides; adjusting by high speed self-lock protection circuit; make the FB pin voltage of power supply control chip continue to put low; make power supply control chip not be damaged, do not work, no-output; be in the lock state; normal up to power supply output, the latching circuit release, the power supply of power supply control chip FB pin is normal.This device is avoided because power supply when fault is not got rid of, during unusual conditions such as the overvoltage that occurs in the power supply restarting process, overload, damages the miscellaneous equipment that power supply control chip and power output end connect.
Preferred embodiment
As shown in Figure 1; a kind of Switching Power Supply high speed self-lock protection circuit; comprise circuits for triggering, photoelectric coupled circuit, interlock circuit; circuits for triggering, photoelectric coupled circuit, interlock circuit are electrically connected in proper order; the circuits for triggering input is as Switching Power Supply self-lock protection circuit input end; Switching Power Supply self-lock protection circuit input end is electrically connected with triggering signal, and the interlock circuit output is as Switching Power Supply self-lock protection circuit output end, and Switching Power Supply self-lock protection circuit output end is electrically connected with feedback signal terminal FB.
Photoelectric coupled circuit comprises optocoupler U1, the 6th resistance R 6, optocoupler supply power voltage V, wherein optocoupler U1 first pin is electrically connected with the 6th resistance R 6 one ends, the 6th resistance R 6 other ends are electrically connected with optocoupler supply power voltage end, optocoupler U1 second pin is electrically connected with circuits for triggering, and optocoupler U1 three-prong, optocoupler U1 the 4th pin are electrically connected with interlock circuit respectively.
Circuits for triggering comprise the 3rd triode Q3, second capacitor C 2, the 7th resistance R 7, the 8th resistance R 8, wherein the 7th resistance R 7 one end in contact are signaled, second capacitor C, 2 one ends, the 8th resistance R 8 one ends, the 7th resistance R 7 other ends, the 3rd triode Q3 base stage end points altogether are electrically connected, second capacitor C, 2 other ends, the 8th resistance R 8 other ends, the 3rd triode Q3 emitting stage are electrically connected altogether, and the 3rd triode Q3 collector electrode is electrically connected with optocoupler U1 second pin.
Interlock circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, first capacitor C 1, the 3rd capacitor C 3, diode D1, the first triode Q1, the second triode Q2, power supply VCC, wherein optocoupler U1 the 4th pin is electrically connected with second resistance R, 2 one ends, second resistance R, 2 other ends, the second triode Q2 emitter, power supply VCC end points altogether is electrically connected, first resistance R, 1 one ends, first capacitor C, 1 one ends are electrically connected with power end VCC respectively, first resistance R, 1 other end, first capacitor C, 1 other end, the second triode Q2 base stage, the 5th resistance R 5 one ends are electrically connected, the second triode Q2 collector electrode, the 4th resistance R 4 one ends are electrically connected, the 4th resistance R 4 other ends are electrically connected with the first triode Q1 base stage, the 3rd capacitor C 3 one ends, the 3rd resistance R 3 one ends are electrically connected with the first triode Q1 base stage respectively, the 3rd capacitor C 3 other ends are connected with the first triode Q1 emitting stage respectively altogether with the 3rd resistance R 3 other ends, the 5th resistance R 5 other ends respectively with diode D1 negative electrode, the first triode Q1 collector electrode is electrically connected, diode D1 anode is electrically connected with feedback signal terminal FB, wherein the first triode Q1 is a NPN type triode, the second triode Q2 is the positive-negative-positive triode, the 3rd triode Q3 is a NPN type triode, feedback signal FB is expressed as the feedback signal of power supply control chip, power end VCC is expressed as the supply power voltage of power supply control chip, provide by transformer, to be the power supply outlet side be the supply power voltage that the photodiode of optocoupler provides to the optocoupler supply power voltage, can be the 5V voltage of power supply output or 24V voltage etc., triggering signal be that power supply unusual condition occurs (as overvoltage, overload etc.) make the voltage signal of the 3rd triode Q3 saturation conduction the time.Optocoupler U1 inner integrated a light-emitting diode and a phototriode transmit by light signal between its input and the output, thereby isolate fully on electric between two parts, do not have the feedback and the interference of the signal of telecommunication.Optocoupler U1 first pin is that positive pole, optocoupler second pin of light-emitting diode is the negative pole of light-emitting diode, and the optocoupler three-prong is the emitter of phototriode, the collector electrode of optocoupler the 4th pin phototriode.
The course of work: this circuit under normal circumstances, " triggering signal " is low level, the 3rd triode Q3 base stage does not have control voltage, not conducting, optocoupler U1 interior light emitting diodes is not worked, and is in cut-off state.No light signal transmission in the optocoupler U1, phototriode is not worked, and is in cut-off state, the first triode Q1 base stage does not have driving voltage and is in cut-off state, and at this moment, the base stage of the second triode Q2 and emitter are power supply VCC voltage, be in cut-off state, latching circuit is failure to actuate.
Other interlock circuit detects the output voltage and the electric current of power supply in the course of the work, when unusual conditions such as overvoltage, overload occurring when power supply, " triggering signal " is changed to high level, and " triggering signal " makes the 3rd triode Q3 emitter and collector electrode conducting by the 7th resistance R 7, the 8th resistance R 8 dividing potential drops for the 3rd triode Q3 base stage provides control voltage.Optocoupler U1 first pin meets optocoupler supply power voltage V by the 6th resistance R 6, optocoupler U1 second pin is owing to be low level after the 3rd triode Q3 emitter and the collector electrode conducting, light signal is sent in the light-emitting diode conducting in the optocoupler U1, this light source irradiation makes phototriode produce collector current and conducting to the phototriode surface.After phototriode conducting in the optocoupler U1, form latching circuit.The latching circuit detailed process is: power supply VCC voltage carries out dividing potential drop by resistance R 2, R3, for the first triode Q1 base stage provides control voltage, make the first triode Q1 emitter and collector electrode conducting, power supply VCC voltage forms the loop by the emitter of resistance R 1, R5, the first triode Q1, the collector electrode of the first triode Q1 to ground, for the second triode Q2 base stage provides control voltage.After pressure reduction between the base stage of the second triode Q2 and emitter is greater than 0.7V; the second triode Q2 conducting; power supply VCC voltage is through the second triode Q2 emitter; the second triode Q2 collector electrode; resistance R 4; R3 forms the loop to ground; for the first triode Q1 base stage provides Sustainable Control voltage; make the first triode Q1 continue conducting; continuing feedback signal FB with power supply control chip through low pressure reduction diode D1 simultaneously is pulled low to the power supply control chip action and stops that (conduction voltage drop of its mesolow difference diode D1 is 0.4V below the voltage; the saturation conduction pressure drop of the CE utmost point of triode Q1 is 0.3V; can guarantee that the feedback signal FB voltage of power supply control chip maintains 0.7V when therefore latching circuit moves; be lower than power supply control chip action stopping voltage); the power supply control chip no-output enters guard mode.
The circuit unlocking condition is: 1, light-emitting diode ends between optocoupler U1 first pin and optocoupler U1 second pin, no longer produces light signal; 2, power supply VCC voltage amplitude reduces, until the loop that forms to ground by first resistance R 1, the 5th resistance R 5 and the first triode Q1 emitter and the first triode Q1 collector electrode, make the second triode Q2 base stage and emitter interpolar pressure reduction less than 0.7V, the second triode Q2 ends; This moment, power supply VCC voltage can't provide base stage control voltage to formation loop, ground for the first triode Q1 through transmitter and collector electrode, the 4th resistance R 4, the 3rd resistance R 3 of the second triode Q2, and the first triode Q1 ends.
Disclosed all features in this specification except mutually exclusive feature, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Claims (6)
1. a Switching Power Supply self-lock protection circuit is characterized in that comprising circuits for triggering, photoelectric coupled circuit, interlock circuit, and described circuits for triggering, described photoelectric coupled circuit, described interlock circuit are electrically connected in proper order.
2. a kind of Switching Power Supply self-lock protection circuit according to claim 1 is characterized in that described circuits for triggering input as Switching Power Supply self-lock protection circuit input end, and described Switching Power Supply self-lock protection circuit input end is electrically connected with described triggering signal.
3. a kind of Switching Power Supply self-lock protection circuit according to claim 1; it is characterized in that described interlock circuit output as Switching Power Supply self-lock protection circuit output end, described Switching Power Supply self-lock protection circuit output end is electrically connected with described feedback signal terminal (FB).
4. a kind of Switching Power Supply self-lock protection circuit according to claim 1; it is characterized in that described photoelectric coupled circuit comprises optocoupler (U1), the 6th resistance (R6), optocoupler supply power voltage (V); wherein said optocoupler (U1) first pin is electrically connected with described the 6th resistance (R6) end; described the 6th resistance (R6) other end is electrically connected with described optocoupler supply power voltage end; described optocoupler (U1) second pin is electrically connected with described circuits for triggering, and described optocoupler (U1) three-prong, described optocoupler (U1) the 4th pin are electrically connected with described interlock circuit respectively.
5. a kind of Switching Power Supply self-lock protection circuit according to claim 1; it is characterized in that described circuits for triggering comprise the 3rd triode (Q3); second electric capacity (C2); the 7th resistance (R7); the 8th resistance (R8); wherein said the 7th resistance (R7) end in contact is signaled; described second electric capacity (C2) end; described the 8th resistance (R8) end; described the 7th resistance (R7) other end; described the 3rd triode (Q3) base stage end points altogether is electrically connected; described second electric capacity (C2) other end; described the 8th resistance (R8) other end; described the 3rd triode (Q3) emitting stage is electrically connected altogether, and described the 3rd triode (Q3) collector electrode is electrically connected with described optocoupler (U1) second pin.
6. a kind of Switching Power Supply self-lock protection circuit according to claim 1; it is characterized in that described interlock circuit comprises first resistance (R1); second resistance (R2); the 3rd resistance (R3); the 4th resistance (R4); the 5th resistance (R5); first electric capacity (C1); the 3rd electric capacity (C3); diode (D1); first triode (Q1); second triode (Q2); power supply (VCC); wherein said optocoupler (U1) the 4th pin is electrically connected with described second resistance (R2) end; described second resistance (R2) other end; described second triode (Q2) emitter; described power supply (VCC) end points altogether is electrically connected; described first resistance (R1) end; described first electric capacity (C1) end is electrically connected with described power end (VCC) respectively; described first resistance (R1) other end; described first electric capacity (C1) other end; described second triode (Q2) base stage; described the 5th resistance (R5) end is electrically connected; described second triode (Q2) collector electrode; described the 4th resistance (R4) end is electrically connected; described the 4th resistance (R4) other end is electrically connected with described first triode (Q1) base stage; described the 3rd electric capacity (C3) end; described the 3rd resistance (R3) end is electrically connected with described first triode (Q1) base stage respectively; described the 3rd electric capacity (C3) other end is connected with described first triode (Q1) emitting stage respectively altogether with described the 3rd resistance (R3) other end; described the 5th resistance (R5) other end respectively with described diode (D1) negative electrode; described first triode (Q1) collector electrode is electrically connected, and described diode (D1) anode is electrically connected with described feedback signal terminal (FB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206739705U CN201937248U (en) | 2010-12-22 | 2010-12-22 | Self-locking protective circuit for switch power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206739705U CN201937248U (en) | 2010-12-22 | 2010-12-22 | Self-locking protective circuit for switch power supply |
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| Publication Number | Publication Date |
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| CN201937248U true CN201937248U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206739705U Expired - Lifetime CN201937248U (en) | 2010-12-22 | 2010-12-22 | Self-locking protective circuit for switch power supply |
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| CN (1) | CN201937248U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736524A (en) * | 2011-04-07 | 2012-10-17 | 国基电子（上海）有限公司 | Power switch |
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN102820637A (en) * | 2012-08-21 | 2012-12-12 | 浪潮电子信息产业股份有限公司 | Circuit self-locking protective device with self-recovery function |
| CN103158668A (en) * | 2013-03-26 | 2013-06-19 | 北京经纬恒润科技有限公司 | Self-locking output circuit and car anti-theft circuit |
| CN103391074A (en) * | 2013-07-12 | 2013-11-13 | 成都启臣微电子有限公司 | Switch power supply self-locking protection circuit |
| CN103928909A (en) * | 2014-02-28 | 2014-07-16 | 深圳市伟创电气有限公司 | Quick and reliable short-circuit protection method and circuit of switch power supply |
| CN104218518A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Over current and over voltage protection electric circuit and lamp using same |
| CN117335789A (en) * | 2023-12-01 | 2024-01-02 | 深圳鹏城新能科技有限公司 | Isolation self-locking circuit and method |
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2010
- 2010-12-22 CN CN2010206739705U patent/CN201937248U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736524A (en) * | 2011-04-07 | 2012-10-17 | 国基电子（上海）有限公司 | Power switch |
| CN102736524B (en) * | 2011-04-07 | 2014-04-30 | 国基电子（上海）有限公司 | Power switch |
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN102761252B (en) * | 2012-07-25 | 2015-05-27 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN102820637B (en) * | 2012-08-21 | 2016-08-03 | 浪潮电子信息产业股份有限公司 | A kind of circuit self-locking protecting device with self-recovering function |
| CN102820637A (en) * | 2012-08-21 | 2012-12-12 | 浪潮电子信息产业股份有限公司 | Circuit self-locking protective device with self-recovery function |
| CN103158668A (en) * | 2013-03-26 | 2013-06-19 | 北京经纬恒润科技有限公司 | Self-locking output circuit and car anti-theft circuit |
| CN103158668B (en) * | 2013-03-26 | 2015-08-26 | 北京经纬恒润科技有限公司 | A kind of self-locking output circuit and automobile burglar circuit |
| CN104218518B (en) * | 2013-05-30 | 2017-02-22 | 深圳市海洋王照明工程有限公司 | Over current and over voltage protection electric circuit and lamp using same |
| CN104218518A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Over current and over voltage protection electric circuit and lamp using same |
| CN103391074A (en) * | 2013-07-12 | 2013-11-13 | 成都启臣微电子有限公司 | Switch power supply self-locking protection circuit |
| CN103391074B (en) * | 2013-07-12 | 2016-01-20 | 成都启臣微电子有限公司 | A kind of Switching Power Supply self-locking protective circuit |
| CN103928909B (en) * | 2014-02-28 | 2016-08-24 | 深圳市伟创电气有限公司 | The short-circuit protection method of Switching Power Supply fast and reliable and circuit |
| CN103928909A (en) * | 2014-02-28 | 2014-07-16 | 深圳市伟创电气有限公司 | Quick and reliable short-circuit protection method and circuit of switch power supply |
| CN117335789A (en) * | 2023-12-01 | 2024-01-02 | 深圳鹏城新能科技有限公司 | Isolation self-locking circuit and method |
| CN117335789B (en) * | 2023-12-01 | 2024-03-22 | 深圳鹏城新能科技有限公司 | Isolation self-locking circuit and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110817 |
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| CX01 | Expiry of patent term |