CN202159967U - Switch power supply short-circuit protection circuit - Google Patents
Switch power supply short-circuit protection circuit Download PDFInfo
- Publication number
- CN202159967U CN202159967U CN2011202898251U CN201120289825U CN202159967U CN 202159967 U CN202159967 U CN 202159967U CN 2011202898251 U CN2011202898251 U CN 2011202898251U CN 201120289825 U CN201120289825 U CN 201120289825U CN 202159967 U CN202159967 U CN 202159967U
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- circuit
- power supply
- resistance
- switch power
- mose
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Abstract
The utility model discloses a switch power supply short-circuit protection circuit and belongs to a power supply protection circuit. The circuit comprises a triode QA, an MOSE tube Q11 and a plurality of resistors, wherein the triode QA of the protection circuit is connected in parallel with resistors RB and RC and used for the anode and cathode loop of an electric appliance; a resistor RD is connected in parallel with a resistor RE and used for the anode and cathode loop of the electric appliance; and the two ends of the MOSE tube Q11 are connected in parallel the a resistor RA. The protection circuit utilizes the characteristic that when the base voltage of the triode tube QA is less than the emitter voltage, the circuit can be conducted; and when the anode of the switch power supply is contacted with the cathode, the switch power supply circuit is in a short circuit situation, under the action of the protection circuit, the switch power supply circuit is not conducted so as to realize the protection of the switch power supply circuit, respond a short circuit situation of the switch power supply circuit, and avoid an accident caused by a short circuit or the damage of the switch power supply.
Description
Technical field
The utility model relates to a kind of power protecting circuit, a kind of Switching Power Supply short-circuit protection circuit of saying so more specifically.
Background technology
The effect of switching power circuit is to be applied in its conducting of control and disconnection in the power circuit; In switching power circuit during like the power output end short circuit; Then have very big electric current in the circuit and flow through, can cause serious consequence like this, damage Switching Power Supply like meeting; Even serious consequence such as initiation fire; And be the situation of avoiding switching power circuit to be short-circuited, common way is the elementary circuit protection of doing at switching power circuit, but the reaction after this mode takes place its short circuit condition is slower; Even the secondary situation of short circuit of responding to switch power circuit appears having little time sometimes, therefore the mode of traditional elementary protection of switching power circuit can't realize it is carried out real-time short-circuit protection.
The utility model content
The purpose of the utility model is to solve above-mentioned deficiency, and a kind of a kind of Switching Power Supply short-circuit protection circuit that can carry out real-time guard to switching power circuit is provided.
For solving above-mentioned technical problem, the utility model adopts following technical scheme:
A kind of Switching Power Supply short-circuit protection circuit that the utility model provided; Comprise triode QA, MOSE pipe Q11 and some resistance in the described circuit; Triode QA and resistance R B and RC are parallel on the both positive and negative polarity loop of electrical appliance in the described protective circuit, and resistance R D and RE also be parallel on the loop of electrical appliance both positive and negative polarity, and MOSE pipe Q11 is connected on the electrical appliance negative loop; And insert between resistance R B and the RC, and the two ends of MOSE pipe Q11 also are parallel with resistance R A.
Technical scheme further is: described MOSE pipe Q11 places on the electrical appliance negative loop between triode QA, resistance R B, resistance R C and resistance R D, the resistance R E parallel line.
Technical scheme further is: described resistance R A, RB, RC, RD and RE are big value resistance, and its resistance is all more than 1000 ohm.
Compared with prior art; The beneficial effect of the utility model is: utilize triode QA base voltage to be lower than the characteristic that emitter voltage could conducting, contact with negative pole when making switching power circuit short circuit condition occur like the positive pole of electrical appliance, under the effect of protective circuit switching power circuit will be not can conducting; Realization is to the real-time guard of switching power circuit; Insert on switching power circuit secondary because protective circuit is whole, the short circuit condition that therefore can occur switching power circuit very soon made response, and therefore accident or the Switching Power Supply avoiding occurring because of short circuit are damaged; And a kind of Switching Power Supply short-circuit protection circuit circuit structure that the utility model provided is simple; The circuit element amount is few, can be applicable on the various electrical appliances its switching power circuit carried out real-time guard, and range of application is wide.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further to set forth.
As shown in Figure 1; A kind of Switching Power Supply short-circuit protection circuit that the utility model provided; Comprise triode QA, MOSE pipe Q11 and some resistance in the described circuit, triode QA and resistance R B and RC are parallel on the both positive and negative polarity loop of electrical appliance in the described protective circuit, and resistance R D and RE also are parallel on the loop of electrical appliance both positive and negative polarity; MOSE pipe Q11 is connected on the electrical appliance negative loop; And insert between resistance R B and the RC, and the two ends of MOSE pipe Q11 also are parallel with resistance R A, and the technical scheme that is more preferably is MOSE to be managed Q11 place on the electrical appliance negative loop between triode QA, resistance R B, resistance R C and resistance R D, the resistance R E parallel line.And be to guarantee that the electric resistance partial pressure triggering situation in the protective circuit normally realizes; Aforesaid resistance R A, RB, RC, RD and RE all adopt big value resistance, its resistance greater than 1000 ohm for well, in this execution mode the resistance of resistance concrete adopt is: RA is 10K ohm; RB is 82K ohm; RC is 24K ohm, and RD is 62K ohm, and RE is 750K ohm.
A kind of Switching Power Supply short-circuit protection circuit course of work that the utility model provided is following: when the Switching Power Supply operate as normal; Because the triode QA base voltage in the protective circuit is lower than emitter voltage; So conducting, output voltage leads to resistance R B and RC by triode QA, and this moment, MOSE Q11 tube grid was got trigger voltage from RB and RC; Thereby MOSE Q11 manages conducting, and output current can be flow through from MOSE Q11 pipe.When the short circuit of Switching Power Supply output, i.e. voltage difference moment between electrical appliance LED+ among Fig. 1 and the LED-short circuit, this moment electrical appliance both positive and negative polarity becomes 0V; Triode QA is owing to its base voltage equates to automatically shut down with emitter voltage; Triode QA closes the no-voltage between resistance R B and the RC of having no progeny, and then causes MOSE Q11 tube grid triggerless voltage, makes it also be in off state; Therefore output current just can not flow through from MOSE Q11 pipe, thereby realizes protection.Output electrical appliance LED+ and LED-up to power circuit discharge, when promptly opening a way, by resistance R E; RD and RA divide voltage; Make the conducting again less than emitter voltage of triode QA base voltage, and then make the also conducting again of MOSE Q11 pipe, Switching Power Supply is recovered operate as normal.
Claims (3)
1. Switching Power Supply short-circuit protection circuit; Comprise triode QA, MOSE pipe Q11 and some resistance in the described circuit; It is characterized in that: triode QA and resistance R B and RC are parallel on the both positive and negative polarity loop of electrical appliance in the described protective circuit, and resistance R D and RE also be parallel on the loop of electrical appliance both positive and negative polarity, and MOSE pipe Q11 is connected on the electrical appliance negative loop; It inserts between resistance R B and the RC, and the two ends of MOSE pipe Q11 also are parallel with resistance R A.
2. Switching Power Supply short-circuit protection circuit according to claim 1 is characterized in that: described MOSE pipe Q11 places on the electrical appliance negative loop between triode QA, resistance R B, resistance R C and resistance R D, the resistance R E parallel line.
3. Switching Power Supply short-circuit protection circuit according to claim 1 is characterized in that: described resistance R A, RB, RC, RD and RE are big value resistance, and its resistance is all more than 1000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202898251U CN202159967U (en) | 2011-08-11 | 2011-08-11 | Switch power supply short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202898251U CN202159967U (en) | 2011-08-11 | 2011-08-11 | Switch power supply short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202159967U true CN202159967U (en) | 2012-03-07 |
Family
ID=45767590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202898251U Expired - Fee Related CN202159967U (en) | 2011-08-11 | 2011-08-11 | Switch power supply short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202159967U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457232A (en) * | 2012-05-29 | 2013-12-18 | 海洋王照明科技股份有限公司 | Short-circuit protection circuit of direct-current load and illuminator |
| CN104410036A (en) * | 2014-11-14 | 2015-03-11 | 深圳市九洲电器有限公司 | HDMI (high-definition multimedia interface) power supply protective circuit and audio and video equipment |
| CN104466914A (en) * | 2013-12-11 | 2015-03-25 | 成都芯源系统有限公司 | Short-circuit protection circuit and switching power supply and protection method thereof |
| CN105337267A (en) * | 2014-06-30 | 2016-02-17 | 展讯通信（上海）有限公司 | Short circuit protection system |
| CN105406288A (en) * | 2015-11-09 | 2016-03-16 | 合肥宝龙达光电技术有限公司 | Connector contact short circuit prevention circuit structure |
-
2011
- 2011-08-11 CN CN2011202898251U patent/CN202159967U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457232A (en) * | 2012-05-29 | 2013-12-18 | 海洋王照明科技股份有限公司 | Short-circuit protection circuit of direct-current load and illuminator |
| CN104466914A (en) * | 2013-12-11 | 2015-03-25 | 成都芯源系统有限公司 | Short-circuit protection circuit and switching power supply and protection method thereof |
| CN105337267A (en) * | 2014-06-30 | 2016-02-17 | 展讯通信（上海）有限公司 | Short circuit protection system |
| CN104410036A (en) * | 2014-11-14 | 2015-03-11 | 深圳市九洲电器有限公司 | HDMI (high-definition multimedia interface) power supply protective circuit and audio and video equipment |
| CN105406288A (en) * | 2015-11-09 | 2016-03-16 | 合肥宝龙达光电技术有限公司 | Connector contact short circuit prevention circuit structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20120811 |