CN205304223U - Power output protection circuit - Google Patents
Power output protection circuit Download PDFInfo
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- CN205304223U CN205304223U CN201620013493.7U CN201620013493U CN205304223U CN 205304223 U CN205304223 U CN 205304223U CN 201620013493 U CN201620013493 U CN 201620013493U CN 205304223 U CN205304223 U CN 205304223U
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Abstract
The utility model discloses a power output protection circuit, including insulated -gate bipolar transistor T, driver chip EXB841, comparator A, resistance R1 to R6, diode D1 to D3, comparator A's syntropy input connecting resistance R3 one end, resistance R3 other end connecting resistance R1 one end, comparator A's reverse input end connecting resistance R4's one end, C is held to resistance R4's moving of other end connecting resistance R2, resistance R2's fixed end a while connecting resistance R1 one end and resistance R3 one end, connecting resistance R6 between comparator A's port 1 and signal output part, comparator A's signal output part connects diode D2's negative pole, diode D2's the anodal port 4 of connecting driver chip EXB841. This scheme through above -mentioned circuit can eliminate forward voltage drop along with the electric current the different and different circumstances, insulated -gate bipolar transistor can slowly be turn -offed under the circumstances that takes place to overflow at the circuit to and driver EXB841's setting, guarantees that the circuit job stabilization is reliable.
Description
Technical field
This utility model relates to mu balanced circuit field, is specifically related to power output protection circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, controls the time ratio that switching tube turns on and off, and maintains a kind of power supply of regulated output voltage, and Switching Power Supply is generally controlled IC and MOSFET by pulse width modulation (PWM) and constitutes. Development and innovation along with Power Electronic Technique so that switch power technology is also innovated constantly. At present, Switching Power Supply is widely used almost all of electronic equipment with small-sized, light weight and high efficiency feature, is that current electronics and information industry develops rapidly indispensable a kind of power mode. High speed development along with Power Electronic Technique, power electronic equipment is day by day close with the relation of the work of people, life, and electronic equipment all be unable to do without reliable power supply, the entrance computer power supply eighties achieves Switching Power Supply comprehensively, taken the lead in computer power supply regenerate, the entrance Switching Power Supply nineties subsequently enters various electronics, electric equipment field, programme-controlled exchange, communication, electron detection device power supply, control device power supply (DPS) etc. have been widely used Switching Power Supply all, have more promoted developing rapidly of switch power technology. In existing switching power circuit, forward voltage drop produces difference with electric current difference, if the situation that stream occurred in circuit is easily damaged Switching Power Supply, affects the stability of work.
Utility model content
This utility model overcomes the deficiencies in the prior art; power output protection circuit is provided; this circuit can eliminate the situation that forward voltage drop is different with electric current and different; and the setting of driver EXB841; insulated gate bipolar transistor can be slowly turned off, it is ensured that it is reliable and stable that circuit works when circuit occurs and flows.
For solving above-mentioned technical problem, this utility model is by the following technical solutions: power output protection circuit, including insulated gate bipolar transistor T, driving chip EXB841, comparator A, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2 and diode D3, the input in the same direction of described comparator A connects resistance R3 one end, the resistance R3 other end connects resistance R1 one end, the resistance R1 other end connects power supply VCC, the reverse input end of comparator A connects one end of resistance R4, the other end of resistance R4 connects the moved end c of resistance R2, the fixed end b ground connection of resistance R2, the fixed end a of resistance R2 is simultaneously connected with resistance R1 one end and resistance R3 one end, resistance R6 is connected between port 1 and the signal output part of comparator A, the signal output part of comparator A connects the negative pole of diode D2, the positive pole of diode D2 connects the port 4 of driving chip EXB841, the input in the same direction of comparator A is also connected with the positive pole of diode D1, the negative pole of diode D1 connects the port b of insulated gate bipolar transistor T, the port 1 of comparator A is also connected with power supply VCC,The port 1 of described driving chip EXB841 connects resistance R5 one end, the resistance R5 other end connects the port a of insulated gate bipolar transistor T, the port 2 of driving chip EXB841 connects the negative pole of diode D3, the positive pole of diode D3 connects the port 5 of driving chip EXB841, and the port 3 of driving chip EXB841 connects power supply VCC; The port c of described insulated gate bipolar transistor T connects the port 2 of driving chip EXB841.
When power supply output overloading or short circuit, the Vbc magnitude of voltage of IGBT insulated gate bipolar transistor T then becomes big, and circuit is then taked protective measure according to this principle by this circuit. This circuit uses special driver EXB841, and its internal circuit can complete to drop grid and soft switching well, and has internal latency function, it is possible to eliminate the misoperation that interference produces. The operation principle of this circuit is as follows, cross the Vbc of stream information containing IGBT insulated gate bipolar transistor T not to be sent directly to the collector voltage of driving chip EXB841 and monitor foot 4, but through fast recovery diode D1, the port 4 of driving chip EXB841 is received by comparator A output, thus eliminating the situation that forward voltage drop is different with electric current and different, and comparator A is threshold comparator, improve the accuracy of current detecting. The reverse input end of comparator A is sequentially connected with resistance R4 and the moved end of resistance R2, the moved end of swept resistance R2 and the reference voltage of scalable reverse input end, thus controlling the output signal of comparator A. The setting of resistance R1 and resistance R2 is then the magnitude of voltage in order to limit comparator input in the same direction, diode D1, diode D2 and diode D3 are then for the flow direction of electric current in limiting circuit so that circuit can better eliminate the situation that forward voltage drop is different with electric current and different. If there occurs stream, the low speed of driver EXB841 cuts off circuit can slowly turn off IGBT insulated gate bipolar transistor T, thus avoiding collector current spike to damage IGBT insulated gate bipolar transistor T.
The port 3 of described driving chip EXB841 is also connected with drop-down electric capacity C1. For filtering out the garbage signal of the port 3 of driver EXB841.
Two ends parallel connection polar capacitor C2, polar capacitor C2 one end ground connection of described diode D3. This electric capacity C2 is for filtering out the clutter at the port c place of insulated gate bipolar transistor T.
Port 2 ground connection of described comparator A.
Compared with prior art, the beneficial effects of the utility model are:
1, this circuit uses special driver EXB841, and its internal circuit can complete to drop grid and soft switching well, and has internal latency function, it is possible to eliminate the misoperation that interference produces.
2, this circuit crosses the Vbc of stream information containing IGBT insulated gate bipolar transistor T not to be sent directly to the collector voltage of driving chip EXB841 and monitor foot 4, but through fast recovery diode D1, the port 4 of driving chip EXB841 is received, thus eliminating the situation that forward voltage drop is different with electric current and different by comparator A output.
If 3 there occurs stream, the low speed of driver EXB841 cuts off circuit can slowly turn off IGBT insulated gate bipolar transistor T, thus avoiding collector current spike to damage IGBT insulated gate bipolar transistor T, it is ensured that the stability of circuit work.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model being further elaborated, embodiment of the present utility model is not limited to this.
Embodiment 1:
As shown in Figure 1, this utility model includes insulated gate bipolar transistor T, driving chip EXB841, comparator A, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2 and diode D3, the input in the same direction of described comparator A connects resistance R3 one end, the resistance R3 other end connects resistance R1 one end, the resistance R1 other end connects power supply VCC, the reverse input end of comparator A connects one end of resistance R4, the other end of resistance R4 connects the moved end c of resistance R2, the fixed end b ground connection of resistance R2, the fixed end a of resistance R2 is simultaneously connected with resistance R1 one end and resistance R3 one end, resistance R6 is connected between port 1 and the signal output part of comparator A, the signal output part of comparator A connects the negative pole of diode D2, the positive pole of diode D2 connects the port 4 of driving chip EXB841, the input in the same direction of comparator A is also connected with the positive pole of diode D1, the negative pole of diode D1 connects the port b of insulated gate bipolar transistor T, the port 1 of comparator A is also connected with power supply VCC,The port 1 of described driving chip EXB841 connects resistance R5 one end, the resistance R5 other end connects the port a of insulated gate bipolar transistor T, the port 2 of driving chip EXB841 connects the negative pole of diode D3, the positive pole of diode D3 connects the port 5 of driving chip EXB841, and the port 3 of driving chip EXB841 connects power supply VCC; The port c of described insulated gate bipolar transistor T connects the port 2 of driving chip EXB841.
When power supply output overloading or short circuit, the Vbc magnitude of voltage of IGBT insulated gate bipolar transistor T then becomes big, and circuit is then taked protective measure according to this principle by this circuit. This circuit uses special driver EXB841, and its internal circuit can complete to drop grid and soft switching well, and has internal latency function, it is possible to eliminate the misoperation that interference produces. The operation principle of this circuit is as follows, cross the Vbc of stream information containing IGBT insulated gate bipolar transistor T not to be sent directly to the collector voltage of driving chip EXB841 and monitor foot 4, but through fast recovery diode D1, the port 4 of driving chip EXB841 is received by comparator A output, thus eliminating the situation that forward voltage drop is different with electric current and different, and comparator A is threshold comparator, improve the accuracy of current detecting. The reverse input end of comparator A is sequentially connected with resistance R4 and the moved end of resistance R2, the moved end of swept resistance R2 and the reference voltage of scalable reverse input end, thus controlling the output signal of comparator A. The setting of resistance R1 and resistance R2 is then the magnitude of voltage in order to limit comparator input in the same direction, diode D1, diode D2 and diode D3 are then for the flow direction of electric current in limiting circuit so that circuit can better eliminate the situation that forward voltage drop is different with electric current and different. If there occurs stream, the low speed of driver EXB841 cuts off circuit can slowly turn off IGBT insulated gate bipolar transistor T, thus avoiding collector current spike to damage IGBT insulated gate bipolar transistor T.
The port 3 of described driving chip EXB841 is also connected with drop-down electric capacity C1. For filtering out the garbage signal of the port 3 of driver EXB841.
Two ends parallel connection polar capacitor C2, polar capacitor C2 one end ground connection of described diode D3. This electric capacity C2 is for filtering out the clutter at the port c place of insulated gate bipolar transistor T.
Port 2 ground connection of described comparator A.
Just this utility model can be realized as mentioned above.
Claims (4)
1. power output protection circuit, it is characterized in that: include insulated gate bipolar transistor T, driving chip EXB841, comparator A, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1, diode D2 and diode D3, the input in the same direction of described comparator A connects resistance R3 one end, the resistance R3 other end connects resistance R1 one end, the resistance R1 other end connects power supply VCC, the reverse input end of comparator A connects one end of resistance R4, the other end of resistance R4 connects the moved end c of resistance R2, the fixed end b ground connection of resistance R2, the fixed end a of resistance R2 is simultaneously connected with resistance R1 one end and resistance R3 one end, resistance R6 is connected between port 1 and the signal output part of comparator A, the signal output part of comparator A connects the negative pole of diode D2, the positive pole of diode D2 connects the port 4 of driving chip EXB841, the input in the same direction of comparator A is also connected with the positive pole of diode D1, the negative pole of diode D1 connects the port b of insulated gate bipolar transistor T, the port 1 of comparator A is also connected with power supply VCC,The port 1 of described driving chip EXB841 connects resistance R5 one end, the resistance R5 other end connects the port a of insulated gate bipolar transistor T, the port 2 of driving chip EXB841 connects the negative pole of diode D3, the positive pole of diode D3 connects the port 5 of driving chip EXB841, and the port 3 of driving chip EXB841 connects power supply VCC; The port c of described insulated gate bipolar transistor T connects the port 2 of driving chip EXB841.
2. power output protection circuit according to claim 1, it is characterised in that: the port 3 of described driving chip EXB841 is also connected with drop-down electric capacity C1.
3. power output protection circuit according to claim 1, it is characterised in that: two ends parallel connection polar capacitor C2, polar capacitor C2 one end ground connection of described diode D3.
4. power output protection circuit according to claim 1, it is characterised in that: port 2 ground connection of described comparator A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620013493.7U CN205304223U (en) | 2016-01-08 | 2016-01-08 | Power output protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620013493.7U CN205304223U (en) | 2016-01-08 | 2016-01-08 | Power output protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205304223U true CN205304223U (en) | 2016-06-08 |
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ID=56485873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620013493.7U Expired - Fee Related CN205304223U (en) | 2016-01-08 | 2016-01-08 | Power output protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205304223U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490251A (en) * | 2016-01-08 | 2016-04-13 | 成都市宏山科技有限公司 | Protection circuit capable of working stably |
| CN109245052A (en) * | 2018-08-29 | 2019-01-18 | 广州金升阳科技有限公司 | A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit |
-
2016
- 2016-01-08 CN CN201620013493.7U patent/CN205304223U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490251A (en) * | 2016-01-08 | 2016-04-13 | 成都市宏山科技有限公司 | Protection circuit capable of working stably |
| CN109245052A (en) * | 2018-08-29 | 2019-01-18 | 广州金升阳科技有限公司 | A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit |
| CN109245052B (en) * | 2018-08-29 | 2024-04-12 | 广州金升阳科技有限公司 | Short-circuit protection circuit and switching power supply comprising same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20170108 |