CN205490120U - Put short -circuit protection circuit based on two fortune - Google Patents
Put short -circuit protection circuit based on two fortune Download PDFInfo
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- CN205490120U CN205490120U CN201620103690.8U CN201620103690U CN205490120U CN 205490120 U CN205490120 U CN 205490120U CN 201620103690 U CN201620103690 U CN 201620103690U CN 205490120 U CN205490120 U CN 205490120U
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- 208000031361 Hiccup Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model relates to a put short -circuit protection circuit based on two fortune, including an operational circuit, the 2nd operational circuit and control circuit, an operational circuit includes an operational amplifier X1, diode D1, and resistance R1, R5, R6, R7, electric capacity C1, diode D1's the external sampled signal of positive pole, its negative pole is continuous through a resistance R7 and an operational amplifier X1's non inverting input end, an operational amplifier X1's reverse input end links to each other with the power through resistance R5, an operational amplifier X1's power negative pole end links to each other, links to each other rather than the reverse input end through resistance R6 rather than the non inverting input end through resistance R1 respectively, electric capacity C1 connects in parallel at resistance R1's both ends, an operational amplifier X1's output and the 2nd operational circuit link to each other. The utility model discloses a control system's the time of hiccuing, reduced switching power supply's short circuit consumption, improved the ability that switching power supply took capacitive load.
Description
Technical field
This utility model relates to short circuit protecting circuit for switch power, is specifically related to a kind of based on double operational short-circuit protection circuit.
Background technology
At present, short circuit protecting circuit for switch power mainly uses single amplifier short-circuit protection circuit, and advantage is that circuit is simple, saves volume, and debugging is convenient.But when system short-circuit, system power dissipation is relatively big, easily forms heat accumulation, and the reliability on internal component that works long hours has certain impact.It addition, the size of system short-circuit power consumption becomes the trend of inverse change with the ability of band capacitive load.Therefore the research carrying out double operational short-circuit protection circuit both can solve the problem that short-circuit dissipation is bigger, can solve again the problem that system band capacitance load capability is poor.
Utility model content
The purpose of this utility model is to provide a kind of based on double operational short-circuit protection circuit, and this circuit is reliable, and during short circuit, system power dissipation is relatively low, and debugging is convenient, and band capacitance load capability is strong.
nullFor achieving the above object，This utility model have employed techniques below scheme: includes the first discharge circuit、Second discharge circuit and control circuit，The outfan of described first discharge circuit and the input of the second discharge circuit are connected，The outfan of the second discharge circuit is connected with the input of control circuit，Described first discharge circuit includes the first operational amplifier X1，Diode D1,Resistance R1、R5、R6、R7，Electric capacity C1，The external sampled signal of anode of described diode D1，Its negative electrode is connected through the in-phase input end of resistance R7 and the first operational amplifier X1，The reverse input end of described first operational amplifier X1 is connected with power supply through resistance R5，The power cathode end of described first operational amplifier X1 is connected with its in-phase input end through resistance R1 respectively、It is connected with its reverse input end through resistance R6，Described electric capacity C1 is connected in parallel on the two ends of resistance R1，The outfan of described first operational amplifier X1 and the second discharge circuit are connected.
Described second discharge circuit includes the second operational amplifier X2, diode D2, resistance R2, R3, R4 and electric capacity C2, the in-phase input end of described second operational amplifier X2 is connected with its power positive end through resistance R2, the outfan of described diode D2 anode and the first operational amplifier X1 is connected, the in-phase input end of its negative electrode and the second operational amplifier X2 is connected, described electric capacity C2 is connected in parallel on the two ends of resistance R2, the reverse input end of the second amplifier X2 is connected with its power cathode end by resistance R4, and it is connected through the reverse input end of resistance R3 and the first operational amplifier X1.
Described control circuit includes audion Q1, diode D3, resistance R8 and electric capacity C4, the base stage of described diode Q1 is connected through the negative electrode of resistance R8 with diode D3, the anode of described diode D3 and the second discharge circuit are connected, the control end of the external PWM of colelctor electrode of diode Q1, the emitter stage of described diode Q1 is connected with its base stage through electric capacity C4.
As shown from the above technical solution; double operational short-circuit protection circuit described in the utility model; by threshold voltage and the value of R2, C2 of regulation second level discharge circuit; when can well control short circuit, system has the hiccups the time; having the hiccups the time by control system; reduce the short-circuit dissipation of Switching Power Supply, improve the ability of Switching Power Supply band capacitive load.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model；
Fig. 2 is circuit diagram of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described further:
nullSuch as Fig. 1、Shown in 2，The present embodiment based on double operational short-circuit protection circuit，Including the first discharge circuit 1、Second discharge circuit 2 and control circuit 3，The outfan of the first discharge circuit 1 and the input of the second discharge circuit 2 are connected，The outfan of the second discharge circuit 2 is connected with the input of control circuit 3，First discharge circuit 1 includes the first operational amplifier X1，Diode D1，Resistance R1、R5、R6、R7，Electric capacity C1，The external sampled signal of anode of diode D1，Its negative electrode is connected through the in-phase input end of resistance R7 and the first operational amplifier X1，The reverse input end of the first operational amplifier X1 is connected with power supply through resistance R5，The power cathode end of the first operational amplifier X1 is connected with its in-phase input end through resistance R1 respectively、It is connected with its reverse input end through resistance R6，Electric capacity C1 is connected in parallel on the two ends of resistance R1，Outfan and second discharge circuit 2 of the first operational amplifier X1 are connected.The negative input end that resistance R5 in this circuit and resistance R6 is first order amplifier X1 through dividing potential drop provides a DC voltage, and sampled point positive input terminal for first order amplifier X1 after diode D1, resistance R7, resistance R1, electric capacity C1 provides a DC voltage.
As shown in Figure 2, this second discharge circuit 2 includes the second operational amplifier X2, diode D2, resistance R2, R3, R4 and electric capacity C2, the in-phase input end of the second operational amplifier X2 is connected with its power positive end through resistance R2, the outfan of diode D2 anode and the first operational amplifier X1 is connected, the in-phase input end of its negative electrode and the second operational amplifier X2 is connected, electric capacity C2 is connected in parallel on the two ends of resistance R2, the reverse input end of the second amplifier X2 is connected with its power cathode end by resistance R4, and connected through the reverse input end of resistance R3 and the first operational amplifier X1.The negative input end that resistance R3 and R4 in this circuit is second level amplifier X2 through dividing potential drop provides a DC voltage, and the positive input terminal that the output of first order amplifier X1 is amplifier X2 through diode D2, resistance R2, electric capacity C2 provides a DC voltage.
As shown in Figure 2, this control circuit 3 includes audion Q1, diode D3, resistance R8 and electric capacity C4, the base stage of diode Q1 is connected through the negative electrode of resistance R8 with diode D3, the outfan of the second operational amplifier X2 in the anode of diode D3 and the second discharge circuit 2 is connected, and the control end of the external PWM of colelctor electrode of diode Q1, the emitter stage of diode Q1 is connected with its base stage through electric capacity C4.
This utility model uses and two amplifiers is used in series, and being divided into two-stage, first order discharge circuit 1 is that threshold protects dot circuit, and second level discharge circuit 2 is circuit of having the hiccups, and is realized the purpose of short-circuit protection by control circuit 3.During output short-circuit, current sampling signal can arrive the positive input terminal of amplifier the first operational amplifier X1 by diode D1, X1 is made to be output as high level, this high level charges to 5V-0.7V=4.3V for electric capacity C2 rapidly, the positive input terminal level of amplifier X2 is higher than negative input end level, so being output as high level, opens audion Q1, move the control terminal voltage of PWM to low level, thus reach the purpose of limiting short-circuit current.Before voltage on electric capacity C2 drops to the negative input end level of second level amplifier X2, amplifier X2 exports high level always, and system is constantly in idle condition, and this state is also referred to as " having the hiccups ".By regulation R2 and C2, when can well control short circuit, system has the hiccups the time.Having the hiccups the time by control system, can reduce the power consumption during short-circuit protection of system further.
Embodiment described above is only to be described preferred implementation of the present utility model; not scope of the present utility model is defined; on the premise of without departing from this utility model design spirit; various deformation that the technical solution of the utility model is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that this utility model claims determine.
Claims (3)
- null1. one kind based on double operational short-circuit protection circuit，It is characterized in that: include the first discharge circuit、Second discharge circuit and control circuit，The outfan of described first discharge circuit and the input of the second discharge circuit are connected，The outfan of the second discharge circuit is connected with the input of control circuit，Described first discharge circuit includes the first operational amplifier X1，Diode D1,Resistance R1、R5、R6、R7，Electric capacity C1，The external sampled signal of anode of described diode D1，Its negative electrode is connected through the in-phase input end of resistance R7 and the first operational amplifier X1，The reverse input end of described first operational amplifier X1 is connected with power supply through resistance R5，The power cathode end of described first operational amplifier X1 is connected with its in-phase input end through resistance R1 respectively、It is connected with its reverse input end through resistance R6，Described electric capacity C1 is connected in parallel on the two ends of resistance R1，The outfan of described first operational amplifier X1 and the second discharge circuit are connected.
- The most according to claim 1 based on double operational short-circuit protection circuit, it is characterized in that: described second discharge circuit includes the second operational amplifier X2, diode D2, resistance R2, R3, R4 and electric capacity C2, the in-phase input end of described second operational amplifier X2 is connected with its power positive end through resistance R2, the outfan of described diode D2 anode and the first operational amplifier X1 is connected, the in-phase input end of its negative electrode and the second operational amplifier X2 is connected, described electric capacity C2 is connected in parallel on the two ends of resistance R2, the reverse input end of the second amplifier X2 is connected with its power cathode end by resistance R4, and it is connected through the reverse input end of resistance R3 and the first operational amplifier X1.
- The most according to claim 1 and 2 based on double operational short-circuit protection circuit; it is characterized in that: described control circuit includes audion Q1; diode D3; resistance R8 and electric capacity C4; the base stage of described diode Q1 is connected through the negative electrode of resistance R8 with diode D3; the anode of described diode D3 and the second discharge circuit are connected, and the control end of the external PWM of colelctor electrode of diode Q1, the emitter stage of described diode Q1 is connected with its base stage through electric capacity C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620103690.8U CN205490120U (en) | 2016-02-02 | 2016-02-02 | Put short -circuit protection circuit based on two fortune |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620103690.8U CN205490120U (en) | 2016-02-02 | 2016-02-02 | Put short -circuit protection circuit based on two fortune |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205490120U true CN205490120U (en) | 2016-08-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620103690.8U Expired - Fee Related CN205490120U (en) | 2016-02-02 | 2016-02-02 | Put short -circuit protection circuit based on two fortune |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205490120U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515360A (en) * | 2016-02-02 | 2016-04-20 | 中国电子科技集团公司第四十三研究所 | Short-circuit protection circuit based on double operational amplifiers |
-
2016
- 2016-02-02 CN CN201620103690.8U patent/CN205490120U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515360A (en) * | 2016-02-02 | 2016-04-20 | 中国电子科技集团公司第四十三研究所 | Short-circuit protection circuit based on double operational amplifiers |
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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: 20160817 |