CN201750125U - Short circuit self-locking protection circuit - Google Patents
Short circuit self-locking protection circuit Download PDFInfo
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- CN201750125U CN201750125U CN2010202374529U CN201020237452U CN201750125U CN 201750125 U CN201750125 U CN 201750125U CN 2010202374529 U CN2010202374529 U CN 2010202374529U CN 201020237452 U CN201020237452 U CN 201020237452U CN 201750125 U CN201750125 U CN 201750125U
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Abstract
The utility model relates to a short circuit self-locking protection circuit, which comprises a practical switching circuit, a high-level drive circuit and a short circuit protection circuit, the high-level drive circuit comprises a second triode, a second resistor and a third resistor; the short circuit protection circuit comprises a third triode, a fourth resistor, a fifth resistor, a sixth resistor, a capacitor and a voltage-regulator tube; the second triode includes a base, an emitter and a collector, wherein the base is connected with the practical switching circuit via the second resistor, and the practical switching circuit is simultaneously connected with the base via the third resistor; the collector is connected with an anode of the voltage-regulator tube via the sixth resistor; the third triode includes a base, an emitter and a collector, wherein the base is connected with a cathode of the voltage-regulator tube via the fifth resistor, and simultaneously connected with the fourth resistor and the capacitor, and the collector is connected with the base of the second triode, compared with the prior art, the utility model has the advantages of simple circuit structure, low cost and the like.
Description
Technical field
The utility model relates to a kind of self-lock protection circuit, especially relates to a kind of short circuit self-lock protection circuit.
Background technology
Protective circuit in the automobile electronics adopts intelligent metal-oxide-semiconductor to realize that its chip internal is integrated: various protections such as short circuit, overvoltage, overload mostly at present.But most of metal-oxide-semiconductor turn on and turn off time are all relatively long when the input control end is pulse-width modulation (PWM), and the frequency of application often is restricted, and can not satisfy normal demand under high-frequency.
In addition, monopolistic market has also caused the chip price costliness, and cost of goods manufactured is provided, and has influenced product competitiveness.
Summary of the invention
The purpose of this utility model is exactly to provide the short circuit self-lock protection that a kind of circuit structure is simple, cost is low circuit for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of short circuit self-lock protection circuit, it is characterized in that, comprise practical switching circuit, high level drive circuit, short-circuit protection circuit, first power supply, second source, the 3rd power supply, described high level drive circuit comprises second triode, second resistance, the 3rd resistance, and described short-circuit protection circuit comprises the 3rd triode, the 4th resistance, the 5th resistance, the 6th resistance, electric capacity, voltage-stabiliser tube;
Described second triode comprises base stage, emitter, collector electrode, and its base stage is connected with practical switching circuit by second resistance, and its base stage is by being connected with first power supply by the 3rd resistance; Its emitter is connected with first power supply; Its collector electrode is connected with the positive pole of voltage-stabiliser tube by the 6th resistance, and its collector electrode is connected with driven portion Drive;
Described the 3rd triode comprises base stage, emitter, collector electrode, and its base stage is connected with second source by electric capacity, the 4th resistance respectively, and its base stage is connected with the negative pole of voltage-stabiliser tube by the 5th resistance; Its emitter is connected with the 3rd power supply; Its collector electrode is connected with the base stage of second triode.
Described practical switching circuit comprises first resistance, first triode, and this first triode comprises base stage, emitter, collector electrode, and its base stage is passed through first resistance and is connected, its grounded emitter, and its collector electrode is connected with second resistance.
Described first power supply, second source, the 3rd power supply are the identical DC power supply of voltage.
Described first power supply, second source and the 3rd power source voltage are 5～24V.
Compared with prior art, the utlity model has following advantage:
1, circuit structure is simple, and cost is low;
2, can cut off the control end signal automatically after the short circuit, stop output, start shooting again up to disconnected power down source;
3, the resistance controlling and driving ability of adjustable resistance;
4, the input control signal frequency range is big.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of short circuit self-lock protection circuit, it is characterized in that, comprise practical switching circuit 1, high level drive circuit 2, short-circuit protection circuit 3, first power supply, second source, the 3rd power supply, described high level drive circuit 2 comprises the second triode Q2, second resistance R 2, the 3rd resistance R 3, and described short-circuit protection circuit 3 comprises the 3rd triode Q3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, capacitor C 1, voltage-stabiliser tube D1;
The described second triode Q2 comprises base stage, emitter, collector electrode, and its base stage is connected with practical switching circuit by second resistance R 2, and its base stage is connected with first power supply by the 3rd resistance R 3; Its emitter is connected with first power supply; Its collector electrode is connected with the positive pole of voltage-stabiliser tube D1 by the 6th resistance R 6, and its collector electrode is connected with driven portion Drive;
Described the 3rd triode Q3 comprises base stage, emitter, collector electrode, and its base stage is connected with second source by capacitor C 1, the 4th resistance R 4 respectively, and its base stage is connected with the negative pole of voltage-stabiliser tube D1 by the 5th resistance R 5; Its emitter is connected with the 3rd power supply; Its collector electrode is connected with the base stage of the second triode Q2.
Described practical switching circuit 1 comprises first resistance R 1, the first triode Q1, and this first triode Q1 comprises base stage, emitter, collector electrode, and its base stage is connected with MCU by first resistance R 1, its grounded emitter, and its collector electrode is connected with second resistance R 2.First power supply, second source, the 3rd power supply are the 12V DC power supply.
Operation principle is as follows:
When the circuit operate as normal, practical switching circuit 1 output low level signal makes the second triode Q2 conducting of high level drive circuit 2, this moment, resistance R 2 left sides were low level, because the second triode Q2 conducting is started working, so second resistance R, 2 right side level are 11.3V, high level signal is externally exported in the second triode Q2 conducting, high level drive circuit 2 operate as normal, short-circuit protection circuit 3 are in off-state and do not work; When the Drive of high level drive circuit 2 pin output shorted to earth; because port shorted to earth; the 6th resistance R 6 upsides are 0V in the short-circuit protection circuit 3, voltage-stabiliser tube D1 conducting work, and (the voltage stabilizing value selects to be lower than supply voltage by stable magnitude of voltage to make the 5th resistance R 5 right sides; ≤ 11.3V); at this moment the 3rd triode Q3 conducting, the 5th resistance R 5 left side 11.3V, the 3rd triode Q3 output high level 12V; the second triode Q2 is ended, thereby play the effect of protection high level drive circuit 2.
Claims (4)
1. short circuit self-lock protection circuit, it is characterized in that, comprise practical switching circuit, high level drive circuit, short-circuit protection circuit, first power supply, second source, the 3rd power supply, described high level drive circuit comprises second triode (Q2), second resistance (R2), the 3rd resistance (R3), and described short-circuit protection circuit comprises the 3rd triode (Q3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), electric capacity (C1), voltage-stabiliser tube (D1);
Described second triode (Q2) comprises base stage, emitter, collector electrode, and its base stage is connected with practical switching circuit by second resistance (R2), and its emitter is connected with first power supply, is connected with base stage by the 3rd resistance (R3) simultaneously; Its collector electrode is connected with the positive pole of voltage-stabiliser tube (D1) by the 6th resistance (R6), and its collector electrode is connected with driven portion Drive;
Described the 3rd triode (Q3) comprises base stage, emitter, collector electrode, and its base stage is connected with second source by electric capacity (C1), the 4th resistance (R4) respectively, and its base stage is connected with the negative pole of voltage-stabiliser tube (D1) by the 5th resistance (R5); Its emitter is connected with the 3rd power supply; Its collector electrode is connected with the base stage of second triode (Q2).
2. a kind of short circuit self-lock protection circuit according to claim 1; it is characterized in that; described practical switching circuit comprises first resistance (R1), first triode (Q1); this first triode (Q1) comprises base stage, emitter, collector electrode; its base stage is connected with MCU by first resistance (R1); its grounded emitter, its collector electrode is connected with second resistance (R2).
3. a kind of short circuit self-lock protection circuit according to claim 1 is characterized in that described first power supply, second source, the 3rd power supply are the identical DC power supply of voltage.
4. a kind of short circuit self-lock protection circuit according to claim 1 is characterized in that described first power supply, second source and the 3rd power source voltage are 5～24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202374529U CN201750125U (en) | 2010-06-24 | 2010-06-24 | Short circuit self-locking protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202374529U CN201750125U (en) | 2010-06-24 | 2010-06-24 | Short circuit self-locking protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201750125U true CN201750125U (en) | 2011-02-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202374529U Expired - Fee Related CN201750125U (en) | 2010-06-24 | 2010-06-24 | Short circuit self-locking protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201750125U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454171A (en) * | 2016-11-15 | 2017-02-22 | 深圳市视维科技有限公司 | Power supply circuit of CA card of set-top-box |
| CN106998056A (en) * | 2017-04-20 | 2017-08-01 | 顺德职业技术学院 | New Hardware diagnoses protection circuit |
| CN107968379A (en) * | 2018-01-17 | 2018-04-27 | 攀枝花学院 | Solid-state direct-current current foldback circuit |
| CN109494679A (en) * | 2018-11-23 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of high side switches circuit with overcurrent protection and feedback control function |
| CN111786356A (en) * | 2020-08-03 | 2020-10-16 | 郑州森鹏电子技术有限公司 | High-side switch circuit |
-
2010
- 2010-06-24 CN CN2010202374529U patent/CN201750125U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454171A (en) * | 2016-11-15 | 2017-02-22 | 深圳市视维科技有限公司 | Power supply circuit of CA card of set-top-box |
| CN106998056A (en) * | 2017-04-20 | 2017-08-01 | 顺德职业技术学院 | New Hardware diagnoses protection circuit |
| CN107968379A (en) * | 2018-01-17 | 2018-04-27 | 攀枝花学院 | Solid-state direct-current current foldback circuit |
| CN107968379B (en) * | 2018-01-17 | 2024-05-17 | 攀枝花学院 | Solid-state direct current protection circuit |
| CN109494679A (en) * | 2018-11-23 | 2019-03-19 | 苏州绿控传动科技股份有限公司 | A kind of high side switches circuit with overcurrent protection and feedback control function |
| CN111786356A (en) * | 2020-08-03 | 2020-10-16 | 郑州森鹏电子技术有限公司 | High-side switch circuit |
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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 |
Granted publication date: 20110216 Termination date: 20150624 |
|
| EXPY | Termination of patent right or utility model |