CN210898497U - Boost output short-circuit protection circuit - Google Patents
Boost output short-circuit protection circuit Download PDFInfo
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- CN210898497U CN210898497U CN202020008200.2U CN202020008200U CN210898497U CN 210898497 U CN210898497 U CN 210898497U CN 202020008200 U CN202020008200 U CN 202020008200U CN 210898497 U CN210898497 U CN 210898497U
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Abstract
The utility model discloses a boost output short-circuit protection circuit, including high-power switch tube Q1, MOS pipe Q2, triode Q3, polarity electric capacity CE1, diode D1, resistance R2, resistance R3, resistance R4, resistance R6, resistance R7 to and constitutions such as electric capacity C1. The utility model provides a boost output short-circuit protection circuit, the circuit can stop the output when the output short circuit, and the circuit need not to provide normal voltage of output and electric current again for consumer just can normally again through the operation of going up electricity again after the outage when the trouble is relieved to can automatic recovery output function when having realized output short circuit automatic protection and trouble are relieved.
Description
Technical Field
The utility model belongs to the electronic circuit field specifically indicates a boost output short-circuit protection circuit.
Background
With the rise of boost functional devices, the output protection function of the boost functional devices becomes more and more important, when consumers use the boost functional devices, no matter what kind of devices the consumers use power supplies such as a boost power supply, or when the consumers accidentally short-circuit the devices, the devices should provide reasonable output disconnection protection functions without harming the consumers, and when the output short-circuit is released, the devices should normally provide output voltage and current.
The boost circuit structure of the present day has the defect of output short circuit, and the output short circuit is equivalent to the short circuit of a power supply, thereby causing great threat to equipment. How to design a circuit structure so that the circuit can realize short-circuit protection and automatically recover power supply without power failure after the fault is relieved is the research direction of various enterprises in the field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned problem, provide a boost output short-circuit protection circuit, the circuit can stop the output when the output short circuit, and when the trouble was relieved the circuit need not to provide normal voltage of output and electric current again through the operation of going up after the outage just can normally for the consumer again to can the automatic recovery function of output when having realized output short circuit automatic protection and trouble and having relieved.
The purpose of the utility model is realized through the following technical scheme:
a boost output short-circuit protection circuit comprises a high-power switching tube Q1, an MOS tube Q2, a triode Q3, a polar capacitor CE1 with a cathode connected with the E end of the triode Q3 and an anode connected with the D end of the MOS tube Q2 through an inductor L1, a diode D1 with a P electrode connected with the D end of the MOS tube Q2 and an N electrode connected with the C end of the triode Q3 through a resistor R1, a resistor R2 with one end connected with the G end of the MOS tube Q2, a resistor R3 with one end connected with the C end of the high-power switching tube Q1 and the other end connected with the B end of the triode Q3 through a resistor R5, a resistor R1 with one end connected with the B end of the triode Q3 and the other end connected with the E end of the high-power switching tube Q1, a resistor R1 with one end connected with the E end of the high-power switching tube Q1 and the other end connected with the resistor R1 in parallel, and a resistor R1 connected with the resistor 1 and a connecting point 1 in parallel, The other end of the capacitor C1 is connected with the end E of the triode Q3.
Preferably, the S terminal of the MOS transistor Q2 is connected to the E terminal of the transistor Q3, and the C terminal of the transistor Q3 is connected to the B terminal of the high power switch Q1.
Furthermore, one end of the resistor R2 is connected to the G terminal of the MOS transistor Q2, and the other end of the resistor R2 is the PWM output terminal.
Still further, the positive electrode of the polar capacitor CE1 is a positive input terminal and is connected to the DC3-12V power supply, and the negative electrode of the polar capacitor CE1 is a negative input terminal and is grounded.
Furthermore, the N terminal of the diode D1 is a positive boost output terminal, and the C terminal of the high-power switch Q1 is a negative boost output terminal.
Preferably, the MOS transistor Q2 is 20N100 in model, the transistor Q3 is S945 in model, and the diode D1 is MBR3045 in model.
Preferably, the inductor L1 has a value of 22 μ H, the resistor R1 has a value of 5K Ω, the resistor R2 has a value of 20 Ω, the resistor R3 has a value of 1K Ω, the resistor R4 has a value of 1K Ω, the resistor R5 has a value of 4.7K omega, the resistor R6 has a value of 0.91 Ω, the resistor R7 has a value of 0.91 Ω, the polar capacitor CE1 has a polar capacitance of 35V/70 μ F, and the capacitor C1 has a capacitance of 103 pF/50V.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses a structure and principle are simple, and the circuit can stop the output when the output short circuit, and when the trouble was relieved the circuit need not to provide normal voltage of output and electric current again for the consumer through the operation of going up after the outage just again to can the automatic recovery function of output when having realized output short circuit automatic protection and trouble and having relieved.
Drawings
Fig. 1 is a circuit structure diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Examples
As shown in fig. 1, a boost output short-circuit protection circuit includes a high-power switch tube Q1, a MOS tube Q2, a triode Q3, a polar capacitor CE1 having a negative electrode connected to the E terminal of the triode Q3 and a positive electrode connected to the D terminal of the MOS tube Q2 through an inductor L1, a diode D1 having a P electrode connected to the D terminal of the MOS tube Q2 and a N electrode connected to the C terminal of the triode Q3 through a resistor R1, a resistor R2 having one end connected to the G terminal of the MOS tube Q2, a resistor R3 having one end connected to the C terminal of the high-power switch tube Q1 and the other end connected to the B terminal of the triode Q3 through a resistor R5, a resistor R4 having one end connected to the B terminal of the triode Q3 and the other end connected to the E terminal of the high-power switch tube Q1, a resistor R7 having one end connected to the E terminal of the high-power switch tube Q1 and the other end connected to the E terminal of the triode Q3, and a resistor R6 and a resistor 7 connected, and a capacitor C1, one end of which is connected with the connection point of the resistor R3 and the resistor R5, and the other end of which is connected with the E end of the triode Q3.
The S end of the MOS transistor Q2 is connected with the E end of the triode Q3, and the C end of the triode Q3 is connected with the B end of the high-power switch transistor Q1.
One end of the resistor R2 is connected to the G end of the MOS transistor Q2, and the other end of the resistor R2 is the PWM output end.
The positive electrode of the polar capacitor CE1 is a positive input end and is connected with a DC3-12V power supply, and the negative electrode of the polar capacitor CE1 is a negative input end and is grounded.
The N pole of the diode D1 is a positive boost output pole, and the C pole of the high-power switch tube Q1 is a negative boost output pole.
The model of the MOS transistor Q2 is 20N100, the model of the triode Q3 is S945, and the model of the diode D1 is MBR 3045.
The high-power switching tube Q1 can be selected according to actual requirements, and the selection of the high-power switching tube Q1 with different models according to different protection voltages and currents of the circuit is the prior art in the field, and a person skilled in the art can complete the specific selection of the high-power switching tube Q1 without creative labor.
The value of the inductor L1 is 22 muH, the value of the resistor R1 is 5K omega, the value of the resistor R2 is 20 omega, the value of the resistor R3 is 1K omega, the value of the resistor R4 is 1K omega, the value of the resistor R5 is 4.7K omega, the value of the resistor R6 is 0.91 omega, the value of the resistor R7 is 0.91 omega, the polar capacitor CE1 is a polar capacitor of 35V/70 muF, and the capacitor C1 is a capacitor of 103 pF/50V.
The specific working principle of the circuit is as follows: when the circuit works normally, the boost output end provides a bias current for the B end of the high-power switching tube Q1 through the resistor R1, so that the high-power switching tube Q1 is conducted, the current passes through the high-power switching tube Q1 from the boost output negative end to the resistor R6 and the resistor R7 and then reaches the ground end of the circuit to complete current loop output, when the boost output positive end and the boost output negative end are short-circuited or the current of a used device is overlarge, the current flowing through the resistor R6 and the resistor R7 is suddenly increased, the E end potential of the high-power switching tube Q1 is increased, the potential provides a bias voltage for the B end of the triode Q3 through the resistor R4 to enable the triode Q3 to be conducted, the B end potential of the high-power switching tube Q1 is reduced to enable the high-power switching tube Q1 to be cut off, and further the circuit. Meanwhile, the other path charges the capacitor C1 through the resistor R5 to maintain the potential of the terminal B of the transistor Q3. When a fault such as a short circuit is relieved, the current flowing through the resistor R6 and the resistor R7 is reduced, the potential of the terminal B of the triode Q3 is reduced to cut off the triode Q3, and the potential of the terminal B of the high-power switching tube Q1 is increased to enable the high-power switching tube Q1 to be conducted, so that the output automatic recovery action of the power supply is completed.
As described above, the utility model discloses alright fine realization.
Claims (8)
1. The boost output short-circuit protection circuit comprises a polar capacitor CE1, an inductor L1, a resistor R1, a resistor R2, a MOS transistor Q2 and a diode D1, and is characterized in that: the high-power switch tube Q1, a triode Q3, a resistor R3 with one end connected with the C end of a high-power switch tube Q1 and the other end connected with the B end of a triode Q3 after passing through a resistor R5, a resistor R4 with one end connected with the B end of a triode Q3 and the other end connected with the E end of a high-power switch tube Q1, a resistor R6 with one end connected with the E end of a high-power switch tube Q1 and the other end connected with the E end of a triode Q3, a resistor R7 connected in parallel with a resistor R6, and a capacitor C1 with one end connected with the connection point of the resistor R3 and the resistor R5 and the other end connected with the E end of a triode Q3.
2. The boost output short-circuit protection circuit according to claim 1, wherein: the negative electrode of the polar capacitor CE1 is connected with the E end of the triode Q3, the positive electrode of the polar capacitor CE1 is connected with the D end of the MOS tube Q2 after passing through the inductor L1, one end of the resistor R2 is connected with the G end of the MOS tube Q2, the P electrode of the diode D1 is connected with the D end of the MOS tube Q2, and the N electrode of the diode D1 is connected with the C end of the triode Q3 after passing through the resistor R1.
3. The boost output short-circuit protection circuit according to claim 2, wherein: the S end of the MOS transistor Q2 is connected with the E end of the triode Q3, and the C end of the triode Q3 is connected with the B end of the high-power switch transistor Q1.
4. A boost output short circuit protection circuit according to claim 3, wherein: one end of the resistor R2 is connected to the G end of the MOS transistor Q2, and the other end of the resistor R2 is the PWM output end.
5. The boost output short-circuit protection circuit according to claim 4, wherein: the positive electrode of the polar capacitor CE1 is a positive input end and is connected with a DC3-12V power supply, and the negative electrode of the polar capacitor CE1 is a negative input end and is grounded.
6. The boost output short-circuit protection circuit according to claim 5, wherein: the N pole of the diode D1 is a positive boost output pole, and the C pole of the high-power switch tube Q1 is a negative boost output pole.
7. The boost output short-circuit protection circuit according to claim 6, wherein: the model of the MOS transistor Q2 is 20N100, the model of the triode Q3 is S945, and the model of the diode D1 is MBR 3045.
8. The boost output short-circuit protection circuit according to claim 7, wherein: the value of the inductor L1 is 22 muH, the value of the resistor R1 is 5K omega, the value of the resistor R2 is 20 omega, the value of the resistor R3 is 1K omega, the value of the resistor R4 is 1K omega, the value of the resistor R5 is 4.7K omega, the value of the resistor R6 is 0.91 omega, the value of the resistor R7 is 0.91 omega, the polar capacitor CE1 is a polar capacitor of 35V/70 muF, and the capacitor C1 is a capacitor of 103 pF/50V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008200.2U CN210898497U (en) | 2020-01-02 | 2020-01-02 | Boost output short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020008200.2U CN210898497U (en) | 2020-01-02 | 2020-01-02 | Boost output short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210898497U true CN210898497U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020008200.2U Active CN210898497U (en) | 2020-01-02 | 2020-01-02 | Boost output short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210898497U (en) |
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2020
- 2020-01-02 CN CN202020008200.2U patent/CN210898497U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |