CN116742571B - Self-adjusting overcurrent protection circuit - Google Patents
Self-adjusting overcurrent protection circuit Download PDFInfo
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- CN116742571B CN116742571B CN202311029597.8A CN202311029597A CN116742571B CN 116742571 B CN116742571 B CN 116742571B CN 202311029597 A CN202311029597 A CN 202311029597A CN 116742571 B CN116742571 B CN 116742571B
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- 238000001514 detection method Methods 0.000 claims abstract description 58
- 238000005070 sampling Methods 0.000 claims abstract description 36
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The invention discloses a self-regulating overcurrent protection circuit which comprises an input voltage detection circuit, an output voltage detection circuit, an overcurrent threshold setting circuit, a current sampling circuit, a comparison circuit and an output switch tube M1, wherein the output end of the input voltage detection circuit and the output end of the output voltage detection circuit are connected with the regulating end of the overcurrent threshold setting circuit, the output end of the overcurrent threshold setting circuit and the input end of the current sampling circuit are respectively connected with the in-phase input end and the opposite-phase input end of the comparison circuit, and the output end of the comparison circuit is connected with the control end of the output switch tube M1. The invention can automatically reduce the overcurrent threshold value when the power supply system is about to overcurrent so as to play an overcurrent protection role in advance, so that the anti-peak voltage when the output switching tube M1 is turned off is not too high.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a self-regulating overcurrent protection circuit.
Background
The over-current protection circuit is an important component of a power supply system (a stabilized voltage power supply and a power supply adapter), and can enable an output switching tube (generally a MOS tube) of the power supply system to be turned off when the output current of the power supply system is overlarge, so that the output of the power supply system is cut off to protect a circuit at the rear end. However, the existing overcurrent protection circuit provided in the power supply system often has a delay problem, that is, when the output current of the power supply system is greater than the set overcurrent threshold, the overcurrent protection circuit needs a certain time to turn off the output switching tube, so when the overcurrent protection circuit turns off the output switching tube, the output current of the power supply system is greater than the set overcurrent threshold, and further, the reverse peak voltage when the output switching tube is turned off is higher, and in order to protect the output switching tube, the rated input voltage range of the power supply system is reduced, or a switching tube with higher withstand voltage is used, which greatly influences the use and cost of the power supply system.
In view of the above, it is necessary to develop a self-regulating overcurrent protection circuit that can automatically lower the overcurrent threshold to perform the overcurrent protection in advance so that the peak-to-peak voltage at the time of turning off the output switching tube is not too high.
Disclosure of Invention
The invention aims to provide a self-regulating overcurrent protection circuit which can automatically reduce an overcurrent threshold value to play an overcurrent protection role in advance so that the anti-peak voltage of an output switching tube when the output switching tube is turned off is not too high.
In order to achieve the above object, the solution of the present invention is:
the self-regulating overcurrent protection circuit comprises an input voltage detection circuit, an output voltage detection circuit, an overcurrent threshold setting circuit, a current sampling circuit, a comparison circuit and an output switch tube M1, wherein the output end of the input voltage detection circuit and the output end of the output voltage detection circuit are connected with the regulating end of the overcurrent threshold setting circuit, the output end of the overcurrent threshold setting circuit and the input end of the current sampling circuit are respectively connected with the in-phase input end and the anti-phase input end of the comparison circuit, and the output end of the comparison circuit is connected with the control end of the output switch tube M1; the input voltage detection circuit is used for detecting whether the input voltage of the power supply system exceeds a set input voltage threshold value; when the input voltage of the power supply system exceeds a set input voltage threshold, the input voltage detection circuit controls the overcurrent threshold setting circuit to reduce the voltage of an overcurrent threshold signal output by the overcurrent threshold setting circuit; the output voltage detection circuit is used for detecting whether the output voltage of the power supply system is lower than a set output voltage threshold value; when the output voltage of the power supply system is lower than the set output voltage threshold value, the output voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit; the current sampling circuit is used for collecting the output current of the power supply system and correspondingly outputting a current sampling signal according to the output current of the power supply system; the comparison circuit is used for comparing the magnitude of the overcurrent threshold signal with the magnitude of the current sampling signal and correspondingly controlling the on-off of the output switch tube M1; when the current sampling signal is larger than the overcurrent threshold signal, the comparison circuit controls the output switching tube M1 to be turned off.
The input voltage detection circuit comprises a resistor R11, a resistor R12, a resistor R13 and a comparator U11; the first end of the resistor R11 is connected with the input voltage threshold signal Vth1, the second end of the resistor R11 is connected with the first end of the resistor R12, the first end of the resistor R13 and the non-inverting input end of the comparator U11, the second end of the resistor R12 is connected with the control power VCC, the second end of the resistor R13 and the output end of the comparator U11 are connected with the output end of the input voltage detection circuit, and the inverting input end of the comparator U11 is connected with the input end of the input voltage detection circuit.
The output voltage detection circuit comprises a resistor R21, a resistor R22, a resistor R23 and a comparator U21; the first end of the resistor R21 is connected with the input end of the voltage detection circuit, the second end of the resistor R21 is connected with the first end of the resistor R22, the first end of the resistor R23 and the non-inverting input end of the comparator U21, the second end of the resistor R22 is grounded, the second end of the resistor R23 and the output end of the comparator U21 are connected with the output end of the output voltage detection circuit, and the inverting input end of the comparator U21 is connected with the output voltage threshold signal Vth2.
When the input voltage of the power supply system exceeds a set input voltage threshold, the input voltage detection circuit inputs a low level to the regulating end of the overcurrent threshold setting circuit; when the output voltage of the power supply system is lower than the set output voltage threshold, the output voltage detection circuit inputs a low level to the regulating end of the overcurrent threshold setting circuit; the overcurrent threshold setting circuit comprises a resistor R31, a resistor R32, a resistor R33, a resistor R34 and a triode Q31; the first end of the resistor R31 is connected with the driving power supply VDD, the second end of the resistor R31 and the base electrode of the triode Q31 are connected with the adjusting end of the overcurrent threshold setting circuit, the collector electrode of the triode Q31 is grounded through the resistor R32, the emitter electrode of the triode Q31, the first end of the resistor R33 and the first end of the resistor R34 are connected with the output end of the overcurrent threshold setting circuit, the second end of the resistor R33 is connected with the control power supply VCC, and the second end of the resistor R34 is grounded.
The current sampling circuit comprises a resistor R41, and two ends of the resistor R41 are respectively connected with the input end and the output end of the current sampling circuit.
The comparison circuit comprises a resistor R51 and a comparator U51, wherein a first end of the resistor R51 and a non-inverting input end of the comparator U51 are connected with the non-inverting input end of the comparison circuit, a second end of the resistor R51 and an output end of the comparator U51 are connected with the output end of the comparison circuit, and an inverting input end of the comparator U51 is connected with the inverting input end of the comparison circuit.
The output end of the comparison circuit is connected with the voltage stabilizing circuit.
The voltage stabilizing circuit comprises a resistor R61 and a capacitor C61, wherein a first end of the resistor R61 is connected with a control power supply VCC, a second end of the resistor R61 and a first end of the capacitor C61 are connected with an output end of the comparison circuit, and a second end of the capacitor C61 is grounded.
The self-regulating overcurrent protection circuit further comprises an MCU control circuit, the output end of the MCU control circuit and the output end of the comparison circuit are connected with the output switch tube M1 through an AND gate circuit, the first input end and the second input end of the AND gate circuit are respectively connected with the output end of the comparison circuit and the output end of the MCU control circuit, and the output end of the AND gate circuit is connected with the control end of the output switch tube M1.
The output end of the comparison circuit is connected with the first input end of the AND gate circuit through a resistor R91 and a diode D91, the negative electrode of the diode D91 is connected with the output end of the comparison circuit, the positive electrode of the diode D91 is connected with the first end of the resistor R91 and the first input end of the AND gate circuit, and the second end of the resistor R91 is connected with a control power supply VCC.
After the scheme is adopted, when the input voltage of the power supply system exceeds a set input voltage threshold value, the power supply system is in a state to be overcurrent at the moment, and the input voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit (namely automatically reduce the overcurrent threshold value), so that the comparison circuit controls the output switch tube M1 to be turned off when the current sampling signal output by the current sampling circuit is greater than the overcurrent threshold value signal after the voltage is reduced, and the self-adjusting overcurrent protection circuit can control the output switch tube M1 to be turned off before the overcurrent of the power supply system, and further the self-adjusting overcurrent protection circuit can play an overcurrent protection role in advance; when the output voltage of the power supply system is lower than a set output voltage threshold value, the power supply system is in a state of about to overcurrent, and the output voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit (namely, automatically reduces the overcurrent threshold value), so that the comparison circuit controls the output switch tube M1 to be turned off when the current sampling signal output by the current sampling circuit is greater than the overcurrent threshold value signal after the voltage is reduced, and the self-adjustment overcurrent protection circuit can control the output switch tube M1 to be turned off before the overcurrent of the power supply system, so that the self-adjustment overcurrent protection circuit can play an overcurrent protection role in advance.
From the above, the invention can automatically reduce the overcurrent threshold when the power supply system is about to overcurrent so as to play an overcurrent protection role in advance, so that the anti-peak voltage of the output switching tube M1 when the output switching tube M1 is turned off is not too high.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
As shown in fig. 1, the invention discloses a self-regulating overcurrent protection circuit, which comprises an input voltage detection circuit, an output voltage detection circuit, an overcurrent threshold setting circuit, a current sampling circuit, a comparison circuit and an output switch tube M1, wherein the output end of the input voltage detection circuit and the output end of the output voltage detection circuit are connected with the regulating end of the overcurrent threshold setting circuit, the output end of the overcurrent threshold setting circuit and the input end of the current sampling circuit are respectively connected with the non-inverting input end and the inverting input end of the comparison circuit, and the output end of the comparison circuit is connected with the control end of the output switch tube M1; the input voltage detection circuit is used for detecting whether the input voltage of the power supply system exceeds a set input voltage threshold value, and when the input voltage of the power supply system exceeds the set input voltage threshold value, the input voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit; the output voltage detection circuit is used for detecting whether the output voltage of the power supply system is lower than a set output voltage threshold value, and when the output voltage of the power supply system is lower than the set output voltage threshold value, the output voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit; the current sampling circuit is used for collecting the output current of the power supply system and correspondingly outputting a current sampling signal according to the output current of the power supply system; the comparison circuit is used for comparing the magnitude of the overcurrent threshold signal with the magnitude of the current sampling signal and correspondingly controlling the on-off of the output switch tube M1; when the current sampling signal is larger than the overcurrent threshold signal, the comparison circuit controls the output switching tube M1 to be turned off.
The working principle of the invention is as follows: when the input voltage of the power supply system exceeds a set input voltage threshold value, the power supply system is in an over-current state at the moment, and the input voltage detection circuit controls the over-current threshold value setting circuit to reduce the voltage of an over-current threshold value signal output by the over-current threshold value setting circuit (namely, automatically reduces the over-current threshold value), so that the comparison circuit controls the output switch tube M1 to be turned off when the current sampling signal output by the current sampling circuit is larger than the over-current threshold value signal after the voltage is reduced, and the self-adjustment over-current protection circuit can control the output switch tube M1 to be turned off before the power supply system is over-current, and further the self-adjustment over-current protection circuit can play an over-current protection role in advance; when the output voltage of the power supply system is lower than a set output voltage threshold value, the power supply system is in a state of about to overcurrent, and the output voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit (namely, automatically reduces the overcurrent threshold value), so that the comparison circuit controls the output switch tube M1 to be turned off when the current sampling signal output by the current sampling circuit is greater than the overcurrent threshold value signal after the voltage is reduced, and the self-adjustment overcurrent protection circuit can control the output switch tube M1 to be turned off before the overcurrent of the power supply system, so that the self-adjustment overcurrent protection circuit can play an overcurrent protection role in advance. From the foregoing, the present invention can automatically reduce the overcurrent threshold when the power supply system is about to overcurrent, so as to play an overcurrent protection role in advance, so that the peak-to-peak voltage when the output switching tube M1 is turned off is not too high. The input voltage threshold and the output voltage threshold can be generally set according to actual requirements according to product application.
In an embodiment of the present invention, the input voltage detection circuit includes a resistor R11, a resistor R12, a resistor R13, and a comparator U11; the first end of the resistor R11 is connected with an input voltage threshold signal Vth1, the second end of the resistor R11 is connected with the first end of the resistor R12, the first end of the resistor R13 and the non-inverting input end of the comparator U11, the second end of the resistor R12 is connected with the control power VCC, the second end of the resistor R13 and the output end of the comparator U11 are connected with the output end of the input voltage detection circuit, and the inverting input end of the comparator U11 is connected with the input end of the input voltage detection circuit; the inverting input of the comparator U11 may be grounded through a capacitor C11, and the capacitor C11 may stabilize the voltage of the inverting input of the comparator U11. When the input voltage of the power supply system exceeds a set input voltage threshold (i.e., the voltage of the input voltage threshold signal Vth 1), the input voltage detection circuit inputs a low level to the adjustment terminal of the overcurrent threshold setting circuit, thereby controlling the overcurrent threshold setting circuit to reduce the voltage of the overcurrent threshold signal output by the overcurrent threshold setting circuit.
In an embodiment of the present invention, the output voltage detection circuit includes a resistor R21, a resistor R22, a resistor R23, and a comparator U21; the first end of the resistor R21 is connected with the input end of the voltage detection circuit, the second end of the resistor R21 is connected with the first end of the resistor R22, the first end of the resistor R23 and the non-inverting input end of the comparator U21, the second end of the resistor R22 is grounded, the second end of the resistor R23 and the output end of the comparator U21 are connected with the output end of the output voltage detection circuit, and the inverting input end of the comparator U21 is connected with the output voltage threshold signal Vth2; the inverting input of the comparator U21 may be grounded through a capacitor C21, and the capacitor C21 may stabilize the voltage of the inverting input of the comparator U21. When the output voltage of the power supply system is lower than the set output voltage threshold (i.e., the voltage of the output voltage threshold signal Vth 2), the output voltage detection circuit inputs a low level to the adjustment terminal of the overcurrent threshold setting circuit, thereby controlling the overcurrent threshold setting circuit to reduce the voltage of the overcurrent threshold signal output by the overcurrent threshold setting circuit.
In an embodiment of the present invention, the overcurrent threshold setting circuit includes a resistor R31, a resistor R32, a resistor R33, a resistor R34, and a transistor Q31; the first end of the resistor R31 is connected with the driving power supply VDD, the second end of the resistor R31 and the base electrode of the triode Q31 are connected with the adjusting end of the overcurrent threshold setting circuit, the collector electrode of the triode Q31 is grounded through the resistor R32, the emitter electrode of the triode Q31, the first end of the resistor R33 and the first end of the resistor R34 are connected with the output end of the overcurrent threshold setting circuit, the second end of the resistor R33 is connected with the control power supply VCC, and the second end of the resistor R34 is grounded. When the input voltage detection circuit or the output voltage detection circuit inputs a low level to the adjusting end of the overcurrent threshold setting circuit, the triode Q31 is conducted at this time to enable the resistor R32 and the resistor R34 to be connected in parallel, so that the voltage of the output end of the overcurrent threshold setting circuit, namely the voltage of an overcurrent threshold signal output by the overcurrent threshold setting circuit, is reduced.
In the embodiment of the invention, the current sampling circuit comprises a resistor R41, two ends of the resistor R41 are respectively connected with the input end and the output end of the current sampling circuit, the output end of the current sampling circuit can be grounded through a capacitor C41, and the capacitor C41 can stabilize the voltage of the output end of the current sampling circuit.
In an embodiment of the present invention, the comparing circuit includes a resistor R51 and a comparator U51, a first end of the resistor R51 and a non-inverting input end of the comparator U51 are connected to the non-inverting input end of the comparing circuit, a second end of the resistor R51 and an output end of the comparator U51 are connected to the output end of the comparing circuit, and an inverting input end of the comparator U51 is connected to the inverting input end of the comparing circuit.
In the embodiment of the invention, the output end of the comparison circuit is connected with the voltage stabilizing circuit, and the voltage stabilizing circuit can stabilize the output voltage of the comparison circuit and reduce the fluctuation of the output voltage of the comparison circuit. Specifically, the voltage stabilizing circuit includes a resistor R61 and a capacitor C61, where a first end of the resistor R61 is connected to the control power VCC, a second end of the resistor R61 and a first end of the capacitor C61 are connected to an output end of the comparison circuit, and a second end of the capacitor C61 is grounded.
In the embodiment of the invention, the self-regulating overcurrent protection circuit further comprises an MCU control circuit, the output end of the MCU control circuit and the output end of the comparison circuit are connected with the output switch tube M1 through an AND gate circuit, the first input end and the second input end of the AND gate circuit are respectively connected with the output end of the comparison circuit and the output end of the MCU control circuit, and the output end of the AND gate circuit is connected with the control end of the output switch tube M1. The MCU control circuit can also play a role in controlling the output switch tube M1; in normal state, the MCU control circuit outputs high level to the AND gate circuit, so that the output switch tube M1 is controlled by the comparison circuit. Wherein the MCU control circuit may comprise an MCU processor U71; the and gate circuit may include an and gate U81 and a resistor R81, where two input ends of the and gate U81 are respectively connected to a first input end and a second input end of the and gate circuit, and an output end of the and gate U81 is connected to an output end of the and gate circuit through the resistor R81.
In the embodiment of the invention, the output end of the comparison circuit is connected with the first input end of the AND gate circuit through a resistor R91 and a diode D91, the cathode of the diode D91 is connected with the output end of the comparison circuit, the anode of the diode D91 is connected with the first end of the resistor R91 and the first input end of the AND gate circuit, and the second end of the resistor R91 is connected with a control power supply VCC.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (7)
1. A self-regulating overcurrent protection circuit, characterized in that: the device comprises an input voltage detection circuit, an output voltage detection circuit, an overcurrent threshold setting circuit, a current sampling circuit, a comparison circuit and an output switch tube M1, wherein the output end of the input voltage detection circuit and the output end of the output voltage detection circuit are connected with the regulating end of the overcurrent threshold setting circuit, the output end of the overcurrent threshold setting circuit and the input end of the current sampling circuit are respectively connected with the in-phase input end and the anti-phase input end of the comparison circuit, and the output end of the comparison circuit is connected with the control end of the output switch tube M1;
the input voltage detection circuit is used for detecting whether the input voltage of the power supply system exceeds a set input voltage threshold value; when the input voltage of the power supply system exceeds a set input voltage threshold, the input voltage detection circuit controls the overcurrent threshold setting circuit to reduce the voltage of an overcurrent threshold signal output by the overcurrent threshold setting circuit;
the output voltage detection circuit is used for detecting whether the output voltage of the power supply system is lower than a set output voltage threshold value; when the output voltage of the power supply system is lower than the set output voltage threshold value, the output voltage detection circuit controls the overcurrent threshold value setting circuit to reduce the voltage of an overcurrent threshold value signal output by the overcurrent threshold value setting circuit;
the current sampling circuit is used for collecting the output current of the power supply system and correspondingly outputting a current sampling signal according to the output current of the power supply system;
the comparison circuit is used for comparing the magnitude of the overcurrent threshold signal with the magnitude of the current sampling signal and correspondingly controlling the on-off of the output switch tube M1; when the current sampling signal is larger than the overcurrent threshold signal, the comparison circuit controls the output switching tube M1 to be turned off;
the input voltage detection circuit comprises a resistor R11, a resistor R12, a resistor R13 and a comparator U11; the first end of the resistor R11 is connected with an input voltage threshold signal Vth1, the second end of the resistor R11 is connected with the first end of the resistor R12, the first end of the resistor R13 and the non-inverting input end of the comparator U11, the second end of the resistor R12 is connected with the control power VCC, the second end of the resistor R13 and the output end of the comparator U11 are connected with the output end of the input voltage detection circuit, and the inverting input end of the comparator U11 is connected with the input end of the input voltage detection circuit;
the output voltage detection circuit comprises a resistor R21, a resistor R22, a resistor R23 and a comparator U21; the first end of the resistor R21 is connected with the input end of the voltage detection circuit, the second end of the resistor R21 is connected with the first end of the resistor R22, the first end of the resistor R23 and the non-inverting input end of the comparator U21, the second end of the resistor R22 is grounded, the second end of the resistor R23 and the output end of the comparator U21 are connected with the output end of the output voltage detection circuit, and the inverting input end of the comparator U21 is connected with the output voltage threshold signal Vth2;
when the input voltage of the power supply system exceeds a set input voltage threshold, the input voltage detection circuit inputs a low level to the regulating end of the overcurrent threshold setting circuit; when the output voltage of the power supply system is lower than the set output voltage threshold, the output voltage detection circuit inputs a low level to the regulating end of the overcurrent threshold setting circuit;
the overcurrent threshold setting circuit comprises a resistor R31, a resistor R32, a resistor R33, a resistor R34 and a triode Q31; the first end of the resistor R31 is connected with the driving power supply VDD, the second end of the resistor R31 and the base electrode of the triode Q31 are connected with the adjusting end of the overcurrent threshold setting circuit, the collector electrode of the triode Q31 is grounded through the resistor R32, the emitter electrode of the triode Q31, the first end of the resistor R33 and the first end of the resistor R34 are connected with the output end of the overcurrent threshold setting circuit, the second end of the resistor R33 is connected with the control power supply VCC, and the second end of the resistor R34 is grounded.
2. A self-regulating, over-current protection circuit as defined in claim 1, wherein: the current sampling circuit comprises a resistor R41, and two ends of the resistor R41 are respectively connected with the input end and the output end of the current sampling circuit.
3. A self-regulating, over-current protection circuit as defined in claim 1, wherein: the comparison circuit comprises a resistor R51 and a comparator U51, wherein a first end of the resistor R51 and a non-inverting input end of the comparator U51 are connected with the non-inverting input end of the comparison circuit, a second end of the resistor R51 and an output end of the comparator U51 are connected with the output end of the comparison circuit, and an inverting input end of the comparator U51 is connected with the inverting input end of the comparison circuit.
4. A self-regulating over-current protection circuit as claimed in claim 1 or 3, wherein: the output end of the comparison circuit is connected with the voltage stabilizing circuit.
5. A self-regulating, over-current protection circuit according to claim 4, wherein: the voltage stabilizing circuit comprises a resistor R61 and a capacitor C61, wherein a first end of the resistor R61 is connected with a control power supply VCC, a second end of the resistor R61 and a first end of the capacitor C61 are connected with an output end of the comparison circuit, and a second end of the capacitor C61 is grounded.
6. A self-regulating, over-current protection circuit as defined in claim 1, wherein: the output end of the MCU control circuit and the output end of the comparison circuit are connected with the output switch tube M1 through the AND gate circuit, the first input end and the second input end of the AND gate circuit are respectively connected with the output end of the comparison circuit and the output end of the MCU control circuit, and the output end of the AND gate circuit is connected with the control end of the output switch tube M1.
7. A self-regulating, over-current protection circuit according to claim 6, wherein: the output end of the comparison circuit is connected with the first input end of the AND gate circuit through a resistor R91 and a diode D91, the negative electrode of the diode D91 is connected with the output end of the comparison circuit, the positive electrode of the diode D91 is connected with the first end of the resistor R91 and the first input end of the AND gate circuit, and the second end of the resistor R91 is connected with a control power supply VCC.
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| CN202311029597.8A CN116742571B (en) | 2023-08-16 | 2023-08-16 | Self-adjusting overcurrent protection circuit |
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| CN202311029597.8A CN116742571B (en) | 2023-08-16 | 2023-08-16 | Self-adjusting overcurrent protection circuit |
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| CN116742571B true CN116742571B (en) | 2023-11-21 |
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| US10348079B2 (en) * | 2015-08-27 | 2019-07-09 | Rohm Co., Ltd. | Overcurrent protective device, electronic apparatus, integrated circuit, and signal transmission circuit |
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