CN215897700U - MOS manages consumption auto-lock protection circuit - Google Patents
MOS manages consumption auto-lock protection circuit Download PDFInfo
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- CN215897700U CN215897700U CN202121595870.XU CN202121595870U CN215897700U CN 215897700 U CN215897700 U CN 215897700U CN 202121595870 U CN202121595870 U CN 202121595870U CN 215897700 U CN215897700 U CN 215897700U
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Abstract
The utility model provides a MOS tube power consumption self-locking protection circuit in the technical field of linear power supply control, which comprises a voltage difference detection circuit, a voltage difference comparison circuit, an enabling circuit, a start-control current comparison circuit, a maximum current comparison circuit, a reset circuit and an MCU (microprogrammed control unit); the input end of the differential pressure comparison circuit is connected with the output end of the differential pressure detection circuit, and the output end of the differential pressure comparison circuit is connected with the enabling circuit; the input ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the MCU, and the output ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the enabling circuit; the MCU is respectively connected with the differential pressure detection circuit, the differential pressure comparison circuit and the enabling circuit; the input end of the reset circuit is connected with the MCU, and the output end of the reset circuit is connected with the start control current comparison circuit and the maximum current comparison circuit. The utility model has the advantages that: the dynamic control on the voltage difference and the current of the MOS tube is realized, and the service life of the MOS tube is greatly prolonged.
Description
Technical Field
The utility model relates to the technical field of linear power supply control, in particular to a power consumption self-locking protection circuit of an MOS (metal oxide semiconductor) tube.
Background
At present, the MOS pipe power consumption control in the linear power supply is only the voltage difference at both ends of the control MOS pipe, and the current flowing through the MOS pipe is controlled by another control module, the voltage difference and the current are separately controlled, so that the whole control circuit and the control logic are complex, and the voltage difference value and the current value adopt fixed values, which cannot be adjusted, the hardware cannot be self-locked, and can only be matched with the software self-locking, so that the whole power consumption control of the MOS pipe is hiccup type protection, and the loss of the MOS pipe device is large.
Therefore, how to provide a MOS transistor power consumption self-locking protection circuit, the dynamic control is performed on the voltage difference and the current of the MOS transistor at the same time, the service life of the MOS transistor is prolonged, and a problem to be solved urgently is formed.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a power consumption self-locking protection circuit of an MOS (metal oxide semiconductor) tube, which realizes the simultaneous dynamic control of the voltage difference and the current of the MOS tube and prolongs the service life of the MOS tube.
The utility model provides a power consumption self-locking protection circuit of an MOS (metal oxide semiconductor) tube, which comprises a voltage difference detection circuit, a voltage difference comparison circuit, an enabling circuit, a start-control current comparison circuit, a maximum current comparison circuit, a reset circuit and an MCU (micro control unit);
the input end of the differential pressure comparison circuit is connected with the output end of the differential pressure detection circuit, and the output end of the differential pressure comparison circuit is connected with the enabling circuit; the input ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the MCU, and the output ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the enabling circuit; the MCU is respectively connected with the differential pressure detection circuit, the differential pressure comparison circuit and the enabling circuit; the input end of the reset circuit is connected with the MCU, and the output end of the reset circuit is connected with the start control current comparison circuit and the maximum current comparison circuit.
Further, the voltage difference detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R7, a resistor R8 and an operational amplifier U1B;
a pin 5 of the operational amplifier U1B is connected with a resistor R2 and a resistor R7, a pin 6 is connected with a resistor R1 and a resistor R3, and a pin 7 is connected with a resistor R3, a resistor R8 and a differential pressure comparison circuit; the resistor R7 and the resistor R8 are both grounded; the resistor R2 is connected with the MCU.
Further, the differential voltage comparison circuit comprises a resistor R4, a resistor R5, a resistor R5, a capacitor C1 and an operational amplifier U1A;
the pin 1 of the operational amplifier U1A is connected with the resistor R6 and the enabling circuit, the pin 2 is connected with the resistor R4, and the pin 3 is connected with the resistor R5 and the capacitor C1; the resistor R5 is connected with a differential pressure detection circuit; the resistor R4 is connected with the MCU; the resistor R6 and the capacitor C1 are both grounded.
Furthermore, the enabling circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C2, an optical coupler U4 and a MOS tube Q1;
a pin 1 of the optocoupler U4 is connected with a resistor R11 and a resistor R12, a pin 2 is connected with a resistor R12 and grounded, a pin 3 is connected with a voltage difference comparison circuit, and a pin 4 is connected with a resistor R13 and a maximum current comparison circuit; the resistor R11 is connected with the start-control current comparison circuit; the gate of the MOS transistor Q1 is connected to the resistor R13, the resistor R14, and the capacitor C2, and the source is connected to the resistor R14 and the capacitor C2 and grounded.
Further, the start-up control current comparison circuit comprises a resistor R15, a resistor R16, a resistor R20, a resistor R24, a diode D2, a light-emitting diode LED2 and an operational amplifier U3;
pin 1 of the operational amplifier U3 is connected with the input end of the diode D2 and the input end of the light-emitting diode LED2, pin 3 is connected with the resistor R24, and pin 4 is connected with the resistor R15; the resistor R15 is connected with the MCU; one end of the resistor R20 is connected with the resistor 16, the resistor R24 and the reset circuit, and the other end of the resistor R20 is connected with the output end of the diode D2; the output end of the light emitting diode LED2 is connected with an enabling circuit.
Further, the maximum current comparison circuit includes a resistor R9, a resistor R10, a resistor R19, a resistor R23, a diode D1, a light emitting diode LED1, and an operational amplifier U2;
pin 1 of the operational amplifier U2 is connected with the input end of the diode D1 and the input end of the light-emitting diode LED1, pin 3 is connected with the resistor R23, and pin 4 is connected with the resistor R9; the resistor R9 is connected with the MCU; one end of the resistor R19 is connected with the resistor 10, the resistor R23 and the reset circuit, and the other end of the resistor R19 is connected with the output end of the diode D1; the output end of the light emitting diode LED1 is connected with an enabling circuit.
Further, the reset circuit includes a resistor R17, a resistor R18, a resistor R21, a resistor R22, a MOS transistor Q2, and a MOS transistor Q3;
the drain electrode of the MOS transistor Q2 is connected with the start-control current comparison circuit, the source electrode of the MOS transistor Q2 is connected with the resistor R18 and grounded, and the grid electrode of the MOS transistor Q2 is connected with the resistor R17 and the resistor R18; the resistor R17 is connected with the MCU;
the drain electrode of the MOS transistor Q3 is connected with the maximum current comparison circuit, the source electrode is connected with the resistor R22 and is grounded, and the grid electrode is connected with the resistor R21 and the resistor R22; the resistor R21 is connected with the MCU.
The utility model has the advantages that:
by arranging a differential pressure detection circuit and a differential pressure comparison circuit, the differential pressure detection circuit outputs a voltage difference FV _ DEF to the differential pressure comparison circuit, and the differential pressure comparison circuit outputs a signal CONB to an enabling circuit by comparing the voltage difference FV _ DEF with a protection differential pressure control value VPRO _ SET SET by the MCU; comparing the output current value FB _ IOUT with a start control current control value IPRO _ SET _ MIN SET by the MCU by a start control current comparison circuit to output a signal CONA to an enabling circuit; comparing the output current value FB _ IOUT with the maximum current control value IPRO _ SET _ MAX SET by the MCU by setting a maximum current comparison circuit to output a signal CONBB to an enabling circuit; when the signal CONB and the signal CONA are both at a high level, a pin 4 of the optocoupler U4 can be driven to output a high level, and then the drain of the MOS transistor Q1 of the enabling circuit is driven to output a low-level signal PRO _ AB to turn off the output of the linear power supply; when the signal CONB is at a low level and cannot drive the pin 4 of the optocoupler U4 to output a high level, as long as the signal CONBB is at a high level, the drain of the MOS transistor Q1 of the drivable enabling circuit outputs a signal PRO _ AB at a low level to turn off the output of the linear power supply; and protection pressure difference control value VPRO _ SET, start accuse current control value IPRO _ SET _ MIN, maximum current control value IPRO _ SET _ MAX all can be SET up as required by MCU, realize controlling voltage difference and electric current simultaneously promptly, the value of the voltage difference of control and electric current can SET up as required, just the output of turn-off linear power supply is exceeded the control value to voltage difference or electric current, get into auto-lock protection state, avoid MOS pipe damage, finally realize carrying out dynamic control simultaneously to the voltage difference and the electric current of MOS pipe, very big extension the life of MOS pipe.
Drawings
The utility model will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit block diagram of a power consumption self-locking protection circuit of a MOS transistor according to the present invention.
Fig. 2 is a circuit diagram of the differential pressure detecting circuit of the present invention.
FIG. 3 is a circuit diagram of a differential pressure comparison circuit of the present invention.
Fig. 4 is a circuit diagram of an enable circuit of the present invention.
FIG. 5 is a circuit diagram of the start-up current comparison circuit of the present invention.
Fig. 6 is a circuit diagram of the maximum current comparison circuit of the present invention.
Fig. 7 is a circuit diagram of the reset circuit of the present invention.
Fig. 8 is a circuit diagram of the MCU of the present invention.
Fig. 9 is a flow chart of the working principle of the present invention.
Detailed Description
The technical scheme in the embodiment of the application has the following general idea: monitoring the voltage difference by arranging a voltage difference detection circuit and a voltage difference comparison circuit, and outputting a signal CONB to an enabling circuit; setting a start-control current comparison circuit and a maximum current comparison circuit to monitor the current, and respectively outputting a signal CONA and a signal CONBB to an enabling circuit; the enabling circuit can control the level of the drain output of the MOS tube Q1 based on input signals CONB, CONA and CONBB, and the output of the linear power supply is turned off when the low level is output; the protection differential pressure control value VPRO _ SET, the start control current control value IPRO _ SET _ MIN and the maximum current control value IPRO _ SET _ MAX which are compared by the differential pressure comparison circuit, the start control current comparison circuit and the maximum current comparison circuit can be SET by the MCU according to needs, so that the compatibility is strong, the dynamic control on the voltage difference and the current of the MOS tube is finally realized, and the service life of the MOS tube is prolonged.
Referring to fig. 1 to 9, a preferred embodiment of a power consumption self-locking protection circuit for MOS transistors according to the present invention includes a voltage difference detection circuit, a voltage difference comparison circuit, an enable circuit, a start-control current comparison circuit, a maximum current comparison circuit, a reset circuit, and an MCU;
the voltage difference detection circuit is used for comparing an output voltage value FB _ VOUT of the linear power supply with a front end voltage value VF _ MOS of a MOS tube of the linear power supply and outputting a voltage difference FV _ DEF to the voltage difference comparison circuit; the voltage difference comparison circuit is used for comparing a voltage difference FV _ DEF with a protection voltage difference control value VPRO _ SET SET by the MCU, and further outputting a signal CONB to the enabling circuit; the start-control current comparison circuit is used for comparing an output current value FB _ IOUT of the linear power supply with a start-control current control value IPRO _ SET _ MIN SET by the MCU, and further outputting a signal CONA to the enabling circuit; the maximum current comparison circuit is used for comparing an output current value FB _ IOUT of the linear power supply with a maximum current control value IPRO _ SET _ MAX SET by the MCU, and further outputting a signal CONBB to the enabling circuit; the enabling circuit is used for outputting a high level or a low level based on the received signals CONA, CONB and CONBB, and turning off the output of the linear power supply when the low level is output; the reset circuit is used for receiving a control signal of the MCU to control the start-control current comparison circuit and the maximum current comparison circuit to output low levels, so that the enable circuit outputs high levels and the output of the linear power supply is recovered; the MCU is used to control the operation of the self-locking protection circuit, and in the specific implementation, it is only necessary to select the MCU capable of implementing this function from the prior art, and is not limited to what type, for example, STM32F405RGT6, and the control program is well known to those skilled in the art, which is available to those skilled in the art without creative work.
The input end of the differential pressure comparison circuit is connected with the output end of the differential pressure detection circuit, and the output end of the differential pressure comparison circuit is connected with the enabling circuit; the input ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the MCU, and the output ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the enabling circuit; the MCU is respectively connected with the differential pressure detection circuit, the differential pressure comparison circuit and the enabling circuit; the input end of the reset circuit is connected with the MCU, and the output end of the reset circuit is connected with the start control current comparison circuit and the maximum current comparison circuit.
The voltage difference detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R7, a resistor R8 and an operational amplifier U1B; the model of the operational amplifier U1B is preferably ADA 4522-2;
a pin 5 of the operational amplifier U1B is connected with a resistor R2 and a resistor R7, a pin 6 is connected with a resistor R1 and a resistor R3, and a pin 7 is connected with a resistor R3, a resistor R8 and a resistor R5 of a differential pressure comparison circuit; the resistor R7 and the resistor R8 are both grounded; the resistor R2 is connected with the MCU; the resistor R1 is connected with a voltage sampling point of the linear power supply.
The voltage difference comparison circuit comprises a resistor R4, a resistor R5, a resistor R5, a capacitor C1 and an operational amplifier U1A; the model of the operational amplifier U1A is preferably ADA 4522-2;
a pin 1 of the operational amplifier U1A is connected with a resistor R6 and a pin 3 of an optocoupler U4 of an enabling circuit, a pin 2 is connected with a resistor R4, and the pin 3 is connected with a resistor R5 and a capacitor C1; the resistor R5 is connected with a pin 7 of an operational amplifier U1B of the differential pressure detection circuit; the resistor R4 is connected with the MCU; the resistor R6 and the capacitor C1 are both grounded.
The enabling circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C2, an optical coupler U4 and a MOS tube Q1; the type of the optical coupler U4 is preferably AQY 212S; the type of the MOS tube Q1 is preferably NCE 2312;
pin 1 of the optocoupler U4 is connected with a resistor R11 and a resistor R12, pin 2 is connected with a resistor R12 and grounded, pin 3 is connected with pin 1 of an operational amplifier U1A of the differential pressure comparison circuit, and pin 4 is connected with a resistor R13 and the output end of a light emitting diode LED1 of the maximum current comparison circuit; the resistor R11 is connected with the output end of the light emitting diode LED2 of the start-control current comparison circuit; the gate of the MOS transistor Q1 is connected to the resistor R13, the resistor R14 and the capacitor C2, the source is connected to the resistor R14 and the capacitor C2 and grounded, and the drain is connected to the control terminal of the linear power supply.
The start-up control current comparison circuit comprises a resistor R15, a resistor R16, a resistor R20, a resistor R24, a diode D2, a light-emitting diode LED2 and an operational amplifier U3; the model of the operational amplifier U3 is preferably OPA 188;
pin 1 of the operational amplifier U3 is connected with the input end of the diode D2 and the input end of the light-emitting diode LED2, pin 3 is connected with the resistor R24, and pin 4 is connected with the resistor R15; the resistor R15 is connected with the MCU; one end of the resistor R20 is connected with the resistor 16, the resistor R24 and the reset circuit, and the other end of the resistor R20 is connected with the output end of the diode D2; the output end of the light emitting diode LED2 is connected with a resistor R11 of an enabling circuit; the resistor R16 is connected with a current sampling point of the linear power supply.
The maximum current comparison circuit comprises a resistor R9, a resistor R10, a resistor R19, a resistor R23, a diode D1, a light-emitting diode LED1 and an operational amplifier U2; the model of the operational amplifier U2 is preferably OPA 188;
pin 1 of the operational amplifier U2 is connected with the input end of the diode D1 and the input end of the light-emitting diode LED1, pin 3 is connected with the resistor R23, and pin 4 is connected with the resistor R9; the resistor R9 is connected with the MCU; one end of the resistor R19 is connected with the resistor 10, the resistor R23 and the reset circuit, and the other end of the resistor R19 is connected with the output end of the diode D1; the output end of the light emitting diode LED1 is connected with a pin 4 of an optocoupler U4 of an enabling circuit; the resistor R10 is connected with a current sampling point of the linear power supply.
The reset circuit comprises a resistor R17, a resistor R18, a resistor R21, a resistor R22, a MOS transistor Q2 and a MOS transistor Q3; the models of the MOS transistor Q2 and the MOS transistor Q3 are preferably NCE 2312;
the drain electrode of the MOS transistor Q2 is connected with a resistor R16, a resistor R20 and a resistor R24 of the start-control current comparison circuit, the source electrode is connected with the resistor R18 and is grounded, and the grid electrode is connected with the resistor R17 and the resistor R18; the resistor R17 is connected with the MCU;
the drain of the MOS transistor Q3 is connected with a resistor R10, a resistor R19 and a resistor R23 of the maximum current comparison circuit, the source is connected with the resistor R22 and grounded, and the gate is connected with the resistor R21 and the resistor R22; the resistor R21 is connected with the MCU.
The working principle of the utility model comprises the following steps:
step S10, connecting a resistor R1 of the voltage difference detection circuit with a voltage sampling point of the linear power supply to obtain an output voltage value FB _ VOUT; connecting a resistor R16 of the start-control current comparison circuit and a resistor R10 of the maximum current comparison circuit with a current sampling point of the linear power supply to obtain an output current value FB _ IOUT; the drain electrode of the MOS tube Q1 of the enabling circuit is connected with the control end of the linear power supply;
step S20, the voltage difference detection circuit obtains a front end voltage value VF _ MOS of an MOS tube of the linear power supply from the MCU through a resistor R2, and calculates a voltage difference FV _ DEF between the FB _ VOUT and the VF _ MOS to be input into the voltage difference comparison circuit;
step S30, the voltage difference comparison circuit judges whether the FV _ DEF is larger than a protection voltage difference control value VPRO _ SET SET by the MCU, if so, a high-level signal CONB is output to a pin 3 of an optocoupler U4 of the enabling circuit; if not, outputting a low-level signal CONB to a pin 3 of an optocoupler U4 of the enabling circuit;
step S40, the start control current comparison circuit judges whether the FB _ IOUT is larger than the start control current control value IPRO _ SET _ MIN SET by the MCU, if yes, a high level signal CONA is output to a resistor R11 of the enabling circuit; if not, outputting a low-level signal CONA to a resistor R11 of the enabling circuit;
step S50, the maximum current comparison circuit judges whether the FB _ IOUT is larger than the maximum current control value IPRO _ SET _ MAX SET by the MCU, if yes, a high level signal CONBB is output to the resistor R13 of the enabling circuit; if not, a low-level signal CONBB is output to the resistor R13 of the enabling circuit;
step S60, when the signal CONB and the signal CONA are both at a high level or the signal CONBB is at a high level, enabling the drain of the MOS tube Q1 to output a low-level signal PRO _ AB, further turning off the output of the linear power supply, and entering a self-locking protection state;
when the signal CONB and the signal CONA are both at a high level, FV _ DEF is larger than VPRO _ SET, FB _ IOUT is larger than IPRO _ SET _ MIN, an overvoltage difference overcurrent protection mode is started, and the MOS tube Q1 is driven to output a low level to turn off the output of the linear power supply; when FV _ DEF is smaller than VPRO _ SET but FB _ IOUT is larger than IPRO _ SET _ MAX, starting the protection mode of outputting the maximum current, and driving the MOS tube Q1 to output the output of the low-level turn-off linear power supply;
step S70, after troubleshooting, enabling the drain electrode of the MOS tube Q1 to output a high-level signal PRO _ AB through a reset circuit by the MCU, and further recovering the output of the linear power supply;
when the voltage difference overcurrent protection mode is adopted, the MCU controls the start-control current comparison circuit to output a low level through the MOS tube Q2, and further enables the drain electrode of the MOS tube Q1 to output a high-level signal PRO _ AB; when the maximum current protection mode is adopted, the MCU controls the maximum current comparison circuit to output a low level through the MOS tube Q3, and further enables the drain of the MOS tube Q1 to output a high-level signal PRO _ AB.
In summary, the utility model has the advantages that:
by arranging a differential pressure detection circuit and a differential pressure comparison circuit, the differential pressure detection circuit outputs a voltage difference FV _ DEF to the differential pressure comparison circuit, and the differential pressure comparison circuit outputs a signal CONB to an enabling circuit by comparing the voltage difference FV _ DEF with a protection differential pressure control value VPRO _ SET SET by the MCU; comparing the output current value FB _ IOUT with a start control current control value IPRO _ SET _ MIN SET by the MCU by a start control current comparison circuit to output a signal CONA to an enabling circuit; comparing the output current value FB _ IOUT with the maximum current control value IPRO _ SET _ MAX SET by the MCU by setting a maximum current comparison circuit to output a signal CONBB to an enabling circuit; when the signal CONB and the signal CONA are both at a high level, a pin 4 of the optocoupler U4 can be driven to output a high level, and then the drain of the MOS transistor Q1 of the enabling circuit is driven to output a low-level signal PRO _ AB to turn off the output of the linear power supply; when the signal CONB is at a low level and cannot drive the pin 4 of the optocoupler U4 to output a high level, as long as the signal CONBB is at a high level, the drain of the MOS transistor Q1 of the drivable enabling circuit outputs a signal PRO _ AB at a low level to turn off the output of the linear power supply; and protection pressure difference control value VPRO _ SET, start accuse current control value IPRO _ SET _ MIN, maximum current control value IPRO _ SET _ MAX all can be SET up as required by MCU, realize controlling voltage difference and electric current simultaneously promptly, the value of the voltage difference of control and electric current can SET up as required, just the output of turn-off linear power supply is exceeded the control value to voltage difference or electric current, get into auto-lock protection state, avoid MOS pipe damage, finally realize carrying out dynamic control simultaneously to the voltage difference and the electric current of MOS pipe, very big extension the life of MOS pipe.
Although specific embodiments of the utility model have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the utility model, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the utility model, which is to be limited only by the appended claims.
Claims (7)
1. The utility model provides a MOS pipe consumption auto-lock protection circuit which characterized in that: comprises a voltage difference detection circuit, a voltage difference comparison circuit, an enable circuit, a start control current comparison circuit, a maximum current comparison circuit, a reset circuit and an MCU;
the input end of the differential pressure comparison circuit is connected with the output end of the differential pressure detection circuit, and the output end of the differential pressure comparison circuit is connected with the enabling circuit; the input ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the MCU, and the output ends of the start-control current comparison circuit and the maximum current comparison circuit are both connected with the enabling circuit; the MCU is respectively connected with the differential pressure detection circuit, the differential pressure comparison circuit and the enabling circuit; the input end of the reset circuit is connected with the MCU, and the output end of the reset circuit is connected with the start control current comparison circuit and the maximum current comparison circuit.
2. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the voltage difference detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R7, a resistor R8 and an operational amplifier U1B;
a pin 5 of the operational amplifier U1B is connected with a resistor R2 and a resistor R7, a pin 6 is connected with a resistor R1 and a resistor R3, and a pin 7 is connected with a resistor R3, a resistor R8 and a differential pressure comparison circuit; the resistor R7 and the resistor R8 are both grounded; the resistor R2 is connected with the MCU.
3. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the voltage difference comparison circuit comprises a resistor R4, a resistor R5, a resistor R5, a capacitor C1 and an operational amplifier U1A;
the pin 1 of the operational amplifier U1A is connected with the resistor R6 and the enabling circuit, the pin 2 is connected with the resistor R4, and the pin 3 is connected with the resistor R5 and the capacitor C1; the resistor R5 is connected with a differential pressure detection circuit; the resistor R4 is connected with the MCU; the resistor R6 and the capacitor C1 are both grounded.
4. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the enabling circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C2, an optical coupler U4 and a MOS tube Q1;
a pin 1 of the optocoupler U4 is connected with a resistor R11 and a resistor R12, a pin 2 is connected with a resistor R12 and grounded, a pin 3 is connected with a voltage difference comparison circuit, and a pin 4 is connected with a resistor R13 and a maximum current comparison circuit; the resistor R11 is connected with the start-control current comparison circuit; the gate of the MOS transistor Q1 is connected to the resistor R13, the resistor R14, and the capacitor C2, and the source is connected to the resistor R14 and the capacitor C2 and grounded.
5. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the start-up control current comparison circuit comprises a resistor R15, a resistor R16, a resistor R20, a resistor R24, a diode D2, a light-emitting diode LED2 and an operational amplifier U3;
pin 1 of the operational amplifier U3 is connected with the input end of the diode D2 and the input end of the light-emitting diode LED2, pin 3 is connected with the resistor R24, and pin 4 is connected with the resistor R15; the resistor R15 is connected with the MCU; one end of the resistor R20 is connected with the resistor 16, the resistor R24 and the reset circuit, and the other end of the resistor R20 is connected with the output end of the diode D2; the output end of the light emitting diode LED2 is connected with an enabling circuit.
6. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the maximum current comparison circuit comprises a resistor R9, a resistor R10, a resistor R19, a resistor R23, a diode D1, a light-emitting diode LED1 and an operational amplifier U2;
pin 1 of the operational amplifier U2 is connected with the input end of the diode D1 and the input end of the light-emitting diode LED1, pin 3 is connected with the resistor R23, and pin 4 is connected with the resistor R9; the resistor R9 is connected with the MCU; one end of the resistor R19 is connected with the resistor 10, the resistor R23 and the reset circuit, and the other end of the resistor R19 is connected with the output end of the diode D1; the output end of the light emitting diode LED1 is connected with an enabling circuit.
7. The MOS transistor power consumption self-locking protection circuit as claimed in claim 1, wherein: the reset circuit comprises a resistor R17, a resistor R18, a resistor R21, a resistor R22, a MOS transistor Q2 and a MOS transistor Q3;
the drain electrode of the MOS transistor Q2 is connected with the start-control current comparison circuit, the source electrode of the MOS transistor Q2 is connected with the resistor R18 and grounded, and the grid electrode of the MOS transistor Q2 is connected with the resistor R17 and the resistor R18; the resistor R17 is connected with the MCU;
the drain electrode of the MOS transistor Q3 is connected with the maximum current comparison circuit, the source electrode is connected with the resistor R22 and is grounded, and the grid electrode is connected with the resistor R21 and the resistor R22; the resistor R21 is connected with the MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121595870.XU CN215897700U (en) | 2021-07-14 | 2021-07-14 | MOS manages consumption auto-lock protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121595870.XU CN215897700U (en) | 2021-07-14 | 2021-07-14 | MOS manages consumption auto-lock protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897700U true CN215897700U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121595870.XU Active CN215897700U (en) | 2021-07-14 | 2021-07-14 | MOS manages consumption auto-lock protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN215897700U (en) |
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2021
- 2021-07-14 CN CN202121595870.XU patent/CN215897700U/en active Active
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