CN115793826A - Voltage protection circuit of MCU chip - Google Patents
Voltage protection circuit of MCU chip Download PDFInfo
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- CN115793826A CN115793826A CN202211381356.5A CN202211381356A CN115793826A CN 115793826 A CN115793826 A CN 115793826A CN 202211381356 A CN202211381356 A CN 202211381356A CN 115793826 A CN115793826 A CN 115793826A
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Abstract
The invention discloses a voltage protection circuit of an MCU chip, which relates to the technical field of circuit protection and comprises an input protection module, a load module and a control module, wherein the input protection module is used for controlling a power supply module to provide electric energy for the load module through a relay protection circuit; the voltage sampling and conditioning module is used for sampling voltage and amplifying and conditioning signals; the positive and negative voltage comparison module is used for judging positive and negative overvoltage; the signal transmission module is used for filtering and transmitting signals; the intelligent control module is used for receiving signals through the MCU circuit and controlling the module to work; and the isolation control module is used for isolating and driving the self-recovery protection control module to control the periodic work of the input protection module at regular time. The voltage protection circuit of the MCU chip detects the working electric energy of the load module, judges the voltage conditions of the positive half period and the negative half period of the alternating current, is received and analyzed by the MCU circuit, and controls the self-recovery protection control module to control the periodic protection work of the input protection module at regular time when the alternating current is in an overvoltage short circuit.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a voltage protection circuit of an MCU chip.
Background
Along with the development of intelligent electronic equipment technology, the requirements on the reliability and safety of electronic equipment are higher and higher, therefore, the electric energy input into the electronic equipment is generally detected, the occurrence of overvoltage and short circuit is prevented, the existing voltage protection circuit samples the electric energy in a mode of a resistance voltage division circuit, the electric energy is received by an MCU chip and is calculated and processed through an internally set threshold, the required programming quantity is larger, and when the voltage protection is carried out on alternating current electric energy, the alternating current needs to be rectified or detected through a peak circuit, the detection means is more complex, and because the MCU cannot detect the negative voltage, the accurate voltage detection cannot be carried out on the negative half cycle of the alternating current electric energy, the overvoltage and short circuit protection cannot be accurately realized, and therefore the improvement is needed.
Disclosure of Invention
The embodiment of the invention provides a voltage protection circuit of an MCU chip, which aims to solve the problems in the background technology.
According to an embodiment of the present invention, a voltage protection circuit of an MCU chip is provided, the voltage protection circuit of the MCU chip includes: the device comprises a power supply module, an input protection module, a load module, a voltage sampling conditioning module, a positive-negative voltage comparison module, a signal transmission module, an intelligent control module, an isolation control module and a self-recovery protection control module;
the power supply module is used for providing required electric energy for the circuit;
the input protection module is connected with the power supply module and used for controlling the electric energy transmission of the power supply module through a relay protection circuit;
the load module is connected with the input protection module and used for receiving the electric energy transmitted by the input protection module and providing the electric energy for a load system;
the voltage sampling and conditioning module is connected with the load module, and is used for performing voltage sampling on the electric energy input into the load module and outputting a voltage signal, and is used for detecting the voltage signal, amplifying and conditioning the voltage signal and outputting the voltage signal;
the positive and negative voltage comparison module is connected with the voltage sampling conditioning module and is used for respectively carrying out positive overvoltage judgment and negative overvoltage judgment on the signal output by the voltage sampling conditioning module through a positive comparison circuit and a negative comparison circuit and respectively outputting a first judgment signal and a second judgment signal;
the signal transmission module is connected with the positive-negative voltage comparison module, is used for filtering the first judgment signal and the second judgment signal through an RC filter circuit and transmitting the first judgment signal and the second judgment signal to the intelligent control module, and is used for outputting a protection control signal through an isolation trigger circuit;
the intelligent control module is connected with the signal transmission module, is used for receiving the first judgment signal and the second judgment signal through an MCU circuit, analyzing a voltage fault period, and is used for receiving the protection control signal and outputting a first control signal;
the isolation control module is connected with the intelligent control module and used for receiving the first control signal and outputting a negative trigger signal through an isolation driving circuit;
and the self-recovery protection control module is connected with the isolation control module and the input protection module and is used for receiving the negative trigger signal and controlling the periodic work of the relay protection circuit through the timing control circuit in a timing mode.
Compared with the prior art, the invention has the beneficial effects that: the voltage protection circuit of the MCU chip detects the working electric energy of a load module by a voltage sampling conditioning module, respectively carries out positive value overvoltage judgment and negative value overvoltage judgment on detected signals by a positive value comparison circuit and a negative value comparison circuit by a positive voltage comparison module and a negative voltage comparison module, judges the voltage conditions of a positive half period and a negative half period of alternating current, is processed by a signal transmission module and is received and analyzed by an MCU circuit, the voltage detection precision of the alternating current is improved, the MCU circuit controls an isolation control module to output a negative trigger signal when the alternating current is in an overvoltage short circuit, and controls a self-recovery protection control module to control the periodic protection work of a relay protection circuit at regular time, thereby realizing the self-recovery control of the circuit and improving the safety of the circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a voltage protection circuit of an MCU chip according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a voltage protection circuit of an MCU chip according to an embodiment of the present invention.
Fig. 3 is a connection circuit diagram of a self-recovery protection control module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In embodiment 1, referring to fig. 1, a voltage protection circuit of an MCU chip includes: the device comprises a power supply module 1, an input protection module 2, a load module 3, a voltage sampling and conditioning module 4, a positive-negative voltage comparison module 5, a signal transmission module 6, an intelligent control module 7, an isolation control module 8 and a self-recovery protection control module 9;
specifically, the power module 1 is used for providing required electric energy for a circuit;
the input protection module 2 is connected with the power supply module 1 and used for controlling the electric energy transmission of the power supply module 1 through a relay protection circuit;
the load module 3 is connected with the input protection module 2 and used for receiving the electric energy transmitted by the input protection module 2 and providing the electric energy for a load system;
the voltage sampling and conditioning module 4 is connected with the load module 3, and is used for performing voltage sampling on the electric energy input into the load module 3 and outputting a voltage signal, and is used for detecting the voltage signal, amplifying and conditioning the voltage signal and outputting the voltage signal;
the positive and negative voltage comparison module 5 is connected with the voltage sampling conditioning module 4 and is used for respectively carrying out positive overvoltage judgment and negative overvoltage judgment on the signal output by the voltage sampling conditioning module 4 through a positive comparison circuit and a negative comparison circuit and respectively outputting a first judgment signal and a second judgment signal;
the signal transmission module 6 is connected with the positive-negative voltage comparison module 5, is used for performing filtering processing on the first judgment signal and the second judgment signal through an RC filter circuit and transmitting the first judgment signal and the second judgment signal to the intelligent control module 7, and is used for outputting a protection control signal through an isolation trigger circuit;
the intelligent control module 7 is connected with the signal transmission module 6, and is used for receiving the first judgment signal and the second judgment signal through an MCU circuit, analyzing a voltage fault period, receiving the protection control signal and outputting a first control signal;
the isolation control module 8 is connected with the intelligent control module 7 and used for receiving the first control signal and outputting a negative trigger signal through an isolation driving circuit;
and the self-recovery protection control module 9 is connected with the isolation control module 8 and the input protection module 2 and is used for receiving the negative trigger signal and controlling the periodic work of the relay protection circuit in a timing manner through the timing control circuit.
In a specific embodiment, the power module 1 may adopt an ac power supply and a dc power supply for power supply processing, which is not described herein again; the input protection module 2 adopts a relay protection circuit to control the connection of the power supply module 1 and the load module 3; the load module 3 is used as an electronic component consuming electric energy, and a specific load circuit is not described herein; the voltage sampling conditioning module 4 can adopt a resistance voltage-dividing circuit and an operational amplifier circuit, the resistance voltage-dividing circuit samples voltage, and the operational amplifier circuit amplifies signals; the positive and negative voltage comparison module 5 can respectively perform positive overvoltage judgment and negative overvoltage judgment on the signal output by the voltage sampling conditioning module 4 by adopting a positive comparison circuit and a negative comparison circuit; the signal transmission module 6 may adopt an RC filter circuit to filter the input signal, and also adopt an isolation trigger circuit to provide a protection control instruction for the intelligent control module 7; the intelligent control module 7 can adopt an MCU circuit to realize the signal receiving and the module control, which is not described herein again; the isolation control module 8 can adopt an isolation driving circuit to output a negative trigger signal; the self-recovery protection control module 9 may use a timing control circuit to control the periodic work of the relay protection circuit in a timing manner.
specifically, one end of the first relay switch K1-1 is connected to the power module 1, the other end of the first relay switch K1-1 is connected to the first end of the first resistor R1 and the load module 3, and the second end of the first resistor R1 is connected to the ground through the second resistor R2.
Further, the voltage sampling conditioning module 4 includes a third resistor R3, a fourth resistor R4, a first operational amplifier OP1, a fifth resistor R5, a first capacitor C1, a sixth resistor R6, and a second capacitor C2;
specifically, one end of the third resistor R3 is connected to the second end of the first resistor R1, the other end of the third resistor R3 is connected to the inverting terminal of the first operational amplifier OP1 and one end of the fifth resistor R5, and is connected to the output terminal of the first operational amplifier OP1, the other end of the fifth resistor R5 and the first end of the sixth resistor R6 through the first capacitor C1, the in-phase terminal of the first operational amplifier OP1 is connected to the ground through the fourth resistor R4, and the second end of the sixth resistor R6 is connected to the positive/negative voltage comparing module 5 and is connected to the ground through the second capacitor C2.
In a specific embodiment, the first relay switch K1-1 may be a normally closed switch; the first resistor R1 and the second resistor R2 form a resistor voltage division circuit for voltage sampling; the first operational amplifier OP1 can use an OP07 operational amplifier to perform turnover amplification processing on the positive half cycle and the negative half cycle of the alternating current energy; the sixth resistor R6 and the second capacitor C2 form an RC filter circuit.
Further, the positive-negative voltage comparing module 5 includes a seventh resistor R7, a first comparator A1, a positive voltage threshold, a ninth resistor R9, and a sixth power VCC6;
specifically, a first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, a second end of the seventh resistor R7 is connected to a non-inverting end of the first comparator A1, an inverting end of the first comparator A1 is connected to the positive voltage threshold, and an output end of the first comparator A1 is connected to the signal transmission module 6 and is connected to the sixth power VCC6 through the ninth resistor R9.
In a specific embodiment, the first comparator A1 may be an LM393 comparator, and the positive voltage threshold is matched to perform the negative half-cycle overvoltage judgment on the positive voltage output by the first operational amplifier OP 1.
Further, the positive-negative voltage comparison module 5 further includes an eighth resistor R8, a first voltage regulator VD1, a second voltage regulator VD2, and a tenth resistor R10;
specifically, one end of the eighth resistor R8 is connected to the first end of the seventh resistor R7, the other end of the eighth resistor R8 is connected to the anode of the first voltage regulator VD1, the cathode of the first voltage regulator VD1 is connected to the cathode of the second voltage regulator VD2, the anode of the second voltage regulator VD2 is connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is connected to the signal transmission module 6.
In a specific embodiment, the first voltage regulator VD1 and the second voltage regulator VD2 are used as negative voltage overvoltage judgment thresholds, and positive half-cycle overvoltage judgment of the alternating current energy is performed on the negative voltage output by the first operational amplifier OP 1.
Further, the signal transmission module 6 includes a third capacitor C3, an eleventh resistor R11, a tenth capacitor C10, and a fifteenth resistor R15; the intelligent control module 7 comprises a first controller U1;
specifically, one end of the third capacitor C3 is connected to the output end of the first comparator A1 and is connected to the second IO end of the first controller U1 through an eleventh resistor R11, the other end of the third capacitor C3 is grounded, one end of the fourth capacitor is connected to the second end of the tenth resistor R10 and is connected to the third IO end of the first controller U1 through a fifteenth resistor R15, and the other end of the third capacitor C3 and the other end of the fourth capacitor are both grounded.
In a specific embodiment, the third capacitor C3, the eleventh resistor R11, the fourth capacitor and the fifteenth resistor R15 form an RC filter circuit, and perform filtering processing on an input signal; the first controller U1 can be an MCU chip, and the specific model is not limited.
Further, the signal transmission module 6 further includes a first switch tube VT1, a twelfth resistor R12, a first power source VCC1, a first diode D1, a first optocoupler J1, a thirteenth resistor R13, a second diode D2, a second switch tube VT2, a fourteenth resistor R14, a second power source VCC2, a sixteenth resistor R16, a seventeenth resistor R17, a third switch tube VT3, and a third power source VCC3;
specifically, the base of the first switching tube VT1 and the base of the second switching tube VT2 are respectively connected to the output end of the first comparator A1 and the second end of the tenth resistor R10, the collector of the first switching tube VT1 is connected to the first power source VCC1 through the twelfth resistor R12, the emitter of the first switching tube VT1 is connected to the cathode of the first diode D1 and the first end of the first optocoupler J1, the emitter of the second switching tube VT2 is connected to the anode of the second diode D2 and the second end of the first optocoupler J1 through the thirteenth resistor R13, the third end of the first optocoupler J1 is connected to the base of the third switching tube VT3 and the one end of the seventeenth resistor VT 17 and the third power source VCC3 through the sixteenth resistor R16, the other end of the seventeenth resistor R17 is connected to the collector of the third switching tube VT3 and the first IO end of the first controller U1, the emitter of the third optocoupler VT3 and the first switching tube J1 are both grounded, the anode of the first diode D1 and the collector of the second diode D2 are both grounded, and the cathode of the collector of the second diode VT2 are both grounded through the first optocoupler diode VT 2.
In a specific embodiment, the first switch tube VT1 may be an NPN-type triode, and the second switch tube VT2 may be a PNP-type triode, and is configured to trigger the first optocoupler J1 to transmit a signal; the first optical coupler J1 can be a PC817 photoelectric coupler; the third switching tube VT3 may be an NPN type transistor, and is controlled by the first optocoupler J1 to provide a protection control signal for the first controller U1.
Further, the isolation control module 8 includes a second optocoupler J2, an eighteenth resistor R18, a fourth power supply VCC4, a twentieth resistor R20, a nineteenth resistor R19, a fifth capacitor C5, a fourth switching tube VT4, a twenty-first resistor R21, an eighth capacitor C8, and a fifth power supply VCC5;
specifically, fourth power VCC4 connects the first end of second opto-coupler J2 through eighteenth resistance R18, and the second end of second opto-coupler J2 is connected the fourth IO end of first controller U1, and fifth power VCC5, nineteenth resistance R19's one end and the first end of twenty-first resistance R21 are connected to first opto-coupler J1's third end, and nineteenth resistance R19's the other end and the fourth switch tube VT 4's collecting electrode are connected through eighth electric capacity C8 to twentieth resistance R20's second end, and fourth optical coupler J2's fourth end and fifth electric capacity C5's one end and the other end of connecting fifth electric capacity C5 through twentieth resistance R20, fourth switch tube VT 4's projecting pole and ground terminal are connected to the base of fourth switch tube VT 4.
In a specific embodiment, the second optocoupler J2 may be a PC817 optocoupler, transmit a control signal output by the first controller U1, and control a working state of the fourth switching tube VT 4; the fourth switching tube VT4 may be an NPN-type triode, and outputs a negative trigger signal in cooperation with the nineteenth resistor R19, the twenty-first resistor R21, and the fifth resistor R5.
Further, the self-recovery protection control module 9 includes a twenty-second resistor R22, a sixth capacitor C6, a timer U2, and a seventh capacitor C7;
specifically, one end of the twenty-second resistor R22, the fourth end and the eighth end of the timer U2 are connected to the fifth power VCC5, the second end of the timer U2 is connected to the second end of the twenty-first resistor R21, the other end of the twenty-second resistor R22 is connected to the sixth end and the seventh end of the timer U2 and is grounded through the sixth capacitor C6, the fifth end of the timer U2 is connected to the first end and the ground end of the timer U2 through the seventh capacitor C7, and the third end of the timer U2 is connected to the input protection module 2.
In a specific embodiment, the timer U2 may be implemented by an NE555 integrated circuit.
Further, the input protection module 2 further includes a twenty-third resistor R23, a twenty-fourth resistor R24, a fifth switching tube VT5, a first relay K1, and a third diode D3;
specifically, one end of the twenty-third resistor R23 is connected to the third end of the timer U2, the other end of the twenty-third resistor R23 is connected to the base of the fifth switching tube VT5 and is connected to the emitter and the ground of the fifth switching tube VT5 through the twenty-fourth resistor R24, the collector of the fifth switching tube VT5 is connected to the anode of the third diode D3 and one end of the first relay K1, and the other end of the first relay K1 and the cathode of the third diode D3 are connected to the eighth end of the timer U2.
In a specific embodiment, the fifth switching tube VT5 may be an NPN transistor, and is configured to control an operating state of the first relay K1; the first relay K1 is used for controlling the on-off state of the first relay switch K1-1.
The invention relates to a voltage protection circuit of an MCU chip, which is characterized in that a power module 1 provides alternating current or direct current, when alternating current is input, electric energy is transmitted to a load module 3 through a first relay switch K1-1, a first resistor R1 and a second resistor R2 are used for sampling, a first operational amplifier OP1 is used for carrying out reversal amplification processing, when a positive half cycle of the alternating current is detected, the first operational amplifier OP1 outputs negative voltage, when a negative half cycle is detected, the first operational amplifier OP1 outputs positive voltage, the output negative voltage carries out positive half cycle overvoltage judgment through a first voltage regulator tube VD1 and a second voltage regulator tube VD2, the output positive voltage carries out negative half cycle overvoltage judgment through a first comparator A1, when the first operational amplifier OP1 outputs high level, the negative half cycle overvoltage of the alternating current triggers a first switch tube VT1 to be conducted, a signal output by the first operational amplifier OP1 is transmitted to a second half cycle of a first controller U1 through an eleventh resistor R11 and a third capacitor C3 to carry out negative overvoltage recording IO, the first optical coupler J1 is conducted to control the third switching tube VT3 to be cut off, the first IO end of the first controller U1 receives a protection control signal, when the first voltage regulator tube VD1 is broken down and the second voltage regulator tube VD2 is conducted, the positive half-cycle overvoltage is generated, the second switching tube VT2 is triggered to be conducted by negative pressure, the positive half-cycle overvoltage recording is carried out by the third IO end of the first controller U1 in the same way, the conduction of the first optical coupler J1 is controlled, the first IO end of the first controller U1 receives the protection control signal, as long as the first IO end of the first controller U1 receives the protection control signal, the fourth IO end of the first controller U1 outputs the first control signal in a pulse form, the second optical coupler J2 and the fourth switching tube VT4 are processed to provide a negative trigger signal for the timer U2, the timer U2 is triggered to output a high level to control the work of the first relay K1 at regular time, and (3) switching off the first relay switch K1-1, switching off the power supply module 1, reclosing the first relay switch K1-1 after timing is finished, and detecting whether the circuit is still in fault, wherein the detection of the direct current is in a positive half period detection mode of the alternating current.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A voltage protection circuit of an MCU chip is characterized in that,
this voltage protection circuit of MCU chip includes: the device comprises a power supply module, an input protection module, a load module, a voltage sampling conditioning module, a positive-negative voltage comparison module, a signal transmission module, an intelligent control module, an isolation control module and a self-recovery protection control module;
the power supply module is used for providing required electric energy for the circuit;
the input protection module is connected with the power supply module and used for controlling the electric energy transmission of the power supply module through a relay protection circuit;
the load module is connected with the input protection module and used for receiving the electric energy transmitted by the input protection module and providing the electric energy for a load system;
the voltage sampling and conditioning module is connected with the load module, and is used for performing voltage sampling on the electric energy input into the load module and outputting a voltage signal, and is used for detecting the voltage signal, amplifying and conditioning the voltage signal and outputting the voltage signal;
the positive and negative voltage comparison module is connected with the voltage sampling conditioning module and is used for respectively carrying out positive overvoltage judgment and negative overvoltage judgment on the signal output by the voltage sampling conditioning module through a positive comparison circuit and a negative comparison circuit and respectively outputting a first judgment signal and a second judgment signal;
the signal transmission module is connected with the positive-negative voltage comparison module, is used for filtering the first judgment signal and the second judgment signal through an RC filter circuit and transmitting the first judgment signal and the second judgment signal to the intelligent control module, and is used for outputting a protection control signal through an isolation trigger circuit;
the intelligent control module is connected with the signal transmission module, is used for receiving the first judgment signal and the second judgment signal through an MCU circuit, analyzing a voltage fault period, and is used for receiving the protection control signal and outputting a first control signal;
the isolation control module is connected with the intelligent control module and used for receiving the first control signal and outputting a negative trigger signal through an isolation driving circuit;
and the self-recovery protection control module is connected with the isolation control module and the input protection module and is used for receiving the negative trigger signal and controlling the periodic work of the relay protection circuit through the timing control circuit in a timing mode.
2. The voltage protection circuit of the MCU chip according to claim 1, wherein the input protection module comprises a first relay switch; the voltage sampling conditioning module comprises a first resistor and a second resistor;
one end of the first relay switch is connected with the power module, the other end of the first relay switch is connected with the first end of the first resistor and the load module, and the second end of the first resistor is connected with the ground end through the second resistor.
3. The voltage protection circuit of the MCU chip according to claim 2, wherein the voltage sampling conditioning module comprises a third resistor, a fourth resistor, a first operational amplifier, a fifth resistor, a first capacitor, a sixth resistor and a second capacitor;
one end of the third resistor is connected with the second end of the first resistor, the other end of the third resistor is connected with the inverting end of the first operational amplifier and one end of the fifth resistor, the other end of the first operational amplifier, the other end of the fifth resistor and the first end of the sixth resistor are connected through the first capacitor, the inverting end of the first operational amplifier is connected with the ground end through the fourth resistor, and the second end of the sixth resistor is connected with the positive and negative voltage comparison module and the ground end through the second capacitor.
4. The voltage protection circuit of the MCU chip according to claim 3, wherein the positive-negative voltage comparison module comprises a seventh resistor, a first comparator, a positive voltage threshold, a ninth resistor, and a sixth power supply;
the first end of the seventh resistor is connected with the second end of the sixth resistor, the second end of the seventh resistor is connected with the in-phase end of the first comparator, the inverting end of the first comparator is connected with the positive voltage threshold, and the output end of the first comparator is connected with the signal transmission module and is connected with the sixth power supply through the ninth resistor.
5. The voltage protection circuit of the MCU chip according to claim 4, wherein the positive-negative voltage comparison module further comprises an eighth resistor, a first voltage regulator tube, a second voltage regulator tube and a tenth resistor;
one end of the eighth resistor is connected with the first end of the seventh resistor, the other end of the eighth resistor is connected with the anode of the first voltage-stabilizing tube, the cathode of the first voltage-stabilizing tube is connected with the cathode of the second voltage-stabilizing tube, the anode of the second voltage-stabilizing tube is connected with the first end of the tenth resistor, and the second end of the tenth resistor is connected with the signal transmission module.
6. The voltage protection circuit of the MCU chip of claim 5, wherein the signal transmission module comprises a third capacitor, an eleventh resistor, a tenth capacitor, a fifteenth resistor; the intelligent control module comprises a first controller;
one end of the third capacitor is connected with the output end of the first comparator and is connected with the second IO end of the first controller through an eleventh resistor, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected with the second end of the tenth resistor and is connected with the third IO end of the first controller through a fifteenth resistor, and the other end of the third capacitor and the other end of the fourth capacitor are both grounded.
7. The voltage protection circuit of the MCU chip of claim 6, wherein the signal transmission module further comprises a first switch tube, a twelfth resistor, a first power supply, a first diode, a first optocoupler, a thirteenth resistor, a second diode, a second switch tube, a fourteenth resistor, a second power supply, a sixteenth resistor, a seventeenth resistor, a third switch tube, and a third power supply;
the base of the first switch tube and the base of the second switch tube are respectively connected with the output end of the first comparator and the second end of the tenth resistor, the collector of the first switch tube is connected with the first power supply through the twelfth resistor, the emitter of the first switch tube is connected with the cathode of the first diode and the first end of the first optocoupler, the emitter of the second switch tube is connected with the anode of the second diode and is connected with the second end of the first optocoupler through the thirteenth resistor, the third end of the first optocoupler is connected with the base of the third switch tube and is connected with one end of the seventeenth resistor and the third power supply through the sixteenth resistor, the other end of the seventeenth resistor is connected with the collector of the third switch tube and the first IO end of the first controller, the emitter of the third switch tube and the fourth end of the first optocoupler are both grounded, the anode of the first diode and the cathode of the second diode are both grounded, and the collector of the second switch tube is connected with the second power supply through the fourteenth resistor.
8. The voltage protection circuit of the MCU chip of claim 6, wherein the isolation control module comprises a second optocoupler, an eighteenth resistor, a fourth power supply, a twentieth resistor, a nineteenth resistor, a fifth capacitor, a fourth switching tube, a twenty-first resistor, an eighth capacitor and a fifth power supply;
the fourth power passes through the first end of eighteenth resistance connection second opto-coupler, and the second end of second opto-coupler is connected the fourth IO end of first controller, the fifth power is connected to the third end of first opto-coupler, the one end of nineteenth resistance and the first end of twenty-first resistance, the other end of nineteenth resistance and the collecting electrode of fourth switch pipe are connected through eighth electric capacity to the second end of twentieth resistance, the fourth end of second opto-coupler and the one end of fifth electric capacity are connected to the base of fourth switch pipe and the other end of fifth electric capacity, the projecting pole and the ground terminal of fourth switch pipe are connected through twentieth resistance.
9. The voltage protection circuit of the MCU chip of claim 8, wherein the self-recovery protection control module comprises a twenty-second resistor, a sixth capacitor, a timer and a seventh capacitor;
one end of the twenty-second resistor, the fourth end and the eighth end of the timer are connected with the fifth power supply, the second end of the timer is connected with the second end of the twenty-first resistor, the other end of the twenty-second resistor is connected with the sixth end and the seventh end of the timer and is grounded through the sixth capacitor, the fifth end of the timer is connected with the first end and the ground end of the timer through the seventh capacitor, and the third end of the timer is connected with the input protection module.
10. The voltage protection circuit of the MCU chip of claim 9, wherein the input protection module further comprises a twenty-third resistor, a twenty-fourth resistor, a fifth switch tube, a first relay, a third diode;
one end of the twenty-third resistor is connected with the third end of the timer, the other end of the twenty-third resistor is connected with the base electrode of the fifth switching tube and is connected with the emitting electrode and the ground end of the fifth switching tube through the twenty-fourth resistor, the collector electrode of the fifth switching tube is connected with the anode of the third diode and one end of the first relay, and the other end of the first relay and the cathode of the third diode are connected with the eighth end of the timer.
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| CN202211381356.5A CN115793826A (en) | 2022-11-07 | 2022-11-07 | Voltage protection circuit of MCU chip |
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| CN202211381356.5A CN115793826A (en) | 2022-11-07 | 2022-11-07 | Voltage protection circuit of MCU chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117032433A (en) * | 2023-10-09 | 2023-11-10 | 深圳市七彩虹禹贡科技发展有限公司 | Intelligent control circuit for main board power supply |
-
2022
- 2022-11-07 CN CN202211381356.5A patent/CN115793826A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117032433A (en) * | 2023-10-09 | 2023-11-10 | 深圳市七彩虹禹贡科技发展有限公司 | Intelligent control circuit for main board power supply |
| CN117032433B (en) * | 2023-10-09 | 2024-02-13 | 深圳市七彩虹禹贡科技发展有限公司 | Intelligent control circuit for main board power supply |
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