CN115395636A - Redundant backup constant-current-to-constant-voltage power supply circuit and control method - Google Patents

Redundant backup constant-current-to-constant-voltage power supply circuit and control method Download PDF

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CN115395636A
CN115395636A CN202210942143.9A CN202210942143A CN115395636A CN 115395636 A CN115395636 A CN 115395636A CN 202210942143 A CN202210942143 A CN 202210942143A CN 115395636 A CN115395636 A CN 115395636A
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switch
module
voltage
current
constant
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CN115395636B (en
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白杨
孙希延
胡肖松
纪元法
梁维彬
付文涛
段筱雨
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention relates to the technical field of constant current to constant voltage power supply circuits, in particular to a redundant backup constant current to constant voltage power supply circuit and a control method thereof, wherein the redundant backup constant current to constant voltage power supply circuit comprises a main module, a slave module, a control module, a first switch, a second switch and a third switch, wherein the control module receives a current state signal and a voltage state signal of the main module and a current state signal and a voltage state signal of the slave module to obtain a receiving signal, and controls the on-off state of the first switch, the second switch and the third switch based on the receiving signal; the first switch, the second switch and the third switch control the working states of the master module and the slave module through different on-off states; the master module and the slave module realize the conversion from constant current to constant voltage when in operation; the control module controls the on-off of the three switches to control the main module and the slave module to work independently or simultaneously, so that the problem of low reliability of the constant-current-to-constant-voltage power supply circuit is solved.

Description

Redundant backup constant-current-to-constant-voltage power supply circuit and control method
Technical Field
The invention relates to the technical field of constant-current to constant-voltage power supply circuits, in particular to a redundant backup constant-current to constant-voltage power supply circuit and a control method.
Background
The constant current to constant voltage power supply circuit is a power conversion circuit which converts a constant current into a constant voltage and outputs the constant voltage. In some remote power supply systems and remote power distribution systems, the constant-current to constant-voltage circuit can realize single-wire current signal input and double-wire constant-voltage output, and output voltage is supplied to electric equipment working in a voltage mode to work.
The constant-current to constant-voltage power supply circuit plays an important role in some application occasions. For example, in a submarine optical cable system power supply and distribution network in an ocean information network, because the transmission distance of a submarine cable is hundreds of kilometers, even thousands of kilometers, the submarine cable generally adopts remote constant current power supply for improving the reliability of the system, and at this time, power utilization equipment in the submarine cable is generally called a constant current power-taking module. The constant current power taking module mainly realizes the function of converting constant current into constant voltage, the output power of the constant current power taking module ranges from several watts to up to kilowatt, and the maintenance cost of the submarine optical cable is very high, so that the constant current power taking module is required to have extremely high reliability. Another application is remote monitoring equipment in remote areas, for example, in remote mountain top monitoring camera power distribution systems, in underwater monitoring systems of ponds or reservoirs, because the transmission distance is long, the constant-voltage power supply is adopted, and the electric equipment is often abnormal because of overlarge voltage drop of cables, so that higher cable cost is needed, while the constant-current power supply is adopted, so that the common cables are adopted, and the power-taking equipment adopts constant-current power taking, so that the cost of the system can be greatly reduced. The application systems have higher requirements on the reliability of the constant-current to constant-voltage circuit, but the prior art cannot improve the reliability of the constant-current to constant-voltage circuit, so that the reliability of electric equipment is reduced.
Disclosure of Invention
The invention aims to provide a redundant backup constant-current to constant-voltage power supply circuit and a control method, and aims to solve the problem of low reliability of the constant-current to constant-voltage power supply circuit.
In order to achieve the above object, in a first aspect, the present invention provides a redundant backup constant current to constant voltage power supply circuit, including a master module, a slave module, a control module, a first switch, a second switch and a third switch;
the constant current input terminal is connected with the current input anode of the master module, the current input cathode of the master module is connected with the current input anode of the slave module, and the current input cathode of the slave module is connected with the constant current output terminal; the intermediate terminal of the control module is connected with the current input negative electrode of the master module and the current input terminal positive electrode of the slave module, the input terminal of the control module is connected with the current input positive electrode of the master module, and the output terminal of the control module is connected with the current input negative electrode of the slave module; the voltage output positive pole of the master module is connected with the voltage output positive pole of the slave module, the voltage output negative pole of the master module is connected with the voltage output negative pole of the slave module, and the first switch, the second switch and the third switch are all connected between the middle terminal and the input terminal of the control module;
the control module is used for receiving the current state signal and the voltage state signal of the master module and the current state signal and the voltage state signal of the slave module to obtain a receiving signal, and controlling the on-off states of the first switch, the second switch and the third switch based on the receiving signal;
the first switch, the second switch and the third switch are used for controlling the working states of the master module and the slave module through different on-off states;
the main module is used for realizing conversion from constant current to constant voltage during operation;
the slave module is used for realizing conversion from constant current to constant voltage during operation.
The control module comprises a voltage stabilizing circuit, a linear power supply circuit, a micro MCU circuit and a switch circuit, wherein the voltage stabilizing circuit, the linear power supply circuit, the micro MCU circuit and the switch circuit are sequentially connected;
the voltage stabilizing circuit is used for shunting input total current, then clamping voltage, and transmitting the clamped voltage to the linear power supply circuit;
the linear power supply circuit is used for carrying out voltage conversion on the clamped voltage to obtain a stable voltage and transmitting the stable voltage to the micro MCU circuit;
the micro MCU circuit is used for receiving the current state signal and the voltage state signal of the master module and the current state signal and the voltage state signal of the slave module to obtain a receiving signal, outputting a first control signal, a second control signal and a third control signal based on the receiving signal, and transmitting the stable voltage to the switch circuit;
the switch circuit controls the on-off states of the first switch, the second switch and the third switch based on the first control signal, the second control signal and the third control signal.
The switch circuit comprises a circuit formed by three isolating relays or a circuit formed by three isolating optocouplers.
Wherein when the first control signal, the second control signal, and the third control signal are off, on, and off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an off state, an on state and an off state respectively, at the moment, the main module works independently, the shunted current enters an input electrode of the main module, and the stable voltage is output from an output terminal of the main module.
Wherein when the first control signal, the second control signal, and the third control are turned on, off, and off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an on state, an off state and an off state respectively, at the moment, the slave module works independently, the shunted current enters an input pole of the slave module, and the stable voltage is output from an output terminal of the slave module.
Wherein when the first control signal, the second control signal, and the third control are turned off, and turned off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in a disconnected state, a disconnected state and a disconnected state respectively, at the moment, the master module and the slave module work simultaneously, the shunted current enters an input pole of the master module and then enters an input pole of the slave module, and the stable voltage is output from output terminals of the master module and the slave module simultaneously and is connected in parallel at an output end.
Wherein when the first control signal, the second control signal, and the third control are turned off, and on, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an off state, an off state and an on state respectively, and at the moment, the master module and the slave module are all withdrawn from operation.
In a second aspect, the invention provides a control method for a redundant backup constant-current to constant-voltage power supply circuit, which comprises the following steps:
the first switch, the second switch and the third switch are controlled to be switched off through the switch circuit, so that the master module and the slave module are connected to the system to work;
the micro MCU circuit acquires a current state signal of the master module and a current state signal of the slave module, and simultaneously acquires a voltage state signal of the master module and a voltage state signal of the slave module to obtain a receiving signal;
and judging the fault condition of the master module or the slave module according to the received signal, and controlling the on-off conditions of the first switch, the second switch and the third switch through a switch circuit based on the fault condition.
The specific way of judging the fault condition of the master module or the slave module according to the received signal and controlling the on-off conditions of the first switch, the second switch and the third switch through the switch circuit based on the fault condition is as follows:
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 1, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 1, the master module and the slave module have no fault, and the first switch, the second switch and the third switch are controlled to be switched off through the switch circuit;
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 0, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 1, the master module fails, the slave module works normally, and the first switch, the second switch and the third switch are controlled to be closed, opened and closed through the switch circuit;
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 1, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 0, the master module is normal, the slave module fails, the system enters an independent master module working mode, and the first switch is controlled to be switched off, the second switch is controlled to be switched on and the third switch is controlled to be switched off by the switch circuit;
the micro MCU circuit obtains current state signals and voltage state signals of the master module and the slave module, if the current state signals of the master module are 1, the current state signals of the slave module are 0, the voltage state signals of the master module are 1 and the voltage state signals of the slave module are 0, the master module and the slave module both have faults, and the first switch, the second switch and the third switch are controlled to be opened and closed through the switch circuit.
According to the redundant backup constant-current-to-constant-voltage power supply circuit, the control module receives the current state signal and the voltage state signal of the main module and the current state signal and the voltage state signal of the slave module to obtain receiving signals, and the on-off states of the first switch, the second switch and the third switch are controlled based on the receiving signals; the first switch, the second switch and the third switch control the working states of the master module and the slave module through different on-off states; the main module realizes the conversion from constant current to constant voltage when in work; the slave module realizes the conversion from constant current to constant voltage when in work, and the control module controls the on-off of the first switch, the second switch and the third switch to control the independent work or the simultaneous work of the master module and the slave module so as to increase the reliability of the circuit and solve the problem of lower reliability of the constant current to constant voltage power supply circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a redundant backup constant-current to constant-voltage power supply provided by the invention.
Fig. 2 is a schematic diagram of the operation of the main module.
Fig. 3 is a working schematic diagram of the slave module.
FIG. 4 is a schematic diagram of the simultaneous operation of a master module and a slave module.
FIG. 5 is a schematic diagram of the master and slave modules both being taken out of service.
FIG. 6 is a control module schematic.
FIG. 7 is another implementation schematic of a control module.
Fig. 8 is a flowchart of a redundant backup constant-current to constant-voltage power circuit control method provided by the present invention.
Fig. 9 is a schematic diagram of a control method of a redundant backup constant current to constant voltage power supply circuit according to the present invention.
11-main module, 12-slave module, 13-control module, 131-voltage stabilizing circuit, 132-linear power supply circuit, 133-micro MCU circuit and 134-switch circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 to 7, in a first aspect:
example 1:
the invention provides a redundant backup constant-current-to-constant-voltage power supply circuit, which comprises a main module 11, a slave module 12, a control module 13, a first switch S1, a second switch S2 and a third switch S3, wherein the main module is connected with the slave module through a first switch S2;
the constant current input terminal CC + is connected to the current input positive electrode N1 of the master module 11, the current input negative electrode N2 of the master module 11 is connected to the current input positive electrode N3 of the slave module 12, and the current input negative electrode N4 of the slave module 12 is connected to the constant current output terminal CC-. The intermediate terminal a of the control module 13 is connected to the current input negative electrode N2 of the master module 11 and the current input terminal positive electrode N3 of the slave module 12, the input terminal B of the control module 13 is connected to the current input positive electrode N1 of the master module 11, and the output terminal C of the control module 13 is connected to the current input negative electrode N4 of the slave module 12; a voltage output positive electrode O1 of the master module 11 is connected to a voltage output positive electrode O3 of the slave module 12, a voltage output negative electrode O2 of the master module 11 is connected to a voltage output negative electrode O4 of the slave module 12, and the first switch S1, the second switch S2, and the third switch S3 are all connected between an intermediate terminal and an input terminal of the control module 13;
the control module 13 is configured to receive a current state signal and a voltage state signal of the master module 11 and a current state signal and a voltage state signal of the slave module 12 to obtain a received signal, and control on/off states of the first switch S1, the second switch S2, and the third switch S3 based on the received signal;
the first switch S1, the second switch S2 and the third switch S3 are configured to control the working states of the master module 11 and the slave module 12 through different on-off states;
the main module 11 is configured to implement conversion from a Constant Current (CC) to a Constant Voltage (CV) during operation;
the slave module 12 is configured to, when in operation, implement a Constant Current (CV) to Constant Voltage (CV).
The master module 11 and the slave module 12 function to realize conversion of a Constant Current (CC) to a Constant Voltage (CV); constant current flows between a current input anode N1 and a current input cathode N2 of the main module 11, the current can be in a forward direction or a reverse direction, constant voltage is output between a voltage output anode O1 and a voltage output cathode O2, and the voltage direction is fixed; constant current flows between the current input anode N3 and the current input cathode N3 of the module 12, the current can be in a forward direction or a reverse direction, constant voltage is output between the voltage output anode O3 and the voltage output cathode O4, and the voltage direction is fixed.
The core circuits of the master module 11 and the slave module 12 of the redundant backup constant-current to constant-voltage power supply circuit are CC to CV circuits, and the CC to CV circuits are called constant-current (CC) to constant-voltage (CV) circuits. The main function of the CC-to-CV circuit is to convert an input constant current signal into a constant voltage signal for output, where the input constant current signal is, of course, a direct current rather than an alternating current, but the direct current has a certain range, and even some direct currents support wide-range input, such as input of a constant current of 1.5A (ampere times), but the direct current range supports 0.5A to 2.0A. The output of the CC-to-CV circuit is a constant voltage signal, which means that the output voltage is a constant voltage, and when the output load changes, the output voltage is basically constant, but the output voltage of the actual product slightly changes with the change of the output power due to the load modulation effect, but the change still falls within the allowable range of the operation of the product, for example, the output voltage is 12V, but when the load changes from 0W (watt) to 30W, the change range of the output voltage is 11.5V to 13V, and the change range is allowable.
Specifically, the main function of the redundant backup constant-current to constant-voltage conversion circuit is to realize the control and current conversion functions of several working states of two modules (a main module and a slave module) with constant current input, and the detailed modes are as follows: master-only module operation, slave-only module 12 operation, master-slave backup operation, and exit operation.
The single master module operation mode, in which the control module 13 is connected to P1-P3, short-circuits the input current of the slave module 12, that is, the terminal N3 and the terminal N4 of the slave module 12 are short-circuited, and the operation current flow direction in the redundant backup constant current to constant voltage circuit is as follows: terminal CC +, terminal N1 of main module 11, terminal N2 of main module 11, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the output positive terminal O1 of the master module 11 and the output positive terminal O3 of the slave module 12 are connected and used as the output positive electrode CV + of the redundant backup constant current to constant voltage circuit, and the output negative terminal O2 of the master module 11 and the output negative terminal O4 of the slave module 12 are connected and used as the output negative electrode CV-. When the master module is in operation, only the master module 11 is in operation and converts the input constant current into a constant voltage output, and the slave module 12 does not operate and has no voltage output.
The independent slave module operating mode, in which the control module 13 is connected to P1-P2 to short-circuit the input current of the master module 11, that is, the terminal N1 and the terminal N2 of the master module 11 are short-circuited, and the operating current flow in the redundant backup constant-current to constant-voltage circuit is as follows: terminal CC +, terminal P2 of control module 13, terminal P1 of control module 13, terminal N3 of slave module 12, terminal N4 of slave module 12, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the slave module is operated, only the slave module 12 is operated and converts the input constant current into the constant voltage output, and the master module 11 is not operated and has no voltage output.
In the master-slave module backup working mode, at this time, the terminals P1, P2, and P3 of the control module are not connected, the master module 11 and the slave module 12 are both in a working state, and at this time, the working current flow direction in the redundant backup constant-current-to-constant-voltage circuit is as follows: terminal CC +, terminal N1 of master module 11, terminal N2 of master module 11, terminal N3 of slave module 12, terminal N4 of slave module 12, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the output positive terminal O1 of the master module 11 and the output positive terminal O3 of the slave module 12 are connected and used as the output positive electrode CV + of the redundant backup constant current to constant voltage circuit, and the output negative terminal O2 of the master module 11 and the output negative terminal O4 of the slave module 12 are connected and used as the output negative electrode CV-. When the master module and the slave module work in a backup mode, the master module 11 and the slave module 12 are both in a working state, input constant current is converted into constant voltage output, and the constant voltage output is connected in parallel at the output end.
Furthermore, in some designs, when the master module and the slave module work in a backup mode, the master module 11 and the slave module 12 may be designed to be in a current sharing working state when output in parallel, and at this time, a single or multiple communication control lines are provided between the master module 11 and the slave module 12, so that output power of the two modules is approximately equal when the two modules work simultaneously.
Exiting the working mode, at this time, the terminal P2 and the terminal P3 of the control module 13 are connected, the current does not flow through the master module 11 and the slave module 12, that is, the input terminals of the master module 11 and the slave module 12 are short-circuited, and at this time, the working current in the redundant backup constant current to constant voltage circuit flows as follows: terminal CC +, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the master module and the slave module are out of operation, the master module 11 and the slave module 12 are both in a non-operating state, and no output voltage exists at this time.
The control module 13 controls the on/off of the first switch S1, the second switch S2 and the third switch S3 to control the independent operation or the simultaneous operation of the master module 11 and the slave module 12, so as to increase the reliability of the circuit and solve the problem of low reliability of the constant current to constant voltage power supply circuit.
Example 2:
the invention provides a redundant backup constant-current-to-constant-voltage power supply circuit, which comprises a main module 11, a slave module 12, a control module 13, a first switch S1, a second switch S2 and a third switch S3, wherein the main module is connected with the slave module through a first switch S2;
the constant current input terminal CC + is connected to the current input positive electrode N1 of the master module 11, the current input negative electrode N2 of the master module 11 is connected to the current input positive electrode N3 of the slave module 12, and the current input negative electrode N4 of the slave module 12 is connected to the constant current output terminal CC-. The intermediate terminal a of the control module 13 is connected to the current input negative electrode N2 of the master module 11 and the current input terminal positive electrode N3 of the slave module 12, the input terminal B of the control module 13 is connected to the current input positive electrode N1 of the master module 11, and the output terminal C of the control module 13 is connected to the current input negative electrode N4 of the slave module 12; a voltage output positive electrode O1 of the master module 11 is connected to a voltage output positive electrode O3 of the slave module 12, a voltage output negative electrode O2 of the master module 11 is connected to a voltage output negative electrode O4 of the slave module 12, and the first switch S1, the second switch S2, and the third switch S3 are all connected between an intermediate terminal and an input terminal of the control module 13;
the control module 13 is configured to receive a current state signal and a voltage state signal of the master module 11 and a current state signal and a voltage state signal of the slave module 12 to obtain a received signal, and control on/off states of the first switch S1, the second switch S2, and the third switch S3 based on the received signal;
the first switch S1, the second switch S2 and the third switch S3 are used for controlling the working states of the master module 11 and the slave module 12 through different on-off states;
the main module 11 is configured to implement conversion from a Constant Current (CC) to a Constant Voltage (CV) during operation;
the slave module 12 is configured to, in operation, implement a conversion from a Constant Current (CC) to a Constant Voltage (CV).
Specifically, a constant current flows between the current input positive electrode N1 and the current input negative electrode N2 of the main module 11, the current may be in the forward direction or in the reverse direction, a constant voltage is output between the voltage output positive electrode O1 and the voltage output negative electrode O2, and the voltage direction is fixed; constant current flows between the current input anode N3 and the current input cathode N3 of the module 12, the current can be in a forward direction or a reverse direction, constant voltage is output between the voltage output anode O3 and the voltage output cathode O4, and the voltage direction is fixed.
The core circuits of the master module 11 and the slave module 12 of the redundant backup constant-current to constant-voltage power supply circuit are CC to CV circuits, and the CC to CV circuits are called constant-current (CC) to constant-voltage (CV) circuits. The CC-to-CV circuit mainly functions to convert an input constant current signal into a constant voltage signal for output, where the input constant current signal is, of course, a direct current rather than an alternating current, but the direct current has a certain range, and even some direct currents support wide-range input, for example, a constant current of 1.5A (ampere times) is input, but the direct current range supports 0.5A to 2.0A, etc. The output of the CC-to-CV circuit is a constant voltage signal, which means that the output voltage is a constant voltage, and when the output load changes, the output voltage is basically constant, but the output voltage of the actual product slightly changes with the change of the output power due to the load modulation effect, but the change still falls within the allowable range of the operation of the product, for example, the output voltage is 12V, but when the load changes from 0W (watt) to 30W, the change range of the output voltage is 11.5V to 13V, and the change range is allowable.
Receiving the current state signal and the voltage state signal of the master module 11 and the current state signal and the voltage state signal of the slave module 12 through the control module 13 to obtain a receiving signal, and controlling the on-off states of the first switch S1, the second switch S2 and the third switch S3 based on the receiving signal; the first switch S1, the second switch S2 and the third switch S3 control the working states of the master module 11 and the slave module 12 through different on-off states; the main module 11 realizes the conversion from constant current to constant voltage when in operation; the slave module 12 realizes the conversion from constant current to constant voltage during operation, and the control module 13 controls the on/off of the first switch S1, the second switch S2 and the third switch S3 to control the independent operation or simultaneous operation of the master module 11 and the slave module 12, so as to increase the reliability of the circuit and solve the problem of low reliability of the constant current to constant voltage power supply circuit.
Further, the control module 13 includes a voltage stabilizing circuit 131, a linear power circuit 132, a micro MCU circuit 133, and a switch circuit 134, where the voltage stabilizing circuit 131, the linear power circuit 132, the micro MCU circuit 133, and the switch circuit 134 are connected in sequence;
the voltage stabilizing circuit 131 is configured to shunt an input total current, clamp a voltage, and transmit the clamped voltage to the linear power supply circuit 132;
the linear power supply circuit 132 is configured to perform voltage conversion on the clamped voltage to obtain a stable voltage, and transmit the stable voltage to the micro MCU circuit 133;
the micro MCU circuit 133 is configured to receive the current status signal and the voltage status signal of the master module 11 and the current status signal and the voltage status signal of the slave module 12 to obtain receiving signals, output a first control signal K1, a second control signal K2, and a third control signal K3 based on the receiving signals, and transmit the stable voltage to the switch circuit 134;
the switch circuit 134 controls the on/off states of the first switch S1, the second switch S2, and the third switch S3 based on the first control signal K1, the second control signal K2, and the third control signal K3.
Further, when the first control signal K1, the second control signal K2 and the third control signal are off, on and off, respectively;
the switch circuit 134 controls the first switch S1, the second switch S2, and the third switch S3 to be in an off state, an on state, and an off state, respectively, at this time, the main module 11 operates alone, the shunted current enters the input electrode of the main module 11, and the stable voltage is output from the output terminal of the main module 11.
The single master module 11 operates in a mode, in which the control module 13 is connected to P1-P3, and short-circuits the input current of the slave module 12, that is, the terminal N3 and the terminal N4 of the slave module 12 are short-circuited, and the operating current in the redundant backup constant-current to constant-voltage circuit flows as follows: terminal CC +, terminal N1 of main module 11, terminal N2 of main module 11, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the master module 11 is operating, only the master module 11 is operating and converts the input constant current into a constant voltage output, and the slave module 12 does not operate and has no voltage output.
Further, when the first control signal K1, the second control signal K2, and the third control signal are turned on, turned off, and turned off, respectively;
the switch circuit 134 controls the first switch S1, the second switch S2, and the third switch S3 to be in an on state, an off state, and an off state, respectively, at this time, the slave module 12 operates alone, the shunted current enters the input pole of the slave module 12, and the stable voltage is output from the output terminal of the slave module 12.
The independent slave module operating mode, in which the control module 13 is connected to P1-P2 to short-circuit the input current of the master module 11, that is, the terminal N1 and the terminal N2 of the master module 11 are short-circuited, and the operating current flow in the redundant backup constant-current to constant-voltage circuit is as follows: terminal CC +, terminal P2 of control module 13, terminal P1 of control module 13, terminal N3 of slave module 12, terminal N4 of slave module 12, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the slave module 12 is operated, only the slave module 12 is operated and converts the input constant current into the constant voltage output, and the master module 11 is not operated and has no voltage output.
Further, when the first control signal K1, the second control signal K2 and the third control signal are turned off, turned off and turned off, respectively;
the switch circuit 134 controls the first switch S1, the second switch S2, and the third switch S3 to be in an off state, and an off state, respectively, at this time, the master module 11 and the slave module 12 operate simultaneously, the shunted current enters the input pole of the master module 11 and then enters the input pole of the slave module 12, and the stable voltage is output from the output terminals of the master module 11 and the slave module 12 simultaneously and is connected in parallel at the output terminal.
Master-slave module backup (master module 11 and slave module 12 working simultaneously) operating mode, as shown in the schematic diagram 5 in the embodiment. At this time, the terminals P1, P2, and P3 of the control module 13 are not connected, the master module 11 and the slave module 12 are both in a working state, and the working current flow direction in the redundant backup constant-current to constant-voltage conversion circuit is as follows: terminal CC +, terminal N1 of master module 11, terminal N2 of master module 11, terminal N3 of slave module 12, terminal N4 of slave module 12, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the master module and the slave module work in a backup mode, the master module 11 and the slave module 12 are both in a working state, input constant current is converted into constant voltage output, and the constant voltage output is connected in parallel at the output end.
Further, when the master module and the slave module perform backup operation, the master module 11 and the slave module 12 may be designed to be in a current sharing operation state when they output in parallel, and at this time, a single or multiple communication control lines are provided between the master module 11 and the slave module 12, so as to achieve approximately equal output power when the two modules operate simultaneously.
Further, when the first control signal K1, the second control signal K2, and the third control signal are turned off, and turned on, respectively;
the switch circuit 134 controls the first switch S1, the second switch S2 and the third switch S3 to be in an off state, an off state and an on state, respectively, when the master module 11 and the slave module 12 are both deactivated.
Exiting the working mode, at this time, the terminal P2 and the terminal P3 of the control module 13 are connected, the current does not flow through the master module 11 and the slave module 12, that is, the input terminals of the master module 11 and the slave module 12 are short-circuited, and at this time, the working current in the redundant backup constant current to constant voltage circuit flows as follows: terminal CC +, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The output of the master module 11 and the slave module 12 is a constant voltage, and the output voltage is in parallel, that is, the positive output terminal O1 of the master module 11 and the positive output terminal O3 of the slave module 12 are connected and used as the positive output CV + of the redundant backup constant current to constant voltage circuit, and the negative output terminal O2 of the master module 11 and the negative output terminal O4 of the slave module 12 are connected and used as the negative output CV-of the redundant backup constant current to constant voltage circuit. When the master module and the slave module are out of operation, the master module 11 and the slave module 12 are both in a non-operating state, and no output voltage exists at this time.
Specifically, the voltage regulator circuit 131 at least includes a first resistor, a first capacitor, and a first voltage regulator tube, and may also include a plurality of resistors connected in series and parallel, a plurality of capacitors connected in series and parallel, and a plurality of voltage regulator tubes connected in series and parallel. The first resistor in the voltage regulator circuit 131 mainly functions to limit the current flowing through the first regulator tube in the voltage regulator circuit 131 and the following linear power circuit 132, and when the voltage between the input terminal B and the output terminal C of the control module 13 fluctuates, the voltage flowing through the voltage regulator circuit 131 correspondingly fluctuates, and at this time, the resistor can play a role in protection. The first regulator tube limits the maximum output voltage at both ends in the voltage regulator circuit 131, and plays a role in protecting the linear power circuit 132. The first capacitor stores energy therein, and the energy stored by the first capacitor can prevent the fluctuation of the output voltage when the power of the linear power circuit 132 fluctuates.
The linear power supply circuit 132 generally employs a Low Dropout Regulator (LDO) circuit with high reliability and Low output ripple, the input voltage may fluctuate in a higher range, the output voltage is constant, and the LDO circuit has a certain power output capability and can provide power for the following micro MCU circuit 133 and the following switching circuit 134.
The micro MCU 133 is a programmable single chip microcomputer circuit or an FPGA circuit, the power supply of the micro MCU is provided by VCC of the linear power circuit 132, the common terminal is an output terminal C of the control module 13, the input status signal at least includes a current status signal C1 of the main module 11, a voltage status signal V2 of the main module 11, a current status signal of the slave module 12, and a voltage status signal of the slave module 12, and the output control signals K1, K2, and K3 are respectively output to the switch circuit 134 for controlling the switch S1, the switch S2, and the switch S3.
In order to improve the intelligent management degree of the redundant backup constant-current to constant-voltage power supply circuit, the micro MCU 133 further includes a communication circuit, which may adopt an RS232 circuit, an RS485 circuit, a CAN bus circuit, an ethernet circuit, or optical communication, and the state of the communication circuit is generally transmitted to the terminal user directly or after being connected to other host devices.
The circuit that has adopted three isolation relay or three isolation opto-coupler to constitute among the switch circuit 134, its input control signal is control signal K1, control signal K2, the control signal K3 that micro MCU circuit 133 provided respectively, corresponds respectively three switch S1, switch S2, the switch S3 of control module 13, works as when the level of three control signal K1, K2, K3 is the high level, corresponding switch S1, S2, S3 switch on, works as when the level of three control signal K1, K2, K3 is the low level, corresponding switch S1, S2, S3 switch off.
One embodiment of the switching circuit 134 is as follows: the control signal K1 is connected with a base electrode of the first triode, an emitting electrode of the first triode is connected with an output terminal C of the control module 13, a collector electrode of the first triode is connected with one input end of the first isolation relay, the other input end of the first isolation relay is connected with one end of the second resistor, the other end of the second resistor is connected with the output voltage VCC of the linear power circuit 132, one output end of the first isolation relay is connected with one terminal P1 of the switch S1, and the other output end of the first isolation relay is connected with the other terminal P2 of the switch S1; the control signal K2 is connected to the base of the second triode, the emitter of the second triode is connected to the output terminal C of the control module 13, the collector of the second triode is connected to one input terminal of the second isolation relay, the other input terminal of the second isolation relay is connected to one end of the third resistor, the other end of the third resistor is connected to the output voltage VCC of the linear power circuit 132, one output terminal of the second isolation relay is connected to one terminal P3 of the switch S2, and the other output terminal is connected to the other terminal P1 of the switch S2; the base of the third triode is connected with a control signal K3, the emitter of the third triode is connected with the output terminal C of the control module 13, the collector of the third triode is connected with one input end of a third isolation relay, one end of a fourth resistor is connected with the other input end of the third isolation relay, the other end of the fourth resistor is connected with the output voltage VCC of the linear power circuit 132, one output end of the third isolation relay is connected with one terminal P2 of a switch S3, one end of a fifth resistor is connected with the other output end of the third isolation relay, and the other end of the fifth resistor is connected with the other terminal P3 of the switch S3. The isolating relay can be replaced by an isolating optocoupler, and the circuit is realized as the same as the isolating relay, only has a little change on the parameter of the circuit, and is mainly embodied in that the driving currents of the isolating relay and the isolating optocoupler are different, and the required power and the driving current are different.
The states of the switches S1, S2, and S3 in the control module 13 are determined according to the high and low levels of the current state signal C1, the current state signal C2, the voltage state signal V1, and the voltage state signal V2, where a high level "1" indicates that the corresponding current state or voltage state is present or valid, and a low level "0" indicates that the corresponding current state or voltage state is absent or invalid, and the following table shows the output current states of the master module 11 and the slave module 13, and the indication of the mode selection and determination of the corresponding control module 13.
TABLE 1 mode selection and determination by the control module 13
Figure BDA0003786133680000141
Figure BDA0003786133680000151
"√" indicates that the switch for is on; "x" indicates that the corresponding switch is off.
The mode of operation of the table above is explained below.
The single master module works: firstly, the switch S1, the switch S2 and the switch S3 are all disconnected; the master module 11 and the slave module 12 are both connected to the system to work, and at this time, the current state signal C1 and the voltage state signal V1 of the master module 11 and the current state signal C2 and the voltage state signal V2 of the slave module 12 will generate a high level "1" or a low level "0", and the system records state information; then, the control module 13 sends a control signal K1 of low level "0", a control signal K2 of high level "1", and a control signal K3 of low level "0", and controls the switch S1 to be turned off, the switch S2 to be turned on, and the switch S3 to be turned off; the whole machine enters the working mode of the independent main module.
The slave module 12 alone works: firstly, the switch S1, the switch S2 and the switch S3 are all disconnected; the master module 11 and the slave module 12 are both connected to the system to work, and at this time, the current state signal C1 and the voltage state signal V1 of the master module 11 and the current state signal C2 and the voltage state signal V2 of the slave module 12 will generate a high level "1" or a low level "0", and the system records state information; then, the control module 13 sends a control signal K1 of high level "1", a control signal K2 of low level "0", and a control signal K3 of low level "0", and controls the switch S1 to be closed, the switch S2 to be opened, and the switch S3 to be opened; the complete machine enters the working mode of the independent slave module 12.
Backup work of a master module and a slave module: firstly, the switch S1, the switch S2 and the switch S3 are all disconnected; the master module 11 and the slave module 12 are both connected to the system to work, and at this time, the current state signal C1 and the voltage state signal V1 of the master module 11 and the current state signal C2 and the voltage state signal V2 of the slave module 12 will generate a high level "1" or a low level "0", and the system records state information; then, the control module 13 sends a control signal K1 of low level "0", a control signal K2 of low level "0", and a control signal K3 of low level "0", and controls the switch S1 to be turned off, the switch S2 to be turned off, and the switch S3 to be turned off; the whole machine enters a master-slave module backup working mode.
And (4) exiting the working mode: firstly, the switch S1, the switch S2 and the switch S3 are all disconnected; the master module 11 and the slave module 12 are both connected to the system to work, and at this time, the current state signal C1 and the voltage state signal V1 of the master module 11 and the current state signal C2 and the voltage state signal V2 of the slave module 12 will generate a high level "1" or a low level "0", and the system records state information; then, the control module 13 sends a control signal K1 of low level "0", a control signal K2 of low level "0", and a control signal K3 of high level "1", and controls the switch S1 to be opened, the switch S2 to be opened, and the switch S3 to be closed; the whole machine enters a quitting working mode.
Referring to fig. 1 to 9, in a second aspect, the present invention provides a method for controlling a redundant backup constant current to constant voltage power circuit, including the following steps:
s1, the first switch S1, the second switch S2 and the third switch S3 are controlled to be switched off through the switch circuit 134, so that the master module 11 and the slave module 12 are connected to the system to work;
s2, the micro MCU circuit 133 acquires a current state signal of the master module 11 and a current state signal of the slave module 12, and simultaneously acquires a voltage state signal of the master module 11 and a voltage state signal of the slave module 12 to obtain a receiving signal;
and S3, judging the fault condition of the master module 11 or the slave module 12 according to the received signal, and controlling the on-off conditions of the first switch S1, the second switch S2 and the third switch S3 through the switch circuit 134 based on the fault condition.
Specifically, the micro MCU circuit 133 obtains current state signals and voltage state signals of the master module 11 and the slave module 12, and if the current state signal C1 of the master module 11 is 1, the current state signal C2 of the slave module 12 is 1, the voltage state signal V1 of the master module 11 is 1, and the voltage state signal V2 of the slave module 12 is 1, the master module 11 and the slave module 12 have no fault, and the switch circuit 134 controls the first switch S1, the second switch S2, and the third switch S3 to be turned off;
the micro MCU circuit 133 obtains current state signals and voltage state signals of the master module 11 and the slave module 12, if the current state signal of the master module 11 is 1, the current state signal of the slave module 12 is 0, the voltage state signal of the master module 11 is 1, and the voltage state signal of the slave module 12 is 1, the master module 11 fails, the slave module 12 operates normally, and the switch circuit 134 controls the first switch S1 to be closed, the second switch S2 to be opened, and the third switch S3 to be opened;
the micro MCU circuit 133 obtains the current state signal and the voltage state signal of the master module 11 and the slave module 12, if the current state signal of the master module 11 is 1, the current state signal of the slave module 12 is 1, the voltage state signal of the master module 11 is 1, and the voltage state signal of the slave module 12 is 0, the master module 11 is normal, the slave module 12 fails, the system enters the working mode of the single master module 11, and the switch circuit 134 controls the first switch S1 to be turned off, the second switch S2 to be turned on, and the third switch S3 to be turned off;
the micro MCU circuit 133 obtains the current state signal and the voltage state signal of the master module 11 and the slave module 12, and if the current state signal of the master module 11 is 1, the current state signal of the slave module 12 is 0, the voltage state signal of the master module 11 is 1, and the voltage state signal of the slave module 12 is 0, both the master module 11 and the slave module 12 have a fault, and the switch circuit 134 controls the first switch S1 to be open, the second switch S2 to be open, and the third switch S3 to be closed.
Although the present invention has been described with reference to a preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but rather, the invention is capable of other forms and embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (9)

1. A redundant backup constant current-to-constant voltage power circuit is characterized in that,
the device comprises a master module, a slave module, a control module, a first switch, a second switch and a third switch;
the constant current input terminal is connected with the current input anode of the master module, the current input cathode of the master module is connected with the current input anode of the slave module, and the current input cathode of the slave module is connected with the constant current output terminal; the intermediate terminal of the control module is connected with the current input negative electrode of the master module and the current input terminal positive electrode of the slave module, the input terminal of the control module is connected with the current input positive electrode of the master module, and the output terminal of the control module is connected with the current input negative electrode of the slave module; the voltage output positive pole of the master module is connected with the voltage output positive pole of the slave module, the voltage output negative pole of the master module is connected with the voltage output negative pole of the slave module, and the first switch, the second switch and the third switch are all connected between the middle terminal and the input terminal of the control module;
the control module is used for receiving the current state signal and the voltage state signal of the master module and the current state signal and the voltage state signal of the slave module to obtain a receiving signal, and controlling the on-off state of the first switch, the second switch and the third switch based on the receiving signal;
the first switch, the second switch and the third switch are used for controlling the working states of the master module and the slave module through different on-off states;
the main module is used for realizing conversion from constant current to constant voltage during operation;
the slave module is used for realizing conversion from constant current to constant voltage during operation.
2. The redundant backup constant current to constant voltage power supply circuit of claim 1,
the control module comprises a voltage stabilizing circuit, a linear power supply circuit, a micro MCU circuit and a switch circuit, wherein the voltage stabilizing circuit, the linear power supply circuit, the micro MCU circuit and the switch circuit are sequentially connected;
the voltage stabilizing circuit is used for shunting input total current, then clamping voltage, and transmitting the clamped voltage to the linear power supply circuit;
the linear power supply circuit is used for carrying out voltage conversion on the clamped voltage to obtain a stable voltage and transmitting the stable voltage to the micro MCU circuit;
the micro MCU circuit is used for receiving the current state signal and the voltage state signal of the master module and the current state signal and the voltage state signal of the slave module to obtain a receiving signal, outputting a first control signal, a second control signal and a third control signal based on the receiving signal, and transmitting the stable voltage to the switch circuit;
the switch circuit controls the on-off states of the first switch, the second switch and the third switch based on the first control signal, the second control signal and the third control signal.
3. The redundant backup constant current to constant voltage power supply circuit of claim 2,
the switch circuit comprises a circuit formed by three isolating relays or a circuit formed by three isolating optocouplers.
4. The redundant backup constant current to constant voltage power supply circuit of claim 2,
when the first control signal, the second control signal, and the third control signal are off, on, and off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an off state, an on state and an off state respectively, at the moment, the main module works independently, the shunted current enters an input pole of the main module, and the stable voltage is output from an output terminal of the main module.
5. The redundant backup constant current to constant voltage power supply circuit of claim 2,
when the first control signal, the second control signal, and the third control signal are turned on, turned off, and turned off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an on state, an off state and an off state respectively, at the moment, the slave module works independently, the shunted current enters an input pole of the slave module, and the stable voltage is output from an output terminal of the slave module.
6. The redundant backup constant current to constant voltage power supply circuit of claim 2,
when the first control signal, the second control signal, and the third control are turned off, and turned off, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in a disconnected state, a disconnected state and a disconnected state respectively, at the moment, the master module and the slave module work simultaneously, the shunted current enters an input pole of the master module and then enters an input pole of the slave module, and the stable voltage is output from output terminals of the master module and the slave module simultaneously and is connected in parallel at an output end.
7. The redundant backup constant current to constant voltage power supply circuit of claim 2,
when the first control signal, the second control signal, and the third control signal are turned off, and turned on, respectively;
the switch circuit controls the first switch, the second switch and the third switch to be in an off state, an off state and an on state respectively, and at the moment, the master module and the slave module are all withdrawn from operation.
8. A control method of a redundant backup constant-current to constant-voltage power supply circuit is applied to the redundant backup constant-current to constant-voltage power supply circuit in claims 1-7, and is characterized by comprising the following steps:
the first switch, the second switch and the third switch are controlled to be switched off through the switch circuit, so that the master module and the slave module are connected to the system to work;
the micro MCU circuit acquires a current state signal of the master module and a current state signal of the slave module, and simultaneously acquires a voltage state signal of the master module and a voltage state signal of the slave module to obtain a receiving signal;
and judging the fault condition of the master module or the slave module according to the received signal, and controlling the on-off conditions of the first switch, the second switch and the third switch through a switch circuit based on the fault condition.
9. The method of claim 8, wherein the redundancy backup constant current to constant voltage power supply circuit control method,
the specific way of judging the fault condition of the master module or the slave module according to the received signal and controlling the on-off conditions of the first switch, the second switch and the third switch through the switch circuit based on the fault condition is as follows:
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 1, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 1, the master module and the slave module have no fault, and the first switch, the second switch and the third switch are controlled to be switched off through the switch circuit;
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 0, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 1, the master module fails, the slave module works normally, and the first switch, the second switch and the third switch are controlled to be closed, opened and closed through the switch circuit;
the micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, if the current state signal of the master module is 1, the current state signal of the slave module is 1, the voltage state signal of the master module is 1 and the voltage state signal of the slave module is 0, the master module is normal, the slave module fails, the system enters an independent master module working mode, and the first switch, the second switch and the third switch are controlled to be turned off through the switch circuit;
the micro MCU circuit obtains current state signals and voltage state signals of the master module and the slave module, if the current state signals of the master module are 1, the current state signals of the slave module are 0, the voltage state signals of the master module are 1 and the voltage state signals of the slave module are 0, the master module and the slave module both have faults, and the first switch, the second switch and the third switch are controlled to be opened and closed through the switch circuit.
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