CN115395636B - Redundant backup constant-current-constant-voltage power supply circuit and control method - Google Patents

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

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Publication number
CN115395636B
CN115395636B CN202210942143.9A CN202210942143A CN115395636B CN 115395636 B CN115395636 B CN 115395636B CN 202210942143 A CN202210942143 A CN 202210942143A CN 115395636 B CN115395636 B CN 115395636B
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module
switch
voltage
current
constant
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CN115395636A (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 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 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 conversion from constant current to constant voltage during operation; the control module is used for controlling the on-off of the three switches so as to control the independent operation or the simultaneous operation of the master module and the slave module, thereby solving the problem of lower reliability of the constant current-constant voltage power supply circuit.

Description

Redundant backup constant-current-constant-voltage power supply circuit and control method
Technical Field
The invention relates to the technical field of constant current-constant voltage power supply circuits, in particular to a redundant backup constant current-constant voltage power supply circuit and a control method thereof.
Background
The constant current-to-constant voltage power supply circuit is a power conversion circuit which converts a constant current into a constant voltage output, and the input signal is a constant current source and the output signal is a constant voltage signal. In some remote power supply systems and remote power distribution systems, a constant-current-to-constant-voltage circuit can realize single-wire current signal input, double-wire constant-voltage output and output voltage for electric equipment working in a voltage mode.
Constant current to constant voltage power supply circuits have an important role in some application occasions. For example, in a submarine optical cable system power supply and distribution network in a marine information network, because the transmission distance of a submarine cable is hundreds of kilometers or even thousands of kilometers, remote constant-current power supply is generally adopted for power supply of the submarine cable to improve the reliability of the system, and at the moment, electric equipment in the submarine cable is generally called a constant-current power supply 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 is from a few watts to a 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 occasion is remote monitoring equipment in remote places, such as remote mountain top monitoring camera power distribution systems, and in underwater monitoring systems of ponds or reservoirs, constant voltage power supply is adopted to cause abnormal operation of electric equipment due to overlarge voltage drop of cables due to long transmission distance, so that higher cable cost is required, constant current power supply is adopted, common cables are adopted, constant current power supply is adopted, and 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 constant-voltage power supply circuit and a control method, and aims to solve the problem of low reliability of the constant-current 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, which includes 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 positive electrode of the main module, the current input negative electrode of the main module is connected with the current input positive electrode of the auxiliary module, and the current input negative electrode of the auxiliary module is connected with the constant current output terminal; the middle terminal of the control module is connected with the current input cathode of the main module and the current input terminal anode of the slave module, the input terminal of the control module is connected with the current input anode of the main module, and the output terminal of the control module is connected with the current input cathode of the slave module; the voltage output positive electrode of the main module is connected with the voltage output positive electrode of the auxiliary module, the voltage output negative electrode of the main module is connected with the voltage output negative electrode of the auxiliary 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 receiving signals and controlling the on-off states of the first switch, the second switch and the third switch based on the receiving signals;
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 in 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 dividing the input total current, then clamping the voltage, and transmitting the clamped voltage to the linear power supply circuit;
the linear power supply circuit is used for performing 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 receiving signals, outputting a first control signal, a second control signal and a third control signal based on the receiving signals, and transmitting the stable voltage to the switch circuit;
the switching 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 isolation relays or a circuit formed by three isolation optocouplers.
Wherein when the first control signal, the second control signal and the third control signal are off, on and off, respectively;
The switching 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 this time, the main module works independently, the split current enters an input pole 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, disconnected, and disconnected, respectively;
The switching circuit controls the first switch, the second switch and the third switch to be in an off state, an off state and an off state respectively, at this time, the master module and the slave module work simultaneously, the split 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 switching 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 out of operation.
In a second aspect, the present invention provides a control method for a redundant backup constant current to constant voltage power supply circuit, including the following steps:
The first switch, the second switch and the third switch are controlled to be disconnected through the switch circuit, so that the master module and the slave module are connected into the system to work;
The micro MCU circuit obtains a current state signal of the master module and a current state signal of the slave module, and simultaneously obtains 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 condition of the first switch, the second switch and the third switch through the switch circuit based on the fault condition.
The specific mode of judging the fault condition of the master module or the slave module according to the received signal and controlling the on-off condition 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, and if the current state signals of the master module are 1, the current state signals of the slave module are 1, the voltage state signals of the master module are 1, and the voltage state signals of the slave module are 1, the master module and the slave module have no faults, 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 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 1, the master module is in fault, the slave module works normally, and the first switch is controlled to be closed, the second switch is controlled to be opened, and the third switch is controlled to be opened 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 signals of the master module are 1, the current state signals of the slave module are 1, the voltage state signals of the master module are 1, and the voltage state signals of the slave module are 0, the master module is normal, the slave module is in fault, the system enters an independent master module working mode, and the first switch is controlled to be opened, the second switch is controlled to be closed, and the third switch is controlled to be opened through the switch circuit;
The micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, and 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 are in failure, and the first switch is controlled to be opened, the second switch is controlled to be opened, and the third switch is controlled to be closed through the switch circuit.
According to the redundant backup constant-current-to-constant-voltage power supply circuit, 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 auxiliary module are received through the control 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 conversion from constant current to constant voltage during operation; the slave module realizes conversion from constant current to constant voltage when in operation, and the control module controls the on-off of the first switch, the second switch and the third switch to control the independent operation or simultaneous operation 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 invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
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 schematic diagram of the operation of the slave module.
Fig. 4 is a schematic diagram of the simultaneous operation of the master and slave modules.
Fig. 5 is a schematic diagram of the master and slave each being taken out of operation.
Fig. 6 is a schematic diagram of a control module.
Fig. 7 is a schematic diagram of another implementation of a control module.
Fig. 8 is a flowchart of a control method for a redundant backup constant current to constant voltage power supply circuit.
Fig. 9 is a schematic diagram of a control method of a redundant backup constant-current constant-voltage power supply circuit provided by the invention.
11-Master module, 12-slave module, 13-control module, 131-voltage stabilizing circuit, 132-linear power circuit, 133-micro MCU circuit, 134-switch circuit.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not 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 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;
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-. An 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, an input terminal B of the control module 13 is connected to the current input positive electrode N1 of the master module 11, and an output terminal C of the control module 13 is connected to the current input negative electrode N4 of the slave module 12; the voltage output positive electrode O1 of the master module 11 is connected to the voltage output positive electrode O3 of the slave module 12, the voltage output negative electrode O2 of the master module 11 is connected to the 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 the intermediate terminal and the input terminal of the control module 13;
the control module 13 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, obtain a received signal, and control the 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 implement conversion from a Constant Current (CV) to a Constant Voltage (CV) during operation.
The master module 11 and the slave module 12 function to implement conversion from a Constant Current (CC) to a Constant Voltage (CV); constant current flows between the current input positive electrode N1 and the current input negative electrode N2 of the main module 11, the current can be positive or reverse, constant voltage is output between the voltage output positive electrode O1 and the voltage output negative electrode O2, and the voltage direction is fixed; a constant current flows between the current input positive electrode N3 and the current input negative electrode N3 of the module 12, the current can be either positive or reverse, a constant voltage is output between the voltage output positive electrode O3 and the voltage output negative electrode O4, and the voltage direction is fixed.
The core circuits of the main module 11 and the slave module 12 of the redundant backup constant current-constant voltage power supply circuit are CC-CV circuits, and the CC-CV circuits are called Constant Current (CC) to Constant Voltage (CV) circuits. The main function of the CC-CV circuit is to convert an input constant current signal into a constant voltage signal for output, where, of course, the input constant current signal refers to that the current is a direct current, not an alternating current, but the direct current is in a certain range, even some of the direct current supports a wide range of direct current, for example, the input constant current is 1.5A (a times), but the direct current range supports 0.5A-2.0A. The CC-to-CV circuit as described herein outputs a constant voltage signal, which means that the output voltage is a constant voltage, and when the output load changes, the output voltage is substantially constant, but the actual product has a slight change along with the change of the output power due to the load modulation effect, and the change is still within the allowable range of the product, for example, the output voltage is dc 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 functions of the redundant backup constant current-to-constant voltage circuit are control and current conversion functions of several working states of two modules (a master module and a slave module) for realizing constant current input, and detailed modes are divided into: the primary module alone, the secondary module 12 alone, the primary and secondary backup, and the exit.
In the single primary module operation mode, the control module 13 is connected with the terminals P1-P3 to short-circuit the input current of the secondary module 12, that is, the terminal N3 and the terminal N4 of the secondary module 12 are short-circuited, and the operation current flow 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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the master module is operated, only the master module 11 is operated and converts the input constant current into constant voltage output, and the slave module 12 is not operated and has no voltage output.
In the working mode of the independent slave module, the control module 13 is connected with the terminals 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 working current flow direction in the redundant backup constant current-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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the slave module works, only the slave module 12 works and converts the input constant current into constant voltage output, and the master module 11 does not work and has no voltage output.
In the master-slave module backup working mode, at this time, terminals P1, P2 and P3 of the control module are all not connected, and the master module 11 and the slave module 12 are both in a working state, at this time, working current flow 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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the master module and the slave module work in backup, the master module 11 and the slave module 12 are in a working state, and the input constant current is converted into constant voltage output, and the output ends are connected in parallel.
Furthermore, in some designs, when the master module and the slave module are in backup operation, the master module 11 and the slave module 12 can be designed to be in a current sharing operation state when being output in parallel, and at this time, a single or multiple communication control lines are arranged between the master module 11 and the slave module 12, so that the output power is approximately equal when the two modules work simultaneously.
The operation mode is exited, at this time, the terminal P2 and the terminal P3 of the control module 13 are connected, and current does not flow through the master module 11 and the slave module 12, that is, the input ends of the master module 11 and the slave module 12 are short-circuited, at this time, the operation current flow in the redundant backup constant current-constant voltage circuit is as follows: terminal cc+, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy 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 in a non-operating state, and no output voltage is generated.
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 lower reliability of the constant-current-to-constant-voltage power supply circuit.
Example 2:
The invention provides a redundant backup constant-current 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;
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-. An 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, an input terminal B of the control module 13 is connected to the current input positive electrode N1 of the master module 11, and an output terminal C of the control module 13 is connected to the current input negative electrode N4 of the slave module 12; the voltage output positive electrode O1 of the master module 11 is connected to the voltage output positive electrode O3 of the slave module 12, the voltage output negative electrode O2 of the master module 11 is connected to the 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 the intermediate terminal and the input terminal of the control module 13;
the control module 13 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, obtain a received signal, and control the 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 implement a conversion from a Constant Current (CC) to a Constant Voltage (CV) during operation.
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 can be either positive or reverse, 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; a constant current flows between the current input positive electrode N3 and the current input negative electrode N3 of the module 12, the current can be either positive or reverse, a constant voltage is output between the voltage output positive electrode O3 and the voltage output negative electrode 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-constant voltage power supply circuit are CC-CV circuits, and the CC-CV circuits are called Constant Current (CC) to Constant Voltage (CV) circuits. The main function of the CC-CV circuit is to convert an input constant current signal into a constant voltage signal for output, where the input constant current signal refers to that the current is a direct current, not an alternating current, but the direct current is in a certain range, even some of the direct current supports a wide range of direct current input, for example, the input constant current is 1.5A (a times), but the direct current range supports 0.5A-2.0A. The CC-to-CV circuit outputs a constant voltage signal, which means that the output voltage is a constant voltage, when the output load changes, the output voltage is basically constant, but the output voltage of the actual product slightly changes along with the change of the output power due to the load modulation effect, and the change is still within the allowable range of the product, for example, the output voltage is dc 12V, but when the load changes from 0W (watt) to 30W, the change range of the output voltage is 11.5V-13V, and the change range is allowable.
Receiving, by the control module 13, 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, and controlling the on-off states of the first switch S1, the second switch S2, and the third switch S3 based on the receiving signals; 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 is used for realizing conversion from constant current to constant voltage during operation; the slave module 12 realizes the conversion from constant current to constant voltage when in 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 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 lower 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 supply circuit 132, a micro MCU circuit 133, and a switch circuit 134, where the voltage stabilizing circuit 131, the linear power supply circuit 132, the micro MCU circuit 133, and the switch circuit 134 are sequentially connected;
the voltage stabilizing circuit 131 is configured to split an input total current, then clamp a voltage, and transmit the clamped voltage to the linear power supply circuit 132;
The linear power 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, obtain a received signal, and output a first control signal K1, a second control signal K2, and a third control signal K3 based on the received signal, and simultaneously 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 turned 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, when the main module 11 is operated independently, the split current enters an input pole of the main module 11, and the stable voltage is output from an output terminal of the main module 11.
In the working mode of the single main module 11, the control module 13 is connected with the terminals P1-P3 to short-circuit 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 working current flow direction in the redundant backup constant current-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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the master module 11 is operated, only the master module 11 is operated and converts the input constant current into constant voltage output, and the slave module 12 is not operated and has no voltage output.
Further, when the first control signal K1, the second control signal K2, and the third control are turned on, off, 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 on state, an off state, and an off state, respectively, when the slave module 12 operates alone, the split 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.
In the working mode of the independent slave module, the control module 13 is connected with the terminals 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 working current flow direction in the redundant backup constant current-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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the slave module 12 works, only the slave module 12 works and converts the input constant current into constant voltage output, and the master module 11 does not work and has no voltage output.
Further, when the first control signal K1, the second control signal K2 and the third control are turned off, disconnected and disconnected, 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, when the master module 11 and the slave module 12 are simultaneously operated, the split 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 simultaneously output from the output terminals of the master module 11 and the slave module 12 and is connected in parallel at the output terminal.
Master-slave backup (master 11 and slave 12 operate simultaneously) mode of operation as shown in example schematic 5. At this time, the terminals P1, P2, and P3 of the control module 13 are all not connected, and the master module 11 and the slave module 12 are both in a working state, and at this time, the working current flow in the redundant backup constant current-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 outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy backup constant current-to-constant voltage circuit. When the master module and the slave module work in backup, the master module 11 and the slave module 12 are in a working state, and the input constant current is converted into constant voltage output, and the output ends are connected in parallel.
Furthermore, when the master module and the slave module are in backup operation, the master module 11 and the slave module 12 can be designed to be in a current sharing operation state when being output in parallel, and at the moment, a single or multiple communication control lines are arranged between the master module 11 and the slave module 12, so that the output power is approximately equal when the two modules are simultaneously operated.
Further, when the first control signal K1, the second control signal K2 and the third control are turned off, off and 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, and an on state, respectively, when the master module 11 and the slave module 12 are both out of operation.
The operation mode is exited, at this time, the terminal P2 and the terminal P3 of the control module 13 are connected, and current does not flow through the master module 11 and the slave module 12, that is, the input ends of the master module 11 and the slave module 12 are short-circuited, at this time, the operation current flow in the redundant backup constant current-constant voltage circuit is as follows: terminal cc+, terminal P1 of control module 13, terminal P3 of control module 13, terminal CC-. The outputs of the master module 11 and the slave module 12 are constant voltages, and the output voltages are in parallel connection, 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 serve as the output positive pole cv+ of the redundancy 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 serve as the output negative pole CV-of the redundancy 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 in a non-operating state, and no output voltage is generated.
Specifically, the voltage stabilizing circuit 131 at least includes a first resistor, a first capacitor, and a first voltage stabilizing 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 stabilizing tubes connected in series and parallel. The first resistor in the voltage stabilizing circuit 131 mainly serves to limit the current flowing through the first voltage stabilizing tube in the voltage stabilizing circuit 131 and the following linear power supply 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 stabilizing circuit 131 correspondingly follows the fluctuation, and at this time, the resistor can play a role of protection. The first voltage regulator tube limits the maximum output voltage at two ends in the voltage regulator circuit 131, and plays a role in protecting the linear power supply circuit 132. The first capacitor stores energy here, and when the power of the linear power supply circuit 132 fluctuates, the energy storage of this first capacitor can prevent fluctuation of the output voltage.
The linear power supply circuit 132 generally adopts an LDO circuit (Low Dropout Regulator, low dropout linear regulator) with high reliability and low output ripple, the input voltage can fluctuate in a higher range, the output voltage is constant, and a certain power output capability is provided, so that power can be provided for the following micro MCU circuit 133 and switch circuit 134.
The micro MCU circuit 133 is a programmable single chip microcomputer circuit, or an FPGA circuit, and the power supply is provided by VCC of the linear power supply circuit 132, the common terminal is the 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 include K1, K2, and K3, which 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 circuit 133 further includes a communication circuit, where the communication circuit may adopt an RS232 circuit, or an RS485 circuit, or a CAN bus circuit, or an ethernet circuit, or an optical communication manner, and the state of the communication circuit is generally directly or after being connected to other main devices, and then transmitted to an end user.
The switch circuit 134 adopts a circuit composed of three isolation relays or three isolation optocouplers, the input control signals of the three isolation relays or the three isolation optocouplers are respectively a control signal K1, a control signal K2 and a control signal K3 provided by the micro MCU circuit 133, the three switches S1, S2 and S3 of the control module 13 are respectively corresponding, when the level of the three control signals K1, K2 and K3 is high, the corresponding switches S1, S2 and S3 are on, and when the level of the three control signals K1, K2 and K3 is low, the corresponding switches S1, S2 and S3 are off.
One embodiment of the switching circuit 134 is as follows: the control signal K1 is connected with the base electrode of the first triode, the emitter electrode of the first triode is connected with the output terminal C of the control module 13, the 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 supply 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 is connected with the other terminal P2 of the switch S1; the control signal K2 is connected with the base electrode of the second triode, the emitter electrode of the second triode is connected with the output terminal C of the control module 13, the collector electrode of the second triode is connected with one input end of the second isolation relay, the other input end of the second isolation relay is connected with one end of the third resistor, the other end of the third resistor is connected with the output voltage VCC of the linear power supply circuit 132, one output end of the second isolation relay is connected with one terminal P3 of the switch S2, and the other output end is connected with the other terminal P1 of the switch S2; the control signal K3 is connected with the base electrode of the third triode, the emitter electrode of the third triode is connected with the output terminal C of the control module 13, the collector electrode of the third triode is connected with one input end of the third isolation relay, the other input end of the third isolation relay is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the output voltage VCC of the linear power supply circuit 132, one output end of the third isolation relay is connected with one terminal P2 of the switch S3, the other output end of the third isolation relay is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the other terminal P3 of the switch S3. The isolation relay can also be replaced by an isolation optocoupler, and the implementation circuit is the same as that of the isolation relay, only a small change in parameters of the circuit is realized, and the characteristics of different driving currents of the isolation relay and the isolation optocoupler are mainly reflected in different required power and different driving currents.
The states of the switches S1, S2, S3 in the control module 13 are determined according to the high-low level of the current state signal C1, the current state signal C2, the voltage state signal V1, and the voltage state signal V2, where the high level "1" indicates that the corresponding current state or voltage state is present or valid, and the low level "0" indicates that the corresponding current state or voltage state is absent or invalid, and the following table indicates the output current states of the master module 11 and the slave module 13, and the mode selection and determination of the corresponding control module 13 are indicated.
Table 1 mode selection and determination of control module 13
"V" indicates that the switch for is on; "X" indicates that the corresponding switch is open.
The operation modes of the above table are explained below.
The individual main modules work: firstly, the switch S1, the switch S2 and the switch S3 are all opened; at this time, both the master module 11 and the slave module 12 are connected to the system to operate, 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 generate a high level "1" or a low level "0", so that the system records state information; then the control module 13 sends a control signal K1 to be low level 0, a control signal K2 to be high level 1 and a control signal K3 to be low level 0, and controls the switch S1 to be opened, the switch S2 to be closed and the switch S3 to be opened; the whole machine enters an independent main module working mode.
The slave module 12 alone works: firstly, the switch S1, the switch S2 and the switch S3 are all opened; at this time, both the master module 11 and the slave module 12 are connected to the system to operate, 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 generate a high level "1" or a low level "0", so that 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", 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 individual slave module 12 mode of operation.
Master-slave module backup work: firstly, the switch S1, the switch S2 and the switch S3 are all opened; at this time, both the master module 11 and the slave module 12 are connected to the system to operate, 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 generate a high level "1" or a low level "0", so that 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", 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 (5) exiting the working mode: firstly, the switch S1, the switch S2 and the switch S3 are all opened; at this time, both the master module 11 and the slave module 12 are connected to the system to operate, 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 generate a high level "1" or a low level "0", so that 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", 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 an exit working mode.
Referring to fig. 1 to 9, in a second aspect, the present invention provides a control method for a redundant backup constant current to constant voltage power supply circuit, comprising the following steps:
s1, a switching circuit 134 is used for controlling the first switch S1, the second switch S2 and the third switch S3 to be opened, so that the master module 11 and the slave module 12 are connected into 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 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;
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 condition 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 MCU circuit 133 obtains the current status signals and the voltage status signals of the master module 11 and the slave module 12, and if the current status signal C1 of the master module 11 is 1, the current status signal C2 of the slave module 12 is 1, the voltage status signal V1 of the master module 11 is 1, and the voltage status 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 MCU circuit 133 obtains the current status signals and the voltage status signals of the master module 11 and the slave module 12, if the current status signal of the master module 11 is 1, the current status signal of the slave module 12 is 0, the voltage status signal of the master module 11 is 1, and the voltage status signal of the slave module 12 is 1, the master module 11 fails, the slave module 12 works 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 MCU circuit 133 obtains the current status signals and the voltage status signals of the master module 11 and the slave module 12, if the current status signal of the master module 11 is 1, the current status signal of the slave module 12 is 1, the voltage status signal of the master module 11 is 1, and the voltage status signal of the slave module 12 is 0, the master module 11 is normal, the slave module 12 fails, the system enters an independent master module 11 working mode, and the switch circuit 134 controls the first switch S1 to be opened, the second switch S2 to be closed, and the third switch S3 to be opened;
The MCU circuit 133 obtains the current status signals and the voltage status signals of the master module 11 and the slave module 12, and if the current status signal of the master module 11 is 1, the current status signal of the slave module 12 is 0, the voltage status signal of the master module 11 is 1, and the voltage status signal of the slave module 12 is 0, the master module 11 and the slave module 12 are failed, and the switch circuit 134 controls the first switch S1 to be opened, the second switch S2 to be opened, and the third switch S3 to be closed.
The foregoing disclosure is only a preferred embodiment of a redundant backup constant current to constant voltage power supply circuit and control method of the present invention, and it is needless to say that the scope of the invention is not limited thereto.

Claims (9)

1. A redundant backup constant current-constant voltage power supply 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 positive electrode of the main module, the current input negative electrode of the main module is connected with the current input positive electrode of the auxiliary module, and the current input negative electrode of the auxiliary module is connected with the constant current output terminal; the middle terminal of the control module is connected with the current input cathode of the main module and the current input terminal anode of the slave module, the input terminal of the control module is connected with the current input anode of the main module, and the output terminal of the control module is connected with the current input cathode of the slave module; the voltage output positive electrode of the main module is connected with the voltage output positive electrode of the auxiliary module, the voltage output negative electrode of the main module is connected with the voltage output negative electrode of the auxiliary 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 receiving signals and controlling the on-off states of the first switch, the second switch and the third switch based on the receiving signals;
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 in operation.
2. The redundant backup constant current to constant voltage power supply circuit according to claim 1, wherein,
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 dividing the input total current, then clamping the voltage, and transmitting the clamped voltage to the linear power supply circuit;
the linear power supply circuit is used for performing 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 receiving signals, outputting a first control signal, a second control signal and a third control signal based on the receiving signals, and transmitting the stable voltage to the switch circuit;
the switching 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 according to claim 2, wherein,
The switch circuit comprises a circuit formed by three isolation relays or a circuit formed by three isolation optocouplers.
4. The redundant backup constant current to constant voltage power supply circuit according to claim 2, wherein,
When the first control signal, the second control signal and the third control signal are off, on and off, respectively;
The switching 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 this time, the main module works independently, the split 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 according to claim 2, 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.
6. The redundant backup constant current to constant voltage power supply circuit according to claim 2, wherein,
When the first control signal, the second control signal and the third control are turned off, disconnected and disconnected, respectively;
The switching circuit controls the first switch, the second switch and the third switch to be in an off state, an off state and an off state respectively, at this time, the master module and the slave module work simultaneously, the split 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 according to claim 2, wherein,
When the first control signal, the second control signal and the third control are turned off, off and on, respectively;
the switching 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 out of operation.
8. A control method for a redundant backup constant-current-to-constant-voltage power supply circuit, which is applied to the redundant backup constant-current-to-constant-voltage power supply circuit as claimed in claims 1 to 7, and is characterized by comprising the following steps:
The first switch, the second switch and the third switch are controlled to be disconnected through the switch circuit, so that the master module and the slave module are connected into the system to work;
The micro MCU circuit obtains a current state signal of the master module and a current state signal of the slave module, and simultaneously obtains 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 condition of the first switch, the second switch and the third switch through the switch circuit based on the fault condition.
9. The method for controlling a redundant backup constant current to constant voltage power supply circuit according to claim 8,
The specific mode of judging the fault condition of the master module or the slave module according to the received signal and controlling the on-off condition 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, and if the current state signals of the master module are 1, the current state signals of the slave module are 1, the voltage state signals of the master module are 1, and the voltage state signals of the slave module are 1, the master module and the slave module have no faults, 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 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 1, the master module is in fault, the slave module works normally, and the first switch is controlled to be closed, the second switch is controlled to be opened, and the third switch is controlled to be opened 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 signals of the master module are 1, the current state signals of the slave module are 1, the voltage state signals of the master module are 1, and the voltage state signals of the slave module are 0, the master module is normal, the slave module is in fault, the system enters an independent master module working mode, and the first switch is controlled to be opened, the second switch is controlled to be closed, and the third switch is controlled to be opened through the switch circuit;
The micro MCU circuit acquires current state signals and voltage state signals of the master module and the slave module, and 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 are in failure, and the first switch is controlled to be opened, the second switch is controlled to be opened, and the third switch is controlled to be closed through the switch circuit.
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