Control circuit and control method of double-direct-current power supply and standby power system

Abstract

The invention discloses a control circuit of a double-direct-current power supply and standby power system. The control circuit comprises an LLC resonance circuit S1, an active clamping BOOST circuit S2 and a load. The control method comprises the following steps: 1, judging the working state of the LLC resonant circuit S1 through a threshold value V0; 2, sending a starting instruction of the LLC resonance circuit S1; 3, after the LLC resonant circuit S1 starts to be started for the first time as shown in the figure, when the output voltage of the LLC resonant circuit S1 reaches the stable voltage V2, the first starting state is ended; 4, the LLC resonance circuit S1 starts to work stably and normally, and the control system waits to receive a starting instruction of the active clamping BOOST circuit S2; 5, when the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, voltage compensation needs to be carried out; 6, starting the active clamping BOOST circuit S2 after reading the voltage compensation instruction; and 7, the control system judges the conditions that the LLC resonance circuit S1 is closed and the active clamping BOOST circuit S2 is opened. And the continuity and the stability of the circuit are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit switching, and in particular to a control circuit and a control method for a dual direct current power supply and backup power system. Background Art

[0002] At present, the market mainly uses cold backup systems for power switching. Once a fault occurs during operation, the system will shut down immediately, resulting in power outages at the power consumption site. When restoring power, power workers are often required to cooperate on site, which wastes engineering time and reduces user experience. In the existing power switching process, there are insufficient continuity and stability of the switching circuit, which also affects the efficiency of the site and brings the risk of insufficient circuit stability and reduced user experience. Once a power system fails in an unknown environment, its recovery cost is long and the efficiency is low, which has a serious impact on the business of power services, such as medical, communication and network services. Therefore, a new control circuit and control method for a dual DC power supply and backup power system has become an urgent problem that technicians in this field need to solve. Summary of the invention

[0003] The present application provides a control circuit of a dual DC power supply and backup power system, comprising: an LLC resonant circuit S1, an active clamping BOOST circuit S2 and a load, wherein the LLC resonant circuit S1 is connected to an input DC bus, and the input DC bus provides a bus voltage, so that the LLC resonant circuit S1 generates an output voltage connected to the load;

[0004] The input end of the active clamp BOOST circuit S2 is connected to a backup battery, the backup battery provides an input voltage of the active clamp BOOST circuit S2, and the output end of the active clamp BOOST circuit S2 is connected to the load;

[0005] The LLC resonant circuit S1 is a first access circuit for the load, and the active clamp BOOST circuit S2 is a second access circuit for the load;

[0006] Control system, used to send, receive and judge the status information of the circuit;

[0007] The LLC resonant circuit S1 is configured with a first signal output terminal, the first signal output terminal is connected to a control system, and the first signal output terminal is used to send a state instruction of the LLC resonant circuit S1;

[0008] The active BOOST circuit S2 is configured with a second signal output terminal, the second signal output terminal is connected to a control system, and the second signal output terminal is used to send a state instruction of the active BOOST circuit S2.

[0009] The present application also provides a switching method for a control circuit of a dual DC power supply and a backup power system, the switching method for a control circuit of a dual DC power supply and a backup power system is applied to the control circuit of the dual DC power supply and the backup power system, and the switching method for the control circuit of the dual DC power supply and the backup power system includes:

[0010] Step 1: Determine whether the voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V. If the input voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V, the LLC resonant circuit S1 is ready to start. When the input DC bus voltage stably reaches the reference voltage V, the LLC resonant circuit S1 enters soft start. When the LLC resonant circuit S1 outputs a stable voltage V2, the LLC resonant circuit S1 soft start is completed. At this time, the LLC resonant circuit S1 is started and operates normally.

[0011] If the input voltage of the DC bus is lower than or equal to the threshold V0, the LLC resonant circuit S1 does not start to work, and the active clamp BOOST circuit S2 does not start to work;

[0012] Step 2: After the LLC resonant circuit S1 is working stably, the control system determines whether the LLC resonant circuit S1 is powered off and shut down, and whether the active clamping BOOST circuit S2 is working normally. The control system reads the soft start instruction of the LLC resonant circuit S1 and then executes the first start task of the LLC resonant circuit S1. The control system continues to determine whether the active clamping BOOST circuit S2 is working normally.

[0013] Step 3: After the LLC resonant circuit S1 starts to be started for the first time as in step 2, the first start-up state ends when the output voltage of the LLC resonant circuit S1 reaches the stable voltage V2;

[0014] Step 4: The LLC resonant circuit S1 starts to work stably and normally, and sends a normal tooling status instruction of the LLC resonant circuit S1 to the control system. After receiving the instruction, the control system sends a start instruction of the active clamp BOOST circuit S2;

[0015] Step 5: During the execution process, when the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 sends a voltage compensation instruction to the control system;

[0016] Step 6: the active clamp BOOST circuit S2 reads the voltage compensation instruction in step 5 and then starts the active clamp BOOST circuit S2;

[0017] Step 7: The control system determines whether the following three situations occur, and the active clamp BOOST circuit S2 is turned on:

[0018] 1. When the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 continues to work and the active clamp BOOST circuit S2 starts;

[0019] 2. The interruption of the input DC bus voltage causes the LLC resonant circuit S1 to shut down, and the active clamp BOOST circuit S2 to start;

[0020] 3. When the output voltage of the LLC resonant circuit S1 is higher than the stable voltage V2, the LLC resonant circuit S1 is turned off and the active clamp BOOST circuit S2 is started;

[0021] When the control system receives any one of the above three state instructions, the control system sends an opening instruction to the active clamp BOOST circuit S2.

[0022] Optionally, in step 1, when the input voltage of the input DC bus is lower than the threshold V0, the method for judging whether the working state of the active clamping BOOST circuit S2 is a normal working state is:

[0023] After the LLC resonant circuit S1 is started up for the first time and works stably, the control system sends a hot backup state instruction, and the active clamping BOOST circuit S2 reads the hot backup state instruction and executes hot backup startup. When the voltage output by the LLC resonant circuit S1 is lower than the stable voltage V2, the active clamping BOOST circuit S2 performs voltage compensation on the LLC resonant circuit S1, and the LLC resonant circuit S1 continues to work until the load voltage returns to the stable voltage V2. When the LLC resonant circuit S1 returns to the stable voltage V2, the control system sends a stop instruction to the active clamping BOOST circuit S2, and the active clamping BOOST circuit S2 executes the stop instruction and stops working. The active clamping BOOST circuit S2 executes the shutdown of the PMW wave and clears the state machine.

[0024] Optionally, the clear state machine indicates that the parameters of the constant voltage loop and the current loop are restored to initialization settings.

[0025] Optionally, the soft start instruction of the LLC resonant circuit S1 sent to the control system in step 2 includes:

[0026] The LLC resonant circuit S1 is shut down;

[0027] When the LLC resonant circuit S1 is ready to clear the fault again, the active clamp BOOST circuit S2 works normally;

[0028] After the LLC resonant circuit S1 is started up and the output voltage remains stable, the active clamp BOOST circuit S2 is turned off.

[0029] Optionally, when the control system determines that the active clamp BOOST circuit S2 is working normally and the LLC resonant circuit S1 stops working, the state machine of the LLC resonant circuit S1 is cleared. Clearing the state machine of the LLC resonant circuit S1 means initializing the timer parameters, automatic reload values ​​and count values ​​of the LLC resonant circuit S1.

[0030] Optionally, the shutdown instruction sent by the control system in step 7 to the LLC resonant circuit S1 and the active clamp BOOST circuit S2 is:

[0031] The LLC resonant circuit S1 shuts down after a fault occurs;

[0032] The active clamp BOOST circuit S2 shuts down after a fault occurs.

[0033] The present application also provides a switching device for the control circuit of a dual DC power supply and backup power system, wherein the switching device for the control circuit of the dual DC power supply and backup power system comprises a memory and several processors, wherein the memory stores working status instructions, and the memory is interconnected with several processors respectively, and at least one processor calls the status instructions in the memory so that the switching device for the control circuit of the dual DC power supply and backup power system executes the switching method for the control circuit of the dual DC power supply and backup power system as described in any one of claims 2-9.

[0034] A computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, a switching method for a control circuit of a dual DC power supply and backup power system as described in any one of claims 2 to 9 is implemented.

[0035] The beneficial effects of this application are:

[0036] 1. Ensure the continuity and stability of power supply: In this application, there are two DC backup power supplies, namely, LLC resonant circuit S1 and active clamping BOOST circuit S2. When the LLC resonant circuit S1 is disturbed during operation and the voltage is unstable, the active clamping BOOST circuit S2 enters the hot start state in advance, and the voltage of the LLC resonant circuit S1 is quickly compensated, thereby ensuring the continuity and stability of the output voltage, which plays an important role in the key setting of uninterrupted power supply;

[0037] 2. Improve the reliability and redundancy of the system: This application increases the redundancy of the circuit by introducing two DC backup power supplies for hot backup, so that even if the system faces a single point failure, it can maintain normal operation by switching the backup circuit, thus improving the reliability of the entire circuit system

[0038] 3. Protect key equipment and data: This application avoids equipment damage. Sudden power outages or unstable power supply may cause damage to key equipment. The hot backup system can ensure that the load equipment can continue to obtain a stable power supply during the power supply switching process, thereby avoiding equipment damage caused by power supply problems. At the same time, it also ensures data security. In places such as data centers that require continuous power supply, power outages may cause data loss or damage. The hot backup system can ensure that during the power supply switching process, key equipment in the data center, such as network services and communication services, continue to operate, thereby ensuring data security and integrity;

[0039] 4. Improve user experience and satisfaction: This application reduces the number of service interruptions. For various services that rely on power supply, the hot backup system can ensure that the service will not be affected or will only be temporarily affected during the power supply switching process, thereby improving user experience and satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The utility model relates to a control circuit of a dual DC power supply and backup power system. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Please refer to Figure 1 As shown, the present application provides a control circuit of a dual DC power supply and backup power system, including: an LLC resonant circuit S1, an active clamp BOOST circuit S2 and a load, wherein the LLC resonant circuit S1 is connected to an input DC bus, and the input DC bus provides a bus voltage, so that the LLC resonant circuit S1 generates an output voltage connected to the load;

[0043] The input end of the active clamp BOOST circuit S2 is connected to a backup battery, the backup battery provides an input voltage of the active clamp BOOST circuit S2, and the output end of the active clamp BOOST circuit S2 is connected to the load;

[0044] The LLC resonant circuit S1 is a first access circuit for the load, and the active clamp BOOST circuit S2 is a second access circuit for the load;

[0045] Control system, used to send, receive and judge the status information of the circuit;

[0046] The LLC resonant circuit S1 is configured with a first signal output terminal, the first signal output terminal is connected to a control system, and the first signal output terminal is used to send a state instruction of the LLC resonant circuit S1;

[0047] The active BOOST circuit S2 is configured with a second signal output terminal, the second signal output terminal is connected to a control system, and the second signal output terminal is used to send a state instruction of the active BOOST circuit S2.

[0048] It should be noted that the LLC resonant circuit S1 is connected to the load, and the active clamping circuit S2 is also connected to the load. Both DC circuits supply power to the load. When the LLC resonant circuit S1 has an interference voltage instability or cannot work normally, the active clamping circuit S2 compensates the voltage and replaces the LLC resonant circuit S1 to supply power to the load. The LLC resonant circuit S1 and the active clamping circuit S2 can work simultaneously. After the LLC resonant circuit S1 works stably, the active clamping circuit S2 can be started at any time after hot backup. When the voltage of the active clamping circuit S2 is disturbed and unstable, the active clamping circuit S2 supplements the voltage. The two circuits run simultaneously, and the voltage can be adjusted in time to achieve the purpose of load voltage stability.

[0049] A method for switching a control circuit of a dual DC power supply and a backup power system is also provided. The method for switching a control circuit of a dual DC power supply and a backup power system is applied to the control circuit of the dual DC power supply and the backup power system. The method for switching a control circuit of the dual DC power supply and the backup power system includes:

[0050] Step 1: Determine whether the voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V. If the input voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V, the LLC resonant circuit S1 is ready to start. When the input DC bus voltage stably reaches the reference voltage V, the LLC resonant circuit S1 enters soft start. When the LLC resonant circuit S1 outputs a stable voltage V2, the LLC resonant circuit S1 soft start is completed. At this time, the LLC resonant circuit S1 is started and operates normally.

[0051] If the input voltage of the DC bus is lower than or equal to the threshold V0, the LLC resonant circuit S1 does not start to work, and the active clamp BOOST circuit S2 does not start to work;

[0052] In this embodiment, the threshold V0 is 320v, the reference voltage V is 400v, and the stable voltage V2 is 220v.

[0053] Step 2: After the LLC resonant circuit S1 is working stably, the control system determines whether the LLC resonant circuit S1 is powered off and shut down, and whether the active clamping BOOST circuit S2 is working normally. The control system reads the soft start instruction of the LLC resonant circuit S1 and then executes the first start task of the LLC resonant circuit S1. The control system continues to determine whether the active clamping BOOST circuit S2 is working normally.

[0054] Step 3: After the LLC resonant circuit S1 starts to be started for the first time as in step 2, the first start-up state ends when the output voltage of the LLC resonant circuit S1 reaches the stable voltage V2;

[0055] Step 4: The LLC resonant circuit S1 starts to work stably and normally, and sends a normal tooling status instruction of the LLC resonant circuit S1 to the control system. After receiving the instruction, the control system sends a start instruction of the active clamp BOOST circuit S2;

[0056] Step 5: During the execution process, when the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 sends a voltage compensation instruction to the control system;

[0057] Step 6: the active clamp BOOST circuit S2 reads the voltage compensation instruction in step 5 and then starts the active clamp BOOST circuit S2;

[0058] Step 7: The control system determines whether the following three situations occur, and the active clamp BOOST circuit S2 is turned on:

[0059] 1. When the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 continues to work and the active clamp BOOST circuit S2 starts;

[0060] 2. The interruption of the input DC bus voltage causes the LLC resonant circuit S1 to shut down, and the active clamp BOOST circuit S2 to start;

[0061] 3. When the output voltage of the LLC resonant circuit S1 is higher than the stable voltage V2, the LLC resonant circuit S1 is turned off and the active clamp BOOST circuit S2 is started;

[0062] When the control system receives any one of the above three state instructions, the control system sends an opening instruction to the active clamp BOOST circuit S2.

[0063] It should be noted that in the present application, the load voltage is ensured to be output stably, or at least not lower than the load working voltage, by switching between the LLC resonant circuit S1 and the active clamping BOOST circuit S2. When any disturbance occurs in the LLC resonant circuit S1 and its output voltage is reduced, an external circuit is required to perform voltage compensation on the load. For example, after the 220V DC output voltage is stable, the active clamping voltage S2 is started for hot backup. When the output voltage of the LLC resonant circuit S1 is reduced to within the range of 10V to 15V, the control system receives the hot start instruction sent by the LLC resonant circuit S1 and allows the active clamping BOOST circuit S2 to start. After that, the active clamping BOOST circuit S2 can be started at any time to ensure that the load voltage amplitude is normal and the power supply is continuous. When the active clamping BOOST circuit S2 is the main power supply circuit, the LLC resonant circuit S1 enters the shutdown state, waiting for the next operation, and the state machine clears the operation after each circuit switching, waiting for the next startup condition.

[0064] In the step 1, when the input voltage of the input DC bus is lower than the threshold V0, the method for judging whether the working state of the active clamping BOOST circuit S2 is a normal working state is:

[0065] After the LLC resonant circuit S1 is started up for the first time and works stably, the control system sends a hot backup state instruction, and the active clamping BOOST circuit S2 reads the hot backup state instruction and executes hot backup startup. When the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the active clamping BOOST circuit S2 performs voltage compensation on the LLC resonant circuit S1, and the LLC resonant circuit S1 continues to work until the load voltage returns to the stable voltage V2. When the LLC resonant circuit S1 returns to the stable voltage V2, the control system sends a stop instruction to the active clamping BOOST circuit S2, and the active clamping BOOST circuit S2 executes the stop instruction and stops working. The active clamping BOOST circuit S2 executes the shutdown of the PMW wave and clears the state machine.

[0066] The clear state machine indicates that the parameters of the constant voltage loop and the current loop are restored to the initialization settings.

[0067] The soft start instruction of the LLC resonant circuit S1 sent to the control system in step 2 includes:

[0068] The LLC resonant circuit S1 is shut down;

[0069] When the LLC resonant circuit S1 is ready to clear the fault again, the active clamp BOOST circuit S2 works normally;

[0070] After the LLC resonant circuit S1 is started up and the output voltage remains stable, the active clamp BOOST circuit S2 is turned off.

[0071] When the control system determines that the active clamp BOOST circuit S2 is working normally and the LLC resonant circuit S1 stops working, the state machine of the LLC resonant circuit S1 is cleared. Clearing the state machine of the LLC resonant circuit S1 means initializing the timer parameters, automatic reload values ​​and count values ​​of the LLC resonant circuit S1.

[0072] The shutdown command sent by the control system in step 7 to the LLC resonant circuit S1 and the active clamp BOOST circuit S2 is:

[0073] The LLC resonant circuit S1 shuts down after a fault occurs;

[0074] The active clamp BOOST circuit S2 shuts down after a fault occurs.

[0075] The fault of the LLC resonant circuit S1 is specifically a situation where a hardware device on the LLC resonant circuit S1 is damaged;

[0076] The active clamping BOOST circuit S2 may fail because the active clamping BOOST circuit S2 is damaged, or the backup battery is disconnected from the active clamping BOOST circuit S2.

[0077] The present application also provides a switching device for the control circuit of a dual DC power supply and backup power system. The switching device for the control circuit of the dual DC power supply and backup power system includes a memory and several processors. The memory stores working status instructions, and the memory is interconnected with several processors respectively. At least one processor calls the status instructions in the memory, so that the switching device for the control circuit of the dual DC power supply and backup power system executes the switching method of the control circuit of the dual DC power supply and backup power system.

[0078] A computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the switching method of the control circuit of the dual DC power supply and backup power system is implemented.

[0079] It is worth noting that dual-circuit switching is performed in this application. When the LLC resonant circuit S1 fails, the active clamping BOOST circuit S2 is started for hot backup to avoid voltage fluctuations at the load end and negative effects on load stability. The two circuits switch working states according to the working conditions. When shutting down the own circuit, the state machine needs to be cleared to facilitate the next startup to enter the normal working state, while avoiding the uncertainty of the working state or frequent protection introduced by frequent startup of the circuit.

[0080] The hot backup of the circuit in the present application can quickly switch the load to the active clamping BOOST circuit S2 when the LLC resonant circuit S1 fails, thereby ensuring the continuity of the output. This instant replacement capability is particularly important for critical facilities that require uninterrupted power supply. Compared with cold backup, the backup equipment or circuit of hot backup is already in a preheating or standby state, so the switching process is faster, which can greatly reduce the downtime caused by power outages. By introducing hot backup, the circuit increases redundancy. This redundant design allows the system to maintain normal operation by switching the backup circuit even in the face of a single point failure, thereby improving the reliability of the entire system.

[0081] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A control circuit for a dual DC power supply and backup power system, characterized in that: include: LLC resonant circuit S1, active clamp BOOST circuit S2 and load, the LLC resonant circuit S1 is connected to an input DC bus, the input DC bus provides a bus voltage, so that the LLC resonant circuit S1 generates an output voltage connected to the load; The input end of the active clamp BOOST circuit S2 is connected to a backup battery, the backup battery provides an input voltage of the active clamp BOOST circuit S2, and the output end of the active clamp BOOST circuit S2 is connected to the load; The LLC resonant circuit S1 is a first access circuit for the load, and the active clamp BOOST circuit S2 is a second access circuit for the load; Control system, used to send, receive and judge the status information of the circuit; The LLC resonant circuit S1 is configured with a first signal output terminal, the first signal output terminal is connected to a control system, and the first signal output terminal is used to send a state instruction of the LLC resonant circuit S1; The active BOOST circuit S2 is configured with a second signal output terminal, the second signal output terminal is connected to a control system, and the second signal output terminal is used to send a state instruction of the active BOOST circuit S2.

2. A method for switching a control circuit of a dual DC power supply and backup power system, characterized in that: The switching method of the control circuit of the dual DC power supply and backup power system is applied to the control circuit of the dual DC power supply and backup power system, and the switching method of the control circuit of the dual DC power supply and backup power system includes: Step 1: Determine whether the voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V. If the input voltage of the input DC bus is higher than the threshold value V0 and lower than the reference voltage V, the LLC resonant circuit S1 is ready to start. When the input DC bus voltage stably reaches the reference voltage V, the LLC resonant circuit S1 enters soft start. When the LLC resonant circuit S1 outputs a stable voltage V2, the LLC resonant circuit S1 soft start is completed. At this time, the LLC resonant circuit S1 is started and operates normally. If the input voltage of the DC bus is lower than or equal to the threshold V0, the LLC resonant circuit S1 does not start to work, and the active clamp BOOST circuit S2 does not start to work; Step 2: After the LLC resonant circuit S1 is working stably, the control system determines whether the LLC resonant circuit S1 is powered off and shut down, and whether the active clamping BOOST circuit S2 is working normally. The control system reads the soft start instruction of the LLC resonant circuit S1 and then executes the first start task of the LLC resonant circuit S1. The control system continues to determine whether the active clamping BOOST circuit S2 is working normally. Step 3: After the LLC resonant circuit S1 starts to be started for the first time as in step 2, the first start-up state ends when the output voltage of the LLC resonant circuit S1 reaches the stable voltage V2; Step 4: The LLC resonant circuit S1 starts to work stably and normally, and sends a normal tooling status instruction of the LLC resonant circuit S1 to the control system. After receiving the instruction, the control system sends a start instruction of the active clamp BOOST circuit S2; Step 5: During the execution process, when the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 sends a voltage compensation instruction to the control system; Step 6: the active clamp BOOST circuit S2 reads the voltage compensation instruction in step 5 and then starts the active clamp BOOST circuit S2; Step 7: The control system determines whether the following three situations occur, and the active clamp BOOST circuit S2 is turned on:

1. When the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the LLC resonant circuit S1 continues to work and the active clamp BOOST circuit S2 starts; 2. The interruption of the input DC bus voltage causes the LLC resonant circuit S1 to shut down, and the active clamp BOOST circuit S2 to start; 3. When the output voltage of the LLC resonant circuit S1 is higher than the stable voltage V2, the LLC resonant circuit S1 is turned off and the active clamp BOOST circuit S2 is started; When the control system receives any one of the above three state instructions, the control system sends an opening instruction to the active clamp BOOST circuit S2.

3. A method for switching a control circuit of a dual DC power supply and backup power system according to claim 2, characterized in that: In the step 1, when the input voltage of the input DC bus is lower than the threshold V0, the method for judging whether the working state of the active clamping BOOST circuit S2 is a normal working state is: After the LLC resonant circuit S1 is started up for the first time and works stably, the control system sends a hot backup state instruction, and the active clamping BOOST circuit S2 reads the hot backup state instruction and executes hot backup startup. When the output voltage of the LLC resonant circuit S1 is lower than the stable voltage V2, the active clamping BOOST circuit S2 performs voltage compensation on the LLC resonant circuit S1, and the LLC resonant circuit S1 continues to work until the load voltage returns to the stable voltage V2. When the LLC resonant circuit S1 returns to the stable voltage V2, the control system sends a stop instruction to the active clamping BOOST circuit S2, and the active clamping BOOST circuit S2 executes the stop instruction and stops working. The active clamping BOOST circuit S2 executes the shutdown of the PMW wave and clears the state machine.

4. A method for switching a control circuit of a dual DC power supply and backup power system according to claim 3, characterized in that: The clear state machine indicates that the parameters of the constant voltage loop and the current loop are restored to the initialization settings.

5. A method for switching a control circuit of a dual DC power supply and backup power system according to claim 4, characterized in that: The soft start instruction of the LLC resonant circuit S1 sent to the control system in step 2 includes: The LLC resonant circuit S1 is shut down; When the LLC resonant circuit S1 is ready to clear the fault again, the active clamp BOOST circuit S2 works normally; After the LLC resonant circuit S1 is started up and the output voltage remains stable, the active clamp BOOST circuit S2 is turned off.

6. A method for switching a control circuit of a dual DC power supply and backup power system according to claim 5, characterized in that: When the control system determines that the active clamp BOOST circuit S2 is working normally and the LLC resonant circuit S1 stops working, the state machine of the LLC resonant circuit S1 is cleared. Clearing the state machine of the LLC resonant circuit S1 means initializing the timer parameters, automatic reload values ​​and count values ​​of the LLC resonant circuit S1.

7. A method for switching a control circuit of a dual DC power supply and backup power system according to claim 6, characterized in that: The shutdown command sent by the control system in step 7 to the LLC resonant circuit S1 and the active clamp BOOST circuit S2 is: The LLC resonant circuit S1 shuts down after a fault occurs; The active clamp BOOST circuit S2 shuts down after a fault occurs.

8. A switching device for a control circuit of a dual DC power supply and backup power system, characterized in that: The switching device of the control circuit of the dual DC power supply and backup power system includes a memory and several processors, the memory stores working status instructions, and the memory is interconnected with several processors respectively, and at least one processor calls the status instructions in the memory so that the switching device of the control circuit of the dual DC power supply and backup power system executes the switching method of the control circuit of the dual DC power supply and backup power system as described in any one of claims 2-7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the switching method of the control circuit of the dual DC power supply and backup power system according to any one of claims 2 to 7 is implemented.

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