Redundant power supply system based on double-track resonance and control method thereof

Abstract

The invention discloses a redundant power supply system based on double-track resonance and a control method thereof, and relates to the technical field of power supply circuit design. The double-track resonance circuit comprises a first track and a second track which are parallel, an external power supply is respectively connected to the input ends of the two parallel tracks and is output to supply power after passing through the inversion plates, the contactor group and the resonance circuit which are sequentially connected in the tracks, the two inversion plates are connected to synchronize signals, and the two tracks are connected through the other contactor group; wherein each contactor group comprises two parallel contactors, and every two contactors are in hardware linkage; the control panel is electrically connected with the double-track resonance circuit and used for collecting current and voltage signals in the double-track resonance circuit in real time, conducting fault judgment according to the collected signals and controlling on-off of a contactor in the double-track resonance circuit according to a fault judgment result. Reliable operation of the power supply system can be realized, and the reliability and redundancy of the system are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuit design, and in particular to a redundant power supply system based on dual-rail resonance and its control method. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] A power supply system refers to a system that generates electrical energy and supplies and transmits it to electrical equipment, consisting of a power supply system and a power transmission and distribution system. Traditional power supply systems usually use a variety of key components such as inverter boards, control boards, inductors, capacitors, etc., and design corresponding resonance circuits and control circuits, etc. to transfer electrical energy to the load end to achieve power supply.

[0004] However, the resonance circuits, control circuits, etc. designed based on key components in existing power supply systems have limitations, such that when a key component fails, it may cause the entire system to collapse. For example, existing systems have a strong dependence on a single resonance circuit and have a high risk of single-point failure: when a component in the circuit is damaged or the parameters are mismatched, the entire system will not be able to operate normally. Summary of the Invention

[0005] To solve the above deficiencies of the prior art, the present invention provides a redundant power supply system based on dual-rail resonance and its control method. On the basis of the traditional power supply system design, a redundancy design is introduced. By designing a dual-rail resonance circuit based on dual-inverter boards, a hardware interlock mechanism, resonance redundancy control, and a master-slave redundancy switching strategy, the reliable operation of the power supply system is realized, the reliability and redundancy of the system are effectively improved, and the problem of single-point failure risk in the resonance circuit of the traditional power supply system is solved.

[0006] In the first aspect, the present invention provides a redundant power supply system based on dual-rail resonance.

[0007] A redundant power supply system based on dual-rail resonance includes a dual-rail resonance circuit and a control board;

[0008] The dual-rail resonance circuit includes a parallel first track and a second track. An external power supply is respectively connected to the input ends of the two parallel tracks, and after passing through the inverter boards, contactor groups, and resonance circuits connected in sequence in the tracks, it outputs to supply power. The two inverter boards are connected with a synchronization signal, and the two tracks are connected through another contactor group; wherein, each contactor group includes two parallel contactors, and there is a hardware interlock between every two contactors;

[0009] The control board is electrically connected to the dual-rail resonance circuit, and is used for real-time collecting current and voltage signals in the dual-rail resonance circuit, making a fault judgment according to the collected signals, and controlling the on-off of the contactors in the dual-rail resonance circuit according to the fault judgment result.

[0010] For a further technical solution, the first contactor group in the first track includes a first contactor and a second contactor connected in parallel, the second contactor group in the second track includes a third contactor and a fourth contactor connected in parallel, and the two tracks are connected by a fifth contactor and a sixth contactor connected in parallel;

[0011] Among them, the first contactor and the second contactor are hardware interlocked, and when the second contactor is disconnected, the first contactor is forced to disconnect;

[0012] The third contactor and the fourth contactor are hardware interlocked, and when the third contactor is disconnected, the fourth contactor is forced to disconnect;

[0013] The second contactor and the sixth contactor are hardware interlocked, and the sixth contactor is only energized when the second contactor is disconnected;

[0014] The third contactor and the fifth contactor are hardware interlocked, and the fifth contactor is only energized when the third contactor is disconnected.

[0015] For a further technical solution, the normal operating state of the double-track resonant circuit is as follows:

[0016] When the first inverter board passes the self-check after being powered on and the second inverter board is detected to be normal, the first contactor and the third contactor are energized, and the fifth contactor is disconnected, and the rest of the contactors are all disconnected;

[0017] When the second inverter board passes the self-check after being powered on and the first inverter board is detected to be normal, the second contactor and the fourth contactor are energized, and the sixth contactor is disconnected, and the rest of the contactors are all disconnected.

[0018] For a further technical solution, the control board is electrically connected to the double-track resonant circuit and is used to collect the inverter current signal in the double-track resonant circuit in real time and perform fault judgment according to the collected inverter current signal, including:

[0019] When any characteristic value of the amplitude, phase, and frequency of the collected inverter current exceeds the set threshold range, it is determined that there is an abnormality and a fault in the current track resonant circuit.

[0020] For a further technical solution, the control board is electrically connected to the double-track resonant circuit and is used to control the on and off of the contactors in the double-track resonant circuit according to the fault judgment result, including:

[0021] The faults include two fault states: the first inverter board fault and the second inverter board fault;

[0022] When it is determined to be in the first fault state of the first inverter board fault, the second contactor is controlled to disconnect, at this time, the interlock is triggered to disconnect the first contactor, and the sixth contactor is energized, so that the first resonant circuit is taken over by the second inverter board;

[0023] When it is determined to be in the second fault state of the second inverter board, control the third contactor to disconnect. At this time, trigger the interlock to disconnect the fourth contactor and engage the fifth contactor, so that the second resonant circuit is taken over by the first inverter board.

[0024] A further technical solution is that the system includes two control boards with parallel functions, and data is exchanged and shared between the two control boards through a CAN bus and optical fiber.

[0025] When both control boards are in normal operation, randomly select and assign master and slave roles to determine the master control board and the slave control board, and the master and slave roles are dynamically switched between the two control boards at any time.

[0026] When a certain control board is in abnormal operation, the other control board takes over the control of the dual-rail resonant circuit in real time.

[0027] In a second aspect, the present invention provides a control method for a redundant power supply system based on dual-rail resonance.

[0028] A control method for a redundant power supply system based on dual-rail resonance proposed in the first aspect, including:

[0029] Real-time collect the current and voltage signals in the dual-rail resonant circuit, and perform fault judgment based on the collected signals; the faults include two fault states of the first inverter board fault and the second inverter board fault.

[0030] According to the fault judgment result, control the on and off of the contactors in the dual-rail resonant circuit.

[0031] The above one or more technical solutions have the following beneficial effects:

[0032] 1. The present invention proposes a redundant power supply system based on dual-rail resonance and its control method. On the basis of the traditional power supply system design, a redundant design is introduced. By designing a dual-rail resonant circuit based on dual inverter boards, a hardware interlock mechanism, resonant redundancy control, and master-slave redundancy switching strategy, the reliable operation of the power supply system is realized, effectively improving the reliability and redundancy of the system, and solving the problem of the risk of single-point failure in the resonant circuit of the traditional power supply system.

[0033] 2. In the system proposed by the present invention, the reliability and redundancy of the system are achieved through dual-track design and resonant redundancy control; the hardware interlock is realized by using the auxiliary contacts of the intermediate relay, which can improve the flexibility and reliability of control; the dynamic role switching of the master and slave boards is designed to ensure the stable operation of the system. The dynamic role switching mechanism of the master and slave boards takes over the resonant circuit in case of system failure, realizing the automatic takeover function in the fault state and ensuring the stable and reliable operation of the system. The system proposed by the present invention has the characteristics of dual-track design, redundancy control, dynamic role switching, auxiliary contacts of intermediate relay and fault handling mechanism, and can provide reliable and efficient control solutions for fields such as industrial control, power systems and traffic control systems.

[0034] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0036] Figure 1 It is a schematic diagram of the redundant power supply system based on dual-track resonance in an embodiment of the present invention; wherein, the dual-track resonance circuit is a dual-track double resonance circuit;

[0037] Figure 2 It is a schematic diagram of the dynamic master-slave switching of two control boards in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the redundant power supply system based on dual-track resonance in an embodiment of the present invention; wherein, the dual-track resonance circuit is a dual-track single resonance circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] It should be noted that the following detailed description is exemplary only and is for the purpose of describing specific embodiments, aiming to provide further explanation of the present invention and not intended to limit the exemplary embodiments according to the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Embodiment 1

[0041] This embodiment provides a redundant power supply system based on dual-rail resonance. A dual-rail resonance circuit is designed, in which a dual-inverter board controls a contactor group in a decentralized manner, and an intermediate relay is used to assist the contactor contacts in the contactor group to achieve hardware interlocking; a dual-control board is designed, and the dual-control board can switch the master-slave dynamic roles, and when a fault occurs, the non-fault control board takes over the resonance circuit to ensure the continuous operation of the system. Through the above redundant design, this embodiment can significantly improve the fault tolerance and operation stability of the power supply system, and is applicable to power electronic devices with high reliability requirements.

[0042] As Figure 1 shown, the redundant power supply system based on dual-rail resonance proposed in this embodiment includes a dual-rail resonance circuit and a control board. Specifically, the dual-rail resonance circuit includes a parallel first track and a second track. An external power supply is respectively connected to the input ends of the two parallel tracks, and after passing through the inverter board, contactor group and resonance circuit connected in sequence in the track, the power is output for power supply. Among them, the inverter board is an inverter PCB board, which is a specially designed PCB circuit board for the inverter. The inverter is an electronic device that can convert DC electrical energy into AC electrical energy. In this embodiment, the full-bridge structure shown in Figure 1 is used to implement. On this basis, the two inverter boards are connected with a synchronization signal, and the two tracks are connected through another contactor group; among them, each contactor group includes two parallel contactors, and there is hardware interlocking between the two contactors.

[0043] Specifically, the first contactor group in the first track includes a first contactor KM1 and a second contactor KM2 connected in parallel, and the second contactor group in the second track includes a third contactor KM3 and a fourth contactor KM4 connected in parallel. The two tracks are connected through a fifth contactor KM5 and a sixth contactor KM6 connected in parallel. By making the contactors all adopt a redundant design scheme, it is possible to prevent the situation that the contactors are always attracted or always disconnected due to the control board crashing, resulting in ineffective switching.

[0044] Among them, the first contactor KM1 and the second contactor KM2 are hardware-interlocked, and when the second contactor KM2 is disconnected, the first contactor KM1 is forced to disconnect; the third contactor KM3 and the fourth contactor KM4 are hardware-interlocked, and when the third contactor KM3 is disconnected, the fourth contactor KM4 is forced to disconnect; the second contactor KM2 and the sixth contactor KM6 are hardware-interlocked, and the sixth contactor KM6 is only attracted when the second contactor KM2 is disconnected; the third contactor KM3 and the fifth contactor KM5 are hardware-interlocked, and the fifth contactor KM5 is only attracted when the third contactor KM3 is disconnected. Preferably, the above hardware interlock can be realized through the auxiliary contacts of the intermediate relay.

[0045] The normal operating state of the above dual-rail resonance circuit is as follows:

[0046] When the first inverter board INV1 passes the self-check after being powered on and the second inverter board INV2 is detected to be normal, the first contactor KM1 and the third contactor KM3 are closed, and the fifth contactor KM5 is opened, and the rest of the contactors are opened;

[0047] Or, when the second inverter board INV2 passes the self-check after being powered on and the first inverter board INV1 is detected to be normal, the second contactor KM2 and the fourth contactor KM4 are closed, and the sixth contactor KM6 is opened, and the rest of the contactors are opened.

[0048] In the normal operating state of the double-track resonant circuit, the power supply system can achieve stable power supply. Preferably, in the above double-track resonant circuit, the two resonant circuits are connected in parallel to form a double-resonant circuit, or the two resonant circuits can also be connected in series to form a single-resonant circuit. That is, the redundant power supply system proposed in this embodiment can not only be effectively applied to the double-track double-resonant circuit, but also be adapted to the double-track single-resonant circuit as shown in Figure 3 It has extremely high flexibility and a wide range of application scenarios, has good scalability and compatibility, and can flexibly adjust the control strategy and hardware configuration according to actual needs to meet the customized needs of different application scenarios.

[0049] Furthermore, a control board is designed in the above system of this embodiment. The control board is electrically connected to the double-track resonant circuit, and is used to collect the current and voltage signals in the double-track resonant circuit in real time, perform fault judgment according to the collected signals, and control the on and off of the contactors in the double-track resonant circuit according to the fault judgment results.

[0050] Specifically, the control board collects the inverter current signal in the double-track resonant circuit in real time, performs fault judgment according to the collected inverter current signal. When the amplitude, phase, and frequency of the collected inverter current exceed the set threshold, it is determined that there is an abnormality or a fault in the current track resonant circuit, and the current fault state can be determined accordingly. Taking the amplitude of the inverter current as an example, when the effective value or peak value of the inverter current exceeds the rated value, there may be abnormal situations such as load short circuit, resonant capacitor failure (capacity reduction), and inductor saturation. At this time, it is determined that there is a fault; when the inverter current is significantly lower than the normal value, there may be abnormal situations such as load open circuit, capacitor capacity increase, and inductor open circuit. At this time, it is determined that there is a fault. Furthermore, according to the above judgment, the fault can be divided into two fault states: the first inverter board fault and the second inverter board fault.

[0051] After determining the fault state in the double-track resonant circuit, the control board executes the fault takeover strategy and controls the on and off of the contactors in the double-track resonant circuit according to the fault judgment results, including:

[0052] The faults include two fault states: the first inverter board fault and the second inverter board fault;

[0053] When it is determined to be in the first fault state of the first inverter board, control the second contactor to disconnect. At this time, trigger the interlock to disconnect the first contactor and close the sixth contactor, so that the first resonant circuit is taken over by the second inverter board;

[0054] When it is determined to be in the second fault state of the second inverter board, control the third contactor to disconnect. At this time, trigger the interlock to disconnect the fourth contactor and close the fifth contactor, so that the second resonant circuit is taken over by the first inverter board, realizing single-inverter operation of the double-resonant circuit.

[0055] As another implementation, as Figure 2 shown, the above system includes two control boards with parallel functions, namely CPU1 and CPU2. Both control boards are connected to the DC power supply and powered by the DC power supply. And data is exchanged and shared between the two control boards through the CAN bus and optical fiber. When working, both CPU1 and CPU2 collect double-inverter current and double-rail current, and status information such as phase and fault can be transmitted in real time between the two boards. By collecting data redundantly, information synchronization can be ensured.

[0056] Specifically, when both control boards are in normal operation, randomly select and assign master and slave roles to determine the master control board and the slave control board, and the master and slave roles can be dynamically switched between the two control boards at any time; when a certain control board is in an abnormal operation state such as a fault or disconnection, the other control board takes over the control of the double-rail resonant circuit in real time and reports the fault.

[0057] Among them, data sharing and interaction are carried out between the two control boards. The current, voltage, temperature and power-on status signals of itself are sent to the other control board at a set frequency. The control board judges whether the other control board is disconnected according to the feedback power-on status signal, and judges whether the other control board is in a normal operation state according to whether the current, voltage and temperature are within the set threshold range.

[0058] Through the above dynamic allocation of master and slave roles, combined with redundant data acquisition, seamless transfer of control rights can be achieved, and the signals of the two inverter boards are synchronized. The loop switching does not affect the original resonant state, and the inverter voltage and current still remain in the same phase, and the ZVS (zero-voltage switching) working state can be maintained.

[0059] This embodiment can effectively eliminate the risk of single-point faults in the system by adopting hardware interlock and redundant control technologies, ensuring that the loop switching process can be completed quickly and reliably when a fault occurs. This solution can be widely used in key fields such as new energy power generation, industrial power supplies, and electric vehicle charging, and can significantly improve the robustness and operation and maintenance efficiency of the system.

[0060] Embodiment 2

[0061] This embodiment provides a control method for a redundant power supply system based on dual-rail resonance, which realizes the control of the redundant power supply system based on dual-rail resonance proposed in Embodiment 1. The method includes:

[0062] Collect the current and voltage signals in the dual-rail resonance circuit in real time, and perform fault judgment based on the collected signals. Among them, the faults include two fault states: the first inverter board fault and the second inverter board fault.

[0063] Control the on and off of the contactors in the dual-rail resonance circuit according to the fault judgment result.

[0064] Furthermore, the normal operating state of the above-mentioned dual-rail resonance circuit is as follows:

[0065] When the first inverter board passes the self-check after being powered on and the second inverter board is detected to be normal, the first contactor and the third contactor are closed, and the fifth contactor is opened, and the rest of the contactors are all opened.

[0066] When the second inverter board passes the self-check after being powered on and the first inverter board is detected to be normal, the second contactor and the fourth contactor are closed, and the sixth contactor is opened, and the rest of the contactors are all opened.

[0067] When the dual-rail resonance circuit operates abnormally, control the on and off of the contactors in the dual-rail resonance circuit according to the fault judgment result, including:

[0068] When it is judged as the first fault state of the first inverter board fault, control the second contactor to be opened. At this time, the interlock is triggered to open the first contactor, and the sixth contactor is closed, so that the first resonance circuit is taken over by the second inverter board.

[0069] When it is judged as the second fault state of the second inverter board fault, control the third contactor to be opened. At this time, the interlock is triggered to open the fourth contactor, and the fifth contactor is closed, so that the second resonance circuit is taken over by the first inverter board.

[0070] Each step involved in the above Embodiment 2 corresponds to that in Embodiment 1. For the specific implementation manner, reference can be made to the relevant description part of Embodiment 1, which will not be elaborated here.

[0071] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computer device. Optionally, they can be implemented by program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be separately made into individual integrated circuit modules, or multiple modules or steps among them can be made into a single integrated circuit module to implement. The present invention is not limited to any specific combination of hardware and software.

[0072] The above are only the preferred embodiments of the present invention. Although the specific implementation manners of the present invention are described in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A redundant power supply system based on dual-rail resonance, characterized in that, It includes a double - track resonant circuit and a control board; The double - track resonant circuit includes a parallel first track and a second track. An external power supply is respectively connected to the input ends of the two parallel tracks. After passing through an inverter board, a contactor group and a resonant circuit connected in sequence in the tracks, it outputs power. The two inverter boards are connected with a synchronization signal, and the two tracks are connected through another contactor group; wherein, each contactor group includes two parallel contactors, and there is a hardware interlock between every two contactors; The control board is electrically connected to the double - track resonant circuit, and is used for real - time collecting the current and voltage signals in the double - track resonant circuit, making a fault judgment according to the collected signals, and controlling the on - off of the contactors in the double - track resonant circuit according to the fault judgment result.

2. The redundant power supply system based on dual-rail resonance according to claim 1, characterized in that The first contactor group in the first track includes a first contactor and a second contactor connected in parallel. The second contactor group in the second track includes a third contactor and a fourth contactor connected in parallel. The two tracks are connected through a fifth contactor and a sixth contactor connected in parallel; Among them, the first contactor and the second contactor are hardware - interlocked. When the second contactor is disconnected, the first contactor is forced to disconnect; The third contactor and the fourth contactor are hardware - interlocked. When the third contactor is disconnected, the fourth contactor is forced to disconnect; The second contactor and the sixth contactor are hardware - interlocked. The sixth contactor only closes when the second contactor is disconnected; The third contactor and the fifth contactor are hardware - interlocked. The fifth contactor only closes when the third contactor is disconnected.

3. The redundant power supply system based on dual-rail resonance according to claim 2, wherein The normal operation state of the double - track resonant circuit is as follows: When the first inverter board is powered on and self - checks normally, and the second inverter board is detected to be normal, the first contactor and the third contactor are closed, and the fifth contactor is disconnected, and the rest of the contactors are all disconnected; When the second inverter board is powered on and self - checks normally, and the first inverter board is detected to be normal, the second contactor and the fourth contactor are closed, and the sixth contactor is disconnected, and the rest of the contactors are all disconnected.

4. The redundant power supply system based on dual-rail resonance according to claim 3, wherein The control board is electrically connected to the double - track resonant circuit, and is used for real - time collecting the inverter current signal in the double - track resonant circuit, and making a fault judgment according to the collected inverter current signal, including: When any one of the characteristic values of the amplitude, phase, and frequency of the collected inverter current exceeds the set threshold range, it is determined that there is an abnormality and a fault in the current track resonant circuit.

5. The redundant power supply system based on dual-rail resonance according to claim 3, characterized in that, The control board is electrically connected to the double - track resonant circuit, and is used for controlling the on - off of the contactors in the double - track resonant circuit according to the fault judgment result, including: The faults include two fault states: the first inverter board fault and the second inverter board fault; When it is judged as the first fault state of the first inverter board fault, control the second contactor to disconnect. At this time, the first contactor is triggered to disconnect by the interlock, and the sixth contactor is closed, so that the first resonant circuit is taken over by the second inverter board; When it is judged as the second fault state of the second inverter board fault, control the third contactor to disconnect. At this time, the fourth contactor is triggered to disconnect by the interlock, and the fifth contactor is closed, so that the second resonant circuit is taken over by the first inverter board.

6. The redundant power supply system based on dual-rail resonance according to claim 1, characterized in that, The system includes two control boards with parallel functions. The two control boards exchange and share data through the CAN bus and optical fiber. When both control boards are in normal operating states, the master and slave roles are randomly selected and assigned to determine the master control board and the slave control board, and the master and slave roles are dynamically switched between the two control boards at any time; When a certain control board is in an abnormal operating state, the other control board takes over the control of the dual-rail resonant circuit in real time.

7. The redundant power supply system based on dual-track resonance according to claim 1, wherein In the dual-rail resonant circuit, two resonant circuits are connected in parallel to form a double resonant circuit, or two resonant circuits are connected in series to form a single resonant circuit.

8. A control method for a redundant power supply system based on dual-rail resonance according to any one of claims 1-7, characterized in that, It includes: Collect the current and voltage signals in the dual-rail resonant circuit in real time, and perform fault judgment according to the collected signals; the faults include two fault states of the first inverter board fault and the second inverter board fault; Control the on and off of the contactors in the dual-rail resonant circuit according to the fault judgment result.

9. The control method of the redundant power supply system based on dual-rail resonance according to claim 8, wherein, The normal operating state of the dual-rail resonant circuit is: When the first inverter board passes the self-check after being powered on and the second inverter board is detected to be normal, the first contactor and the third contactor are closed, and the fifth contactor is opened, and the rest of the contactors are opened; When the second inverter board passes the self-check after being powered on and the first inverter board is detected to be normal, the second contactor and the fourth contactor are closed, and the sixth contactor is opened, and the rest of the contactors are opened.

10. The control method of the redundant power supply system based on double-track resonance according to claim 9, characterized in that, Controlling the on and off of the contactors in the dual-rail resonant circuit according to the fault judgment result includes: When it is judged as the first fault state of the first inverter board fault, control to open the second contactor. At this time, the interlock is triggered to open the first contactor, and the sixth contactor is closed, so that the first resonant circuit is taken over by the second inverter board; When it is judged as the second fault state of the second inverter board fault, control to open the third contactor. At this time, the interlock is triggered to open the fourth contactor, and the fifth contactor is closed, so that the second resonant circuit is taken over by the first inverter board.

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