Power supply circuit, control method thereof, power supply device and power supply system

Abstract

The application provides a power supply circuit, a control method thereof, a power supply device and a power supply system. The power supply circuit comprises a first power conversion circuit, a second power conversion circuit and a switching circuit. The first power conversion circuit is configured to receive a first input voltage provided by a first input power supply through a first input terminal, and convert the first input voltage into a second output voltage. The second power conversion circuit is configured to receive a second input voltage provided by a second input power supply through a second input terminal, and convert the second input voltage into the second output voltage, thereby providing a stable voltage for a load. The switching circuit is configured to turn on or turn off the electrical connection between the first input terminal and the second input terminal. In the case that the electrical connection between the first input power supply and the first power conversion circuit is turned off, the switching circuit is configured to turn on the electrical connection between the first input terminal and the second input terminal. The service life of the first input power supply and the second input power supply is relatively long, and the power density of the power supply circuit is relatively high.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply circuit and its control method, power supply equipment and power supply system. Background Technology

[0002] The operation of power supply equipment requires a power supply system. This system processes the current to provide a stable voltage, thus maintaining the stable operation of the equipment. Some power supply equipment needs to operate continuously without power interruption; therefore, the power supply system must have the capability for continuous power supply. Typically, a power supply system includes multiple input power sources. When one of these input power sources fails, the remaining power sources can still supply power to the equipment.

[0003] In existing technologies, one of the multiple input power sources in a power supply system operates continuously, while the other serves as a backup. Power is only supplied from the backup source in the event of a failure of the continuously operating input power source. In this approach, the continuously operating power source operates under heavy load for extended periods, resulting in a shorter lifespan and a higher risk of failure. The backup source operates under idle conditions, leading to resource waste. Summary of the Invention

[0004] This application provides a power supply circuit and its control method, power supply equipment, and power supply system. The power supply system has a first input power supply and a second input power supply that can simultaneously power the equipment. Both the first and second input power supplies have long service lives, allowing for full utilization of electrical energy resources. Furthermore, it has high power density, supports an N+1 backup scheme, and reduces the cost of the power supply system.

[0005] In a first aspect, this application provides a power supply circuit. The power supply circuit includes a first power conversion circuit, a second power conversion circuit, and a switching circuit. The first input terminal of the first power conversion circuit is electrically connected to a first input power source, and the second input terminal of the second power conversion circuit is electrically connected to a second input power source. The first power conversion circuit receives a first input voltage provided by the first input power source through its first input terminal and converts the first input voltage into a first output voltage. The second power conversion circuit receives a second input voltage provided by the second input power source through its second input terminal and converts the second input voltage into a second output voltage, thereby providing a stable voltage to the load. The switching circuit is electrically connected between the first and second input terminals and is used to connect or disconnect the electrical connection between the first and second input terminals. When the electrical connection between the first input power source and the first power conversion circuit is disconnected, the switching circuit connects the electrical connection between the first and second input terminals, allowing the second input power source to provide a second input voltage to the first power conversion circuit through its first input terminal and to the second power conversion circuit through its second input terminal. In this scheme, when both the first and second input power supplies are functioning normally, they can simultaneously power the equipment. Both power supplies have long lifespans, maximizing energy utilization and contributing to energy conservation and cost savings. Even when the electrical connection between the first input power supply and the first power conversion circuit is disconnected, both circuits remain connected to the second input power supply, maintaining a relatively stable output voltage and high power density. Furthermore, this power supply system can utilize an N+1 backup scheme, requiring fewer power supply circuits to achieve stable and reliable power supply, while also reducing system cost and size.

[0006] In specific technical solutions, the aforementioned switching circuits may include, but are not limited to, relays, thyristors, metal-oxide-semiconductor field-effect transistors (MOSFETs), insulated-gate bipolar transistors (IGBTs), and power converters. The appropriate circuit can be selected based on actual requirements.

[0007] In one technical solution, when the electrical connection between the first input power supply and the first power conversion circuit is disconnected, the second power conversion circuit can instantaneously provide the rated power output of the power supply system. The second power conversion circuit has a certain instantaneous overload capacity, thus maintaining normal power supply to the power supply system even when the electrical connection between the first input power supply and the first power conversion circuit is disconnected, until the second input power supply provides a second input voltage to the first power conversion circuit, allowing both the first and second power conversion circuits to simultaneously supply power to the load.

[0008] In addition, the aforementioned first power conversion circuit may also include a reverse output unit, which is used to transmit voltage toward the first input terminal to charge the energy storage devices such as capacitors in the first power conversion circuit. In the event of a failure of the first input power supply, the second power conversion circuit can reversely charge the energy storage devices of the first power conversion circuit from the output terminal of the first power conversion circuit, thereby shortening the connection time of the first switching circuit and making the state switching process of the first switching circuit smoother, thereby improving the reliability of the power supply circuit.

[0009] The aforementioned power supply circuit may further include a first soft-start circuit, which is connected in parallel with the switching circuit. When the electrical connection between the first input power supply and the first power conversion circuit is broken, the second input power supply first provides a second input voltage to the first power conversion circuit through the first soft-start circuit. When the first soft-start circuit reaches a first threshold, the second input power supply provides the second input voltage to the first power conversion circuit through the switching circuit. That is, the second input voltage is first provided to the first power conversion circuit through the first soft-start circuit, and when the first soft-start circuit reaches the first threshold, the second input voltage is provided to the first power conversion circuit through the switching circuit. This scheme can shorten the connection time of the switching circuit and make the switching circuit state switching process smoother, thereby improving the reliability of the power supply circuit.

[0010] In a specific technical solution, the aforementioned first threshold condition can be that the voltage difference across the first soft-start circuit is less than or equal to a fourth threshold. Alternatively, in another specific technical solution, the aforementioned first threshold condition can be that the first soft-start circuit remains in a conducting state for a first time period. By reasonably selecting the length of the first time period, it can be ensured that after the first soft-start circuit remains in a conducting state for the first time period, the voltage difference across the first soft-start circuit is also small, for example, less than or equal to the fourth threshold. Under this condition, the voltage received by the first power conversion circuit has been slowly increased to a value close to the second input voltage provided by the second input power supply, so that the second input power supply can directly provide the second input voltage to the first power conversion circuit through the first switching circuit, and the first power conversion circuit does not need to perform a significant voltage boost.

[0011] In one technical solution, the power supply system may further include a second soft-start circuit. When the electrical connection between the first input power supply and the first power conversion circuit is broken, the second input power supply first provides a second input voltage to the first power conversion circuit through the second soft-start circuit and a switching circuit. When the second soft-start circuit reaches a second threshold, it switches to a short-circuit state, and the second input power supply provides the second input voltage to the first power conversion circuit through the switching circuit. That is, the second input voltage is first provided to the first power conversion circuit through the second soft-start circuit and the switching circuit. When the second soft-start circuit reaches the second threshold, it short-circuits, and the second input voltage is provided to the first power conversion circuit through the switching circuit. This solution can shorten the connection time of the switching circuit and make the switching circuit state switching process smoother, thereby improving the reliability of the power supply circuit.

[0012] In a specific technical solution, the aforementioned second threshold condition can be that the voltage difference across the second soft-start circuit is less than or equal to the fifth threshold. Alternatively, in another specific technical solution, the aforementioned second threshold condition can be that the second soft-start circuit remains in a conducting state for a second time period. By reasonably selecting the length of the second time period, it can be ensured that after the second soft-start circuit remains in a conducting state for a second time period, the voltage difference across the second soft-start circuit is also small, for example, less than or equal to the fifth threshold. Under this condition, the voltage received by the first power conversion circuit has been slowly increased to a value close to the second input voltage provided by the second input power supply, so that the second input power supply can directly provide the second input voltage to the first power conversion circuit through the first switching circuit, and the first power conversion circuit does not need to perform a significant voltage boost.

[0013] The first input terminal of the aforementioned first power conversion circuit can also be connected to a first anti-reverse current circuit. When the electrical connection between the first input power supply and the first power conversion circuit is broken, the first anti-reverse current circuit prevents current from the second input power supply from being transmitted to the side where the first input power supply is located through the switching circuit. This solution helps improve the safety and reliability of the power supply system and protects the electronic components within the power supply system.

[0014] Furthermore, a second anti-reverse current circuit can be connected to the output of the first power conversion circuit. This second anti-reverse current circuit prevents current from flowing from the output of the first power conversion circuit back to it. This solution improves the safety and reliability of the power supply system and protects the electronic components within it.

[0015] For example, in one technical solution, the output terminals of the first power conversion circuit and the second power conversion circuit can be connected to the same second anti-reverse current circuit, which helps to simplify the structure of the power supply system.

[0016] Alternatively, in another technical solution, the output terminals of the first power conversion circuit and the second power conversion circuit can each be connected to a second anti-reverse current circuit. This solution can also achieve fault isolation between the first and second power conversion circuits, thereby improving the reliability of the power supply system.

[0017] The aforementioned power supply system may further include an electrically connected control circuit and a drive circuit. The drive circuit is connected to a switching circuit, and the control circuit is used to: when the electrical connection between the first input power supply and the first power conversion circuit is disconnected, control the drive circuit to switch the switching circuit from an open state to an on state. The second input power supply then provides a second input voltage to the first power conversion circuit through the switching circuit, and simultaneously provides a second input voltage through the second power conversion circuit. This allows the power supply system to normally supply power to the equipment.

[0018] In one implementation, at least one of the first power conversion circuit, the second power conversion circuit, and the switching circuit is integrated into the same chip, which helps to miniaturize the power supply circuit and reduce the volume occupied by the power supply circuit.

[0019] Secondly, this application also provides a control method for a power supply circuit. This method is used to control the power supply circuit provided in the first aspect. Specifically, the control method includes: determining that the voltage between a first input power source and a first power conversion circuit is lower than a third threshold. The first power conversion circuit receives a first input voltage from the first input power source through a first input terminal and converts the first input voltage into a first output voltage. A second power conversion circuit receives a second input voltage from a second input power source through a second input terminal and converts the second input voltage into a second output voltage. A control switch circuit is switched from an off state to an on state, and both the first and second input terminals simultaneously receive the second input voltage from the second input power source. The second input power source provides the second input voltage to the first power conversion circuit through the switch circuit, and simultaneously, the second input power source also provides the second input voltage to the second power conversion circuit. This solution allows the power supply system to provide a continuous and stable power supply, has a long service life for the input power source, high power density, and low cost and size.

[0020] In one technical solution, the control switch circuit switches from an off state to an on state; prior to this, the process includes: controlling a first soft-start circuit to switch to an on state; determining that the first soft-start circuit reaches a first threshold condition; wherein the first threshold condition is that the voltage difference across the first soft-start circuit is less than or equal to a fourth threshold; or, determining that the on state of the first soft-start circuit lasts for a first time period. This solution can shorten the connection time of the switch circuit and make the state switching process of the switch circuit smoother.

[0021] In another technical solution, the control switch circuit is switched from an open state to a closed state; specifically, this includes: controlling both the second soft-start circuit and the switch circuit to the closed state; determining that the second soft-start circuit reaches a second threshold condition; wherein the second threshold condition is that the voltage difference across the second soft-start circuit is less than or equal to a fifth threshold; or, determining that the closed state of the second soft-start circuit lasts for a second time period; and controlling the second soft-start circuit to switch to a short-circuit state. This solution can also shorten the connection time of the switch circuit and make the state switching process of the switch circuit smoother.

[0022] Thirdly, this application also provides a power supply device, which includes a load and the power supply circuit provided in the first aspect. The power supply circuit is electrically connected to the load for supplying power to the load. In this solution, the power supply circuit enables both the first input power supply and the second input power supply to have a longer service life and a higher power density.

[0023] Fourthly, this application also provides a power supply system. The power supply system includes a first input power source, a second input power source, and the power supply equipment provided in the third aspect above. The first input power source is used to provide a first input voltage to a first power conversion circuit through a first input terminal, which can be a DC voltage or an AC voltage. The second input power source is used to provide a second input voltage to a second power conversion circuit through a second input terminal, which can also be a DC voltage or an AC voltage. Specifically, the first input power source is electrically connected to the first input terminal of the first power conversion circuit, and the second input power source is electrically connected to the second input terminal of the second power conversion circuit. The first and second input power sources of this power supply system can simultaneously supply power to the power supply equipment. Both the first and second input power sources have long service lives, allowing for full utilization of electrical energy resources. Furthermore, the power density is high, supporting an N+1 backup scheme and reducing the cost of the power supply system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the power supply equipment in one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of a power supply system in one embodiment of this application;

[0026] Figure 3 This is a schematic diagram of a power supply system in one embodiment of this application;

[0027] Figure 4 This is a schematic diagram of a power supply system in one embodiment of this application;

[0028] Figure 5 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0029] Figure 6 This is a schematic diagram of a power supply system in one embodiment of this application;

[0030] Figure 7 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0031] Figure 8 These are schematic diagrams of several power supply circuit structures in the embodiments of this application;

[0032] Figure 9 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0033] Figure 10 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0034] Figure 11 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0035] Figure 12 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0036] Figure 13 This is a schematic diagram of a power supply circuit in one embodiment of this application;

[0037] Figure 14 This is a flowchart illustrating a control method for a power supply circuit in an embodiment of this application.

[0038] Figure 15 This is a flowchart illustrating a control method for a power supply circuit in an embodiment of this application.

[0039] Figure 16 This is a flowchart illustrating a control method for the power supply circuit in an embodiment of this application.

[0040] Figure label:

[0041] 01 - Power supply system; 100 - Input power;

[0042] 100a - First input power supply; 100b - Second input power supply;

[0043] 100c - Third input power supply; 200 - Power supply equipment;

[0044] 1-Load; 2-Power supply circuit;

[0045] 21-Power conversion circuit; 21a-First power conversion circuit;

[0046] 21b - Second power conversion circuit; 21c - Third power conversion circuit;

[0047] 22-Switching circuit; 22a-First switching circuit;

[0048] 22b - Second switching circuit; 23 - Input port;

[0049] 23a - First input port; 23b - Second input port;

[0050] 23c - Third Input Port;

[0051] 24 - Output port; 25 - First soft-start circuit;

[0052] 26-Second soft-start circuit; 27-First anti-reverse current circuit;

[0053] 28 - Second anti-reverse current circuit; 3 - Housing. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0055] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0056] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0057] Figure 1 This is a schematic diagram of a power supply system in one embodiment of this application. Figure 2 This is a schematic diagram of a power supply system in one embodiment of this application. Figure 1 and Figure 2As shown, in one embodiment, the power supply system 01 includes multiple input power sources 100 and a power supply device 200. The power supply device 200 includes a load 1 and a power supply circuit 2, which are electrically connected to the load 1 to supply power to the load 1. The load 1 can specifically be an electronic device, etc. The aforementioned electronic device can be mounted on a circuit board and electrically connected to the power supply circuit 2 via the circuit board. Alternatively, the aforementioned load 1 can be electrically connected to the power supply circuit 2 via a cable. Furthermore, the aforementioned power supply device 200 may also include a housing 3. The load 1 and the power supply circuit 2 can be mounted in the same housing 3, or the load 1 and the power supply circuit 2 can be mounted in different housings 3, as long as they are electrically connected.

[0058] The operation of the power supply equipment 200 relies on a reliable power supply, especially in scenarios with high requirements for power supply reliability and power density. For example, the power supply equipment 200 in this application can be a network device or a vehicle. The network device can include devices such as routers or switches, and the vehicle includes vehicles with redundant backup power capabilities. In many scenarios, it is necessary to keep network devices running continuously to maintain the normal operation of other networked devices. Therefore, ensuring a reliable and continuous power supply to the power supply equipment 200 is particularly important. It is understood that any power supply equipment 200 requiring power can adopt the technical solution provided in this application. For example, the power supply equipment 200 can also be a computing device, in-vehicle equipment, terminal equipment, or grid-connected equipment.

[0059] like Figure 1 As shown, the power supply system 01 includes multiple input power sources 100 and at least one power supply circuit 2. Each power supply circuit 2 includes a power conversion circuit 21, which is electrically connected to all the input power sources 100 in the power supply equipment 200. The power supply circuit can convert and process the current of the input power sources 100 and transmit the converted and processed current to the load according to the needs of the power supply equipment. During operation, one of the input power sources 100 continuously operates under heavy load, resulting in a shorter service life and a higher risk of failure. The remaining input power sources 100 serve as backups and are only activated when one of them fails. Therefore, the remaining input power sources 100 continuously operate under no-load conditions, leading to resource waste.

[0060] Figure 3 This is a schematic diagram of a power supply system in an embodiment of this application, such as... Figure 3As shown, in one embodiment, each power supply circuit 2 in the power supply system includes multiple power conversion circuits 21, and each power conversion circuit 21 is electrically connected to one of the input power supplies 100. Specifically, the multiple power conversion circuits 21 in the power supply circuit 2 are electrically connected to the multiple input power supplies 100 in the power supply system in a one-to-one correspondence. Each power conversion circuit 21 is electrically connected to the load, thereby enabling the multiple input power supplies 100 in the power supply system to simultaneously input voltage to the load through the multiple power conversion circuits 21. This solution solves the problem of one input power supply 100 continuously operating under heavy load while the other input power supplies 100 continuously operate under no-load, which helps to extend the service life of the multiple input power supplies 100 and reduce the energy waste of the input power supplies 100.

[0061] When multiple input power sources 100 supply power to the load simultaneously, the voltage transmitted to the load by the entire power supply system drops significantly when one of them fails. Taking a power supply system with two input power sources 100 as an example, each input power source 100 provides 50% of the power to the load through a power conversion circuit 21 connected to each power supply circuit 2. If one input power source 100 fails, the other input power source 100 can only provide 50% of the power to the load, making it difficult to maintain normal load operation. Therefore, N+N backups of the power supply circuits 2 are required. While N power supply circuits 2 can operate normally to supply power to the equipment, to provide sufficient power to the load in the event of a failure of one input power source 100, the power supply system needs to have an additional N backup power supply circuits 2, resulting in an N+N power supply circuit system. This scheme results in a large power supply system size and consequently, a low power density.

[0062] Figure 4 This is a schematic diagram of a power supply system in an embodiment of this application, such as... Figure 4As shown, in one embodiment of this application, the power supply system includes multiple input power sources 100 and multiple power supply circuits 2. Each power supply circuit 2 includes multiple power conversion circuits 21 and at least one switching circuit 22. Specifically, each input power source 100 may include a rectifier cabinet. Each input power source 100 is used to input voltage to each power conversion circuit 21 in each power supply circuit 2. Each power conversion circuit 21 is used to convert the input voltage provided by each input power source 100 into an output voltage and provide it to a load 1. One of the at least one switching circuit 22 is electrically connected between any two power conversion circuits 21. The switching circuit 22 is used to connect or disconnect the electrical connection between its corresponding two power conversion circuits 21. Specifically, when the electrical connection between one of the input power sources 100 and one of the power conversion circuits 21 is disconnected, another input power source 100 inputs voltage to one of the power conversion circuits 21 through a switching circuit 22 electrically connected to that power conversion circuit 21.

[0063] In one embodiment, the power supply system includes a first input power source 100a, a second input power source 100b, and a power supply circuit 2. The power supply circuit 2 includes a first power conversion circuit 21a, a second power conversion circuit 21b, and a switching circuit 22. The first input power source 100a provides a first input voltage to the first power conversion circuit 21a through a first input terminal. Specifically, the first input power source 100a is electrically connected to the first input terminal of the first power conversion circuit 21a. The second input power source 100b provides a second input voltage to the second power conversion circuit 21b through a second input terminal. Specifically, the second input power source 100b is electrically connected to the second input terminal of the second power conversion circuit 21b. The first power conversion circuit 21a converts the first input voltage received from the first input power source 100a through its first input terminal into a first output voltage. The second power conversion circuit 21b converts the second input voltage received from the second input power source 100b through its second input terminal into a second output voltage. The first output voltage and the second output voltage are supplied to the load 1. The aforementioned switching circuit 22 is electrically connected between the first input terminal and the second input terminal. Switching circuit 22 is used to connect or disconnect the electrical connection between the first input terminal and the second input terminal. Specifically, when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, for example, in the event of a fault in the first input power supply 100a, switching circuit 22 connects the electrical connection between the first input terminal and the second input terminal, causing the second input power supply 100b to be electrically connected to the first power conversion circuit 21a through switching circuit 22. This allows the second input power supply 100b to provide a second input voltage to the first power conversion circuit 21a through the first input terminal and to the second power conversion circuit 21b through the second input terminal, thus enabling both the first and second input terminals to simultaneously receive the second input voltage provided by the second input power supply 100b.

[0064] In this embodiment, when all input power supplies 100 are operating normally, they can simultaneously supply power to the power supply equipment. The lifespan of each input power supply 100 is relatively long, allowing for full utilization of electrical energy resources and facilitating energy saving and cost reduction. In the event of a failure in one input power supply 100, the remaining normally operating input power supplies 100 can be simultaneously connected to multiple power conversion circuits 21. For example, if the first input power supply 100a fails, the second input power supply 100b can be used to simultaneously connect the first power conversion circuit 21a and the second power conversion circuit 21b. Thus, the power supply system still provides stable power to the power supply equipment through the second input voltage of the first power conversion circuit 21a and the second power conversion circuit 21b. This scheme ensures that even when some input power supplies 100 in the power supply system fail, all power conversion circuits 21 remain connected to the input power supplies 100, thereby maintaining a relatively stable output voltage of the power supply circuit 2. In this embodiment, the power supply circuit 2 has a high power density. The power supply system can adopt an N+1 backup scheme. When the power supply circuit 2 in the power supply system fails, the backup power supply circuit 2 can be activated to ensure power supply. Therefore, the power supply system can achieve stable and reliable power supply with a small number of power supply circuits 2, and the cost and size of the power supply system are also low.

[0065] The number of multiple input power sources 100, the number of power supply circuits 2, and the number of power conversion circuits 21 included in each power supply circuit 2 are not limited, but usually the number of multiple input power sources 100 and the number of power conversion circuits 21 included in each power supply circuit 2 are the same. Figure 4 In the illustrated embodiment, taking a power supply system comprising two input power sources 100 as an example, each power supply circuit 2 includes two power conversion circuits 21 and one switching circuit 22. This switching circuit 22 can be referred to as the first switching circuit 22a. However, the number of power supply circuits 2 included in the power supply system is not limited.

[0066] Figure 5 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 4 and Figure 5As shown, in one embodiment, the power supply circuit 2 includes two input ports 23, each of which is electrically connected to the input terminal of the power conversion circuit 21 of the power supply circuit 2 via the input port 23. The two input ports 23 include a first input port 23a and a second input port 23b. Specifically, the first input port 23a and the second input port 23b are respectively used to connect to different input power supplies 100. For example, the first input port 23a is used to connect to the first input power supply 100a, and the second input port 23b is used to connect to the second input power supply 100b. The first input port 23a and the first input terminal of the first power conversion circuit 21a are connected in series, so the current from the first input power supply 100a can flow into the first power conversion circuit 21a of the power supply circuit 2 through the first input port 23a. The second input port 23b and the second input terminal of the second power conversion circuit 21b are connected in series, so the current from the second input power supply 100b can flow into the second power conversion circuit 21b of the power supply circuit 2 through the second input port 23b. The power supply circuit 2 also includes an output port 24, which is electrically connected to the load. The first power conversion circuit 21a and the second power conversion circuit 21b are respectively connected to the output port 24, thereby enabling the power supply system to supply power to the load.

[0067] In specific embodiments, such as Figure 4 and Figure 5 As shown, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected in parallel and then connected to the output port 24. Alternatively, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected to the output port 24 respectively. Specifically, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected to the same output port 24 respectively, or the first power conversion circuit 21a can be connected to one output port 24, and the second power conversion circuit 21b can be connected to another output port 24. One end of the first switching circuit 22a is connected between the first input port 23a and the first power conversion circuit 21a, and the other end is connected between the second input port 23b and the second power conversion circuit 21b, thereby bridging the first power conversion circuit 21a and the second power conversion circuit 21b.

[0068] In this embodiment, the power conversion circuit 21 may include various types, such as a rectifier circuit (AC-DC), a direct current converter (DC-DC), an alternating current converter (AC-AC), or an inverter circuit (DC-AC), etc. For a specific implementation of the power conversion circuit 21, it may include at least one of a switching device, an energy storage capacitor, a coupling inductor, a control element, a driving element, and a diode.

[0069] In this embodiment, the first switching circuit 22a can switch its operating state. For example, the first switching circuit 22a can switch from a conducting state to an off state, and also from an off state to a conducting state. Specifically, the switching circuit 22 in this embodiment can include, but is not limited to, a relay, a thyristor, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), or a power converter. The appropriate circuit can be selected based on actual needs.

[0070] The power supply system can have multiple operating states. When the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, the second input power supply 100b provides a second input voltage to the first power conversion circuit 21a through the first switching circuit 22a, and at the same time provides a second input voltage to the second power conversion circuit 21b.

[0071] In the first operating state, both input power sources 100 in the power supply system are electrically connected to their corresponding power conversion circuits 21. For example, in one embodiment, both the first input power source 100a and the second input power source 100b are supplying power normally, and the current input to both the first input port 23a and the second input port 23b is conducting. Therefore, the first switching circuit 22a is in the off state, and the first input power source 100a supplies power to the load through the first power conversion circuit 21a, while the second input power source 100b supplies power to the load through the second power conversion circuit 21b. In this operating state, both the first input power source 100a and the second input power source 100b simultaneously supply power to the load.

[0072] In the second operating state of the power supply system, one of the two input power sources 100 in the power supply system is disconnected from the electrical connection of the corresponding power conversion circuit 21. Taking the disconnection of the electrical connection between the first input power source 100a and the first power conversion circuit 21a as an example, in a possible embodiment, the first input power source 100a fails, while the second input power source 100b provides normal power supply. The first switching circuit 22a switches to the on state, electrically connecting the second input power source 100b and the first power conversion circuit 21a. Then, the second input power source 100b is simultaneously connected to both the first power conversion circuit 21a and the second power conversion circuit 21b. That is, the first power conversion circuit 21a and the second power conversion circuit 21b are connected in parallel and to the second input power source 100b. The second input power source 100b is both on and off the first power conversion circuit 21a and the second power conversion circuit 21b. The second input power source 100b inputs voltage to the first power conversion circuit 21a through the first switching circuit 22a, and simultaneously inputs voltage to the second power conversion circuit 21b, thereby supplying power to the power supply equipment and supporting its normal power demand.

[0073] In this embodiment, when both the first input power supply 100a and the second input power supply 100b are supplying power normally, they can simultaneously supply power to the power supply equipment. The first input power supply 100a and the second input power supply 100b have long service lives, allowing for full utilization of resources and facilitating energy saving and cost reduction. When the electrical connection between the first input power supply 100a and the first power conversion circuit is disconnected, for example, but not limited to, a possible failure of the first input power supply 100a, the first switching circuit 22a can switch to the on state. This allows the normally powered second input power supply 100b to be electrically connected to both the first power conversion circuit 21a and the second power conversion circuit 21b simultaneously, providing a second input voltage to both circuits, thus enabling the supply of stable and continuous power to the load. This scheme allows the power conversion circuit 21 connected to the faulty input power supply 100 to still receive input voltage even when one of the input power supplies 100 in the power supply system fails. Therefore, all power conversion circuits 21 in the power supply circuit can provide output voltage, thus maintaining a relatively stable output voltage for the power supply circuit 2. In this embodiment, the power supply circuit 2 has a high power density, and the power supply system can employ an N+1 backup scheme. A stable and reliable power supply can be achieved with a smaller number of power supply circuits 2. Therefore, the cost and size of the power supply system are also lower.

[0074] Figure 6 This is a schematic diagram of a power supply system in one embodiment of this application. Figure 7 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 6and Figure 7 The illustrated embodiment, taking a power supply system comprising three input power sources 100 as an example, includes three power conversion circuits 21 and two switching circuits 22 in each power supply circuit 2. However, the number of power supply circuits 2 included in the power supply system is not limited. For ease of description, the three input power sources 100 in the power supply system are designated as a first input power source 100a, a second input power source 100b, and a third input power source 100c, and the three power conversion circuits 21 in each power supply circuit 2 are designated as a first power conversion circuit 21a, a second power conversion circuit 21b, and a third power conversion circuit 21c. The input terminal of the third power conversion circuit 21c is connected to a third input port 23c. The two switching circuits 22 in the power supply system are designated as a first switching circuit 22a and a second switching circuit 22b.

[0075] In a specific embodiment, the first power conversion circuit 21a, the second power conversion circuit 21b, and the third power conversion circuit 21c in the power supply circuit 2 can be connected in parallel before being connected to the output port 24. Alternatively, the first power conversion circuit 21a, the second power conversion circuit 21b, and the third power conversion circuit 21c can be connected to the output port 24 respectively. Specifically, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected to the same output port 24 respectively, or the first power conversion circuit 21a can be connected to one output port 24, the second power conversion circuit 21b can be connected to another output port 24, and the third power conversion circuit 21c can be connected to yet another output port 24.

[0076] In this embodiment, the power supply system can have more operating states. In the first operating state, both input power sources 100 in the power supply system are electrically connected to the corresponding power conversion circuit 21. For example, in one embodiment, the first input power source 100a, the second input power source 100b, and the third input power source 100c are all supplying power normally. In this case, the first switching circuit 22a and the second switching circuit 22b are both in the off state. The first input power source 100a becomes the load input voltage through the first power conversion circuit 21a, the second input power source 100b becomes the load input voltage through the second power conversion circuit 21b, and the third input power source 100c becomes the load input voltage through the third power conversion circuit 21c.

[0077] In the second operating state, one of the three input power sources 100 in the power supply system is disconnected from the electrical connection of the corresponding power conversion circuit 21. For example, the electrical connection between the first input power source 100a and the first power conversion circuit 21a is disconnected. In a possible embodiment, if the first input power supply 100a fails, while the second input power supply 100b and the third input power supply 100c are supplying power normally, the first switching circuit 22a switches to the on state, and the second switching circuit 22b is in the off state. The second input power supply 100b provides the second input voltage to the first power conversion circuit 21a through the first switching circuit 22a. The second input power supply 100b is simultaneously connected to both the first power conversion circuit 21a and the second power conversion circuit 21b. That is, the first power conversion circuit 21a and the second power conversion circuit 21b are connected in parallel and to the second input power supply 100b. Since the second input power supply 100b is both on and off with the first power conversion circuit 21a, both the first power conversion circuit 21a and the second power conversion circuit 21b can receive the second input voltage provided by the second input power supply 100b to supply power to the power supply equipment. At this time, the third power conversion circuit 21c still draws power from the third input power supply 100c and receives the third input voltage provided by the third input power supply 100c, thereby supporting the normal power demand of the power supply equipment.

[0078] In the third operating state, two of the three input power sources 100 in the power supply system are disconnected from their corresponding power conversion circuits 21. For example, if any two of the first input power sources 100a, second input power source 100b, and third input power source 100c fail, and the remaining input power sources 100 operate normally, then both the first switching circuit 22a and the second switching circuit 22b switch to the on state. The normally operating input power source 100 is then simultaneously connected to the first power conversion circuit 21a, the second power conversion circuit 21b, and the third power conversion circuit 21c. That is, the first power conversion circuit 21a, the second power conversion circuit 21b, and the third power conversion circuit 21c are connected in parallel and connected to the normally operating input power source 100. Therefore, the first power conversion circuit 21a, the second power conversion circuit 21b, and the third power conversion circuit 21c can all receive input voltage from the normally operating input power source 100 to supply power to the equipment.

[0079] Figure 8 Here are some schematic diagrams of different structures of the power supply circuit 2 in the embodiments of this application, such as... Figure 8As shown in the embodiments of this application, the number of input ports included in the power supply circuit 2 is not limited, the type of voltage input to the input ports of the power supply circuit 2 is not limited, and the type of voltage connected to the output ports of the power supply circuit 2 is not limited. In this embodiment, the first input voltage provided by the first input power supply can be a DC voltage or an AC voltage, and the second input voltage provided by the second input power supply can also be a DC voltage or an AC voltage. Therefore, the input ports of the power supply circuit 2 can input either alternating current (AC) or direct current (DC). For example, all input ports of the power supply circuit 2 can input AC voltage, all input ports can input DC voltage, or some input ports can input AC voltage and other input ports can input DC voltage. The output voltage of the power supply circuit 2 can also be either DC voltage (AC) or alternating current (DC), and this application does not impose any restrictions on this.

[0080] In some implementations of this application, at least one of the first power conversion circuit 21a, the second power conversion circuit 21b, and the switching circuit 22 of the power supply circuit 2 is integrated into the same chip, which is beneficial for miniaturizing the power supply circuit and reducing the volume occupied by the power supply circuit. In a specific embodiment, the first power conversion circuit 21a, the second power conversion circuit 21b, and the switching circuit 22 can all be integrated into the same chip.

[0081] In one embodiment, when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, the second power conversion circuit 21b can instantaneously provide the rated power output of the power supply system, that is, the second power conversion circuit 21b can have a certain instantaneous overload capacity. In this embodiment, all power conversion circuits 21 in the power supply circuit 2 have a certain instantaneous overload capacity. Here, instantaneous overload capacity refers to the power of the power conversion circuit 21 exceeding its rated power output for a short period of time. The duration of "instantaneous" can be determined according to the application scenario of the power supply circuit 2, and is usually in the millisecond range. The rated power output of the power conversion circuit 21 refers to the highest power that the power conversion circuit 21 can achieve during long-term normal operation.

[0082] Specifically, such as Figure 5In the illustrated embodiment, if the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is broken, for example, if the first input power supply 100a fails, the second power conversion circuit 21b can momentarily provide the rated power output of the power supply circuit 2. The rated power of the power supply circuit 2 refers to the highest power output of the power supply circuit 2 during normal operation over a long period of time. When the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, before the first switching circuit 22a successfully switches to the on state, the first power conversion circuit 21a has not yet received the second input voltage provided by the second input power supply 100b. Therefore, the second input power supply 100b and the second power conversion circuit 21b are needed to supply power to the power supply equipment. The instantaneous power of the second power conversion circuit 21b can be overloaded to provide the rated power output of the entire power supply circuit 2 to maintain the operation of the power supply equipment until the first switching circuit 22a successfully switches to the on state. The first power conversion circuit 21a is then electrically connected to the second input power supply 100b through the first switching circuit 22a, so that the first power conversion circuit 21a and the second power conversion circuit 21b simultaneously receive voltage. The power supply circuit 2 can then operate at its rated power to supply power to the load.

[0083] In one specific embodiment, the instantaneous power of each power conversion circuit 21 in the power supply circuit 2 is greater than or equal to 75% of the rated power of the power supply circuit 2. For example, the instantaneous power of the power conversion circuit 21 can be 78%, 80%, 85%, 87%, 90%, 92%, 95%, 98%, or 100% of the rated power of the power supply circuit 2. In this scheme, when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, it is necessary to switch the first switching circuit 22a to the on state. For a period of time, the power conversion circuit 21 connected to the normally powered input power supply 100 needs to be used for power supply. During this period, the instantaneous power of the power conversion circuit 21 can reach 75% of the rated power of the power supply circuit 2, which can also maintain the operation of the power supply equipment.

[0084] In one embodiment, the first power conversion circuit 21a in the power supply circuit 2 includes a reverse output unit, which is used to transmit voltage from the output terminal of the first power conversion circuit 21a toward the first input terminal. This enables reverse voltage transmission of the first power conversion circuit 21a. Since the power conversion circuit 21a is equipped with energy storage devices such as capacitors, when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, the second power conversion circuit 21b can reversely charge the energy storage devices of the first power conversion circuit 21a from its output terminal. This shortens the connection time of the first switching circuit 22a, making the state switching process of the first switching circuit 22a smoother, thereby improving the reliability of the power supply circuit 2.

[0085] Similarly, the second power conversion circuit 21b may also include a reverse output unit for transmitting current toward the second input port 23b to charge the energy storage device of the second power conversion circuit 21b.

[0086] In a specific embodiment, the reverse output unit may include switching devices, energy storage devices, filtering devices, control devices, and diodes, etc. By designing the electrical connections and control methods of each device, the voltage reverse transmission of the first power conversion circuit 21a can be realized.

[0087] Figure 9 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 9 As shown, in one embodiment, the power supply circuit 2 further includes a first soft-start circuit 25. A soft-start circuit is a circuit used to control the slow startup of the power supply, designed to prevent sudden changes in voltage or current from impacting the power conversion circuit. In one implementation, the first soft-start circuit 25 may include a resistor and a capacitor, utilizing the slow voltage rise during capacitor charging to delay the full connection of the second input power supply. Alternatively, in another implementation, the first soft-start circuit 25 may also include a metal-oxide-semiconductor field-effect transistor (MOSFET), delaying the full connection of the second input power supply by controlling the slow rise of the MOSFET's gate voltage. Specifically, the slow voltage rise of the first soft-start circuit 25 can slowly charge the energy storage device of the first power conversion circuit 21a.

[0088] Specifically, the first soft-start circuit 25 is connected in parallel with the first switching circuit 22a. The first soft-start circuit 25 also includes an on state and an off state. When the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is broken, the first soft-start circuit 25 can be switched to the on state first. The second input power supply 100b then provides a second input voltage to the first power conversion circuit 21a through the first soft-start circuit 25 to charge the energy storage device of the first power conversion circuit 21a, reliably charging the first power conversion circuit 21a and protecting its components. When the first soft-start circuit 25 reaches a first threshold condition, the first switching circuit 22a is then switched to the on state, and the second input power supply 100b then provides the second input voltage to the first power conversion circuit 21a through the first switching circuit 22a. This shortens the connection time of the first switching circuit 22a and makes the state switching process of the first switching circuit 22a smoother, thereby improving the reliability of the power supply circuit 2.

[0089] In one embodiment, when the first switching circuit 22a is switched to the on state, the first soft-start circuit 25 can be short-circuited, or the first soft-start circuit can be switched to the off state.

[0090] In one specific embodiment, the first threshold condition can be that the voltage difference across the first soft-start circuit 25 is less than or equal to a fourth threshold. Alternatively, in another specific embodiment, the first threshold condition can be that the first soft-start circuit 25 remains in a conducting state for a first time period. By reasonably selecting the length of the first time period, it can be ensured that after the first soft-start circuit 25 remains in a conducting state for the first time period, the voltage difference across the first soft-start circuit 25 is also small, for example, less than or equal to the fourth threshold. Under this condition, the voltage received by the first power conversion circuit 21a is gradually increased to a value close to the second input voltage provided by the second input power supply 100b, so that the second input power supply 100b can directly provide the second input voltage to the first power conversion circuit 21a through the first switching circuit 22a, and the first power conversion circuit 21a does not need to perform a significant voltage boost.

[0091] In one specific embodiment, the first soft-start circuit 25 and the first switching circuit 22a can be integrated into a single structure, that is, from a physical structure perspective, the first soft-start circuit 25 and the first switching circuit 22a are integrated into one unit. For example, the components of the first soft-start circuit 25 and the components of the first switching circuit 22a can be located in the same chip.

[0092] Figure 10 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 10As shown, in one embodiment, the power supply circuit 2 may also include a second soft-start circuit 26. The structure and function of the second soft-start circuit 26 are similar to those of the first soft-start circuit 25. The voltage of the second soft-start circuit 26 rises slowly, which can slowly charge the energy storage device of the first power conversion circuit 21a. This will not be described in detail here. In one embodiment, when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, a second soft-start circuit 26 is switched to the connected state, and the first switching circuit 22a is switched to the conducting state. The second input power supply 100b is electrically connected to the first power conversion circuit 21a through the first switching circuit 22a and the aforementioned second soft-start circuit 26. The second input power supply 100b first provides a second input voltage to the first power conversion circuit 21a through the second soft-start circuit and the switching circuit to charge the energy storage device of the first power conversion circuit 21a. The second input power supply 100b charges the energy storage device of the first power conversion circuit 21a through the second soft-start circuit 26, which can reliably charge the first power conversion circuit 21a and protect the devices of the first power conversion circuit 21a. When the second soft-start circuit 26 reaches the second threshold, the second soft-start circuit 26 is switched to a short-circuit state, so that the second input power supply 100b provides the second input voltage to the first power conversion circuit 21a through the switching circuit. This scheme can also make the state switching process of the first switching circuit 22a smoother, thereby improving the reliability of the power supply circuit 2.

[0093] In one embodiment, a second soft-start circuit 26 is electrically connected between the first switching circuit 22a and the first power conversion circuit 21a, and another second soft-start circuit 26 may be connected between the first switching circuit 22a and the second power conversion circuit 21b. One end of the first switching circuit 22a is connected between the first input port 23a and the second soft-start circuit 26, and the other end is connected between the second input port 23b and the other second soft-start circuit 26.

[0094] In one specific embodiment, the second threshold condition can be that the voltage difference across the second soft-start circuit 26 is less than or equal to the fifth threshold. Alternatively, in another specific embodiment, the second threshold condition can be that the second soft-start circuit 26 remains in the conducting state for a second time period. By reasonably selecting the length of the second time period, it can be ensured that after the second soft-start circuit 26 remains in the conducting state for a second time period, the voltage difference across the second soft-start circuit 26 is also small, for example, less than or equal to the fifth threshold. Under this condition, the voltage received by the first power conversion circuit 21a is gradually increased to a value close to the second input voltage provided by the second input power supply 100b, so that the second input power supply 100b can directly provide the second input voltage to the first power conversion circuit 21a through the first switching circuit 22a, and the first power conversion circuit 21a does not need to perform a significant voltage boost.

[0095] Figure 11 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 11 As shown, in one embodiment, the first input terminal of the first power conversion circuit 21a of the power supply circuit 2 is connected to a first anti-reverse current circuit 27. When the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is broken, the first anti-reverse current circuit 27 prevents the current from the second input power supply 100b from being transmitted to the side where the first input power supply 100a is located through the first switching circuit 22a. In a specific embodiment, the first input port 23a, the first anti-reverse current circuit 27, and the first power conversion circuit 21a are connected in series, so the current from the first input power supply 100a can flow through the first input port 23a into the first anti-reverse current circuit 27 of the power supply circuit 2 and then into the first power conversion circuit 21a. Similarly, the second input terminal of the second power conversion circuit 21b can also be connected to a first anti-reverse current circuit 27. The second input port 23b, the other first anti-reverse current circuit 27, and the second power conversion circuit 21b are connected in series. Thus, the current from the second input power supply 100b can flow through the second input port 23b into the other first anti-reverse current circuit 27 of the power supply circuit 2 and then to the second power conversion circuit 21b. One end of the first switching circuit 22a is connected between a first anti-reverse current circuit 27 and the first power conversion circuit 21a, and the other end is connected between another first anti-reverse current circuit 27 and the second power conversion circuit 21b.

[0096] The aforementioned first anti-reverse current circuits 27 each have anti-reverse current functions. Specifically, the first anti-reverse current circuit 27 may include a unidirectional current-carrying module, for example, the unidirectional current-carrying module may be a diode or a circuit equivalent to a diode. When the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is disconnected, and the first power conversion circuit 21a is electrically connected to the second input power supply 100b through the first switching circuit 22a, the first anti-reverse current circuit 27 prevents the current supplied by the second input power supply 100b from flowing from the first switching circuit 22a to the side where the first input power supply 100a is located; that is, the current will not flow backward. This solution helps improve the safety of the power supply system and protects the electronic components in the power supply system.

[0097] like Figure 11As shown, in one embodiment, when specifically implementing the connection of the first switching circuit 22a, the first anti-reverse current circuit 27 and the first power conversion circuit 21a can be electrically connected through a first line, and the other first anti-reverse current circuit 27 and the second power conversion circuit 21b can be electrically connected through a second line. One end of the first switching circuit 22a is electrically connected to the first line, and the other end is electrically connected to the second line, thereby realizing the electrical connection of the first switching circuit 22a. Alternatively, in one embodiment, one end of the first switching circuit 22a can be connected to the side of the first anti-reverse current circuit 27 facing the first power conversion circuit 21a, and the other end can be connected to the end of the other first anti-reverse current circuit 27 facing the second power conversion circuit 21b. Alternatively, in one embodiment, one end of the first switching circuit 22a can be connected to the first input terminal of the first power conversion circuit 21a, and the other end can be connected to the second input terminal of the second power conversion circuit 21b.

[0098] Figure 12 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 12 As shown in one specific embodiment of this application, the output terminal of the first power conversion circuit 21a of the power supply circuit 2 is connected to a second anti-reverse current circuit 28, which is used to prevent current from being transmitted from the output terminal of the first power conversion circuit 21a to the first power conversion circuit 21a. Specifically, it can prevent current from other power supply circuits from being transmitted from the output terminal of the first power conversion circuit 21a to the first power conversion circuit 21a. This solution is beneficial to improving the safety and reliability of the power supply circuit 2 and protecting the electronic components in the power supply system.

[0099] In this embodiment, the second anti-reverse current circuit 28 can achieve the anti-reverse current function. Specifically, the second anti-reverse current circuit 28 may include a unidirectional current-carrying module, for example, the unidirectional current-carrying module may be a diode or a circuit equivalent to a diode. Especially when the power supply system includes at least two power supply circuits 2, when one of the power supply circuits 2 fails, the current of the other power supply circuits 2 will not flow back to the failed power supply circuit 2, which helps to improve the safety and reliability of the power supply system.

[0100] like Figure 12 As shown, in one specific embodiment, the output terminals of multiple power conversion circuits 21 are connected to the same second anti-reverse current circuit 28. Specifically, the output terminal of the first power conversion circuit 21a is connected to the second anti-reverse current circuit 28, and the output terminal of the second power conversion circuit 21b is also connected to the second anti-reverse current circuit 28. The second anti-reverse current circuit 28 is then connected to the output port 24. The second anti-reverse current circuit 28 is used to prevent current from other power supply circuits 2 from flowing from the output port 24 of the power supply circuit 2 to the first power conversion circuit 21a and the second power conversion circuit 21b. This scheme simplifies the structure of the power supply system.

[0101] In a specific embodiment, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected in parallel before being connected to the second anti-reverse current circuit 28, such as... Figure 12 As shown. Alternatively, the first power conversion circuit 21a and the second power conversion circuit 21b can be connected to the second anti-reverse current circuit 28, respectively. This application does not limit this.

[0102] Figure 13 This is a schematic diagram of a power supply circuit 2 in an embodiment of this application, such as... Figure 13 As shown in a specific embodiment of this application, the output terminal of each of the plurality of power conversion circuits 21 is respectively connected to a second anti-reverse current circuit 28. Specifically, the output terminal of the first power conversion circuit 21a is connected to a second anti-reverse current circuit 28, which is used to prevent current from flowing from the output port 24 of the power supply circuit 2 to the first power conversion circuit 21a. The output terminal of the second power conversion circuit 21b is connected to another second anti-reverse current circuit 28, which is used to prevent current from flowing from the output port 24 of the power supply circuit 2 to the second power conversion circuit 21b.

[0103] In this embodiment, the first power conversion circuit 21a and the second power conversion circuit 21b are respectively connected to a second anti-reverse current circuit 28. Therefore, even if either the first power conversion circuit 21a or the second power conversion circuit 21b fails, no current will flow backward. For example, if the first power conversion circuit 21a fails, the current output by the second power conversion circuit 21b will not flow backward to the first power conversion circuit 21a. This solution can also achieve fault isolation between the first power conversion circuit 21a and the second power conversion circuit 21b, thereby improving the reliability of the power supply system.

[0104] In one embodiment, the power supply system further includes a control circuit and a drive circuit. The control circuit is connected to the drive circuit, and the drive circuit is connected to the switch circuit 22. The control circuit controls the drive circuit to drive the switch circuit 22 to switch between an on and off state. Specifically, the control circuit can control the operation of the drive circuit based on the electrical connection state of the first input power supply 100a and the second input power supply 100b. Specifically, the control circuit is used to: when the electrical connection between the first input power supply 100a and the first power conversion circuit 21a is broken, control the drive circuit to drive the first switch circuit 22a to switch to an on state, connecting the second input power supply 100b and the first power conversion circuit 21a. The second input power supply 100b then provides a second input voltage to the first power conversion circuit 21a through the first switch circuit 22a. This allows the power supply system to normally supply power to the power supply equipment.

[0105] When the first input power supply 100a and the first power conversion circuit 21a are electrically connected, and the second input power supply 100b and the second power conversion circuit 21b are electrically connected, the control drive circuit drives the first switching circuit 22a to switch to the off state. Then, the first power conversion circuit 21a independently receives the first input voltage from the first input power supply 100a, and the second power conversion circuit 21b independently receives the second input voltage from the second input power supply 100b, thereby normally supplying power to the power supply equipment.

[0106] Based on the same inventive concept, this application also provides a control method for a power supply circuit, which is used to control the power supply circuit provided in any of the above embodiments. Figure 14 This is a flowchart illustrating a control method for the power supply circuit in an embodiment of this application, such as... Figure 14 As shown, the control method specifically includes:

[0107] Step S101: Determine that the voltage between the first input power supply 100a and the first power conversion circuit 21a is lower than the third threshold.

[0108] If the voltage between the first input power supply 100a and the first power conversion circuit 21a is lower than a third threshold, it is considered that the electrical connection between the first input power supply 100a and the connected first power conversion circuit 21a is broken, for example, the first input power supply 100a is faulty. The first power conversion circuit 21a is used to receive a first input voltage from the first input power supply 100a through a first input terminal and convert the first input voltage into a first output voltage. The second power conversion circuit 21b is used to receive a second input voltage from the second input power supply 100b through a second input terminal and convert the second input voltage into a second output voltage. The first output voltage and the second output voltage are supplied to the load 1.

[0109] Step S102: Control switch circuit 22 switches from the off state to the on state; the first input terminal and the second input terminal simultaneously receive the second input voltage provided by the second input power supply 100b.

[0110] When the electrical connection between the first input power supply 100a and the first power conversion circuit is disconnected, the second input power supply 100b provides a second input voltage to the first power conversion circuit 21a through the first switching circuit 22a, and simultaneously provides a second input voltage to the second power conversion circuit 21b. This ensures a stable power supply to the power supply equipment and maintains a relatively stable output voltage from the power supply circuit 2. In this embodiment, the power supply circuit 2 has a high power density, and the power supply system can adopt an N+1 backup scheme. When a fault occurs in the power supply circuit 2 in the power supply system, the backup power supply circuit 2 can be activated to ensure power supply. Therefore, a stable and reliable power supply can be achieved with a smaller number of power supply circuits 2, resulting in lower cost and smaller size for the power supply system.

[0111] Figure 15 This is a flowchart illustrating a control method for the power supply circuit in an embodiment of this application, such as... Figure 15 As shown, in one embodiment, the step S102 may further include:

[0112] Step S103: Control the first soft start circuit 25 to switch to the on state;

[0113] The second input power supply 100b inputs voltage to the first power conversion circuit 21a through the first soft-start circuit 25, which helps to reliably charge the energy storage device of the first power conversion circuit 21a, reliably charge the first power conversion circuit 21a, and protect the device of the first power conversion circuit 21a.

[0114] Step S104: Determine that the first soft-start circuit 25 reaches the first threshold condition; wherein, the first threshold condition is that the voltage difference across the first soft-start circuit 25 is less than or equal to the second threshold; or, the first threshold condition is that the first soft-start circuit 25 is in the conducting state for a first time period.

[0115] It can be determined that the second input power supply 100b has completed charging the energy storage device of the first power conversion circuit 21a. Then, the switching circuit 22 is controlled to switch from the off state to the on state. This can shorten the connection time of the first switching circuit 22a and make the state switching process of the first switching circuit 22a smoother, thereby improving the reliability of the power supply circuit 2.

[0116] Figure 16 This is a flowchart illustrating a control method for the power supply circuit in an embodiment of this application, such as... Figure 16 As shown, in another embodiment, step S102 specifically includes:

[0117] Step S105: Control the second soft start circuit 26 and the switching circuit 22 to switch to the on state;

[0118] The second input power supply 100b inputs voltage to the first power conversion circuit 21a through the second soft-start circuit 26 and the first switching circuit 22a, which helps to reliably charge the energy storage device of the first power conversion circuit 21a and protect the device of the first power conversion circuit 21a.

[0119] Step S106: Determine that the second soft-start circuit has reached the second threshold condition; wherein, the second threshold condition is that the voltage difference across the second soft-start circuit 26 is less than or equal to the second threshold; or, the second threshold condition is that the second soft-start circuit 26 is in the conducting state for a second time period.

[0120] It can be determined that the second input power supply 100b has completed charging the energy storage device of the first power conversion circuit 21a. Then, the switching circuit 22 is controlled to switch from the off state to the on state. This can shorten the connection time of the first switching circuit 22a and make the state switching process of the first switching circuit 22a smoother, thereby improving the reliability of the power supply circuit 2.

[0121] Step S107: Control the second soft-start circuit 26 to switch to a short-circuit state. This allows the second input power supply 100b to provide the second input voltage to the first power conversion circuit 21a through the first switching circuit 22a.

[0122] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply circuit, characterized in that, include: A first power conversion circuit is used to receive a first input voltage provided by a first input power supply through a first input terminal, and to convert the first input voltage into a first output voltage. The second power conversion circuit is used to receive the second input voltage provided by the second input power supply through the second input terminal, and to convert the second input voltage into a second output voltage; A switching circuit is used to connect or disconnect the electrical connection between the first input terminal and the second input terminal, wherein: When the electrical connection between the first input power supply and the first power conversion circuit is broken, the switching circuit is used to connect the electrical connection between the first input terminal and the second input terminal.

2. The power supply circuit as described in claim 1, characterized in that, The first power conversion circuit includes an inverting output unit, which is used to transmit voltage toward the first input terminal to charge the energy storage device of the first power conversion circuit.

3. The power supply circuit as described in claim 1 or 2, characterized in that, The power supply circuit further includes a first soft-start circuit. When the electrical connection between the first input power supply and the first power conversion circuit is disconnected, the second input voltage is first provided to the first power conversion circuit through the first soft-start circuit. When the first soft-start circuit reaches a first threshold condition, the second input voltage is provided to the first power conversion circuit through the switching circuit.

4. The power supply circuit as described in claim 1 or 2, characterized in that, The power supply circuit also includes a second soft-start circuit. When the electrical connection between the first input power supply and the first power conversion circuit is disconnected, the second input voltage is first provided to the first power conversion circuit through the second soft-start circuit and the switching circuit. When the second soft-start circuit reaches a second threshold condition, the second soft-start circuit is short-circuited, and the second input voltage is provided to the first power conversion circuit through the switching circuit.

5. The power supply circuit as described in any one of claims 1 to 4, characterized in that, The power supply circuit includes a first anti-reverse current circuit, which is connected to the first input terminal of the first power conversion circuit.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that, The power supply circuit includes a second anti-reverse current circuit, which is connected to the output terminal of the first power conversion circuit.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that, The power supply circuit further includes a control circuit and a drive circuit. The control circuit is connected to the drive circuit, and the drive circuit is connected to the switching circuit. The control circuit is used for: When the electrical connection between the first input power supply and the first power conversion circuit is broken, the driving circuit is controlled to drive the switching circuit to switch from the off state to the on state.

8. The power supply circuit as described in any one of claims 1 to 7, characterized in that, The switching circuit includes at least one of a relay, a thyristor, a metal-oxide-semiconductor field-effect transistor, an insulated-gate bipolar transistor, or a power converter.

9. The power supply circuit according to any one of claims 1 to 8, characterized in that, At least one of the first power conversion circuit, the second power conversion circuit, and the switching circuit is integrated into the same chip.

10. A control method for a power supply circuit, characterized in that, The control method includes: The voltage between the first input power supply and the first power conversion circuit is determined to be lower than a third threshold. The first power conversion circuit is used to receive the first input voltage provided by the first input power supply through the first input terminal and to convert the first input voltage into a first output voltage. The second power conversion circuit is used to receive the second input voltage provided by the second input power supply through the second input terminal and to convert the second input voltage into a second output voltage. The switching circuit is controlled to switch from the off state to the on state, and the first input terminal and the second input terminal simultaneously receive the second input voltage provided by the second input power supply.

11. The control method as described in claim 10, characterized in that, Controlling the switching circuit to switch from an off state to an on state; prior to this includes: Control the first soft-start circuit to switch to the on state; The first soft-start circuit is determined to have reached a first threshold condition; wherein the first threshold condition is that the voltage difference across the first soft-start circuit is less than or equal to a fourth threshold; or, the first soft-start circuit is in a conducting state for a first time period.

12. The control method as described in claim 10, characterized in that, Controlling the switching circuit to switch from an open state to an on state; specifically including: Both the second soft-start circuit and the switching circuit are switched to the on state. Determine that the second soft-start circuit reaches a second threshold condition; wherein, the second threshold condition is that the voltage difference across the second soft-start circuit is less than or equal to a fifth threshold; or, the second soft-start circuit remains in the conducting state for a second time period. Control the second soft-start circuit to switch to short-circuit state.

13. A power supply device, characterized in that, It includes a load and a power supply circuit as described in any one of claims 1 to 9, wherein the power supply circuit is electrically connected to the load for inputting a voltage to the load.

14. A power supply system, characterized in that, The device includes a first input power supply, a second input power supply, and the power supply equipment as described in claim 13. The first input power supply is used to provide a first input voltage to the first power conversion circuit through a first input terminal, and the second input power supply is used to provide a second input voltage to the second power conversion circuit through a second input terminal. The first input voltage is a DC voltage or an AC voltage, and the second input voltage is a DC voltage or an AC voltage.

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