Switching circuit, control method, power supply circuit and general redundant power supply

Abstract

The application provides a switching circuit, a control method, a power supply circuit and a general redundant power supply. The switching circuit comprises a control circuit, a coupling circuit, a protection circuit and a back-end circuit. The protection circuit comprises a first field effect transistor and a second field effect transistor. The control circuit is connected with a first power supply and a second power supply and the coupling circuit. The control circuit is used for controlling the first power supply or the second power supply to be connected or disconnected with the switching circuit. The drain of the first field effect transistor is connected with the coupling circuit. The source of the first field effect transistor is connected with the drain of the second field effect transistor and one end of the back-end circuit. The source of the second field effect transistor is connected with the coupling circuit and the other end of the back-end circuit. The back-end circuit is used for being connected with a load device. The protection circuit and the coupling circuit can reduce the loss of the switching circuit in the switching process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a switching circuit, a control method, a power supply circuit and a general redundant power supply. BACKGROUND

[0002] In the scenario of parallel power supply, when one of the power supplies is abnormal, the switching circuit switches to another power supply to supply power to the load device.

[0003] At present, in the process of switching power supply, the switching circuit has the problem of large loss. SUMMARY

[0004] The present application provides a switching circuit, a control method, a power supply circuit and a general redundant power supply to at least solve the problem of large loss of the switching circuit in the process of switching power supply in the related art.

[0005] The present application provides a switching circuit, which comprises a control circuit, a coupling circuit, a protection circuit and a post-stage circuit, the protection circuit comprising a first field effect transistor and a second field effect transistor, wherein:

[0006] The control circuit is connected with the first power supply and the second power supply and the coupling circuit, and is used to control the first power supply or the second power supply to be turned on or turned off with the switching circuit;

[0007] The drain of the first field effect transistor is connected with the coupling circuit, and the source of the first field effect transistor is connected with the drain of the second field effect transistor and one end of the post-stage circuit;

[0008] The source of the second field effect transistor is connected with the coupling circuit and the other end of the post-stage circuit;

[0009] The post-stage circuit is used to be connected with a load device.

[0010] The present application also provides a control method for the above-mentioned switching circuit, which comprises:

[0011] Controlling the switching circuit to be turned on with the first target power supply and controlling the switching circuit to be turned off with the second target power supply, the first target power supply being one of the first power supply and the second power supply, and the second target power supply being the other one of the first power supply and the second power supply;

[0012] In the case of detecting that the first target power supply is abnormal, controlling the switching circuit to be turned off with the first target power supply and controlling the switching circuit to be turned on with the second target power supply.

[0013] The present application also provides a power supply circuit, which comprises a plurality of power supply units.

[0014] Each of the plurality of power supply units is connected with the switching circuit described above;

[0015] The plurality of power supply units are connected with the first power supply and the second power supply, and the first power supply or the second power supply is used to supply power to the load device through the plurality of power supply units.

[0016] The application further provides a general redundant power supply, which comprises the power supply circuit described above, and the first terminal and the second terminal are symmetrically arranged on the front window of the general redundant power supply, the first terminal is used to connect the first power supply, and the second terminal is used to connect the second power supply.

[0017] The application further provides a control device, which comprises:

[0018] The first control module is used to control the switching circuit to be connected with the first target power supply and to be disconnected with the second target power supply, the first target power supply is one of the first power supply and the second power supply, and the second target power supply is the other one of the first power supply and the second power supply except the first target power supply;

[0019] The second control module is used to control the switching circuit to be disconnected with the first target power supply and to be connected with the second target power supply when it is detected that the first target power supply is abnormal.

[0020] The application further provides an electronic device, which comprises a memory used to store a computer program and a processor used to execute the computer program to realize the steps of the control method.

[0021] The application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein the computer program is executed by the processor to realize the steps of the control method.

[0022] The application further provides a computer program product, which comprises a computer program, and the computer program is executed by the processor to realize the steps of the control method.

[0023] In the embodiments of the application, the switching circuit is provided, the first power supply or the second power supply can be controlled by the control circuit, the voltage output by the power supply can be coupled to the subsequent circuit by the coupling circuit, the switching circuit can be protected by the protection circuit when the switching circuit is switched between the first power supply and the second power supply, and the loss of the switching circuit is reduced. The voltage input into the subsequent circuit can be converted into the voltage required by the load device by the subsequent circuit, and the conversion of the electric energy with high power, high efficiency and low loss is realized. It can be understood that the switching circuit can be used for the switching of the power supply, and the transmission of the electric energy with high efficiency and low loss can also be realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] Figure 1 A schematic diagram of a power supply circuit is provided for the related art of the present application.

[0026] Figure 2 A schematic diagram of a switching circuit is provided for the embodiments of the present application. Figure 1 ;

[0027] Figure 3 A schematic diagram of a switching circuit is provided for the embodiments of the present application. Figure 2 ;

[0028] Figure 4 A schematic diagram of a first driving circuit is provided for the embodiments of the present application.

[0029] Figure 5 A schematic diagram of a second driving circuit is provided for the embodiments of the present application.

[0030] Figure 6 A flow chart of a control method is provided for the embodiments of the present application.

[0031] Figure 7 A schematic diagram of a control timing is provided for the embodiments of the present application.

[0032] Figure 8 A schematic diagram of a power supply circuit is provided for the embodiments of the present application.

[0033] Figure 9 A schematic diagram of a general redundant power supply is provided for the embodiments of the present application.

[0034] Figure 10 A schematic diagram of a front window of a general redundant power supply is provided for the embodiments of the present application.

[0035] Figure 11 A structural schematic diagram of a control device is provided for the embodiments of the present application.

[0036] Figure 12 A structural schematic diagram of an electronic device is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0037] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] It should be noted that, in the description of the present application, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. The terms "first", "second" and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0039] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use, processing, transmission, provision, disclosure and application of related data comply with relevant laws, regulations and standards of relevant countries and regions, necessary security measures are taken, do not violate public order and good customs, and provide corresponding operation portal for user to choose authorization or refusal.

[0040] With the rapid development of artificial intelligence technology, information resources are growing rapidly. In order to meet the demand for data operation processing speed, the performance of the server is constantly optimized, accompanied by the continuous improvement of power consumption, and thus the server power supply is required to have high stability.

[0041] Further, in order to meet the increasing power demand of artificial intelligence servers, the server power supply circuit mainly adopts the design of more parallel power supplies. For example, a 16kW server requires at least 5 power supplies to meet the power supply demand of the server. If the power supply redundancy of A or B is to be met, 5+5 redundancy needs to be equipped, as shown in Figure 1 .

[0042] Referring to Figure 1A power supply circuit 10 is provided in the prior art, which includes 10 power supply units (PSU, Power Supply Unit), namely power supply unit a1 to power supply unit a10, wherein the power supply unit a1 to the power supply unit a5 are connected to the A power supply, and the power supply unit a6 to the power supply unit a10 are connected to the B power supply. The A power supply is used to supply power to the load device through the power supply unit a1 to the power supply unit a5, or the B power supply is used to supply power to the load device through the power supply unit a6 to the power supply unit a10.

[0043] In the related art, in the scenario of parallel power supply (such as Figure 1 A power supply and B power supply) power supply, when one of the power supplies is abnormal, the switching circuit switches to the other power supply to supply power to the load device. At present, in the process of switching the power supply, the switching circuit has the problem of large switching circuit loss.

[0044] Based on the above problems, the present application provides a switching circuit, which comprises: a control circuit, a coupling circuit, a protection circuit and a rear-stage circuit, the protection circuit comprising: a first field effect transistor and a second field effect transistor, wherein: the control circuit is connected with a first power supply and a second power supply and the coupling circuit, and the control circuit is used to control the first power supply or the second power supply to be turned on or turned off with the coupling circuit; the drain of the first field effect transistor is connected with the coupling circuit, the source of the first field effect transistor is connected with the drain of the second field effect transistor and one end of the rear-stage circuit; the source of the second field effect transistor is connected with the coupling circuit and the other end of the rear-stage circuit; and the rear-stage circuit is used to be connected with a load device. In the switching circuit of the present application, due to the existence of the protection circuit and the coupling circuit, the loss of the switching circuit in the switching process can be reduced.

[0045] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0046] Reference Figure 2 A switching circuit 20 is provided in the embodiment of the present application, which comprises: a control circuit 21, a coupling circuit 22, a protection circuit 23 and a rear-stage circuit 24.

[0047] The control circuit 21 is connected with a first power supply, a second power supply and the coupling circuit 22; the control circuit 21 is used to control the first power supply or the second power supply to be turned on with the coupling circuit; the coupling circuit 22 is connected with the protection circuit 23; the protection circuit 23 is connected with the rear-stage circuit 24; and the rear-stage circuit 24 is connected with a load device.

[0048] Further, reference is made to Figure 3The protection circuit comprises a first field effect transistor (first MOS in the figure) and a second field effect transistor (second MOS in the figure), wherein the drain of the first field effect transistor is connected with the coupling circuit 22, the source of the first field effect transistor is connected with the drain of the second field effect transistor and one end of the subsequent circuit; the source of the second field effect transistor is connected with the coupling circuit and the other end of the subsequent circuit.

[0049] In some embodiments, the protection circuit further comprises a main relay and a thermistor, the source of the first field effect transistor is connected with one end of the subsequent circuit through the main relay and the thermistor, and the thermistor is connected with the main relay in parallel.

[0050] Specifically, referring to Figure 3 , the drain of the first field effect transistor is connected with the main relay and the thermistor, the thermistor is connected with the main relay in parallel, and the main relay and the thermistor are both connected with one end of the subsequent circuit.

[0051] The first field effect transistor and the second field effect transistor are both MOS field effect transistors (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor). The conduction and cutoff of the drain and the source of the first field effect transistor can be controlled by the gate voltage of the first field effect transistor, so as to realize the on-off control of the circuit or the adjustment of the current and voltage. The conduction and cutoff of the drain and the source of the second field effect transistor can be controlled by the gate voltage of the second field effect transistor, so as to realize the on-off control of the circuit or the adjustment of the current and voltage.

[0052] In the embodiments of the present application, the first field effect transistor and the second field effect transistor constitute a current limiting circuit, and the coupling circuit constitutes a synchronous rectification Buck circuit, which is used for protecting the switching circuit when switching between the first power supply and the second power supply. The specific implementation process is described in detail in the subsequent content.

[0053] Further, the thermistor is a temperature-sensitive resistor, and the thermistor and the main relay are used for protecting the switching circuit when the switching circuit and the first power supply or the second power supply are initially turned on. The specific implementation process is described in detail in the subsequent content.

[0054] In some embodiments, referring to Figure 3 , the control circuit 21 comprises a first relay group 211 and a second relay group 222, wherein:

[0055] The first relay group 211 is connected with the first power supply and the coupling circuit 22, and the first relay group 211 is used for controlling the first power supply and the coupling circuit 22 to be turned on or disconnected;

[0056] The second relay group 212 is connected with the second power supply and the coupling circuit 22, and is used for controlling the second power supply and the coupling circuit 22 to be turned on or turned off.

[0057] It can be understood that whether the first power supply supplies power to the switching circuit is controlled by the first relay group. Whether the second power supply supplies power to the switching circuit is controlled by the second relay group.

[0058] In the embodiment of the present application, the first power supply and the second power supply are both alternating current, wherein the first power supply can provide 230V or 110V alternating current, and the second power supply can provide 230V or 110V alternating current.

[0059] In some embodiments, with reference to Figure 3 The first relay group 211 includes a first relay b1, a second relay b2, a third relay b3 and a fourth relay b4, wherein:

[0060] The first relay b1 is connected with a first output end L1 of the first power supply, the first relay b1 is connected in series with the second relay b2, and the second relay b2 is connected with the coupling circuit 22.

[0061] The third relay b3 is connected with a second output end N1 of the first power supply, the third relay b3 is connected in series with the fourth relay b4, and the fourth relay b4 is further connected with the coupling circuit 22.

[0062] In the embodiment of the present application, the first relay b1 is connected with the first output end L1 of the first power supply through a first fuse, the third relay b3 is connected with the second output end N1 of the first power supply through a second fuse, and the first fuse and the second fuse are used to guarantee the safe and stable operation of the first power supply, the switching circuit and the load device.

[0063] Further, the first output end L1 of the first power supply is a live wire of the first power supply, the second output end N1 of the first power supply is a zero wire of the first power supply, the first relay b1 and the second relay b2 are connected in series on the live wire, and the third relay b3 and the fourth relay b4 are connected in series on the zero wire.

[0064] It can be understood that all the first relay b1 to the fourth relay b4 are closed to control the first power supply and the switching circuit to be turned on, which can improve the power supply safety and avoid mis-triggering.

[0065] In some embodiments, with reference to Figure 3 The second relay group 212 includes a fifth relay b5, a sixth relay b6, a seventh relay b7 and an eighth relay b8, wherein:

[0066] The fifth relay b5 is connected with the first output terminal L2 of the second power supply, the fifth relay b5 is connected in series with the sixth relay b6, and the sixth relay b6 is connected with the coupling circuit 22.

[0067] The seventh relay b7 is connected with the second output terminal N2 of the second power supply, the seventh relay b7 is connected in series with the eighth relay b8, and the eighth relay b8 is connected with the coupling circuit 22.

[0068] In the embodiment of the present application, the fifth relay b5 is connected with the first output terminal L2 of the second power supply through the third fuse, the seventh relay b7 is connected with the second output terminal N2 of the second power supply through the fourth fuse, and the third fuse and the fourth fuse are used to protect the safe and stable operation of the second power supply, the switching circuit and the load device.

[0069] Further, the first output terminal L2 of the second power supply is the live wire of the second power supply, the second output terminal N2 of the second power supply is the zero wire of the second power supply, the fifth relay b5 and the sixth relay b6 are connected in series on the live wire, and the seventh relay b7 and the eighth relay b8 are connected in series on the zero wire.

[0070] It can be understood that the fifth relay b5 to the eighth relay b8 are all closed to control the second power supply and the switching circuit to be turned on, which can improve the power supply safety and avoid mis-triggering.

[0071] In some embodiments, with reference to Figure 3 , the coupling circuit 22 comprises a first capacitor C1, a first inductor L21, a second inductor L22 and a second capacitor C2, wherein:

[0072] The first end of the first capacitor C1 is connected with the second relay b2, the sixth relay b6 and the first end of the first inductor L21;

[0073] The second end of the first capacitor C1 is connected with the fourth relay b4, the eighth relay b8 and the second end of the first inductor L21;

[0074] The third end of the first inductor L21 is connected with the first end of the second inductor L22, and the fourth end of the first inductor L21 is connected with the second end of the second inductor L22;

[0075] The third end of the second inductor L22 is connected with the first end of the second capacitor C2 and the drain of the first field effect transistor, and the fourth end of the second inductor L22 is connected with the second end of the second capacitor C2 and the source of the second field effect transistor.

[0076] Among them, the first capacitor C1 and the second capacitor C2 can be an approval capacitor, and the first inductor L21 and the second inductor L22 can be a common mode inductor.

[0077] In the embodiment of the present application, the first capacitor C1 is used for passing alternating current and blocking direct current. The first inductor L21 and the second inductor L22 generate alternating magnetic field after being electrified. Further, the first inductor L21 and the second inductor L22 are coupled by magnetic field, and the current is transmitted to the second capacitor C2 by electromagnetic induction, the second capacitor C2 is used for power supply for the subsequent protection circuit, and the second capacitor C2 is also used for filtering resonance and the like.

[0078] In summary, the coupling circuit 22 provided by the present application can be used for power transmission.

[0079] In some embodiments, referring to Figure 3 , the rear-stage circuit 24 includes a power factor corrector (PFC) and a resonant converter (LLC), wherein:

[0080] The power factor corrector PFC is connected with the resonant converter LLC, the thermistor, the main relay, and the source of the second field effect transistor. The resonant converter LLC is used for connection with the load device.

[0081] The power factor corrector is used for correcting the current and voltage of the input power factor corrector, so that the current and voltage are in the same phase, and the power utilization efficiency is improved. The resonant converter realizes power conversion by using capacitance and inductance, converts the voltage into the voltage required by the load device (such as 12V), and realizes high-power, high-efficiency and low-loss power conversion.

[0082] In some embodiments, referring to Figure 4 and Figure 5 , the switching circuit 20 further includes a controller 25, a first driving circuit 26 and a second driving circuit 27, wherein:

[0083] The controller 25 is connected with the first driving circuit 26 and the second driving circuit 27;

[0084] The first driving circuit 26 is further connected with the main relay;

[0085] The second driving circuit 27 is further connected with the gate of the first field effect transistor and the gate of the second field effect transistor;

[0086] The controller 25 is used for controlling the first driving circuit to send a driving signal to the main relay;

[0087] The controller 25 is further used for controlling the second driving circuit to send a driving signal to the first field effect transistor and the second field effect transistor.

[0088] In the embodiment of the present application, the controller 25 can be an MCU (Micro-Controller Unit).

[0089] Wherein, referring to Figure 4 The first driving circuit 26 comprises a first resistor R1, a second resistor R2, a first triode Q1, a second triode Q2, a third inductor L61 and a third capacitor C3. Figure 4 A 12V power supply is adopted in the first driving circuit 26, which is connected with the first end of the first resistor R1 and the emitter of the first triode Q1. The base of the first triode Q1 is connected with the second end of the first resistor R1. The collector of the first triode Q1 is connected with the first end of the second resistor R2. The second end of the second resistor R2 is connected with the collector of the second triode Q2 and the first end of the third inductor L61. The controller 25 is connected with the base of the second triode Q2, and the high and low level signals outputted by the controller 25 control the conduction or cut-off of the second triode Q2. The emitter of the second triode Q2 is grounded and connected with the first end of the third capacitor C3. The second end of the third capacitor C3 is connected with the second end of the third inductor L61 and the main relay, which is used to control the closing or opening of the main relay.

[0090] It can be understood that the driving logic of the first driving circuit 26 is that the controller 25 outputs the high level to control the conduction of the second triode Q2. The conduction of the second triode Q2 changes the base potential of the first triode Q1, and then makes the first triode Q1 conduct. After the first triode Q1 conducts, the 12V power supply transmits the electric energy to the third inductor L61 and the third capacitor C3, so that the third inductor L61 and the third capacitor C3 drive the main relay to close. In addition, the controller 25 outputs the low level to control the cut-off of the second triode Q2. The cut-off of the second triode Q2 makes the first triode Q1 cut off. After the first triode Q1 cuts off, the 12V power supply does not supply power to the third inductor L61 and the third capacitor C3, so that the third inductor L61 and the third capacitor C3 drive the main relay to open.

[0091] In the embodiment of the application, the first driving circuit can also be other forms of driving circuit, which is not limited. In addition, the control method of the first relay group and the second relay group can refer to the control method of the main relay, which is not described here.

[0092] Further, referring to Figure 5The second driving circuit 27 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5, a diode F and a driving unit. The first end of the third resistor R3 is connected with a 3.3V power supply, and the second end of the third resistor R3 is connected with the first end of the fourth capacitor C4, the first end of the diode F and the driving unit. The second end of the fourth capacitor C4 is grounded. The second end of the diode F is connected with the driving unit and the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected with the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected with the driving unit. The first end of the fifth resistor R5 is connected with the driving unit, and the second end of the fifth resistor R5 is connected with the gate of the first field effect transistor. The first end of the sixth resistor R6 is connected with the driving unit, and the second end of the sixth resistor R6 is connected with the gate of the first field effect transistor. The controller is connected with the driving unit, and the driving unit is also grounded.

[0093] In Figure 5 which the diode F is used for one-way conduction to prevent the power supply from being reversely connected. The third resistor R3 to the sixth resistor R6 are used for current limiting and voltage dividing to protect the second driving circuit. The fourth capacitor C4 and the fifth capacitor C5 are used for filtering and decoupling to make the voltage input to the driving unit more stable. The controller 25 is used for outputting a control signal to the driving unit to control the working mode of the driving unit. The driving unit is used for processing the control signal sent by the controller 25 to output a driving signal to control the turn-on or turn-off of the first field effect transistor and the second field effect transistor.

[0094] In summary, the switching circuit provided by the present application can control the turn-on of the first power supply or the second power supply through the control circuit, couple the voltage output by the power supply to the subsequent circuit through the coupling circuit, and protect the switching circuit and reduce the loss of the switching circuit when the switching circuit is powered on and when the first power supply and the second power supply are switched through the protection circuit. The voltage input to the subsequent circuit can be converted into the voltage required by the load device through the subsequent circuit, so that high-power, high-efficiency and low-loss electric energy conversion is realized. It can be understood that the switching circuit can be used not only for switching of the power supply, but also for high-efficiency and low-power electric energy transmission.

[0095] Figure 6 A step flow chart of a control method is shown, which is applied to Figure 3 the switching circuit shown, and specifically includes the following steps:

[0096] S601, controlling the switching circuit to be turned on with a first target power supply and to be turned off with a second target power supply.

[0097] The first target power supply is one of the first power supply and the second power supply, and the second target power supply is the other one of the first power supply and the second power supply.

[0098] It can be understood that when the switching circuit is initially powered on, one of the first power supply and the second power supply is selected as the first target power supply, and the other is selected as the second target power supply. After the first target power supply is determined, the switching circuit is controlled to be conductive with the first target power supply, and in addition, the switching circuit is controlled to be non-conductive with the second target power supply, that is, the switching circuit is controlled to be disconnected with the second target power supply.

[0099] The first target power supply can be a preset power supply in the first power supply and the second power supply, that is, the first target power supply is preset. For example, if the first target power supply is the first power supply, the second target power supply is the second power supply. If the first target power supply is the second power supply, the second target power supply is the first power supply.

[0100] In some embodiments, S601 includes: controlling a first target relay group corresponding to the first target power supply to be closed, the first target relay group being one of a first relay group and a second relay group; controlling a first field effect transistor to be conductive, a main relay to be disconnected, and a power factor corrector to be turned on; and controlling the main relay to be conductive.

[0101] It can be understood that if the first target power supply is the first power supply, the first target relay group is the first relay group, and if the first target power supply is the second power supply, the first target relay group is the second relay group.

[0102] In the embodiments of the present application, when initially powered on, the first target relay group corresponding to the first target power supply is first controlled to be closed, and the second target relay group corresponding to the second target power supply is controlled to be disconnected. At this time, the switching circuit is conductive with the first target power supply and is disconnected with the second target power supply. During the closing of the first target relay group, the main relay is always disconnected. Further, the first field effect transistor is controlled to be conductive, the main relay is controlled to continue to be disconnected, and the power factor corrector is turned on. At this time, the first target power supply can supply power to the load device through the switching circuit. In this process, the first target power supply passes through the first target relay group, the coupling circuit, the first field effect transistor, and the thermistor to form a surge suppression circuit. After the slow start of the first target power supply is completed, the main relay is conductive, the thermistor is bypassed, and power is supplied to the subsequent circuit through the main relay.

[0103] During the conduction of the first target power supply and the switching circuit, the second field effect transistor is disconnected.

[0104] In the embodiments of the present application, during the conduction of the first target power supply and the switching circuit, the surge suppression circuit formed can protect the subsequent circuit and the load device from surge voltage and current impact.

[0105] S602, in the case where it is detected that the first target power supply is abnormal, the switching circuit is controlled to be disconnected with the first target power supply, and the switching circuit is controlled to be conductive with the second target power supply.

[0106] In the embodiments of the present application, when the first target power supply is abnormal, the second target power supply can be switched to supply power, and the stability of the load device can be improved.

[0107] In some embodiments, the control of the switching circuit to be disconnected from the first target power supply comprises: at a first time, controlling the first field effect transistor to be disconnected and the power factor corrector to be turned off; and at a second time, controlling the first target relay group to be disconnected, the second time being later than the first time.

[0108] In the embodiments of the present application, the first field effect transistor can be controlled to be disconnected immediately after the first target power supply is abnormal, or the first field effect transistor can be controlled to be disconnected at a first time after the first target power supply is abnormal (for example, 4 ms after the abnormality).

[0109] It can be understood that the delay is to avoid mis-switching due to voltage jitter of the first target power supply. If the first target power supply is abnormal between the first time and the occurrence of the abnormality, the first field effect transistor is controlled to be disconnected.

[0110] For example, if the first target power supply is a first power supply and the second target power supply is a second power supply, with reference to Figure 7 At T0 and before T0, the first relay group is closed, the second relay group is disconnected, the first field effect transistor is turned on, the second field effect transistor is turned off, and the PFC is turned on. This stage is that the first power supply and the switching circuit are turned on, and the first power supply supplies power to the load circuit. At T0, the first power supply is abnormal. At a first time T1 after the abnormality, the first field effect transistor is controlled to be disconnected, and the PFC is controlled to be turned off. At this time, the voltage of the first power supply will not supply power to the subsequent circuit, that is, will not supply power to the load device.

[0111] Then at a second time T2, the first relay group is controlled to be disconnected. In the embodiments of the present application, the time difference between the second time and the first time can be a preset value, for example, 1.5 ms.

[0112] It can be understood that the first field effect transistor is disconnected first, and then the first target relay group is disconnected, so that the first target power supply can be disconnected.

[0113] In some embodiments, the control of the switching circuit to be connected to the second target power supply comprises: at a second time, controlling the second target relay group to be connected, the second target relay group being another one of the first relay group and the second relay group except the first target relay group; between a third time and a fourth time, controlling the first field effect transistor and the second field effect transistor to be alternately turned on, the third time being later than the second time, and the fourth time being later than the third time; and at the fourth time, controlling the first field effect transistor to be turned on, the second field effect transistor to be turned off, and the power factor corrector to be turned on.

[0114] It can be understood that if the first target relay is the first relay and the second target relay is the second relay, if the first target relay is the second relay, the second target relay is the first relay. Figure 7 Taking the first target relay as the first relay and the second target relay as the second relay as an example.

[0115] Referring to Figure 7 At the second time T2, the first target relay group is controlled to be turned off and the second target relay group is controlled to be turned on at the same time, at this time, the switching circuit is turned on with the second power supply, but at this time, the first field effect transistor is turned off, so that the second power supply cannot supply power to the subsequent circuit and the load device.

[0116] Further, between the second time T2 and the third time T3, the first relay group is turned off, the second relay group is turned on, the first field effect transistor is turned off, the second field effect transistor is turned off, and the PFC is turned off.

[0117] Referring to Figure 7 Between the third time T3 and the fourth time T4, the first field effect transistor and the second field effect transistor are controlled to be turned on alternately, that is, the first field effect transistor is turned on and the second field effect transistor is turned off, and the second field effect transistor is turned on and the first field effect transistor is turned off. Between the third time T3 and the fourth time T4, the first field effect transistor is turned on (the second field effect transistor is turned off) first, then the first field effect transistor is turned off and the second field effect transistor is turned on, then the first field effect transistor is turned on and the second field effect transistor is turned off, and then the first field effect transistor is turned on and the second field effect transistor is turned off.

[0118] Further, at the fourth time T4, the first field effect transistor is controlled to be turned on, the second field effect transistor is controlled to be turned off, and the power factor corrector is turned on, so as to realize that the second power supply is used to supply power to the load device, and the switching of the first power supply and the second power supply is completed.

[0119] In the embodiment of the application, the time difference between the third time T3 and the second time T2 is preset, for example, 3.5 ms. The time difference between the fourth time T4 and the third time T3 is preset, for example, 1 ms.

[0120] In the embodiment of the application, when the first power supply and the second power supply are switched, the first field effect transistor is controlled to be turned off first, and then the first relay group is controlled to be turned off. Because the first field effect transistor is turned off first in the circuit, the zero-current switching of the first relay group and the first relay group can be realized, and the stability of switching is improved.

[0121] Further, after the first power supply and the second power supply are switched, the application adopts the method of alternately turning on and off the first field effect transistor and the second field effect transistor to form a synchronous rectification Buck circuit, and controls the current of the synchronous rectification Buck circuit to control the impact current of the first capacitor and the second capacitor after the first power supply and the second power supply are switched, thereby ensuring the stability of each device (the first capacitor, the second capacitor, the first inductor and the second inductor) in the current path.

[0122] In some embodiments, the first target power supply is a preset power supply, the supply voltage of the first target power supply is a first voltage, the supply voltage of the second target power supply is a second voltage, the first voltage is greater than the second voltage, and in the case where it is detected that the first target power supply is abnormal, the switching circuit is controlled to be disconnected from the first target power supply, including one of the following:

[0123] In the case where it is detected that the first target power supply is under-voltage protection or over-voltage protection, the switching circuit is controlled to be disconnected from the first target power supply.

[0124] In the case where it is detected that the first target power supply decreases from the first voltage to the second voltage, the switching circuit is controlled to be disconnected from the first target power supply after a first time delay.

[0125] In the embodiments of the application, the preset power supply can be understood as a default power supply that is set in advance, and the preset power supply is the power supply that is first connected when the switching circuit is initially powered on.

[0126] The first voltage is higher than the second voltage, for example, the first voltage is 230V and the second voltage is 110V.

[0127] For example, the first power supply is the default power supply, the first target power supply is the first power supply, the first power supply outputs a voltage of 230V, and the second power supply can output a voltage of 110V. In one case, after detecting that the first power supply is under-voltage protection (UVP) or over-voltage protection (OVP), the first power supply is switched to the second power supply immediately, as described in Figure 7 In T0, the first power supply is detected to be under-voltage protection (UVP) or over-voltage protection (OVP), and the step of controlling the switching circuit to be disconnected from the first target power supply is performed with T0 as the first time, wherein the switching of the first power supply and the second power supply is performed immediately to protect the load device.

[0128] In another case, after detecting that the first power supply decreases from 230V to 110V, the switching circuit is controlled to be disconnected from the first target power supply after a first time delay (such as 4ms), as described in Figure 7In the case that the first power supply is detected to be abnormal at T0 (e.g., the first power supply UVP, OVP, or drops from 230V to 110V), the step of controlling the switching circuit to disconnect from the first target power supply can be performed at T0 as the first time point. In this case, the switching from the first power supply to the second power supply is performed immediately, which can protect the load device.

[0129] In some embodiments, the first target power supply is a preset power supply, and the first target power supply and the second target power supply have a second voltage. In the case that the first target power supply is detected to be abnormal, the step of controlling the switching circuit to disconnect from the first target power supply includes: in the case that the first target power supply is detected to have under-voltage protection or over-voltage protection, controlling the switching circuit to disconnect from the first target power supply.

[0130] For example, the first power supply is a default power supply, the first target power supply is the first power supply, the first power supply outputs a voltage of 230V, and the second power supply can output a voltage of 230V. In the case that the first power supply UVP, OVP, or drops from 230V to 110V is detected, the switching from the first power supply to the second power supply can be performed immediately, which is described with reference to Figure 7 In the case that the first power supply is detected to be abnormal at T0 (e.g., the first power supply UVP, OVP, or drops from 230V to 110V), the step of controlling the switching circuit to disconnect from the first target power supply can be performed at T0 as the first time point. In this case, the switching from the first power supply to the second power supply is performed immediately, which can protect the load device.

[0131] In some embodiments, the first target power supply is a preset power supply, and the first target power supply and the second target power supply have a second voltage. In the case that the first target power supply is detected to be abnormal, the step of controlling the switching circuit to disconnect from the first target power supply includes: in the case that the first target power supply is detected to have under-voltage protection or over-voltage protection, controlling the switching circuit to disconnect from the first target power supply.

[0132] For example, the first power supply is a default power supply, the first target power supply is the first power supply, the first power supply outputs a voltage of 110V, and the second power supply can output a voltage of 110V. In the case that the first power supply UVP or OVP is detected, the switching from the first power supply to the second power supply can be performed immediately, which is described with reference to Figure 7 In the case that the first power supply is detected to be abnormal at T0 (e.g., the first power supply UVP or OVP), the step of controlling the switching circuit to disconnect from the first target power supply can be performed at T0 as the first time point. In this case, the switching from the first power supply to the second power supply is performed immediately, which can protect the load device.

[0133] In some embodiments, the first target power supply is a preset power supply, and the method further includes at least one of the following:

[0134] In the case that the preset power supply is detected to be modified to the second target power supply, the switching circuit is controlled to disconnect from the first target power supply after a second time delay.

[0135] In a case that the supply voltage of the first target power supply is the second voltage and the supply voltage of the second target power supply is the first voltage, the switching circuit is controlled to be disconnected from the first target power supply, where the first voltage is greater than the second voltage.

[0136] The first target power supply is a preset power supply, and the supply voltages of the first target power supply and the second target power supply are not limited (for example, the supply voltage of the first target power supply is 230V or 110V, and the supply voltage of the second target power supply is 230V or 110V). In a case that the preset power supply is modified from the first target power supply to the second target power supply, the switching circuit is controlled to be disconnected from the first target power supply after a second time delay (for example, 4ms). Figure 8 In a case that the default power supply is modified from the first power supply to the second power supply at T0, the step of controlling the switching circuit to be disconnected from the first target power supply can be performed at T1 as the first time, which can avoid mis-switching.

[0137] In the embodiments of the present application, in a case that the supply voltage of the first target power supply is 110V and the supply voltage of the second target power supply is 230V, the switching circuit can be immediately controlled to be disconnected from the first target power supply. It can be understood that the priority of the first voltage is higher than that of the second voltage, and the first voltage is preferentially used for power supply.

[0138] In summary, in the embodiments of the present application, in a case that the supply voltages of the first power supply and the second power supply are the same (for example, both are the first voltage or both are the second voltage), the preset power supply has a higher priority. It can be understood that the preset power supply is turned on at initial power-on, and if the supply voltages of the first power supply and the second power supply are the same, the power supply is switched in a case that the preset power supply is abnormal or is modified. In addition, in a case that the supply voltages of the first power supply and the second power supply are different, the higher voltage has a higher priority. It can be understood that the preset power supply is turned on at initial power-on, and if the supply voltage of the preset power supply is less than that of the other power supply, the power supply is directly switched to the other power supply.

[0139] In summary, in the initial power-on, the power supply DSP (Digital Signal Processor) selects the first target power supply from the first power supply and the second power supply, and then turns on the first target power supply and the switching circuit. In order to reduce the inrush current, the first field effect transistor is controlled to be turned on, the main relay is turned off, and the thermistor is connected to the circuit. After the PFC is started, the main relay is controlled to be turned on, and the thermistor is bypassed. Thus, the safety of the switching circuit during the initial power-on can be realized. When switching the first power supply and the second power supply, the first field effect transistor and the second field effect transistor cooperate with the first relay group and the second relay group to be turned on or turned off. The coupling circuit and the subsequent circuit can be disconnected during the switching of the first power supply and the second power supply. The zero-current switching of the power supply during the switching moment is ensured, and the impact current during the switching moment is suppressed. The safety of the power supply switching is improved.

[0140] With reference to Figure 8 , the application further provides a power supply circuit 80, which comprises a plurality of power supply units (such as power supply units d1 to d6), each of the plurality of power supply units comprising the switching circuit described above. Each of the plurality of power supply units is connected with the first power supply and the second power supply. The first power supply or the second power supply is used to supply power to a load device through the plurality of power supply units.

[0141] In the embodiment of the application, the plurality of power supply units are connected in parallel.

[0142] It can be understood that, in Figure 3 , the power supply units d1 to d6 each comprise the switching circuit shown in Figure 1 . The power supply units d1 to d6 can be simultaneously connected with the first power supply, or the power supply units d1 to d6 can be simultaneously connected with the second power supply.

[0143] Further, the plurality of power supply units are connected with the load device, and are used to supply power to the load device.

[0144] In the embodiment of the application, since each power supply unit is connected with the first power supply and the second power supply, a large number of power supply units as shown in Figure 1 are not required, and the number of power supply units can be reduced.

[0145] For example, in Figure 1If power supply A fails, the system switches to power supply B, simultaneously switching from power supply unit a1 to power supply unit a5 to power supply unit a6 to power supply unit a10 to achieve current transmission. However, in this embodiment, if the first power supply fails, the system switches to the second power supply without needing to switch power supply units, thus reducing the number of power supply units (e.g., from...). Figure 8 The 10 was reduced to Figure 1 (Of the 6). Furthermore, in Figure 9 When any one of the power supply units a1 to a5 fails, the power supply can be switched to the B power supply, and power supply units a6 to a10 can be used for current transmission. However, in this embodiment, when any one of the power supply units d1 to d6 fails, the remaining five power supply units can be used for power supply without switching, thus improving power supply stability.

[0146] In summary, the power supply circuit provided in this application can reduce the size of the power supply circuit and improve the power supply stability. Furthermore, since the power supply circuit includes the aforementioned switching circuit, the power supply circuit provided in this application also has the technical effects of the aforementioned switching circuit.

[0147] Reference Figure 8 This application also provides a Common Redundant Power Supply (CRPS), which includes... Figure 9 The power supply circuit shown has a first terminal and a second terminal symmetrically arranged on the front window of the universal redundant power supply. The first terminal is used to connect to the first power supply, and the second terminal is used to connect to the second power supply.

[0148] The first terminal 91 and the second terminal 92 of the universal redundant power supply can be a C22 terminal (a type of terminal) or other terminals, without limitation.

[0149] In some embodiments, reference is made to Figure 9 The general-purpose redundant power supply 90 can have a standard length L of 265mm, a height H of 40mm, and a width W of 73.5mm. In addition, the general-purpose redundant power supply can also have other specifications, which are not limited.

[0150] Reference Figure 9 The general-purpose redundant power supply 90 also includes two external cable clips, such as Figure 10 The first external cable tie 95 and the second external cable tie 96 are used to organize and fix the cable harness.

[0151] Reference Figure 9 ,for Figure 10The front window of the general redundant power supply 90 is shown in FIG. 1. The first terminal 91 and the second terminal 92 are symmetrically arranged as shown in FIG. 1, which can make the first terminal and the second terminal better grounded. Figure 11

[0152] In addition, the front window can also be provided with a first signal lamp 93 and a second signal lamp 94. The first signal lamp is used to indicate the state of the power input, for example, to indicate that the power is on, the power is off, or the power is abnormal. The second signal lamp is used to indicate the state of the load device, for example, to indicate that the load device is connected, the load device is not connected, or the load device is abnormal. In addition, the first signal lamp and the second signal lamp can also indicate other contents, which are not limited herein.

[0153] In the embodiments of the present application, the first signal lamp and the second signal lamp can be arranged on one side of the front window, and in addition, can also be arranged at other positions, which are not limited herein.

[0154] Further, the general redundant power supply can also be provided with an opening on the upper part 97, the lower part (not shown in the figure) and the left side 98 of the front window of the general redundant power supply 90, so that the general redundant power supply can be better cooled. The opening can be oval, circular, rectangular or hexagonal, and the shape of the opening is not limited in the present application.

[0155] In summary, the general redundant power supply provided by the present application innovatively uses a two-terminal design on the CRPS power supply, which can connect two input power supplies (such as the first power supply and the second power supply above), so that the double-input power supply and the N (5) +1 power supply power supply circuit replace the traditional N+N redundant power supply power supply circuit, which creates favorable conditions for the space design of the general redundant power supply. At the same time, due to the significant reduction in the number of general redundant power supplies, the general redundant power supply can be independently designed with a power supply air duct, which effectively avoids the influence of the space of the general redundant power supply on the power supply fan.

[0156] Figure 11 The structure schematic diagram of the control device provided by the embodiments of the present application is shown in FIG. 2. As shown in FIG. 2, the embodiments of the present application also provide a control device. The control device 110 is used to control the switching circuit. The control device 110 can include: Figure 12

[0157] The first control module 111 is used to control the switching circuit to be connected with the first target power supply and to be disconnected with the second target power supply. The first target power supply is one of the first power supply and the second power supply, and the second target power supply is the other one of the first power supply and the second power supply.

[0158] The second control module 112 is used to control the switching circuit to be disconnected with the first target power supply and to be connected with the second target power supply in the case that the first target power supply is detected to be abnormal. ​​

[0159] Optionally, the first control module 111 is specifically configured to:

[0160] control the first target relay group corresponding to the first target power supply to be closed, the first target relay group being one of the first relay group and the second relay group;

[0161] control the first field effect transistor to be turned on, the main relay to be turned off, and the power factor corrector to be turned on;

[0162] control the main relay to be turned on.

[0163] Optionally, the second control module 112 is specifically configured to, when controlling the switching circuit to be disconnected from the first target power supply:

[0164] at a first time, control the first field effect transistor to be turned off and the power factor corrector to be turned off;

[0165] at a second time, control the first target relay group to be turned off, the second time being later than the first time.

[0166] Optionally, the second control module 112 is specifically configured to, when controlling the switching circuit to be connected to the second target power supply:

[0167] at the second time, control the second target relay group to be turned on, the second target relay group being the other one of the first relay group and the second relay group other than the first target relay group;

[0168] between a third time and a fourth time, control the first field effect transistor and the second field effect transistor to be turned on alternately, the third time being later than the second time, and the fourth time being later than the third time;

[0169] at the fourth time, control the first field effect transistor to be turned on, the second field effect transistor to be turned off, and the power factor corrector to be turned on.

[0170] Optionally, the first target power supply is a preset power supply, the power supply voltage of the first target power supply is a first voltage, the power supply voltage of the second target power supply is a second voltage, the first voltage being greater than the second voltage, and the second control module 112 is specifically configured to, when controlling the switching circuit to be disconnected from the first target power supply in the case that the first target power supply is detected to be abnormal, perform one of the following:

[0171] in the case that the first target power supply is detected to be under-voltage protection or over-voltage protection, control the switching circuit to be disconnected from the first target power supply;

[0172] in the case that the first target power supply is detected to decrease from the first voltage to the second voltage, after a first time delay, control the switching circuit to be disconnected from the first target power supply.

[0173] Optionally, the first target power supply is a preset power supply, the power supply voltage of the first target power supply is a first voltage, and the power supply voltage of the second target power supply is the first voltage. When the second control module 112 controls the switching circuit to be disconnected from the first target power supply in the case of detecting an abnormality of the first target power supply, the second control module 112 is specifically configured to control the switching circuit to be disconnected from the first target power supply in the case of detecting that the first target power supply is under-voltage protection, over-voltage protection, or the first voltage decreases to a second voltage.

[0174] Optionally, the first target power supply is a preset power supply, the power supply voltage of the first target power supply and the power supply voltage of the second target power supply are both a second voltage. When the second control module 112 controls the switching circuit to be disconnected from the first target power supply in the case of detecting an abnormality of the first target power supply, the second control module 112 is specifically configured to control the switching circuit to be disconnected from the first target power supply in the case of detecting that the first target power supply is under-voltage protection or over-voltage protection.

[0175] Optionally, the first target power supply is a preset power supply. The second control module 112 is further configured to perform at least one of the following:

[0176] In the case of detecting that the preset power supply is modified to the second target power supply, the second control module 112 controls the switching circuit to be disconnected from the first target power supply after delaying for a second time.

[0177] In the case of the power supply voltage of the first target power supply being a second voltage and the power supply voltage of the second target power supply being a first voltage, the second control module 112 controls the switching circuit to be disconnected from the first target power supply, where the first voltage is greater than the second voltage.

[0178] It should be noted that the control device shown in the embodiments of the present application can execute the technical solutions shown in the above method embodiments, and the implementation principles and beneficial effects are similar, which will not be described here in detail.

[0179] Figure 12 The structure of the electronic device provided in the present application is shown in the figure. As shown in the figure, the electronic device 120 provided in the present embodiment includes at least one processor 1201 and a memory 1202. The processor 1201 and the memory 1202 are connected through a bus. ​

[0180] In the specific implementation process, the at least one processor 1201 executes the computer execution instructions stored in the memory 1202, so that the at least one processor 1201 executes the control method embodiments described above.

[0181] The specific implementation process of the processor 1201 can be referred to the above method embodiments, and the implementation principles and technical effects are similar, which will not be described here in detail.

[0182] ​In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0183] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM). An example of the non-volatile memory is at least one disk memory.

[0184] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0185] The present application also provides a data processing system, comprising: a management process, a target process, the target process comprising a plurality of threads, the target process managing a physical memory, the physical memory comprising a direct memory and a mapping memory, the direct memory being a memory not mapped to a virtual address space, the mapping memory being a memory mapped to a virtual address space, the mapping memory being a memory mapped to a virtual address space, the data processing system being used to execute the steps of the above control method.

[0186] The embodiments of the present application also provide a computer readable storage medium, the computer readable storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above control method embodiments when running.

[0187] In an example embodiment, the computer readable storage medium described above can include, but is not limited to, a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store computer programs.

[0188] Embodiments of the present application also provide a computer program product, which comprises a computer program, and the computer program, when executed by a processor, implements the steps in any of the control method embodiments described above.

[0189] Embodiments of the present application also provide another computer program product, which comprises a non-volatile computer readable storage medium, and the non-volatile computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps in any of the control method embodiments described above.

[0190] The skilled in the art can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in the above description in a general manner. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled in the art can use different methods to implement the described functions for the specific application of the drive unit, but such implementation should not be considered beyond the scope of the present application.

[0191] The above has introduced in detail a control method provided by the present application. The principle and implementation mode of the present application have been described by applying specific examples in this paper, and the above description of the examples is only for helping to understand the method of the present application and its core idea. It should be pointed out that, for the ordinary skilled in the art, without departing from the principle of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A switching circuit, characterized by, The switching circuit comprises a control circuit, a coupling circuit, a protection circuit, a post-stage circuit, a controller, a first driving circuit and a second driving circuit, and the protection circuit comprises a first field effect transistor and a second field effect transistor, wherein: The control circuit is connected with the first power supply and the second power supply and the coupling circuit, and is configured to control the first power supply or the second power supply to be turned on or turned off with the switching circuit; The drain of the first field effect transistor is connected with the coupling circuit, and the source of the first field effect transistor is connected with the drain of the second field effect transistor and one end of the post-stage circuit; The source of the second field effect transistor is connected with the coupling circuit and the other end of the post-stage circuit; The post-stage circuit is configured to be connected with a load device, and comprises a power factor corrector and a resonant converter; The protection circuit further comprises a main relay and a thermistor, and the source of the first field effect transistor is connected with one end of the post-stage circuit through the main relay and the thermistor, and the thermistor is connected with the main relay in parallel; The controller is connected with the first driving circuit and the second driving circuit, the first driving circuit is further connected with the main relay, and the second driving circuit is further connected with the gate of the first field effect transistor and the gate of the second field effect transistor; The controller is configured to control the first driving circuit to send a driving signal to the main relay, and is further configured to control the second driving circuit to send a driving signal to the first field effect transistor and the second field effect transistor; The control circuit controls the first field effect transistor to be turned off first and then controls the corresponding first target relay group to be turned off when the power supply is switched.

2. The switching circuit of claim 1, wherein The control circuit comprises a first relay group and a second relay group, wherein: The first relay group is connected with the first power supply and the coupling circuit, and is configured to control the first power supply to be turned on or turned off with the coupling circuit; The second relay group is connected with the second power supply and the coupling circuit, and is configured to control the second power supply to be turned on or turned off with the coupling circuit.

3. The switching circuit of claim 2, wherein, The first relay group comprises a first relay, a second relay, a third relay and a fourth relay, wherein: The first relay is connected with a first output end of the first power supply, the first relay is connected with the second relay in series, and the second relay is connected with the coupling circuit; The third relay is connected with a second output end of the first power supply, the third relay is connected with the fourth relay in series, and the fourth relay is connected with the coupling circuit.

4. The switching circuit of claim 3, wherein, The second relay group comprises a fifth relay, a sixth relay, a seventh relay and an eighth relay, wherein: The fifth relay is connected with a first output end of the second power supply, the fifth relay is connected with the sixth relay in series, and the sixth relay is connected with the coupling circuit; The seventh relay is connected with a second output end of the second power supply, the seventh relay is connected in series with the eighth relay, and the eighth relay is connected with the coupling circuit.

5. The switching circuit of claim 4, wherein, The coupling circuit comprises a first capacitor, a first inductor, a second inductor and a second capacitor. A first end of the first capacitor is connected with the second relay, the sixth relay and a first end of the first inductor. A second end of the first capacitor is connected with the fourth relay, the eighth relay and a second end of the first inductor. A third end of the first inductor is connected with a first end of the second inductor, and a fourth end of the first inductor is connected with a second end of the second inductor. A third end of the second inductor is connected with a first end of the second capacitor and a drain of the first field effect transistor, and a fourth end of the second inductor is connected with a second end of the second capacitor and a source of the second field effect transistor.

6. The switching circuit of claim 5, wherein The power factor corrector is connected with the resonant converter, the thermistor, the main relay and a source of the second field effect transistor. The resonant converter is configured to be connected with the load device.

7. A control method characterized by, A method for controlling the switching circuit of claim 6, the method comprising: controlling the switching circuit to be turned on with a first target power supply and turned off with a second target power supply, the first target power supply being one of the first power supply and the second power supply, and the second target power supply being the other one of the first power supply and the second power supply; in a case where it is detected that the first target power supply is abnormal, controlling the switching circuit to be turned off with the first target power supply and turned on with the second target power supply.

8. The control method according to claim 7, characterized by The controlling the switching circuit to be turned on with the first target power supply comprises: controlling a first target relay group corresponding to the first target power supply to be closed, the first target relay group being one of the first relay group and the second relay group; controlling the first field effect transistor to be turned on, the main relay to be turned off and the power factor corrector to be turned on; controlling the main relay to be turned on.

9. The control method according to claim 8, characterized by, The controlling the switching circuit to be turned off with the first target power supply comprises: at a first time, controlling the first field effect transistor to be turned off and the power factor corrector to be turned off; at a second time, controlling the first target relay group to be turned off, the second time being later than the first time.

10. The control method according to claim 9, characterized by, The controlling the switching circuit to be turned on with the second target power supply comprises: at the second time, controlling a second target relay group to be turned on, the second target relay group being the other one of the first relay group and the second relay group other than the first target relay group; between a third time and a fourth time, controlling the first field effect transistor and the second field effect transistor to be turned on alternately, the third time being later than the second time, and the fourth time being later than the third time. At the fourth moment, the first field effect transistor is controlled to be turned on, the second field effect transistor is controlled to be turned off, and the power factor corrector is controlled to be turned on.

11. The control method according to any one of claims 7 to 10, characterized by, The first target power supply is a preset power supply, the power supply voltage of the first target power supply is a first voltage, the power supply voltage of the second target power supply is a second voltage, the first voltage is greater than the second voltage, and the control of the switching circuit and the first target power supply to be disconnected in the case that the first target power supply is detected to be abnormal includes the following one: In the case that the first target power supply is detected to be under-voltage protection or over-voltage protection, the switching circuit and the first target power supply are controlled to be disconnected. In the case that the first target power supply is detected to drop from the first voltage to the second voltage, the switching circuit and the first target power supply are controlled to be disconnected after a first time delay.

12. The control method according to any one of claims 7 to 10, characterized by, The first target power supply is a preset power supply, the power supply voltage of the first target power supply is a first voltage, the power supply voltage of the second target power supply is the first voltage, and the control of the switching circuit and the first target power supply to be disconnected in the case that the first target power supply is detected to be abnormal includes the following one: In the case that the first target power supply is detected to be under-voltage protection, over-voltage protection, or to drop from the first voltage to the second voltage, the switching circuit and the first target power supply are controlled to be disconnected.

13. The control method according to any one of claims 7 to 10, characterized by, The first target power supply is a preset power supply, and the method further includes at least one of the following: In the case that the preset power supply is detected to be modified to the second target power supply, the switching circuit and the first target power supply are controlled to be disconnected after a second time delay. In the case that the power supply voltage of the first target power supply is the second voltage and the power supply voltage of the second target power supply is the first voltage, the switching circuit and the first target power supply are controlled to be disconnected, wherein the first voltage is greater than the second voltage.

14. A power supply circuit, characterized by comprising: The plurality of power supply units include a plurality of power supply units. Each power supply unit in the plurality of power supply units includes the switching circuit of any one of claims 1 to 6. Each power supply unit in the plurality of power supply units is connected to the first power supply and the second power supply, and the first power supply or the second power supply is used to supply power to the load device through the plurality of power supply units.

15. A universal redundant power supply, comprising: The power supply circuit includes the power supply circuit of claim 14, and the first terminal and the second terminal are symmetrically arranged on the front window of the universal redundant power supply, the first terminal is used to connect the first power supply, and the second terminal is used to connect the second power supply.

16. An electronic device, comprising: The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the steps of the control method of any one of claims 7 to 13. The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the steps of the control method of any one of claims 7 to 13. The computer program is stored in the computer readable storage medium, and the computer program is executed by the processor to implement the steps of the control method of any one of claims 7 to 13.

17. A computer-readable storage medium, characterized in that, ​ 18. A computer program product comprising a computer program, characterized in that, ​

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