Power supply circuit and energy storage equipment

Abstract

The invention provides a power supply circuit and energy storage equipment, and relates to the technical field of uninterruptible power supply. The power supply circuit comprises an input circuit which is used for receiving a power supply signal; the switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first input end is electrically connected with the input circuit, and the first output end is used for supplying power to a load; the input end of the energy storage module is electrically connected with the second output end, and the output end of the energy storage module is electrically connected with the second input end; wherein the switching circuit is used for respectively conducting the first input end with the first output end and the second output end under the condition that a power supply signal is normal; and conducting the second input end and the first output end under the condition that the power supply signal is abnormal.

Description

Technical Field

[0001] This application relates to the technical field of uninterruptible power supply, and more specifically, to a power supply circuit and an energy storage device. Background Art

[0002] In the related art, the power supply circuit of a low-voltage DC system generally includes a switching power supply, a low-voltage battery, and a UPS (Uninterruptible Power Supply). Among them, the UPS can switch to power off the device through the low-voltage battery when the mains power is abnormal, providing an emergency backup power supply for the device.

[0003] In the above power supply system, the input end of the UPS is connected to the mains power. It is necessary to first convert the mains power into a DC signal suitable for charging the low-voltage battery to charge the low-voltage battery, and then convert the converted DC signal into an AC signal to be provided to the switching power supply, resulting in energy waste during the conversion process. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] To this end, a first aspect of this application proposes a power supply circuit.

[0006] A second aspect of this application proposes an energy storage device.

[0007] In view of this, a first aspect of this application provides a power supply circuit, including: an input circuit for receiving a power supply signal; a switching circuit including a first input end, a second input end, a first output end, and a second output end, where the first input end is electrically connected to the input circuit, and the first output end is used to supply power to a load; an energy storage module, where the input end of the energy storage module is electrically connected to the second output end, and the output end of the energy storage module is electrically connected to the second input end; wherein, the switching circuit is used to conduct the first input end to the first output end and the second output end respectively when the power supply signal is normal; and conduct the second input end to the first output end when the power supply signal is abnormal.

[0008] In this technical solution, the power supply circuit is used to supply power to a load. In the related art, the power supply circuit includes a UPS part, a low-voltage battery part, and a switching power supply part. The UPS part is connected to the mains power grid, the low-voltage battery, and the switching power supply.

[0009] When the mains power supply is normal, the AC / DC (alternating current / direct current) conversion module in the UPS converts the alternating current signal of the mains power into a direct current signal, charges the low-voltage battery through the direct current signal, and maintains the remaining power of the low-voltage battery. Then, the DC / AC (direct current / alternating current) conversion module converts the direct current signal back into an alternating current signal identical to the mains power and supplies it to the switching power supply.

[0010] When the mains power supply is abnormal, the UPS cuts off the loop of the AC / DC conversion module and the alternating current power supply loop. At this time, the loop of the low-voltage battery - DC / AC conversion module is connected, and the DC signal output by the low-voltage battery is converted into an alternating current signal identical to the mains power through the DC / AC conversion module and supplied to the switching power supply.

[0011] The switching power supply is always responsible for converting the alternating current signal of the mains power into a direct current signal suitable for supplying power to DC loads such as computers, servers, memories, displays, etc.

[0012] Among them, the AC / DC conversion module and the DC / AC conversion module in the UPS perform the conversion of electrical signals, and the conversion efficiency of the conversion module will not be 100%, so energy loss will occur. For example, when the mains power is supplied, in order to meet the requirements of the DC signal for charging the low-voltage battery and the input range requirements of the switching power supply, both the AC / DC conversion module and the DC / AC conversion module need to work, which causes two energy losses and results in a low conversion efficiency of the power supply circuit.

[0013] To solve the above problems, an input circuit, an energy storage module, and a switching circuit are provided in the power supply circuit of the technical solution of the present application. The input circuit is specifically used to connect to the mains power grid and receive the alternating current power supply signal output by the mains power grid. The energy storage module can store the power supply signal input by the mains power grid and temporarily supply electrical energy to the load when the mains power grid is abnormal.

[0014] The input circuit can be connected to the switching power supply, or the switching power supply is integrated in the input circuit. After the mains power signal passes through the input circuit, it is directly converted into a direct current signal suitable for supplying power to the load or charging the energy storage module.

[0015] The switching circuit can switch the power supply mode of the power supply circuit according to the state of the mains power supply signal. Specifically, when the power supply signal of the mains power grid is normal, the switching circuit conducts the input circuit and the load. At this time, the load obtains energy through the power supply signal of the mains power grid. At the same time, the switching circuit conducts the input circuit and the energy storage module, and the energy storage module is charged through the mains power grid and maintains the remaining power.

[0016] When the power supply signal of the mains power grid is abnormal, such as power outage, power grid fluctuation, power grid short circuit, etc., the switching circuit cuts off the input circuit, disconnecting the input circuit from both the energy storage module and the load, to avoid damaging the load or the energy storage module in case of voltage fluctuation, short circuit overcurrent, etc. At the same time, it switches to connect the energy storage module and the load, and the energy storage module supplies power to the load.

[0017] Exemplarily, when the voltage value of the power supply signal is greater than the high voltage threshold, or when the voltage value of the power supply signal is lower than the low voltage threshold, or when the current value of the power supply signal is greater than the high current threshold, or when the frequency of the power supply signal exceeds the frequency threshold range, it is determined that the power supply signal is abnormal.

[0018] Specifically, the switching circuit includes two input terminals and two output terminals, namely the first input terminal, the first output terminal, the second input terminal and the second output terminal. Among them, the first input terminal is electrically connected to the input circuit, and is used to receive the direct current signal after rectifying and regulating the AC power supply signal of the mains power grid. The second input terminal is electrically connected to the energy storage module, and is used to receive the direct current signal when the energy storage module discharges.

[0019] The first output terminal is electrically connected to the load, and is used to provide the direct current signal output by the input circuit or the energy storage to the backend load. The second output terminal is electrically connected to the energy storage module, and is used to charge the energy storage module with the rectified direct current signal when the power supply signal of the mains power grid is normal, and maintain the remaining power of the energy storage module for use when the mains is abnormal.

[0020] The technical solution of the present application directly provides the direct current signal to the energy storage module and the load through the switching circuit arranged at the end of the input circuit, simplifies the AC / DC conversion module and the DC / AC conversion module, reduces the system complexity, and thus reduces the failure rate and the volume of the equipment. At the same time, it can reduce the conversion loss in the power supply circuit and improve the power supply conversion efficiency of the power supply circuit.

[0021] In addition, the power supply circuit in the above technical solution provided by the present application may also have the following additional technical features:

[0022] In some technical solutions of the present application, optionally, the power supply circuit further includes: a switching power supply circuit. The input end of the switching power supply circuit is electrically connected to the output end of the input circuit, and the output end of the switching power supply circuit is electrically connected to the first input end.

[0023] In this technical solution, the power supply circuit includes a switching power supply circuit. The switching power supply circuit is arranged at the backend of the input circuit and in front of the switching circuit. The switching power supply circuit can convert the AC power supply signal of the mains power grid received by the input circuit into a direct current signal suitable for supplying power to the load and charging the energy storage module.

[0024] Specifically, the input circuit is connected to the mains power grid and receives the power supply signal from the mains power grid. The input end of the switching power supply circuit is electrically connected to the output end of the input circuit and receives the power supply signal received by the input circuit. The switching power supply circuit can filter, rectify, and perform power conversion on the AC power supply signal of the input circuit, so as to obtain a DC power signal that meets the charging requirements of the energy storage module and the working requirements of the backend load.

[0025] The switching circuit is electrically connected to the output end of the switching power supply circuit. When the power supply signal of the mains power grid is normal, the switching circuit conducts the charging circuit between the switching power supply circuit and the energy storage module, and conducts the power supply circuit between the switching power supply circuit and the load. At this time, the load operates relying on the mains power, and the energy storage module is in the charging and power preservation mode.

[0026] When the signal of the mains power grid is abnormal, the switching circuit cuts off the charging circuit between the switching power supply circuit and the energy storage module, and cuts off the power supply circuit between the power supply circuit and the load, and conducts the temporary power supply circuit between the energy storage module and the load. At this time, the load operates relying on the electric energy stored in the energy storage module, and the energy storage module is in the discharging state.

[0027] The technical solution of this application sets a switching circuit at the backend of the switching power supply circuit, and switches the power supply mode of the load through the switching circuit, eliminating the AC / DC conversion module and DC / AC conversion module in the UPS, reducing the conversion loss, and improving the conversion efficiency of the power supply circuit.

[0028] In some technical solutions of this application, optionally, the switching circuit includes: a first switching device, a first end of the first switching device is electrically connected to a first input end, and a second end of the first switching device is electrically connected to a first output end.

[0029] In this technical solution, the first switching device is arranged between the first input end and the first output end of the switching circuit, and the first switching device is specifically used to control the on / off of the power supply circuit between the switching power supply circuit or the input circuit and the load.

[0030] Specifically, when the first switching device is closed, the power supply circuit between the input circuit or the switching power supply circuit and the load is conducted, and at this time, the load is powered by the power supply signal of the mains power grid. When the first switching device is disconnected, the power supply circuit between the input circuit or the switching power supply circuit and the load is cut off. At this time, the power supply signal of the mains power grid will not affect the load. Therefore, even if faults such as overcurrent and overvoltage occur, they will not affect the load, and the safety of the load can be guaranteed.

[0031] The technical solution of this application controls the on / off of the power supply circuit between the mains power grid and the load by setting a first switching device. When the power supply signal of the mains power grid is abnormal, the first switching device is controlled to disconnect to cut off the load from the mains power grid, preventing the mains power grid failure from affecting the load and ensuring electrical safety.

[0032] In some technical solutions of this application, optionally, the switching circuit further includes: a second switching device, the first end of the second switching device is electrically connected to the first input end, and the second end of the second switching device is electrically connected to the second output end.

[0033] In this technical solution, the second switching device is disposed between the first input end and the second output end of the switching circuit, and the second switching device is specifically configured to control the on / off of the charging circuit between the switching power supply circuit or the input circuit and the energy storage module.

[0034] Specifically, when the second switching device is closed, the charging circuit between the input circuit or the switching power supply circuit and the energy storage module is conducted, and at this time, the energy storage module is charged through the power supply signal of the mains power grid, or the remaining power of the energy storage module is maintained. When the second switching device is disconnected, the charging circuit between the input circuit or the switching power supply circuit and the energy storage module is cut off, and at this time, the charging signal of the mains power grid will not affect the energy storage module. Therefore, even if faults such as overcurrent and overvoltage occur, they will not affect the energy storage module, and the equipment safety of the energy storage module can be ensured.

[0035] Exemplarily, the energy storage module may be a battery or a capacitor. Among them, the energy storage module may include a plurality of battery components connected in series or in parallel, or include a plurality of capacitor devices.

[0036] The technical solution of this application controls the on / off of the charging circuit between the mains power grid and the energy storage module by setting a second switching device. When the charging signal of the mains power grid is abnormal, the second switching device is controlled to disconnect to cut off the energy storage module from the mains power grid, preventing the energy storage module from being damaged due to the mains power grid failure and ensuring the reliability of the energy storage module.

[0037] In some technical solutions of this application, optionally, the switching circuit further includes: a third switching device, the first end of the third switching device is electrically connected to the second input end, and the second end of the third switching device is electrically connected to the first output end.

[0038] In this technical solution, the third switching device is disposed between the output end of the energy storage module and the second output end of the switching circuit, and the third switching device is specifically configured to control the on / off of the temporary power supply circuit between the energy storage module and the load.

[0039] Specifically, when the third switching device is turned off, the temporary power supply loop between the energy storage module and the load is cut off. At this time, the energy storage module will not discharge to the load, and the energy storage module is in a charging mode or maintaining the remaining power mode. The load is powered by the power supply signal of the commercial power grid or the load unit operates. When the third switching device is turned on, the temporary power supply loop between the energy storage module and the load is turned on, and at the same time, the power supply loop between the input circuit or the switching power supply circuit and the load is cut off. At this time, the load is powered by discharging the energy storage module.

[0040] The technical solution of this application controls the on / off of the temporary power supply loop between the energy storage module and the load by setting the third switching device. When the power supply signal of the commercial power grid is normal, the energy storage module is controlled to be disconnected from the load. At this time, the energy storage module does not discharge, which can reduce unnecessary charge and discharge cycles of the energy storage module and ensure the service life of the energy storage module.

[0041] In some technical solutions of this application, optionally, the switching circuit further includes: a third switching device, the first end of the third switching device is electrically connected to the second input terminal, and the second end of the third switching device is electrically connected to the first output terminal.

[0042] In this technical solution, the power supply circuit includes a control module, and the switching state of the switching device is controlled by the control module. Specifically, the control module is electrically connected to the first switching device, the second switching device, and the third switch.

[0043] Exemplarily, the switching device is a relay. The relay includes a coil and a moving switch, and the controller controls whether the coil is attracted by outputting an electrical signal to the coil.

[0044] Exemplarily, the switching device is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) switch tube, and the controller controls the on / off of the MOS switch tube by outputting a control signal to the control pin of the MOS switch tube.

[0045] The technical solution of this application controls the on / off of the switching device through the controller, thereby realizing the control of the switching circuit to switch the conduction state. When the power supply signal of the commercial power grid is normal, the load is powered by the power supply signal of the commercial power grid. When the power supply signal of the commercial power grid is abnormal, it is switched to power the load through the energy storage module, realizing uninterrupted power supply.

[0046] In some technical solutions of this application, optionally, the control module is specifically used for: when the power supply signal is normal, controlling the first switching device and the second switching device to be closed, and controlling the third switching device to be opened; or when the power supply signal is abnormal, controlling the first switching device and the second switching device to be opened, and controlling the third switching device to be closed.

[0047] In this technical solution, when the power supply signal is normal, the controller controls the first switching device to close, controls the second switching device to close, and at the same time controls the third switching state to open. At this time, the power supply loop between the input circuit or the switching power supply circuit and the load is turned on, and the charging loop between the input circuit or the switching power supply circuit and the energy storage module is also turned on. The temporary power supply loop between the energy storage module and the load is cut off. At this time, the load is powered by the power supply signal from the utility grid, and the energy storage module is charged by the power supply signal from the utility grid or the remaining power of the energy storage module is maintained.

[0048] When the power supply signal is abnormal, the controller controls the first switching device to open, controls the second switching device to open, and at the same time controls the third switching state to close. At this time, the power supply loop between the input circuit or the switching power supply circuit and the load is cut off, and the charging loop between the input circuit or the switching power supply circuit and the energy storage module is also cut off. The temporary power supply loop between the energy storage module and the load is turned on. At this time, the load is powered by the discharge of the energy storage module.

[0049] The technical solution of this application realizes uninterrupted power supply by controlling the on-off of the switching device by the controller, and there is no need to set up an AC / DC conversion module and a DC / AC conversion module, reducing the conversion loss in the power supply circuit and improving the power supply conversion efficiency of the power supply circuit.

[0050] In some technical solutions of this application, optionally, the control module is electrically connected to the energy storage module, and the control module is further configured to: obtain the remaining power of the energy storage module; and control the second switching device to close when the power supply signal is normal and the remaining power is less than the remaining power threshold; or control the second switching device to open when the power supply signal is normal and the remaining power is greater than or equal to the remaining power threshold.

[0051] In this technical solution, the control module can also obtain the remaining power of the energy storage module. Specifically, the remaining power of the energy storage module can reflect the amount of electric energy stored in the energy storage module, such as a storage battery. When the remaining power is greater than or the remaining power threshold, it means that the storage battery is fully charged. When the remaining power is less than the remaining power threshold, it means that the storage battery is not fully charged.

[0052] Specifically, when the power supply signal is normal, the second switching device is closed, and the energy storage module is charged by the DC signal output by the switching power supply circuit. The controller continuously detects the remaining power of the energy storage module. When it is detected that the remaining power of the energy storage module is greater than or equal to the remaining power threshold, the battery management system of the energy storage module itself will control the energy storage module to stop charging to prevent the process. At this time, the controller synchronously controls the second switching device to open, so that the energy storage module is in an open circuit terminal, reducing the system energy loss.

[0053] If the remaining power of the energy storage module is less than the remaining power threshold, the energy storage module remains in the charging state, and at this time, the control module keeps the second switching device closed.

[0054] The technical solution of this application can reduce the system energy loss and improve the efficiency of the power supply circuit by controlling the switch of the second switching device according to the remaining power of the energy storage module and disconnecting the second switching device after the energy storage module is fully charged.

[0055] In some technical solutions of this application, optionally, the first switching device, the second switching device, and the third switching device include: a relay, a switching tube, or an air circuit breaker.

[0056] In this technical solution, the switching devices, including the first switching device, the second switching device, and the third switching device, can be relays. Exemplarily, the relays include electromagnetic relays, solid-state relays, or reed relays, etc.

[0057] The switching device can also be a switching tube. Exemplarily, the switching tube includes a MOS switching tube, an IGBT (Insulated Gate Bipolar Transistor) switching tube, or a triode.

[0058] The switching device can also be an air circuit breaker.

[0059] The technical solution of this application can control the switching circuit to switch the power supply state of the load by setting the switching device, which can achieve uninterrupted power supply and ensure power consumption safety.

[0060] The second aspect of this application provides an energy storage device, which includes the power supply circuit provided in any of the above technical solutions, and thus also includes all the beneficial effects of the power supply circuit provided in any of the above technical solutions. To avoid repetition, it will not be elaborated here.

[0061] Exemplarily, the energy storage device is a photovoltaic energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The above and / or additional aspects and advantages of this application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0063] Figure 1 The circuit diagram of the power supply circuit showing some embodiments of this application is shown;

[0064] Figure 2 The circuit diagram of the switching circuit showing some embodiments of this application is shown.

[0065] Reference Signs:

[0066] 100 Power supply circuit, 102 Input circuit, 104 Switching circuit, 1042 First switching device, 1044 Second switching device, 1046 Third switching device, 106 Energy storage module, 108 Switching power supply circuit, 110 Control module;

[0067] 202 First input terminal, 204 Second input terminal, 206 First output terminal, 208 Second output terminal. Detailed implementation manners

[0068] In order to be able to more clearly understand the above objects, features, and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0069] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0070] The following refers to Figure 1 and Figure 2 Describe the energy storage circuit and energy storage device according to some embodiments of the present application.

[0071] In some embodiments of the present application, a power supply circuit is provided. Figure 1 The circuit diagram of the power supply circuit according to some embodiments of the present application is shown. Figure 2 The circuit diagram of the switching circuit according to some embodiments of the present application is shown. As Figure 1 and Figure 2 shown, the power supply circuit 100 includes: an input circuit 102 for receiving a power supply signal; a switching circuit 104 including a first input terminal 202, a second input terminal 204, a first output terminal 206, and a second output terminal 208. The first input terminal 202 is electrically connected to the input circuit 102, and the first output terminal 206 is used to supply power to a load; an energy storage module 106, the input terminal of the energy storage module 106 is electrically connected to the second output terminal 208, and the output terminal of the energy storage module 106 is electrically connected to the second input terminal 204; wherein, the switching circuit is used to conduct the first input terminal 202 to the first output terminal 206 and the second output terminal 208 respectively when the power supply signal is normal; and conduct the second input terminal 204 to the first output terminal 206 when the power supply signal is abnormal.

[0072] In this embodiment, the power supply circuit is used to supply power to a load. In the related art, the power supply circuit includes a UPS part, a low-voltage battery part, and a switching power supply part. The UPS part is connected to the mains power grid, the low-voltage battery, and the switching power supply.

[0073] When the mains power supply is normal, the AC / DC conversion module in the UPS converts the AC signal of the mains power supply into a DC signal, charges the low-voltage battery through the DC signal, and maintains the remaining power of the low-voltage battery. Then, the DC / AC conversion module converts the DC signal back into an AC signal identical to the mains power supply and provides it to the switching power supply.

[0074] When the mains power supply is abnormal, the UPS cuts off the loop of the AC / DC conversion module and the AC power supply loop. At this time, the loop of the low-voltage battery - DC / AC conversion module is connected, and the DC signal output by the low-voltage battery is converted into an AC signal identical to the mains power supply through the DC / AC conversion module and provided to the switching power supply.

[0075] The switching power supply is always responsible for converting the AC signal of the mains power supply into a DC signal suitable for powering DC loads such as computers, servers, memories, displays, etc.

[0076] Among them, the AC / DC conversion module and the DC / AC conversion module in the UPS perform the conversion of electrical signals, and the conversion efficiency of the conversion module will not be 100%, so energy loss will occur. For example, when the mains power supply is on, in order to meet the requirements of the DC signal for charging the low-voltage battery and the input range requirements of the switching power supply, both the AC / DC conversion module and the DC / AC conversion module need to work, which causes two energy losses and results in low conversion efficiency of the power supply circuit.

[0077] Regarding the above problems, as Figure 1 shown, the power supply circuit 100 of the embodiment of the present application is provided with an input circuit 102, an energy storage module 106, and a switching circuit 104. The input circuit 102 is specifically used to connect to the mains power grid and receive the AC power supply signal output by the mains power grid. The energy storage module 106 can store the power supply signal input by the mains power grid and temporarily provide electrical energy to the load when the mains power grid is abnormal.

[0078] Among them, the input circuit 102 can be connected to the switching power supply, or the switching power supply is integrated in the input circuit 102, and the mains power signal is directly converted into a DC signal suitable for powering the load or charging the energy storage module 106 after passing through the input circuit 102.

[0079] The switching circuit 104 can switch the power supply mode of the power supply circuit 100 according to the state of the mains power supply signal. Specifically, when the power supply signal of the mains power grid is normal, the switching circuit 104 conducts the input circuit 102 and the load. At this time, the load obtains energy through the power supply signal of the mains power grid. At the same time, the switching circuit 104 conducts the input circuit 102 and the energy storage module 106, and the energy storage module 106 is charged through the mains power grid and maintains the remaining power.

[0080] When the power supply signal of the commercial power grid is abnormal, such as in the case of power outage, power grid fluctuation, power grid short - circuit, etc., the switching circuit 104 cuts off the input circuit 102, disconnecting the input circuit 102 from both the energy storage module 106 and the load, to avoid damaging the load or the energy storage module 106 in the case of voltage fluctuation, short - circuit over - current, etc. At the same time, it switches to connect the energy storage module 106 and the load, and the energy storage module 106 supplies power to the load.

[0081] Exemplarily, when the voltage value of the power supply signal is greater than the high - voltage threshold, or when the voltage value of the power supply signal is lower than the low - voltage threshold, or when the current value of the power supply signal is greater than the high - current threshold, or when the frequency of the power supply signal exceeds the frequency threshold range, it is determined that the power supply signal is abnormal.

[0082] Specifically, the switching circuit 104 includes two input terminals and two output terminals, namely the first input terminal 202, the first output terminal 206, the second input terminal 204, and the second output terminal 208. Among them, the first input terminal 202 is electrically connected to the input circuit 102 and is used to receive the direct - current signal after rectifying and regulating the AC power supply signal of the commercial power grid. The second input terminal 204 is electrically connected to the energy storage module 106 and is used to receive the direct - current signal when the energy storage module 106 discharges.

[0083] The first output terminal 206 is electrically connected to the load and is used to provide the direct - current signal output by the input circuit 102 or the energy storage to the backend load. The second output terminal 208 is electrically connected to the energy storage module 106 and is used to charge the energy storage module 106 with the rectified direct - current signal when the power supply signal of the commercial power grid is normal, and maintain the remaining power of the energy storage module 106 for use when the commercial power is abnormal.

[0084] In the embodiment of the present application, by setting the switching circuit 104 at the end of the input circuit 102, the direct - current signal is directly provided to the energy storage module 106 and the load, streamlining the AC / DC conversion module and the DC / AC conversion module, reducing the system complexity, and thus reducing the failure rate and the volume of the device. At the same time, it can reduce the conversion loss in the power supply circuit 100 and improve the power supply conversion efficiency of the power supply circuit 100.

[0085] In some embodiments of the present application, optionally, as Figure 1 shown, the power supply circuit 100 further includes: a switching power supply circuit 108. The input end of the switching power supply circuit 108 is electrically connected to the output end of the input circuit 102, and the output end of the switching power supply circuit 108 is electrically connected to the first input terminal 202.

[0086] In this embodiment, the power supply circuit 100 includes a switching power supply circuit 108. The switching power supply circuit 108 is arranged at the rear end of the input circuit 102 and at the front end of the switching circuit 104. The switching power supply circuit 108 can convert the AC power supply signal of the commercial power grid received by the input circuit 102 into a DC power signal suitable for supplying power to the load and charging the energy storage module 106.

[0087] Specifically, the input circuit 102 is connected to the commercial power grid and receives the power supply signal of the commercial power grid. The input end of the switching power supply circuit 108 is electrically connected to the output end of the input circuit 102 and receives the power supply signal received by the input circuit 102. The switching power supply circuit 108 can perform filtering, rectification, and power conversion processing on the AC power supply signal of the input circuit 102, so as to obtain a DC power signal that meets the charging requirements of the energy storage module 106 and the working requirements of the rear-end load.

[0088] The switching circuit 104 is electrically connected to the output end of the switching power supply circuit 108. When the power supply signal of the commercial power grid is normal, the switching circuit 104 conducts the charging circuit between the switching power supply circuit 108 and the energy storage module 106, and conducts the power supply circuit between the switching power supply circuit 108 and the load. At this time, the load operates relying on the commercial power, and the energy storage module 106 is in the charging and power preservation mode.

[0089] When the signal of the commercial power grid is abnormal, the switching circuit 104 cuts off the charging circuit between the switching power supply circuit 108 and the energy storage module 106, and cuts off the power supply circuit between the power supply circuit 100 and the load, and conducts the temporary power supply circuit between the energy storage module 106 and the load. At this time, the load operates relying on the electric energy stored in the energy storage module 106, and the energy storage module 106 is in the discharging state.

[0090] In the embodiment of the present application, by arranging the switching circuit 104 at the rear end of the switching power supply circuit 108 and switching the power supply mode of the load through the switching circuit 104, the AC / DC conversion module and DC / AC conversion module in the UPS are eliminated, the conversion loss is reduced, and the conversion efficiency of the power supply circuit 100 is improved.

[0091] In some embodiments of the present application, optionally, as Figure 1 shown, the switching circuit 104 includes: a first switching device 1042. The first end of the first switching device 1042 is electrically connected to the first input end 202, and the second end of the first switching device 1042 is electrically connected to the first output end 206.

[0092] In this embodiment, the first switching device 1042 is arranged between the first input end 202 and the first output end 206 of the switching circuit 104. The first switching device 1042 is specifically used to control the on / off of the power supply circuit between the switching power supply circuit 108 or the input circuit 102 and the load.

[0093] Specifically, when the first switching device 1042 is closed, the power supply loop between the input circuit 102 or the switching power supply circuit 108 and the load is turned on, and at this time, the power supply signal from the commercial power grid supplies power to the load. When the first switching device 1042 is turned off, the power supply loop between the input circuit 102 or the switching power supply circuit 108 and the load is cut off, and at this time, the power supply signal from the commercial power grid will not affect the load. Therefore, even if faults such as overcurrent and overvoltage occur, they will not affect the load, and the safety of the load can be ensured.

[0094] In the embodiment of the present application, by setting the first switching device 1042 to control the on / off of the power supply loop between the commercial power grid and the load, when the power supply signal of the commercial power grid is abnormal, the first switching device 1042 is controlled to be turned off to cut off the load from the commercial power grid, preventing the commercial power grid fault from affecting the load and ensuring the power consumption safety.

[0095] In some embodiments of the present application, optionally, as Figure 1 shown, the switching circuit 104 further includes: a second switching device 1044, a first end of the second switching device 1044 is electrically connected to the first input end 202, and a second end of the second switching device 1044 is electrically connected to the second output end 208.

[0096] In this embodiment, the second switching device 1044 is arranged between the first input end 202 and the second output end 208 of the switching circuit 104, and the second switching device 1044 is specifically used to control the on / off of the charging loop between the switching power supply circuit 108 or the input circuit 102 and the energy storage module 106.

[0097] Specifically, when the second switching device 1044 is closed, the charging loop between the input circuit 102 or the switching power supply circuit 108 and the energy storage module 106 is turned on, and at this time, the power supply signal from the commercial power grid charges the energy storage module 106 or maintains the remaining power of the energy storage module 106. When the second switching device 1044 is turned off, the charging loop between the input circuit 102 or the switching power supply circuit 108 and the energy storage module 106 is cut off, and at this time, the charging signal from the commercial power grid will not affect the energy storage module 106. Therefore, even if faults such as overcurrent and overvoltage occur, they will not affect the energy storage module 106, and the equipment safety of the energy storage module 106 can be ensured.

[0098] Exemplarily, the energy storage module 106 may be a battery or a capacitor. Among them, the energy storage module 106 may include a plurality of battery components connected in series or in parallel, or include a plurality of capacitor devices.

[0099] In the embodiment of the present application, the charging circuit between the mains power grid and the energy storage module 106 is controlled by setting the second switching device 1044. When the charging signal of the mains power grid is abnormal, the second switching device 1044 is controlled to disconnect to cut off the energy storage module 106 from the mains power grid, preventing the energy storage module 106 from being damaged due to mains power grid faults and ensuring the reliability of the energy storage module 106.

[0100] In some embodiments of the present application, optionally, as Figure 1 shown, the switching circuit 104 further includes: a third switching device 1046, a first end of the third switching device 1046 is electrically connected to the second input terminal 204, and a second end of the third switching device 1046 is electrically connected to the first output terminal 206.

[0101] In this embodiment, the third switching device 1046 is disposed between the output terminal of the energy storage module 106 and the second output terminal 208 of the switching circuit 104. The third switching device 1046 is specifically configured to control the on / off of the temporary power supply circuit between the energy storage module 106 and the load.

[0102] Specifically, when the third switching device 1046 is disconnected, the temporary power supply circuit between the energy storage module 106 and the load is cut off. At this time, the energy storage module 106 does not discharge to the load, and the energy storage module 106 is in a charging or maintaining the remaining power mode, and the load is powered by the power supply signal of the mains power grid or the load part operates. When the third switching device 1046 is closed, the temporary power supply circuit between the energy storage module 106 and the load is turned on, and at the same time, the power supply circuit between the input circuit 102 or the switching power supply circuit 108 and the load is cut off. At this time, the load is powered by discharging the energy storage module 106.

[0103] In the embodiment of the present application, the third switching device 1046 is set to control the on / off of the temporary power supply circuit between the energy storage module 106 and the load. When the power supply signal of the mains power grid is normal, the energy storage module 106 is controlled to be disconnected from the load. At this time, the energy storage module 106 does not discharge, which can reduce unnecessary charge and discharge cycles of the energy storage module 106 and ensure the service life of the energy storage module 106.

[0104] In some embodiments of the present application, optionally, as Figure 1 shown, the switching circuit 104 further includes: a third switching device 1046, a first end of the third switching device 1046 is electrically connected to the second input terminal 204, and a second end of the third switching device 1046 is electrically connected to the first output terminal 206.

[0105] In this embodiment, the power supply circuit 100 includes a control module 110, and the switching state of the switching device is controlled through the control module 110. Specifically, the control module 110 is electrically connected to the first switching device 1042, the second switching device 1044, and the third switch.

[0106] Exemplarily, the switching device is a relay, which includes a coil and a moving switch. The controller controls whether the coil is attracted by outputting an electrical signal to the coil.

[0107] Exemplarily, the switching device is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) switch tube. The controller controls the on / off of the MOS switch tube by outputting a control signal to the control pin of the MOS switch tube.

[0108] In the embodiment of the present application, the controller controls the on / off of the switching device, thereby realizing the control of the switching circuit 104 to switch the conduction state. When the power supply signal of the commercial power is normal, the load is powered by the power supply signal of the commercial power. When the power supply signal of the commercial power is abnormal, the power supply is switched to the energy storage module 106 to supply power to the load, realizing uninterrupted power supply.

[0109] In some embodiments of the present application, optionally, the control module 110 is specifically configured to: when the power supply signal is normal, control the first switching device 1042 and the second switching device 1044 to be closed, and control the third switching device 1046 to be opened; or when the power supply signal is abnormal, control the first switching device 1042 and the second switching device 1044 to be opened, and control the third switching device 1046 to be closed.

[0110] In this embodiment, when the power supply signal is normal, the controller controls the first switching device 1042 to be closed, controls the second switching device 1044 to be closed, and at the same time controls the third switching state to be opened. At this time, the power supply loop between the input circuit 102 or the switching power supply circuit 108 and the load is conducting, and the charging loop between the input circuit 102 or the switching power supply circuit 108 and the energy storage module 106 is also conducting. The temporary power supply loop between the energy storage module 106 and the load is cut off. At this time, the load is powered by the power supply signal of the commercial power grid, and the energy storage module 106 is charged by the power supply signal of the commercial power grid or the remaining power of the energy storage module 106 is maintained.

[0111] When the power supply signal is abnormal, the controller controls the first switching device 1042 to be opened, controls the second switching device 1044 to be opened, and at the same time controls the third switching state to be closed. At this time, the power supply loop between the input circuit 102 or the switching power supply circuit 108 and the load is cut off, and the charging loop between the input circuit 102 or the switching power supply circuit 108 and the energy storage module 106 is also cut off. The temporary power supply loop between the energy storage module 106 and the load is conducting. At this time, the load is powered by the discharge of the energy storage module 106.

[0112] In the embodiment of the present application, by controlling the on / off of the switching device through the controller, uninterrupted power supply is achieved, and there is no need to set up an AC / DC conversion module and a DC / AC conversion module, reducing the conversion loss in the power supply circuit 100 and improving the power supply conversion efficiency of the power supply circuit 100.

[0113] In some embodiments of the present application, optionally, the control module 110 is electrically connected to the energy storage module 106, and the control module 110 is further configured to: obtain the remaining power of the energy storage module 106; and control the second switching device 1044 to close when the power supply signal is normal and the remaining power is less than the remaining power threshold; or control the second switching device 1044 to open when the power supply signal is normal and the remaining power is greater than or equal to the remaining power threshold.

[0114] In this embodiment, the control module 110 can also obtain the remaining power of the energy storage module 106. Specifically, the remaining power of the energy storage module 106 can reflect the amount of electrical energy stored in the energy storage module 106, such as a battery. When the remaining power is greater than or the remaining power threshold, it means that the battery is fully charged. When the remaining power is less than the remaining power threshold, it means that the battery is not fully charged.

[0115] Specifically, when the power supply signal is normal, the second switching device 1044 is closed, and the energy storage module 106 is charged through the DC signal output by the switching power supply circuit 108. The controller continuously detects the remaining power of the energy storage module 106. When it is detected that the remaining power of the energy storage module 106 is greater than or equal to the remaining power threshold, the battery management system of the energy storage module 106 itself will control the energy storage module 106 to stop charging to prevent overcharging. At this time, the controller synchronously controls the second switching device 1044 to open, so that the energy storage module 106 is in an open circuit terminal, reducing the system energy loss.

[0116] If the remaining power of the energy storage module 106 is less than the remaining power threshold, the energy storage module 106 remains in the charging state, and at this time the control module 110 keeps the second switching device 1044 in the closed state.

[0117] In the embodiment of the present application, by controlling the switch of the second switching device 1044 according to the remaining power of the energy storage module 106 and opening the second switching device 1044 after the energy storage module 106 is fully charged, the system energy loss can be reduced and the efficiency of the power supply circuit 100 can be improved.

[0118] In some embodiments of the present application, optionally, the first switching device 1042, the second switching device 1044, and the third switching device 1046 include: a relay, a switching tube, or an air circuit breaker.

[0119] In this embodiment, the switching devices, including the first switching device 1042, the second switching device 1044, and the third switching device 1046, may be relays. Exemplarily, the relays include electromagnetic relays, solid-state relays, or reed relays, etc.

[0120] The switching devices may also be switching tubes. Exemplarily, the switching tubes include MOS switching tubes, IGBT (Insulated Gate Bipolar Transistor) switching tubes, or triodes.

[0121] The switching devices may also be air-break switches.

[0122] In the embodiment of the present application, by setting the switching devices to control the switching circuit 104 to switch the power supply state of the load, uninterrupted power supply can be achieved, and power consumption safety can be ensured.

[0123] The second aspect of the present application provides an energy storage device, which includes the power supply circuit provided in any of the above embodiments, and thus also includes all the beneficial effects of the power supply circuit provided in any of the above embodiments. To avoid repetition, they will not be described herein again.

[0124] Exemplarily, the energy storage device is a photovoltaic energy storage device.

[0125] The methods may be implemented in various different ways according to specific features and / or example applications. For example, these methods may be implemented by a combination of hardware, firmware, and / or software. For example, in a hardware implementation, the processor may be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, electronic devices, other device units for performing the above functions, and / or combinations thereof.

[0126] A computer-readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer-readable storage medium can be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing devices, without limitation. A non-exhaustive list of more specific examples of the computer-readable storage medium includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital versatile disks (DVDs), memory cards, floppy disks, encoding mechanical devices (such as punched cards or grooves with raised structures having instructions recorded thereon), and any suitable combination of the foregoing devices. The computer-readable storage medium used herein should not be construed as a signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium, or an electrical signal transmitted through a wire, etc.

[0127] In the description of the present application, the term "a plurality" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0128] In the description of the present application, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0129] The foregoing is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that, Comprising: An input circuit for receiving a power supply signal; A switching circuit including a first input terminal, a second input terminal, a first output terminal and a second output terminal, wherein the first input terminal is electrically connected to the input circuit, and the first output terminal is used for supplying power to a load; An energy storage module, the input end of the energy storage module is electrically connected to the second output terminal, and the output end of the energy storage module is electrically connected to the second input terminal; Wherein, the switching circuit is configured to conduct the first input terminal to the first output terminal and the second output terminal respectively when the power supply signal is normal; and conduct the second input terminal to the first output terminal when the power supply signal is abnormal.

2. The power supply circuit according to claim 1, wherein Further comprising: A switching power supply circuit, the input end of the switching power supply circuit is electrically connected to the output end of the input circuit, and the output end of the switching power supply circuit is electrically connected to the first input terminal.

3. The power supply circuit according to claim 1 or 2, characterized in that, The switching circuit includes: A first switching device, a first end of the first switching device is electrically connected to the first input terminal, and a second end of the first switching device is electrically connected to the first output terminal.

4. The power supply circuit according to claim 3, wherein, The switching circuit further includes: A second switching device, a first end of the second switching device is electrically connected to the first input terminal, and a second end of the second switching device is electrically connected to the second output terminal.

5. The power supply circuit according to claim 4, characterized in that, The switching circuit further includes: A third switching device, a first end of the third switching device is electrically connected to the second input terminal, and a second end of the third switching device is electrically connected to the first output terminal.

6. The power supply circuit according to claim 5, wherein Further comprising: A control module electrically connected to the first switching device, the second switching device and the third switching device respectively, for controlling the switching of the first switching device, the second switching device and the third switching device.

7. The power supply circuit according to claim 6, characterized in that, The control module is specifically configured to: When the power supply signal is normal, control the first switching device and the second switching device to close, and control the third switching device to open; or When the power supply signal is abnormal, control the first switching device and the second switching device to open, and control the third switching device to close.

8. The power supply circuit according to claim 6, wherein The control module is electrically connected to the energy storage module, and the control module is further configured to: Obtain the remaining power of the energy storage module; and When the power supply signal is normal and the remaining power is less than the remaining power threshold, control the second switching device to close; or When the power supply signal is normal and the remaining power is greater than or equal to the remaining power threshold, control the second switching device to open.

9. The power supply circuit according to claim 7, wherein The first switching device, the second switching device and the third switching device include: Relays, switching tubes or air circuit breakers.

10. An energy storage device, characterized in that, Comprising: The power supply circuit according to any one of claims 1 to 9.

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