Power supply circuits, energy storage devices, and electronic equipment

Abstract

The present application belongs to the field of power supply technology and provides a power supply circuit, an energy storage device and an electronic device. A first control circuit is set to detect the input power of the input interface circuit and the output power of the output interface circuit in real time, and output a first control signal and a first indication signal when the input power of the input interface circuit does not meet the required power of the AC device connected to the output interface circuit. The AC / DC conversion circuit converts the DC power on the DC bus into AC power at a first preset conversion power according to the first control signal and outputs it to the output interface circuit. The second control circuit controls the DC / DC according to the first indication signal to convert the DC power output by the battery module into AC power at a second preset conversion power and then output it to the DC bus, thereby realizing rapid switching of power supply between the first control circuit and the second control circuit through the first indication signal, thereby solving the problem of slow switching speed of the current energy storage device when switching the power supply circuit.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to a power supply circuit, an energy storage device, and an electronic device. Background Art

[0002] When the energy storage device is working in the uninterruptible power supply (UPS) state, it is necessary to detect the input source to switch the battery module of the energy storage device to supply power to the outside according to the input power situation, or to charge the battery module of the energy storage device according to the input power.

[0003] However, in related technologies, when energy storage devices switch battery modules according to the input power supply and connected load conditions, they need to detect various parameters and switch software and hardware, resulting in a slow switching time and unable to meet the demand for fast switching. Summary of the Invention

[0004] In order to solve the above technical problems, the embodiments of the present application provide a power supply circuit, an energy storage device, and an electronic device, which can solve the problem of slow switching speed of the energy storage device when switching the power supply circuit.

[0005] A first aspect of an embodiment of the present application provides a power supply circuit, the power supply circuit comprising an AC / DC conversion circuit, a DC / DC conversion circuit, a first control circuit, a second control circuit, an input interface circuit, and an output interface circuit;

[0006] The input end of the input interface circuit is used to connect to an AC power source, and the output end of the input interface circuit is connected to a first end of the AC / DC conversion circuit; the input end of the output interface circuit is connected to the first end of the AC / DC conversion circuit, and the output end of the output interface circuit is used to connect to an AC device; the second end of the AC / DC conversion circuit is connected to the first end of the DC / DC conversion circuit via a DC bus, and the second end of the DC / DC conversion circuit is used to connect to a battery module;

[0007] a first control circuit, connected to the input interface circuit, the output interface circuit, and the AC / DC conversion circuit, respectively, and configured to, upon detecting that the input power of the input interface circuit does not meet the power requirement of the AC device connected to the output interface circuit, output a first control signal to the AC / DC conversion circuit and output a first instruction signal to the second control circuit, wherein the first control signal is configured to instruct the AC / DC conversion circuit to change from a charging state to a discharging state and to convert the DC power on the DC bus into AC power according to a first preset conversion power and output the converted power to the output interface circuit;

[0008] A second control circuit is connected to the DC / DC conversion circuit and the first control circuit, respectively, and is used to output a second control signal to the DC / DC conversion circuit when receiving the first indication signal, wherein the second control signal is used to control the DC / DC conversion circuit to change from a charging state to a discharging state, and convert the DC power output by the battery module into a voltage according to a second preset conversion power and then output it to the DC bus.

[0009] In one embodiment, the power supply circuit further includes:

[0010] a main control circuit, connected to the AC / DC conversion circuit and the DC / DC conversion circuit, respectively, for generating a third control signal based on the input power, the required power, and the output power of the AC / DC conversion circuit, and sending the third control signal to the AC / DC conversion circuit and the DC / DC conversion circuit, wherein the third control signal is used to control the conversion power of the AC / DC conversion circuit and the DC / DC conversion circuit to meet the required power of the AC device connected to the output interface circuit.

[0011] In one embodiment, the third control signal is a pulse width modulation signal;

[0012] The main control circuit is further configured to adjust the duty cycle and frequency of the third control signal according to the input power, the required power, and the output power of the AC / DC conversion circuit, so that the sum of the input power and the output power of the AC / DC conversion circuit is the required power.

[0013] In one embodiment, the main control circuit is further configured to:

[0014] When it is detected that the input power of the input interface circuit is greater than the required power of the AC device connected to the output interface circuit, the charging power is determined according to the difference between the input power and the required power, a charging signal is generated according to the charging power, and the charging signal is sent to the AC / DC conversion circuit and the DC / DC conversion circuit to instruct the AC / DC conversion circuit and the DC / DC conversion circuit to enter a charging state.

[0015] In one embodiment, the first control circuit is further configured to output a second indication signal to the second control circuit when determining that the AC / DC conversion circuit enters a charging state, wherein the second indication signal is configured to indicate that the AC / DC conversion circuit is currently in a charging state.

[0016] In one embodiment, the second control circuit is further used to obtain the bus voltage of the DC bus, and output a second control signal to the DC / DC conversion circuit when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range.

[0017] In one embodiment, the second control circuit is further used to obtain the bus voltage of the DC bus, and output a second control signal to the DC / DC conversion circuit when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range and receives the first indication signal.

[0018] In one embodiment, the main control circuit is further used to: generate a standby signal when the input power is equal to the required power, and send the standby signal to the AC / DC conversion circuit and the DC / DC conversion circuit to put the AC / DC conversion circuit and the DC / DC conversion circuit into a standby state.

[0019] A second aspect of an embodiment of the present application further provides an energy storage device, comprising a battery module and a power supply circuit as described in any one of the above items.

[0020] A third aspect of the embodiments of the present application further provides an electronic device, comprising a power supply circuit as described in any one of the above items.

[0021] Beneficial effects of the embodiments of the present application:

[0022] A first control circuit is provided to detect the input power of the input interface circuit and the output power of the output interface circuit in real time. When it is detected that the input power of the input interface circuit does not meet the power requirement of the AC device connected to the output interface circuit, a first control signal is output to the AC / DC conversion circuit and a first indication signal is output to the second control circuit. The first control signal is used to instruct the AC / DC conversion circuit to change from a charging state to a discharging state, and convert the DC power on the DC bus into AC power according to a first preset conversion power and output it to the output interface circuit. When the second control circuit receives the first indication signal, it outputs a second control signal to the DC / DC conversion circuit. The second control signal is used to control the DC / DC conversion circuit to change from a charging state to a discharging state, and convert the DC power output by the battery module into AC power according to a second preset conversion power before outputting it to the DC bus. In this way, rapid power supply switching can be achieved between the first control circuit and the second control circuit only by the first indication signal, solving the problem of slow switching speed when switching power supply circuits of energy storage devices. At the same time, the AC / DC conversion circuit and the DC / DC conversion perform power conversion according to the preset conversion power, which can quickly meet the power requirements of the AC device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0024] Figure 2 is a structural diagram of a power supply circuit provided by another embodiment of the present application;

[0025] Figure 3 Schematic diagram of the structure of a battery module provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0027] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means one or more, unless otherwise specifically defined.

[0030] Energy storage devices are portable power systems that can charge load devices within the power supply system or connect to an external power source. However, the power provided by the external power source may not guarantee long-term stable power supply to the power user. In this case, when the energy storage device is operating in an uninterruptible power supply (UPS) state, it is necessary to detect the input source and switch the energy storage device's battery module to provide external power or charge the energy storage device's battery module according to the input power supply to ensure the normal operation of the power user.

[0031] In related technologies, when energy storage devices switch battery modules according to input power and connected load conditions, they need to detect various parameters and switch software and hardware, resulting in a slow switching time that cannot meet the demand for fast switching.

[0032] In order to solve the above technical problems, the present application provides a power supply circuit. Figure 1 As shown, the power supply circuit in this embodiment includes an AC / DC conversion circuit 300 , a DC / DC conversion circuit 400 , a first control circuit 110 , a second control circuit 120 , an input interface circuit 210 and an output interface circuit 220 .

[0033] Specifically, the input end of the input interface circuit 210 is used to connect to an AC power source, and the output end of the input interface circuit 210 is connected to a first end of the AC / DC converter circuit 300. The input end of the output interface circuit 220 is connected to a first end of the AC / DC converter circuit 300, and the output end of the output interface circuit 220 is used to connect to an AC device. The second end of the AC / DC converter circuit 300 is connected to a first end of the DC / DC converter circuit 400 via a DC bus, and the second end of the DC / DC converter circuit 400 is connected to the battery module 500. The first control circuit 110 is connected to the input interface circuit 210, the output interface circuit 220, and the AC / DC converter circuit 300, respectively. The second control circuit 120 is connected to the DC / DC converter circuit 400 and the first control circuit 110, respectively.

[0034] The first control circuit 110 is used to output a first control signal to the AC / DC conversion circuit 300 and a first indication signal to the second control circuit 120 when it detects that the input power of the input interface circuit 210 does not meet the required power of the AC device connected to the output interface circuit 220. The first control signal is used to instruct the AC / DC conversion circuit 300 to change from a charging state to a discharging state, and convert the DC power on the DC bus into AC power according to the first preset conversion power and output it to the output interface circuit 220. The second control circuit 120 is used to output a second control signal to the DC / DC conversion circuit 400 when receiving the first indication signal. The second control signal is used to control the DC / DC conversion circuit 400 to change from a charging state to a discharging state, and convert the DC power output by the battery module 500 into AC power according to the second preset conversion power and output it to the DC bus.

[0035] In this embodiment, the first control circuit 110 transmits a first instruction signal to the second control circuit 120 to achieve signal interaction between the first control circuit 110 and the second control circuit 120. This allows the first control circuit 110 to control the AC / DC conversion circuit 300 from a charging state to a discharging state while the second control circuit 120 simultaneously controls the DC / DC conversion circuit 400 from a charging state to a discharging state, thereby quickly switching the power supply circuit mode and reducing the time required for power supply switching. In this embodiment of the present application, the first control circuit 110 and the second control circuit 120 exchange signals only through the first instruction signal, thereby achieving rapid switching of the power supply state. When the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 switch to the discharging state, they each perform power conversion according to the rated conversion power. This allows them to quickly output the rated power when the AC power supply does not meet the power requirement of the AC device to ensure the normal operation of the AC device.

[0036] In one embodiment, the first indication signal may be a level signal, which may be transmitted via a port connected between the first control circuit 110 and the second control circuit 120. For example, when the first indication signal is at a high level, the AC / DC conversion circuit 300 switches from a charging state to a discharging state, and the DC / DC conversion circuit 400 switches from a charging state to a discharging state. The DC / DC conversion circuit 400 converts the DC power output by the battery module 500 into a voltage according to the second preset conversion power and outputs it to the DC bus. The AC / DC conversion circuit 300 converts the DC power on the DC bus into AC power according to the first preset conversion power and outputs it to the output interface circuit 220. In this embodiment, by setting the first indication signal as a level signal and transmitting the first indication signal via a port connected between the first control circuit 110 and the second control circuit 120, rapid switching of power supply states can be achieved.

[0037] In one embodiment, the second preset conversion power is greater than or equal to the first preset conversion power.

[0038] In this embodiment, by setting the second preset conversion power to be greater than or equal to the first preset conversion power, the problem of insufficient output power when the AC / DC conversion circuit 300 converts DC power on the DC bus into AC power can be avoided, thereby ensuring the stability of the power supply circuit.

[0039] In one embodiment, see Figure 2 As shown, the power supply circuit in this embodiment further includes a main control circuit 600 .

[0040] The main control circuit 600 is connected to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 respectively. The main control circuit 600 is used to generate a third control signal based on the input power, the required power of the AC device and the output power of the AC / DC conversion circuit 300, and send the third control signal to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400. The third control signal is used to control the conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to meet the required power of the AC device connected to the output interface circuit 220.

[0041] In this embodiment, the main control circuit 600 calculates the conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 based on the input power, the required power, and the output power of the AC / DC conversion circuit 300, so that the conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 can meet the power requirement of the AC device. In this embodiment of the present application, the first control circuit 110 controls the AC / DC conversion circuit 300 to perform power conversion according to a first preset conversion power, and the second control circuit 120 controls the DC / DC conversion circuit 400 to perform power conversion according to a second preset conversion power. After that, the AC / DC conversion circuit 300 outputs the corresponding power to the AC device connected to the output interface circuit 220. At this point, although the AC device can operate normally, the sum of the power provided by the AC power source connected to the input interface circuit 210 and the output power of the AC / DC conversion circuit 300 may be greater than or less than the power requirement of the AC device. In the embodiment of the present application, the first control circuit 110 and the second control circuit 120 are only used to quickly switch the operating states of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 when the power supply circuit is in the bypass operating mode, and to control the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to convert according to the preset conversion power. Therefore, after the operating states of the AC / DC 300 and the DC / DC conversion circuit 400 are switched and they operate according to the preset conversion power, the main control circuit 600 further adjusts the conversion power of the AC / DC conversion circuit and the DC / DC conversion circuit based on the power provided by the AC power source, the output power of the AC / DC conversion circuit 300, and the power required by the AC device, so that the sum of the input power provided by the AC power source and the output power of the AC / DC conversion circuit 300 is equal to the power required by the AC device. It should be noted that during this process, the power provided by the AC power supply may increase or decrease, and the main control circuit will control the conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to decrease or increase.

[0042] In one embodiment, the third control signal is a pulse width modulation signal, and the main control circuit 600 is further configured to adjust the duty cycle and frequency of the third control signal according to the input power, the required power, and the output power of the AC / DC conversion circuit 300, so that the sum of the input power and the output power of the AC / DC conversion circuit 300 is the required power.

[0043] In this embodiment, the AC / DC converter circuit 300 may be an inverter circuit composed of multiple switching transistors, and the operating state of the AC / DC converter circuit 300 is switched by adjusting the switching state of the switching transistors. In this embodiment of the present application, the main control circuit 600 outputs a third control signal to the control terminal of the switching transistor (e.g., an IGBT or MOS transistor) in the AC / DC converter circuit 300. The main control circuit 600 adjusts the output power of the AC / DC converter circuit 300 by setting the duty cycle and frequency of the third control signal so that the sum of the input power and the output power equals the required power, thereby preventing the output power of the AC / DC converter circuit 300 from being too high or too low, thereby preventing the AC device connected to the output interface circuit 220 from malfunctioning or damaging the device.

[0044] In one embodiment, the main control circuit 600 is further used to determine the charging power based on the difference between the input power and the required power when it detects that the input power of the input interface circuit 210 is greater than the required power of the AC device connected to the output interface circuit 220, generate a charging signal based on the charging power, and send the charging signal to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to instruct the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to enter the charging state.

[0045] In this embodiment, if the input power of the input interface circuit 210 is greater than the required power of the AC device connected to the output interface circuit 220, the main control circuit 600 first calculates the power difference between the input power and the required power, and then determines the charging power of the battery module 500 based on the power difference, and generates a charging signal based on the charging power and outputs it to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400, so that the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 enter the charging state, thereby achieving the purpose of charging the battery module 500, and avoiding the problem of input power waste caused by the low required power of the AC device.

[0046] In one embodiment, the first control circuit 110 is further configured to output a second indication signal to the second control circuit 120 when determining that the AC / DC conversion circuit 300 enters the charging state. The second indication signal is configured to indicate that the AC / DC conversion circuit 300 is currently in the charging state.

[0047] In this embodiment, if the main control circuit 600 determines that the input power of the input interface circuit 210 is greater than the required power of the AC device connected to the output interface circuit 220, the main control circuit 600 outputs a charging signal to the AC / DC conversion circuit 300, switches the working state of the AC / DC conversion circuit 300 to the charging state, and simultaneously outputs a second indication signal to the second control circuit 120. The second indication signal is used to indicate to the second control circuit 120 that the AC / DC conversion circuit 300 is in the charging state.

[0048] In one embodiment, both the first indication signal and the second indication signal may be level signals, and the first indication signal and the second indication signal may be transmitted via a connection port between the first control circuit 110 and the second control circuit 120. For example, the first indication signal may be at a high level, and the second indication signal may be at a low level. The first indication signal is used to indicate that the AC / DC conversion circuit 300 is currently in a discharging state, and the second indication signal is used to indicate that the AC / DC conversion circuit 300 is currently in a charging state. By flipping the level of the connection port between the first control circuit 110 and the second control circuit 120, the second control circuit 120 can quickly and in real time learn the state of the AC / DC conversion circuit 300 and quickly enter a switching state.

[0049] In one embodiment, when the main control circuit 600 outputs a corresponding third control signal based on the input power, the required power, and the output power of the AC / DC conversion circuit 300, the first control circuit 110 stops outputting the first control signal to the AC / DC conversion circuit 300, and the second control circuit 120 stops outputting the second control signal to the DC / DC conversion circuit 400. The conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 is controlled by the main control circuit 600. The third control signal may include multiple pulse-width modulation signals, which are output one-to-one to the control terminals of the switching transistors in the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400. By controlling the switching frequencies of the switching transistors in the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400, the conversion power of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 are adjusted in real time. Therefore, even when the input power fluctuates uncertainly, the required power of the AC device can be met at any time, thereby avoiding the problem of unstable power supply caused by input power fluctuations.

[0050] In one embodiment, when the main control circuit 600 outputs a corresponding third control signal based on the input power, the required power, and the output power of the AC / DC conversion circuit 300, if the AC / DC conversion circuit 300 receives both the first control signal and the third control signal, the AC / DC conversion circuit 300 adjusts its conversion power based on the third control signal so that the conversion power adapts to the required power of the AC device connected to the output interface circuit 220. In the embodiment of the present application, the AC / DC conversion circuit 300 includes an inverter circuit composed of multiple switching transistors (e.g., IGBTs, MOS transistors), and both the third control signal and the first control signal may include multiple pulse-width modulation signals, which are output to the control terminals of the multiple switching transistors in the AC / DC conversion circuit 300 in a one-to-one correspondence. However, the priority of the third control signal is greater than the priority of the first control signal. If the AC / DC conversion circuit 300 receives both the first control signal and the third control signal, the AC / DC conversion circuit 300 blocks the first control signal, and the internal switching transistors are turned on and off based on the third control signal.

[0051] In one embodiment, when the main control circuit 600 outputs a corresponding third control signal based on the input power, the required power, and the output power of the AC / DC conversion circuit 300, if the DC / DC conversion circuit 400 receives both the second control signal and the third control signal, the DC / DC conversion circuit 400 adjusts its conversion power based on the third control signal so that the conversion power adapts to the required power of the AC device connected to the output interface circuit 220. In this embodiment of the present application, both the third control signal and the second control signal may include multiple pulse-width modulation signals, and the multiple pulse-width modulation signals are output to the control terminals of multiple switching transistors in the DC / DC conversion circuit 400 in a one-to-one correspondence. However, the priority of the third control signal is greater than the priority of the second control signal. If the DC / DC conversion circuit 400 receives both the second control signal and the third control signal, the DC / DC conversion circuit 400 blocks the second control signal, and the internal switching transistors are turned on and off based on the third control signal.

[0052] In one embodiment, the second control circuit 120 is also used to obtain the bus voltage of the DC bus, and output a second control signal to the DC / DC conversion circuit 400 when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range.

[0053] In this embodiment, when the second control circuit 120 detects that the bus voltage of the DC bus drops from the first preset voltage range to the second preset voltage range within a preset time range, it indicates that the power output from the AC / DC conversion circuit 300 to the DC / DC conversion circuit 400 begins to drop. At this time, in order to prevent the power of the output interface circuit 220 from dropping too quickly, a second control signal is output to the DC / DC conversion circuit 400, so that the DC / DC conversion circuit 400 changes from a charging state to a discharging state, and the DC power output by the battery module 500 is converted into a voltage according to the second preset conversion power and then output to the DC bus, thereby avoiding the problem of abnormal operation of the electrical equipment caused by the power of the output interface circuit 220 dropping too quickly.

[0054] In one embodiment, the second control circuit 120 is also used to obtain the bus voltage of the DC bus, and when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range and receives a first indication signal, output a second control signal to the DC / DC conversion circuit 400.

[0055] In this embodiment, when the second control circuit 120 detects that the bus voltage of the DC bus drops from the first preset voltage range to the second preset voltage range within a preset time range, it indicates that the power output from the AC / DC conversion circuit 300 to the DC / DC conversion circuit 400 begins to drop. When the first control circuit 110 detects that the input power of the input interface circuit 210 does not meet the power requirement of the AC device connected to the output interface circuit 220, it outputs a first indication signal to the second control circuit 120. At this time, the input power of the input interface circuit 210 is no longer able to meet the power requirement of the AC device. In order to prevent the power of the output interface circuit 220 from dropping too quickly, the second control signal is output to the DC / DC conversion circuit 400. 400, so that the DC / DC conversion circuit 400 changes from a charging state to a discharging state. At this time, the first control circuit 110 has controlled the AC / DC conversion circuit 300 to change from a charging state to a discharging state. The DC / DC conversion circuit 400 converts the DC power output by the battery module 500 into a voltage according to the second preset conversion power and outputs it to the DC bus. Through the level conversion of the common end between the first control circuit 110 and the second control circuit 120 (converted from the second indication signal to the first indication signal), the working states of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 are quickly switched, thereby avoiding the problem that the power of the output interface circuit 220 drops too quickly, causing abnormal operation of the electrical equipment.

[0056] In one embodiment, when the AC / DC conversion circuit 300 is in a discharging state and converts the DC power on the DC bus into AC power and outputs it to the AC device, the first control circuit 110 sends a first indication signal to the second control circuit 120. The first indication signal is used to indicate that the AC / DC conversion circuit 300 is in a discharging state. When the AC / DC conversion circuit 300 is in a charging state and converts the AC power of the input interface circuit 210 into DC power and outputs it to the DC bus, the first control circuit 110 sends a second indication signal to the second control circuit 120. The second indication signal is used to indicate that the AC / DC conversion circuit 300 is in a charging state. The first indication signal and the second indication signal are level signals, and their levels are opposite.

[0057] In one embodiment, the first indication signal and the second indication signal are transmitted via a signal interface between the first control circuit 110 and the second control circuit 120. The first indication signal can be at a high level, and the second indication signal can be at a low level. When the signal interface between the first control circuit 110 and the second control circuit 120 undergoes a level flip, from a low level to a high level. At this point, the second control circuit 120 detects that the AC / DC converter circuit 300 is in a discharging state based on the high level of the signal interface. If the bus voltage on the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range, it indicates that the input power of the input interface circuit 210 cannot meet the sum of the required power of the AC device and the charging power of the battery module 500. At this point, a second control signal can be output to the DC / DC converter circuit 400, so that when the input power source and the power consumption status of the AC device change, the operating state of the DC / DC converter circuit 400 is quickly switched, thereby meeting the power supply requirements of the power supply circuit that require rapid switching when the power consumption status changes. In one embodiment, the first preset voltage range can be 380V-420V, for example, the first preset voltage is 380V.

[0058] In one embodiment, the preset time range may be 0.5-1 second.

[0059] In one embodiment, the second preset voltage range may be 350V-370V, for example, the second preset voltage is 370V.

[0060] In one embodiment, the main control circuit 600 is also used to generate a standby signal when the input power is equal to the required power, and send the standby signal to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 to put the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 into a standby state.

[0061] In this embodiment, if the input power of the input interface circuit 210 is equal to the required power of the AC device connected to the output interface circuit 220, the main control circuit 600 outputs a standby signal to the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400. At this time, the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 enter the standby state, thereby reducing the power consumption of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400.

[0062] In specific applications, in order to achieve rapid switching of the power supply circuit, the first control circuit 110 and the second control circuit 120 only interact through high and low levels (that is, the first indication signal and the second indication signal are high level signals or low level signals), and no other data information interaction is involved.

[0063] In one embodiment, the first control circuit 110 and the second control circuit 120 can be control circuits composed only of switching tubes. For example, when a power outage is detected, a preset discharge program is first entered. The discharge program is pre-set and is used to control the AC / DC conversion circuit 300 or the DC / DC conversion circuit 400 to output rated power.

[0064] An embodiment of the present application further provides an energy storage device, comprising a battery module 500 and a power supply circuit as described above.

[0065] In this embodiment, the battery module 500 is connected to the output interface circuit 220 through the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400. At this time, the battery module 500 and the input interface circuit 210 both serve as power supply branches of the output interface circuit 220. The first control circuit 110 and the second control circuit 120 determine the working status of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 according to the input power of the input interface circuit 210 and the required power of the AC device connected to the output interface circuit 220, and determine the control of charging, discharging and standby of the battery module 500.

[0066] In one embodiment, see Figure 3 As shown, the battery module 500 includes a first switch S1, a second switch S2, a first diode D1, a second diode D2 and a battery module BAT.

[0067] Specifically, the DC / DC conversion circuit 400 is connected to the power management system (BMS) in the battery module 500 through the first positive terminal P+ and the first negative terminal P-. The first switch S1, the second switch S2, the first diode D1, and the second diode D2 constitute the power management system. The first end of the first switch S1 and the anode of the first diode D1 are commonly connected to the positive electrode B+ of the battery module BAT, the second end of the first switch S1, the cathode of the first diode D1, the cathode of the second diode D2, and the first end of the second switch S2 are commonly connected, the anode of the second diode D2 and the second end of the second switch S2 are commonly connected to the first positive terminal P+, and the negative electrode B- of the battery module BAT is connected to the first negative terminal P-.

[0068] In this embodiment, the main control circuit 600 can control the charging, discharging, and standby switching of the battery module BAT by controlling the switching states of the first switch S1 and the second switch S2. For example, when charging the battery module BAT, the first switch S1 can be controlled to be closed and the second switch S2 can be controlled to be opened. In this case, the battery module BAT is pre-charged. Then, when the voltage at the first positive terminal P+ is detected to be greater than the voltage at the positive terminal B+, both the first switch S1 and the second switch S2 are controlled to be closed to charge the battery module BAT. When the battery module BAT needs to be discharged, the first switch S1 can be controlled to be opened and the second switch S2 to be closed. In this case, the battery module BAT is pre-discharged. When the voltage at the first positive terminal P+ is detected to be less than the voltage at the positive terminal B+, both the first switch S1 and the second switch S2 are controlled to be closed to discharge the battery module BAT. When both the first switch S1 and the second switch S2 are controlled to be opened, the battery module BAT is in the standby state.

[0069] In one embodiment, the first switch S1 and the second switch S2 may be switching devices such as relays or MOS transistors.

[0070] An embodiment of the present application further provides an electronic device, which includes a power supply circuit as described above.

[0071] In this embodiment, by setting up a power supply circuit in the electronic device, after the electronic device is connected to the AC power supply, the AC power supply and the battery module 500 can be flexibly switched as the power supply to power the AC device connected to the output interface circuit 220.

[0072] In one embodiment, the electronic device may be composed of an AC power supply, a battery module 500 and a power supply circuit as described in any of the above embodiments.

[0073] Specifically, the input end of the input interface circuit 210 is used to connect to an AC power supply, and the output end of the input interface circuit 210 is connected to a first end of the AC / DC conversion circuit 300; the input end of the output interface circuit 220 is connected to a first end of the AC / DC conversion circuit 300, and the output end of the output interface circuit 220 is used to connect to an AC device.

[0074] In this embodiment, by applying the power supply circuit to the power supply system, the stability of the power supply system and the switching speed of the power supply branch can be improved. For example, the first control circuit 110 and the second control circuit 120 can precisely control the operating state of the AC / DC conversion circuit 300 and the DC / DC conversion circuit 400 by simply interacting with each other through high and low levels (i.e., the first indication signal and the second indication signal are high level signals or low level signals), thereby significantly avoiding the problem of unstable output power caused by power fluctuations in the input interface circuit 210.

[0075] In a specific application, the AC / DC conversion circuit 300 is connected to a target device (e.g., an AC device) through an output interface circuit 220. The target device includes an AC input device or an AC power-consuming device. The AC input device is connected to the AC / DC conversion circuit 300 through a network port (e.g., input interface circuit 210) or an external interface.

[0076] In bypass mode, if the output interface circuit 220 is connected to a load, and the input power of the grid-connected port or external interface can meet the power demand of the load connected to the output interface circuit 220, the external interface or the grid-connected port directly supplies power to the load connected to the output interface circuit 220 (UPS mode). If the input power of the external interface or the grid-connected port exceeds the power demand of the output interface circuit 220, and if the battery module 500 connected to the DC / DC converter circuit 400 requires power, the main control circuit 600 will control the AC / DC converter circuit 300 and the DC / DC converter circuit 400 to operate, so that the excess power can be used to charge the battery module 500.

[0077] The beneficial effects of the embodiments of the present application are as follows: by setting a first control circuit to detect the input power of the input interface circuit and the output power of the output interface circuit in real time, and when it is detected that the input power of the input interface circuit does not meet the required power of the AC device connected to the output interface circuit, a first control signal is output to the AC / DC conversion circuit, and a first indication signal is output to the second control circuit. The first control signal is used to instruct the AC / DC conversion circuit to change from a charging state to a discharging state, and convert the DC power on the DC bus into AC power according to a first preset conversion power and output it to the output interface circuit. When the second control circuit receives the first indication signal, it outputs a second control signal to the DC / DC conversion circuit. The second control signal is used to control the DC / DC conversion circuit to change from a charging state to a discharging state, and convert the DC power output by the battery module into a voltage according to a second preset conversion power and then output it to the DC bus. Therefore, fast power switching can be achieved between the first control circuit and the second control circuit only through the first indication signal, thereby solving the problem of slow switching speed when switching power supply circuits in current energy storage devices.

[0078] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0079] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power supply circuit, characterized in that: The power supply circuit includes an AC / DC conversion circuit, a DC / DC conversion circuit, a first control circuit, a second control circuit, a main control circuit, an input interface circuit and an output interface circuit; The input end of the input interface circuit is used to connect to an AC power source, and the output end of the input interface circuit is connected to a first end of the AC / DC conversion circuit; the input end of the output interface circuit is connected to the first end of the AC / DC conversion circuit, and the output end of the output interface circuit is used to connect to an AC device; the second end of the AC / DC conversion circuit is connected to the first end of the DC / DC conversion circuit via a DC bus, and the second end of the DC / DC conversion circuit is used to connect to a battery module; The first control circuit is connected to the input interface circuit, the output interface circuit, and the AC / DC conversion circuit, respectively, and is configured to output a first control signal to the AC / DC conversion circuit and a first instruction signal to the second control circuit when detecting that the input power of the input interface circuit does not meet the power requirement of the AC device connected to the output interface circuit. The first control signal is configured to instruct the AC / DC conversion circuit to change from a charging state to a discharging state and to convert the DC power on the DC bus into AC power according to a first preset conversion power and output it to the output interface circuit. the second control circuit being connected to the DC / DC conversion circuit and the first control circuit, respectively, and configured to output a second control signal to the DC / DC conversion circuit upon receiving the first indication signal, wherein the second control signal is configured to control the DC / DC conversion circuit to change from a charging state to a discharging state, and to convert the DC power output by the battery module into a voltage according to a second preset conversion power and then output the voltage to the DC bus; The main control circuit is connected to the AC / DC conversion circuit and the DC / DC conversion circuit, respectively, and is used to generate a third control signal according to the input power, the required power, and the output power of the AC / DC conversion circuit, and send the third control signal to the AC / DC conversion circuit and the DC / DC conversion circuit, wherein the third control signal is used to control the conversion power of the AC / DC conversion circuit and the DC / DC conversion circuit to meet the required power of the AC device connected to the output interface circuit; The main control circuit is further configured to, when detecting that the input power of the input interface circuit is greater than the required power of the AC device connected to the output interface circuit, determine the charging power based on the difference between the input power and the required power, generate a charging signal based on the charging power, and send the charging signal to the AC / DC conversion circuit and the DC / DC conversion circuit to instruct the AC / DC conversion circuit and the DC / DC conversion circuit to enter a charging state.

2. The power supply circuit according to claim 1, wherein: The third control signal is a pulse width modulation signal; The main control circuit is further configured to adjust the duty cycle and frequency of the third control signal according to the input power, the required power, and the output power of the AC / DC conversion circuit, so that the sum of the input power and the output power of the AC / DC conversion circuit is the required power.

3. The power supply circuit according to claim 1, wherein: The first control circuit is further configured to output a second indication signal to the second control circuit when determining that the AC / DC conversion circuit enters a charging state, wherein the second indication signal is configured to indicate that the AC / DC conversion circuit is currently in a charging state.

4. The power supply circuit according to any one of claims 1 to 3, characterized in that: The second control circuit is further configured to obtain the bus voltage of the DC bus, and output the second control signal to the DC / DC conversion circuit when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range.

5. The power supply circuit according to claim 4, characterized in that: The second control circuit is also used to obtain the bus voltage of the DC bus, and when the bus voltage of the DC bus drops from a first preset voltage range to a second preset voltage range within a preset time range and receives the first indication signal, output the second control signal to the DC / DC conversion circuit.

6. The power supply circuit according to claim 1, wherein: The main control circuit is further configured to generate a standby signal when the input power is equal to the required power, and send the standby signal to the AC / DC conversion circuit and the DC / DC conversion circuit to put the AC / DC conversion circuit and the DC / DC conversion circuit into a standby state.

7. An energy storage device, characterized in that: The device comprises a battery module and a power supply circuit according to any one of claims 1 to 6.

8. An electronic device, characterized in that: The power supply circuit comprises the power supply circuit according to any one of claims 1 to 6.

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