Power supply circuit and energy storage device

Abstract

The utility model discloses a power supply circuit and an energy storage device. An alternating current input interface and an alternating current output interface of the power supply circuit are electrically connected to form a first branch, the alternating current input interface, a first AC / DC conversion module, a second AC / DC conversion module and the alternating current output interface are electrically connected in sequence to form a second branch, and the alternating current input interface is used for being connected with an external alternating current power supply; under the condition that the external alternating current power supply is available, the first branch is used for outputting electric energy through the alternating current output interface by utilizing the external alternating current power supply; the second branch circuit is used for outputting electric energy to the alternating current output interface by the external alternating current power supply under the condition that the external alternating current power supply is available, and the second branch circuit is used for outputting the electric energy to the alternating current output interface by the battery module through the conversion module under the condition that the external alternating current power supply is unavailable. According to the power supply circuit, the power supply circuit can simultaneously realize the functions of an online UPS (Uninterrupted Power Supply) and a backup UPS, so that the flexibility of the power supply circuit is good, and the power supply circuit is suitable for different load requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, in particular to a power supply circuit and energy storage equipment. Background Art

[0002] An uninterruptible power system (UPS) is a device that continuously supplies power to a load. A UPS typically consists of a rectifier, an inverter, and a battery pack. UPSs include backup UPSs and online UPSs.

[0003] In an online UPS, power is supplied to the load via an inverter. This type of UPS offers stable output, but powering the load through the inverter involves power loss. In a backup UPS, power is supplied directly from an external AC power source when the input power is normal; when the input power is interrupted, power is supplied by a battery module. This type of UPS has a simple structure and low cost, but the output voltage is less stable and requires switching time.

[0004] However, a single online UPS or backup UPS cannot adapt to the requirements of different loads, resulting in poor UPS flexibility and inability to meet user needs in different scenarios. Utility Model Content

[0005] The embodiments of the present invention provide a power supply circuit and an energy storage device to solve at least one of the above-mentioned technical problems.

[0006] A power supply circuit according to an embodiment of the present invention includes an AC input interface, a first AC / DC conversion module, a second AC / DC conversion module, and an AC output interface, wherein the AC input interface is used to connect to an external AC power source, the first AC / DC conversion module and the second AC / DC conversion module are used to connect to a battery module, the AC input interface and the AC output interface are electrically connected to form a first branch, and the AC input interface, the first AC / DC conversion module, the second AC / DC conversion module, and the AC output interface are electrically connected in sequence to form a second branch;

[0007] The first branch is used to output electric energy through the AC output interface using the external AC power supply when the external AC power supply is available;

[0008] The second branch is used for, when the external AC power source is available, the external AC power source to output electric energy to the AC output interface through the second branch, and / or;

[0009] The second branch is used to output electric energy to the AC output interface by using the battery module through the second AC / DC conversion module when the external AC power source is available or unavailable.

[0010] The above-mentioned power supply circuit can enable the external AC power supply to output power to the AC output interface or charge the battery module when the external AC power supply is available, and regardless of whether the external AC power supply is available or unavailable, the battery module can be used to output power to the AC output interface. In this way, the power supply circuit can simultaneously realize the functions of online UPS and backup UPS, thereby making the power supply circuit flexible and suitable for different load requirements.

[0011] In some embodiments, the AC output interface includes a first AC output interface and a second AC output interface, the AC input interface is connected to the first AC output interface to form the first branch, and the AC input interface, the first AC / DC conversion module, the second AC / DC conversion module and the second AC output interface are electrically connected in sequence to form the second branch.

[0012] In certain embodiments, the first AC / DC conversion module includes a first AC / DC sub-conversion module and a first DC / DC conversion module connected to the first AC / DC sub-conversion module, the second AC / DC conversion module includes a second AC / DC sub-conversion module and a second DC / DC conversion module connected to the second AC / DC sub-conversion module, the first AC / DC sub-module is connected to the AC input interface, the second AC / DC conversion module is connected to the second AC input interface, and the first DC / DC module and the second DC / DC module are connected to each other and to the battery module.

[0013] In some embodiments, the power supply circuit further includes a first switch, the AC input interface is connected to the first AC / DC conversion module and the second AC / DC conversion module, the first switch is arranged between the first AC / DC sub-conversion module and the second AC / DC sub-conversion module, and the first switch is used to control the connection or disconnection of the first AC / DC sub-conversion module and the second AC / DC sub-conversion module. When the first switch is connected, the AC input interface inputs two-phase electricity, and power is supplied to the battery module through the first AC / DC conversion module and the second AC / DC conversion module.

[0014] In some embodiments, the power supply circuit further includes a second switch, which is disposed between the first AC output interface and the second AC output interface and is configured to connect or disconnect the first AC output interface and the second AC output interface. When the second switch is turned on, the first AC output interface and the second AC output interface are simultaneously powered by the AC input interface.

[0015] In some embodiments, when the second switch is turned on, one of the first branch and the second branch is turned on, and the other is turned off.

[0016] In some embodiments, the power supply circuit also includes a third AC output interface, the AC input interface includes: a first live wire terminal and a second live wire terminal, the third AC output interface includes a third live wire terminal and a fourth live wire terminal, when the battery module supplies power to the third AC output interface, the third live wire terminal is connected to the first AC / DC module, and the fourth live wire terminal is connected to the second AC / DC module; when the AC input interface supplies power to the third AC output interface, the first live wire terminal is connected to the third live wire terminal, and the second live wire terminal is connected to the fourth live terminal.

[0017] In some embodiments, the second branch is used to charge the battery module using the second branch when the external AC power source is available.

[0018] In certain embodiments, the power supply circuit includes a control module, and the control module is configured to control the operating states of the first AC / DC conversion module, the second AC / DC conversion module, and the battery module according to user instructions.

[0019] An energy storage device according to an embodiment of the present invention includes the power supply circuit according to any one of the above embodiments.

[0020] The above-mentioned energy storage device, when an external AC power supply is available, can enable the external AC power supply to output power to the AC output interface or charge the battery module, and regardless of whether the external AC power supply is available or unavailable, the battery module can be used to output power to the AC output interface. In this way, the power supply circuit can simultaneously realize the functions of online UPS and backup UPS, thereby making the power supply circuit flexible and suitable for different load requirements.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments with reference to the following drawings, in which:

[0023] Figures 1 to 11 is a circuit diagram of a power supply circuit according to an embodiment of the present utility model;

[0024] Figure 12 It is a module schematic diagram of the energy storage device according to the embodiment of the present utility model.

[0025] Description of main component symbols:

[0026] Power supply circuit 10, AC input interface 12, first AC / DC conversion module 14a, second AC / DC conversion module 14b, AC output interface 16, first AC output interface 16a, second AC output interface 16b, battery module 18, first branch 20, second branch 22, first switch 24, second switch 26, first AC / DC sub-conversion module 28, first DC / DC conversion module 30, second AC / DC sub-conversion module 32, second DC / DC conversion module 34, control module 36, energy storage device 100. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0032] UPS (Uninterruptible Power System) is a device that can continuously supply power to the load.

[0033] A UPS typically consists of the following components: a rectifier, inverter, battery pack, and input interface. When the UPS's external AC power input is normal, it supplies power to the load through the rectifier and inverter. If the UPS's external AC power input fails, the battery pack uses its stored energy to supply power to the load through the inverter, ensuring normal output.

[0034] UPS can be divided into backup UPS and online UPS.

[0035] In an online UPS, the inverter is always in operation, supplying power to the load regardless of whether the input power is normal or not. This type of UPS offers stable output, but powering the load through the inverter has a capacity loss, making it suitable for loads with high power quality requirements.

[0036] In a backup UPS, when the input power is normal, it is powered directly by an external AC power source. When the input power is interrupted, the battery module provides inverter power. This UPS has a simple structure and low cost, but the output voltage stability is poor and there is a switching time. It is suitable for loads that are not sensitive to output voltage and switching time.

[0037] However, depending on the type of load, there may be different requirements for the type of UPS. A single online UPS or backup UPS cannot adapt to the requirements of different loads, resulting in poor UPS flexibility and inability to meet user needs in different scenarios.

[0038] See also Figure 1 and Figure 2 The power supply circuit 10 provided in an embodiment of the present invention includes an AC input interface 12, a first AC / DC (Alternating Current / Direct Current) conversion module 14a, a second AC / DC conversion module 14b, and an AC output interface 16. The AC input interface 12 is used to connect to an external AC power source. The first AC / DC conversion module 14a and the second AC / DC conversion module 14b are used to connect to a battery module 18. The AC input interface 12 and the AC output interface 16 are electrically connected to form a first branch 20. The AC input interface 12, the first AC / DC conversion module 14a, the second AC / DC conversion module 14b, and the AC output interface 16 are electrically connected in sequence to form a second branch 22.

[0039] The first branch 20 is used to output electrical energy through the AC output interface 16 using the external AC power supply when the external AC power supply is available;

[0040] The second branch 22 is used for the external AC power supply to output power to the AC output interface 16 through the second branch 22 when the external AC power supply is available, and / or;

[0041] The second branch 22 is used to output power to the AC output interface 16 via the second AC / DC conversion module 14 b using the battery module 18 when the external AC power source is available or unavailable.

[0042] In the above-mentioned power supply circuit 10, when the external AC power supply is available, the external AC power supply can output electrical energy to the AC output interface 16 or charge the battery module 18, and regardless of whether the external AC power supply is available or unavailable, the battery module 18 can be used to output electrical energy to the AC output interface 16. In this way, the power supply circuit 10 can simultaneously realize the functions of an online UPS and a backup UPS, thereby making the power supply circuit 10 flexible and suitable for different load requirements.

[0043] Specifically, the power supply circuit 10 includes an AC input interface 12, a first AC / DC conversion module 14a, a second AC / DC conversion module 14b, and an AC output interface 16. Optionally, the power supply circuit 10 can be used in an energy storage device 100, a power supply device, or other electronic devices with internal rechargeable batteries.

[0044] The AC input interface 12 is used to be electrically connected to an external AC power source. The conversion module 14 is connected to a battery module 18 that can supply power.

[0045] The AC input interface 12 is connected to the first AC output interface 16a and, via the first conversion module 14a and the second conversion module 14b, to the second AC output interface 16b. The first AC / DC conversion module 14a and the second AC / DC conversion module 14b are configured to convert AC power input from an external AC power source into DC power to charge the battery module 18. The first AC / DC conversion module 14a and the second AC / DC conversion module 14b are also configured to convert DC power provided by the battery module 18 into AC power to power the AC output interface 16.

[0046] The AC output interface 16 is connected to a load, and the external AC power supply and the battery module 18 supply power to the load through the AC output interface 16 .

[0047] When an external AC power source is available, the external AC power input can supply power to the AC output interface 16 through the first branch 20 . At the same time, the external AC power input can also charge the battery module 18 through the first AC / DC conversion module 14 a .

[0048] At this time, if the external AC power supply is disconnected, the first branch 20 is powered off, the battery module 18 is switched from charging mode to discharging mode, and the first AC / DC conversion module 14a is switched from the rectification mode of AC-DC conversion to the inverter mode of DC-AC conversion. This process requires a certain time interval. For the load end, the power supply is suspended for a period of time. At this time, the power supply circuit 10 can realize the function of a backup UPS.

[0049] When an external AC power source is available, the battery module 18 can also supply power to the AC output interface 16 through the second AC / DC conversion module 14 b , or the battery module 18 and the external AC power source can jointly supply power to the AC output interface 16 .

[0050] In this case, even if the external AC power supply is cut off, as long as the output power of the battery module 18 is greater than or equal to the required power of the load and the battery module 18 has sufficient power, the battery module 18 can continue to supply power to the load, and the second AC / DC conversion module 14b is always in the AC-DC conversion process, without the need for a time interval, and can achieve 0ms (milliseconds) to power the load. At this time, the power supply circuit 10 can realize the function of an online UPS.

[0051] It should be noted that when the battery module 18 and the external AC power supply jointly supply power to the AC output interface 16 and the external AC power supply is the AC power input, the output of the battery module 18 needs to be processed so that it is connected to the AC power grid, so that the battery module 18 and the AC power input can jointly supply power to the AC output interface 16.

[0052] In summary, the power supply circuit 10 can realize the functions of an online UPS or a backup UPS. In this way, the working mode of the power supply circuit 10 can be adjusted according to the actual requirements of the load, making the power supply circuit 10 flexible and suitable for different load requirements.

[0053] In some embodiments, the AC output interface 16 includes a first AC output interface 16a and a second AC output interface 16b, the AC input interface 12 is connected to the first AC output interface 16a to form a first branch 20, and the AC input interface 12, the first AC / DC conversion module 14a, the second AC / DC conversion module 14b, and the second AC output interface 16b are electrically connected in sequence to form a second branch 22.

[0054] In this way, the AC input interface 12 is connected to the first AC output interface 16a and is connected to the second AC output interface 16b through the first conversion module 14a and the second conversion module 14b, which can respectively realize the backup UPS and online UPS functions.

[0055] Specifically, the first AC / DC conversion module 14a is connected to the battery module 18, and the second AC / DC conversion module 14b is further connected to the battery module 18 and the second AC output interface 16b.

[0056] When the external AC power source is available, the AC power provided by the external AC power source can be directly supplied to the first AC output interface 16a via the first branch 20, such as Figure 3The first AC / DC conversion module 14 a is in rectification mode, converting AC power into DC power to charge the battery module 18 .

[0057] When the external AC power supply is unavailable, the power supply supplies power to the first AC output interface 16a, and the first AC / DC conversion module 14a switches from the rectification mode to the inverter mode to convert the DC power provided by the power supply into AC power. At this time, the conversion time is required, that is, the first AC output interface 16a is a backup UPS interface, such as Figure 6 shown.

[0058] Furthermore, in the above power supply process, when the second AC output interface 16b has a power demand, if the power supply of the external AC power source is greater than or equal to the sum of the output powers of the first AC output interface 16a and the second AC output interface 16b, the AC power of the external AC power source passes through the first AC / DC conversion module 14a, and part of it passes through the second AC / DC conversion module 14b to supply power to the second AC interface, and part of it is used to charge the battery module 18, as shown in FIG. Figure 4 shown.

[0059] If the power supplied by the external AC power source is less than the sum of the output powers of the first AC output interface 16a and the second AC output interface 16b, the battery module 18 can supply power to the second AC output interface 16b through the second AC / DC conversion module 14b. In this case, the AC power of the external AC power source supplies power to the first AC interface and charges the battery module 18 through the first AC / DC conversion module 14a. At the same time, the battery module 18 supplies power to the second AC output interface 16b through the second AC / DC conversion module 14b. Figure 5 shown.

[0060] Since the second AC / DC conversion module 14b is always in the inverter mode, if the external AC power source is unavailable, the battery module 18 can continue to supply power to the second AC output interface 16b, so that the second AC output interface 16b is an online UPS interface, such as Figure 6 shown.

[0061] Therefore, in a power supply circuit 10, the first AC output interface 16a can be a backup UPS interface, and the second AC output interface 16b can be an online UPS interface. The user can choose according to the actual needs of the load to connect the load to the first AC output interface 16a or the second AC output interface 16b.

[0062] In some embodiments, the first AC / DC conversion module 14a includes a first AC / DC sub-conversion module 28 and a first DC / DC conversion module 30 connected to the first AC / DC sub-conversion module 28, the second AC / DC conversion module 14b includes a second AC / DC sub-conversion module 32 and a second DC / DC conversion module 34 connected to the second AC / DC sub-conversion module 32, the first AC / DC sub-module 28 is connected to the AC input interface 12, the second AC / DC sub-conversion module 32 is connected to the second AC output interface 16b, and the first DC / DC module and the second DC / DC module are connected to each other and are both connected to the battery module.

[0063] In this way, the input and output of DC power can be made more stable.

[0064] Specifically, the first DC / DC conversion module 30 can output a stable DC voltage that is not affected by input voltage fluctuations and load changes. The first DC / DC conversion module 30 can adjust the output voltage to ensure normal and stable operation of the battery module 18.

[0065] The second DC / DC converter module 34 can output a stable DC voltage that is not affected by input voltage fluctuations and load changes. The second DC / DC converter module 34 can adjust the output voltage to ensure normal and stable operation of the battery module 18.

[0066] At the same time, when the second AC output interface 16b or the first and second AC output interfaces 16a and 16b are online UPSs, the second AC output interface 16b or the first and second AC output interfaces 16a and 16b are powered by the power supply through the second DC / DC conversion module 34 and the second AC / DC sub-conversion module 32. The external AC power supply charges the battery module 18 through the first AC / DC conversion module 14a.

[0067] In this way, when the external AC power source is distorted or interfered with, the power is transmitted to the battery module 18 through the first AC / DC conversion module 14a and absorbed by the battery module 18. The battery module 18 can then maintain a stable voltage output to power the second AC output interface 16b or the first and second AC output interfaces 16a, 16b. This ensures the quality of the power output from the second AC output interface 16b or the first and second AC output interfaces 16a, 16b.

[0068] In some embodiments, the power supply circuit 10 also includes a first switch 24, the AC input interface 12 is connected to the first AC / DC conversion module 14a and the second AC / DC conversion module 14b, and the first switch 24 is arranged between the first AC / DC sub-conversion module 28 and the second AC / DC sub-conversion module 32. The first switch 24 is used to control the connection or disconnection of the first AC / DC sub-conversion module 28 and the second AC / DC sub-conversion module 32. When the first switch 24 is connected, the AC input interface 12 inputs two-phase electricity, and power is supplied to the battery module 18 through the first AC / DC conversion module 14a and the second AC / DC conversion module 14b.

[0069] In this way, the power supply circuit 10 can realize a two-phase charging function for the battery module 18 .

[0070] Specifically, if Figure 7 As shown, the AC input interface 12 is connected to the first AC / DC conversion module 14a and the second AC / DC conversion module 14b via the live terminal L1 and the neutral terminal N, respectively. The first AC / DC conversion module 14a and the second AC / DC conversion module 14b are connected to the battery module 18 via the DC bus (positive DC bus BUS+, negative DC bus BUS-). The first switch 24 includes a first sub-switch and a second sub-switch. The first sub-switch is provided between the live terminal L1 of the first AC / DC conversion module 14a and the second AC / DC conversion module 14b, and the second sub-switch is provided between the neutral terminal N of the first AC / DC conversion module 14a and the second AC / DC conversion module 14b.

[0071] When the voltage between the live terminal L1 and the neutral terminal N of the AC input interface 12 is 120V (volts), the AC input interface 12 can realize two-phase input. Specifically, the transmission is carried out through two live wires and one neutral wire. The phase difference of the voltage between the two live wires is 180 degrees. One is connected to the first AC / DC module 14a, and the other is connected to the second AC / DC module 14b. When the first sub-switch and the second sub-switch are connected, the voltage between the live terminal L1 of the first AC / DC conversion module 14a and the second AC / DC conversion module 14b is 240V, supplying power to the battery module 18. That is, when the first switch 24 is closed, the power supply circuit 10 can realize a two-phase charging function for the battery module 18, and the input to the battery module 18 has a higher voltage and output current, which can provide a faster charging speed.

[0072] When the first switch 24 is disconnected, the power supply circuit 10 realizes the above-mentioned function of supplying power to the AC output interface 16 .

[0073] In some embodiments, the power supply circuit 10 also includes a second switch 26, which is arranged between the first AC output interface 16a and the second AC output interface 16b, and is used to turn the first AC output interface 16a and the second AC output interface 16b on or off. When the second switch 26 is turned on, the first AC output interface 16a and the second AC output interface 16b are simultaneously powered by the AC input interface 12.

[0074] In this way, the first AC output interface 16a and the second AC output interface 16b can be both online UPS interfaces or backup UPS interfaces.

[0075] Specifically, if Figure 8 As shown, in the first branch 20, the AC output interface 16 is connected to the first AC output interface 16a via the live terminal L1 and the neutral terminal N. In the second branch 22, the second AC / DC conversion module 14b is connected to the second AC output interface 16b via the live terminal L1 and the neutral terminal N. A second switch 26 is provided between the live terminal L1 of the first branch 20 and the live terminal L1 of the second branch 22. The first AC output interface 16a and the second AC output interface 16b can both be online UPS interfaces or backup UPS interfaces.

[0076] In some embodiments, when the second switch 26 is turned on, one of the first branch 20 and the second branch 22 is turned on, and the other is turned off.

[0077] In this way, the power supply modes of the first AC output interface 16 a and the second AC output interface 16 b can be controlled according to the on / off status of the first branch 20 and the second branch 22 .

[0078] Specifically, if Figure 9 As shown, when the second switch 26 is turned on, the AC power input from the external AC power supply is supplied to the first AC output interface 16a via the first branch 20, and can also be supplied to the second AC output interface 16b via the turned-on second switch 26. Simultaneously, the external AC power supply supplies power to the battery module 18 via the first AC / DC conversion module 14a. According to the above analysis, after the external AC power supply becomes unavailable, the first AC / DC conversion module 14a switches from a rectifier module to an inverter mode, with a switching time interval. After the first AC / DC conversion module 14a switches to the inverter mode, it supplies power to both the first AC output interface 16a and the second AC output interface 16b. In this way, the first AC output interface 16a and the second AC output interface 16b can simultaneously function as backup UPS interfaces.

[0079] like Figure 10As shown, when the second switch 26 is turned on, the battery module 18 supplies power to the second AC output interface 16b via the second AC / DC conversion module 14b, while simultaneously supplying power to the first AC output interface 16a via the turned-on second switch 26. Simultaneously, the external AC power source can also supply power to the battery module 18 via the first AC / DC conversion module 14a. Thus, based on the analysis above, even if the external AC power source becomes unavailable, the battery module 18 can continue to supply power to the first and second AC output interfaces 16a, 16b, without being affected by the external AC power source. This allows the first and second AC output interfaces 16a, 16b to function as online UPS interfaces simultaneously.

[0080] like Figure 11 As shown, when the second switch 26 is disconnected, the first AC output interface 16a can be used as a backup UPS interface and the second AC output interface 16b can be used as an online UPS interface according to the above analysis.

[0081] In some embodiments, the power supply circuit 10 also includes a third AC output interface, the AC input interface 12 includes: a first live wire terminal and a second live wire terminal, the third AC output interface includes a third live wire terminal and a fourth live wire terminal, and when the battery module 18 supplies power to the third AC output interface, the third live wire terminal is connected to the first AC / DC module 14a, and the fourth live wire terminal is connected to the second AC / DC module 14b; when the AC input interface 12 supplies power to the third AC output interface, the first live wire terminal is connected to the third live wire terminal, and the second live wire terminal is connected to the fourth live terminal.

[0082] In this way, by simultaneously outputting AC power through the third live terminal and the fourth live terminal of the third AC output interface, a voltage output of 240V can be achieved, which can meet a greater load power requirement.

[0083] Specifically, the AC input interface 12 can output split-phase power. For example, a 120V voltage can be output between the first live terminal and the neutral terminal of the AC input interface 12, and a 240V voltage can be output between the first live terminal and the second live terminal.

[0084] When the battery module 18 supplies power to the third AC output interface, the third live terminal is connected to the first AC / DC module 14a, and the fourth live terminal is connected to the second AC / DC module 14b. The first AC / DC module 14a and the second AC / DC module 14b convert the DC power provided by the battery into AC power, and a 240V voltage can be output between the third live terminal and the fourth live terminal of the third AC output interface.

[0085] When the AC input interface 12 supplies power to the third AC output interface, the first live terminal is connected to the third live terminal, and the second live terminal is connected to the fourth live terminal. The AC input interface 12 can directly power the third AC output interface, allowing a 240V voltage to be output between the third and fourth live terminals of the third AC output interface. This can meet greater load power requirements and provide the power supply circuit 10 with a wider range of usage scenarios.

[0086] In some embodiments, the second branch 22 is used to charge the battery module 18 using the second branch 22 when an external AC power source is available.

[0087] In this manner, the battery module 18 may be charged when external AC power is available.

[0088] Specifically, the battery module 18 can supply power to the AC output interface 16. For example, when an external AC power source is unavailable or during peak electricity rates, the battery module 18 can be selected to supply power to the AC output interface 16.

[0089] In order to ensure that the battery module 18 maintains sufficient power for use when needed, when an external AC power supply is available, the second branch 22 is used to charge the battery module 18 through the first AC / DC conversion module 14a. Specifically, the AC power provided by the external AC power supply is converted into DC power through the first AC / DC conversion module 14a to charge the battery module 18.

[0090] See also Figure 1 In some embodiments, the first AC / DC conversion module 14a includes a first AC-DC conversion module 28 , which is connected to the first AC input interface 12 and the battery module 18 , respectively.

[0091] In this way, the first AC-DC conversion module 28 can perform AC-DC conversion between the external AC power source and the battery module 18 .

[0092] Specifically, the first AC-DC conversion module 28 has a rectification mode and an inversion mode. In the rectification mode, the first AC-DC conversion module 28 can be used to convert the AC power provided by the external AC power supply into DC power to charge the battery module 18; in the inversion mode, the first AC-DC conversion module 28 can be used to convert the DC power provided by the battery module 18 into AC power to supply power to the AC output interface 16.

[0093] See also Figure 1 In some embodiments, the second AC / DC conversion module 14 b includes a second AC / DC sub-conversion module 32 , and the second AC / DC sub-conversion module 32 is connected to the second AC input interface 12 and the battery module 18 , respectively.

[0094] In this way, the second AC / DC sub-conversion module 32 can perform AC-DC conversion between the external AC power source and the battery module 18 .

[0095] Specifically, the second AC / DC sub-conversion module 32 has a rectification mode and an inversion mode. In the rectification mode, the second AC / DC sub-conversion module 32 can be used to convert the AC power provided by the external AC power supply into DC power to charge the battery module 18; in the inversion mode, the second AC / DC sub-conversion module 32 can be used to convert the DC power provided by the battery module 18 into AC power to supply power to the AC output interface 16.

[0096] In some embodiments, the power supply circuit 10 includes a control module 36 , which is configured to control the operating states of the conversion module 14 and the battery module 18 according to user instructions.

[0097] In this way, the control module 36 can control the working states of the conversion module 14 and the battery module 18 according to the user's needs, so that the AC output interface 16 can be in the working state required by the user.

[0098] Specifically, the first AC output interface 16a and the second AC output interface 16b provide power to connected loads. The user can select the power supply type of the first AC output interface 16a and the second AC output interface 16b according to the type of the load.

[0099] In one embodiment, the power supply circuit 10 is arranged in the energy storage device 100, and the energy storage device 100 has a charging interface and a power supply interface. The charging interface is connected to the AC output interface 16, and the power supply interface may include a first power supply interface and a second power supply interface. The first power supply interface is connected to the first AC output interface 16a, and the second power supply interface is connected to the second AC output interface 16b. In this way, the energy storage device 100 can realize the functions of the different types of UPS described above.

[0100] That is, the first power supply interface is a backup UPS interface, and the second power supply interface is an online UPS interface; or, the first power supply interface and the second power supply interface are both backup UPS interfaces; or, the first power supply interface and the second power supply interface are both online UPS interfaces.

[0101] The energy storage device 100 has a control panel that can interact with the user. The control panel is connected to the control module 36, and the user can make selections as needed. In response to user instructions, the control module 36 controls the conversion module 14 and the battery module 18 to be in corresponding working states.

[0102] In some embodiments, the conversion module further includes a switch module, which includes an input switch module and an output switch module. The input switch module is provided at the AC input interface 12, and includes an input switch K1 and an input switch K2. Figure 1 and Figure 2 As shown, the live terminal L1 of the AC input interface 12 is connected to the input switch K1, and the neutral terminal N of the AC input interface 12 is connected to the input switch K2. The output switch module is provided at the AC output interface 12, and the input switch module includes an output switch K3, an output switch K4, and an output switch K5. Figure 1 and Figure 2 As shown, the live terminal L1 of the first AC output interface 16a is connected to the output switch K3, the live terminal L1 of the second AC output interface 16b is connected to the output switch K5, and the neutral terminal N of the first AC output interface 16a and the second AC output interface 16b are connected to each other and to the output switch K4.

[0103] In this way, the control module 36 can control the on and off of the switch module, thereby controlling the on and off states of the power supply circuit 10 and the external AC power supply and the load.

[0104] An energy storage device 100 according to an embodiment of the present invention includes the power supply circuit 10 according to any one of the above embodiments.

[0105] The energy storage device 100, when an external AC power source is available, can enable the external AC power source to output power to the AC output interface 16 or charge the battery module 18. Moreover, regardless of whether the external AC power source is available or unavailable, the battery module 18 can be used to output power to the AC output interface 16. In this way, the power supply circuit 10 can simultaneously realize the functions of an online UPS and a backup UPS, thereby making the power supply circuit 10 flexible and suitable for different load requirements.

[0106] Specifically, by setting up the power supply circuit 10, the energy storage device 100 can obtain electrical energy from the outside, such as from a power grid, a generator, an energy storage device connected to a power supply device, etc., and output AC power to the outside; the energy storage device 100 can also store the obtained electrical energy in a rechargeable battery in the energy storage device 100.

[0107] It should be noted that the above explanations of the implementation and beneficial effects of the power supply circuit 10 are also applicable to the energy storage device 100 of the embodiment of the present utility model. To avoid redundancy, they are not elaborated here.

[0108] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0109] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above implementation methods within the scope of the present invention.

Claims

1. A power supply circuit, characterized in that: It includes an AC input interface, a first AC / DC conversion module, a second AC / DC conversion module, and an AC output interface, wherein the AC input interface is used to connect to an external AC power source, the first AC / DC conversion module and the second AC / DC conversion module are used to connect to a battery module, the AC input interface and the AC output interface are electrically connected to form a first branch, and the AC input interface, the first AC / DC conversion module, the second AC / DC conversion module, and the AC output interface are electrically connected in sequence to form a second branch; The first branch is used to output electric energy through the AC output interface using the external AC power supply when the external AC power supply is available; The second branch is used for, when the external AC power source is available, the external AC power source to output electric energy to the AC output interface through the second branch, and / or; The second branch is used to output electric energy to the AC output interface by using the battery module through the second AC / DC conversion module when the external AC power source is available or unavailable.

2. The power supply circuit according to claim 1, wherein: The AC output interface includes a first AC output interface and a second AC output interface, the AC input interface is connected to the first AC output interface to form the first branch, and the AC input interface, the first AC / DC conversion module, the second AC / DC conversion module and the second AC output interface are electrically connected in sequence to form the second branch.

3. The power supply circuit according to claim 2, wherein: The first AC / DC conversion module includes a first AC / DC sub-conversion module and a first DC / DC conversion module connected to the first AC / DC sub-conversion module. The second AC / DC conversion module includes a second AC / DC sub-conversion module and a second DC / DC conversion module connected to the second AC / DC sub-conversion module. The first AC / DC sub-module is connected to the AC input interface, the second AC / DC sub-conversion module is connected to the second AC output interface, and the first DC / DC module and the second DC / DC module are connected to each other and are both connected to the battery module.

4. The power supply circuit according to claim 3, characterized in that: The power supply circuit also includes a first switch. The AC input interface is connected to the first AC / DC conversion module and the second AC / DC conversion module. The first switch is arranged between the first AC / DC sub-conversion module and the second AC / DC sub-conversion module. The first switch is used to control the connection or disconnection of the first AC / DC sub-conversion module and the second AC / DC sub-conversion module. When the first switch is connected, the AC input interface inputs two-phase electricity, and power is supplied to the battery module through the first AC / DC conversion module and the second AC / DC conversion module.

5. The power supply circuit according to claim 2, characterized in that: The power supply circuit also includes a second switch, which is arranged between the first AC output interface and the second AC output interface, and is used to connect or disconnect the first AC output interface and the second AC output interface. When the second switch is turned on, the first AC output interface and the second AC output interface are simultaneously powered by the AC input interface.

6. The power supply circuit according to claim 5, characterized in that: When the second switch is turned on, one of the first branch and the second branch is turned on, and the other is turned off.

7. The power supply circuit according to claim 2, wherein: The power supply circuit also includes a third AC output interface, the AC input interface includes: a first live terminal and a second live terminal, the third AC output interface includes a third live terminal and a fourth live terminal, when the battery module supplies power to the third AC output interface, the third live terminal is connected to the first AC / DC module, and the fourth live terminal is connected to the second AC / DC module; when the AC input interface supplies power to the third AC output interface, the first live terminal is connected to the third live terminal, and the second live terminal is connected to the fourth live terminal.

8. The power supply circuit according to claim 1, wherein: The second branch is used to charge the battery module using the second branch when the external AC power source is available.

9. The power supply circuit according to claim 1, characterized in that: The power supply circuit includes a control module, which is used to control the working states of the first AC / DC conversion module, the second AC / DC conversion module and the battery module according to user instructions.

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

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