A power supply circuit, energy storage system

Abstract

The application provides a power supply circuit and an energy storage system. The power supply circuit comprises an electric energy storage module, an electric energy conversion module, a detection module, a high-voltage auxiliary power supply module, a low-voltage auxiliary power supply module and an auxiliary power supply module. The output ends of the high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module are connected with the auxiliary power supply module, and are used for providing a power supply voltage to the auxiliary power supply module. The charging and discharging states of the electric energy storage module and the output voltage of the electric energy conversion module are detected by the detection module, and the voltage type output to the auxiliary power supply module is determined based on the detection result. In this way, the negative influence of insufficient energy provided by the electric energy conversion module on the normal work of the weak current circuit can be reduced, the power loss of the electric energy storage module can be reduced to the maximum extent, and the energy utilization rate of the electric energy conversion module can be maximized.

Description

Technical Field

[0001] This application relates to the field of power generation or distribution technology, specifically to a power supply circuit and an energy storage system. Background Technology

[0002] In a power generation system (or power distribution system), the entire system typically includes high-voltage circuits and low-voltage circuits. High-voltage circuits provide energy, enabling the conversion and utilization of electrical energy, while low-voltage circuits are used for signal control. Common power supply solutions for low-voltage circuits include: directly supplying power after transforming the voltage output from the high-voltage circuits, or using electrical energy stored in an energy storage module.

[0003] When the voltage output from the high-voltage circuit is used to directly power the low-voltage circuit, if the energy provided by the high-voltage circuit is insufficient to support the normal operation of the low-voltage circuit, it will directly affect the normal operation of the low-voltage circuit. Alternatively, when the electrical energy stored in the energy storage module is used to power the low-voltage circuit, it will increase the power consumption of the energy storage module, affecting the amount of electricity the user can use from the energy storage module. Utility Model Content

[0004] In view of this, this application provides a power supply circuit and an energy storage system to reduce the power loss of the energy storage module while improving the power utilization rate of the high-voltage circuit.

[0005] In one aspect, this application provides a power supply circuit, which includes: an energy storage module, an energy conversion module, a detection module, a high-voltage auxiliary power supply module, a low-voltage auxiliary power supply module, and an auxiliary power supply module; the output terminals of the high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module are respectively connected to the auxiliary power supply module to provide power supply voltage to the auxiliary power supply module;

[0006] The input terminal of the detection module is connected to the output terminals of the energy storage module and the energy conversion module, respectively, and is used to detect the charging and discharging status of the energy storage module and the output voltage of the energy conversion module.

[0007] The input terminal of the high-voltage auxiliary power source module is connected to the output terminal of the detection module, and is used to determine whether to output a high-voltage voltage signal based on the output voltage according to the charging and discharging state.

[0008] The input terminal of the low-voltage auxiliary power supply module is connected to the output terminal of the energy storage module and the output terminal of the high-voltage auxiliary power supply module, respectively, for selectively receiving the high-voltage voltage signal and / or the low-voltage voltage signal to output a target voltage signal to the auxiliary power supply module; wherein, the low-voltage voltage signal is the voltage signal output by the energy storage module.

[0009] Secondly, this application provides an energy storage system, wherein the energy storage system includes the power supply circuit described in the first aspect, and the power conversion module in the power supply circuit is a photovoltaic module.

[0010] The beneficial effects of this application are:

[0011] This application provides a power supply circuit and an energy storage system. The power supply circuit includes an energy storage module, an energy conversion module, a detection module, a high-voltage auxiliary power supply module, a low-voltage auxiliary power supply module, and an auxiliary power supply module. The output terminals of the high-voltage and low-voltage auxiliary power supply modules are respectively connected to the auxiliary power supply module, and the high-voltage and low-voltage auxiliary power supply modules provide power supply voltage to the auxiliary power supply module. The input terminal of the detection module is connected to the output terminals of the energy storage module and the energy conversion module to detect the charging and discharging state of the energy storage module and the output voltage of the energy conversion module. Based on the detection results, it is determined whether the voltage output to the auxiliary power supply module is a high-voltage signal, a low-voltage signal, or both simultaneously. This not only reduces the negative impact on the normal operation of weak current circuits caused by insufficient energy provided by the energy conversion module, but also minimizes the power loss of the energy storage module and maximizes the energy utilization rate of the energy conversion module.

[0012] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This paper shows a schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0015] Figure 2 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0016] Figure 3 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0017] Figure 4 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0018] Figure 5 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0019] Figure 6 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0020] Figure 7 This illustration shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application;

[0021] Figure 8 This paper shows another structural schematic diagram of the power supply circuit provided in an embodiment of this application. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0025] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0027] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0028] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0029] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0030] In this application, "high voltage" and "low voltage" are relative concepts, derived from comparisons based on a pre-set voltage threshold. The specific threshold can be flexibly set according to actual needs. Similarly, in this application, "high voltage" and "low voltage" are also relative concepts, derived from comparisons based on a pre-set voltage threshold. The specific threshold can also be flexibly set according to actual needs.

[0031] As described in the background art, power generation systems or power distribution systems typically include high-voltage circuits and low-voltage circuits. The high-voltage circuits are used to realize the basic high-voltage functions of the entire system, such as power generation and voltage transformation, and usually include high-voltage hardware devices with large operating voltage and power, such as transformers and power converters.

[0032] Low-voltage circuits are used for signal control, mainly controlling the normal operation of the entire system. For example, control circuits ensure that the power generation system can generate electricity and transform voltage according to the set program logic. They typically include low-voltage hardware components such as resistors, inductors, capacitors, processing chips, and semiconductor devices.

[0033] Taking a photovoltaic (PV) power generation system as an example, the high-voltage circuit of a PV power generation system includes hardware components such as PV panels, inverters, and batteries, used to realize the conversion and storage of electrical energy generated by PV. The operating voltage is relatively high, such as 220V or 380V. The low-voltage circuit of a PV power generation system includes a hardware circuit board, which may contain electronic components used to implement the corresponding control logic, such as processing chips, resistors, capacitors, inductors, etc. The operating voltage of this hardware circuit board is relatively low, such as 5V or 3.3V.

[0034] Low-voltage circuits require a power supply to function properly, but traditional low-voltage circuit power supply schemes tend to increase power loss to the energy storage module. Therefore, to reduce power loss from low-voltage circuits to the energy storage module and improve the power utilization rate of high-voltage circuits, this application provides a power supply circuit and an energy storage system.

[0035] The power supply circuit provided in this application can be applied to any type of power generation system or power distribution system. In addition to the photovoltaic power generation system mentioned above, it can also be applied to different types of power generation systems (or power distribution systems) such as hydropower power generation systems, oil-fired power generation systems, nuclear power generation systems, etc.

[0036] In some possible embodiments, the power supply circuit provided in this application may be as follows: Figure 1 As shown, it includes: an energy storage module, an energy conversion module, a detection module, a high-voltage auxiliary power supply module, a low-voltage auxiliary power supply module, and an auxiliary power supply module; the output terminals of the high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module are respectively connected to the auxiliary power supply module. The high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module are used to provide power supply voltage to the auxiliary power supply module. The auxiliary power supply module can be connected to a low-voltage circuit to supply power to that circuit.

[0037] Among them, the power conversion module is any device that can convert other types of energy into electrical energy, which can be simply referred to as power generation equipment, such as fuel generators, photovoltaic equipment, wind turbines, etc.

[0038] An energy storage module is any device capable of locally storing electrical energy converted by an energy conversion module. The energy conversion module transmits the converted electrical energy to the energy storage module for local storage. As one implementation, this energy storage module is an energy storage battery. Specifically, the energy storage module can be a battery pack, which is a battery system composed of multiple individual battery cells capable of providing voltage and capacity.

[0039] In this application, the input terminal of the detection module is connected to the output terminals of the energy storage module and the energy conversion module, respectively, and is used to detect the charging status of the energy storage module and the output voltage of the energy conversion module.

[0040] The input terminal of the high-voltage auxiliary power supply module is connected to the output terminal of the detection module, and is used to determine whether to output a high-voltage voltage signal based on the charging and discharging state.

[0041] The input terminal of the low-voltage auxiliary power supply module is connected to the output terminal of the energy storage module and the output terminal of the high-voltage auxiliary power supply module, respectively, to select the input of high-voltage voltage signal and / or low-voltage voltage signal in order to output the target voltage signal to the auxiliary power supply module; wherein, the low-voltage voltage signal is the voltage signal output by the energy storage module.

[0042] In some possible embodiments, it may be as follows Figure 2 As shown, the power supply circuit provided in this application further includes: a transformer module, through which the power conversion module outputs power to the power storage module. Specifically, the power conversion module and the power storage module transmit power through coupling between the primary and secondary coils of the transformer module. The detection module includes: a first detection circuit and a second detection circuit. Wherein:

[0043] The first detection circuit is connected in series with the primary coil in the transformer module, or with the negative output line of the energy storage module (e.g., Figure 3 The BAT-) shown in the figure are connected in series. The first detection circuit is used to detect the charging and discharging state of the energy storage module and generate a first indication signal for indicating the charging and discharging state of the energy storage module.

[0044] The second detection circuit has a first end connected to the positive output terminal of the power conversion module and a second end connected to the negative output terminal of the power conversion module. It is used to detect the output voltage of the power conversion module and generate a second indication signal to indicate whether the output voltage is greater than a preset voltage threshold.

[0045] The energy storage module's charging and discharging states are divided into two categories: discharge state and non-discharge state. The non-discharge state includes charging state and standby state. The first detection circuit is connected in series with the primary coil of the energy storage module or in series with the negative output line of the energy storage module. It can determine whether the energy conversion module is charging the energy storage module or whether the energy storage module is discharging based on the current in the circuit.

[0046] The first indication signal is used to indicate whether the energy storage module is in a discharging state or a non-discharging state.

[0047] The first terminal of the second detection circuit is connected to the positive output terminal of the power conversion module (e.g., Figure 3 The + sign indicates that the second terminal is connected to the negative output terminal of the power conversion module (as shown in the diagram). Figure 3As shown in the diagram, by detecting the output voltage of the power conversion module and comparing it with the preset voltage threshold, the current power output status of the power conversion module can be determined. In this application, the preset voltage threshold can be flexibly set according to the actual circuit requirements, and this application does not impose strict limitations on it.

[0048] In this way, the power supply for the auxiliary power supply module can be adaptively determined based on the actual charging and discharging state of the energy storage module and its power output. This not only reduces the negative impact on the normal operation of weak current circuits caused by insufficient energy provided by the energy conversion module, but also minimizes the power loss of the energy storage module and maximizes its energy utilization rate.

[0049] As described above, the states of an energy storage module can be divided into two categories: discharge state and non-discharge state. The non-discharge state can include both charging state and standby state. The discharge state refers to the release of the electrical energy stored within the energy storage module to the outside through the output cable or output port; the charging state refers to the storage of the electrical energy input from the energy conversion module into the local battery structure; and the standby state refers to the state where no energy storage or release has occurred.

[0050] As one implementation, the first detection circuit includes:

[0051] The current sampling unit is connected in series with the primary coil of the transformer module to form a first current sampling circuit (as shown in the image). Figure 4 (as shown), or connected in series with the negative output line of the energy storage module to form a second current sampling circuit (as shown). Figure 5 (As shown).

[0052] The current sampling unit is used to determine the charging and discharging state of the energy storage module based on the current direction in the first current sampling circuit, or based on the current direction in the second current sampling circuit.

[0053] Because the current flow direction in the primary coil of the energy conversion module differs from that in the secondary coil of the energy storage module during charging and discharging—specifically, in the discharging state, the current flow in both coils is counterclockwise, while in the charging or standby state, the current flow is clockwise—if the current in the first current sampling circuit is counterclockwise (e.g., ... Figure 4 The flow from HV- to HV+ indicates that the energy storage module is currently discharging. If the current is clockwise within the first current sampling circuit (as shown), it means that the energy storage module is currently discharging. Figure 4If the flow from HV+ to HV- is shown, it means that the energy storage module is currently in a non-discharge state. Based on this, the current sampling unit can determine the charging and discharging state of the energy storage module by detecting the current direction and magnitude in the first current sampling circuit.

[0054] To accurately determine whether the energy storage module is in a discharging or non-discharging state, one implementation method is as follows: Figure 4 As shown, the current sampling unit includes a resistor R, a differential operational amplifier unit OP, and a first comparison unit CMP1. The resistor is connected in series with the primary coil of the power conversion module. The first terminal of the differential operational amplifier unit OP is connected to the first terminal of the resistor, and the second terminal is connected to the second terminal of the resistor. The output terminal outputs the first detection voltage V1 to the first comparison unit CMP1. Then, the first comparison unit compares the first detection voltage V1 with the first reference voltage Verf1 and outputs a first indication signal based on the comparison result.

[0055] In this embodiment, if the input analog voltage is greater than or equal to the first reference voltage, it means that the power conversion module is outputting power to the power storage module through the primary coil. At this time, the power storage module is in a non-discharge state (including charging state and standby state), and the power conversion module is in a working state. The power conversion module can be used to supply power to the auxiliary power supply module, or the power conversion module can be used in conjunction with the power storage module to supply power to the auxiliary power supply module. At this time, a high level (logic "1") can be output, and this high level is used as the first indication signal to indicate that the current power storage module is in a non-discharge state.

[0056] Because the voltage level of the power conversion module is higher than that of the energy storage module, the power supply circuit provided in this application needs to select the power supply for the auxiliary power supply module. Among the selected power supplies is a high-voltage source. Therefore, the first detection circuit can be connected to the power conversion module side, which can ensure that the voltage processed by the control circuit is controlled to be on the same order of magnitude. If the first detection circuit is located on the energy storage device side, the voltages on both sides are not on the same order of magnitude, and the output of the first detection circuit needs to be amplified before being input into the high-voltage auxiliary power supply module.

[0057] Based on this, in some possible embodiments, the high-voltage auxiliary power supply module is used for:

[0058] If the first indication signal indicates that the energy storage module is in a discharging state, it is determined that the high voltage signal will not be output.

[0059] Specifically, the first detection circuit can be as follows: Figure 6As shown, it includes: a first switching unit S1, the first terminal of which is connected to the power supply voltage source Vcc, and the second terminal of which is connected to the power supply terminal (Vcc) of the high-voltage auxiliary power supply module. The first switching unit S1 is used to disconnect when the energy storage module is in a discharging state according to a first indication signal, thereby disconnecting the power supply to the high-voltage auxiliary power supply module, causing the high-voltage auxiliary power supply module to stop working and unable to output voltage to the auxiliary power supply module. The first switching unit S1 is also used to close when the energy storage module is in a non-discharging state according to the first indication signal, thereby supplying power to the high-voltage auxiliary power supply module, causing the high-voltage auxiliary power supply module to work and output voltage to the auxiliary power supply module.

[0060] In this application, different output voltages of the power conversion modules indicate different energy conversion capabilities. For example, taking a photovoltaic (PV) panel as the power conversion module, the output voltage of the PV panel is greater than or equal to a preset voltage threshold in environments with strong sunlight, and less than the preset voltage threshold in environments with weak sunlight.

[0061] In this application, the second detection circuit may include a voltage acquisition unit, the two ends of which are respectively connected to the output terminals of the power conversion module, for detecting the output voltage of the power conversion module and generating a second detection voltage. The second detection circuit may further include a second comparison unit, the first input terminal of which is connected to the voltage acquisition unit to receive the second detection voltage, and the second input terminal receiving a second reference voltage. The second comparison unit is used to compare the second detection voltage with the second reference voltage and output a second indication signal based on the comparison result.

[0062] The second comparison unit can be a non-inverting comparator. By setting a second reference voltage (denoted as Verf2) for the non-inverting comparator, and then converting the output voltage of the voltage acquisition unit into a second detection voltage (denoted as V2) of the same order of magnitude as the non-inverting comparator, the second detection voltage is used as an input of the non-inverting comparator. Then, V2 is compared with Verf2. If V2 < Verf2, it means that the output voltage of the power conversion module is weak. At this time, a low level (logic "0") can be output, and the low level is output as a second indication signal to the high-voltage auxiliary power supply module.

[0063] If V2≥Verf2, it means that the power conversion module has a strong output voltage and can convert other energy into electrical energy. At this time, a high level ("logo 1") can be output as a second indication signal to the high voltage auxiliary power module.

[0064] In some possible embodiments, it may be as follows Figure 7 As shown, the second detection circuit includes:

[0065] The second switching unit S2 has its first terminal connected to the feedback terminal (FB) of the high-voltage auxiliary power supply module, and its second terminal grounded. This second switching unit is used to close when the output voltage of the power conversion module is greater than or equal to a preset voltage threshold, or to open when the output voltage is less than the preset voltage threshold, based on a second indication signal.

[0066] In some possible embodiments, the high-voltage auxiliary power source module is used to output a first high-voltage signal based on the output voltage when the first indication signal indicates that the energy storage module is in a non-discharge state and the second indication signal indicates that the output voltage is greater than or equal to the preset voltage threshold.

[0067] When the first indication signal indicates that the energy storage module is in a non-discharge state, and the second indication signal indicates that the output voltage is less than the preset voltage threshold, a second high-voltage signal is output based on the output voltage.

[0068] The first high-voltage signal is greater than the second voltage signal.

[0069] Specifically, as described above, the first terminal of the second switching unit S2 is connected to the feedback terminal (FB) of the high-voltage auxiliary power supply module, and the second terminal of the second switching unit S2 is grounded, specifically connected to the FB pin of the control chip within the high-voltage auxiliary power supply module. If S2 is closed, the voltage of S2 can pull the level of the FB pin of the control chip low, increasing the output of the error comparator inside the control chip. This will increase the duty cycle of the control chip's output signal (which can be a pulse-modulated PWM signal). The voltage output by the control chip is a high-voltage signal, causing the output voltage of the power conversion module to compete with the output voltage of the energy storage module. The output voltage of the power conversion module is higher than that of the energy storage module, and the output voltage of the power conversion module supplies power to the auxiliary power supply module.

[0070] If S2 is disconnected, the voltage output by S2 cannot pull the level of the FB pin of the control chip low, the voltage of the FB pin rises, the error comparator cannot function, at this time the duty cycle of the drive control signal output by the control chip will decrease accordingly, the output voltage of the high voltage auxiliary power supply module will decrease accordingly, so that the output voltage of the power conversion module and the output voltage of the power storage module jointly power the auxiliary power supply module.

[0071] As described above, if both S1 and S2 are closed, the output voltage of the power conversion module and the output voltage of the power storage module will compete. The power supply circuit provided in this application can be as follows: Figure 8 As shown, it includes: a first unidirectional conduction module D1 and a second unidirectional conduction module D2.

[0072] The positive terminal of the first unidirectional conduction module D1 is connected to the high-voltage auxiliary power supply module, and the negative terminal of the first unidirectional conduction module D1 is connected to the low-voltage auxiliary power supply module.

[0073] The second unidirectional conduction module D2 has its positive terminal connected to the energy storage module and its negative terminal connected to the low-voltage auxiliary power supply module.

[0074] By using the power supply circuit provided in this application, the voltage competition between the high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module can be realized through the first unidirectional conduction module D1 and the second unidirectional conduction module D2 without causing interference to each other's internal circuits.

[0075] Specifically, in some possible embodiments, it may be as follows: Figure 8 As shown, the output terminal of the high-voltage auxiliary power supply module is connected to the input terminal of the low-voltage auxiliary power supply module. The low-voltage auxiliary power supply module is used to output the target voltage signal to the auxiliary power supply module based on the first high-voltage voltage signal output by the high-voltage auxiliary power supply module. Specifically, the first high-voltage voltage signal can be determined as the target voltage signal and output to the auxiliary power supply module.

[0076] When the high-voltage auxiliary power supply module outputs the second high-voltage signal, the target voltage signal is output to the auxiliary power supply module based on the second high-voltage signal and the low-voltage signal. At this time, the high-voltage signal and the low-voltage signal can be compared, and the larger voltage signal can be determined as the target voltage signal and output to the auxiliary power supply module. Alternatively, the high-voltage signal and the low-voltage signal can be added together, and the voltage signal corresponding to the sum can be determined as the target voltage signal and output to the auxiliary power supply module.

[0077] When the high-voltage auxiliary power supply module does not output the high-voltage voltage signal, the target voltage signal is output to the auxiliary power supply module based on the low-voltage voltage signal.

[0078] In some possible embodiments, the low-voltage auxiliary power supply module further includes a voltage conversion circuit (DC / DC conversion circuit) connected to the output terminal of the low-voltage auxiliary power supply module, used to convert the input voltage signal into a power supply signal required by the auxiliary power supply module, that is, to convert the input high voltage signal and / or low voltage signal into a power supply signal required by the auxiliary power supply module, which is the target voltage signal.

[0079] Since the voltage output by the power conversion module and / or energy storage module may not be on the same order of magnitude as the supply voltage of the auxiliary power supply module, this voltage conversion circuit is used to transform the voltage signal output by the power conversion module and / or energy storage module in order to maintain the stability of the input voltage of the auxiliary power supply module.

[0080] Based on the power supply circuit provided in the first aspect, in a second aspect, this application also provides an energy storage system, which includes the power supply circuit described in the first aspect. The power conversion module in the energy storage system can be photovoltaic.

[0081] By selecting the energy storage system provided in this application, the power supply from the energy storage module and / or the energy conversion module to the auxiliary power supply module can be dynamically controlled according to the specific charging and discharging state of the energy storage module and the output voltage of the energy conversion module. This can minimize the energy loss of the auxiliary power supply module to the energy storage module, maximize the utilization of the energy converted by the energy conversion module, stabilize the voltage on the energy conversion module side, reduce the impact of the power supply from the energy storage module on the voltage on the energy conversion module side, and help ensure the normal operation of the low-voltage circuit.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: an energy storage module, an energy conversion module, a detection module, a high-voltage auxiliary power supply module, a low-voltage auxiliary power supply module, and an auxiliary power supply module; the output terminals of the high-voltage auxiliary power supply module and the low-voltage auxiliary power supply module are respectively connected to the auxiliary power supply module to provide power supply voltage to the auxiliary power supply module; The input terminal of the detection module is connected to the output terminals of the energy storage module and the energy conversion module, respectively, and is used to detect the charging and discharging status of the energy storage module and the output voltage of the energy conversion module. The input terminal of the high-voltage auxiliary power source module is connected to the output terminal of the detection module, and is used to determine whether to output a high-voltage voltage signal based on the output voltage according to the charging and discharging state. The input terminal of the low-voltage auxiliary power supply module is connected to the output terminal of the energy storage module and the output terminal of the high-voltage auxiliary power supply module, respectively, for selectively receiving the high-voltage voltage signal and / or the low-voltage voltage signal to output a target voltage signal to the auxiliary power supply module; wherein, the low-voltage voltage signal is the voltage signal output by the energy storage module.

2. The power supply circuit according to claim 1, characterized in that, The power supply circuit further includes a transformer module, and the power conversion module outputs power to the power storage module through the transformer module. The detection module includes: The first detection circuit is connected in series with the primary coil in the transformer module or in series with the negative output line of the energy storage module. The first detection circuit is used to detect the charging and discharging state of the energy storage module and generate a first indication signal to indicate the charging and discharging state of the energy storage module. The second detection circuit has a first end connected to the positive output terminal of the power conversion module and a second end connected to the negative output terminal of the power conversion module. It is used to detect the output voltage of the power conversion module and generate a second indication signal to indicate whether the output voltage is greater than a preset voltage threshold.

3. The power supply circuit according to claim 2, characterized in that, The high-voltage auxiliary power supply module is used for If the first indication signal indicates that the energy storage module is in a discharging state, it is determined that the high voltage signal will not be output.

4. The power supply circuit according to claim 2, characterized in that, The high-voltage auxiliary power module is used to output a first high-voltage signal based on the output voltage when the first indication signal indicates that the energy storage module is in a non-discharge state and the second indication signal indicates that the output voltage is greater than or equal to the preset voltage threshold. When the first indication signal indicates that the energy storage module is in a non-discharge state, and the second indication signal indicates that the output voltage is less than the preset voltage threshold, a second high-voltage signal is output based on the output voltage. The first high-voltage signal is greater than the second high-voltage signal.

5. The power supply circuit according to claim 4, characterized in that, The low-voltage auxiliary power supply module is used to output the target voltage signal to the auxiliary power supply module based on the first high-voltage voltage signal when the high-voltage auxiliary power supply module outputs the first high-voltage voltage signal. When the high-voltage auxiliary power module outputs the second high-voltage voltage signal, the target voltage signal is output to the auxiliary power supply module based on the second high-voltage voltage signal and the low-voltage voltage signal. When the high-voltage auxiliary power supply module does not output the high-voltage voltage signal, the target voltage signal is output to the auxiliary power supply module based on the low-voltage voltage signal.

6. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes: A first unidirectional conduction module, the positive terminal of which is connected to the high-voltage auxiliary power supply module, and the negative terminal of which is connected to the low-voltage auxiliary power supply module. The second unidirectional conduction module has its positive terminal connected to the energy storage module and its negative terminal connected to the low-voltage auxiliary power supply module.

7. The power supply circuit according to claim 2, characterized in that, The first detection circuit includes: The first switching unit has a first terminal connected to a power supply voltage source and a second terminal connected to the power supply terminal of the high-voltage auxiliary power module. The first switching unit is used to disconnect when the energy storage module is in a discharging state according to the first indication signal, or to close when the energy storage module is in a non-discharging state according to the first indication signal.

8. The power supply circuit according to claim 2, characterized in that, The second detection circuit includes: The second switching unit has its first terminal connected to the feedback terminal of the high-voltage auxiliary power source module and its second terminal grounded. The second switching unit is used to close when the output voltage is greater than or equal to the preset voltage threshold according to the second indication signal, or to open when the output voltage is less than the preset voltage threshold according to the second indication signal.

9. The power supply circuit according to claim 2, characterized in that, The first detection circuit includes: A current sampling unit is connected in series with the primary coil to form a first current sampling circuit, or connected in series with the negative output line of the energy storage module to form a second current sampling circuit; the current sampling unit is used to determine the charging and discharging state of the energy storage module according to the current direction in the first current sampling circuit, or to determine the charging and discharging state of the energy storage module according to the current direction in the second current sampling circuit.

10. An energy storage system, characterized in that, The energy storage system includes a power supply circuit as described in any one of claims 1-9, wherein the power conversion module in the power supply circuit is a photovoltaic module.

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