Auxiliary power, energy storage converter and energy storage converter system

Abstract

The application provides an auxiliary power supply, an energy storage converter and an energy storage conversion system, and relates to the technical field of electrochemical energy storage. The auxiliary power supply comprises an alternating-current auxiliary power supply system, which comprises a second switch, a second transformer, a second rectifier circuit, a third rectifier circuit and a fourth rectifier circuit. The third rectifier circuit is connected with the first end of the second transformer through the second switch, the second end of the second transformer is connected with the second rectifier circuit, and the fourth rectifier circuit is connected with the first end of the second transformer through the second switch. According to the scheme provided by the application, the energy storage converter can be powered by only one auxiliary power supply, so that the energy storage converter is powered by the alternating-current auxiliary power supply system, thereby reducing the possible failure points of the energy storage converter, reducing the volume and weight of the energy storage converter, reducing the cost of the energy storage converter, improving the working efficiency of the energy storage converter, and further improving the flexibility and adaptability of the energy storage converter.

Description

Technical Field

[0001] This application belongs to the field of electrochemical energy storage technology, and particularly relates to an auxiliary power supply, an energy storage converter, and an energy storage converter system. Background Technology

[0002] A power conversion system (PCS) is a bidirectional power conversion device that connects a battery system to the power grid. It can control the charging and discharging process of the battery system, regulate the power of the power grid, and obtain battery status information through a communication interface.

[0003] In related technologies, a PCS can include multiple converter branches, each of which is the smallest unit for converting AC and DC power. Furthermore, each converter branch can correspond to an auxiliary power supply system, which supplies power to the various circuit structures and main control chip within that converter branch.

[0004] However, PCS includes multiple converter branches, which correspond to multiple auxiliary power supply systems, leading to an increase in the overall single-point failure rate of PCS and consequently increasing the cost of PCS. Utility Model Content

[0005] This application provides an auxiliary power supply, an energy storage converter, and an energy storage converter system, which solves the problem in related technologies where setting up multiple auxiliary power supply systems in a PCS leads to an increased single-point failure rate of the PCS as a whole, and correspondingly increases the cost of the PCS.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, embodiments of this application provide an auxiliary power supply, the auxiliary power supply comprising: an AC auxiliary power supply system;

[0008] The AC auxiliary power supply system includes: a second switch, a second transformer, a second rectifier circuit, a third rectifier circuit, and a fourth rectifier circuit;

[0009] The third rectifier circuit is connected to the first terminal of the second transformer via the second switch, and the second terminal of the second transformer is connected to the second rectifier circuit.

[0010] The fourth rectifier circuit is connected to the first terminal of the second transformer via the second switch.

[0011] Optionally, the auxiliary power supply further includes: a DC auxiliary power supply system;

[0012] The DC auxiliary power supply system includes: a first switch, a first transformer, and a first rectifier circuit;

[0013] The first terminal of the first transformer is connected to the second terminal of the first switch, and the second terminal of the first transformer is connected to the first rectifier circuit.

[0014] The first rectifier circuit, the second rectifier circuit, the third rectifier circuit, and the fourth rectifier circuit all include power switching devices.

[0015] Optionally, the auxiliary power supply further includes a heat sink, wherein the power switching devices in the first switch, the second switch, the first rectifier circuit, the second rectifier circuit, the third rectifier circuit, and the fourth rectifier circuit are all arranged on the heat sink.

[0016] Optionally, the radiator includes at least two heat sinks, with the first transformer and the second transformer arranged between the at least two heat sinks.

[0017] Optionally, the radiator further includes an upper cover plate located above at least two of the heat sink plates and attached to the first transformer and the second transformer via a thermally conductive material.

[0018] Secondly, embodiments of this application provide an energy storage converter, the energy storage converter comprising: an auxiliary power supply as described in any one of the first aspects, at least one converter branch, a first AC interface, a second AC interface, and at least one first DC interface;

[0019] The power grid is connected to the first terminal of the third rectifier circuit in the auxiliary power supply through the first AC interface;

[0020] The AC source is connected to the first end of the fourth rectifier circuit in the auxiliary power supply through the second AC interface.

[0021] Optionally, the energy storage converter further includes: a DC selection circuit;

[0022] For each of the at least one first DC interface, the first terminal of the DC selection circuit is connected to a corresponding battery cluster through the first DC interface;

[0023] The second terminal of the DC selection circuit is connected to the first terminal of the first switch.

[0024] Optionally, the DC selection circuit includes: at least one first diode and at least one second diode;

[0025] The first terminal of each of the at least one first diodes is connected to the positive terminal of each of the first DC interfaces;

[0026] The first terminal of each of the at least one second diode is connected to the negative terminal of each of the first DC interfaces.

[0027] Optionally, the energy storage converter further includes: a soft-start circuit and a bus capacitor;

[0028] The first terminal of the soft-start circuit is connected to the second terminal of the first transformer in the auxiliary power supply and the second terminal of the second transformer in the auxiliary power supply, respectively.

[0029] The second terminal of the soft-start circuit is connected to the bus capacitor.

[0030] Thirdly, embodiments of this application provide an energy storage converter system, characterized in that the energy storage converter system includes: an AC source and an energy storage converter as described in any one of the second aspects.

[0031] This application provides an auxiliary power supply, including an AC auxiliary power supply system. The AC auxiliary power supply system may include a second switch, a second transformer, a second rectifier circuit, a third rectifier circuit, and a fourth rectifier circuit. The third rectifier circuit is connected to a first terminal of the second transformer via the second switch, the second terminal of the second transformer is connected to the second rectifier circuit, and the fourth rectifier circuit is connected to the first terminal of the second transformer via the second switch. The solution provided in this application connects the auxiliary power supply in the energy storage converter to at least one converter branch, allowing the energy storage converter to be powered by only one auxiliary power supply. This enables the energy storage converter to be powered by either a DC or AC auxiliary power supply system according to actual needs, thereby reducing potential failure points, decreasing the size and weight of the energy storage converter, lowering its cost, improving its operating efficiency, and ultimately enhancing its flexibility and adaptability.

[0032] Furthermore, by using the third and fourth rectifier circuits, different AC input voltages can be matched respectively, thereby narrowing the DC voltage range of the input to the second transformer, that is, narrowing the gap between the maximum and minimum input voltages, and thus reducing the size, weight and cost of the second transformer. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an energy storage converter system involving an auxiliary power supply as proposed in an embodiment of this application.

[0034] Figure 2 This is a schematic diagram of the structure of an energy storage converter proposed in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of another energy storage converter proposed in the embodiments of this application;

[0036] Figure 4 This is a schematic diagram of the structure of another energy storage converter proposed in the embodiments of this application;

[0037] Figure 5 This is a schematic diagram of the structure of another energy storage converter proposed in the embodiments of this application;

[0038] Figure 6A This is a schematic diagram of the structure of an auxiliary power supply provided in an embodiment of this application;

[0039] Figure 6B This is a schematic diagram of the structure of an auxiliary power supply provided in an embodiment of this application;

[0040] Figure 7 This is a schematic diagram of another auxiliary power supply provided in an embodiment of this application;

[0041] Figure 8 This is a schematic diagram of another auxiliary power supply provided in an embodiment of this application;

[0042] Figure 9 A top view of a heat sink provided in an embodiment of this application;

[0043] Figure 10 A front view of another heat sink provided in an embodiment of this application. Detailed Implementation

[0044] In the following description, specific details such as particular system architectures and technologies are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known energy storage technologies, energy storage converter control algorithms, and energy storage converters are omitted to avoid unnecessary detail from obscuring the description of this application.

[0045] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “the,” “the,” and “the” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0046] See Figure 1 , Figure 1This is a schematic diagram of an energy storage converter system involving an auxiliary power supply according to an embodiment of this application. The energy storage converter system may include: an energy storage converter 110, at least one battery cluster 120, an energy management system (EMS) 130, and a battery management system (BMS) 140.

[0047] Among them, the energy storage converter (PCS) 110 is connected to the battery cluster 120, EMS 130 and BMS 140 respectively. The battery cluster 120 is also connected to the BMS 140, and the EMS 130 is also connected to the BMS 140.

[0048] Furthermore, the communication connection between PCS110, battery cluster 120, EMS130 and BMS140 can be wireless or wired, and this application embodiment does not specifically limit this.

[0049] In addition, the connection between PCS110 and battery cluster 120 may also include a power connection. The power connection is a current channel and belongs to a wired connection. The connection method can be a cable, copper busbar, etc. This application embodiment does not specifically limit this.

[0050] During operation, the energy storage converter system can monitor the battery cluster 120 via the BMS140, determine various battery information of the battery cluster 120, and send this information to the EMS130. Correspondingly, the EMS130 can receive this battery information, analyze it, and determine the charging and discharging decisions for the energy storage converter system. Then, the EMS130 can send these charging and discharging decisions to the PCS110, which can then charge or discharge the battery cluster 120 based on the received decisions.

[0051] In some alternative embodiments, the energy storage converter system may further include an AC source. For example, the AC source may be an uninterruptible power supply (UPS). Furthermore, the energy storage converter 110 may include an auxiliary power supply, to which the UPS can be connected, so that in the event of a grid anomaly, the UPS can supply power to the auxiliary power supply, enabling the auxiliary power supply to soft-start the energy storage converter 110 and thus improving the reliability of the energy storage converter 110.

[0052] Furthermore, such as Figure 2 As shown, Figure 2This is a schematic diagram of the structure of an energy storage converter proposed in an embodiment of this application. The energy storage converter includes: an auxiliary power supply 111, at least one converter branch 112, a first AC interface 113, at least one first DC interface 114, and a second AC interface 115.

[0053] The auxiliary power supply 111 can be connected to the first AC interface 113, thereby connecting to the power grid through the first AC interface 113.

[0054] Specifically, the first end of the third rectifier circuit in the auxiliary power supply 111 can be connected to the first AC interface 113, and the first AC interface 113 can be connected to the power grid, so that the power grid can be connected to the first end of the third rectifier circuit in the auxiliary power supply 111 through the first AC interface 113.

[0055] Similarly, the AC power source can be connected to the first terminal of the fourth rectifier circuit in the auxiliary power supply 111 via the second AC interface 115. When the power grid is abnormal, the auxiliary power supply 111 can be powered by the electrical energy provided by the AC power source.

[0056] Furthermore, the auxiliary power supply 111 can also be connected to at least one first DC interface 114, thereby connecting to the battery cluster 120 through at least one first DC interface 114.

[0057] Specifically, the first terminal of the first switch in the auxiliary power supply 111 can be connected to the second DC interface of any one of the at least one converter branch 112. Correspondingly, each first DC interface 114 can also be connected to the second DC interface of each of the at least one converter branch 112.

[0058] Furthermore, each first DC interface 114 can be connected to a battery cluster 120, thereby allowing the auxiliary power supply 111 to be connected to multiple battery clusters 120 through multiple first DC interfaces 114.

[0059] For example, each first DC interface 114 can correspond one-to-one with each battery cluster 120. Therefore, for each of the at least one first DC interface 114, the first DC interface 114 can be connected to the corresponding battery cluster 120. The first DC interface 114 can also be connected to the second DC interface of each of the at least one converter branch 112.

[0060] In summary, for each converter branch 112, the converter branch 112 can be connected to the power grid through the first AC interface 113, and connected to at least one first DC interface 114 through the second DC interface of the converter branch 112, thereby connecting to at least one battery cluster 120.

[0061] Correspondingly, when the energy storage converter 110 is charging, the converter branch 112 can receive the power from the grid and convert the AC power from the grid into DC power, and then input DC power into the battery cluster 120 to complete the charging of the battery cluster 120.

[0062] Conversely, when the energy storage converter 110 is discharging, the converter branch 112 can draw power from the battery cluster 120, convert the DC power in the battery cluster 120 into AC power, and then transmit the converted AC power to the grid to complete the discharge of the battery cluster 120.

[0063] For example, such as Figure 3 As shown, Figure 3 This is a schematic diagram of another energy storage converter proposed in the embodiments of this application. The following description takes the energy storage converter 110, which includes two converter branches (converter branch 112-1 and converter branch 112-2), as an example.

[0064] It should be noted that, Figure 3 The left side of each component of the energy storage converter 110 shown is the first terminal, and the right side is the second terminal.

[0065] The energy storage converter 110 may include two first DC interfaces (first DC interface 110-1D and first DC interface 110-2D) and one set of first AC interfaces 110-A. Moreover, each first DC interface may include a first positive DC interface and a first negative DC interface, and the set of first AC interfaces may include three AC interfaces: A, B, and C.

[0066] Specifically, each first AC interface can be connected to each battery cluster 120, i.e., 110-1D is connected to battery cluster 120-1, and 110-2D is connected to battery cluster 120-2. The first AC interface is connected to the power grid 150, so that it can receive power from the power grid through the converter branch 112 to charge the battery cluster 120, or release the power stored in the battery cluster 120 into the power grid.

[0067] In addition, each converter branch 112 may include: a second DC interface and a set of second AC interfaces, namely, the second DC interface of 112-1 is 112-1D, the second DC interface of 112-2 is 112-2D, the second AC interface of 112-1 is 112-1A, and the second AC interface of 112-2 is 112-2A. The DC interface typically includes two interfaces, positive and negative; because the power grid provides three-phase AC power, a set of AC interfaces typically includes three interfaces, A, B, and C (not shown in the figure).

[0068] Accordingly, 110-1D is connected to 112-1D, and 110-2D is connected to 112-2D. The first AC interface is connected in parallel with the second AC interface of each of the multiple converter branches. That is, the first AC interface 110-A is connected in parallel with 112-1A and 112-2A.

[0069] Furthermore, the energy storage converter 110 may also include an auxiliary power supply 111, and each converter branch 112 may also include an auxiliary power supply unit.

[0070] Among them, converter branch 112-1 may include auxiliary power supply unit 113-1, and converter branch 112-2 may include auxiliary power supply unit 113-2.

[0071] Specifically, the auxiliary power supply 111 can be connected to the auxiliary power supply unit in each converter branch 112, so that the auxiliary power supply 111 can supply power to each auxiliary power supply unit. In turn, the auxiliary power supply 111 can supply power to at least one converter branch 111-1 and converter branch 111-2 in the converter branch 112. This can reduce the total number of failure points of the energy storage converter 110, and at the same time reduce the size and weight of the energy storage converter 110. Furthermore, it can reduce the cost of the energy storage converter 110 and improve the efficiency of the energy storage converter 110.

[0072] In one alternative embodiment, see Figure 4 , Figure 4 This is a schematic diagram of another energy storage converter proposed in the embodiments of this application. The energy storage converter may also include: DC selection circuit 116.

[0073] Specifically, for each of the at least one first DC interface 114, the first end of the DC selection circuit 116 can be connected to a corresponding battery cluster through the first DC interface 114.

[0074] For example, the first terminal of the DC selection circuit 116 can be connected to the second DC interface of each of at least one converter branch 112, thereby connecting to each battery cluster 120 through each first DC interface 114.

[0075] Furthermore, the second terminal of the DC selection circuit 116 can be connected to the first terminal of the first switch in the auxiliary power supply 111.

[0076] Specifically, during the startup of the energy storage converter 110, if there is an anomaly in the power grid, power can be drawn from the battery clusters 120. Correspondingly, the DC selection circuit 116 can select the battery cluster 120 with the highest voltage from among the multiple battery clusters 120, so that the auxiliary power supply 111 can be powered by the battery cluster 120 with the highest voltage.

[0077] Furthermore, such as Figure 4 As shown, the DC selection circuit 116 may include at least one first diode 116a and at least one second diode 116b.

[0078] In this configuration, the first terminal of each of the at least one first diode 116a is connected to the positive terminal of the second DC interface of each converter branch 112. Similarly, the first terminal of each of the at least one second diode 116b is connected to the negative terminal of the second DC interface of each converter branch 112.

[0079] In another alternative embodiment, see Figure 5 , Figure 5 This is a schematic diagram of another energy storage converter proposed in the embodiments of this application. The energy storage converter also includes a soft-start circuit 117 and a bus capacitor 118.

[0080] The first end of the soft start circuit 117 can be connected to the auxiliary power supply 111, and the second end of the soft start circuit 117 can be connected to the bus capacitor 118. Thus, during the soft start process of the energy storage converter, the soft start circuit 117 can suppress the power-on inrush current when the energy storage converter starts up, and the bus capacitor 118 can increase the voltage, so that the energy storage system can achieve smooth grid connection when connected to the grid.

[0081] For example, the first terminal of the soft start circuit 117 can be connected to the second terminal of the first transformer in the auxiliary power supply 111 and the second terminal of the second transformer in the auxiliary power supply 111, so that the soft start circuit 117 is powered by the auxiliary power supply 111.

[0082] It should be noted that, in practical applications, each converter branch 112 may further include an auxiliary power supply unit, which may include a power control circuit, a sampling circuit, a drive circuit, an operational amplifier circuit, a communication circuit, and a main control chip. Correspondingly, the auxiliary power supply 111 can be used to power one or more of the power control circuit, sampling circuit, drive circuit, operational amplifier circuit, communication circuit, and main control chip in the auxiliary power supply unit of each converter branch 112.

[0083] The auxiliary power supply in the above-mentioned energy storage converter is described in detail below.

[0084] Figure 6A A schematic diagram of an auxiliary power supply provided in an embodiment of this application is shown below. Figure 6AThe auxiliary power supply 111 may include an AC auxiliary power supply system 620. The AC auxiliary power supply system 620 may include a second transformer 621, a third rectifier circuit 622, a second switch 623, a second rectifier circuit 624, and a fourth rectifier circuit 625.

[0085] The first end of the third rectifier circuit 622 can be connected to the second AC interface of each converter branch in the power grid or energy storage converter. The second end of the third rectifier circuit 622 can be connected to the first end of the second transformer 621 through the second switch 623. The second end of the second transformer 621 can be connected to the second rectifier circuit 624.

[0086] Furthermore, the fourth rectifier circuit 625 can be connected to the first terminal of the second transformer 621 via the second switch 623. The potential at the first terminal of the fourth rectifier circuit 625 can be lower than the potential at the first terminal of the third rectifier circuit 622, thus allowing for adaptation to different input AC voltages via the third rectifier circuit 622 and the fourth rectifier circuit 625.

[0087] For example, the third rectifier circuit 622 can be an uncontrolled rectifier circuit, and the fourth rectifier circuit 625 can be a voltage doubler rectifier circuit. The uncontrolled rectifier circuit can convert 690 volts (V) AC voltage to 975V DC voltage, and the voltage doubler rectifier circuit can convert 220V AC voltage to 600V DC voltage. This can reduce the range of the input voltage of the second transformer 621, thereby reducing the size, weight and cost of the second transformer 621.

[0088] Specifically, the third rectifier circuit 622 converts the AC power from the power grid into DC power. The DC power is then converted into a third pulse source by the second switch 623. This third pulse source is then converted into a fourth pulse source (e.g., a 24V pulse source) by the second transformer 621. The second rectifier circuit then rectifies the fourth pulse source back into 24V DC power. The amplitude of this fourth pulse source is matched to the DC output voltage required by the various components within the energy storage converter.

[0089] The amplitude of the second pulse source can be the rated voltage required by the energy storage converter, such as 5V, 12V or 24V. This application embodiment does not specifically limit this.

[0090] For example, see Figure 6B , Figure 6BThis is a schematic diagram of another auxiliary power supply provided in an embodiment of this application. The auxiliary power supply includes: a third rectifier circuit 622 composed of a full-bridge rectifier circuit, a fourth rectifier circuit 625 composed of a voltage doubler rectifier circuit, two second switches 623, three second transformers 621, and three second rectifier circuits 624. The input to the third rectifier circuit 622 is 690VAC (690V AC), and the input to the fourth rectifier circuit 625 is 220VAC.

[0091] It should be noted that in practical applications, the second transformer 621 needs to convert the input voltage to 24V DC, so the second transformer 621 needs to have different parameters.

[0092] For example, the input voltage of the energy storage converter is a DC voltage of 1000V to 1500V, and the rated AC voltage is 690V. Correspondingly, the input of the AC auxiliary power supply system 620 can be a 690V AC voltage (within ±15% of the mains voltage fluctuation range), the output voltage of the third rectifier circuit 622 is a 975V DC voltage, and the second transformer 621 can convert the 975V DC voltage to a 24V DC voltage.

[0093] However, the energy storage converter system also includes a UPS, which can provide auxiliary power when the power grid is abnormal. Since the UPS provides 220V AC voltage, there is a significant difference between the AC voltage provided by the battery clusters.

[0094] Therefore, AC voltages of different ranges can be converted using the fourth rectifier circuit 625. The process by which the fourth rectifier circuit 625 converts AC voltage to DC voltage is similar to that of the third rectifier circuit 622, and will not be described in detail here.

[0095] See Figure 7 , Figure 7 This is a schematic diagram of another auxiliary power supply provided in an embodiment of the present application. The auxiliary power supply 111 may further include: a DC auxiliary power supply system 610, which may include: a first transformer 611, a first switch 612 and a first rectifier circuit 613.

[0096] The first rectifier circuit 613, the second rectifier circuit 624, the third rectifier circuit 622 and the fourth rectifier circuit 625 may each include power switching devices.

[0097] Specifically, the first terminal of the first transformer 611 can be connected to the second terminal of the first switch 612, and the second terminal of the first transformer 611 can be connected to the first rectifier circuit 613. Correspondingly, the first terminal of the first transformer 611 can be connected to the DC interface of each converter branch in the energy storage converter through the first switch 612, and the second terminal of the first transformer 611 can be connected to the first rectifier circuit 613.

[0098] Specifically, the first switch 612 converts the DC power supply into a first pulse source, which is then converted into a second pulse source by the first transformer. The first rectifier circuit 613 then rectifies the second pulse source back into DC power. The first transformer is used to change the amplitude of the first pulse source to obtain the second pulse source. The amplitude of the second pulse source matches the DC output voltage required by the various components within the energy storage converter; that is, the DC output amplitude of the first rectifier circuit is 24V.

[0099] It should be noted that in practical applications, the auxiliary power supply 111 can preferentially draw power from the grid through the AC auxiliary power supply system 620 to supply power to the energy storage converter 110. When the grid is abnormal, power can be drawn from any battery cluster through the DC auxiliary power supply system 610 to supply power to the energy storage converter 110.

[0100] It should also be noted that the first switch 612 and the second switch 623 can both be metal oxide semiconductor field effect transistors (MOSFETs) or other switching devices used to convert direct current into pulsed current. The embodiments of this application do not specifically limit the type and function of the first switch 612 and the second switch 623.

[0101] Furthermore, the outputs of the first transformer 611 and the second transformer 621 can be pulses with at least one amplitude of 5V, 12V, or 24V, the amplitude of which matches the DC output voltage required by the various components within the energy storage converter. This application does not specifically limit this aspect in its embodiments. This application uses 24V as an example for illustration.

[0102] See Figure 8 , Figure 8 This is a schematic diagram of another auxiliary power supply provided in an embodiment of this application. The auxiliary power supply 111 may also include a heat sink 630.

[0103] In this circuit, the power switching devices in the first switch 612, the second switch 623, the first rectifier circuit 613, the second rectifier circuit 624, the third rectifier circuit 622, and the fourth rectifier circuit 625 are all arranged on the heat sink 630, so that the heat sink 630 can dissipate heat from each power switching device.

[0104] Moreover, see Figure 9 , Figure 9 The present application provides a top view of a heat sink 630, which may include at least two heat sink plates 631.

[0105] The first transformer 611 and the second transformer 621 can be arranged between at least two heat sinks 631.

[0106] Correspondingly, the heat dissipated by the first transformer 611 and the second transformer 621 can be absorbed by the heat dissipation plates 631 arranged around the first transformer 611 and the second transformer 621, and then the absorbed heat can be dissipated by the side of the heat dissipation plates 631 away from the first transformer 611 and the second transformer 621, thereby achieving the effect of heat dissipation for the first transformer 611 and the second transformer 621.

[0107] Additionally, see Figure 10 , Figure 10 This is a front view of another heat sink provided in an embodiment of this application. The heat sink 630 may also include: an upper cover plate 632.

[0108] The upper cover plate 632 can be located above at least two heat sinks 631 and is attached to the first transformer 611 and the second transformer 621 via thermally conductive material.

[0109] Furthermore, the process of heat dissipation through the upper cover plate 632 is similar to that of heat dissipation through the heat sink plate 631, and will not be described in detail here.

[0110] In summary, the auxiliary power supply proposed in this application includes an AC auxiliary power supply system, which may include a second switch, a second transformer, a second rectifier circuit, a third rectifier circuit, and a fourth rectifier circuit. The third rectifier circuit is connected to the first terminal of the second transformer via the second switch, the second terminal of the second transformer is connected to the second rectifier circuit, and the fourth rectifier circuit is connected to the first terminal of the second transformer via the second switch.

[0111] The solution provided in this application connects the auxiliary power supply in the energy storage converter to at least one converter branch, allowing the energy storage converter to be powered by only one auxiliary power supply. This enables the energy storage converter to be powered by either a DC auxiliary power supply system or an AC auxiliary power supply system as needed, thereby reducing potential failure points, decreasing the size and weight of the energy storage converter, lowering its cost, improving its efficiency, and ultimately enhancing its flexibility and adaptability.

[0112] Furthermore, by using the third and fourth rectifier circuits, different AC input voltages can be matched respectively, thereby narrowing the DC voltage range of the input to the second transformer, that is, narrowing the gap between the maximum and minimum input voltages, and thus reducing the size, weight and cost of the second transformer.

[0113] Furthermore, this application also proposes an energy storage converter, comprising: at least one converter branch and an auxiliary power supply, wherein the auxiliary power supply is connected to a battery cluster and connected to the power grid through at least one converter branch. By supplying power to multiple converter branches through a single auxiliary power supply, the potential failure points of the energy storage converter can be reduced, its size and weight can be decreased, its cost can be lowered, and its operating efficiency can be improved, thereby enhancing the flexibility and adaptability of the energy storage converter.

[0114] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0115] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0116] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0117] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0118] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0119] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0120] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0121] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An auxiliary power supply, characterized in that, The auxiliary power supply includes: an AC auxiliary power supply system; The AC auxiliary power supply system includes: a second switch, a second transformer, a second rectifier circuit, a third rectifier circuit, and a fourth rectifier circuit; The third rectifier circuit is connected to the first terminal of the second transformer via the second switch, and the second terminal of the second transformer is connected to the second rectifier circuit. The fourth rectifier circuit is connected to the first terminal of the second transformer via the second switch.

2. The auxiliary power supply according to claim 1, characterized in that, The auxiliary power supply also includes: a DC auxiliary power supply system; The DC auxiliary power supply system includes: a first switch, a first transformer, and a first rectifier circuit; The first terminal of the first transformer is connected to the second terminal of the first switch, and the second terminal of the first transformer is connected to the first rectifier circuit. The first rectifier circuit, the second rectifier circuit, the third rectifier circuit, and the fourth rectifier circuit all include power switching devices.

3. The auxiliary power supply according to claim 2, characterized in that, The auxiliary power supply further includes a heat sink, and the power switching devices in the first switch, the second switch, the first rectifier circuit, the second rectifier circuit, the third rectifier circuit, and the fourth rectifier circuit in the auxiliary power supply are all arranged on the heat sink.

4. The auxiliary power supply according to claim 3, characterized in that, The radiator includes at least two heat sinks, with the first transformer and the second transformer arranged between the at least two heat sinks.

5. The auxiliary power supply according to claim 4, characterized in that, The radiator further includes an upper cover plate, which is located above at least two of the heat sink plates and is attached to the first transformer and the second transformer via a thermally conductive material.

6. An energy storage converter, characterized in that, The energy storage converter includes: an auxiliary power supply as described in any one of claims 1 to 5, at least one converter branch, a first AC interface, a second AC interface, and at least one first DC interface; The power grid is connected to the first terminal of the third rectifier circuit in the auxiliary power supply through the first AC interface; The AC source is connected to the first end of the fourth rectifier circuit in the auxiliary power supply through the second AC interface.

7. The energy storage converter according to claim 6, characterized in that, The energy storage converter also includes: a DC selection circuit; For each of the at least one first DC interface, the first terminal of the DC selection circuit is connected to a corresponding battery cluster through the first DC interface; The second terminal of the DC selection circuit is connected to the first terminal of the first switch.

8. The energy storage converter according to claim 7, characterized in that, The DC selection circuit includes: at least one first diode and at least one second diode; The first terminal of each of the at least one first diodes is connected to the positive terminal of each of the first DC interfaces; The first terminal of each of the at least one second diode is connected to the negative terminal of each of the first DC interfaces.

9. The energy storage converter according to any one of claims 6 to 8, characterized in that, The energy storage converter also includes: a soft-start circuit and a bus capacitor; The first terminal of the soft-start circuit is connected to the second terminal of the first transformer in the auxiliary power supply and the second terminal of the second transformer in the auxiliary power supply, respectively. The second terminal of the soft-start circuit is connected to the bus capacitor.

10. An energy storage converter system, characterized in that, The energy storage converter system includes: an AC source and an energy storage converter as described in any one of claims 6 to 9.

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