Auxiliary source power supply circuit of energy storage equipment, auxiliary source power supply device and energy storage equipment

Abstract

The invention discloses an auxiliary source power supply circuit of energy storage equipment, an auxiliary source power supply device and the energy storage equipment, the energy storage equipment comprises a power conversion unit and a control unit, the power conversion unit comprises a direct current input end and an alternating current input end, and the control unit is used for controlling the power conversion unit to carry out alternating current and direct current conversion; the auxiliary source power supply circuit comprises a rectification module which is connected with the AC input end; the relay switch is connected with the rectifier module; the power input end of the auxiliary source conversion unit is connected with the relay switch and the direct current input end, and the power output end is connected with the control unit; the single relay switch is arranged between the auxiliary source conversion unit and the rectification module, when the direct current voltage of the direct current input end exceeds the preset voltage range, the relay switch is switched on, and the current of the alternating current input end sequentially passes through the rectification module, the relay switch and the auxiliary source conversion unit to supply power to the control unit. The size and the cost of the auxiliary source power supply circuit can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to an auxiliary source power supply circuit, an auxiliary source power supply device and energy storage equipment for energy storage equipment. Background Art

[0002] At present, energy storage devices for converting AC power into DC for storage generally include a DC input terminal, a power conversion unit and an AC input terminal connected in sequence, and include a control unit and an auxiliary power supply circuit, wherein the control unit is used to control the power conversion unit to convert DC into AC, and the auxiliary source conversion unit in the auxiliary power supply circuit is used to provide a stable low-voltage power supply to control units such as a control circuit and a drive circuit based on the input of the DC input terminal or the AC input terminal, so as to ensure that the control circuit and the drive circuit can work stably and reliably.

[0003] However, in the traditional auxiliary source power supply circuit design, the input end of the auxiliary source conversion unit is connected to the AC input end through the rectifier module. In order to realize the on-off control of the AC input conversion branch corresponding to the auxiliary source conversion unit, a plurality of relay switches are usually arranged between the rectifier module and the AC input end. The plurality of relay switches are respectively connected to a plurality of phases in the AC input end. As a result, the traditional auxiliary source power supply circuit needs to spend more control resources and PCB area for the plurality of relay switches, thereby increasing the volume and cost of the auxiliary source power supply circuit. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide an auxiliary source power supply circuit, an auxiliary source power supply device and an energy storage device for an energy storage device. By setting a single relay switch between the auxiliary source conversion unit and the rectifier module, the on-off control of the AC input conversion branch is realized, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0005] In a first aspect, an embodiment of the present invention provides an auxiliary source power supply circuit of an energy storage device, wherein the energy storage device includes a power conversion unit and a control unit, wherein the power conversion unit includes a DC input terminal and an AC input terminal, and the control unit is used to control the power conversion unit to perform AC-DC conversion; the auxiliary source power supply circuit includes: a rectifier module connected to the AC input terminal; a relay switch connected to the rectifier module; an auxiliary source conversion unit, including a power input terminal and a power output terminal, wherein the power input terminal is respectively connected to the relay switch and the DC input terminal, and the power output terminal is connected to the control unit; wherein, when the DC voltage of the DC input terminal exceeds a preset voltage range, the relay switch is turned on, and the current of the AC input terminal passes through the rectifier module, the relay switch and the auxiliary source conversion unit in sequence to supply power to the control unit.

[0006] According to an embodiment of the present invention, an auxiliary source power supply circuit of an energy storage device is provided, which has at least the following beneficial effects: the auxiliary source power supply circuit of the energy storage device can be applied to the energy storage device, the energy storage device includes a power conversion unit and a control unit, the power conversion unit includes a DC input end and an AC input end, the control unit is used to control the power conversion unit to perform AC-DC conversion, and the auxiliary source power supply circuit includes: a rectifier module connected to the AC input end; a relay switch connected to the rectifier module; the auxiliary source conversion unit includes a power input end and a power output end, the power input end is respectively connected to the relay switch and the DC input end, and the power output end is connected to the control unit; wherein it can be understood that the embodiment of the present invention realizes on-off control of the AC input conversion branch by setting the relay switch between the auxiliary source conversion unit and the rectifier module, connecting the input end of the auxiliary source conversion unit and the output end of the rectifier module through a single relay switch, switching the connection state of the auxiliary source conversion unit and the rectifier module, and because the relay switch does not need to be directly connected to multiple phases of the AC input end, it can avoid the consumption of control resources and PCB area caused by setting multiple relay switches between the rectifier module and the AC input end in the traditional solution, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0007] In some embodiments, the AC input terminal includes a two-phase AC input terminal and a three-phase AC input terminal.

[0008] In some embodiments, when the DC voltage does not exceed the voltage range, the relay switch is disconnected, and the current at the DC input end passes through the auxiliary source conversion unit to supply power to the control unit.

[0009] In some embodiments, the rectifier module includes a positive output terminal and a negative output terminal, the relay switch includes a double-pole relay, the two input terminals of the double-pole relay are respectively connected to the positive output terminal and the negative output terminal, and the two output terminals of the double-pole relay are connected to the auxiliary source conversion unit.

[0010] In some embodiments, the double-pole relay includes a first double-pole switch and a second double-pole switch connected in series, and when the DC voltage does not exceed the voltage range, the first double-pole switch and the second double-pole switch are both disconnected.

[0011] In some embodiments, the rectifier module includes a plurality of rectifier bridges, and the plurality of rectifier bridges are respectively connected to a plurality of the AC input terminals.

[0012] In some embodiments, the rectifier module further includes a filter capacitor connected in parallel with the rectifier bridge.

[0013] In some embodiments, the auxiliary source conversion unit includes a DC conversion circuit and a filter capacitor connected in parallel with the DC conversion circuit, which is used to perform DC step-down conversion on the current at the power input end to output low-voltage DC power to the control unit.

[0014] In some embodiments, the control unit is also connected to the control end of the relay switch for controlling the relay switch and sending a control signal to the relay switch according to the DC voltage to turn on the relay switch when the DC voltage exceeds the voltage range.

[0015] In some embodiments, the positive electrode of the DC input terminal is connected to the auxiliary source conversion unit through a first diode arranged in a forward direction, and the negative electrode of the DC input terminal is connected to the auxiliary source conversion unit through a second diode arranged in a reverse direction.

[0016] In a second aspect, an embodiment of the present invention provides an auxiliary power supply device, comprising the auxiliary power supply circuit of the energy storage device described in any one of the first aspects.

[0017] According to an embodiment of the present invention, an auxiliary source power supply device is provided, which has at least the following beneficial effects: the auxiliary source power supply circuit in the auxiliary source power supply device can be applied to an energy storage device, the energy storage device includes a power conversion unit and a control unit, the power conversion unit includes a DC input terminal and an AC input terminal, the control unit is used to control the power conversion unit to perform AC-DC conversion, and the auxiliary source power supply circuit includes: a rectifier module connected to the AC input terminal; a relay switch connected to the rectifier module; the auxiliary source conversion unit includes a power input terminal and a power output terminal, the power input terminal is respectively connected to the relay switch and the DC input terminal, and the power output terminal is connected to the control unit; wherein it can be understood that the embodiment of the present invention is to set the relay switch between the auxiliary source conversion unit and the rectifier module, connect the input terminal of the auxiliary source conversion unit and the output terminal of the rectifier module through a single relay switch, switch the connection state of the auxiliary source conversion unit and the rectifier module, and realize the on-off control of the AC input conversion branch. Since the relay switch does not need to be directly connected to multiple phases of the AC input terminal, it can avoid the consumption of control resources and PCB area caused by setting multiple relay switches between the rectifier module and the AC input terminal in the traditional solution, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0018] In a third aspect, an embodiment of the present invention provides an energy storage device, comprising the auxiliary source power supply circuit of the energy storage device described in any one of the first aspect, or the auxiliary source power supply device described in the second aspect.

[0019] According to an embodiment of the present invention, an energy storage device is provided, which has at least the following beneficial effects: the auxiliary source power supply circuit in the energy storage device can be applied to the energy storage device, the energy storage device includes a power conversion unit and a control unit, the power conversion unit includes a DC input end and an AC input end, the control unit is used to control the power conversion unit to perform AC-DC conversion, and the auxiliary source power supply circuit includes: a rectifier module connected to the AC input end; a relay switch connected to the rectifier module; the auxiliary source conversion unit includes a power input end and a power output end, the power input end is respectively connected to the relay switch and the DC input end, and the power output end is connected to the control unit; wherein it can be understood that the embodiment of the present invention is to set the relay switch between the auxiliary source conversion unit and the rectifier module, connect the input end of the auxiliary source conversion unit and the output end of the rectifier module through a single relay switch, switch the connection state of the auxiliary source conversion unit and the rectifier module, and realize the on-off control of the AC input conversion branch. Since the relay switch does not need to be directly connected to multiple phases of the AC input end, it can avoid the consumption of control resources and PCB area caused by setting multiple relay switches between the rectifier module and the AC input end in the traditional solution, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0023] Figure 1 This is an optional structural diagram of an auxiliary source power supply circuit provided by an embodiment of the present invention;

[0024] Figure 2 It is an optional structural schematic diagram corresponding to a three-phase AC input terminal in an auxiliary source power supply circuit provided in an embodiment of the present invention;

[0025] Figure 3 This is an optional structural diagram of a double-pole relay in an auxiliary source power supply circuit provided by an embodiment of the present invention;

[0026] Figure 4 This is another optional structural diagram of a double-pole relay in an auxiliary source power supply circuit provided by an embodiment of the present invention;

[0027] Figure 5 This is an optional structural diagram of a rectifier bridge in an auxiliary source power supply circuit provided by an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of an optional structure in which a first diode and a second diode are provided in an auxiliary source power supply circuit provided in an embodiment of the present invention.

[0029] Reference numerals:

[0030] 100, auxiliary power supply circuit; 110, DC input terminal; 120, power conversion unit; 130, AC input terminal; 140, control unit; 150, auxiliary power conversion unit; 160, relay switch; 170, rectifier module. DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0032] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0034] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] At present, energy storage devices for converting AC power into DC for storage generally include a DC input terminal, a power conversion unit and an AC input terminal connected in sequence, and include a control unit and an auxiliary power supply circuit, wherein the control unit is used to control the power conversion unit to convert DC into AC, and the auxiliary source conversion unit in the auxiliary power supply circuit is used to provide a stable low-voltage power supply for control units such as a control circuit and a drive circuit based on the input of the DC input terminal or the AC input terminal, so as to ensure that the control circuit and the drive circuit can work stably and reliably; however, in the traditional auxiliary power supply circuit design, the input terminal of the auxiliary source conversion unit is connected to the AC input terminal through a rectifier module. In order to realize the on-off control of the AC input conversion branch corresponding to the auxiliary source conversion unit, a plurality of relay switches are usually arranged between the rectifier module and the AC input terminal, and the plurality of relay switches are respectively connected to a plurality of phases in the AC input terminal, resulting in the need for the traditional auxiliary power supply circuit to spend more control resources and PCB area for the plurality of relay switches, thereby increasing the volume and cost of the auxiliary power supply circuit.

[0036] Based on this, first of all, reference Figure 1 , Figure 1 It is an optional structural schematic diagram of an auxiliary source power supply circuit provided by an embodiment of the present invention; in the first aspect, an embodiment of the present invention provides an auxiliary source power supply circuit 100 for an energy storage device, the energy storage device includes a power conversion unit 120 and a control unit 140, the power conversion unit 120 includes a DC input terminal 110 and an AC input terminal 130, and the control unit 140 is used to control the power conversion unit 120 to perform AC-DC conversion; the auxiliary source power supply circuit 100 includes: a rectifier module 170, connected to the AC input terminal 130; a relay switch 160, connected to the rectifier module 170; an auxiliary source conversion unit 150, including a power input terminal and a power output terminal, the power input terminal is respectively connected to the relay switch 160 and the DC input terminal 110, and the power output terminal is connected to the control unit 140; wherein, when the DC voltage of the DC input terminal 110 exceeds a preset voltage range, the relay switch 160 is turned on, and the current of the AC input terminal 130 passes through the rectifier module 170, the relay switch 160 and the auxiliary source conversion unit 150 in sequence to supply power to the control unit 140.

[0037] Among them, it can be understood that the embodiment of the present invention sets the relay switch 160 between the auxiliary source conversion unit 150 and the rectifier module 170, connects the input end of the auxiliary source conversion unit 150 and the output end of the rectifier module 170 through a single relay switch 160, switches the connectivity between the auxiliary source conversion unit 150 and the rectifier module 170, and realizes the on-off control of the AC input conversion branch. Since the relay switch 160 does not need to be directly connected to multiple phases in the AC input terminal 130, it can avoid the consumption of control resources and PCB area brought about by the traditional solution of setting multiple relay switches 160 between the rectifier module 170 and the AC input terminal 130, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit 100.

[0038] In some embodiments, the energy storage device can be a device that can store electrical energy and release it when needed. The energy storage device can store energy when there is excess electricity and release it when there is insufficient electricity. For example, it can store energy during the day when solar power generation is high and release it at night or when the power grid fails, so as to ensure the stability and reliability of the power supply.

[0039] In some embodiments, the auxiliary power supply circuit 100 is used to provide a stable low-voltage power supply for the control unit 140, the drive circuit, etc. in the energy storage device, and can switch between DC input and AC input to ensure that the control system can continue to operate normally even when the main power supply fails; the power conversion unit 120 is a component in the energy storage device responsible for converting the form of electrical energy, and can realize conversion between direct current to alternating current (DC-AC), alternating current to direct current (AC-DC), or direct current to direct current (DC-DC). For example, in the present application, the power conversion unit 120 can be a rectifier bridge for performing alternating current to direct current conversion (AC-DC) so as to convert alternating current from the power grid into direct current suitable for battery storage.

[0040] In some embodiments, the control unit 140 may be a controller or microprocessor within the energy storage system, which is used to monitor and adjust the operating status of the entire system, including but not limited to parameters such as voltage, current, temperature, etc., and control the operating mode of each component according to a preset logic, such as when to charge, discharge, and how to respond to external commands; the DC input terminal 110 may be a battery inside the energy storage device or other DC power supply interface, which may be used to receive DC power generated by solar panels, wind turbines or other forms, or to obtain electrical energy from an external DC energy storage device; the AC input terminal 130 may be a public power grid or a power supply interface that generates AC power, allowing the energy storage device to obtain electrical energy from the power grid, which may be used for charging or directly supplied to the load after appropriate conversion.

[0041] In some embodiments, the rectifier module 170 is used to receive AC power from the AC input terminal 130, convert it into DC power, and then pass it to the subsequent circuit part; the relay switch 160 can be used to automatically connect or disconnect the circuit according to the electrical signal. In the present application, the relay switch 160 is used to selectively connect or disconnect the path between the rectifier module 170 and the auxiliary source conversion unit 150, so as to determine whether the DC input or the AC input is used to power the control unit 140; the auxiliary source conversion unit 150 is used to process the DC input or the rectified AC input and provide the control unit 140 with an appropriate voltage level. The auxiliary source conversion unit 150 has a power input terminal and a power output terminal. The power input terminal is used to receive power from the relay switch 160 or the DC input terminal 110, and the power output terminal is used to transmit adjusted low-voltage DC power to the control unit 140.

[0042] In some embodiments, when the DC voltage does not exceed the voltage range, the relay switch 160 is disconnected, and the current of the DC input terminal 110 passes through the auxiliary source conversion unit 150 to power the control unit 140, wherein the preset voltage range can be understood as a safe operating voltage range set by the user. Within this voltage range, the control unit 140 powered by the DC input terminal 110 has normal performance indicators when performing system control. If the voltage of the DC input terminal 110 exceeds this range, the system will switch to using the AC input terminal 130 to power the control unit 140.

[0043] It is worth noting that the auxiliary power supply circuit 100 of the energy storage system is used to provide a stable low-voltage power supply to the control circuit, drive circuit and other control units 140 of the energy storage system to ensure stable and reliable operation of the control circuit and the drive circuit. In the traditional solution, each power supply source is independently designed with a conversion circuit, and the output of the conversion circuit is connected to the low-voltage power supply of the power converter of the energy storage system. The circuit design is complicated. However, the present application can connect the auxiliary power supply circuit 100 with the DC input terminal 110 and the AC input terminal 130, so that the auxiliary power supply circuit 100 draws power from the battery terminal of the DC input and the AC terminal of the AC input to meet the power supply demand of the control unit 140 in the energy storage system. Compared with the traditional solution, the present application connects both the AC and DC supply sources to the input terminal of the auxiliary device, and supplies power to the low-voltage circuit of the power converter of the energy storage system through the DC conversion circuit. Under normal working conditions, when the DC voltage does not exceed the voltage range, the AC input terminal 130 and the DC input terminal 110 are disconnected through the normally closed relay switch 160 to meet the requirements of safety regulations.

[0044] In some embodiments, the AC input terminal 130 includes a two-phase AC input terminal and a three-phase AC input terminal. It can be understood that in the traditional solution, by setting a plurality of relay switches 160 between the rectifier module 170 and the AC input terminal 130, and the plurality of relay switches 160 are respectively connected to a plurality of phases in the AC input terminal 130, the AC input source disconnection mode is realized. In a high-power three-phase system, the following problems will be faced: if the three-phase electricity in the AC input terminal 130 needs to be introduced into the input terminal of the auxiliary source conversion unit 150 of the corresponding auxiliary power supply, the number of required relays will be doubled, such as using a plurality of double-pole relays, or the required relay specifications will be improved, such as using a three-pole relay, which will result in The cost is greatly increased, and the advantage of cost reduction is weakened; if only a single double-pole relay corresponding to single-phase electricity or two-line voltage is introduced, although the number of relays will not increase, a larger capacity capacitor needs to be connected in parallel to the rectifier module 170 to maintain that the input voltage range of the auxiliary power supply is not too wide when there is only AC input, which makes the design of the DC converter more difficult. Therefore, when the AC input terminal 130 is a three-phase AC input terminal, the present application moves the position of the relay switch 160 from the front end of the AC input rectifier module 170 to the rear end of the rectifier module 170. Only a single double-pole relay is needed to control the AC input source of the auxiliary power supply, thereby effectively reducing the volume and cost of the auxiliary power supply circuit 100.

[0045] refer to Figure 2 , Figure 2 is an optional structural diagram corresponding to a three-phase AC input terminal in an auxiliary power supply circuit 100 provided in an embodiment of the present invention; in some embodiments, such as Figure 2 As shown, the AC input terminal 130 can be a three-phase AC input terminal, the DC input terminal 110 can be a DC input source such as an energy storage battery in the energy storage device, and the auxiliary source conversion circuit, the energy storage battery can be connected to the input terminal of the auxiliary source conversion unit 150 as a DC input, the three-phase AC power of the three-phase AC input terminal is connected to the input terminal of the rectifier unit, the output terminal of the rectifier unit is connected to the input terminal of the relay switch 160, the output terminal of the relay switch 160 is connected to the input terminal of the auxiliary source conversion unit 150, and the output terminal of the auxiliary source conversion unit 150 is connected to the input terminal of the control conversion unit to supply power to the control unit 140. When it is detected that the DC voltage of the energy storage battery is within the preset voltage range, the control unit 140 controls the relay switch 160 to be disconnected; when it is detected that the DC voltage of the energy storage battery is not within the preset voltage range, the control unit 140 controls the relay switch 160 to be closed, and a path is formed from the three-phase AC power to the auxiliary source conversion unit 150, and the AC power supplies the control unit 140.

[0046] In some embodiments, the control unit 140, the auxiliary source conversion unit 150 and the rectifier module 170 may be corresponding control circuits, auxiliary source conversion circuits and rectifier circuits, wherein the control circuit can receive input signals, process these signals and generate outputs to control the operation of other devices or systems; the auxiliary source conversion unit 150 may include transformers, filters, etc. to ensure that the output voltage is stable and reliable; the rectifier module 170 may be composed of multiple diode bridges for rectifying alternating current into direct current.

[0047] refer to Figure 3 , Figure 3 1 is an optional structural diagram of a double-pole relay in an auxiliary power supply circuit 100 provided in an embodiment of the present invention; in some embodiments, such as Figure 3 As shown, the rectifier module 170 includes a positive output terminal and a negative output terminal, the relay switch 160 includes a double-pole relay, the two input terminals of the first double-pole switch Q1 in the double-pole relay are respectively connected to the positive output terminal and the negative output terminal, and the two output terminals of the double-pole relay are connected to the auxiliary source conversion unit 150; wherein, the positive pole of direct current represents the direction of current outflow, and the negative pole of direct current represents the direction of current inflow. In the case of the rectifier module 170, the rectified direct current will be output from the positive output terminal and returned through the negative output terminal to form a closed loop. The two terminals are respectively the positive and negative poles of the rectified direct current.

[0048] Among them, it can be understood that by setting a double-pole relay, the double-pole relay has two independent but synchronously operated contact groups, each contact group can connect or disconnect a pair of lines, and the double-pole relay simultaneously controls the on and off of the positive output terminal and the negative output terminal to ensure that the relay switch 160 can connect the output of the rectifier module 170 with the auxiliary source conversion unit 150 when the DC voltage at the DC input terminal 110 exceeds the preset voltage range, or disconnect the connection between the output of the rectifier module 170 and the auxiliary source conversion unit 150 when the DC voltage does not exceed the voltage range.

[0049] refer to Figure 4 , Figure 4 1 is another optional structural diagram of an auxiliary power supply circuit 100 provided in an embodiment of the present invention, in which a double-pole relay is provided; in some embodiments, such as Figure 4 As shown, the double-pole relay is a series double-pole normally closed relay, including a first double-pole switch Q1 and a second double-pole switch Q2 connected in series. When the DC voltage does not exceed the voltage range, the first double-pole switch Q1 and the second double-pole switch Q2 are both disconnected. The series double-pole can better isolate AC and DC to meet safety regulations.

[0050] Among them, it can be understood that the first double-pole switch Q1 and the second double-pole switch Q2 are two independent switches inside the double-pole relay, and the first double-pole switch Q1 and the second double-pole switch Q2 are connected in series to work, that is, only when both are in a closed state, can current pass; conversely, as long as one of them is disconnected, the entire circuit will be cut off, thereby providing additional safety and reliability for the auxiliary source power supply circuit 100 of the energy storage device, ensuring that the circuit is connected only when, for example, the DC voltage does not exceed a preset range. When the DC voltage is normal, the two switches remain in a disconnected state, preventing the DC voltage from the rectifier module. The current of 170 flows to the auxiliary source conversion unit 150, so that the DC input terminal 110 is used for power supply first, and both double-pole switches are disconnected, which can better isolate the AC power of the AC input terminal 130 and the DC power of the DC input terminal 110; in addition, it is worth noting that the first double-pole switch Q1 and the second double-pole switch Q2 are arranged in the same relay switch 160, and the relay switch 160 is a series double-pole normally closed relay. A single series double-pole normally closed relay has lower cost and volume than multiple double-pole relays or a single three-pole relay, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit 100.

[0051] refer to Figure 5 , Figure 5 It is an optional structural diagram of a rectifier bridge in an auxiliary source power supply circuit 100 provided in an embodiment of the present invention; in some embodiments, the rectifier module 170 includes multiple rectifier bridge arms, and the multiple rectifier bridge arms are respectively connected to multiple phases in the AC input terminal 130, wherein each rectifier bridge arm corresponds to a phase of the AC input terminal 130, and the design of multiple rectifier bridge arms can effectively convert multi-phase AC power into smoother DC power, reduce the pulsating component in the output current, and help provide a more stable DC output for subsequent circuits.

[0052] In some embodiments, the rectifier module 170 also includes a filter capacitor connected in parallel with the rectifier bridge, and the filter capacitor is used to eliminate fluctuations and noise in the rectified DC power, making the output DC power more stable to avoid performance degradation or failure due to voltage fluctuations.

[0053] In some embodiments, the auxiliary source conversion unit 150 includes a DC conversion circuit and a filter capacitor connected in parallel with the DC conversion circuit, which is used to perform DC step-down conversion on the current at the power input end to output low-voltage DC power to the control unit 140, wherein the DC conversion circuit is responsible for stepping down the current obtained from the DC input end 110 or from the rectifier module 170 through the relay switch 160, and adjusting it to a low-voltage DC power level suitable for use by the control unit 140. Such a design ensures that even if the input voltage changes, the voltage output to the control unit 140 can remain constant, thereby ensuring stable operation of the system; it can be understood that the present application can further reduce the volume of the auxiliary source power supply circuit 100 by integrating the filter capacitor inside the auxiliary source conversion unit 150.

[0054] In some embodiments, the control unit 140 is also connected to the control end of the relay switch 160 for controlling the relay switch and sending a control signal to the relay switch 160 according to the DC voltage so as to turn on the relay switch 160 when the DC voltage exceeds the voltage range. It can be understood that the control unit 140 is connected to the control end of the relay switch 160 through its control port. When it is detected that the DC voltage exceeds the set safety range, the control unit 140 will generate a corresponding control signal to drive the relay switch 160 to operate, that is, disconnect the first double-pole switch Q1 and the second double-pole switch Q2, so as to quickly switch to the backup AC power supply mode, so as to be able to respond in time under abnormal conditions and protect the hardware from damage.

[0055] refer to Figure 6 , Figure 6 It is an optional structural schematic diagram of setting a first diode and a second diode in an auxiliary power supply circuit 100 provided by an embodiment of the present invention; in some embodiments, the positive electrode of the DC input terminal 110 is connected to the auxiliary source conversion unit 150 through a first diode D1 set in a forward direction, and the negative electrode of the DC input terminal 110 is connected to the auxiliary source conversion unit 150 through a second diode D2 set in a reverse direction, wherein the forward-set D1 allows current to flow from the DC input terminal 110 into the auxiliary source conversion unit 150, which is used to prevent current from flowing in the reverse direction, thereby protecting the DC power supply and other circuit components, and the reverse-set D2 further strengthens the isolation of the negative electrode of the DC input terminal 110, ensuring that even under short-circuit conditions, no current will flow back to the DC input terminal 110, thereby improving the reliability and safety of the entire system.

[0056] In summary, the present application arranges the relay switch between the auxiliary source conversion unit and the rectifier module, and only uses a single series normally closed double-pole relay to achieve on-off control of the AC input conversion branch. Compared with the traditional solution that requires a separate relay for each phase, the number of relays is effectively reduced. Since multiple relays and their associated control lines are no longer required, the occupied area of ​​the printed circuit board can be significantly reduced, and the design complexity and resource consumption of the control system are reduced. In addition, the entire auxiliary source power supply circuit is composed of multiple relatively independent functional modules, including a rectifier module, a relay switch, and an auxiliary source conversion unit. Since the interfaces between the modules are clear, it is easy to expand and upgrade.

[0057] In a second aspect, an embodiment of the present invention provides an auxiliary power supply device, comprising an auxiliary power supply circuit of the energy storage device of any one of the first aspects.

[0058] Among them, it can be understood that the auxiliary source power supply circuit in the auxiliary source power supply device can be applied to the energy storage device, the energy storage device includes a power conversion unit and a control unit, the power conversion unit includes a DC input end and an AC input end, the control unit is used to control the power conversion unit to perform AC-DC conversion, and the auxiliary source power supply circuit includes: a rectifier module, connected to the AC input end; a relay switch, connected to the rectifier module; an auxiliary source conversion unit, including a power input end and a power output end, the power input end is respectively connected to the relay switch and the DC input end, and the power output end is connected to the control unit; Among them, it can be understood that the embodiment of the present invention is to set the relay switch between the auxiliary source conversion unit and the rectifier module, connect the input end of the auxiliary source conversion unit and the output end of the rectifier module through a single relay switch, switch the connection state of the auxiliary source conversion unit and the rectifier module, and realize the on-off control of the AC input conversion branch. Since the relay switch does not need to be directly connected to multiple phases in the AC input end, it can avoid the consumption of control resources and PCB area caused by setting multiple relay switches between the rectifier module and the AC input end in the traditional solution, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0059] In a third aspect, an embodiment of the present invention provides an energy storage device, comprising the auxiliary source power supply circuit of the energy storage device of any one of the first aspect, or the auxiliary source power supply device of the second aspect.

[0060] Among them, it can be understood that the auxiliary source power supply circuit in the energy storage device can be applied to the energy storage device, the energy storage device includes a power conversion unit and a control unit, the power conversion unit includes a DC input end and an AC input end, the control unit is used to control the power conversion unit to perform AC-DC conversion, and the auxiliary source power supply circuit includes: a rectifier module connected to the AC input end; a relay switch connected to the rectifier module; an auxiliary source conversion unit, including a power input end and a power output end, the power input end is respectively connected to the relay switch and the DC input end, and the power output end is connected to the control unit; Among them, it can be understood that the embodiment of the present invention is to set the relay switch between the auxiliary source conversion unit and the rectifier module, connect the input end of the auxiliary source conversion unit and the output end of the rectifier module through a single relay switch, switch the connection state of the auxiliary source conversion unit and the rectifier module, and realize the on-off control of the AC input conversion branch. Since the relay switch does not need to be directly connected to multiple phases in the AC input end, it can avoid the consumption of control resources and PCB area caused by setting multiple relay switches between the rectifier module and the AC input end in the traditional solution, thereby effectively reducing the volume and cost of the auxiliary source power supply circuit.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An auxiliary power supply circuit for an energy storage device, characterized in that: The energy storage device includes a power conversion unit and a control unit, wherein the power conversion unit includes a DC input terminal and an AC input terminal, and the control unit is used to control the power conversion unit to perform AC-DC conversion; the auxiliary power supply circuit includes: A rectifier module connected to the AC input terminal; A relay switch connected to the rectifier module; an auxiliary source conversion unit, comprising a power input terminal and a power output terminal, wherein the power input terminal is respectively connected to the relay switch and the DC input terminal, and the power output terminal is connected to the control unit; When the DC voltage at the DC input terminal exceeds a preset voltage range, the relay switch is turned on, and the current at the AC input terminal passes through the rectifier module, the relay switch and the auxiliary source conversion unit in sequence to supply power to the control unit.

2. The auxiliary source power supply circuit of the energy storage device according to claim 1, characterized in that: The AC input terminal includes a two-phase AC input terminal and a three-phase AC input terminal.

3. The auxiliary source power supply circuit of the energy storage device according to claim 1 or 2, characterized in that: When the DC voltage does not exceed the voltage range, the relay switch is disconnected, and the current at the DC input end passes through the auxiliary source conversion unit to supply power to the control unit.

4. The auxiliary source power supply circuit of the energy storage device according to claim 3, characterized in that: The rectifier module includes a positive output terminal and a negative output terminal, the relay switch includes a double-pole relay, the two input terminals of the double-pole relay are respectively connected to the positive output terminal and the negative output terminal, and the two output terminals of the double-pole relay are connected to the auxiliary source conversion unit.

5. The auxiliary source power supply circuit of the energy storage device according to claim 4, characterized in that: The double-pole relay includes a first double-pole switch and a second double-pole switch connected in series. When the DC voltage does not exceed the voltage range, the first double-pole switch and the second double-pole switch are both disconnected.

6. The auxiliary source power supply circuit of the energy storage device according to claim 4, characterized in that: The rectifier module includes a plurality of rectifier bridges, and the plurality of rectifier bridges are respectively connected to a plurality of the AC input terminals.

7. The auxiliary source power supply circuit of the energy storage device according to claim 5, characterized in that: The rectifier module also includes a filter capacitor connected in parallel with the rectifier bridge.

8. The auxiliary source power supply circuit of the energy storage device according to claim 1, characterized in that: The auxiliary source conversion unit includes a DC conversion circuit and a filter capacitor connected in parallel with the DC conversion circuit, which is used to perform DC step-down conversion on the current at the power input end to output low-voltage DC power to the control unit.

9. The auxiliary source power supply circuit of the energy storage device according to claim 1, characterized in that: The control unit is also connected to the control end of the relay switch for controlling the relay switch and sending a control signal to the relay switch according to the DC voltage so as to turn on the relay switch when the DC voltage exceeds the voltage range.

10. The auxiliary power supply circuit of the energy storage device according to claim 1, characterized in that: The positive electrode of the DC input terminal is connected to the auxiliary source conversion unit through a first diode arranged in a forward direction, and the negative electrode of the DC input terminal is connected to the auxiliary source conversion unit through a second diode arranged in a reverse direction.

11. An auxiliary power supply device, characterized in that: An auxiliary source power supply circuit comprising the energy storage device according to any one of claims 1 to 10.

12. An energy storage device, characterized in that: An auxiliary source power supply circuit comprising the energy storage device according to any one of claims 1 to 10, or an auxiliary source power supply device according to claim 11.

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