Electrically operated circuit breaker, power supply circuit thereof, energy storage converter and energy storage system

Abstract

The utility model relates to an electrically operated circuit breaker, a power supply circuit thereof, an energy storage converter and an energy storage system. A power supply circuit for an electrically operated circuit breaker having a positive power supply terminal, a negative power supply terminal, a first port, and a second port, the power supply circuit including an action member and a switching member, in which both ends of the action member are connected to a negative terminal of the second port and one positive terminal of the second port, respectively, to perform a switching action when a power supply voltage is supplied to both ends; the switch component is configured to respond to the action component to execute the switch action, and conduct the connection between the positive power supply end and the positive terminal of the second port and the connection between the negative power supply end and the negative terminal of the second port; otherwise, conducting the connection between the positive power supply end and the positive terminal of the first port and the connection between the negative power supply end and the negative terminal of the first port. According to the invention, the electric operating mechanism of the circuit breaker can work normally no matter in an off-grid mode or a grid-connected mode.

Description

Technical Field

[0001] The present application relates to the field of electronic and electrical technology, and in particular to an electrically operated circuit breaker and its power supply circuit, energy storage converter, and energy storage system. Background Art

[0002] A power conversion system (PCS) is an electronic device that can perform AC-DC (alternating current-direct current) and DC-AC (direct current-alternating current) conversion between a battery device and the power grid. When the battery device is fully charged, the power conversion system can output excess power to the power grid through DC-AC conversion. When the battery device is low on power, the power conversion system can draw power from the power grid through AC-DC conversion to charge the battery device.

[0003] The switch that controls whether the PCS is connected to the grid typically uses a molded case circuit breaker for manual opening and closing. Circuit breakers with electric operating mechanisms can significantly enhance the user experience. However, the current electric operating mechanisms rely on grid power for proper operation. In off-grid mode (when the grid is out of power), the electric operating mechanisms fail, causing the circuit breaker to malfunction during a grid outage. Summary of the Invention

[0004] The present application provides an electrically operated circuit breaker and its power supply circuit, energy storage converter, and energy storage system, which can enable the electric operating mechanism of the circuit breaker to operate normally regardless of off-grid mode or grid-connected mode.

[0005] The present application provides a power supply circuit of an electrically operated circuit breaker, the electrically operated circuit breaker having a positive power supply terminal, a negative power supply terminal, a first port, and a second port, wherein the on / off state between the first port and the second port is switched based on the power supply voltage between the positive power supply terminal and the negative power supply terminal, the first port and the second port each including a negative terminal and at least one positive terminal; the power supply circuit includes an action component and a switch component, wherein:

[0006] Two ends of the action component are respectively connected to the negative terminal of the second port and a positive terminal of the second port, so as to perform a switching action when a power supply voltage is supplied to both ends;

[0007] The switching component is respectively connected to the positive power supply terminal, the negative power supply terminal, the negative terminal of the first port, a positive terminal of the first port, the negative terminal of the second port, and a positive terminal of the second port, and the switching component is configured to: in response to the action component performing the switching action, conduct the connection between the positive power supply terminal and the positive terminal of the second port and the connection between the negative power supply terminal and the negative terminal of the second port; otherwise, conduct the connection between the positive power supply terminal and the positive terminal of the first port and the connection between the negative power supply terminal and the negative terminal of the first port.

[0008] In some possible implementations, the first port and the second port each include a negative terminal and three positive terminals, and the action component and the switch component are connected to the same positive terminal of the second port.

[0009] In some possible implementations, the first port is a port of the electrically operated circuit breaker used to connect to an electricity storage device, and the second port is a port of the electrically operated circuit breaker used to connect to a power grid.

[0010] In some possible implementations, the action component and the switch component are respectively implemented by an electromagnet of the same intermediate relay and two switch elements.

[0011] In some possible implementations, the two ends of the electromagnet are respectively connected to the negative terminal and the positive terminal of the second port, the static contact of the first switch element of the two switch elements is connected to the positive power supply end, the normally closed moving contact of the first switch element is connected to the positive terminal of the first port to which the switch component is connected, the normally open moving contact of the first switch element is connected to the positive terminal of the second port to which the switch component is connected, the static contact of the second switch element of the two switch elements is connected to the negative power supply end, the normally closed moving contact of the second switch element is connected to the negative terminal of the first port, and the normally open moving contact of the second switch element is connected to the negative terminal of the second port.

[0012] The present application also provides an electrically operated circuit breaker, which is any one of the above-mentioned electrically operated circuit breakers, and includes any one of the above-mentioned power supply circuits.

[0013] In some possible implementations, the electrically operated circuit breaker includes an electrically operated mechanism and a switching mechanism, the switching mechanism is connected between the first port and the second port, the electrically operated mechanism is respectively connected to the switching mechanism and the positive power supply terminal and the negative power supply terminal of the electrically operated circuit breaker, and the electrically operated mechanism is configured to control the on / off state of the switching mechanism based on the power supply voltage between the positive power supply terminal and the negative power supply terminal.

[0014] In some possible implementations, the first port and the second port each include a negative terminal and three positive terminals, and the switch mechanism includes a four-pole single-throw switch connected between the first port and the second port.

[0015] The present application also provides an energy storage converter, which includes: any one of the above-mentioned power supply circuits, and / or any one of the above-mentioned electrically operated circuit breakers.

[0016] The present application also provides an energy storage system, which includes any one of the above-mentioned energy storage converters.

[0017] In an embodiment of the present application, the power supply circuit of the electrically operated circuit breaker can switch to different connection states according to whether the power supply voltage is supplied to both ends of the action component (that is, whether the power supply voltage is supplied between the negative terminal and the positive terminal of the second port) - when the power supply voltage is supplied to both ends of the action component, it means that the power storage device or grid device connected to the second port is normally powered, and thus the switch component can draw power from the positive terminal and the negative terminal of the second port to supply the electrically operated circuit breaker; when the power supply voltage is not supplied to both ends of the action component, it means that the power storage device or grid device connected to the second port is in a power outage state, and thus the switch component needs to switch to drawing power from the positive terminal and the negative terminal of the first port to supply the electrically operated circuit breaker; in this way, when the first port is the power storage device port and the second port is the grid port, whether in off-grid mode or grid-connected mode, the electrically operated circuit breaker can obtain power supply through the above-mentioned power supply circuit, that is, the electric operating mechanism of the circuit breaker can operate normally regardless of whether it is in off-grid mode or grid-connected mode, helping to improve the stability and reliability of products such as circuit breakers, energy storage converters and energy storage systems.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1This is a structural block diagram of a power supply circuit of an electrically operated circuit breaker provided in an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the circuit structure of an electrically operated circuit breaker and its power supply circuit provided in an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of an application scenario of an electrically operated circuit breaker in a comparative example of the present application;

[0023] Figure 4 This is a structural block diagram of an energy storage converter provided in an embodiment of the present application;

[0024] Figure 5 This is a structural block diagram of an energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0026] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limit, but rather indicate the existence of at least one. Words such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0027] Figure 1 This is a structural block diagram of a power supply circuit of an electrically operated circuit breaker provided in an embodiment of the present application. Figure 1The electrically operated circuit breaker 10 has a positive power supply terminal U1, a negative power supply terminal U0, a first port S1, and a second port S2, so as to switch the on / off state between the first port S1 and the second port S2 based on the power supply voltage between the positive power supply terminal U1 and the negative power supply terminal U0 (for example, by electrically controlled opening and closing), wherein the first port S1 includes a negative terminal S1N and at least one positive terminal, and the second port S2 also includes a negative terminal S2N and at least one positive terminal. The power supply circuit 20 includes an action component 21 and a switch component 22, wherein: two ends of the action component 21 are respectively connected to the negative terminal S2N of the second port S2 and a positive terminal S2x of the second port S2, so as to perform a switching action when the power supply voltage is supplied to both ends; the switch component 22 is respectively connected to the positive power supply terminal U1, the negative power supply terminal U0, the negative terminal S1N of the first port S1, a positive terminal S1x of the first port S1, the negative terminal S2N of the second port S2, and a positive terminal S2x of the second port S2, and the switch component 22 is configured to: in response to the action component 21 performing the switching action, conduct the connection between the positive power supply terminal U1 and the positive terminal S2x of the second port S2 and the connection between the negative power supply terminal U0 and the negative terminal S2N of the second port S2; otherwise, conduct the connection between the positive power supply terminal U1 and the positive terminal S1x of the first port S1 and the connection between the negative power supply terminal U0 and the negative terminal S1N of the first port S1.

[0028] In the embodiment of the present application, the power supply circuit 20 of the electrically operated circuit breaker 10 can switch to different connection states according to whether the power supply voltage is supplied to both ends of the action component 21 (that is, whether the power supply voltage is supplied between the negative terminal S2N and the positive terminal S2x in the second port S2). When the power supply voltage is supplied to both ends of the action component 21, it indicates that the power storage device or grid device connected to the second port S2 is normally powered, and thus the switch component 22 can draw power from between the positive terminal S2x and the negative terminal S2N of the second port S2 to supply the electrically operated circuit breaker 10; when the power supply voltage is not supplied to both ends of the action component 21, it indicates that the power storage device or grid device connected to the second port S2 is normally powered. Or the grid equipment is in a power outage state, so the switch component 22 needs to be changed to draw power from the positive terminal and the negative terminal of the first port S1 to supply the electrically operated circuit breaker; in this way, when the first port S1 is the port for connecting the energy storage device and the second port S2 is the grid port, the electrically operated circuit breaker 10 can obtain power supply through the above-mentioned power supply circuit 20 regardless of whether it is in off-grid mode or grid-connected mode, that is, the electric operating mechanism of the circuit breaker 10 can maintain normal operation in off-grid mode (grid power outage, powered by energy storage device) and grid-connected mode (energy storage device is connected to the grid), helping to improve the stability and reliability of products such as circuit breakers, energy storage converters and energy storage systems.

[0029] It should be noted that the electrically operated circuit breaker refers to a component or structure that can control the on / off state between two ports by means of electrical signals under normal working conditions. It may, for example, include an electrically operated mechanism that can perform an action of changing the switch state according to an electrical signal and a switching mechanism whose switch state can be changed by the electrically operated mechanism. One of the requirements for "normal working conditions" is that there is a power supply voltage between its positive power supply terminal U1 and the negative power supply terminal U0 (considering that the switching mechanism is usually passive, the electrically operated mechanism in the electrically operated circuit breaker generally requires power supply to work normally).

[0030] It should also be noted that this article mainly uses the first port S1 as the port of the electrically operated circuit breaker 10 for connecting to the energy storage device and the second port S2 as the port of the electrically operated circuit breaker 10 for connecting to the power grid as an example for explanation, but in other examples, the second port is "the port on the side on which the electrically operated circuit breaker mainly relies on for power supply", and the first port is "the port on the side on which the electrically operated circuit breaker secondarily relies on for power supply when the side on which the electrically operated circuit breaker mainly relies on for power supply is out of power", and in addition to the first port and the second port, the electrically operated circuit breaker may also have other ports.

[0031] In one example, the first port and the second port include the same number of positive terminals (for example, each corresponding to the three-phase power of the power grid and each including three corresponding positive terminals), and the electrically operated circuit breaker is provided with a switch element between each pair of mutually corresponding positive terminals of the first port and the second port, so as to control the on-off state between the first port and the second port by electrically controlling the on-off state of the switch element. In other examples, the first port and the second port include different numbers of positive terminals, and the electrically operated circuit breaker is provided with an electrically controlled switch element only between the positive terminals that have corresponding positive terminals. Furthermore, the implementation of the embodiments of the present application may not be limited to this.

[0032] It should also be noted that the above-mentioned action component refers to a component that can perform an action that can change the switching state of the above-mentioned switching component when a power supply voltage is supplied to both ends, such as the coil or electromagnet in a relay (the switching action is the action of energizing to form a magnetic field to change the position of the switch armature), the light-emitting element in a photocoupler (the switching action is the action of emitting light to change the on-off state of the light-receiving element), the switching transistor in a transistor switching circuit (the switching action is the action of the switching transistor pulling up or down the potential at the gate of the power switching device to make its working area enter the linear and saturation area or the cut-off area), etc.; the above-mentioned switching component is a component arranged corresponding to the above-mentioned action component. As can be seen from the above description, the connection relationship of the switching component 22 is configured so that in an abnormal state (a state in which the action component 21 does not perform a switching action), it conducts the connection between the positive power supply terminal U1 and the positive terminal S1x of the first port S1 and the connection between the negative power supply terminal U0 and the negative terminal S1N of the first port S1 (and disconnects the connection between the positive power supply terminal U1 and the positive terminal S2x of the second port S2 and the connection between the negative power supply terminal U0 and the negative terminal S2N of the second port S2), and in a normal state (a state in which the action component 21 does not perform a switching action), it conducts the connection between the positive power supply terminal U1 and the positive terminal S2x of the second port S2 and the connection between the negative power supply terminal U0 and the negative terminal S2N of the second port S2 (and disconnects the connection between the positive power supply terminal U1 and the positive terminal S1x of the first port S1 and the connection between the negative power supply terminal U0 and the negative terminal S1N of the first port S1). In this way, the power supply circuit 20 draws power from the second port S2 (such as the power grid) to supply the electrically operated circuit breaker 10 under normal conditions, and draws power from the first port S1 (such as the local power storage device) to supply the electrically operated circuit breaker 10 under abnormal conditions when the second port S2 is powered off, thereby enabling the electric operating mechanism of the circuit breaker to operate normally regardless of whether it is in off-grid mode or grid-connected mode.

[0033] Figure 2 This is a schematic diagram of the circuit structure of an electrically operated circuit breaker and its power supply circuit provided in an embodiment of the present application. Figure 2In the embodiment of the present application, the above-mentioned action component 21 and the switch component 22 are respectively realized by the electromagnet M1 of the same intermediate relay KA1 and the two switch elements K1 and K2; moreover, the above-mentioned electric operation circuit breaker 10 includes an electric operation mechanism 11 and a switch mechanism 12, the switch mechanism 12 is connected between the first port S1 and the second port S2, the electric operation mechanism 11 is respectively connected to the switch mechanism 12 and the positive power supply terminal U1 and the negative power supply terminal U0 of the electric operation circuit breaker 10, and the electric operation mechanism 11 is configured based on the positive power supply terminal The power supply voltage between U1 and the negative power supply terminal U0 controls the on-off state of the switching mechanism 12; in addition, the first port S1 includes a negative terminal S1N and three positive terminals S1A, S1B, and S1C, and the second port S2 correspondingly includes a negative terminal S2N and three positive terminals S2A, S2B, and S2C, and the action component 21 and the switch component 22 are connected to the same positive terminal S2C of the second port S2. The above-mentioned switching mechanism 12 includes a four-pole single-throw switch connected between the first port S1 and the second port S2.

[0034] like Figure 2 As shown, in the intermediate relay KA1, the two ends of the electromagnet M1 are respectively connected to the negative terminal S2N and the positive terminal S2C of the second port S2 to which the two ends of the action component 21 are respectively connected, the static contact of the first switch element K1 of the two switching elements is connected to the positive power supply terminal U1, the normally closed moving contact of the first switch element K1 (that is, the moving contact in the closed position when the electromagnet M1 is not energized) is connected to the positive terminal S1C of the first port S1 connected to the switch component 22, the normally open moving contact of the first switch element K1 (that is, the moving contact in the open position when the electromagnet M1 is not energized) is connected to the positive terminal S2C of the second port S2 connected to the switch component 22, the static contact of the second switch element K2 of the two switching elements is connected to the negative power supply terminal U0, the normally closed moving contact of the second switch element K2 is connected to the negative terminal S1N of the first port S1, and the normally open moving contact of the second switch element K2 is connected to the negative terminal S2N of the second port S2.

[0035] Taking the first port S1 as the port of the electrically operated circuit breaker 10 for connecting to the energy storage device and the second port S2 as the port of the electrically operated circuit breaker 10 for connecting to the power grid as an example, the power supply circuit 20 of the electrically operated circuit breaker 10 in the embodiment of the present application can enable the electric operating mechanism of the circuit breaker to operate normally regardless of whether it is in off-grid mode or grid-connected mode.

[0036] In the grid-connected mode, the power grid connected to the second port S2 is in normal working state, so the three positive terminals S2A, S2B, and S2C of the second port S2 are three-phase AC mains power, and the negative terminal S2N of the second port S2 is connected to the AC mains ground wire, so that the two ends of the electromagnet M1 in the intermediate relay KA1 are the electrical signals of one phase of the AC mains power, so that it performs a switching action that causes the first switching element K1 and the second switching element K2 to change from a state where the static contact is connected to the normally closed moving contact to a state where the static contact is connected to the normally open moving contact, thereby causing the connection between the positive power supply terminal U1 and the positive terminal S2x of the second port S2 and the connection between the negative power supply terminal U0 and the negative terminal S2N of the second port S2 to be conducted. In this way, the electrical signal of the single-phase AC mains power between the positive terminal S2C and the negative terminal S2N of the second port S2 is supplied as a power signal between the positive power supply terminal U1 and the negative power supply terminal U0 of the electric operating mechanism 11. This enables the electric operating mechanism 11 to generate its own required operating voltage through circuit components or control processes such as filtering and rectification, thereby achieving its function of controlling the on / off state of the switch mechanism 12 (i.e., controlling the opening and closing of the four-pole single-throw switch in the switch mechanism 12). It can be seen that in the grid-connected mode, whether the switch mechanism 12 is on or off, it does not affect the power supply of the power circuit 20 to the electric operating mechanism 11.

[0037] In the off-grid mode, the power grid to which the second port S2 is connected is in a power-off state, and thus there is no power supply voltage supplied to the three positive terminals S2A, S2B, and S2C and the negative terminal S2N of the second port S2. Consequently, there is no operating voltage across the electromagnet M1 in the intermediate relay KA1, so that it does not perform the above-mentioned switching action. The static contacts of the first switching element K1 and the second switching element K2 are both connected to their normally closed moving contacts, thereby causing the connection between the positive power supply terminal U1 and the positive terminal S1x of the first port S1, as well as the connection between the negative power supply terminal U0 and the negative terminal S1N of the first port S1, to be conducted. In this way, the local energy storage device, including a rechargeable battery or a rechargeable battery pack, can provide a DC or AC power supply voltage between the positive power supply terminal U1 and the negative power supply terminal U0 of the electric operating mechanism 11 through the first port S1 (between the positive terminal S1C and the negative terminal S1N). This allows the electric operating mechanism 11 to generate its own required operating voltage through circuit components or control processes such as filtering and rectification, thereby achieving its function of controlling the on / off state of the switch mechanism 12 (i.e., controlling the opening and closing of the four-pole single-throw switch in the switch mechanism 12). It can be seen that in off-grid mode, whether the switch mechanism 12 is on or off, it does not affect the power supply of the power circuit 20 to the electric operating mechanism 11.

[0038] Figure 3This is a schematic diagram of an application scenario of an electrically operated circuit breaker in a comparative example of this application. Figure 3 In this comparative example, the positive power supply terminal U1 of the electric operating mechanism 11 is directly connected to the positive terminal S2C of the second port S2, and the negative power supply terminal U0 of the electric operating mechanism 11 is directly connected to the negative terminal S2N of the second port S2. The aforementioned power supply circuit 20 is not provided. As such, the normal operation of the electric operating circuit breaker is completely dependent on the power supply from the second port S2 (e.g., the power grid). In grid-connected mode, where the power grid is operating normally, the electric operating mechanism 11 and the electric operating circuit breaker can obtain power and operate normally. However, in off-grid mode, where the power grid is outage, the electric operating mechanism 11 loses power and ceases to operate. This means that the electric operating mechanism 11 is unable to receive user commands or instructions, perform electric operations, change the conduction state of the switch mechanism 12, or notify the outside world of its cessation of operation.

[0039] After comparison, it is easy to see that Figure 2 In the circuit structure of the exemplary power supply circuit 20 shown, the electrically operated circuit breaker 10 or its electrically operated operating mechanism 11 can operate normally in both off-grid mode and grid-connected mode using only one intermediate relay KA1. That is, the problem of the electrically operated circuit breaker 10 failing or malfunctioning during a power outage can be solved by a very simple circuit structure modification, thereby helping to improve the stability and reliability of products such as circuit breakers, energy storage converters, and energy storage systems.

[0040] It should be noted that the power supply circuit 20 of the embodiment of the present application is provided in correspondence with the electrically operated circuit breaker, and thus can be packaged together with other components within the electrically operated circuit breaker 10 as a component of the electrically operated circuit breaker 10; in addition, the power supply circuit 20 can also be provided as an external accessory of the electrically operated circuit breaker 10 and matched with the electrically operated circuit breaker 10, or can be provided as an internal component or external accessory of the device connected to the first port S1 or the second port S2, and the embodiment of the present application does not impose any restrictions on this. It should be understood that examples of implementation methods of the electrically operated circuit breaker 10 including the power supply circuit 20 have been given above, and will not be repeated here.

[0041] Figure 4 This is a structural block diagram of an energy storage converter provided by an embodiment of the present application. Figure 4The energy storage converter includes the power supply circuit 20 of any of the above-mentioned electrically operated circuit breakers, and also includes a voltage converter 30 and a battery module 40. The battery module 40 may, for example, include at least one battery assembly consisting of rechargeable batteries, and a battery management system (BMS) device connected to each battery assembly. At least one output terminal of the battery module 40 is connected to the voltage converter 30, enabling the voltage converter 30 to process at least one of DC-AC conversion, DC-DC conversion, AC-DC conversion, and AC-AC conversion to meet the application requirements of the energy storage converter. At least one output terminal of the voltage converter 30 serves as the first port S1 (which may be omitted in some examples) capable of outputting electrical energy or charging the circuit breaker, and is connected to the power supply circuit 20. As part of the energy storage converter, the power supply circuit 20 is connected to a power port (including a positive power terminal U1 and a negative power terminal U0) for providing power to the external electrically operated circuit breaker 10, and is also connected to a second port S2 of the energy storage converter for connecting to grid equipment. In this way, the electrically operated circuit breaker 10 located outside the energy storage converter can be set between the first port S1 and the second port S2, and connected to the power circuit 20 to obtain power supply for the electrically operated mechanism 11, so as to realize the function of controlled connection or disconnection of the first port S1 and the second port S2.

[0042] by Figure 4 The energy storage converter shown is used as an example, and other variant implementations can also be obtained. For example, in one example, Figure 4 The power circuit 20 in the energy storage converter is replaced by an electrically operated circuit breaker 10 equipped with the power circuit 20. For another example, the energy storage converter does not include the battery module 40. The battery module 40 is connected to the voltage converter 30 in the energy storage converter as an external component of the energy storage converter.

[0043] It can be seen that since the above-mentioned energy storage converter includes any of the above-mentioned power supply circuits, when the second port is a grid port, the electrically operated circuit breaker can obtain power supply through the above-mentioned power supply circuit regardless of whether it is in off-grid mode or grid-connected mode. That is, the electric operating mechanism of the circuit breaker can work normally regardless of whether it is in off-grid mode or grid-connected mode, helping to improve the stability and reliability of products such as circuit breakers, energy storage converters and energy storage systems.

[0044] Figure 5 This is a structural block diagram of an energy storage system provided by an embodiment of the present application. Figure 5The energy storage system includes an energy storage converter 200 (any of the above-mentioned energy storage converters) and a battery module 100 connected to the energy storage converter 200. In one example, the battery module 100 is a battery array composed of rechargeable battery components according to application requirements, and multiple energy storage converters 200 that do not contain battery components are respectively configured at the output end of each independent battery array unit to be responsible for voltage conversion and other processing related to the corresponding battery array unit.

[0045] It can be seen that since the energy storage system includes the above-mentioned energy storage converter including any of the above-mentioned power supply circuits, when the second port is a grid port, the electrically operated circuit breaker can obtain power supply through the above-mentioned power supply circuit regardless of whether it is in off-grid mode or grid-connected mode. That is, the electric operating mechanism of the circuit breaker can operate normally regardless of whether it is in off-grid mode or grid-connected mode, helping to improve the stability and reliability of products such as circuit breakers, energy storage converters and energy storage systems.

[0046] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A power supply circuit for an electrically operated circuit breaker, characterized in that: The electrically operated circuit breaker has a positive power supply terminal, a negative power supply terminal, a first port, and a second port, so as to switch the on / off state between the first port and the second port based on the power supply voltage between the positive power supply terminal and the negative power supply terminal, wherein the first port and the second port each include a negative terminal and at least one positive terminal; the power supply circuit includes an action component and a switch component, wherein: Two ends of the action component are respectively connected to the negative terminal of the second port and a positive terminal of the second port, so as to perform a switching action when a power supply voltage is supplied to both ends; The switching component is respectively connected to the positive power supply terminal, the negative power supply terminal, the negative terminal of the first port, a positive terminal of the first port, the negative terminal of the second port, and a positive terminal of the second port, and the switching component is configured to: in response to the action component performing the switching action, conduct the connection between the positive power supply terminal and the positive terminal of the second port and the connection between the negative power supply terminal and the negative terminal of the second port; otherwise, conduct the connection between the positive power supply terminal and the positive terminal of the first port and the connection between the negative power supply terminal and the negative terminal of the first port.

2. The power supply circuit according to claim 1, wherein: The first port and the second port each include a negative terminal and three positive terminals, and the action component and the switch component are connected to the same positive terminal of the second port.

3. The power supply circuit according to claim 1, wherein: The first port is a port of the electrically operated circuit breaker for connecting to an electricity storage device, and the second port is a port of the electrically operated circuit breaker for connecting to a power grid.

4. The power supply circuit according to any one of claims 1 to 3, characterized in that: The action component and the switch component are respectively realized by an electromagnet of the same intermediate relay and two switch elements.

5. The power supply circuit according to claim 4, wherein: The two ends of the electromagnet are respectively connected to the negative terminal and the positive terminal of the second port, the static contact of the first switching element of the two switching elements is connected to the positive power supply end, the normally closed moving contact of the first switching element is connected to the positive terminal of the first port connected to the switching component, and the normally open moving contact of the first switching element is connected to the positive terminal of the second port connected to the switching component. The static contact of the second switching element of the two switching elements is connected to the negative power supply end, the normally closed moving contact of the second switching element is connected to the negative terminal of the first port, and the normally open moving contact of the second switching element is connected to the negative terminal of the second port.

6. An electrically operated circuit breaker, characterized in that: The electrically operated circuit breaker is the electrically operated circuit breaker as claimed in any one of claims 1 to 5, and includes the power supply circuit as claimed in any one of claims 1 to 5.

7. The electrically operated circuit breaker according to claim 6, characterized in that The electrically operated circuit breaker includes an electrically operated mechanism and a switching mechanism, wherein the switching mechanism is connected between the first port and the second port, and the electrically operated mechanism is connected to the switching mechanism and a positive power supply terminal and a negative power supply terminal of the electrically operated circuit breaker, respectively. The electrically operated mechanism is configured to control the on / off state of the switching mechanism based on a power supply voltage between the positive power supply terminal and the negative power supply terminal.

8. The electrically operated circuit breaker according to claim 7, characterized in that The first port and the second port each include a negative terminal and three positive terminals, and the switch mechanism includes a four-pole single-throw switch connected between the first port and the second port.

9. An energy storage converter, characterized in that: The energy storage converter comprises: the power supply circuit according to any one of claims 1 to 5, and / or the electrically operated circuit breaker according to any one of claims 6 to 8.

10. An energy storage system, characterized in that: The energy storage system includes the energy storage converter according to claim 9.

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