A magnetic latching relay board

Abstract

The application provides a magnetic latching relay board, which is a relay board composed of three groups of relay circuits, N-line electrodes and wiring terminals; for any group of relay circuits, the relay circuit comprises: a power grid input branch and a power grid output branch; the power grid input branch comprises a first input electrode, an input fuse, an input relay, a current sensor and a second input electrode connected in sequence; a filter device is arranged between the second input electrode and the N-line electrode; the relay board is composed of three groups of relay circuits, N-line electrodes and wiring terminals, each group containing an input and an output branch, is suitable for single-phase 220V and three-phase 400V voltage, can be connected with a power grid and a power conversion device, realizes filtering, current detection and short-circuit protection, and has compact layout, strong adaptability and low safety consumption.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a magnetic latching relay board. Background Technology

[0002] During power system operation, grid voltage is susceptible to fluctuations in load and line losses, leading to substandard conditions such as low or high voltage. This severely impacts the normal operation of downstream equipment and can even shorten its lifespan. Currently, voltage regulation devices mostly employ an AC-DC-AC regulation method. This method is complex in structure and loosely configured, resulting in high standby power loss and slow response speed. Furthermore, it is difficult to simultaneously adapt to the needs of equipment operating at both three-phase 400V and single-phase 220V AC voltage levels. In addition, the input and output connection structures of existing voltage regulation devices lack reliable short-circuit protection and harmonic filtering mechanisms, resulting in insufficient power transmission stability and an inability to adequately guarantee power quality. Utility Model Content

[0003] The purpose of this application is to provide a magnetic latching relay board that solves the above-mentioned problems existing in the prior art. It can solve the problems of traditional voltage regulating devices having complex structure, poor adaptability, large standby power loss, lack of reliable protection and filtering mechanism, and difficulty in simultaneously addressing three-phase and single-phase voltage regulation and power quality assurance.

[0004] In a first aspect, this application provides a magnetic latching relay board, which is a relay board composed of three sets of relay circuits, an N-line electrode, and a ribbon cable terminal; For any given set of relay circuits, the relay circuit includes: a power grid input branch and a power grid output branch; The power grid input branch includes a first input electrode, an input fuse, an input relay, a current sensor, and a second input electrode connected in sequence; a filter device is provided between the second input electrode and the N-line electrode; the first input electrode is also connected to the power grid input terminal; The power grid output branch includes a first output electrode, an output fuse, an output relay, and a second output electrode connected in sequence; the first output electrode is also connected to the power grid output terminal. The control terminals of the input relay and the output relay are respectively connected to the ribbon cable terminal; the output terminal of the current sensor is connected to the ribbon cable terminal. The second input electrode and the second output electrode are also connected to an external inductor; The N-line electrode is connected to the N-line of the power grid; The ribbon cable terminals are connected to an externally configured power conversion device.

[0005] In one possible implementation, the current sensor is a Hall sensor or a current transformer.

[0006] In one possible implementation, the input relay and the output relay are magnetic latching relays.

[0007] In one possible implementation, the voltage adaptation range of the power grid input terminal and the power grid output terminal includes single-phase 220V AC voltage and three-phase 400V AC voltage.

[0008] In one possible implementation, the filtering device includes a capacitor and an inductor; One end of the inductor is connected to the second input electrode, and the other end is connected to one end of the capacitor, while the other end of the capacitor is connected to the N-line electrode.

[0009] In one possible implementation, three sets of relay circuits are arranged in parallel within the body of the magnetic latching relay plate.

[0010] In one possible implementation, the first input electrode, the first output electrode, the second input electrode, and the second output electrode are all metal electrodes for crimping or soldering to external circuitry and are fixed to the edge of the magnetic latching relay plate.

[0011] In one possible implementation, the ribbon cable terminal is a strip-shaped multi-pin connector fixed to one side of the magnetic latching relay board, used to achieve signal connection with an external power conversion device via the ribbon cable.

[0012] This application provides a magnetic latching relay board, which is a relay board composed of three sets of relay circuits, a neutral (N) electrode, and a ribbon cable terminal. For any one set of relay circuits, the relay circuit includes: a power grid input branch and a power grid output branch; the power grid input branch includes a first input electrode, an input fuse, an input relay, a current sensor, and a second input electrode connected in sequence; a filter device is provided between the second input electrode and the neutral (N) electrode; the first input electrode is also connected to the power grid input terminal; the power grid output branch includes a first output electrode, an output fuse, an output relay, and a second output electrode connected in sequence; the first output electrode is also connected to the power grid output terminal; the control terminals of the input relay and the output relay are respectively connected to the ribbon cable terminal; the output terminal of the current sensor is connected to the ribbon cable terminal; the second input electrode and the second output electrode are also connected to an external inductor; the neutral (N) electrode is connected to the power grid neutral (N) line; and the ribbon cable terminal is connected to an externally configured power conversion device. The relay board consists of three sets of relay circuits, N-line electrodes, and ribbon cable terminals. Each set includes input and output branches, and is compatible with single-phase 220V and three-phase 400V voltages. It can be connected to the power grid and power conversion devices to achieve filtering, current detection, and short-circuit protection. It features a compact layout, strong adaptability, safety, and low power consumption. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A layout diagram of a magnetic latching relay board provided in an embodiment of this application; Figure 2 This is a structural diagram illustrating the control principle of a magnetic latching relay board provided in an embodiment of this application. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0016] During power system operation, grid voltage is susceptible to fluctuations in load and line losses, leading to substandard conditions such as low or high voltage. This severely impacts the normal operation of downstream equipment and can even shorten its lifespan. Currently, voltage regulation devices mostly employ an AC-DC-AC regulation method. This method is complex in structure and loosely configured, resulting in high standby power loss and slow response speed. Furthermore, it is difficult to simultaneously adapt to the needs of equipment operating at both three-phase 400V and single-phase 220V AC voltage levels. In addition, the input and output connection structures of existing voltage regulation devices lack reliable short-circuit protection and harmonic filtering mechanisms, resulting in insufficient power transmission stability and an inability to adequately guarantee power quality.

[0017] Therefore, this application provides a magnetic latching relay board to solve the above-mentioned problems existing in the prior art. It can solve the problems of traditional voltage regulating devices having complex structure, poor adaptability, large standby loss, lack of reliable protection and filtering mechanism, and difficulty in taking into account both three-phase and single-phase voltage regulation and power quality assurance.

[0018] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0019] The figure shows a layout diagram of a magnetic latching relay board provided in this application, combined with... Figure 1As shown, the magnetic latching relay board consists of three sets of relay circuits, an N-line electrode, and a ribbon cable terminal. This relay board, as a core component of the AC-AC electronic voltage regulator, consists of an N-line electrode, ribbon cable terminals, and three sets of relay circuits with identical structure and function. Each set of relay circuits corresponds to phases A, B, and C of the power grid, respectively. The three work together to achieve power connection and signal transmission between the power grid input / output and the power conversion device. It is compatible with both three-phase AC voltage levels (400V) and single-phase AC voltage levels (220V), and any one of the three phase relay circuits can be used independently as a single-phase relay device. The following details the overall structure and the connection relationships of each component: The wiring methods, component configurations, and functions of the three relay circuits (phase A, phase B, and phase C) are completely identical, each including a power grid input branch and a power grid output branch.

[0020] For any given set of relay circuits, the relay circuit includes: a power grid input branch and a power grid output branch; A. The power grid input branch includes a first input electrode, an input fuse, an input relay, a current sensor, and a second input electrode connected in sequence; a filter device is provided between the second input electrode and the neutral (N) line electrode; the first input electrode is also connected to the power grid input terminal; Specifically, the first input electrode is connected to the power grid input terminal and one end of the input fuse, the other end of the input fuse is connected to one end of the input relay, the other end of the input relay is connected to one end of the current sensor, the other end of the current sensor is connected to the second input electrode, the second input electrode is also connected to one end of the filter device, and the other end of the filter device is connected to the N-line electrode. B. The power grid output branch includes a first output electrode, an output fuse, an output relay, and a second output electrode connected in sequence; the first output electrode is also connected to the power grid output terminal. Specifically, the first output electrode is connected to the power grid output terminal and one end of the output fuse, the other end of the output fuse is connected to one end of the output relay, the other end of the output relay is connected to the second output electrode, and the second output electrode is also coupled to an external inductor, so as to realize the transmission of electrical energy from the power conversion device through the external filter inductor and the magnetic latching relay board to the power grid output terminal.

[0021] Furthermore, the control terminals of the input relay and the output relay are connected to the ribbon cable terminals respectively; the output terminal of the current sensor is connected to the ribbon cable terminals. Specifically, the control terminal of the input relay is directly connected to the ribbon cable terminal, and the control terminal of the output relay is also connected to the corresponding ribbon cable terminal. This connection method establishes a control signal transmission channel between the input and output relays and the externally configured power conversion device through the ribbon cable terminal. This allows the power conversion device to send on / off control commands to the input and output relays. When the mains voltage does not meet the demand, the input and output relays are closed to conduct the power transmission path; when the mains voltage is normal or a short circuit occurs at the downstream end, the input and output relays are opened to reduce standby power consumption or protect the equipment.

[0022] The output of the current sensor is connected to a ribbon cable terminal. This connection transmits the magnitude and direction signals of the grid input branch current detected by the current sensor to an externally configured power conversion device in real time. After receiving this signal, the power conversion device can adjust the PWM current control loop in real time, thereby ensuring the fast response and stability of the output voltage and providing support for voltage modulation accuracy.

[0023] The second input electrode and the second output electrode are also connected to an external inductor; Specifically, the second input electrode is connected to an external inductor. This connection is a crucial link in the transmission of power from the grid to the power conversion device. The power input from the grid is transmitted to the second input electrode via the first input electrode, input fuse, input relay, and current sensor. After passing through the connection between the second input electrode and the external inductor, it is smoothly delivered to the power conversion device for voltage modulation. Similarly, the second output electrode is connected to an external inductor. The target voltage modulated by the power conversion device is first filtered by the external inductor and then input to the output branch of the relay board via the second output electrode to ensure the stability of the output power.

[0024] The N-line electrode is connected to the N-line of the power grid; Specifically, the N-line electrode is directly connected to the N-line of the power grid. Since the secondary side of the transformer in a certain area's power grid system adopts a three-phase four-wire connection, this connection provides a stable neutral line circuit for the relay board. In particular, it provides a working circuit for the filter device between the second input electrode and the N-line electrode, ensuring that the filter device can effectively filter out high-order harmonics from the power grid input and avoid harmonics from interfering with power quality and system stability.

[0025] The ribbon cable terminals are connected to an externally configured power conversion device.

[0026] Specifically, the ribbon cable terminals are connected to the externally configured power conversion device. This connection establishes an integrated signal transmission and control loop between the relay board and the power conversion device. On the one hand, it enables bidirectional transmission of control signals (on / off commands from the power conversion device to the input and output relays). On the other hand, it completes the transmission of detection signals (current detection signals from the current sensor) to the power conversion device. At the same time, it ensures the coordinated operation between the relay board and the power conversion device, enabling the relay board to fully play its role as a bridge connecting the power grid input, output and power conversion device, and ensuring the stable operation of the entire AC-AC electronic voltage regulator.

[0027] Combination Figure 1 As shown, a detailed explanation is given using the A-phase relay circuit as an example: The first input electrode serves as the access terminal for the A-phase power grid input. It is directly connected to the A-phase power grid input terminal and is also fixedly connected to one end of the input fuse, thereby enabling the introduction of power grid energy into the relay board. The other end of the input fuse is connected to one end of the input relay. As a core short-circuit protection device, the input fuse can quickly disconnect the connection between the power grid and the power conversion device when the downstream load is short-circuited, so that the equipment can switch to bypass working mode and achieve self-protection. The other end of the input relay is connected to one end of the current sensor. The input relay is the core control component of the branch. Its on / off state is regulated by external control commands and is used to realize the connection and disconnection of the power grid input circuit. The other end of the current sensor is connected to the second input electrode. The current sensor is used to detect the magnitude and direction of the current in the input branch in real time, providing data support for the subsequent closed-loop control of voltage modulation. The second input electrode is also coupled to an external inductor, and is also connected to one end of a filter device. The other end of the filter device is fixedly connected to the N-line electrode, forming a complete filter circuit to filter out high-order harmonics from the grid input and prevent harmonics from interfering with power quality and system stability.

[0028] The first output electrode serves as the input terminal for the A-phase power grid output and is fixedly connected to one end of the output fuse to realize the introduction of modulated electrical energy into the relay board. The other end of the output fuse is connected to one end of the output relay. The output fuse also serves as a short circuit protection device, which can quickly disconnect the circuit when a short circuit fault occurs on the output side, protecting the power conversion device and downstream electrical equipment. The other end of the output relay is connected to the second output electrode. The on / off state of the output relay is controlled in coordination with the input relay to ensure the orderly transmission of electrical energy. The second output electrode is also coupled to an external inductor. The target voltage, after being filtered by the external inductor, is transmitted to the grid output terminal through the second output electrode and finally fed back to the user's grid, providing stable and qualified power to the downstream users.

[0029] In some embodiments, the current sensor is a Hall sensor or a current transformer. Specifically, one current sensor is fixedly installed in each power grid input branch, with one end connected to the input relay and the other end connected to the second input electrode. This configuration ensures that the current sensor can accurately capture the magnitude and direction of the current in the input branch, and transmit it to the external power conversion device through the ribbon cable terminal. This provides reliable data support for the real-time adjustment of the PWM current control loop, directly ensuring the fast response and operational stability of the output voltage, and adapting to the voltage modulation requirements of the AC-AC electronic voltage regulator.

[0030] Both the input and output relays are magnetically latched relays. Specifically, one input relay is installed for each power grid input branch, and one output relay is installed for each power grid output branch. As the core control component for branch switching, the magnetically latched relay receives control commands from the external power conversion device through the cable terminal, enabling precise connection and disconnection of the power grid input and output circuits. When the power grid voltage does not meet the demand, the magnetically latched relay is closed, connecting the power transmission path. When the power grid voltage is normal or a short circuit occurs at the downstream end, the magnetically latched relay is opened, effectively reducing standby power consumption and protecting equipment and electrical loads, fully utilizing the low power consumption and reliable control characteristics of the magnetically latched relay.

[0031] The voltage adaptation range of the power grid input and output terminals includes single-phase 220V AC voltage and three-phase 400V AC voltage. This adaptation function is achieved through the structural design of three sets of relay circuits: the three sets of relay circuits correspond to phases A, B, and C respectively, and when working together, they can meet the usage requirements of equipment with a three-phase 400V AC voltage level; when only single-phase 220V AC voltage adaptation is required, any one of the three sets of relay circuits can be activated individually, and that set of relay circuits can operate independently as a single-phase relay device without additional modification, demonstrating extremely strong adaptability.

[0032] The filtering components include capacitors and inductors; specifically, one end of the inductor is connected to the second input electrode, and the other end is connected to one end of the capacitor, while the other end of the capacitor is connected to the neutral (N) line electrode. This configuration can specifically filter out high-order harmonics from the mains input, avoiding interference with power quality and reducing the impact of high-frequency harmonics on system stability, thus ensuring the purity of the power input to the power conversion device.

[0033] In some embodiments, the relay board layout structure and mounting characteristics of this application may specifically include: Three sets of relay circuits are arranged in parallel on the magnetic latching relay board. The component configuration and wiring method of each set of circuits are completely identical, and the circuits maintain a reasonable distance from each other. This ensures that each circuit operates independently without interference, while also making the overall board layout compact and simple, making full use of the board space, and meeting the installation requirements of AC-AC electronic voltage regulators for miniaturization and integration of core components.

[0034] The power grid output branch and input branch are arranged in parallel and symmetrical layout on the board. This symmetrical layout facilitates the connection of external lines (power grid output end, external inductor) and makes the lines on the board run in a regular manner, avoiding cross-interference between input and output branches, ensuring the stability of power transmission, and reducing assembly difficulty.

[0035] The first input electrode, first output electrode, second input electrode, and second output electrode are all metal electrodes used for crimping or soldering with external circuits. Their structure is adapted to the connection requirements of external circuits and they are fixed to the edge of the magnetic latching relay board. This installation position design facilitates the access and wiring of external circuits while avoiding interference between the electrode connection points and other components on the board, thus improving the convenience and reliability of connection operations.

[0036] The ribbon cable terminal is a single-pin connector fixed to one side of the magnetic latching relay board. It is used to connect to an external power conversion device via a ribbon cable. The number of pins on the ribbon cable terminal corresponds one-to-one with the number of input relay control terminals, output relay control terminals, and current sensor output terminals. This ribbon cable establishes a control signal transmission channel (on / off commands from the power conversion device to the input / output relays) and a detection signal transmission channel (current detection signals from the current sensor to the power conversion device) between the relay board and the power conversion device, ensuring their coordinated operation.

[0037] The neutral (N) electrode is located at the edge of the magnetic latching relay board and shares the same connection point with the filter components connected to the second input electrode in each of the three relay circuits. This means its terminals are easily connected to the N-line cable of the power grid, forming a stable neutral circuit. Specifically, the end of the capacitor in each circuit that is furthest from the inductor is fixedly connected to the same connection point on the N-line electrode, ensuring that all three circuits can form a complete path using the N-line electrode, fully utilizing harmonic filtering capabilities and guaranteeing consistent input power quality across all phases.

[0038] Combination Figure 2 As shown, the control principle of this relay board revolves around the design of the power transmission control and signal interaction control loop. Through the coordinated cooperation of various components, it achieves efficient connection and stable regulation of the power grid input, output and power conversion device, and is fully compatible with the voltage management requirements of AC-AC electronic voltage regulators. Its specific structure and working logic are as follows: A. Power transmission circuit: It consists of three sets of parallel relay circuits (A phase, B phase, C phase) and N line electrode. Each set of circuits includes a grid input branch and a grid output branch, which are responsible for realizing bidirectional power transmission between the grid side and the power conversion device. The control logic of the power transmission circuit specifically includes: power transmission on the grid input side is achieved through the following path: grid input terminal (grid input side Uin), first input electrode, input fuse, input relay, current sensor (input current acquisition device), second input electrode, external inductor, and power conversion device. Its control logic relies on the on / off state regulation of the input relay. When the grid voltage does not meet the demand (too low or too high), the CPU of the external power conversion device sends a closing command to the input relay through the ribbon cable terminal. The input relay is turned on, and the grid power is smoothly input to the power conversion device through the above path, providing an energy source for voltage modulation. During power transmission, the current sensor detects the magnitude and direction of the branch current in real time and feeds the detection signal back to the CPU through the ribbon cable terminal. The CPU adjusts the PWM current control loop in real time based on the signal to ensure the stability of the input current and lay the foundation for the subsequent voltage modulation accuracy. Meanwhile, the filtering components (capacitors and inductors) between the second input electrode and the N-line electrode form an RC filter circuit, which filters out high-order harmonics from the grid input in real time, avoids harmonic interference with the modulation logic of the power conversion device, and ensures the quality of the input power.

[0039] The power transmission on the grid output side is achieved through the path of power conversion device, external inductor, second output electrode, output relay, output fuse, first output electrode, and grid output terminal (grid output side Uout). Its control logic is coordinated with the input side. After the power conversion device modulates the voltage according to the preset target value, it generates a stable target voltage. At this time, the CPU sends a closing command to the output relay through the ribbon cable terminal. The output relay is turned on, and the modulated electrical energy is fed back to the grid output terminal through the above path to provide qualified electrical energy to the downstream users. The output fuse and the input fuse form a bidirectional protection. If a short circuit fault occurs on the output side, the output fuse will quickly disconnect to prevent the fault from spreading to the power conversion device and the input power grid, thus ensuring the safe operation of the entire voltage regulation system. The power transmission direction of the output branch is opposite to that of the input branch, but it maintains a parallel layout with the corresponding input branch, so that the power transmission path is regular, the line cross-interference is reduced, and the transmission efficiency is guaranteed.

[0040] B. Signal control circuit: It consists of ribbon cable terminals, input relay control terminals, output relay control terminals and current sensor output terminals. It is responsible for establishing the control command and detection signal transmission channel between the relay board and the external power conversion device (including CPU), providing support for the precise regulation of power transmission.

[0041] The interaction logic of the signal control loop includes: the external CPU sends on / off control commands to the control terminals of the input and output relays through the ribbon cable terminals. The commands are transmitted in phase sequence (phase A command corresponds to phase A relay, phase B command corresponds to phase B relay, and phase C command corresponds to phase C relay), ensuring independent control or coordinated operation of the three sets of loops; the current sensor feeds back the detected input branch current signal to the CPU in real time through the ribbon cable terminals. The CPU combines this signal with the grid voltage detection signal to dynamically adjust the PWM control strategy, achieving rapid response and precise stability of the output voltage; the pin layout of the ribbon cable terminals is strictly matched with the signal type, and the control command pins and detection signal pins are arranged in separate areas to avoid signal interference, ensure the accuracy of command transmission and the timeliness of signal feedback, and provide a guarantee for the coordinated operation of the two loops.

[0042] When adapting to three-phase 400V voltage, the CPU sends synchronous control commands to the input and output relays of three sets of relay circuits simultaneously through the ribbon cable terminals. The three sets of circuits are turned on in tandem, and electrical energy is transmitted synchronously through the three-phase circuits to meet the power requirements of three-phase equipment. When adapting to single-phase 220V voltage, the CPU only sends control commands to any one phase of the three circuits (the input relays and output relays of the other two phases remain open). The relay circuit of that phase is independently turned on, forming a complete single-phase power transmission circuit. No modification to the schematic structure is required, making it highly adaptable.

[0043] This application provides a magnetic latching relay board, which is a relay board composed of three sets of relay circuits, a neutral (N) electrode, and a ribbon cable terminal. For any one set of relay circuits, the relay circuit includes: a power grid input branch and a power grid output branch; the power grid input branch includes a first input electrode, an input fuse, an input relay, a current sensor, and a second input electrode connected in sequence; a filter device is provided between the second input electrode and the neutral (N) electrode; the first input electrode is also connected to the power grid input terminal; the power grid output branch includes a first output electrode, an output fuse, an output relay, and a second output electrode connected in sequence; the first output electrode is also connected to the power grid output terminal; the control terminals of the input relay and the output relay are respectively connected to the ribbon cable terminal; the output terminal of the current sensor is connected to the ribbon cable terminal; the second input electrode and the second output electrode are also connected to an external inductor; the neutral (N) electrode is connected to the power grid neutral (N) line; and the ribbon cable terminal is connected to an externally configured power conversion device. The relay board consists of three sets of relay circuits, N-line electrodes, and ribbon cable terminals. Each set includes input and output branches, and is compatible with single-phase 220V and three-phase 400V voltages. It can be connected to the power grid and power conversion devices to achieve filtering, current detection, and short-circuit protection. It features a compact layout, strong adaptability, safety, and low power consumption.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] Although preferred embodiments have been described in this application, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0048] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations to the embodiments of this application fall within the scope of the claims in this application and their equivalents, then this application also intends to include these modifications and variations.

Claims

1. A magnetic latching relay board, characterized in that, The magnetic latching relay board is a relay board consisting of three sets of relay circuits, an N-line electrode, and a ribbon cable terminal. For any given set of relay circuits, the relay circuit includes: a power grid input branch and a power grid output branch; The power grid input branch includes a first input electrode, an input fuse, an input relay, a current sensor, and a second input electrode connected in sequence; a filter device is provided between the second input electrode and the N-line electrode; the first input electrode is also connected to the power grid input terminal; The power grid output branch includes a first output electrode, an output fuse, an output relay, and a second output electrode connected in sequence; the first output electrode is also connected to the power grid output terminal. The control terminals of the input relay and the output relay are respectively connected to the ribbon cable terminal; the output terminal of the current sensor is connected to the ribbon cable terminal. The second input electrode and the second output electrode are also connected to an external inductor; The N-line electrode is connected to the N-line of the power grid; The ribbon cable terminals are connected to an externally configured power conversion device.

2. The magnetic latching relay board as described in claim 1, characterized in that, The current sensor is a Hall sensor or a current transformer.

3. The magnetic latching relay board as described in claim 1, characterized in that, The input relay and the output relay are magnetic latching relays.

4. The magnetic latching relay board as described in claim 1, characterized in that, The voltage adaptation range of the power grid input terminal and the power grid output terminal includes single-phase 220V AC voltage and three-phase 400V AC voltage.

5. The magnetic latching relay board as described in claim 1, characterized in that, The filtering components include capacitors and inductors; One end of the inductor is connected to the second input electrode, and the other end is connected to one end of the capacitor, while the other end of the capacitor is connected to the N-line electrode.

6. The magnetic latching relay board as described in claim 1, characterized in that, The three sets of relay circuits are arranged in parallel on the magnetic latching relay board.

7. The magnetic latching relay board as described in claim 1, characterized in that, The first input electrode, the first output electrode, the second input electrode, and the second output electrode are all metal electrodes used for crimping or welding with external circuits, and are fixed to the edge of the magnetic latching relay plate.

8. The magnetic latching relay board as described in claim 1, characterized in that, The ribbon cable terminal is a strip-shaped multi-pin connector, fixed to one side of the magnetic latching relay board, and used to connect to an external power conversion device via a ribbon cable.

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