A switch module and a power transmission device

Abstract

The present disclosure provides a switch module and a power transmission device, which are applied to the field of smart grid technology, wherein the switch module includes: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit; the first switch circuit is configured to turn on or off the first switch circuit according to an instruction received from a first control terminal, the first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit, the first pre-charging circuit is configured to limit the current at the moment the first absorption circuit is connected, and to pre-charge the first absorption circuit; the first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switch circuit are working, the first rectifying unit is configured to rectify the current generated during the switching process of the switch unit, the first discharge circuit is electrically connected to the first switch circuit through the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of smart grids, and in particular to a switch module and a power transmission device. Background Art

[0002] AC electronic switches, also known as solid-state electronic switches, can control the on and off of AC current. In applications, thyristors are often used in parallel. AC electronic switches can be easily controlled by weak current signals, such as MCU, and are very convenient for use in a variety of occasions and have good application prospects. However, AC electronic switches in related technologies have technical problems such as complex circuit structure, high cost, low reliability, and slow response speed. Summary of the invention

[0003] The present disclosure provides a switch module and a power transmission device, aiming to solve at least one of the above technical problems. The switch module of the present disclosure simplifies the circuit structure and achieves a higher response speed, further achieving the purpose of reducing the manufacturing cost of the AC electronic switch.

[0004] A first aspect of the present disclosure provides a switch module, comprising: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit;

[0005] The first switch circuit is configured to turn on or off the first switch circuit according to the instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the first switch circuit;

[0006] The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first absorption circuit is connected and to pre-charge the first absorption circuit. The first pre-charging circuit includes: a first pre-charging resistor and a first switch, and the first pre-charging resistor and the first switch are connected in parallel.

[0007] The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least three groups of diodes connected in series in pairs; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shut-down process, and the first absorption unit includes at least one capacitor;

[0008] The first discharge circuit is electrically connected to the first switch circuit via the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit;

[0009] The switch module is controlled by a first control terminal, the first control terminal is connected to the switch module, and the first control terminal is configured to control the switch module according to a received command from a host computer.

[0010] Optionally, the first switch circuit includes at least a first switch unit and a second switch unit;

[0011] The first switch unit at least includes a first semiconductor switch device and a first diode, the drain and source of the first semiconductor switch device are respectively connected to the grid input terminal and the anode of the first diode, and the cathode of the first diode is connected to the load;

[0012] The second switch unit at least includes a second semiconductor switch device and a second diode, wherein a source and a drain of the second semiconductor switch device are respectively connected to a grid input terminal and a cathode of the second diode, and an anode of the second diode is connected to a load.

[0013] Optionally, the semiconductor switching device is a reverse conducting power semiconductor device.

[0014] Optionally, in the first absorption circuit, the first rectifying unit is connected in series with the first absorption unit;

[0015] In the first rectifying unit, the diodes are connected in series in pairs, and the diodes in each group are connected in forward direction in series; the groups of diodes connected in series in pairs are connected in parallel, and are also connected in parallel with the capacitor.

[0016] Optionally, in the first absorption circuit:

[0017] The input end and the output end of the first switch circuit are electrically connected to the midpoints of the groups of diodes connected in series of the first rectifying unit respectively;

[0018] The first rectifier unit is electrically connected to the neutral line of the power grid.

[0019] Optionally, the first discharge circuit includes:

[0020] At least one discharge resistor,

[0021] A semiconductor switch tube or a mechanical switch is connected in series with a discharge resistor;

[0022] Wherein, one end of the first discharge circuit is connected to the ground wire.

[0023] Optionally, the switch module further includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a third switch circuit, a third absorption circuit and a third pre-charging circuit;

[0024] The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0025] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch. The second pre-charging resistor is connected in parallel with the second switch.

[0026] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the second switch circuit, and the second absorption unit includes at least one capacitor;

[0027] The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0028] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected and to pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch.

[0029] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the third switch circuit during the shutdown process, and the third absorption unit includes at least one capacitor;

[0030] One end of the second absorption circuit is connected to the grid neutral line through the fifth node and the first node, and one end of the third absorption circuit is connected to the grid neutral line through the sixth node and the first node;

[0031] The other end of the second absorption circuit is electrically connected to the third node and the fourth node of the first discharge circuit through the second node and the seventh node, and the other end of the third absorption circuit is electrically connected to the third node and the fourth node of the first discharge circuit through the ninth node and the eighth node.

[0032] Optionally, the switch module further includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a second discharge circuit, a third switch circuit, a third absorption circuit, a third pre-charging circuit and a third discharge circuit;

[0033] The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0034] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch. The second pre-charging resistor is connected in parallel with the second switch.

[0035] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the second switch circuit, and the second absorption unit includes at least one capacitor;

[0036] The second discharge circuit is electrically connected to the second switch circuit via the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit;

[0037] The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0038] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected and to pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch.

[0039] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the third switch circuit during the shutdown process, and the third absorption unit includes at least one capacitor;

[0040] The third discharge circuit is electrically connected to the third switch circuit via the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the second absorption circuit;

[0041] The second absorption circuit is connected to the neutral line of the power grid via the fifth node and the first node, and the third absorption circuit is connected to the neutral line of the power grid via the sixth node and the first node.

[0042] A second aspect of the present disclosure provides another switch module, comprising: a first switch module, a second switch module and a third switch module;

[0043] The first switch module includes: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit; the first switch circuit is configured to turn on or off the first switch circuit according to the instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions; the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; at least two switch units are connected in reverse parallel to form the first switch circuit;

[0044] The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first switch module is connected and pre-charge the first absorption circuit. The first pre-charging circuit includes: a first pre-charging resistor and a first switch, and the first pre-charging resistor is connected in parallel with the first switch.

[0045] The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least two groups of diodes connected in series; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shut-down process, and the first absorption unit includes at least one capacitor;

[0046] The first discharge circuit is electrically connected to the first switch circuit via the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit;

[0047] The first switch module is controlled by a first control terminal, the first control terminal is connected to the first switch module, and the first control terminal is configured to control the first switch module according to a received command from a host computer;

[0048] The second switch module includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit and a second discharge circuit; the second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0049] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second switch module is connected and pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch, and the second pre-charging resistor is connected in parallel with the second switch.

[0050] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least two groups of diodes connected in series; the second absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the second switch circuit, and the second absorption unit includes at least one capacitor;

[0051] The second discharge circuit is electrically connected to the second switch circuit via the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit;

[0052] The second switch module is controlled by a second control terminal, the second control terminal is connected to the second switch module, and the second control terminal is configured to control the second switch module according to a received command from the host computer;

[0053] The third switch module includes: a third switch circuit, a third absorption circuit, a third pre-charging circuit and a third discharge circuit; the third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0054] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third switch module is connected and pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch.

[0055] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least two groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the third switch circuit, and the third absorption unit includes at least one capacitor;

[0056] The third discharge circuit is electrically connected to the third switch circuit via the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the third absorption circuit;

[0057] The third switch module is controlled by a third control terminal, the third control terminal is connected to the third switch module, and the third control terminal is configured to control the third switch module according to a received command from the host computer;

[0058] When the first discharge circuit, the second discharge circuit and the third discharge circuit are the same discharge circuit, the second switch module connects the discharge circuit with the third node and the fourth node of the first switch module through the second node and the seventh node; the second switch module and the third switch module both share the discharge circuit with the first switch module through the third node and the fourth node.

[0059] A third aspect of the present disclosure provides a power transmission device using the switch module of any one of the first aspect or the second aspect, the power transmission device comprising:

[0060] At least two switch modules are provided in two power transmission lines and are communicatively connected with the power grid.

[0061] The switch module provided by the present invention adopts an innovative topological circuit structure to achieve millisecond-level rapid response switching, and uses standardized power devices to lower the overall cost of the switch module, saving manufacturing costs; using the switch module disclosed in the present invention can reduce the energy loss in the switching process in the circuit, and the energy consumption of the switch module itself is lower.

[0062] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0064] Figure 1 The invention is an existing AC electronic switch circuit diagram using thyristors;

[0065] Figure 2 It is an existing AC electronic switch circuit diagram;

[0066] Figure 3 It is another existing AC electronic switch circuit diagram;

[0067] Figure 4 A principle block diagram of a switch module according to an embodiment of the present disclosure is shown;

[0068] Figure 5A principle block diagram of a switch module according to another embodiment of the present disclosure is shown;

[0069] Figure 6 A circuit diagram of a switch module according to an embodiment of the present disclosure is shown;

[0070] Figure 7 A circuit schematic diagram indicating symbols of components in a switch module according to an embodiment of the present disclosure is shown;

[0071] Figure 8 A circuit diagram of a switch module according to another embodiment of the present disclosure is shown;

[0072] Fig. 9 A schematic diagram showing a three-phase four-wire circuit using a switch module sharing a first discharge circuit according to an embodiment of the present disclosure is shown;

[0073] Fig.10 A schematic diagram showing a three-phase four-wire circuit using a switch module according to an embodiment of the present disclosure that does not share a first discharge circuit;

[0074] Fig.11 A schematic diagram showing a three-phase three-wire circuit sharing a first discharge circuit using a switch module according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0076] In addition, the term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0077] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together directly or through one or more intermediate components.

[0078] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", "top", "bottom", etc. may be used here to describe the spatial positional relationship between a device or element and other devices or elements as shown in the figure. For example, the terms "on...", "above...", "above...", "on the upper surface of...", "above", "positioned on..." or "positioned on top of..." etc. mean that a first element such as a first structure exists on a second element such as a second structure, wherein there may or may not be an intermediate element between the first element and the second element. The term "contact" means connecting a first element such as a first structure and a second element such as a second structure, and there may or may not be other elements at the interface of the two elements. It should be understood that spatially relative terms are intended to include different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures" afterwards. Thus, the exemplary term "above..." may include both "above..." and "below..." orientations. The device may be otherwise oriented, rotated 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

[0079] AC electronic switch is also called solid-state electronic switch, which can control the on and off of AC current. In applications, thyristors are often connected in parallel, such as Figure 1 As shown. AC electronic switches can be easily controlled by weak current signals, such as by MCU, which is very convenient for application in various occasions and has a good application prospect.

[0080] Although the solid-state switch formed by anti-parallel connection of thyristors has the advantages of high voltage and large current, it cannot be controlled to shut down by weak current signals. Therefore, its use is greatly limited in situations where rapid shutdown is required.

[0081] like Figure 2The prior art shown is an IGBT-based electronic switch that can quickly realize bidirectional current cutting and conducting, but each set of switches requires 2 capacitors and 2 discharge resistors. If it is used to form a multi-way switch (such as a commonly used three-phase switch), it requires twice the number of switches. The capacitors and resistors, so the number of devices is large and the cost is high. In addition, it is necessary to lead out the midpoint of the switch, and the circuit is complicated, which affects the reliability of the device; in addition, the capacitor voltage is uncontrollable. When the switch is in the on state, the capacitor gradually discharges to zero voltage, and when the switch is turned off again, the main circuit current will continue to flow through the capacitor, charging the capacitor from zero voltage. Therefore, the shutdown time of the disclosed technology is long, and fast shutdown cannot be achieved.

[0082] like Figure 3 In the prior art shown, when an overcurrent, short circuit or other fault occurs and the switch needs to be turned off, the RC absorption circuit therein is difficult to completely absorb the induced voltage, so it is necessary to add MOV devices such as varistors, etc., and such surge protection devices have low reliability and will fail when the impact energy is large or there are multiple impacts, resulting in a decrease in the life and reliability of the device.

[0083] Therefore, the AC electronic switches in the related art have technical problems such as complex circuit structure, high cost, low reliability, and slow response speed.

[0084] In order to solve the above technical problems, the AC electronic switch module provided in the embodiment of the present disclosure can simplify the circuit structure, thereby reducing the cost, while improving the reliability and achieving a faster response speed.

[0085] Figure 4 A principle block diagram of a switch module provided in one embodiment of the present disclosure, the switch module can be applied to a single-phase AC transmission line, and is used to open or cut off the AC current path between an input port A and an output port B. The switch module is controlled by a first control terminal, the first control terminal is connected to the switch module, and the first control terminal is configured to control the switch module according to a received host computer instruction.

[0086] Figure 5 A principle block diagram of a switch module provided by another embodiment of the present disclosure, wherein A is an input port, B is an output port, Line represents a grid input terminal, a power supply input terminal or a distribution terminal, that is, a 0.4kv transmission line, Load represents a load, N is a grid zero line or a power supply zero line, and a first control terminal is configured to control each circuit in the switch module; the switch module includes: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit;

[0087] Figure 6 A circuit diagram of a switch module provided in an embodiment of the present disclosure is applied to a single-phase AC transmission line. Figure 7A mark provided for an embodiment of the present disclosure Figure 6 A circuit diagram of the symbols of components in the switch module shown; wherein N is the neutral line of the power grid, and L is the live line of the power grid; the first switch circuit is configured to turn on or off the first switch circuit according to the instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the input terminal of the power grid, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; at least two switch units are connected in reverse parallel to form the first switch circuit; the semiconductor switch devices in the switch module are connected in reverse series, and the two ends of the switch unit are connected to the input terminal and the output terminal, and then at least two switch units are connected in reverse parallel to form the first switch circuit;

[0088] The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first absorption circuit is connected, and to pre-charge the first absorption circuit; the first pre-charging circuit includes: a first pre-charging resistor R1 and a first switch S1, and the first pre-charging resistor R1 and the first switch S1 are connected in parallel; when the first absorption circuit is connected, the first switch is disconnected, and the first pre-charging resistor is used to limit the current at the moment when the first absorption circuit is connected; the present disclosure adopts an innovative topological circuit structure, and the first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit, and is integrated into a standardized power device, which simplifies the circuit structure, and the overall cost of the switch module is lowered by the standardized power device, saving the manufacturing cost;

[0089] The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least three groups of diodes connected in series in pairs; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shut-down process, and the first absorption unit includes at least one capacitor;

[0090] Figure 7 In the embodiment, the first absorption circuit is connected in parallel with the first switch circuit through the first pre-charging circuit, the first absorption unit includes at least one capacitor C, and the first rectification unit includes three groups of diodes connected in series in pairs, which are respectively the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8 from top to bottom and from left to right, wherein the third diode D3 and the fourth diode D4 form a group, the fifth diode D5 and the sixth diode D6 form a group, and the seventh diode D7 and the eighth diode D8 form a group;

[0091] The first discharge circuit is electrically connected to the first switch circuit via the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit;

[0092] The switch module is controlled by a first control terminal, the first control terminal is connected to the switch module, and the first control terminal is configured to control the switch module according to a received command from a host computer.

[0093] The switch module provided in the embodiment of the present disclosure adopts an innovative topological circuit structure to achieve a fast response switching speed of milliseconds. The use of standardized power devices makes the overall cost of the switch module lower, saves manufacturing costs, and the energy consumption of the switch module itself is low.

[0094] In an optional implementation of the present disclosure, the first switch circuit includes at least a first switch unit and a second switch unit;

[0095] The first switch unit at least includes a first semiconductor switch device and a first diode, the drain and source of the first semiconductor switch device are respectively connected to the grid input terminal and the anode of the first diode, and the cathode of the first diode is connected to the load;

[0096] The second switch unit at least includes a second semiconductor switch device and a second diode, the source and drain of the second semiconductor switch device are respectively connected to the grid input terminal and the cathode of the second diode, and the anode of the second diode is connected to the load. It should be noted that the embodiment of the present disclosure does not limit the number of the first semiconductor switch device and the second semiconductor switch device.

[0097] Figure 7 In the figure, the first switch circuit is divided into two reverse-parallel switch units, the first switch unit located at the top is composed of a first semiconductor switch device Q1 and a first diode D1, and the second switch unit located at the bottom is composed of a second semiconductor switch device Q2 and a second diode D2; wherein the first semiconductor switch device Q1 has a controllable part that can receive instructions and an uncontrollable part inside, and the uncontrollable part can be a diode.

[0098] In an optional embodiment of the present disclosure, the semiconductor switch device is a reverse-conducting power semiconductor device. The semiconductor switch device can be any one of IGBT, MOSFET or IGCT.

[0099] In an optional implementation of the present disclosure, in the first absorption circuit, the first rectifying unit is connected in series with the first absorption unit;

[0100] In the first rectifying unit, the diodes are connected in series in pairs, and the diodes in each group are connected in forward direction in series; the groups of diodes connected in series in pairs are connected in parallel, and are also connected in parallel with the capacitor.

[0101] In an optional implementation manner of the present disclosure, in the first absorption circuit:

[0102] The input end and the output end of the first switch circuit are electrically connected to the midpoints of the groups of diodes connected in series of the first rectifying unit respectively;

[0103] The first rectifier unit is electrically connected to the neutral line of the power grid.

[0104] In an optional implementation of the present disclosure, the first discharge circuit includes:

[0105] At least one discharge resistor,

[0106] A semiconductor switch tube or a mechanical switch is connected in series with a discharge resistor;

[0107] Wherein, one end of the first discharge circuit is connected to the ground wire.

[0108] Figure 7 In the embodiment, the first discharge circuit is connected in parallel with the first absorption circuit, and the first discharge circuit includes a discharge resistor R2 and a semiconductor switch tube Q3, wherein the discharge resistor R2 and the semiconductor switch tube Q3 are connected in series, and the semiconductor switch tube Q3 can be any one of IGBT, MOSFET or IGCT.

[0109] Described below Figure 7 The working principle of the switch module shown in the single-phase AC transmission line.

[0110] In the initial state, the switch module is just connected to the circuit, and the first switch S1 in the first pre-charging circuit is in the disconnected state. In order to prevent the current surge from damaging the electronic components, the first pre-charging resistor R1 can play a role in current limiting. At the same time, the first pre-charging resistor R1 can also play a role in pre-charging the capacitor C. The rated voltage of the capacitor C is a fixed value, which can be 450V, 680V or 1kv, etc. Those skilled in the art can select the corresponding value according to actual needs;

[0111] Taking the rated voltage of capacitor C as 450V as an example, at the moment when the switch module is connected to the transmission line, the current surge of the circuit may charge capacitor C to about 300V. When the switch module works normally, the first switch S1 is closed, and the capacitor C that can store electric energy absorbs the electric energy in the loop inductance during the shutdown process of the switch module, which can continuously push the capacitor voltage from about 300V to a higher value. When the voltage of the capacitor exceeds 430V (this value can be set as needed, because the rated voltage of 450V is taken as an example, it is more appropriate to set this value to 430V), the semiconductor switch tube Q3 in the first discharge circuit starts to operate, and slowly and steadily releases the electric energy exceeding 430V, so that the voltage of capacitor C is maintained near the preset voltage;

[0112] It should be noted that the control method of the capacitor C can also be: when the voltage difference fluctuation of the capacitor C is set to exceed a fixed value, the semiconductor switch tube Q3 is activated to release the electric energy of the capacitor C, that is, the capacitor C discharges the discharge resistor R2, and the DC terminal voltage of the capacitor C is reduced, so that the voltage of the capacitor meets the requirements; further, if the voltage difference of the capacitor C is set to 20V (assuming the preset voltage is 420V, the voltage difference is set to 20V), that is, when the voltage of the capacitor C is 440V, the semiconductor switch tube Q3 is activated to release the electric energy of the capacitor C, so that the working voltage of the capacitor C is reduced to 420V, which meets the requirements.

[0113] The switch module provided by the embodiment of the present disclosure is applied to an AC circuit. Under the action of positive and negative currents, the two switch units in the first switch circuit are alternately turned on or off. For the first semiconductor switch device Q1 of the first switch unit, when the switch module is connected to the grid input terminal, the forward current flows through the first semiconductor switch device Q1, flows through the fifth diode D5 in the first absorption circuit, and the forward current is rectified by the fifth diode D5 and flows through the positive electrode of the capacitor C, flows through the negative electrode of the capacitor C and flows through the eighth diode D8, and then is output from the B terminal of the switch module to form a loop.

[0114] When the switch module is connected to the grid input terminal, the negative current flows through the second semiconductor switch device Q2 and the second diode D2, and flows through the seventh diode D7 in the first absorption circuit. The negative current is rectified by the seventh diode D7 and flows through the positive electrode of the capacitor C, and flows through the sixth diode D6 through the negative electrode of the capacitor C, and then output from the A terminal of the switch module to form a loop.

[0115] When the first switch circuit is not working, when the switch module is connected to the grid input, the current flows through the seventh diode D7 in the first absorption circuit, rectified, flows through the positive electrode of the capacitor C, flows through the negative electrode of the capacitor C, flows through the sixth diode D6, and is then output by the N line of the switch module to form a loop.

[0116] Figure 8 A circuit diagram of a switch module provided by another embodiment of the present disclosure, and Figure 7 Compared to the switch module shown, Figure 8 The positions of the diodes and semiconductor switching devices in the switching unit shown have changed. Figure 8 The diode is in front and the semiconductor switch device is in the back; the first switch unit located at the top is composed of the first diode D1 and the first semiconductor switch device Q1, and the second switch unit located at the bottom is composed of the second diode D2 and the second semiconductor switch device Q2. The role of each component in the circuit and the working principle of the switch module are similar to Figure 7 The same is not repeated here.

[0117] The switch module provided by the embodiment of the present disclosure can be applied to a three-phase three-wire power supply scenario or a three-phase four-wire power supply scenario, and can share the first discharge circuit and the N line, or can not share the first discharge circuit and the N line; wherein, the three-phase three-wire refers to the 10KV high voltage input output by the substation to the transformer to reduce the voltage to 0.4kv during power grid transmission and distribution, and the three phases are respectively three wires, and in actual applications, the three wires have different corresponding colors; on the basis of the three wires, a neutral wire can be added to obtain a three-phase four wire, and the neutral wire is the zero wire, that is, the N line in the embodiment of the present disclosure. It should be noted that the embodiment of the present disclosure is to explain the three-phase three-wire and three-phase four-wire, and does not constitute a limitation on the technical solution of the present disclosure. The switch module provided by the embodiment of the present disclosure can also be applied to the three-phase five-wire power supply scenario (adding a ground wire on the basis of the three-phase four-wire to become a three-phase five-wire).

[0118] Fig. 9 A schematic diagram of a three-phase four-wire switch module that shares a first discharge circuit and a common N line provided in an embodiment of the present disclosure, wherein the N line is a grid neutral line, and the L1, L2, and L3 lines are three-phase lines of the grid respectively; under the transformer, any phase line and the neutral line are taken to form a 220V voltage in the power supply line for use by general residential users, that is, in a 220V usage scenario, there are two lines, one line is a live line, and the other line is a neutral line.

[0119] Fig. 9 In the embodiment, the switch module further comprises: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a third switch circuit, a third absorption circuit and a third pre-charging circuit;

[0120] The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0121] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected, and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch, and the second pre-charging resistor is connected in parallel with the second switch. Before connection, the second switch in the second pre-charging circuit is disconnected, and the second pre-charging resistor is connected to the circuit to limit the current at the moment when the second absorption circuit is connected, thereby achieving the effect of protecting the second absorption circuit.

[0122] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the loop during the shut-off process of the second switch circuit, and the second absorption unit includes at least one capacitor; the present disclosure adopts an innovative topological circuit structure, and the second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit, and integrated into a standardized power device, and the overall cost of the switch module is lowered by the standardized power device, saving the manufacturing cost;

[0123] The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0124] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected, and pre-charge the third absorption circuit; the third pre-charging circuit includes: a third pre-charging resistor and a third switch, and the third pre-charging resistor is connected in parallel with the third switch; before connection, the third switch in the third pre-charging circuit is disconnected, and the third pre-charging resistor is connected to the circuit to limit the current at the moment when the third absorption circuit is connected, so as to achieve the effect of protecting the third absorption circuit; the present disclosure adopts an innovative topological circuit structure, and the third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit, and integrated into a standardized power device. The standardized power device makes the overall cost of the switch module lower, saving the manufacturing cost;

[0125] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the third switch circuit during the shutdown process, and the third absorption unit includes at least one capacitor;

[0126] One end of the second absorption circuit is connected to the grid neutral line through the fifth node N5 and the first node N1, and one end of the third absorption circuit is connected to the grid neutral line through the sixth node N6 and the first node N1; the three phases can share the N line through the connection of each node, and the three-phase imbalance problem can be solved by the connection mode of sharing the N line;

[0127] The other end of the second absorption circuit is electrically connected to the third node N3 and the fourth node N4 of the first discharge circuit through the second node N2 and the seventh node N7, and the other end of the third absorption circuit is electrically connected to the third node N3 and the fourth node N4 of the first discharge circuit through the ninth node N9 and the eighth node N8. The three phases can share the first discharge circuit through the connection of each node, and the sharing of the first discharge circuit can make the phases in the three-phase circuit have balanced charging and discharging, so as to achieve the effect of uniformly charging and discharging the capacitor.

[0128] Fig. 9 In the switch module shown, R2 and Q3 are connected in series to form a first discharge circuit, and the functions and roles of the following components in the circuit are equivalent:

[0129] Q1 is equivalent to Q1' and Q1''; Q2 is equivalent to Q2' and Q2''; D1 is equivalent to D1' and D1''; D2 is equivalent to D2' and D2''; D3 is equivalent to D3' and D3''; D4 is equivalent to D4' and D4''; D5 is equivalent to D5' and D5''; D6 is equivalent to D6' and D6''; D7 is equivalent to D7' and D7''; D8 is equivalent to D8' and D8''; R1 is equivalent to R1' and R1''; S1 is equivalent to S1' and S1''; C is equivalent to C' and C''.

[0130] In the switch module provided in the embodiment of the present disclosure, three phases share the first discharge circuit and the N line, and the first control end, the second control end and the third control end can be the same control end or different control ends.

[0131] Fig.10 A schematic diagram of a three-phase four-wire switch module that shares an N line and does not share a first discharge circuit provided by an embodiment of the present disclosure, wherein the switch module further includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a second discharge circuit, a third switch circuit, a third absorption circuit, a third pre-charging circuit, and a third discharge circuit;

[0132] The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0133] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch, and the second pre-charging resistor is connected in parallel with the second switch. The present disclosure adopts an innovative topological circuit structure, and the second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit, and integrated into a standardized power device. The standardized power device makes the overall cost of the switch module lower, saving manufacturing costs.

[0134] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the second switch circuit, and the second absorption unit includes at least one capacitor;

[0135] The second discharge circuit is electrically connected to the second switch circuit via the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit;

[0136] The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0137] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected and to pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch, and the third pre-charging resistor is connected in parallel with the third switch. The present disclosure adopts an innovative topological circuit structure, and the third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit, and integrated into a standardized power device. The standardized power device makes the overall cost of the switch module lower, saving the manufacturing cost.

[0138] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the third switch circuit during the shutdown process, and the third absorption unit includes at least one capacitor;

[0139] The third discharge circuit is electrically connected to the third switch circuit via the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the second absorption circuit;

[0140] The second absorption circuit is connected to the grid neutral line through the fifth node N5 and the first node N1, and the third absorption circuit is connected to the grid neutral line through the sixth node N6 and the first node N1. The first absorption circuit is connected to the grid neutral line through the first node N1, and each absorption circuit is connected to the grid neutral line through a node, so that the three phases share the N line, and the three-phase imbalance problem is solved by the connection mode of sharing the N line.

[0141] Fig.10 In the switch module shown, R2' and Q3' are connected in series to form a first discharge circuit, R2'' and Q3'' are connected in series to form a second discharge circuit, and R2'' and Q3'' are connected in series to form a third discharge circuit; L1, L2 and L3 represent the first phase, the second phase and the third phase respectively. The three phases of the three-phase alternating current are the first phase, the second phase and the third phase respectively. Their voltage waveforms are sinusoidal waves, and the phase difference is 120 degrees. There is a potential difference between the first phase, the second phase and the third phase. The current flows from the phase with the highest potential among the three phases to the other phase with the lowest potential. Therefore, when any phase is selected as a single phase, any one of the other two phases is used as part of the single-phase circuit; L1, L2, and L3 are discharged by their corresponding discharge circuits respectively, and the discharge of each phase is more targeted, which can further adjust the three-phase imbalance phenomenon.

[0142] Fig.10The functions of the following components are equivalent to the roles they play in the circuit:

[0143] Q1 is equivalent to Q1' and Q1''; Q2 is equivalent to Q2' and Q2''; D1 is equivalent to D1' and D1''; D2 is equivalent to D2' and D2''; D3 is equivalent to D3' and D3''; D4 is equivalent to D4' and D4''; D5 is equivalent to D5' and D5''; D6 is equivalent to D6' and D6''; D7 is equivalent to D7' and D7''; D8 is equivalent to D8' and D8''; R1 is equivalent to R1' and R1''; S1 is equivalent to S1' and S1''; C is equivalent to C' and C''.

[0144] In the switch module provided by the embodiment of the present disclosure, the three phases share the N line and do not share the first discharge circuit. The first control end, the second control end and the third control end can be the same control end or different control ends.

[0145] Fig.11 A schematic diagram of a three-phase three-wire switch module that shares a first discharge circuit and does not share an N line provided in an embodiment of the present disclosure, wherein the switch module includes, from top to bottom, a first switch module, a second switch module, and a third switch module;

[0146] The first switch module includes: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit; the first switch circuit is configured to turn on or off the first switch circuit according to the instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions; the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; at least two switch units are connected in reverse parallel to form the first switch circuit;

[0147] The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first switch module is connected and pre-charge the first absorption circuit. The first pre-charging circuit includes: a first pre-charging resistor and a first switch, and the first pre-charging resistor is connected in parallel with the first switch.

[0148] The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least two groups of diodes connected in series; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shut-down process, and the first absorption unit includes at least one capacitor;

[0149] The first discharge circuit is electrically connected to the first switch circuit via the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit;

[0150] The first switch module is controlled by a first control terminal, the first control terminal is connected to the first switch module, and the first control terminal is configured to control the first switch module according to a received command from a host computer;

[0151] The second switch module includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit and a second discharge circuit; the second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the second switch circuit;

[0152] The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second switch module is connected and pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch, and the second pre-charging resistor is connected in parallel with the second switch.

[0153] The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit includes: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit includes at least two groups of diodes connected in series; the second absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the second switch circuit, and the second absorption unit includes at least one capacitor;

[0154] The second discharge circuit is electrically connected to the second switch circuit via the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit;

[0155] The second switch module is controlled by a second control terminal, the second control terminal is connected to the second switch module, and the second control terminal is configured to control the second switch module according to a received command from the host computer;

[0156] The third switch module includes: a third switch circuit, a third absorption circuit, a third pre-charging circuit and a third discharge circuit; the third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device and the diode are connected in series; at least two switch units are connected in reverse parallel to form the third switch circuit;

[0157] The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third switch module is connected and pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch.

[0158] The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit includes: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit includes at least two groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the third switch circuit, and the third absorption unit includes at least one capacitor;

[0159] The third discharge circuit is electrically connected to the third switch circuit via the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the third absorption circuit;

[0160] The third switch module is controlled by a third control terminal, the third control terminal is connected to the third switch module, and the third control terminal is configured to control the third switch module according to a received command from the host computer;

[0161] When the first discharge circuit, the second discharge circuit and the third discharge circuit are the same discharge circuit, the second switch module is connected to the discharge circuit with the third node N3 and the fourth node N4 of the first switch module through the second node N2 and the seventh node N7; the second switch module and the third switch module share the discharge circuit with the first switch module through the third node N3 and the fourth node N4. Each module is connected to the discharge circuit through the corresponding node, and the third node N3 and the fourth node N4 are shared, so that the first switch module, the second switch module and the third switch module share the discharge circuit, and the shared discharge circuit makes each phase in the three-phase circuit have balanced charging and discharging, so as to achieve the effect of uniformly charging and discharging the capacitor.

[0162] The first discharge circuit, the second discharge circuit and the third discharge circuit may be the same discharge circuit or may not be the same discharge circuit; Fig.11 The switch module shown is a case where the first discharge circuit, the second discharge circuit and the third discharge circuit are the same discharge circuit. In this case, the three phases share the first discharge circuit.

[0163] Fig.11 In the figure, L1, L2 and L3 represent the first phase, the second phase and the third phase respectively. The three phases of the three-phase alternating current are the first phase, the second phase and the third phase respectively. Their voltage waveforms are sinusoidal waves, and the phase difference is 120 degrees. There is a potential difference between the first phase, the second phase and the third phase. The current flows from the phase with the highest potential among the three phases to the other phase with the lowest potential. Therefore, when any phase is selected as a single phase, any one of the other two phases serves as part of the single-phase circuit.

[0164] Fig.11 The functions of the following components are equivalent to the roles they play in the circuit:

[0165] Q1 is equivalent to Q1' and Q1''; Q2 is equivalent to Q2' and Q2''; D1 is equivalent to D1' and D1''; D2 is equivalent to D2' and D2''; D3 is equivalent to D3' and D3''; D4 is equivalent to D4' and D4''; D5 is equivalent to D5' and D5''; D6 is equivalent to D6' and D6''; D7 is equivalent to D7' and D7''; D8 is equivalent to D8' and D8''; R1 is equivalent to R1' and R1''; S1 is equivalent to S1' and S1''; C is equivalent to C' and C''.

[0166] In the switch module provided by the embodiment of the present disclosure, the three phases share the first discharge circuit and do not share the N line; the first control end, the second control end and the third control end can be the same control end, and the switch modules of each phase are uniformly controlled by one control end, or they can be different control ends, and the switch modules of each phase are separately controlled by different control ends.

[0167] Using the switch module provided by the embodiment of the present disclosure in a three-phase transmission line or a single-phase transmission line can reduce the power loss in the switching process in the line, and the energy consumption of the switch module itself is lower.

[0168] The present disclosure also provides a power transmission device using any one of the switch modules described above, the power transmission device comprising:

[0169] At least two switch modules are provided in two power transmission lines and are communicatively connected with the power grid.

[0170] The three-phase switch module provided in the embodiment of the present disclosure can be applied to a two-way power transmission scenario or power transmission line; when a load on one of the three-phase switch modules fails and needs to be repaired and the power transmission on that route is cut off, the three-phase switch module in the embodiment of the present disclosure can be used to quickly switch and start any one of the other two routes without affecting the normal operation of other loads on that route;

[0171] In a power transmission and electricity consumption scenario with two power supply lines, the switch module provided by the embodiment of the present disclosure can achieve rapid switching to another power transmission line in milliseconds, so that equipment requiring uninterrupted power supply can also operate normally when the other line is under maintenance, reducing user losses.

[0172] It can be seen from the above description that the embodiments of the present disclosure achieve the following technical effects:

[0173] The switch module provided by the present disclosure adopts an innovative topological circuit structure to achieve a fast response switch in milliseconds;

[0174] The use of standardized power devices reduces the overall cost of the switch module and saves manufacturing costs;

[0175] Using the switch module provided by the embodiment of the present disclosure in a three-phase transmission line or a single-phase transmission line can reduce the power loss in the switching process in the line, and the energy consumption of the switch module itself is low;

[0176] In a power transmission and electricity consumption scenario with two power supply lines, the switch module provided by the embodiment of the present disclosure can achieve rapid switching to another transmission line in milliseconds, so that equipment requiring uninterrupted power supply can also operate normally when the other line is being repaired, reducing user losses.

[0177] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A switch module, characterized in that: include: a first switching circuit, a first absorption circuit, a first pre-charging circuit, and a first discharging circuit; The first switch circuit is configured to turn on or off the first switch circuit according to an instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; The switch unit is connected to the input end of the power grid and is configured to conduct or cut off the current flowing in both directions. The switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode. The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first absorption circuit is connected and to pre-charge the first absorption circuit. The first pre-charging circuit comprises: a first pre-charging resistor and a first switch, wherein the first pre-charging resistor and the first switch are connected in parallel; The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least three groups of diodes connected in series in pairs; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shutdown process, and the first absorption unit includes at least one capacitor; The first discharge circuit is electrically connected to the first switch circuit through the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit; The switch module is controlled by a first control terminal, the first control terminal is connected to the switch module, and the first control terminal is configured to control the switch module according to a received host computer instruction.

2. The switch module according to claim 1, characterized in that: The first switch circuit comprises at least a first switch unit and a second switch unit; The first switch unit at least includes a first semiconductor switch device and a first diode, the drain and source of the first semiconductor switch device are respectively connected to the grid input terminal and the anode of the first diode, and the cathode of the first diode is connected to the load; The second switch unit at least includes a second semiconductor switch device and a second diode, wherein a source and a drain of the second semiconductor switch device are respectively connected to a grid input terminal and a cathode of the second diode, and an anode of the second diode is connected to a load.

3. The switch module according to claim 1, characterized in that: The semiconductor switch device is a reverse conducting power semiconductor device.

4. The switch module according to claim 1, characterized in that: In the first absorption circuit, the first rectifying unit is connected in series with the first absorption unit; In the first rectifying unit, the diodes connected in series in pairs are connected in forward direction in each group; the diodes connected in series in pairs are connected in parallel in each group and are connected in parallel with the capacitor.

5. The switch module according to claim 1, characterized in that: In the first absorption circuit: The input end and the output end of the first switch circuit are electrically connected to the midpoints of the groups of diodes connected in series of the first rectifying unit respectively; The first rectifying unit is electrically connected to the neutral line of the power grid.

6. The switch module according to any one of claims 1 to 3, characterized in that: The first discharge circuit comprises: At least one discharge resistor, A semiconductor switch tube or a mechanical switch is connected in series with a discharge resistor; Wherein, one end of the first discharge circuit is connected to the ground wire.

7. The switch module according to claim 1, characterized in that: The switch module further includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a third switch circuit, a third absorption circuit and a third pre-charging circuit; The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch. The second pre-charging resistor is connected in parallel with the second switch. The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit comprises: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit comprises at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the second switch circuit during the shutdown process, and the second absorption unit comprises at least one capacitor; The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected and to pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch. The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit comprises: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit comprises at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the third switch circuit, and the third absorption unit comprises at least one capacitor; One end of the second absorption circuit is connected to the grid neutral line through the fifth node and the first node, and one end of the third absorption circuit is connected to the grid neutral line through the sixth node and the first node; The other end of the second absorption circuit is electrically connected to the third node and the fourth node of the first discharge circuit through the second node and the seventh node, and the other end of the third absorption circuit is electrically connected to the third node and the fourth node of the first discharge circuit through the ninth node and the eighth node.

8. The switch module according to claim 1, characterized in that: The switch module further includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit, a second discharge circuit, a third switch circuit, a third absorption circuit, a third pre-charging circuit and a third discharge circuit; The second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second absorption circuit is connected and to pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch. The second pre-charging resistor is connected in parallel with the second switch. The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit comprises: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit comprises at least three groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the second switch circuit during the shutdown process, and the second absorption unit comprises at least one capacitor; The second discharge circuit is electrically connected to the second switch circuit through the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit; The third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third absorption circuit is connected and to pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch. The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit comprises: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit comprises at least three groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the third switch circuit, and the third absorption unit comprises at least one capacitor; The third discharge circuit is electrically connected to the third switch circuit through the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the second absorption circuit; The second absorption circuit is connected to the neutral line of the power grid via the fifth node and the first node, and the third absorption circuit is connected to the neutral line of the power grid via the sixth node and the first node.

9. A switch module, characterized in that: The switch module comprises: a first switch module, a second switch module and a third switch module; The first switch module includes: a first switch circuit, a first absorption circuit, a first pre-charging circuit and a first discharge circuit; the first switch circuit is configured to turn on or off the first switch circuit according to the instruction received from the first control terminal, and the first switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal and is configured to turn on or off the current flowing in both directions; the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The first pre-charging circuit is connected in series with the first absorption circuit and then connected in parallel with the first switch circuit. The first pre-charging circuit is configured to limit the current at the moment when the first switch module is connected and pre-charge the first absorption circuit. The first pre-charging circuit includes: a first pre-charging resistor and a first switch. The first pre-charging resistor is connected in parallel with the first switch. The first absorption circuit is configured to absorb the electric energy generated when the first pre-charging circuit and the first switching circuit are working, and the first absorption circuit includes: a first rectifying unit and a first absorption unit, and the first absorption unit is electrically connected to the first rectifying unit; the first rectifying unit is configured to rectify the current generated during the switching process of the switching unit, and the first rectifying unit includes at least two groups of diodes connected in series; the first absorption unit is configured to absorb the electric energy generated by the first switching circuit during the shutdown process, and the first absorption unit includes at least one capacitor; The first discharge circuit is electrically connected to the first switch circuit through the first absorption circuit, and the first discharge circuit is configured to release the energy stored in the first absorption circuit; The first switch module is controlled by a first control terminal, the first control terminal is connected to the first switch module, and the first control terminal is configured to control the first switch module according to a received command from a host computer; The second switch module includes: a second switch circuit, a second absorption circuit, a second pre-charging circuit and a second discharge circuit; the second switch circuit is configured to turn on or off the second switch circuit according to the instruction received from the second control terminal, and the second switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The second pre-charging circuit is connected in series with the second absorption circuit and then connected in parallel with the second switch circuit. The second pre-charging circuit is configured to limit the current at the moment when the second switch module is connected and pre-charge the second absorption circuit. The second pre-charging circuit includes: a second pre-charging resistor and a second switch, and the second pre-charging resistor is connected in parallel with the second switch. The second absorption circuit is configured to absorb the electric energy generated when the second pre-charging circuit and the second switch circuit are working, and the second absorption circuit comprises: a second rectifying unit and a second absorption unit, and the second absorption unit is electrically connected to the second rectifying unit; the second rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the second rectifying unit comprises at least two groups of diodes connected in series in pairs; the second absorption unit is configured to absorb the electric energy generated by the second switch circuit during the shutdown process, and the second absorption unit comprises at least one capacitor; The second discharge circuit is electrically connected to the second switch circuit through the second absorption circuit, and the second discharge circuit is configured to release the energy stored in the second absorption circuit; The second switch module is controlled by a second control terminal, the second control terminal is connected to the second switch module, and the second control terminal is configured to control the second switch module according to a received command from a host computer; The third switch module includes: a third switch circuit, a third absorption circuit, a third pre-charging circuit and a third discharge circuit; the third switch circuit is configured to turn on or off the third switch circuit according to the instruction received from the third control terminal, and the third switch circuit includes at least two switch units connected in reverse parallel; the switch unit is connected to the grid input terminal, and is configured to turn on or off the current flowing in both directions, and the switch unit includes at least one semiconductor switch device and a diode, and the semiconductor switch device is connected in series with the diode; The third pre-charging circuit is connected in series with the third absorption circuit and then connected in parallel with the third switch circuit. The third pre-charging circuit is configured to limit the current at the moment when the third switch module is connected and pre-charge the third absorption circuit. The third pre-charging circuit includes: a third pre-charging resistor and a third switch. The third pre-charging resistor is connected in parallel with the third switch. The third absorption circuit is configured to absorb the electric energy generated when the third pre-charging circuit and the third switch circuit are working, and the third absorption circuit comprises: a third rectifying unit and a third absorption unit, and the third absorption unit is electrically connected to the third rectifying unit; the third rectifying unit is configured to rectify the current generated during the switching process of the switch unit, and the third rectifying unit comprises at least two groups of diodes connected in series in pairs; the third absorption unit is configured to absorb the electric energy generated by the circuit during the shut-down process of the third switch circuit, and the third absorption unit comprises at least one capacitor; The third discharge circuit is electrically connected to the third switch circuit through the third absorption circuit, and the third discharge circuit is configured to release the energy stored in the third absorption circuit; The third switch module is controlled by a third control terminal, the third control terminal is connected to the third switch module, and the third control terminal is configured to control the third switch module according to a received host computer instruction; When the first discharge circuit, the second discharge circuit and the third discharge circuit are the same discharge circuit, the second switch module connects the discharge circuit with the third node and the fourth node of the first switch module through the second node and the seventh node; the second switch module and the third switch module both share the discharge circuit with the first switch module through the third node and the fourth node.

10. A power transmission device using the switch module according to claim 1 or claim 9, characterized in that: The power transmission device comprises: At least two switch modules are provided in two power transmission lines and are communicatively connected with the power grid.

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