Solid-state switching device control device, control method and solid-state switching device

Abstract

The invention provides a solid-state switching device control device, a solid-state switching device control method and a solid-state switching device, and belongs to the technical field of solid-state switching device control, and the solid-state switching device control device comprises an electromagnetic execution module, a current identification module and a controller. Wherein the electromagnetic execution module is used for being connected with a mechanical switch of the solid-state switching device and generating induced current according to the opening action or closing action of the mechanical switch; the current identification module is used for being connected with the electromagnetic execution module and generating a state indication signal representing the state of the mechanical switch according to the induction current; the controller is used for being connected with the current identification module and generating a first control signal according to the state indication signal so as to control on-off of an electronic switch of the solid-state switching device. Thus, through the switching time sequence control of the mechanical switch and the electronic switch, the mechanical switch performs switching-off or switching-on action after no current exists in the main loop, so that the phenomenon of arc discharge in the switching-off and switching-on action process of the mechanical switch is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of solid-state switch electrical appliance control, and in particular to a solid-state switch electrical appliance control device, a control method and a solid-state switch electrical appliance. Background Art

[0002] Solid-state switching devices use electronic switches as the main switches, such as thyristors, insulated gate bipolar transistors, etc., to achieve power control. In practical applications, in order to ensure complete isolation between the power supply and the load, electronic switches alone cannot provide sufficient isolation safety. Therefore, in addition to electronic switches, solid-state switching devices usually also have mechanical switches in series as isolation breakpoints to provide complete physical disconnection and ensure safety.

[0003] Although mechanical switches can provide more stable isolation, when there is current in the main circuit, the gap between the contacts will change rapidly when the mechanical switch performs a closing or opening action, causing the electric field strength to increase rapidly in a short period of time. When the electric field strength exceeds a certain value, arc discharge will form between the contacts. Arc discharge will cause serious ablation and wear on the contacts of the mechanical switch, which can easily shorten the service life of the mechanical switch. Therefore, how to avoid arc discharge in the mechanical switch in the solid-state switch device during the opening or closing action is a problem that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present application provides a solid-state switch electrical appliance control device, a control method and a solid-state switch electrical appliance.

[0005] In a first aspect, the present application provides a solid-state switch electrical appliance control device, comprising:

[0006] An electromagnetic actuator module, used to be connected to a mechanical switch of a solid-state switch electrical appliance, and to generate an induced current according to an opening action or a closing action of the mechanical switch;

[0007] A current identification module, used to be connected to the electromagnetic execution module and generate a state indication signal representing the state of the mechanical switch according to the induced current;

[0008] The controller is used to be connected to the current identification module and generate a first control signal according to the state indication signal to control the on and off of the electronic switch of the solid-state switch electrical appliance.

[0009] Optionally, the electromagnetic execution module includes an induction coil and a moving iron core;

[0010] The moving iron core is connected to the mechanical switch, and one end of the moving iron core away from the mechanical switch moves relative to the inner hollow part of the induction coil along the axis direction of the induction coil, so that when the mechanical switch performs the opening action or the closing action, the moving iron core is driven to move to generate the induced current in the induction coil;

[0011] Among them, the movement range of the moving iron core along the axial direction of the induction coil includes an opening range and an over-travel range; in the process of the mechanical switch performing the opening action, the moving iron core passes through the over-travel range and the opening range in sequence; when the moving iron core is located in the over-travel range, the mechanical switch is in a closed state.

[0012] Optionally, the moving iron core is magnetic.

[0013] Optionally, the induction coil includes a permanent magnet and a coil wound around the outside of the permanent magnet, so that when the moving iron core moves, the induction coil generates an induced current.

[0014] Optionally, the state indication signal includes a closing indication signal and an opening indication signal; the current identification module includes a current transmission circuit, a first identification circuit and a second identification circuit;

[0015] The current transmission circuit comprises a first identification terminal and a second identification terminal respectively connected to two ends of the induction coil, so that the induction current flows through the current transmission circuit in a first direction or a second direction;

[0016] A first identification circuit is connected to the first identification end, and is used to output the opening indication signal when the induced current flows through the current transmission circuit in a first direction;

[0017] The second identification circuit is connected to the second identification end, and is used for outputting the closing indication signal when the induced current flows through the current transmission circuit in a second direction.

[0018] Optionally, the current transmission circuit includes a first resistor, wherein the first resistor includes a first end connected to the first identification end and a second end connected to the second identification end.

[0019] Optionally, the first identification circuit includes a second resistor, a first switch tube and a first diode;

[0020] The first switch tube comprises a control electrode connected to the first identification terminal, a first electrode connected to the second resistor and the first diode, and a second electrode connected to ground;

[0021] The second resistor includes a first end connected to a power source and a second end connected to a first electrode of the first switch tube;

[0022] The first diode includes an anode connected to the power source and the first electrode of the first switch tube, and a cathode connected to the controller.

[0023] Optionally, the second identification circuit includes a third resistor, a second switch tube and a second diode;

[0024] The second switch tube comprises a control electrode connected to the second identification terminal, a first electrode connected to the third resistor and the second diode, and a grounded second electrode;

[0025] The third resistor comprises a first end connected to a power source and a second end connected to a first electrode of the second switch tube;

[0026] The second diode includes an anode connected to the power source and the first electrode of the second switch tube, and a cathode connected to the controller.

[0027] Optionally, a current monitoring module is also included, which is connected in series with the mechanical switch and the electronic switch, and is used to sample the current of the main circuit to obtain a sampling current, and output a second control signal according to the sampling current to control the on and off of the electronic switch.

[0028] In a second aspect, in one embodiment, the present application provides a solid-state switch electrical appliance control method, based on the above-mentioned solid-state switch electrical appliance control device, comprising:

[0029] According to the received status indication signal, determining whether the mechanical switch is in a closing completion state or an opening start state;

[0030] If the mechanical switch is in a closing state, generating a first control signal of a first state to control the electronic switch to be turned on;

[0031] If the mechanical switch is in the opening start state, a first control signal of a second state is generated to control the electronic switch to open.

[0032] Optionally, the status indication signal includes a closing indication signal and an opening indication signal;

[0033] The step of determining, according to the state indication signal, whether the mechanical switch is in a closing completion state or an opening start state comprises:

[0034] In response to the opening indication signal, determining that the mechanical switch is in an opening start state;

[0035] In response to the closing indication signal disappearing or the closing indication signal and the opening indication signal being alternately generated and then disappearing, it is determined that the mechanical switch is in a closing completion state.

[0036] In a third aspect, in one embodiment, the present application provides a solid-state switching device, including the solid-state switching device control device as described above.

[0037] Through the above technical solution, this application includes at least the following beneficial technical effects:

[0038] The electromagnetic execution module is connected to the mechanical switch of the solid-state switch electrical appliance so as to generate an induced current according to the opening and closing actions of the mechanical switch, and the action state of the mechanical switch can be converted into the induced current in real time. Then, the current identification module generates a state indication signal that can reflect the state of the mechanical switch according to the induced current, so that the controller generates a first control signal in real time according to the state indication signal. Since the response speed of the mechanical switch is slower than that of the electronic switch, when the controller uses the first control signal to control the on and off of the electronic switch, it can ensure that the electronic switch is turned on after the mechanical switch is completely closed, so as to avoid arc discharge during the closing action of the mechanical switch; and when the mechanical switch needs to be disconnected, the controller can turn off the electronic switch in advance, so that the electronic switch is already in the disconnected state before the mechanical switch starts to open, so as to avoid arc discharge during the opening action of the mechanical switch. In this way, through the switch timing control of the mechanical switch and the electronic switch, the mechanical switch always opens or closes after there is no current in the main circuit, thereby avoiding arc discharge during the opening and closing actions of the mechanical switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is a block diagram of a solid-state switch electrical appliance control device in one embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of an electromagnetic execution module in one embodiment of the present application;

[0042] Figure 3 This is a block diagram of a solid current identification module in one embodiment of the present application;

[0043] Figure 4 A circuit connection diagram of a solid-state switch electrical appliance control device in one embodiment of the present application;

[0044] Figure 5 This is a flow chart of a solid-state switch electrical appliance control method in one embodiment of the present application.

[0045] Explanation of the accompanying drawings: 1. Electromagnetic execution module; 11. Moving iron core; 12. Induction coil; 2. Current identification module; 21. Current transmission circuit; 22. First identification circuit; 23. Second identification circuit; 3. Controller; 4. Current monitoring module. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0047] In the description of the present application, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0048] First, as Figure 1 As shown, in one embodiment, the present application provides a solid-state switch electrical appliance control device, which includes an electromagnetic execution module 1, a current identification module 2, and a controller 3. Among them, the electromagnetic execution module 1 is used to connect with the mechanical switch S of the solid-state switch electrical appliance, and generate an induced current according to the opening action or closing action of the mechanical switch S; the current identification module 2 is used to connect with the electromagnetic execution module 1, and generate a state indication signal representing the state of the mechanical switch S according to the induced current; the controller 3 is used to connect with the current identification module 2, and generate a first control signal according to the state indication signal to control the on and off of the electronic switch of the solid-state switch electrical appliance.

[0049] The status indication signal includes a closing indication signal and an opening indication signal.

[0050] As an example, the mechanical switch S and the electronic switch are connected in series on the main circuit composed of the voltage source and the load, and the on and off of the main circuit are controlled by controlling the mechanical switch S and the electronic switch. For example, in order to avoid the mechanical switch S from performing an opening or closing action when there is current in the main circuit, when the main circuit needs to be connected, the electronic switch can be controlled to be turned on after the mechanical switch S performs the closing action to achieve the conduction of the main circuit. When the main circuit needs to be disconnected, the electronic switch is first controlled to be disconnected, and then the mechanical switch S is made to perform an opening action to achieve the disconnection of the main circuit. In the above embodiment, the electromagnetic execution module 1 is connected to the mechanical switch S of the solid-state switching electrical appliance so as to generate an induced current according to the opening and closing actions of the mechanical switch S, and the action state of the mechanical switch S can be converted into the induced current in real time. Then, the current identification module 2 generates a state indication signal that can reflect the state of the mechanical switch S according to the induced current, so that the controller 3 generates a first control signal in real time according to the state indication signal. Since the response speed of the mechanical switch S is slower than that of the electronic switch, when the controller 3 uses the first control signal to control the on and off of the electronic switch, it can ensure that the electronic switch is turned on after the mechanical switch S is completely closed, so as to avoid arc discharge during the closing action of the mechanical switch S; and when the mechanical switch S needs to be disconnected, the controller 3 can turn off the electronic switch in advance, so that the electronic switch is already in the disconnected state before the mechanical switch S starts to open, so as to avoid arc discharge during the opening action of the mechanical switch S. In this way, through the switch timing control of the mechanical switch S and the electronic switch, the mechanical switch S always opens or closes after there is no current in the main circuit, thereby avoiding arc discharge during the opening and closing actions of the mechanical switch S.

[0051] Reference Figure 2 As an implementation mode of the electromagnetic execution module 1, the electromagnetic execution module 1 includes an induction coil 12 and a moving iron core 11; the moving iron core 11 is connected to the mechanical switch S, and one end of the moving iron core 11 away from the mechanical switch S moves relative to the inner hollow part of the induction coil 12 along the axial direction of the induction coil 12, so that when the mechanical switch S performs an opening action or a closing action, the moving iron core 11 is driven to move to generate an induced current in the induction coil 12; wherein, the movement range of the moving iron core 11 along the axial direction of the induction coil 12 includes an opening distance range and an over-travel range, and in the process of the mechanical switch S performing the opening action, the moving iron core 11 passes through the over-travel range and the opening distance range in sequence, and when the moving iron core 11 is located in the over-travel range, the mechanical switch S is in a closed state.

[0052] In order to cut the magnetic flux lines to form the induced current, the moving iron core 11 has magnetism to form the magnetic flux lines, thereby generating the induced current. Alternatively, the induction coil 12 may include a permanent magnet and a coil wound around the outside of the permanent magnet, so that when the moving iron core 11 moves, the induction coil 12 generates the induced current.

[0053] The solid-state switch device may be a switch device such as a circuit breaker and a contactor. For example, when the solid-state switch device is a circuit breaker, the mechanical switch S may be an operating handle connected to the moving iron core 11 so as to drive the moving iron core 11 to move.

[0054] As an example, taking the moving iron core 11 as a magnetic iron core, during the closing process of the mechanical switch S, the moving iron core 11 moves toward the inner hollow portion close to the induction coil 12. Based on Lenz's law, it can be known that the induced current in the induction coil 12 flows from the direction close to the moving iron core 11 to the direction away from the moving iron core 11. During the opening process of the mechanical switch S, the moving iron core 11 moves toward the direction away from the induction coil 12. Based on Lenz's law, it can be known that the induced current in the induction coil 12 flows from the direction away from the moving iron core 11 to the direction close to the moving iron core 11, so that the current identification module 2 generates a status indication signal according to the flow direction of the induced current. As an example, refer to Figure 2 , Figure 2 It is a schematic diagram of the open distance range and the over-travel range. When the end of the moving iron core 11 close to the induction coil 12 moves within the over-travel range, the moving iron core 11 cuts the magnetic flux generated by the induction coil 12 and generates an induced current, but at this time the mechanical switch S is in the closed state. When the end of the moving iron core 11 close to the induction coil 12 is within the open distance range, the mechanical switch S is in the open state.

[0055] In the above embodiment, through the cooperation between the induction coil 12 and the moving iron core 11, the moving iron core 11 will generate induced currents with different directions on the induction coil 12 when it moves closer to the induction coil 12 and when it moves away from the induction coil 12. The moving iron core 11 will drive the mechanical switch S to close when it moves closer to the induction coil 12, and will drive the mechanical switch S to open when it moves away from the induction coil 12. In this way, it is possible to identify whether the mechanical switch S performs an opening action or a closing action through the direction of the induced current.

[0056] Reference Figure 3As an implementation of the current identification module 2, the current identification module 2 includes a current transmission circuit 21, a first identification circuit 22, and a second identification circuit 23; wherein the current transmission circuit 21 includes a first identification end and a second identification end respectively connected to two ends of the induction coil 12, so that the induced current flows through the current transmission circuit 21 in the first direction or the second direction. The first identification circuit 22 is connected to the first identification end, and is used to output a switch-off indication signal when the induced current flows through the current transmission circuit 21 in the first direction; the second identification circuit 23 is connected to the second identification end, and is used to output a switch-on indication signal when the induced current flows through the current transmission circuit 21 in the second direction.

[0057] As an example, combining Figure 4 , the first identification end may be end a, and the second identification end may be end b, that is, the first identification end may be connected to an end of the induction coil 12 close to the moving iron core 11, and the second identification end may be connected to an end of the induction coil 12 away from the moving iron core 11. The first direction of the induced current may be from the first identification end to the second identification end, and the second direction of the induced current may be from the second identification end to the first identification end.

[0058] In the above embodiment, the current identification module 2 and the induction coil 12 form a complete loop, so that the induced current generated on the induction coil 12 can flow directly to the current identification module 2. During the opening process of the mechanical switch S, the induced current in the induction coil 12 flows from a direction away from the moving iron core 11 to a direction close to the moving iron core 11, then flows to the current identification module 2 through the first identification end, and then returns to the induction coil 12 through the second identification end; during the closing process of the mechanical switch S, the induced current in the induction coil 12 flows from a direction close to the moving iron core 11 to a direction away from the moving iron core 11, then flows to the current identification module 2 through the second identification end, and then returns to the induction coil 12 through the first identification end. In this way, in the process of the mechanical switch S performing the opening action and the closing action, the direction of the induced current is different, so that the opening indication signal is generated by the first identification circuit 22 and the closing indication signal is generated by the second identification circuit 23.

[0059] Reference Figure 3 As an implementation of the current transmission circuit 21, the current transmission circuit 21 includes a first resistor R1, and the first resistor R1 includes a first end connected to the first identification end and a second end connected to the second identification end.

[0060] Reference Figure 3As an implementation of the first identification circuit 22, the first identification circuit 22 includes a second resistor R2, a first switch tube Q1 and a first diode D1; wherein the first switch tube Q1 includes a control electrode connected to the first identification end, a first electrode connected to the second resistor R2 and the first diode D1, and a second electrode connected to the ground; the second resistor R2 includes a first end connected to the power supply and a second end connected to the first electrode of the first switch tube Q1; the first diode D1 includes an anode connected to the power supply VCC and the first electrode of the first switch tube Q1, and a cathode connected to the controller 3.

[0061] In some embodiments, the first identification circuit 22 may further include a third diode D3 , wherein the third diode D3 includes an anode connected to the second electrode of the first switch tube Q1 and the second identification terminal and a grounded anode.

[0062] As an example, when the direction of the induced current flows from the first identification end to the second identification end, and the voltage at the second identification end is greater than the conduction voltage of the third diode D3, the third diode D3 is turned on, and at this time, the control electrode of the first switch tube Q1 receives the high-level signal from the first identification end, and the second electrode of the first switch tube Q1 is grounded through the third diode D3, so that a voltage difference is formed between the first electrode and the second electrode of the first switch tube Q1, thereby turning on the first switch tube Q1. After the first switch tube Q1 is turned on, the output voltage of the power supply is transmitted to the second identification end through the second electrode of the first switch tube Q1, and then returned to the induction coil 12 from the second identification end to form a complete loop.

[0063] As an example, by setting the third diode D3, the first switch tube Q1 and the ground can only be unidirectionally conducted, thereby achieving isolation between the first switch tube Q1 and the ground. And the third diode Q3 can only be conducted when the voltage at the second identification end is greater than the conduction voltage of the third diode D3, so that the third diode D3 is not conducted when a small stray current appears on the induction coil 12, thereby avoiding misconduction of the first switch tube Q1, and further avoiding the controller 3 from misidentifying the opening action.

[0064] In the above embodiment, the control electrode of the first switch tube Q1 is connected to the first identification terminal. When there is no induced current, the first identification terminal is in a low level state, the first switch tube Q1 is not turned on, and the voltage output by the power supply VCC flows to the controller 3 through the second resistor R2. The controller 3 continues to receive a high level signal to determine that the mechanical switch S is not in action. When the induced current is in the first direction, the first identification terminal is in a high level state to control the first switch tube Q1 to turn on, thereby pulling the anode of the first diode D1 down to the ground, so that the controller 3 detects that the mechanical switch S is performing a gate opening action.

[0065] Reference Figure 4As an implementation of the second identification circuit 23, the second identification circuit 23 includes a third resistor R3, a second switch tube Q2, and a second diode D2; wherein the second switch tube Q2 includes a control electrode connected to the second identification end, a first electrode connected to the third resistor R3 and the second diode D2, and a second electrode connected to the ground. The third resistor R3 includes a first end connected to the power supply VCC and a second end connected to the first electrode of the second switch tube Q2; the second diode D2 includes an anode connected to the power supply VCC and the first electrode of the second switch tube Q2, and a cathode connected to the controller 3.

[0066] In some embodiments, the second identification circuit 23 may further include a fourth diode D4, the fourth diode D4 including an anode connected to the second electrode of the second switch tube Q2 and the first identification end and a grounded anode. The working principle of the second identification circuit 23 is consistent with the working principle of the first identification circuit 22, and will not be repeated here.

[0067] In the above embodiment, the control electrode of the second switch tube Q2 is connected to the second identification terminal. When there is no induced current, the second identification terminal is in a low level state, the second switch tube Q2 is not turned on, and the voltage output by the power supply VCC flows to the controller 3 through the third resistor R3. The controller 3 continues to receive a high level signal to determine that the mechanical switch S is not in action. When the induced current is in the second direction, the second identification terminal is in a high level state to control the second switch tube Q2 to turn on, thereby pulling the anode of the second diode D2 down to the ground, so that the controller 3 detects that the mechanical switch S is performing a closing action.

[0068] Reference Figure 4 As a further implementation of the solid-state switch electrical appliance control device, the solid-state switch electrical appliance control device includes a current monitoring module 4, which is connected in series with the mechanical switch S and the electronic switch, and is used to sample the current of the main circuit to obtain a sampled current, and output a second control signal according to the sampled current to control the on and off of the electronic switch.

[0069] In the above implementation, the current monitoring module 4 can sample the sampling current on the main circuit, so as to output the second control signal when the current in the main circuit is too large, and timely control the electronic switch to be disconnected.

[0070] In a second aspect, in one embodiment, referring to Figure 5 The present application provides a solid-state switch electrical appliance control method, based on the above-mentioned solid-state switch electrical appliance control device, including steps S101 to S103, which are described in detail below.

[0071] Step S101: according to the received status indication signal, determine whether the mechanical switch S is in the closing completion state or the opening start state.

[0072] Step S102: If the mechanical switch S is in the closing state, a first control signal of a first state is generated to control the electronic switch to be turned on.

[0073] As an example, taking the electronic switch as an NMOS tube, the first state can be a high level state. If the mechanical switch S is in the closing completion state, it means that the contacts of the mechanical switch S have been stably closed, and during the closing action of the mechanical switch S, the electronic switch is not turned on, and no current flows in the main circuit, thereby avoiding arc discharge during the closing action of the mechanical switch S.

[0074] Step S103: If the mechanical switch S is in the opening start state, a first control signal of the second state is generated to control the electronic switch to be opened.

[0075] As an example, taking the electronic switch as an NMOS tube, the second state can be a low level state, and the mechanical switch S is in the start state of opening, that is, the moving iron core 12 is moving within the over-travel range, indicating that the mechanical switch S has not yet been disconnected. At this time, the electronic switch is controlled to be disconnected by generating the first control signal of the second state, so that before the moving iron core 12 moves within the opening distance range, the electronic switch is disconnected so that no current flows in the main circuit, thereby avoiding arc discharge during the opening action of the mechanical switch S.

[0076] In the above embodiment, the state indication signal enables the controller 3 to determine the state of the mechanical switch S to generate a first control signal of the first state or a first control signal of the second state, so as to control the electronic switch to be turned on after the mechanical switch S is closed and to be turned off before the mechanical switch S is turned off, so that the mechanical switch S will not generate an arc when performing an opening action or a closing action.

[0077] As an implementation of step S101, step S101 includes step S1011 to step S1012, which are described in detail below.

[0078] Step S1011: In response to the opening indication signal, determining that the mechanical switch S is in the opening start state.

[0079] As an example, receiving a trip indication signal indicates that the moving iron core 12 is already within the overtravel range and is moving toward the opening distance range. At this time, it should be immediately determined that the mechanical switch S is in the trip start state so as to timely control the electronic switch to disconnect before the mechanical switch S disconnects.

[0080] Step S1012: In response to the closing indication signal disappearing or the closing indication signal and the opening indication signal being alternately generated and then disappearing, it is determined that the mechanical switch S is in a closing completion state.

[0081] As an example, when the closing indication signal disappears, it means that the moving iron core 12 has stopped moving, that is, the moving iron core 12 has driven the contacts of the mechanical switch S to close, and the closing action is completed. The alternating generation of the closing indication signal and the opening indication signal indicates that the movement direction of the moving iron core 12 changes rapidly, that is, the contacts of the mechanical switch S have a bouncing feature, and the bouncing feature refers to the phenomenon that the mechanical switch S is bounced open by the reaction force after contact, and then bounced open again after contact, and so on repeatedly. The disappearance of the closing indication signal and the opening indication signal after the alternating generation also indicates that the moving iron core 12 has stopped moving, that is, the moving iron core 12 has driven the contacts of the mechanical switch S to close stably, thereby completing the closing action.

[0082] As an example, when a closing indication signal is received, it can also be determined that the mechanical switch S is in the closing start state. In the closing start state, a first control signal of the second state is generated to control the electronic switch to disconnect, thereby avoiding the existence of current in the main circuit due to the electronic switch not being properly closed during the last opening action.

[0083] In a third aspect, in one embodiment, the present application provides a solid-state switching device, including the solid-state switching device control device as described above.

[0084] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0085] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0086] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A solid-state switch electrical control device, characterized in that: include: An electromagnetic actuator module, used to be connected to a mechanical switch of a solid-state switch electrical appliance, and to generate an induced current according to an opening action or a closing action of the mechanical switch; A current identification module, used to be connected to the electromagnetic execution module and to generate a state indication signal representing the state of the mechanical switch according to the induced current; The controller is used to be connected to the current identification module and generate a first control signal according to the state indication signal to control the on and off of the electronic switch of the solid-state switch electrical appliance.

2. The solid-state switch control device according to claim 1, characterized in that: The electromagnetic execution module includes an induction coil and a moving iron core; The moving iron core is connected to the mechanical switch, and one end of the moving iron core away from the mechanical switch moves relative to the inner hollow part of the induction coil along the axis direction of the induction coil, so that when the mechanical switch performs the opening action or the closing action, the moving iron core is driven to move to generate the induced current in the induction coil; Among them, the movement range of the moving iron core along the axial direction of the induction coil includes an opening range and an over-travel range; in the process of the mechanical switch performing the opening action, the moving iron core passes through the over-travel range and the opening range in sequence; when the moving iron core is located in the over-travel range, the mechanical switch is in a closed state.

3. The solid-state switch control device according to claim 2, characterized in that: The moving iron core is magnetic.

4. The solid-state switch control device according to claim 2, characterized in that: The induction coil comprises a permanent magnet and a coil wound around the outside of the permanent magnet, so that when the moving iron core moves, the induction coil generates an induced current.

5. The solid-state switch control device according to claim 2, characterized in that: The state indication signal includes a closing indication signal and an opening indication signal; the current identification module includes a current transmission circuit, a first identification circuit and a second identification circuit; The current transmission circuit comprises a first identification terminal and a second identification terminal respectively connected to two ends of the induction coil, so that the induction current flows through the current transmission circuit in a first direction or a second direction; A first identification circuit is connected to the first identification end, and is used to output the opening indication signal when the induced current flows through the current transmission circuit in a first direction; The second identification circuit is connected to the second identification end, and is used for outputting the closing indication signal when the induced current flows through the current transmission circuit in a second direction.

6. The solid-state switch control device according to claim 5, characterized in that: The current transmission circuit includes a first resistor including a first end connected to the first identification end and a second end connected to the second identification end.

7. The solid-state switch control device according to claim 5, characterized in that: The first identification circuit includes a second resistor, a first switch tube and a first diode; The first switch tube comprises a control electrode connected to the first identification terminal, a first electrode connected to the second resistor and the first diode, and a second electrode connected to ground; The second resistor includes a first end connected to a power source and a second end connected to a first electrode of the first switch tube; The first diode includes an anode connected to the power source and the first electrode of the first switch tube, and a cathode connected to the controller.

8. The solid-state switch control device according to claim 5, characterized in that: The second identification circuit includes a third resistor, a second switch tube and a second diode; The second switch tube comprises a control electrode connected to the second identification terminal, a first electrode connected to the third resistor and the second diode, and a grounded second electrode; The third resistor comprises a first end connected to a power source and a second end connected to a first electrode of the second switch tube; The second diode includes an anode connected to the power source and the first electrode of the second switch tube, and a cathode connected to the controller.

9. The solid-state switch control device according to claim 1, characterized in that: It also includes a current monitoring module, which is connected in series with the mechanical switch and the electronic switch, and is used to sample the current of the main circuit to obtain a sampled current, and output a second control signal according to the sampled current to control the on and off of the electronic switch.

10. A solid-state switch control method, based on the solid-state switch control device according to any one of claims 1 to 9, characterized in that: include: According to the received status indication signal, determining whether the mechanical switch is in a closing completion state or an opening start state; If the mechanical switch is in a closing state, generating a first control signal of a first state to control the electronic switch to be turned on; If the mechanical switch is in the opening start state, a first control signal of a second state is generated to control the electronic switch to open.

11. The solid-state switch control method according to claim 10, characterized in that: The state indication signal includes a closing indication signal and an opening indication signal; The step of determining, according to the state indication signal, whether the mechanical switch is in a closing completion state or an opening start state comprises: In response to the opening indication signal, determining that the mechanical switch is in an opening start state; In response to the closing indication signal disappearing or the closing indication signal and the opening indication signal being alternately generated and then disappearing, it is determined that the mechanical switch is in a closing completion state.

12. A solid-state switch device, characterized in that: It comprises a solid-state switch electrical appliance control device as claimed in any one of claims 1 to 9.

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