Switching device

Abstract

The utility model provides a switching device, which is used for controlling a switch of a controlled circuit, and comprises an electromagnetic induction module which is arranged on the controlled circuit and can sense the change of an electric signal of the controlled circuit; the trigger circuit at least comprises a control switch linked with the electromagnetic induction module, and when the change of the electric signal of the controlled circuit exceeds a threshold value, the electromagnetic induction module drives the control switch to be closed; the switch module at least comprises a static contact, a moving contact and a gas generator used for controlling the matching state of the static contact and the moving contact, and the switch of the controlled circuit is controlled by the contact or separation of the static contact and the moving contact; and the gas generator is electrically connected with the control switch so as to control the static contact to be separated from the moving contact when the control switch is switched on, so that the controlled circuit is switched off. According to the utility model, the triggering time of the gas generator can be controlled within a plurality of milliseconds, and the triggering speed is high.

Description

Technical Field

[0001] The utility model relates to the technical field of switch devices, in particular to a switch device. Background Art

[0002] A contactor is a widely used switching device and also an electromagnetic driver. For example, it can be used to control the switching state of the high-voltage circuit of new energy vehicles. Its principle is to achieve the current switching at the high-voltage end by driving the moving contact and the static contact inside the contactor through the electromagnetic device / coil at the low-voltage end.

[0003] At present, there is a contactor with a gas generator on the market. The gas generator is also called a pyrotechnic trigger. The gas generator is located above the moving contact in the contactor. In actual use, when some abnormal conditions occur in the high-voltage circuit, such as abnormally large current, the conventional practice is to trigger the gas generator through the response of the BMS. After triggering, the gas generator will instantly generate high-pressure gas to push a piston component to disconnect the connection between the moving contact and the static contact in the contactor to disconnect the high-voltage circuit, thereby ensuring the safety of the vehicle's power system.

[0004] However, when an abnormally large current appears in the high-voltage circuit of a new energy vehicle, it is necessary to ensure that the gas generator is reliably triggered within a few milliseconds, thereby disconnecting the high-voltage circuit in time. The above-mentioned method of triggering the gas generator through the response of the BMS has a total triggering time of tens of milliseconds. The triggering speed is slow and cannot meet the application requirements of new energy vehicles. There is also a certain risk of false triggering, and the safety of the high-voltage circuit cannot be guaranteed. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a switching device, which aims to solve the technical problem that the entire triggering time of the gas generator through the response of the BMS in the prior art is tens of milliseconds, the triggering speed is slow, and there is a certain risk of false triggering, and it cannot meet the application requirements of reliably triggering the gas generator within a few milliseconds.

[0006] The purpose of the utility model is to provide a switch device for controlling the switch of a controlled circuit, the switch device comprising:

[0007] An electromagnetic induction module, arranged on the controlled circuit, capable of sensing changes in the electrical signal of the controlled circuit;

[0008] A trigger circuit at least includes a control switch linked to the electromagnetic induction module, and when the change of the electrical signal of the controlled circuit exceeds a threshold value, the electromagnetic induction module drives the control switch to close;

[0009] A switch module, comprising at least a stationary contact, a moving contact and a gas generator for controlling the matching state of the stationary contact and the moving contact, wherein the switch of the controlled circuit is controlled by the contact or separation of the stationary contact and the moving contact;

[0010] The gas generator is electrically connected to the control switch so as to control the static contact to separate from the moving contact when the control switch is closed, thereby disconnecting the controlled circuit.

[0011] The above-mentioned switch device triggers the gas generator in the switch module by setting an electromagnetic induction module and a trigger circuit, ensuring that the trigger time of the gas generator is controlled within a few milliseconds. The trigger speed is fast and the controlled circuit can be disconnected in time when an abnormal condition occurs in the controlled circuit. The main components such as the electromagnetic induction module and the control switch in the trigger circuit are all mechanical components, which can greatly reduce the risk of false triggering of the gas generator, thereby ensuring the safety of the controlled circuit.

[0012] In addition, the switch device according to the utility model may also have the following additional technical features:

[0013] Furthermore, a conductor is provided in series in the controlled circuit, and the electromagnetic induction module is arranged around the conductor.

[0014] Furthermore, the electromagnetic induction module includes a static yoke and a movable yoke adapted to the static yoke, wherein the static yoke is arranged around the conductor to sense changes in the electrical signal of the conductor;

[0015] One end of the moving yoke is linked to the control switch, and the other end of the moving yoke is arranged adjacent to the stationary yoke. When the change of the electrical signal of the conductor exceeds a threshold value, the stationary yoke controls the moving yoke to move toward the stationary yoke to drive the control switch to close, thereby turning on the trigger circuit.

[0016] Furthermore, when the control switch is in a normally open state, an air gap is provided between the stationary yoke and the movable yoke.

[0017] Furthermore, the static yoke is a U-shaped structure, the conductor passes through a groove of the U-shaped structure, and the moving yoke is arranged at an open end of the U-shaped structure. When the control switch is in a normally open state, the moving yoke is arranged in parallel with the open end of the U-shaped structure to form an air gap between the moving yoke and the static yoke.

[0018] Furthermore, the static yoke is a U-shaped structure, the conductor passes through a groove of the U-shaped structure, and the moving yoke is arranged at an open end of the U-shaped structure. When the control switch is in a normally open state, the moving yoke and the open end of the U-shaped structure are arranged at an angle to form an air gap between the moving yoke and the static yoke.

[0019] Furthermore, the trigger circuit also includes a power supply, and the power supply is connected in series with the control switch and the gas generator.

[0020] Furthermore, the gas generator includes a gas source and a piston, the gas source is electrically connected to the control switch, the piston is arranged at the outlet of the gas source, and the end of the piston away from the gas source is connected to the moving contact. When the control switch is closed, the gas source is triggered and generates a pushing gas, pushing the piston away from the gas source, and the piston drives the moving contact away from the static contact, thereby disconnecting the controlled circuit.

[0021] Furthermore, the switch module also includes an electromagnetic driver for resetting the contact state of the static contact and the moving contact, the electromagnetic driver includes a static iron core, a push rod, a moving iron core connected to the push rod, a coil arranged around the moving iron core, and a reset spring for connecting the static iron core and the moving iron core, and one end of the push rod away from the moving iron core is linked to the moving contact.

[0022] Furthermore, the control switch is a switch sheet structure, and the switch sheet structure includes a static switch sheet and a dynamic switch sheet, and the dynamic switch sheet is linked to one end of the dynamic yoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the principle of the switch device of the utility model in an untriggered state;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the switch module in the switch device of the utility model after being triggered.

[0025] Among them, the above-mentioned drawings include the following figure marks: 1-controlled circuit; 11-conductor; 2-electromagnetic induction module; 21-static yoke; 22-moving yoke; 3-switch module; 31-static contact; 32-moving contact; 33-gas generator; 331-gas source; 332-piston; 34-static iron core; 35-push rod; 36-moving iron core; 37-coil; 38-reset spring; 4-trigger circuit; 41-control switch; 42-power supply.

[0026] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figure 1 to Figure 2 The switch device of the utility model is used to control the switch of the controlled circuit 1. The switch device includes an electromagnetic induction module 2, a trigger circuit 4 and a switch module 3. The electromagnetic induction module 2 is arranged on the controlled circuit 1. The electromagnetic induction module 2 can sense the change of the electrical signal of the controlled circuit 1.

[0031] The trigger circuit 4 at least includes a control switch 41 linked to the electromagnetic induction module 2. When the change of the electrical signal of the controlled circuit 1 exceeds the threshold, the electromagnetic induction module 2 drives the control switch 41 to close.

[0032] The switch module 3 at least includes a stationary contact 31, a moving contact 32 and a gas generator 33 for controlling the matching state of the stationary contact 31 and the moving contact 32. The switch of the controlled circuit 1 is controlled by the contact or separation of the stationary contact 31 and the moving contact 32.

[0033] The gas generator 33 is electrically connected to the control switch 41 , so that when the control switch 41 is closed, the static contact 31 is controlled to be separated from the moving contact 32 , thereby disconnecting the controlled circuit 1 .

[0034] In this embodiment, the trigger circuit 4 also includes a power supply 42, which is connected in series with the control switch 41 and the gas generator 33. Under normal working conditions, the control switch 41 is in a normally open state, the trigger circuit 4 is in a disconnected state, and the gas generator 33 in the switch module 3 is in an untriggered state.

[0035] Furthermore, a conductor 11 is provided in series in the controlled circuit 1 , and the electromagnetic induction module 2 is arranged around the conductor 11 . The conductor 11 may be any conductive structure connected to the controlled circuit 1 .

[0036] The electromagnetic induction module 2 includes a stationary yoke 21 and a moving yoke 22 adapted to the stationary yoke 21. The stationary yoke 21 is arranged around the conductor 11 in the controlled circuit 1 to sense changes in the electrical signal of the conductor 11. Specifically, one end of the moving yoke 22 is linked to the control switch 41, and the other end of the moving yoke 22 is arranged adjacent to the stationary yoke 21. In a normal working state, an air gap is arranged between the stationary yoke 21 and the moving yoke 22. When current flows through the conductor 11, a magnetic field is generated around the conductor 11, and the static yoke 21 arranged around the conductor 11 is magnetized, so that the static yoke 21 has a certain magnetic field, and the moving yoke 22 is located in the magnetic field. When the current is larger, the magnetic field on the static yoke 21 is stronger, which drives the moving yoke 22 to move in the direction of the static yoke 21. In this process, the air gap between the moving yoke 22 and the static yoke 21 gradually decreases, and finally the moving yoke 22 is adsorbed on the static yoke 21. The moving yoke 22 drives the control switch 41 to close, the trigger circuit 4 is turned on, and the gas generator 33 is triggered.

[0037] Furthermore, the control switch 41 is a switch sheet structure, which includes a static switch sheet and a dynamic switch sheet. The dynamic switch sheet is linked to one end of the dynamic yoke 22. When the dynamic yoke 22 moves toward the direction of the static yoke 21, the dynamic yoke 22 will drive the dynamic switch sheet to be in conductive contact with the static switch sheet, thereby realizing the closing of the control switch 41.

[0038] That is to say, the closing of the trigger circuit 4 is controlled by the electromagnetic induction module 2, thereby controlling the trigger state of the gas generator 33. When the change of the electrical signal on the conductor 11 in the controlled circuit 1 exceeds the threshold, the electromagnetic induction module 2 responds and drives the control switch 41 to close to turn on the trigger circuit 4, thereby triggering the gas generator 33. Therefore, the gas generator 33 of the utility model can be controlled to be triggered reliably within a few milliseconds, and the triggering speed is fast. When an abnormal condition occurs in the controlled circuit 1, the controlled circuit 1 can be disconnected in time. The main components such as the electromagnetic induction module and the control switch 41 in the trigger circuit 4 are all mechanical components, which can greatly reduce the risk of false triggering of the gas generator 33, thereby ensuring the safety of the controlled circuit 1.

[0039] As a specific example, in this embodiment, the stationary yoke 21 is a U-shaped structure, the conductor 11 passes through the groove of the U-shaped structure, and the moving yoke 22 is arranged at the open end of the U-shaped structure. When the control switch 41 is in the normally open state, the moving yoke 22 is arranged in parallel with the open end of the U-shaped structure to form an air gap between the moving yoke 22 and the stationary yoke 21. It should be noted that an elastic member can be provided in the electromagnetic induction module 2 to limit the initial position of the moving yoke 22 to stably support the moving yoke 22 in the initial state. When the moving yoke 22 moves in the direction of the stationary yoke 21, the moving yoke 22 will overcome the supporting force of the elastic member on it and achieve attraction with the stationary yoke 21.

[0040] In some embodiments, the stationary yoke 21 is a U-shaped structure, the conductor 11 passes through the groove of the U-shaped structure, and the moving yoke 22 is arranged at the open end of the U-shaped structure. When the control switch 41 is in the normally open state, the moving yoke 22 and the open end of the U-shaped structure are set at an angle to form an air gap between the moving yoke 22 and the stationary yoke 21.

[0041] As a specific example, in this embodiment, if Figure 2 As shown, the switch module 3 includes two static contacts 31 and one moving contact 32. The moving contact 32 is arranged below the two static contacts 31. The ends of the two static contacts 31 away from the moving contact 32 are respectively connected to the controlled circuit 1. In the normal working state, that is, when the gas generator 33 is not triggered, the moving contact 32 is in contact with the two static contacts 31 at the same time. The gas generator 33 is provided between the two stationary contacts 31. Specifically, the gas generator 33 includes a gas source 331 and a piston 332. The gas source 331 is provided with a pin, and the gas generator 33 is electrically connected to the control switch 41 in the trigger circuit 4 through the pin. The piston 332 is provided at the gas outlet of the gas source 331. The end of the piston 332 away from the gas source 331 is connected to the moving contact 32. When the control switch 41 is closed, the gas source 331 is triggered and generates a driving gas, which drives the piston 332 away from the gas source 331, and the piston 332 moves downward. In this process, the piston 332 will drive the moving contact 32 away from the stationary contact 31, and the moving contact 32 will no longer contact the stationary contact 31, thereby disconnecting the controlled circuit 1. It should be noted that in the process of the piston 332 driving the moving contact 32 away from the stationary contact 31, the driving gas generated by the gas source 331 will be extremely quickly and evenly diffused in the inner cavity of the shell.

[0042] Furthermore, the switch module 3 further includes an electromagnetic driver for resetting the contact state of the static contact 31 and the moving contact 32, the electromagnetic driver including a static iron core 34, a push rod 35, a moving iron core 36 connected to the push rod 35, a coil 37 arranged around the moving iron core 36, and a reset spring 38 for connecting the static iron core 34 and the moving iron core 36, and one end of the push rod 35 away from the moving iron core 36 is linked to the moving contact 32. Among them, one end of the reset spring 38 is fixedly connected to the static iron core 34, and the other end of the reset spring 38 is fixedly connected to the moving iron core 36. Under normal working conditions, the coil 37 is energized, the static iron core 34 will attract the moving iron core to move upward, causing the push rod 35 to push the moving contact 32 upward in the direction of the static contact 31, so that the moving contact 32 is in contact with the static contact 31. At this time, the return spring 38 provided between the static iron core 34 and the moving iron core 36 is in a compressed state, and the return spring 38 generates a reaction force on the moving iron core 36 that can push the moving iron core 36 away from the static iron core 34; and when the coil 37 is in a power-off state, the static iron core 34 no longer generates an attractive force on the moving iron core 36, and the moving iron core 36 will move downward under the reaction force of the return spring 38, and the push rod 35 connected to the moving iron core 36 will drive the moving contact 32 to move downward at the same time, so that the moving contact 32 is separated from the static contact 31.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A switch device, characterized in that: A switch for controlling a controlled circuit, the switch device comprising: An electromagnetic induction module, arranged on the controlled circuit, capable of sensing changes in the electrical signal of the controlled circuit; A trigger circuit at least includes a control switch linked to the electromagnetic induction module, and when the change of the electrical signal of the controlled circuit exceeds a threshold value, the electromagnetic induction module drives the control switch to close; A switch module, comprising at least a stationary contact, a moving contact and a gas generator for controlling the matching state of the stationary contact and the moving contact, wherein the switch of the controlled circuit is controlled by the contact or separation of the stationary contact and the moving contact; The gas generator is electrically connected to the control switch so as to control the static contact to separate from the moving contact when the control switch is closed, thereby disconnecting the controlled circuit.

2. The switch device according to claim 1, characterized in that: A conductor is arranged in series in the controlled circuit, and the electromagnetic induction module is arranged around the conductor.

3. The switch device according to claim 2, characterized in that: The electromagnetic induction module includes a static yoke and a movable yoke adapted to the static yoke, wherein the static yoke is arranged around the conductor and is used to sense changes in the electrical signal of the conductor; One end of the moving yoke is linked to the control switch, and the other end of the moving yoke is arranged adjacent to the stationary yoke. When the change of the electrical signal of the conductor exceeds a threshold value, the stationary yoke controls the moving yoke to move toward the stationary yoke to drive the control switch to close, thereby turning on the trigger circuit.

4. The switch device according to claim 3, characterized in that: When the control switch is in a normally open state, an air gap is provided between the static yoke and the movable yoke.

5. The switch device according to claim 4, characterized in that: The static yoke is a U-shaped structure, the conductor passes through the groove of the U-shaped structure, and the moving yoke is arranged at the open end of the U-shaped structure. When the control switch is in a normally open state, the moving yoke is arranged in parallel with the open end of the U-shaped structure to form an air gap between the moving yoke and the static yoke.

6. The switch device according to claim 4, characterized in that: The static yoke is a U-shaped structure, the conductor passes through the groove of the U-shaped structure, and the moving yoke is arranged at the open end of the U-shaped structure. When the control switch is in a normally open state, the moving yoke and the open end of the U-shaped structure are arranged at an angle to form an air gap between the moving yoke and the static yoke.

7. The switch device according to claim 1, characterized in that: The trigger circuit also includes a power supply, which is connected in series with the control switch and the gas generator.

8. The switch device according to claim 1, characterized in that: The gas generator includes a gas source and a piston. The gas source is electrically connected to the control switch. The piston is arranged at the gas outlet of the gas source. The end of the piston away from the gas source is connected to the moving contact. When the control switch is closed, the gas source is triggered and generates a pushing gas, which pushes the piston away from the gas source. The piston drives the moving contact away from the static contact, thereby disconnecting the controlled circuit.

9. The switch device according to claim 1, characterized in that: The switch module also includes an electromagnetic driver for resetting the contact state of the static contact and the moving contact, the electromagnetic driver includes a static iron core, a push rod, a moving iron core connected to the push rod, a coil arranged around the moving iron core, and a reset spring for connecting the static iron core and the moving iron core, and one end of the push rod away from the moving iron core is linked to the moving contact.

10. The switch device according to claim 3, characterized in that: The control switch is a switch sheet structure, which includes a static switch sheet and a dynamic switch sheet, and the dynamic switch sheet is linked with one end of the dynamic yoke.

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