Solid state circuit breaker

Abstract

The invention discloses a solid-state circuit breaker which comprises an electronic switch and a mechanical switch which are connected in series. The handle is rotatably mounted on the shell and can stop at a switching-on position, an energy storage position and a switching-off position between the switching-on position and the energy storage position; a moving contact and a static contact, the moving contact being configured to be capable of moving between an open position and a closed position, the moving contact being not in contact with the static contact at the open position, and the moving contact being in contact with the static contact at the closed position; the transmission assembly is configured to transmit the motion of the handle to the moving contact so as to realize contact and separation with the static contact, and when the handle is located at the closing position, the mechanical switch is closed; when the handle is in the opening position, the mechanical switch is switched off, and the transmission assembly is in a tripping state. When the handle is located at the energy storage position, the mechanical switch is switched off, and the transmission assembly is in a non-tripping state.

Description

Technical Field

[0001] The invention relates to a solid-state circuit breaker. Background Art

[0002] Solid-state circuit breakers use the principles of electronic components to control the opening and closing of circuits. They are suitable for various AC and DC applications because of their advantages such as short breaking time, no arcing during breaking, long electrical life, and no noise.

[0003] Solid-state circuit breakers include an electronic switch and a mechanical switch connected in series. How to design a mechanical switch to meet the requirements of a solid-state circuit breaker is a difficult problem in the industry. Summary of the invention

[0004] In response to at least one of the above problems, a solid-state circuit breaker is proposed, comprising an electronic switch and a mechanical switch connected in series, wherein the mechanical switch comprises: a housing; a handle rotatably mounted to the housing and capable of being parked in a closing position, an energy storing position, and an opening position between the closing position and the energy storing position; a moving contact and a stationary contact, wherein the moving contact is configured to be able to move between an opening position and a closing position, wherein the moving contact is not in contact with the stationary contact in the opening position, and wherein the moving contact is in contact with the stationary contact in the closing position; and a transmission assembly configured to transmit the movement of the handle to the moving contact to achieve contact and separation with the stationary contact, wherein when the handle is in the closing position, the mechanical switch is closed; when the handle is in the opening position, the mechanical switch is opened, and the transmission assembly is in a tripped state; when the handle is in the energy storing position, the mechanical switch is opened, and the transmission assembly is in a non-tripped state.

[0005] Regardless of manual or electric opening, the handle of the solid-state circuit breaker according to the present invention will stop at the opening position, and when the trip is released after the opening, the handle will stop at the energy storage position, and after the closing is completed, the handle will stop at the closing position, so that the handle position can clearly indicate the state of the mechanical switch.

[0006] The solid-state circuit breaker according to the present invention may have one or more of the following features.

[0007] According to one embodiment, the solid-state circuit breaker further comprises an energy storage micro switch mounted to the housing and configured to be actuated when the handle is rotated to the energy storage position and released when the handle leaves the energy storage position, so that the energy storage position can be electronically captured.

[0008] According to one embodiment, the mechanical switch includes an energy storage micro-actuator, and the movement of the handle drives the energy storage micro-actuator to move. The energy storage micro-switch is arranged near the end point of the movement path of the energy storage micro-actuator during the movement of the handle toward the energy storage position, so that when the handle moves to the energy storage position, the energy storage micro-actuator is driven by the handle and actuates the energy storage micro-switch to the energy storage micro-switch closed state, and when the handle leaves the energy storage position, the energy storage micro-actuator is driven by the handle and releases the energy storage micro-switch to the energy storage micro-switch open state.

[0009] According to one embodiment, the solid-state circuit breaker further includes: a handle microswitch, mounted on the housing, and configured to be actuated when the handle is rotated to the closing position and released when the handle leaves the closing position, so that when the handle is in the closing position, the handle microswitch is in a handle micro-movement closing state, and when the handle leaves the closing position by a certain stroke, the handle microswitch is in a handle micro-movement opening state; a contact microswitch, mounted on the housing, and configured to be actuated when the moving contact moves to the closing position and released when the moving contact leaves the closing position, so that when the moving contact is in the closing position, the contact microswitch is in a contact micro-movement closing state, and when the moving contact leaves the closing position, the contact microswitch is in a contact micro-movement opening state, wherein, by detecting the states of the handle microswitch and the contact microswitch, when the solid-state circuit breaker changes from opening to closing, the mechanical switch is closed first and the electronic switch is closed later, and when the solid-state circuit breaker changes from closing to opening, the electronic switch is opened first and the mechanical switch is opened later.

[0010] According to one embodiment, the transmission assembly includes a contact micro-actuator, and the contact micro-switch is arranged near the end point of the movement path of the contact micro-actuator during the closing process, so that when the transmission assembly drives the moving contact to the closed position, the contact micro-actuator actuates the contact micro-switch to the contact micro-movement closing state, and when the transmission assembly drives the moving contact to leave the closed position, the contact micro-motion actuator releases the contact micro-switch to the contact micro-movement opening state.

[0011] According to one embodiment, the mechanical switch includes a handle micro-actuator, and the movement of the handle drives the handle micro-actuator to move. The handle micro-switch is arranged near the end point of the movement path of the handle micro-actuator during the closing process, so that when the handle moves to the closing position, the handle micro-actuator is driven by the handle and actuates the handle micro-switch to the handle micro-closing state, and when the handle leaves the closing position, the handle micro-actuator is driven by the handle and releases the handle micro-switch to the handle micro-opening state.

[0012] According to one embodiment, in the case of manual closing: the handle is manually rotated from the energy storage position toward the closing position, and the movement of the handle is transmitted to the moving contact through the transmission assembly, so that the moving contact moves from the open position toward the closed position. When the moving contact reaches the closed position, the contact microswitch is actuated to the contact micro-movement closed state, and the mechanical switch is closed. At the same time, when the handle moves to the closing position, the handle microswitch is actuated to the handle micro-movement closed state. At this time, the solid-state circuit breaker reaches the hot standby state. When the solid-state circuit breaker is in the hot standby state, if the electronic switch is closed, the solid-state circuit breaker is closed.

[0013] According to one embodiment, the solid-state circuit breaker further comprises a trip unit configured to be tripped when electronically driven, so that the transmission assembly is actuated to switch the moving contact from the closed position to the open position and to switch the handle from the closed position to the open position.

[0014] According to one embodiment, the tripping unit includes: an electromagnet, configured to operate when energized; and a tripping rod, which is pushed by the electromagnet when the electromagnet operates, so that the transmission assembly can quickly open the moving contact and switch the handle to the opening position under the action of a main spring connected between the handle and the transmission assembly.

[0015] According to one embodiment, in the case of electric opening: the electronic switch opens, and then the trip unit is electronically driven, the transmission assembly is actuated to move the moving contact from the closed position toward the open position, when the moving contact leaves the closed position, the contact microswitch is released to the contact micromovement open state, when the moving contact reaches the open position, the mechanical switch opens, the solid-state circuit breaker opens, and at the same time, the transmission assembly is actuated to move the handle from the closed position toward the open position, when the handle leaves the closed position, the handle microswitch is released to the handle micromovement open state, and the handle finally stops at the open position.

[0016] According to one embodiment, in the case of manual opening: the handle is manually rotated from the closing position toward the opening position, when the handle leaves the closing position, the handle microswitch is released to the handle microopening state, at this time, in response to the handle microopening state of the handle microswitch, the electronic switch is opened, and then the electronic drive trip unit is actuated, the transmission assembly is actuated to move the moving contact from the closed position toward the opening position, when the moving contact leaves the closed position, the contact microswitch is released to the contact microopening state, when the moving contact reaches the opening position, the mechanical switch is opened, thereby the solid-state circuit breaker is opened, and the handle is parked in the opening position.

[0017] According to one embodiment, in the case of manual opening when the electromagnet fails: the handle is manually rotated from the closing position, and when the handle leaves the closing position, the handle microswitch is released to the handle microopening state, at which time the electronic switch is opened in response to the handle microopening state of the handle microswitch, but the trip unit cannot trip due to the failure of the electromagnet, and the handle cannot be parked in the opening position, and is further rotated to the energy storage position, thereby manually making the moving contact reach the disconnecting position, the mechanical switch is opened, and thus the solid-state circuit breaker is opened, and the handle is parked in the energy storage position.

[0018] According to one embodiment, the handle cannot stop at the open position in the case of manual opening, indicating that the electromagnet has failed.

[0019] According to one embodiment, a solid-state circuit breaker includes a plurality of breaking units and a transmission linkage configured to synchronize the plurality of breaking units, the transmission linkage being connected to the plurality of breaking units and configured to link movable contacts of the plurality of breaking units. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. The drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto. Moreover, in order to show the components that need to be shown, some components are hidden in some figures.

[0021] Figure 1 It is a front view of the appearance view of the solid-state circuit breaker according to the present invention and a side view showing the handle position, wherein (a) the handle is in the closing position, (b) the handle is in the opening position, and (c) the handle is in the energy storage position.

[0022] Figure 2 is an enlarged view showing the handle position of a solid-state circuit breaker.

[0023] Figure 3 is a side view showing a mechanical switch of a solid-state circuit breaker according to the present invention.

[0024] Figure 4 1 is a block diagram showing a mechanical switch of a solid-state circuit breaker according to the present invention.

[0025] Figure 5 1 is a top view showing the structure of a mechanical switch of a solid-state circuit breaker according to the present invention.

[0026] Figure 6 is a perspective view showing the position of an energy storage microswitch of a solid-state circuit breaker according to the present invention.

[0027] Figure 7is a perspective view showing the position of a handle micro switch of a solid-state circuit breaker according to the present invention.

[0028] Figure 8 is a perspective view showing the position of a contact microswitch of a solid-state circuit breaker according to the present invention.

[0029] Fig. 9 is a perspective view showing a trip unit of a solid-state circuit breaker according to the present invention.

[0030] Reference numerals list

[0031] 2 Handles

[0032] 3 Stationary contacts

[0033] 4 Moving contact

[0034] 5 Transmission components

[0035] 6 Energy storage micro switch

[0036] 61 Energy storage micro-motion linkage

[0037] 62 Handle side panel

[0038] 7 Handle micro switch

[0039] 71 Handle micro-actuator

[0040] 8-contact micro switch

[0041] 81 Contact micro-movement linkage

[0042] 82 Spindle

[0043] 91 Electromagnet

[0044] 92 Release lever

[0045] 10 Disconnection unit

[0046] 11 Transmission linkage DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] The present invention will be described in detail below by way of describing exemplary embodiments.

[0050] The solid-state circuit breaker according to the present invention comprises an electronic switch and a mechanical switch connected in series, and a heat dissipation module. The electronic switch is also called a semiconductor switch, and the opening and closing of the electronic switch can be controlled by receiving an electrical signal. The mechanical switch can realize the mechanical separation and closing of the circuit, provide a mechanical separation and closing indication, and the state of the mechanical switch can be transmitted to the electronic switch.

[0051] like Figure 3 As shown, the mechanical switch may include: a housing; a handle 2, which is rotatably mounted to the housing and can be parked in a closed position (ON, Figure 1 The position shown in (a) Figure 2 Position A in which the mechanical switch is closed), energy storage position (Charged, Figure 1 The position shown in (c) Figure 2 position C, at which the mechanical switch is open and the transmission assembly is in a non-tripped state), and the open position (OFF, Figure 1 The position shown in (b) Figure 2 Position B in the middle, at which time the mechanical switch is open and the transmission assembly is in a tripped state); a moving contact 4 and a stationary contact 3, the moving contact 4 is configured to be able to move between an open position and a closed position, in the open position, the moving contact 4 is not in contact with the stationary contact 3, and in the closed position, the moving contact 4 is in contact with the stationary contact 3; a transmission assembly 5, configured to transmit the movement of the handle 2 to the moving contact 4 to achieve contact and separation with the stationary contact 3; and a main spring (not shown), connected between the handle 2 and the transmission assembly 5.

[0052] The mechanical switch of the solid-state circuit breaker according to the present invention adopts the four-bar linkage of the conventional molded case circuit breaker for transmission. Therefore, the transmission process of the transmission assembly 5, the main spring, the moving contact 4, etc. will not be described in detail. However, under normal circumstances, whether it is manual opening or electric opening, the handle 2 according to the present invention will stop at Figure 2 The switch-off position B shown in the figure is different from the traditional four-bar mechanism where the manual switch-off stops at position C and the electric switch-off stops at position B, thereby solving the problem of confusing switch-off position indication.

[0053] Figure 4 1 is a block diagram showing a mechanical switch of a solid-state circuit breaker according to the present invention. Figure 5 1 is a top view showing the structure of a mechanical switch of a solid-state circuit breaker according to the present invention. Figure 4 and Figure 5 The mechanical switch of the solid-state circuit breaker according to one embodiment of the present invention may further include an energy storage micro switch 6, a handle micro switch 7 and a contact micro switch 8. The energy storage micro switch 6, the handle micro switch 7 and the contact micro switch 8 are respectively installed in the housing and configured in appropriate positions according to their functions.

[0054] The energy storage micro switch 6 is configured to be actuated when the handle 2 rotates to the energy storage position and to be released when the handle 2 leaves the energy storage position, so that the energy storage position of the handle 2 can be captured electronically. Specifically, the mechanical switch may include an energy storage micro actuator, and the movement of the handle 2 drives the energy storage micro actuator to move. The energy storage micro switch is arranged near the end point of the movement path of the energy storage micro actuator during the movement of the handle toward the energy storage position, so that when the handle 2 moves to the energy storage position, the energy storage micro actuator is driven by the handle 2 and actuates the energy storage micro switch 6 to the energy storage micro closed state, and when the handle 2 leaves the energy storage position, the energy storage micro actuator is driven by the handle 2 and releases the energy storage micro switch 6 to the energy storage micro open state. Figure 6 In the embodiment, the energy storage micro-motion actuator includes an energy storage micro-motion linkage 61 and a handle side plate 62. The energy storage micro-motion linkage 61 is rotatably mounted to the housing, and the handle side plate 62 moves synchronously with the handle 2. When the handle 2 is close to the closing position, the handle side plate 62 abuts against the energy storage micro-motion linkage 61 and drives the energy storage micro-motion linkage 61 to rotate, so that the energy storage micro-motion linkage 61 actuates the energy storage micro-motion switch 6 to the energy storage micro-motion closing state. When the handle 2 leaves the closing position, the handle side plate 62 moves away from the energy storage micro-motion linkage 61, and the energy storage micro-motion linkage 61 resets and releases the energy storage micro-motion switch 6 to the energy storage micro-motion opening state. By setting the energy storage micro-motion switch 6, it is convenient to detect whether the handle 2 is in the energy storage position, so as to control the solid-state circuit breaker according to whether the handle 2 is in the energy storage position (that is, whether the transmission assembly 5 is in the tripping position). For example, the energy storage position can be electronically captured to distinguish the opening position and the energy storage position of the handle, so as to facilitate the expansion of the automatic closing function in the future.

[0055] The handle micro switch 7 is configured to be actuated when the handle 2 rotates to the closing position and to be released when the handle 2 leaves the closing position, so that when the handle 2 is in the closing position, the handle micro switch 7 is in the handle micro closed state, and when the handle 2 leaves the closing position for a certain distance, the handle micro switch 7 is in the handle micro open state. Specifically, the handle micro actuator 71 configured to actuate and release the handle micro switch 7 can be provided on the handle 2 or on the transmission assembly 5. The movement of the handle 2 between the closing position and the open position drives the handle micro actuator 71 to move, and the handle micro switch 7 is provided near the end point of the movement path of the handle micro actuator 71 during the closing process, so that when the handle 2 moves to the closing position, the handle micro actuator 71 is driven by the handle 2 and actuates the handle micro switch 7 to the handle micro closed state, and when the handle 2 leaves the closing position, the handle micro actuator 71 is driven by the handle 2 and releases the handle micro switch 7 to the handle micro open state. Figure 7 In the embodiment of the present invention, the handle micro-actuating member 71 is an actuating protrusion protruding from the handle side plate. By providing the handle micro-switch 7, it is convenient to detect whether the handle 2 is in the closing position, thereby controlling the solid-state circuit breaker according to whether the handle 2 is in the closing position.

[0056] The contact microswitch 8 is configured to be actuated when the moving contact 4 moves to the closed position and to be released when the moving contact 4 leaves the closed position, so that when the moving contact 4 is in the closed position, the contact microswitch 8 is in the contact microswitch closed state, and when the moving contact 4 leaves the closed position, the contact microswitch 8 is in the contact microswitch open state. Specifically, the transmission assembly 5 may include a contact microswitch actuator configured to actuate and release the contact microswitch 8. For example, the contact microswitch 8 is disposed near the end point on the movement path of the contact microswitch actuator during the closing process, so that when the transmission assembly 5 drives the moving contact 4 to move to the closed position, the contact microswitch actuator actuates the contact microswitch 8 to the contact microswitch closed state, and when the transmission assembly 5 drives the moving contact 4 to leave the closed position, the contact microswitch actuator releases the contact microswitch 8 to the contact microswitch open state. Figure 8 In the embodiment of the present invention, the contact micro-motion actuator may be a contact micro-motion linkage member 81 connected to a main shaft 82, and the main shaft 82 moves with the moving contact, thereby driving the contact micro-motion linkage member 81 to move, so as to actuate and release the contact micro-switch 8. By providing the contact micro-switch 8, it is convenient to detect whether the moving contact 4 is in the closed position, thereby controlling the solid-state circuit breaker according to whether the moving contact 4 is in the closed position (i.e., whether the mechanical switch is in the closed state).

[0057] By adding the handle micro switch 7 and the contact micro switch 8, the state of the handle 2 and the state of the moving contact 4 can be conveniently detected, and the solid-state circuit breaker can be conveniently controlled to achieve that when the solid-state circuit breaker changes from open to closed, the mechanical switch is closed first and the electronic switch is closed later, and when the solid-state circuit breaker changes from closed to open, the electronic switch is opened first and the mechanical switch is opened later.

[0058] The solid-state circuit breaker according to the present invention may further include a tripping unit, which is configured to be tripped when electronically driven, so that the transmission assembly 5 is actuated to a tripping state, so that the moving contact 4 is switched from the closed position to the open position and the handle 2 is switched from the closed position to the open position. In other words, the solid-state circuit breaker according to the present invention may have an electronically driven tripping function, and the tripping is performed by electrical signal control. Specifically, refer to Fig. 9 The electronically driven tripping unit may include an electromagnet 91 and a tripping rod 92. The moving contact moves when energized and pushes the tripping rod 92, triggering the tripping, so that the transmission assembly 5 can quickly open the moving contact 4 under the action of the main spring and switch the handle 2 to the opening position. Since the electromagnet 91 pushes the tripping rod 92 during the tripping, the four-bar linkage of the transmission assembly is changed to a five-bar linkage, and the energy of the main spring is utilized, so that the moving contact 4 can be opened instantly while ensuring a smaller tripping force, which facilitates the selection of an electromagnet 91 with lower power consumption. When the transmission assembly 5 is in the tripping state, the closing operation cannot be performed, and the transmission assembly 5 needs to be restored to the non-tripping state before closing. Specifically, when the handle 2 is actuated from the opening position to the energy storage position, the transmission assembly 5 is restored from the tripping state to the non-tripping state.

[0059] The solid-state circuit breaker according to the present invention may have multiple stages. When having multiple stages, the solid-state circuit breaker may include multiple breaking units 10 and a transmission linkage 11 configured to synchronize the multiple breaking units 10, the transmission linkage 11 being connected to the multiple breaking units 10 and configured to synchronize the moving contacts 4 of the multiple breaking units 10. Specifically, Figure 4 As shown, the transmission linkage 11 may be a connecting shaft connected to a plurality of disconnecting units 10 .

[0060] Return to Figure 4 and Figure 5 The electromagnet 91 of the mechanical switch of the solid-state circuit breaker according to the present invention can be arranged on one side of the transmission assembly 5, and the three micro switches can be installed from three directions. The whole layout and design are particularly compact.

[0061] In addition, through the design of the mechanical switch, it can be achieved that the maximum rated current that the mechanical breakpoint can withstand can be 160A while meeting the UL standard (can be connected and disconnected 3 times at 6 times the In current).

[0062] The following describes the logic design of various state conversions of the solid-state circuit breaker according to the present invention. It should be noted that, since the mechanical switch and the electronic switch of the solid-state circuit breaker are connected in series, when the mechanical switch and the electronic switch are both in the closed state, the solid-state circuit breaker is in the closed state; when the mechanical switch and the electronic switch are both in the open state, the solid-state circuit breaker is in the open state; when the mechanical switch is in the closed state and the electronic switch is in the open state, the solid-state circuit breaker is in the hot standby state. When the solid-state circuit breaker is in the hot standby state, as long as the electronic switch is closed by an electrical signal, the solid-state circuit breaker enters the closed state. Further, according to the present invention, when the solid-state circuit breaker is in the closed state, the handle 2 is in the closed position; when the solid-state circuit breaker is in the open state, if the transmission assembly is in the tripped state, the handle 2 is in the open position, and if the transmission assembly is in the non-tripped state, the handle 2 is in the energy storage position.

[0063] In the case of manual closing: manually rotate the handle 2 from the energy storage position to the closing position, the movement of the handle 2 is transmitted to the moving contact through the transmission assembly 5, so that the moving contact 4 moves from the open position to the closed position. When the moving contact 4 reaches the closed position, the contact micro switch 8 is actuated to the contact micro closed state, and the mechanical switch is closed. At the same time, when the handle 2 moves to the closing position, the handle micro switch 7 is actuated to the handle micro closed state. At this time, the solid-state circuit breaker reaches the hot standby state. If the electronic switch is closed, the solid-state circuit breaker is closed.

[0064] In the case of electric opening: the electronic switch opens, and then the electronically driven trip unit is driven, and the transmission assembly 5 is actuated under the action of the main spring to move the moving contact 4 from the closed position toward the open position. When the moving contact 4 leaves the closed position, the contact microswitch 8 is released to the contact micromovement open state. When the moving contact 4 reaches the open position, the mechanical switch opens, and the solid-state circuit breaker opens. At the same time, the transmission assembly 5 is actuated to move the handle 2 from the closed position toward the open position. When the handle 2 leaves the closed position, the handle microswitch 7 is released to the handle micromovement open state, and the handle 2 finally stops at the open position.

[0065] In the case of manual opening: manually rotate the handle 2 from the closing position toward the opening position. When the handle 2 leaves the closing position, the handle microswitch 7 is released to the handle micro-opening state. At this time, in response to the handle micro-opening state of the handle micro-switch 7, the electronic switch is opened, and then the electronic drive trip unit is driven. The transmission assembly 5 is actuated under the action of the main spring to move the moving contact 4 from the closing position toward the opening position. When the moving contact 4 leaves the closing position, the contact micro-switch 8 is released to the contact micro-opening state. When the moving contact 4 reaches the opening position, the mechanical switch is opened, thereby the solid-state circuit breaker is opened, and the handle is parked in the opening position.

[0066] It should be noted that in the case of manual opening, although when the handle 2 is manually rotated from the closing position to the opening position, in theory the handle 2 drives the transmission assembly 5 and thus drives the moving contact 4 to move toward the disconnected position, but since the handle microswitch in the open state triggers the electronic switch to open, and then triggers the electronically driven tripping unit, and the electronic tripping is usually faster than the mechanical transmission, the driving force of the transmission assembly 6 and the moving contact 4 from closing to opening comes from the electronically driven tripping unit, rather than from the drive of the handle 2. In addition, since the handle 2 can release the handle microswitch 7 when it leaves the closing position, and then triggers the electronic tripping to make the moving contact 4 reach the disconnected position, even if the operator regrets or the handle 2 is stuck in the process of manually rotating the handle 2 from the closing position to the opening position, the mechanical switch of the solid-state circuit breaker will be electronically driven to the open state, thereby ensuring the safety of the circuit.

[0067] In particular, in the case of manual opening when the electromagnet 91 fails: manually rotate the handle 2 from the closing position, when the handle 2 leaves the closing position, the handle microswitch 7 is released to the handle microopening state, at this time, in response to the handle microopening state of the handle microswitch, the electronic switch is open, but the trip unit cannot trip due to the failure of the electromagnet 91, and the handle 2 cannot be parked in the opening position, and then needs to be further rotated to the energy storage position, so that the moving contact 4 is manually made to reach the disconnecting position, the mechanical switch is open, and thus the solid-state circuit breaker is open, and the handle is parked in the energy storage position.

[0068] It should be noted that the dead point of the main spring is between the opening position and the energy storage position. When the electromagnet 91 fails, if the user only actuates the handle 2 to the opening position, the handle 2 will return to the closing position under the action of the main spring and cannot stop at the opening position. Therefore, manual opening can only actuate the handle 2 to the energy storage position. Then, if the handle 2 cannot stop at the opening position in the case of manual opening, it indicates to the user that the electromagnet 91 fails.

[0069] The exemplary implementation of the solid-state circuit breaker proposed in the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the protection scope of the present invention.

Claims

1. A solid-state circuit breaker, comprising an electronic switch and a mechanical switch connected in series, wherein the mechanical switch comprises: case; A handle is rotatably mounted to the housing and can be parked in a closing position, an energy storing position, and an opening position between the closing position and the energy storing position; A movable contact and a stationary contact, wherein the movable contact is configured to be movable between an open position and a closed position, wherein the movable contact is not in contact with the stationary contact in the open position and the movable contact is in contact with the stationary contact in the closed position; as well as A transmission assembly configured to transmit the movement of the handle to the moving contact to achieve contact and separation with the stationary contact; Wherein, when the handle is in the closing position, the mechanical switch is closed; when the handle is in the opening position, the mechanical switch is opened, and the transmission component is in a tripped state; when the handle is in the energy storage position, the mechanical switch is opened, and the transmission component is in a non-tripped state.

2. The solid-state circuit breaker according to claim 1, wherein: The solid-state circuit breaker also includes a charging microswitch mounted to the housing and configured to be actuated when the handle is rotated to the charging position and released when the handle leaves the charging position, so that the charging position can be electronically captured.

3. The solid-state circuit breaker according to claim 2, wherein: The mechanical switch includes an energy storage micro-actuator, and the movement of the handle drives the energy storage micro-actuator to move. The energy storage micro-switch is arranged near the end point of the movement path of the energy storage micro-actuator during the movement of the handle toward the energy storage position, so that when the handle moves to the energy storage position, the energy storage micro-actuator is driven by the handle and actuates the energy storage micro-switch to the energy storage micro-switch closed state, and when the handle leaves the energy storage position, the energy storage micro-actuator is driven by the handle and releases the energy storage micro-switch to the energy storage micro-switch open state.

4. The solid-state circuit breaker according to claim 2, further comprising: A handle micro switch is mounted on the housing and is configured to be actuated when the handle is rotated to the closing position and released when the handle leaves the closing position, so that when the handle is in the closing position, the handle micro switch is in a handle micro closed state, and when the handle leaves the closing position by a certain stroke, the handle micro switch is in a handle micro open state; A contact micro switch is mounted to the housing and is configured to be actuated when the moving contact moves to the closed position and released when the moving contact leaves the closed position, so that when the moving contact is in the closed position, the contact micro switch is in a contact micro closed state, and when the moving contact leaves the closed position, the contact micro switch is in a contact micro open state. Among them, by detecting the status of the handle micro switch and the contact micro switch, when the solid-state circuit breaker changes from open to closed, the mechanical switch closes first and the electronic switch closes later, and when the solid-state circuit breaker changes from closed to open, the electronic switch opens first and the mechanical switch opens later.

5. The solid-state circuit breaker according to claim 4, wherein: The transmission assembly includes a contact micro-actuating member, and the contact micro-switch is arranged near the end point of the movement path of the contact micro-actuating member during the closing process, so that when the transmission assembly drives the moving contact to the closed position, the contact micro-actuating member actuates the contact micro-switch to the contact micro-movement closing state, and when the transmission assembly drives the moving contact to leave the closed position, the contact micro-motion actuator releases the contact micro-switch to the contact micro-movement opening state.

6. The solid-state circuit breaker according to claim 4, wherein: The mechanical switch includes a handle micro-actuator, and the movement of the handle drives the handle micro-actuator to move. The handle micro-switch is arranged near the end point of the movement path of the handle micro-actuator during the closing process, so that when the handle moves to the closing position, the handle micro-actuator is driven by the handle and actuates the handle micro-switch to the handle micro-closing state, and when the handle leaves the closing position, the handle micro-actuator is driven by the handle and releases the handle micro-switch to the handle micro-opening state.

7. The solid-state circuit breaker according to any one of claims 4 to 6, wherein: In case of manual closing: Manually rotate the handle from the energy storage position toward the closing position, and the movement of the handle is transmitted to the moving contact through the transmission assembly, so that the moving contact moves from the disconnected position to the closed position. When the moving contact reaches the closed position, the contact microswitch is actuated to the contact micro-movement closed state, and the mechanical switch is closed. At the same time, when the handle moves to the closing position, the handle microswitch is actuated to the handle micro-movement closed state. At this time, the solid-state circuit breaker reaches the hot standby state. When the solid-state circuit breaker is in the hot standby state, if the electronic switch is closed, the solid-state circuit breaker is closed.

8. The solid-state circuit breaker according to any one of claims 4 to 6, further comprising a trip unit configured to trip when electronically driven, so that the transmission assembly is actuated to switch the moving contact from the closed position to the open position and to switch the handle from the closed position to the open position.

9. The solid-state circuit breaker according to claim 8, wherein: The trip unit comprises: an electromagnet configured to operate when energized; The trip rod is pushed by the electromagnet when the electromagnet is actuated, so that the transmission assembly can quickly open the moving contact and switch the handle to the opening position under the action of the main spring connected between the handle and the transmission assembly.

10. The solid-state circuit breaker according to claim 8, wherein: In case of electric opening: The electronic switch opens, and then the electronically driven trip unit is driven, the transmission assembly is actuated to move the moving contact from the closed position toward the open position, when the moving contact leaves the closed position, the contact microswitch is released to the contact micromovement open state, when the moving contact reaches the open position, the mechanical switch opens, the solid-state circuit breaker opens, and at the same time, the transmission assembly is actuated to move the handle from the closed position toward the open position, when the handle leaves the closed position, the handle microswitch is released to the handle micromovement open state, and the handle finally stops at the open position.

11. The solid-state circuit breaker according to claim 8, wherein: In case of manual opening: Manually rotate the handle from the closing position toward the opening position. When the handle leaves the closing position, the handle microswitch is released to the handle micro-opening state. At this time, in response to the handle micro-opening state of the handle micro-switch, the electronic switch opens, and then the electronic drive trip unit is actuated, and the transmission assembly is actuated to move the moving contact from the closing position toward the opening position. When the moving contact leaves the closing position, the contact micro-switch is released to the contact micro-opening state. When the moving contact reaches the opening position, the mechanical switch opens, thereby the solid-state circuit breaker opens, and the handle stops at the opening position.

12. The solid-state circuit breaker according to claim 9, wherein: In case of manual opening when the electromagnet fails: The handle is manually rotated from the closing position. When the handle leaves the closing position, the handle microswitch is released to the handle micro-open state. At this time, in response to the handle micro-open state of the handle microswitch, the electronic switch is open. However, the trip unit cannot trip due to the failure of the electromagnet. The handle cannot be parked in the open position, and then continues to be rotated to the energy storage position, so that the moving contact is manually made to reach the disconnected position, the mechanical switch is open, and thus the solid-state circuit breaker is open, and the handle is parked in the energy storage position.

13. The solid-state circuit breaker according to claim 12, wherein: The handle cannot stop at the open position when the gate is manually opened, indicating that the electromagnet has failed.

14. The solid-state circuit breaker according to any one of claims 1 to 6, comprising a plurality of breaking units and a transmission linkage configured to synchronize the plurality of breaking units, the transmission linkage being connected to the plurality of breaking units and configured to link the movable contacts of the plurality of breaking units.

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