CN116705566A - Circuit breaker - Google Patents

Abstract

A breaker relates to the technical field of a piezoelectric device. The circuit breaker comprises a shell, and a negative electrode unit, a negative electrode incoming line terminal and a negative electrode outgoing line terminal which are arranged on the shell, wherein two ends of the negative electrode unit are respectively electrically connected with the negative electrode incoming line terminal and the negative electrode outgoing line terminal, the negative electrode unit comprises a moving contact assembly, a fixed contact and an electronic assembly, the moving contact assembly and the fixed contact jointly form a mechanical breakpoint of the negative electrode unit, the electronic assembly comprises a circuit board, an electronic switch arranged on the circuit board, a trigger unit and a control circuit, the electronic switch is connected in series with the mechanical breakpoint, and the trigger unit and the electronic switch are electrically connected with the control circuit. The mechanical breaking point of the circuit breaker is free of load breaking, no arc is generated, breaking performance is high, and service life and reliability are high. Meanwhile, an arc extinguishing chamber is saved, and the size is smaller.

Description

Circuit breaker

Technical Field

The application relates to the technical field of piezoelectric devices, in particular to a circuit breaker.

Background

Circuit breakers are the most important control devices in power systems and are also the most frequently operated devices. The circuit breaker has the functions of switching off and switching on a load circuit, and automatically breaking the circuit when the circuit has faults such as overload, short circuit, over-temperature, over-under voltage and the like, thereby playing a role in protecting, preventing the expansion of accidents and ensuring safe operation.

The existing transmission mechanism and breaking mechanism of the circuit breaker used in the low-voltage distribution field adopt a large number of mechanical parts, when a load is disconnected, electric arcs are often generated, contacts are easy to burn out, the breaking time is long, and the requirements of some electric power users on the rapidity of breaking fault currents are difficult to meet; meanwhile, mechanical and electrical life of the mechanical circuit breaker is limited, and the requirement of high life cannot be met.

Disclosure of Invention

The application aims to provide a circuit breaker, which has no arc generation during opening, can realize quick response, and has higher breaking performance and service life.

Embodiments of the present application are implemented as follows:

the embodiment of the application provides a circuit breaker, which comprises a shell, and a negative electrode unit, a negative electrode incoming line terminal and a negative electrode outgoing line terminal which are arranged on the shell, wherein two ends of the negative electrode unit are respectively and electrically connected with the negative electrode incoming line terminal and the negative electrode outgoing line terminal; the moving contact assembly moves along the closing direction, contacts with the fixed contact to close the mechanical break point, contacts with the trigger unit, and sends a contact signal to the control circuit, and the control circuit controls the electronic switch to be turned on to close the negative electrode unit; the movable contact assembly moves along the opening direction and is separated from the trigger unit, the trigger unit sends a separation signal to the control circuit, the control circuit controls the electronic switch to be disconnected, the negative electrode unit is disconnected, and then the movable contact assembly is separated from the fixed contact, so that the mechanical break point is disconnected, and the opening is realized.

Optionally, the trigger unit is a micro switch, and the moving contact assembly continues to move after closing to drive the micro switch to close, and the micro switch sends a contact signal to the control circuit.

Optionally, the moving contact assembly comprises a contact support and a moving contact arranged on the contact support, the moving contact comprises a first fixed contact and a second fixed contact, the first fixed contact and the second fixed contact are respectively contacted with or separated from the moving contact at the same time, and the first fixed contact is positioned on the side surface of the negative electrode incoming line terminal and is electrically connected with the negative electrode incoming line terminal; the electronic component further comprises an inductor, the second static contact is located on the side face of the inductor and connected with the inductor in series, the other end of the inductor is electrically connected with the circuit board, the inductor plays a decoupling role in the negative electrode unit, and the inductor is matched with the gas discharge tube to ignite and bypass lightning surge to the bus.

Optionally, the electronic component further comprises a resistor electrically connected with the circuit board, the inductor, the electronic switch and the resistor are sequentially connected in series, and the resistor is further electrically connected with the negative electrode incoming line terminal.

Optionally, the moving contact assembly comprises a contact support, a moving contact and a first elastic piece, the contact support is arranged on the shell in a sliding mode, the moving contact is arranged on the contact support in a sliding mode, the contact support and the moving contact move linearly, the first elastic piece is connected with the moving contact and the contact support respectively, and after the moving contact and the fixed contact are switched on, the first elastic piece is compressed and stores energy.

Optionally, the movable contact assembly further comprises a fixed buckle, the shell is further provided with a handle assembly, the handle assembly is in driving fit with the contact support, the fixed buckle is provided with a first clamping portion, the handle assembly is provided with a second clamping portion, and the handle assembly and the fixed buckle are clamped through the first clamping portion and the second clamping portion, so that the contact support and the triggering unit are kept in a contact state.

Optionally, the fixing buckle further has an unlocking part, the handle assembly has a guiding part, the guiding part has a driving part matched with the unlocking part, the handle assembly is driven to move and drives the fixing buckle to be in clamping connection with the handle assembly through the driving part and the unlocking part, and the first elastic piece releases energy and drives the contact support to be separated from the triggering unit.

Optionally, a tripping assembly electrically connected with the circuit board is further arranged in the shell, and a monitoring circuit is further arranged on the circuit board and used for monitoring the current value, the voltage value and the temperature value of the circuit breaker and sending an abnormal monitoring signal to the control circuit; if the abnormal monitoring signal exceeds the first preset level but does not exceed the second preset level, the control circuit controls the electronic switch to be turned off, and if the abnormal monitoring signal exceeds the second preset level, the control circuit controls the electronic switch to be turned off and sends a tripping signal to the tripping assembly, and the tripping assembly drives the fixed buckle to be in clamping connection with the handle assembly, so that the mechanical breakpoint is disconnected.

Optionally, the electronic component further comprises a lightning protection circuit, an input end and an output end of the lightning protection circuit are respectively communicated with the negative electrode incoming line terminal and the negative electrode outgoing line terminal and are connected with the negative electrode unit in parallel, and the lightning protection circuit is used for bypassing lightning stroke energy.

Optionally, the shell is further internally provided with a positive electrode unit and a communication assembly electrically connected with the circuit board, the positive electrode unit comprises a positive electrode copper bar, a positive electrode wire inlet terminal and a positive electrode wire outlet terminal, two ends of the positive electrode copper bar are respectively electrically connected with the positive electrode wire inlet terminal and the positive electrode wire outlet terminal, an input end and an output end of the communication assembly are respectively electrically connected with the circuit board and a backboard in the cabinet, the communication assembly receives instruction information sent by the cabinet and transmits real-time working information of the circuit breaker to the cabinet, the negative electrode wire inlet terminal is connected with the copper bar of the cabinet, and the negative electrode wire outlet terminal and the positive electrode wire inlet terminal are respectively connected with the load circuit.

The beneficial effects of the embodiment of the application include:

the circuit breaker provided by the embodiment of the application comprises a shell, and a negative electrode unit, a negative electrode incoming line terminal and a negative electrode outgoing line terminal which are arranged on the shell, wherein two ends of the negative electrode unit are respectively and electrically connected with the negative electrode incoming line terminal and the negative electrode outgoing line terminal; the moving contact assembly moves along the closing direction, contacts with the fixed contact to close the mechanical break point, contacts with the trigger unit, and sends a contact signal to the control circuit, and the control circuit controls the electronic switch to be turned on to close the negative electrode unit; the movable contact assembly moves along the opening direction and is separated from the trigger unit, the trigger unit sends a separation signal to the control circuit, the control circuit controls the electronic switch to be disconnected, the negative electrode unit is disconnected, and then the movable contact assembly is separated from the fixed contact, so that the mechanical break point is disconnected, and the opening is realized. The breaker has the advantages of no load breaking of mechanical breaking points, no electric arc generation, high breaking performance, and higher service life and reliability. Meanwhile, an arc extinguishing chamber is saved, the internal structure is more compact, and the volume is smaller.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an internal structure of a circuit breaker according to an embodiment of the present application;

fig. 2 is a schematic diagram of a partial structure of a circuit breaker according to an embodiment of the present application;

fig. 3 is a schematic topology diagram of a negative electrode unit in a circuit breaker according to an embodiment of the present application;

fig. 4 is a schematic view of the cooperation of the handle assembly and the fixing buckle in the circuit breaker according to the embodiment of the application;

FIG. 5 is a second schematic view of the handle assembly and the retaining buckle of the circuit breaker according to the embodiment of the present application;

fig. 6 is a schematic structural diagram of an anode unit in a circuit breaker according to an embodiment of the present application;

fig. 7 is a schematic diagram of an external structure of a circuit breaker according to an embodiment of the present application.

Icon: a 100-circuit breaker; 110-a housing; 120-negative electrode incoming line terminal; 130-a negative outlet terminal; 141-a contact holder; 142-moving contact; 1431—a first stationary contact; 1432—a second stationary contact; 144-electronic components; 1441-microswitch; 1442-inductance; 1443-electronic switch; 1444-resistance; 1445-lightning protection circuit; 145-fixing buckle; 1451-a first clamping part; 1452-unlocking part; 146-a second elastic member; 147-a first elastic member; 150-a handle assembly; 151-a second clamping portion; 152-clamping wall; 153-transition wall; 154-guide inclined wall; 155-a guide; 1551-a drive part; 160-trip assembly; 170-a communication assembly; 181-an anode wire inlet terminal; 182-positive outlet terminal; 183-positive copper bar.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 and 2 in combination, an embodiment of the present application provides a circuit breaker 100, which includes a housing 110, and a negative electrode unit, a negative electrode incoming line terminal 120 and a negative electrode outgoing line terminal 130 disposed on the housing 110, wherein an incoming line end and an outgoing line end of the negative electrode unit are respectively electrically connected with the negative electrode incoming line terminal 120 and the negative electrode outgoing line terminal 130, so as to access a load circuit through the negative electrode incoming line terminal 120 and the negative electrode outgoing line terminal 130, so that the circuit breaker 100 can control the on and off of the load circuit through the closing or opening of the negative electrode unit.

The negative electrode unit comprises a moving contact assembly, a fixed contact and an electronic assembly 144, wherein the moving contact assembly and the fixed contact jointly form a mechanical breakpoint of the negative electrode unit, and the moving contact assembly moves in the shell 110 along the closing direction and can be in contact with the fixed contact to realize closing, so that the mechanical breakpoint is closed; the movement in the opening direction in the shell 110 can realize opening with the fixed contact in a separation mode, so that the mechanical break point is disconnected; the switching-on direction and the switching-off direction of the moving contact assembly are opposite. It should be understood that the on-off gate in the present application refers to both on-off gate and off-gate. The electronic assembly 144 includes a circuit board, an electronic switch 1443 disposed on the circuit board, a trigger unit, and a control circuit, the electronic switch 1443 being in series with the mechanical break, the trigger unit and the electronic switch 1443 being electrically connected to the control circuit.

After the moving contact assembly is contacted with the fixed contact to be closed, the moving contact assembly continuously moves along the closing direction, and contacts with a trigger unit on the circuit board while keeping contact with the fixed contact, the trigger unit sends a contact signal to a control circuit, and the control circuit controls the electronic switch 1443 to be conducted according to the received trigger signal so that the negative electrode unit is closed; the moving contact assembly moves along the opening direction, the moving contact assembly is separated from a trigger unit on the circuit board, the trigger unit sends a separation signal to a control circuit, the control circuit controls the electronic switch 1443 to be disconnected according to the received separation signal, so that the negative electrode unit is disconnected, and then the moving contact assembly continues to move along the opening direction and is separated from the fixed contact. Referring to fig. 3 in combination, fig. 3 shows a schematic topology diagram of the negative unit, where the moving contact assembly and the fixed contact form a mechanical break point S1 of the negative unit, acting as physical isolation, and the moving contact assembly and the trigger unit form an electronic break point of the negative unit, where the mechanical break point and the electronic break point are connected in series, and are closed at the same time, and if the negative unit is closed, and if any one of the negative units is opened, the negative unit is opened. Therefore, when the movable contact assembly and the fixed contact are separated, the negative electrode unit is in an off state, no electric arc is generated, the quick response of opening and closing the brake can be realized, the breaking performance of the circuit breaker 100 is improved, and the service life is longer. Meanwhile, no arc is generated during opening, so that an arc extinguishing chamber is not required to be arranged in the circuit breaker 100, the size of the circuit breaker 100 can be reduced, and the circuit breaker 100 is beneficial to miniaturization.

In summary, the circuit breaker 100 provided by the embodiment of the application belongs to a solid-state circuit breaker, and has the advantages of no-load breaking of mechanical breaking points, no arc generation, high breaking performance, and higher service life and reliability. Meanwhile, an arc extinguishing chamber is saved, the internal structure of the circuit breaker 100 can be more compact, and the miniaturization design of the circuit breaker 100 is facilitated.

Optionally, in an implementation manner of the embodiment of the present application, the trigger unit is a micro switch 1441, and the moving contact assembly continues to move after closing to drive the micro switch 1441 to close, and the micro switch 1441 sends a contact signal to the control circuit.

The micro switch 1441 is located in the closing direction of the moving contact assembly and is electrically connected with the circuit board. After the moving contact assembly is contacted with the fixed contact to be switched on, the moving contact assembly continuously moves along the switching-on direction to drive the micro switch 1441 to be closed, a contact signal is sent to the control circuit after the micro switch 1441 is closed, and then the control circuit controls the electronic switch 1443 to be switched on. It can be appreciated that the moving contact assembly moves along the opening direction, after being separated from the micro switch 1441, the micro switch 1441 is automatically reset and disconnected, the micro switch 1441 sends a separation signal to the control circuit after being disconnected, and the control circuit controls the electronic switch 1443 to be disconnected. The structure of the micro switch 1441 is conventional and will not be described herein.

Referring to fig. 2 and 3, in an alternative implementation manner of the embodiment of the present application, the moving contact assembly includes a contact support 141 and a moving contact 142 disposed on the contact support 141, the moving contact includes a first fixed contact 1431 and a second fixed contact 1432, the first fixed contact 1431 and the second fixed contact 1432 are respectively contacted with or separated from the moving contact 142 at the same time, and the first fixed contact 1431 is located at a side surface of the negative incoming line terminal 120 and is electrically connected with the negative incoming line terminal 120; the electronic assembly 144 further includes an inductor 1442, and a second fixed contact 1432 is located on a side of the inductor 1442 and connected in series with the inductor 1442, and preferably, the second fixed contact 1432 is integrated with the inductor 1442; the other end of the inductor 1442 is electrically connected to the circuit board, and the inductor 1442 has a decoupling function in the negative electrode unit, and is matched with the gas discharge tube to ignite and bypass lightning surge to the bus.

Without inductance 1442, the momentarily increased current may cause a fatal shock to other electronic components in the negative cell. By providing an inductance 1442 in the negative unit, inrush current protection is achieved.

Optionally, in an implementation manner of the embodiment of the present application, the electronic component 144 further includes a resistor 1444 electrically connected to the circuit board, and an inductor 1442, an electronic switch 1443, and a resistor 1444 are sequentially connected in series. One end of the mechanical break point is connected with the inductor 1442 in series and then is connected with the electronic switch 1443, the other end of the mechanical break point is electrically connected with the negative electrode outgoing terminal 130, the other end of the electronic switch 1443 is also connected with the resistor 1444, and the resistor 1444 is electrically connected with the negative electrode incoming terminal 120. Electronic switch 1443 is used to control electrical conduction in the negative unit and resistor 1444 is used to detect the current signal.

Referring to fig. 2, in an alternative implementation manner of the embodiment of the present application, the moving contact assembly includes a contact support 141, a moving contact 142 and a first elastic member 147, and two ends of the first elastic member 147 are respectively connected to the contact support 141 and the moving contact 142. The contact holder 141 is slidably disposed in the housing 110, and moves in a linear reciprocating manner in the housing 110, and the moving contact 142 is slidably moved in a linear reciprocating manner with respect to the contact holder 141 by the first elastic member 147. The extending direction of the first elastic piece 147 is parallel to the closing direction, after the moving contact 142 and the fixed contact are closed, the contact support 141 is continuously driven, the first elastic piece 147 can be compressed to enable the contact support 141 to continuously move for a section of displacement towards the closing direction, so that the contact support 141 can be enabled to be in contact with a triggering unit on a circuit board, and a control circuit controls an electronic switch 1443 in the negative electrode unit to be conducted, and the negative electrode unit is closed. Meanwhile, by means of the deformation of the first elastic member 147, a pressing force for contacting the moving contact 142 with the fixed contact can be provided, so that stable contact between the moving contact 142 and the fixed contact is ensured. The first elastic member 147 is a spring, for example.

In order to achieve continuous and stable contact between the contact support 141 and the trigger unit, referring to fig. 2 and 4, optionally, in an embodiment of the present application, the moving contact 142 assembly further includes a fixing buckle 145, and the housing 110 is further provided with a handle assembly 150, where the handle assembly 150 is in driving fit with the contact support 141, that is, the handle assembly 150 directly drives the contact support 141 to move, so that the contact support 141 drives the moving contact 142 to contact with or separate from the fixed contact. The holder 145 has a first engaging portion 1451, the handle assembly 150 has a second engaging portion 151, and the handle assembly 150 is engaged with the holder 145 by the first engaging portion 1451 and the second engaging portion 151 so as to hold the contact holder 141 in a position contacting the trigger unit.

Specifically, as shown in fig. 2, the fixing buckle 145 moves linearly, and the moving direction of the fixing buckle 145 is approximately perpendicular to the moving direction of the handle assembly 150; as shown in fig. 4, a second clamping portion 151 is provided on a side of the handle assembly 150 near the first clamping portion 1451, and the second clamping portion 151 is a protrusion, and the protrusion has a clamping wall 152, a transition wall 153 and a guiding inclined wall 154 sequentially arranged along a rightward direction, so that during a closing process, the handle assembly 150 moves gradually rightward, and the first clamping portion 1451 is clamped and locked with the clamping wall 152 of the second clamping portion 151 after passing through the guiding inclined wall 154 and the transition wall 153 sequentially, so that the handle assembly 150 is limited in a closing position (closing state), and when the first clamping portion 1451 passes through the guiding inclined wall 154, the fixing buckle 145 is correspondingly driven to slide downward, so as to keep abutting with the clamping wall 152 beyond the transition wall 153, thereby limiting the contact bracket 141 at a position contacting with the triggering unit.

In order to make the first clamping portion 1451 smoothly clamped with the second clamping portion 151, as shown in fig. 2, a second elastic member 146 connected with the fixing buckle 145 is further provided, so that when the handle assembly 150 moves towards the closing direction and the first clamping portion 1451 moves along the guiding inclined wall 154 to drive the fixing buckle 145 to slide downwards, the second elastic member 146 is correspondingly made to store energy, and therefore, after the first clamping portion 1451 passes over the second clamping portion 151, energy can be released through the second elastic member 146 to provide an acting force to the fixing buckle 145, so that the fixing buckle 145 moves upwards to reset, and in the resetting process, the first clamping portion 1451 and the second clamping portion 151 finish clamping.

In order to realize manual opening and disconnect the negative electrode unit before opening, referring to fig. 2 and 5, in an alternative implementation manner of the embodiment of the present application, the fixing buckle 145 further has an unlocking portion 1452, the handle assembly 150 has a guiding portion 155, the guiding portion 155 has a driving portion 1551 matched with the unlocking portion 1452, the handle assembly 150 is driven to move and drives the fixing buckle 145 to release the clamping connection with the handle assembly 150 through the driving portion 1551 and the unlocking portion 1452, and the first elastic member 147 releases energy and drives the contact support 141 to separate from the triggering unit.

Specifically, when the external force acts on the handle assembly 150 to make the handle assembly 150 move toward the closing direction, the handle assembly 150 drives the moving contact assembly to contact with the fixed contact to complete closing, as described above, the first clamping portion 1451 passes over the second clamping portion 151 and is clamped and locked with the second clamping portion 151, and in this process, the unlocking portion 1452 also passes over the driving portion 1551 of the guiding portion 155 and is matched with the unlocking wall of the driving portion 1551. When an external force acts on the handle assembly 150 to move the handle assembly 150 towards the opening direction, the handle assembly 150 and the fixing buckle 145 are locked by the first clamping part 1451 and the second clamping part 151, so that when the handle assembly 150 is driven by the external force to move towards the opening direction (leftwards in fig. 2), the unlocking wall of the driving part 1551 moves relative to the unlocking part 1452 to pass over the driving part 1551, and in the process, the driving part 1551 drives the fixing buckle 145 to move downwards through the unlocking part 1452, thereby the first clamping part 1451 on the fixing buckle 145 and the second clamping part 151 on the handle body are released from the clamping state, then the external force is removed, the first elastic piece 147 releases energy, and the movable contact support 141 is separated from the triggering unit.

Referring to fig. 1, in an alternative implementation manner of the embodiment of the present application, a trip assembly 160 electrically connected to a circuit board is further provided in the housing 110, and a monitoring circuit is further provided on the circuit board, where the monitoring circuit monitors a current value, a voltage value and a temperature value of the circuit breaker 100 when the circuit breaker 100 is in a closed state; if the abnormal monitoring signal exceeds the first preset level but does not exceed the second preset level, the control circuit controls the electronic switch to be turned off, and if the abnormal monitoring signal exceeds the second preset level, the control circuit controls the electronic switch to be turned off and sends a tripping signal to the tripping component 160, and the tripping component 160 drives the fixed buckle to be in clamping connection with the handle component 150 so as to disconnect the mechanical breakpoint.

The first preset level and the second preset level are monitor values for numerical division of current, voltage and temperature. If at least one of the current value, the voltage value or the temperature value exceeds the corresponding first preset level but is lower than the corresponding second preset level, the circuit breaker 100 has an abnormal fault and the electronic switch needs to be turned off. If at least one of the current value, the voltage value, or the temperature value exceeds its corresponding second preset level, the circuit breaker 100 fails, and the electronic switch and trip assembly 160 is opened.

Specifically, the control circuit sends a control signal to the trip assembly 160, and after the trip assembly 160 receives the control signal, the internal iron core moves to drive the striking rod to strike the fixed buckle 145. The fixing buckle 145 is moved downward after being hit, the first clamping portion 1451 and the second clamping portion 151 are released from being clamped, the negative electrode unit is unlocked, and the handle assembly 150 is ejected. The trip assembly 160 provides backup protection with the mechanical break point, cutting off the negative unit. The trip assembly 160 may be connected to the circuit board by pins, wires, or plugs and sockets, and preferably the trip assembly 160 is connected to the circuit board by pins to reduce wiring within the circuit breaker 100.

Optionally, in an implementation manner of the embodiment of the present application, the electronic component 144 further includes a lightning protection circuit 1445, where an input end and an output end of the lightning protection circuit 1445 are respectively connected to the negative incoming line terminal 120 and the negative outgoing line terminal 130 and are connected in parallel to the negative unit, and the lightning protection circuit 1445 is used to bypass lightning stroke energy, so as to avoid permanent damage or damage to the electronic solid-state switching device caused by the lightning stroke energy.

Referring to fig. 6 and 7, in an alternative implementation manner of the embodiment of the present application, a positive unit and a communication assembly 170 electrically connected to a circuit board are further disposed in the housing 110, the positive unit includes a positive copper bar 183, a positive wire inlet terminal 181 and a positive wire outlet terminal 182, and two ends of the positive copper bar 183 are electrically connected to the positive wire inlet terminal 181 and the positive wire outlet terminal 182 respectively. The positive and negative pole units together form the power circuit of the circuit breaker 100.

The input end and the output end of the communication component 170 are respectively and electrically connected with the circuit board and the backboard in the cabinet, the communication component 170 receives instruction information sent by the cabinet and transmits real-time working information of the circuit breaker 100 to the cabinet, the negative electrode wire inlet terminal 120 is connected with a copper bar of the cabinet, and the negative electrode wire outlet terminal 130 and the positive electrode wire inlet terminal 181 are connected with a load circuit. The communication system receives and transmits instructions bidirectionally, and the client system of the cabinet issues instructions to call the information of the circuit breaker 100, so that the circuit breaker 100 can actively upload the information to the cabinet, and the information comprises current, voltage, temperature, power and the like. The communication assembly 170 is constructed in the prior art and is not described herein.

Compared with a mechanical circuit breaker, the circuit breaker 100 internally comprises a large number of power electronic devices, can intelligently collect various information in the circuit or the circuit breaker 100, such as current, voltage, temperature, electric quantity, power and the like, has various functions of detecting key device indexes, controlling devices, communication and the like, and is high in sensitivity and quick in response.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The circuit breaker is characterized by comprising a shell, a negative electrode unit, a negative electrode incoming line terminal and a negative electrode outgoing line terminal, wherein the negative electrode unit, the negative electrode incoming line terminal and the negative electrode outgoing line terminal are arranged in the shell, two ends of the negative electrode unit are respectively and electrically connected with the negative electrode incoming line terminal and the negative electrode outgoing line terminal, the negative electrode unit comprises a moving contact assembly, a fixed contact and an electronic assembly, the moving contact assembly and the fixed contact jointly form a mechanical breakpoint of the negative electrode unit, the electronic assembly comprises a circuit board, an electronic switch, a trigger unit and a control circuit, the electronic switch is connected in series with the mechanical breakpoint, and the trigger unit and the electronic switch are electrically connected with the control circuit;

the movable contact assembly moves along a closing direction, contacts with the fixed contact to enable the mechanical break point to be closed, and then contacts with the trigger unit, the trigger unit sends a contact signal to the control circuit, and the control circuit controls the electronic switch to be conducted to enable the negative electrode unit to be closed; the movable contact assembly moves along the opening direction and is separated from the trigger unit, the trigger unit sends a separation signal to the control circuit, the control circuit controls the electronic switch to be disconnected, so that the negative electrode unit is disconnected, and then the movable contact assembly is separated from the fixed contact, so that the mechanical break point is disconnected, and the opening is realized.

2. The circuit breaker of claim 1, wherein the trigger unit is a micro switch, the moving contact assembly continues to move after closing to drive the micro switch to close, and the micro switch sends a contact signal to the control circuit.

3. The circuit breaker according to claim 1, wherein the moving contact assembly comprises a contact bracket and a moving contact arranged on the contact bracket, the moving contact comprises a first moving contact and a second moving contact, the first moving contact and the second moving contact are respectively contacted with or separated from the moving contact at the same time, and the first moving contact is positioned on the side surface of the negative incoming terminal and is electrically connected with the negative incoming terminal;

the electronic component further comprises an inductor, the second static contact is located on the side face of the inductor and connected with the inductor in series, the other end of the inductor is electrically connected with the circuit board, the inductor plays a decoupling role in the negative electrode unit, and the inductor is matched with a gas discharge tube to ignite and bypass lightning stroke surge to the bus.

4. The circuit breaker of claim 3, wherein the electronic assembly further comprises a resistor electrically connected to the circuit board, the inductor, the electronic switch, and the resistor being serially connected in sequence, the resistor further being electrically connected to the negative incoming terminal.

5. The circuit breaker of claim 1, wherein the moving contact assembly comprises a contact support, a moving contact and a first elastic member, the contact support is slidably arranged on the housing, the moving contact is slidably arranged on the contact support, the contact support and the moving contact are both in linear motion, the first elastic member is respectively connected with the moving contact and the contact support, and after the moving contact is closed with the fixed contact, the first elastic member is compressed and stores energy.

6. The circuit breaker of claim 5, wherein the moving contact assembly further comprises a fixed buckle, a handle assembly is further arranged on the shell, the handle assembly is in driving fit with the contact support, the fixed buckle is provided with a first clamping part, the handle assembly is provided with a second clamping part, and the handle assembly is clamped with the fixed buckle through the first clamping part and the second clamping part, so that the contact support and the triggering unit are kept in a contact state.

7. The circuit breaker of claim 6, wherein the fixing buckle further comprises an unlocking part, the handle assembly comprises a guiding part, the guiding part comprises a driving part matched with the unlocking part, the handle assembly is driven to move and drives the fixing buckle to be in clamping connection with the handle assembly through the driving part and the unlocking part, and the first elastic piece releases energy and drives the contact support to be separated from the triggering unit.

8. The circuit breaker of claim 6, wherein a trip assembly is further disposed in the housing and electrically connected to the circuit board, and a monitoring circuit is further disposed on the circuit board, and is configured to monitor a current value, a voltage value, and a temperature value of the circuit breaker and send an abnormality monitoring signal to the control circuit; if the abnormality monitoring signal exceeds the first preset level but does not exceed the second preset level, the control circuit controls the electronic switch to be turned off, and if the abnormality monitoring signal exceeds the second preset level, the control circuit controls the electronic switch to be turned off and sends a tripping signal to the tripping component, and the tripping component drives the fixing buckle to be in clamping connection with the handle component, so that the mechanical breakpoint is disconnected.

9. The circuit breaker according to any one of claims 1 to 8, wherein the electronic assembly further comprises a lightning protection circuit, the input and output of the lightning protection circuit being in communication with the negative incoming terminal and the negative outgoing terminal, respectively, and in parallel with the negative unit, the lightning protection circuit being for bypassing lightning strike energy.

10. The circuit breaker according to any one of claims 1 to 8, wherein a positive electrode unit and a communication assembly electrically connected with the circuit board are further arranged in the housing, the positive electrode unit comprises a positive electrode copper bar, a positive electrode wire inlet terminal and a positive electrode wire outlet terminal, and two ends of the positive electrode copper bar are respectively electrically connected with the positive electrode wire inlet terminal and the positive electrode wire outlet terminal; the input end and the output end of the communication component are respectively and electrically connected with the circuit board and the backboard in the cabinet, the communication component receives instruction information sent by the cabinet and transmits real-time working information of the circuit breaker to the cabinet, the negative electrode wire inlet terminal is connected with the copper bar of the cabinet, and the negative electrode wire outlet terminal and the positive electrode wire inlet terminal are respectively connected with the load circuit.