阅读说明：本技术 一种微功耗机械双稳态接触器及其控制方法 (Micro-power-consumption mechanical bistable contactor and control method thereof ) 是由 温祥彬 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种微功耗机械双稳态接触器及其控制方法,涉及接触器技术领域,包括电气控制单元和机械联动单元,电气控制单元用于控制机械联动单元实现接触器断开、吸合、回路失电复位动作,电气控制单元包括接触器本体KM、电压继电器KA和储能电容C,触器本体KM用于外接控制电压并与机械联动单元相连,实现断开、吸合、回路失电复位动作。本发明提供的吸合锁定机构在电气控制单元的控制下可以对接触器机械保持吸合状态,使接触器仅在瞬时接通或瞬时断开的时候消耗电能,而后保持接通状态时或断开后不再消耗电能,进而降低接触器的使用功耗,并可以解决接触器运行时的噪音问题,另外有储能电容和电压继电器的配合操作实现接触器的回路失电复位动作。(The invention discloses a micro-power-consumption mechanical bistable contactor and a control method thereof, and relates to the technical field of contactors. The pull-in locking mechanism provided by the invention can mechanically maintain the pull-in state of the contactor under the control of the electric control unit, so that the contactor only consumes electric energy when being instantly connected or instantly disconnected, and then does not consume electric energy when being kept in the connected state or after being disconnected, thereby reducing the use power consumption of the contactor, solving the noise problem when the contactor operates, and realizing the power-off reset action of a loop of the contactor by the matching operation of an energy storage capacitor and a voltage relay.)

1. A micro-power mechanical bistable contactor is characterized in that: comprises an electrical control unit and a mechanical linkage unit, wherein the electrical control unit is used for controlling the mechanical linkage unit to realize the actions of disconnecting, attracting and resetting the contactor when the circuit is power off,

the electric control unit comprises a contactor body KM, a voltage relay KA and an energy storage capacitor C,

the contactor body KM is used for externally connecting control voltage and is connected with the mechanical linkage unit to realize disconnection, attraction and return circuit power-off reset actions;

the voltage relay KA is used for externally connecting control voltage, and forms a power-on loop with the energy storage capacitor C and the disconnecting coil of the contactor body KM when the loop loses power;

the energy storage capacitor C is used for externally connecting control voltage and storing energy, and triggers the disconnection action of the contactor body KM when forming a power-on loop with a disconnection coil of the contactor body KM;

And the mechanical linkage unit is internally provided with a suction locking mechanism, and the suction locking mechanism is used for mechanically keeping the stable state of the contactor after a suction action instruction sent by the electrical control unit is obtained.

2. The micro-power mechanical bistable contactor of claim 1, wherein: the contactor body KM comprises an attraction coil (2), a disconnection coil (9) and a moving contact (5) and is arranged on a static contact (6) below the moving contact (5), the attraction coil (2) is connected with external control voltage through a fuse, a starting button used for switching on the control voltage is further arranged between the attraction coil (2) and the fuse, the energy storage capacitor C is connected with the external control voltage through a diode, and the diode is connected with the external control voltage through the fuse.

3. The micro-power mechanical bistable contactor of claim 2, wherein: the disconnection coil (9) is connected with the energy storage capacitor C through the voltage relay KA, the diode is connected with the disconnection coil (9), and a stop button for disconnecting the control voltage is arranged between the diode and the disconnection coil (9).

4. The micro-power mechanical bistable contactor of claim 3, wherein: the mechanical linkage unit comprises

The sliding block (1) is arranged above the moving contact (5), the tension spring (3) is used for pulling the sliding block (1) in one direction, and the sliding block (1) is attracted by the attraction coil (2) in the other direction and is used for extruding the moving contact (5), so that the moving contact (5) is attached to the fixed contact (6);

the first pressure spring (7) is arranged on the bottom side of the moving contact (5), and the first pressure spring (7) is used for jacking the moving contact (5);

a clamping block (10) arranged at the bottom side of the breaking coil (9), a second pressure spring (8) is arranged between the clamping block (10) and the breaking coil (9), the second pressure spring (8) is used for pressing the clamping block (10) downwards, and the breaking coil (9) is used for attracting the clamping block (10);

a block (11) is fixed on the top side of the sliding block (1), the block (11) and the fixture block (10) are mutually attached to clamp the position of the sliding block (1), so that the moving contact (5) is extruded by the sliding block (1), and the second pressure spring (8), the fixture block (10) and the block (11) form the suction locking mechanism.

5. The micro-power mechanical bistable contactor of claim 4, wherein: still include the fixed plate, the fixed plate is used for fixing the one end of extension spring (3), the other end of extension spring (3) is fixed in the left end of slider (1), actuation coil (2) set up in the right-hand side of slider (1).

6. The micro-power mechanical bistable contactor of claim 4, wherein: the upper surface of the block (11) is an inclined surface, the side surface of the block (11) is a vertical surface, the bottom side surface of the fixture block (10) is an inclined surface, and the bottom side surface of the fixture block (10) is parallel to the upper surface of the block (11).

7. The micropower mechanical bistable contactor of claim 6, wherein: the top end of the moving contact (5) is connected with the bottom side surface of the sliding block (1) in a sliding mode, and the clamping blocks (10) are connected with the upper surface of the sliding block (1) and the upper surface of the stopping block (11) in a sliding mode respectively.

8. The micro-power mechanical bistable contactor of claim 4, wherein: the bottom side surface of the sliding block (1) is divided into a horizontal plane and an inclined plane positioned on the right side of the horizontal plane, and the horizontal plane is used for extruding the moving contact (5).

9. The control method of the micro-power mechanical bistable contactor according to any of claims 1-8, characterized in that: including a normal operation control mode and a loop loss control mode,

the normal operation control mode includes the steps of,

step (a 1), the contactor is in the initial state:

when the attraction coil (2) does not act, the sliding block (1) is in a left end static state under the action of the tension spring (3), the moving contact (5) is under the action of the first pressure spring (7) to separate the moving contact (5) from the static contact (6), and the contactor is in a disconnected state;

actuation;

step (B1), the contactor performs pull-in action:

step (B11), the start button is pressed, the attraction coil (2) is electrified, and the attraction slide block (1) slides rightwards under the action of the magnetic force of the attraction coil (2);

step (B12), in the process that the sliding block (1) slides rightwards, the bottom side of the sliding block (1) presses the moving contact (5) downwards, so that the moving contact (5) overcomes the acting force of the first pressure spring (7), and the moving contact (5) is contacted with the static contact (6), so as to switch on the main circuit;

step (B13), in the process that the sliding block (1) slides rightwards, the fixture block (10) above the sliding block (1) goes over the stop block (11) on the top side of the sliding block (1), the fixture block (10) is clamped with the stop block (11) under the action of the second pressure spring (8), and the sliding block (1) is locked at the position where the movable contact (5) is connected with the fixed contact (6); the attraction coil (2) is disconnected in a control circuit due to the normally closed point of the contactor, the attraction coil (2) loses power, the contactor is in a mechanical self-locking connection state, and the power consumption of the contactor during operation is zero;

And (C1) the contactor performs the breaking action:

step (C11), pressing a stop button, electrifying a disconnection coil (9), driving a fixture block (10) to move upwards by a second pressure spring (8) under the action of the magnetic force of the disconnection coil (9) to separate from a resistance block (11), and sliding a slide block (1) leftwards under the action of a tension spring (3) to return to the initial position;

step (C12), when the sliding block (1) slides leftwards, the moving contact (5) moves upwards under the action of the first pressure spring (7), so that the moving contact (5) is separated from the static contact (6), and the contactor is disconnected with the main circuit; in a control loop of the disconnecting coil (9), because the contactor is disconnected, a normally open contact of the contactor is also disconnected, and the disconnecting coil (9) loses power;

the loop power failure control mode is executed when the sudden loop of the contactor in a stable state loses power after the contactor performs the attraction action, and comprises the following steps,

step (D1), when the contactor is in a connection state, the power supply is controlled to lose power due to some reason, at the moment, the voltage relay KA in the control loop loses voltage, and the normally closed contact of the voltage relay KA is closed;

step (D2), the coil (9) is disconnected to connect a loop of the energy storage capacitor C, a power supply stored in the energy storage capacitor C enables the coil (9) to be disconnected to act, the fixture block (10) is attracted to move upwards, and the fixture block (11) on the sliding block (1) is unlocked;

And (D3) under the action of the tension spring (3), the slide block (1) returns to the initial position, and the movable contact (5) is disconnected with the static contact (6) along with the initial position.

Technical Field

The invention relates to the technical field of contactors, in particular to a micro-power-consumption mechanical bistable contactor and a control method thereof.

Background

The contactor is an electric appliance which utilizes a coil to flow current to generate a magnetic field in industrial electricity to close a contact so as to control a load.

When the conventional contactor is used at present, a moving contact and a static contact can be kept to be in long-time contact only by keeping the circuit connected, so that the defects of large power consumption, electric maintenance and the like of the contactor are caused.

Disclosure of Invention

The invention mainly aims to provide a micro-power mechanical bistable contactor and a control method thereof, so that the contactor only consumes electric energy instantly during the closing or opening action, and the contactor can achieve zero consumption of the electric energy during the closing and opening steady state.

The purpose of the invention can be achieved by adopting the following technical scheme:

a micro-power consumption mechanical bistable contactor comprises an electric control unit and a mechanical linkage unit, wherein the electric control unit is used for controlling the mechanical linkage unit to realize the actions of disconnecting, attracting and resetting the contactor when a loop is power off,

the electric control unit comprises a contactor body KM, a voltage relay KA and an energy storage capacitor C,

The contactor body KM is used for externally connecting control voltage and is connected with the mechanical linkage unit to realize disconnection, attraction and return circuit power-off reset actions;

the voltage relay KA is used for externally connecting control voltage, and forms a power-on loop with the energy storage capacitor C and the disconnecting coil of the contactor body KM when the loop loses power;

the energy storage capacitor C is used for externally connecting control voltage and storing energy, and triggers the disconnection action of the contactor body KM when forming a power-on loop with a disconnection coil of the contactor body KM;

and the mechanical linkage unit is internally provided with a suction locking mechanism, and the suction locking mechanism is used for mechanically keeping the stable state of the contactor after a suction action instruction sent by the electrical control unit is obtained.

Preferably, the contactor body KM comprises an attraction coil, a disconnection coil and a moving contact, and a static contact arranged below the moving contact, wherein the attraction coil is connected with an external control voltage through a fuse, a start button for switching on the control voltage is further arranged between the attraction coil and the fuse, the energy storage capacitor C is connected with the external control voltage through a diode, and the diode is connected with the external control voltage through the fuse.

Preferably, the power supply further comprises a fixing plate, the disconnecting coil is connected with the energy storage capacitor C through the voltage relay KA, the diode is connected with the disconnecting coil, and a stop button for disconnecting the control voltage is arranged between the diode and the disconnecting coil.

Preferably, the mechanical linkage unit comprises

The sliding block is arranged above the moving contact, and the tension spring is used for pulling the sliding block in one direction, and the sliding block is attracted to the other direction by the attraction coil to be used for extruding the moving contact so that the moving contact is attached to the static contact;

the first pressure spring is arranged on the bottom side of the moving contact and used for jacking the moving contact;

the clamping block is arranged at the bottom side of the disconnection coil, a second pressure spring is arranged between the clamping block and the disconnection coil and used for pressing the clamping block downwards, and the disconnection coil is used for attracting the clamping block;

and a stop block is fixed on the top side of the sliding block, the stop block and the clamping block are mutually attached and used for clamping the position of the sliding block, so that the sliding block extrudes the moving contact, and the second pressure spring, the clamping block and the stop block form the attraction locking mechanism.

Preferably, still include the fixed plate, the fixed plate is used for fixing the one end of extension spring, the other end of extension spring is fixed in the left end of slider, the actuation coil set up in the right-hand side of slider.

Preferably, the upper surface of the block is an inclined surface, the side surface of the block is a vertical surface, the bottom side surface of the fixture block is an inclined surface, and the bottom side surface of the fixture block is parallel to the upper surface of the block.

Preferably, the bottom side surface of the sliding block is divided into a horizontal surface and an inclined surface positioned on the right side of the horizontal surface, and the horizontal surface is used for extruding the moving contact.

A control method of a micro-power consumption mechanical bistable contactor comprises a normal operation control mode and a loop power failure control mode,

the normal operation control mode includes the steps of,

step (a 1), the contactor is in the initial state:

when the attraction coil does not act, the slide block is in a left end static state under the action of the tension spring, the moving contact is under the action of the first pressure spring to separate the moving contact from the static contact, and the contactor is in a disconnected state;

actuation;

step (B1), the contactor performs pull-in action:

step (B11), pressing the start button, electrifying the attraction coil, and sliding the attraction slide block rightwards under the action of the magnetic force of the attraction coil;

Step (B12), in the process that the sliding block slides rightwards, the bottom side of the sliding block presses the moving contact downwards to enable the moving contact to overcome the acting force of the first pressure spring, so that the moving contact is contacted with the static contact, and the main circuit is switched on;

step (B13), in the process that the sliding block slides rightwards, a fixture block above the sliding block goes over the fixture block on the top side of the sliding block, the fixture block is clamped with the fixture block under the action of a second pressure spring, and the sliding block is locked at the position where the moving contact is connected with the static contact; the attraction coil is disconnected in the control circuit due to the normally closed point of the contactor, the attraction coil loses power, the contactor is in a mechanical self-locking connection state, and the power consumption of the contactor in operation is zero;

and (C1) the contactor performs the breaking action:

step (C11), pressing a stop button, electrifying a disconnecting coil, driving a clamping block to move upwards by a second pressure spring under the action of magnetic force of the disconnecting coil, separating from the blocking block, sliding the sliding block leftwards under the action of a tension spring at the moment, and returning to the initial position;

step (C12) when the sliding block slides leftwards, the moving contact moves upwards under the action of the first pressure spring to separate the moving contact from the static contact, so that the contactor is disconnected with the main circuit; in the control loop of the disconnecting coil, due to the disconnection of the contactor, the normally open contact KM4 of the contactor is also disconnected, and the disconnecting coil loses power;

The loop power failure control mode is executed when the sudden loop of the contactor in a stable state loses power after the contactor performs the attraction action, and comprises the following steps,

step (D1), when the contactor is in a connection state, the power supply is controlled to lose power due to some reason, at the moment, the voltage relay KA in the control loop loses voltage, and the normally closed contact of the voltage relay KA is closed;

step (D2), the coil is disconnected to connect the loop of the energy storage capacitor C, the power stored in the energy storage capacitor C enables the coil to be disconnected to act, the fixture block is attracted to move upwards, and the fixture block on the sliding block is unlocked;

and (D3) under the action of the tension spring, the slide block returns to the initial position, and the moving contact is disconnected with the fixed contact.

The invention has the beneficial technical effects that:

the pull-in locking mechanism provided by the invention can mechanically maintain the pull-in state of the contactor under the control of the electric control unit, so that the contactor only consumes electric energy when being instantly connected or instantly disconnected, and then does not consume electric energy when being maintained in the connected state or after being disconnected, thereby reducing the use power consumption of the contactor.

Drawings

Fig. 1 is a schematic view of a contactor on state according to an embodiment of the present invention;

FIG. 2 is a schematic view of an open state of a contactor according to an embodiment of the invention;

fig. 3 is a schematic diagram of a contactor circuit connection according to an embodiment of the present invention.

In the figure: 1-sliding block, 2-attraction coil, 3-tension spring, 4-tension spring fixing plate, 5-moving contact, 6-static contact, 7-first pressure spring, 8-second pressure spring, 9-disconnection coil, 10-clamping block and 11-blocking block.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1-3, the micro-power mechanical bistable contactor provided in this embodiment includes an electrical control unit and a mechanical linkage unit, the electrical control unit is configured to control the mechanical linkage unit to implement the actions of disconnecting, closing, and resetting when the circuit is powered off,

the electric control unit comprises a contactor body KM, a voltage relay KA and an energy storage capacitor C,

the contactor body KM is used for externally connecting control voltage and is connected with the mechanical linkage unit to realize the actions of disconnection, attraction and power-off resetting of a loop;

The voltage relay KA is used for externally connecting control voltage, and is used for enabling the electric control unit to form a power-on loop by the energy storage capacitor C and the disconnecting coil of the contactor body KM when the loop loses power;

the energy storage capacitor C is used for externally connecting control voltage and storing energy, and triggers the disconnection action of the contactor body KM when forming a power-on loop with a disconnection coil of the contactor body KM;

and the mechanical linkage unit is internally provided with an attraction locking mechanism, and the attraction locking mechanism is used for mechanically keeping the attraction stable state of the contactor after acquiring an attraction action instruction sent by the electrical control unit and is used for realizing zero steady-state electrical consumption of the contactor, namely the contactor is in a mechanical self-locking connection state.

In this embodiment, as shown in fig. 1, the contactor body KM includes an attraction coil 2, a disconnection coil 9, a moving contact 5, and a static contact 6 disposed below the moving contact 5, the attraction coil 2 is connected to an external control voltage through a fuse, a start button for connecting the control voltage is further disposed between the attraction coil 2 and the fuse, the energy storage capacitor C is connected to the external control voltage through a diode, and the diode is connected to the external control voltage through the fuse.

In the present embodiment, as shown in fig. 1, the breaking coil 9 is connected to the energy storage capacitor C through a voltage relay KA, the diode is connected to the breaking coil 9, and a stop button for breaking the control voltage is provided between the diode and the breaking coil 9.

In the present embodiment, as shown in fig. 1 and 2, the mechanical linkage unit includes

The sliding block 1 is arranged above the moving contact 5, the tension spring 3 is used for pulling the sliding block 1 in one direction, the sliding block 1 is attracted by the attraction coil 2 in the other direction and is used for extruding the moving contact 5, and the moving contact 5 is attached to the static contact 6;

the first pressure spring 7 is arranged at the bottom side of the moving contact 5, and the first pressure spring 7 is used for jacking the moving contact 5;

and the fixture block 10 is arranged at the bottom side of the breaking coil 9, a second pressure spring 8 is arranged between the fixture block 10 and the breaking coil 9, the second pressure spring 8 is used for pressing the fixture block 10 downwards, and the breaking coil 9 is used for attracting the fixture block 10.

A block 11 is fixed on the top side of the sliding block 1, the block 11 and the fixture block 10 are mutually attached to clamp the position of the sliding block 1, so that the sliding block 1 extrudes the moving contact 5, and the second pressure spring 8, the fixture block 10 and the block 11 form a suction locking mechanism.

In this embodiment, as shown in fig. 1 and 2, the slider further includes a fixing plate, the fixing plate is used for fixing one end of the tension spring 3, the other end of the tension spring 3 is fixed to the left end of the slider 1, and the attraction coil 2 is disposed on the right side of the slider 1.

In this embodiment, as shown in fig. 2, the upper surface of the stopper 11 is an inclined surface, the side surface of the stopper 11 is a vertical surface, the bottom side surface of the latch 10 is an inclined surface, and the bottom side surface of the latch 10 and the upper surface of the stopper 11 are parallel to each other.

In this embodiment, as shown in fig. 3, the top end of the movable contact 5 is slidably connected to the bottom side surface of the slider 1, the fixture block 10 is slidably connected to the upper surface of the slider 1 and the upper surface of the stop block 11, respectively, the top end of the movable contact 5 is slidably connected to the bottom side surface of the slider 1, in order to smoothly press the movable contact 5 downward, the bottom side surface of the slider 1 is divided into a horizontal surface and an inclined surface located on the right side of the horizontal surface, the horizontal surface is used for pressing the movable contact 5, when the inclined surface is located above the movable contact 5, the movable contact 5 is lifted upward by the first pressure spring 7 to be separated from the fixed contact 6, and both the slider 1.

In the present embodiment, as shown in fig. 1, the bottom side surface of the slider 1 is divided into a horizontal surface for pressing the movable contact 5 and an inclined surface located on the right side of the horizontal surface.

In the present embodiment, as shown in fig. 1 to 3, the control method of the micro power consumption mechanical bistable contactor includes a normal operation control mode and a loop power failure control mode,

a normal operation control mode, comprising the steps of,

step (a 1), the contactor is in the initial state:

when the attraction coil 2 does not act, the slide block 1 is in a left end static state under the action of the tension spring 3, the moving contact 5 is under the action of the first pressure spring 7, so that the moving contact 5 is separated from the static contact 6, and the contactor is in a disconnected state;

Actuation;

step (B1), the contactor performs pull-in action:

step (B11), the start button is pressed, the attraction coil 2 is electrified, and the attraction slide block 1 slides rightwards under the action of the magnetic force of the attraction coil 2;

step (B12), in the process that the sliding block 1 slides rightwards, the bottom side of the sliding block 1 presses the moving contact 5 downwards, so that the moving contact 5 overcomes the acting force of the first pressure spring 7, and the moving contact 5 is contacted with the static contact 6, thereby connecting the main circuit;

step (B13), in the process that the sliding block 1 slides rightwards, the fixture block 10 above the sliding block 1 goes over the stop block 11 on the top side of the sliding block 1, and the fixture block 10 is clamped with the stop block 11 under the action of the second pressure spring 8, so that the sliding block 1 is locked at the position where the moving contact 5 is connected with the static contact 6; the attraction coil 2 is disconnected due to the normally closed point of the contactor in the control circuit, the attraction coil 2 loses power, the contactor is in a mechanical self-locking connection state, and the power consumption of the contactor in operation is zero;

and (C1) the contactor performs the breaking action:

step (C11), pressing a stop button, electrifying a disconnecting coil 9, driving a fixture block 10 to move upwards by a second pressure spring 8 under the action of the magnetic force of the disconnecting coil 9, separating from a fixture block 11, and sliding the slide block 1 leftwards under the action of the tension spring 3 to return to the initial position;

Step (C12), when the slide block 1 slides leftwards, the moving contact 5 moves upwards under the action of the first pressure spring 7, so that the moving contact 5 is separated from the static contact 6, and the contactor is disconnected with the main circuit; in the control loop of the disconnecting coil 9, due to the disconnection of the contactor, the normally open contact KM4 of the contactor is also disconnected, and the disconnecting coil 9 loses power;

the circuit power failure control mode is executed when the sudden circuit of the contactor in a stable state is powered off after the contactor performs the attraction action, and comprises the following steps,

step (D1), when the contactor is in a connection state, the power supply is controlled to lose power due to some reason, at the moment, the voltage relay KA in the control loop loses voltage, and the normally closed contact of the voltage relay KA is closed;

step (D2), the coil (9) is disconnected to connect a loop of the energy storage capacitor C, a power supply stored in the energy storage capacitor C enables the coil (9) to be disconnected to act, the fixture block (10) is attracted to move upwards, and the fixture block (11) on the sliding block (1) is unlocked;

and (D3) under the action of the tension spring (3), the slide block (1) returns to the initial position, and the movable contact (5) is disconnected with the static contact (6) along with the initial position.

In this embodiment, as shown in fig. 3, KM1 is a normally closed contact of a contactor, KM2 is a pull-in coil, KM3 is a break-off coil, KM4 is a normally open contact of the contactor, FU is a fuse, SB1 is a start button, SB2 is a stop button, D is a diode, KA1 is a normally closed contact of a voltage relay, and KA2 is a voltage relay.

In the embodiment, the main circuit supplies power to the control circuit through the fuse, when the start button is pressed, the pull-in coil 2 is powered on to act, so that the contactor is switched on, after the contactor is switched on, the normally closed contact KM1 in the start loop is switched off, the pull-in coil 2 is powered off after the contactor is started, and the contactor is in a self-holding state by the pull-in locking mechanism;

when the stop button is pressed down, the disconnecting coil 9 is electrified to act, so that the attraction locking mechanism is unlocked, the slide block 1 is quickly reset, and the contactor returns to the disconnected state;

when the contactor returns to the open state, the normally open contact KM4 in the opening coil 9 is also opened, and the opening coil 9 loses power.

When the contactor is in an operating state, the control loop loses power due to some reason, the voltage relay KA in the loop loses voltage, the normally closed contact KA1 of the voltage relay KA is connected, the loop of the disconnecting coil 9 and the energy storage capacitor C is connected, the disconnecting coil 9 is electrified, the attraction locking mechanism is unlocked, the sliding block 1 returns to an initial reset state, and the contactor returns to a disconnected state.

In summary, in this embodiment, the attraction locking mechanism provided in this embodiment can mechanically maintain the attraction state of the contactor under the control of the electrical control unit, so that the contactor consumes electric energy only when being instantly connected or instantly disconnected, and then does not consume electric energy when maintaining the connection state or after being disconnected, thereby reducing the power consumption of the contactor.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.