CN204067197U - A contactor, a contactor assembly and a control circuit - Google Patents

Abstract

The utility model discloses a kind of contactor, contactor assembly and control circuit, contactor comprises switching mechanism, iron core and iron core position measurement circuit, iron core position measurement circuit comprises: pumping signal produces circuit and sensing circuit, and sensing circuit judges the position of iron core according to different inductance value; Control circuit, for the operation of control contactor, contactor comprises switching mechanism and iron core, and the surrounding of iron core is surrounded with coil drive iron core and does back and forth movement, thus performance loop is switched on or switched off, control circuit comprises working control circuit, iron core position measurement circuit, controller etc.The utility model control circuit utilizes the diverse location of iron core in coil that coil can be made to produce this characteristic of different inductance, is measured the position of iron core by the variable quantity measuring this inductance.

Description

A contactor, a contactor assembly and a control circuit

technical field

The utility model relates to a contactor, a contactor assembly and a control circuit, and more particularly relates to a contactor and a control circuit for sensing the change of the coil inductance in the contactor as the position of the iron core changes. the

Background technique

Contactors or relays are usually used to switch or control working circuits. For example, the contactor is provided with a coil and dynamic and static contacts. When current passes through the coil of the contactor, a magnetic field can be generated to close the dynamic and static contacts to control the electrical appliances of the load. the

Due to frequent switching on and off, the current conduction contacts of high-voltage and high-current contactors or relays will cause welding adhesion due to reasons such as overcurrent, high-temperature arc damage, or long-term application aging, so that the moving contacts of contactors or relays Ineffective out of control. For low voltage relays or contactors, general circuits can simply monitor this failure directly from the circuit. But for high-voltage and high-current contactors, it is inconvenient to directly monitor the circuit. the

Generally, in the industry, an auxiliary contact is connected in parallel to the movable contact end of the contactor and is insulated from the main contact, and then the on-off of the main contact is judged by monitoring the on-off of the auxiliary contact. In addition, the industry also adds a non-contact magnetic Hall switch to sense the position or on-off of the main contact. Although these methods are simple for customers to use, the cost of contactors and product maintenance costs are relatively high, and the magnetic Hall switch is also susceptible to interference from magnetic lines of force when the relay or contactor conducts a large current, which cannot meet the requirements of contactor control. need. Moreover, with the increase of various control functions of the contactor, there are higher requirements for the effective control of its contacts. the

Contents of the invention

One of the purposes of this utility model is to solve above certain problem, provide a kind of contactor, contactor assembly and the control circuit supporting it. The utility model specifically includes the following contents:

A control circuit for controlling the operation of a contactor, the contactor includes an iron core and a coil surrounding the iron core; the control circuit includes an iron core position measurement circuit, and the iron core position measurement circuit includes:

The excitation signal generating circuit is connected with the coil, and can output an excitation signal to the coil, so that the coil generates inductance, and the coil generates different inductance values along with the different positions of the iron core;

A sensing circuit connected to the coil for measuring the inductance generated by the coil;

The sensing circuit judges the position of the iron core according to different inductance values. the

as well as

The first type of contactor, the contactor has a coil, and also includes:

In the aforementioned control circuit, the control circuit is connected to the coil. the

as well as

A contactor assembly comprising the aforementioned contactor; and

Connector;

The control circuit is arranged on the connector and integrally connected with the connector. the

as well as

A connector on which a control circuit is provided, the control circuit can be connected to a coil in a contactor for controlling the operation of the contactor; the control circuit includes an operation control circuit for supplying an operation current to the contactor ;

The work control circuit includes:

PWM power-saving circuit, the PWM power-saving circuit is connected to the contactor;

When the contactor is turned on, the PWM power-saving circuit provides a signal with a preset duty ratio to the contactor;

After the contactor is turned on, the PWM power saving circuit provides a signal with a small duty ratio to the contactor to reduce power consumption while maintaining the on state of the contactor. the

as well as

A connector and contactor assembly, including a contactor, the contactor has a coil, and the contactor also includes:

In the aforementioned connector, the control circuit is connected to the coil. the

The beneficial technical effect of the utility model includes but not limited to:

1. The utility model utilizes the characteristic that different positions of the iron core in the coil will cause the coil to produce different inductances, and measures the position of the iron core by measuring the variation of the inductance. The circuit structure is simple and the sensing is accurate. the

2. The excitation signal generating circuit of the present invention outputs an excitation signal to the coil every time the working circuit is disconnected, and the sensing circuit senses the position of the iron core to judge whether the contacts are stuck, thereby enhancing the reliability of the contactor. the

3. The utility model transfers the working control circuit from the contactor or inside to the connector, avoiding the electromagnetic interference inside the contactor to the working circuit, and at the same time releasing the limited space of the contactor, improving the overall protection of the contactor The grade expands the physical limitations of the contactor, enhances its heat dissipation and reduces the volume of the contactor. the

4. The utility model is equipped with an iron core position measurement circuit and a work control circuit, and the working state and detection state of the contactor can be controlled by selecting the circuit, so as to ensure that the contactor is in a safe working state. the

5. The utility model integrates an I/O bus (such as LIN bus transmission protocol, etc.) on the connector, which can not only achieve the mutual communication of each circuit in the control circuit, but also ensure the effective communication between the contactor and the outside world, and facilitate integration other apps. the

6. The utility model integrates the PWM power-saving circuit on the connector, which not only reduces the average driving current of the contactor, but also reduces the volume of the contactor itself. the

Description of drawings

Fig. 1 is the schematic diagram of the circuit structure of contactor 20 in the utility model first embodiment;

Fig. 2 is a schematic diagram of the circuit structure of the contactor 20 in the second embodiment of the utility model;

Figure 3A is a schematic diagram of the internal structure of the utility model contactor 20 when the dynamic and static contacts are in contact;

Figure 3B is a schematic diagram of the internal structure when the dynamic and static contacts of the utility model contactor 20 are separated;

Fig. 4A is a schematic diagram of the contact position where the dynamic and static contacts of the contactor 20 do not stick together;

Fig. 4B is the schematic diagram of the contact position after the dynamic and static contacts of the contactor 20 are stuck; and

Fig. 5 is the schematic diagram of two charging curves of the coil 22 when the iron core 24 is in the normal position in Fig. 4A and the abnormal position in Fig. 4B; With

FIG. 6 is a schematic diagram of the circuit structure of the contactor assembly 100 in the third embodiment of the present invention. the

Detailed ways

Reference will now be made to specific embodiments, examples of which are illustrated in the accompanying drawings. In the detailed description of particular embodiments, directional terms such as "top", "bottom", "above", "below", "left", "right", etc. are used with reference to the directions described in the drawings. Since components of embodiments of the present invention may be arranged in many different orientations, directional terms are used for illustrative purposes and are by no means limiting. Wherever possible, the same or similar numbers and symbols will be used throughout the drawings to refer to the same or like parts. the

FIG. 1 is a schematic diagram of the circuit structure of the contactor 20 in the first embodiment of the present invention. the

As shown in FIG. 1 , the contactor (or relay) 20 includes a control circuit 10 connected to the contactor 20 . The contactor 20 has a contactor housing 21 (see FIGS. 3A-3B ), and the housing 21 is provided with terminals 23 connected to a working circuit. The casing 21 is provided with a coil 22 , an iron core 24 , a switch mechanism 26 and dynamic and static contacts 28 and 29 . The static contact 29 is connected with the terminal 23 on the contactor housing 21 to form a working circuit. In one embodiment of the present invention, the iron core 24 of the contactor 20 is surrounded by a coil 22 . When the coil 22 is energized (or de-energized), a magnetic force is generated (or disappears) to drive (or attract) the iron core 24 to move back and forth (when the coil 22 is de-energized, it is pushed by the release spring), so that the dynamic and static contacts inside the contactor 20 28 , 29 contact or separate, thereby closing or opening the switching mechanism 26 . The closing or opening switch mechanism 26 is used to control the on or off of the working circuit. the

The control circuit 10 includes a controller 15, an iron core position measurement circuit 16, a selection circuit 17, a work control circuit 18, and an I/O bus 19 (such as a LIN bus, etc.). The controller 15 is provided with an MCU (Micro Control Unit, micro control unit) control unit or other control units. The core position measurement circuit 16 is connected to the coil 22 in the contactor 20 and includes an excitation signal generating circuit 162 and a sensing circuit 164 . The working control circuit 18 is connected to the coil 22 in the contactor 20 and includes a PWM (Pulse Width Modulation, pulse width modulation) power saving circuit 184 and a power management circuit 182 . The controller 15 is connected to the iron core position measurement circuit 16, the selection circuit 17 and the operation control circuit 18 at the same time, and controls the working status and the signal communication between the iron core position measurement circuit 16, the selection circuit 17 and the operation control circuit 18. The iron core position measurement circuit 16 and the operation control circuit 18 are connected to the contactor 20 through the selection circuit 17 . The I/O bus 19 is connected to the controller 15 to realize high-speed communication between the contactor 20, the controller 15, the selection circuit 17, the iron core position measurement circuit 16 and the work control circuit 18, etc. and the outside world. the

The selection circuit 17 is connected to the iron core position measurement circuit 16 and the work control circuit 18. According to the instruction of the controller 15, the selection circuit 17 will work the control circuit 18 (operating state) and the iron core position sensing circuit 16 in different time divisions. (Detection state) is switched to the connection with the coil 22 . For example, when the work control circuit 18 is to enter into the working state, the selection circuit 17 closes the work control circuit 18, disconnects the iron core position sensing circuit 16, and the controller 15 sends an instruction to make the work control circuit 18 supply power to the coil 22 to form a In the working circuit, the coil 22 is energized to generate magnetic force, and the iron core 24 is pushed to move to contact the movable contact 28 inside the contactor 20 with the static contact 29 (see Fig. 3A, Fig. 3B ), close the switch mechanism 26, and turn on the working circuit to work. the

When it is necessary to detect the position of the iron core 24 so that the iron core position sensing circuit 16 enters the detection state, the selection circuit 17 disconnects the work control circuit 18, closes the iron core position sensing circuit 16, and the iron core position sensing circuit 16 closes It forms a loop with the coil 22 and the sensing circuit 164; at this time, the controller 15 sends an instruction to the excitation signal generating circuit 162 to generate a pulse detection signal and send it to the coil 22, and then the sensing circuit 164 detects the pulse detection signal returned by the coil 22 (excitation signal), and judge whether the self-inductance of the coil 22 changes according to the returned pulse detection signal, so as to detect whether the iron core 24 of the contactor 20 has displacement. the

When in the working state, the controller 15 instructs the selection circuit 17 to close the working control circuit 18 and the coil 22, and disconnect the iron core position sensing circuit 16. The working control circuit 18 is connected to the coil 22 to form a loop. At the moment of starting the iron core 24, the controller 15 sends an instruction to the power management circuit 182, and outputs a starting current with a preset duty ratio to the coil 22 through the PWM power saving circuit 184. The signal drives the iron core 24 so that the contactor 20 is connected to the high-voltage working circuit. After that, the controller 15 sends an instruction to the power management circuit 182, and provides a stable duty-ratio small operating current through the PWM power-saving circuit 184, so that the contactor 20 Stay connected. During this process, the power management circuit 182 controls the working state of the PWM power saving circuit 184, and at the same time effectively distributes the voltage from the power supply port 151 (see FIG. The instruction of the controller 15 works. The contactor 20 does not need a high-energy electrical signal to maintain the on-state in the working state, and the contactor 20 can work for a long time by providing a working current smaller than the duty ratio of the starting current to reduce energy consumption and save electricity. the

In the working state, during the working process of the contactor 20, long-term high-voltage energization may cause the moving contact 28 at the far end of the iron core 24 to weld and stick to a pair of static contacts 29, so when the driving current is disconnected, the coil 22 is powered off , the magnetic force disappears, the iron core 24 cannot bounce back to the initial position, and the contactor 20 fails. In another situation, the movable contact 28 does not adhere to the pair of static contacts 29, but the iron core 24 is engaged in the springback path and does not return to the initial position. At this time, the contactor 20 is also in an abnormal position. In these two situations, since the position of the iron core 24 has changed relative to the initial position, the self-inductance of the coil 22 will change relative to the initial position of the iron core 24 . the

In the detection state, the command selection circuit 17 of the controller 15 closes the iron core position measurement circuit 16 and the coil 22 , and the selection circuit 17 disconnects the work control circuit 18 . The excitation signal generating circuit 162 is connected to the coil 22 and the sensing circuit 164 to form a loop. The excitation signal generating circuit 162 outputs an excitation signal to the coil 22 , so that the coil 22 generates inductance, and the sensing circuit 164 measures the inductance value fed back from the coil 22 . Along with the different positions of the iron core 24, the coil 22 produces different inductance values; the sensing circuit 164 judges the position of the iron core 24 according to different inductance values, and starts the different position states measured to the controller 15 through I\ O bus output, or output by the control detection output terminal 152. the

The principle of the position detection of the iron core 24 is: when the iron core 24 is in an abnormal position (including bonding), the self-inductance coefficient of the coil 22 will be affected because the position of the iron core 24 is different from the initial position, and the coil 22 will produce a different inductance from the initial position. value, the charging and discharging time of coils with different inductance values is different, the excitation signal generating circuit 162 outputs an excitation signal to the coil 22 to charge the coil 22, because the self-inductance coil 22 will discharge, and the sensing circuit 164 passes through the receiving coil 22- The charging and discharging time can determine the self-inductance of the coil, and the position of the iron core 24 can be determined by comparing different inductance values. During this process, an external working power supply 40 (as shown in FIG. 2 ) provides power, and the controller 15 sends the power from the working power supply 40 to the coil 22 as an exciting signal by controlling the excitation signal generating circuit 162 . the

In Fig. 1, the I/O bus 19, the controller 15, the contactor 20, the selection circuit 17, the iron core position measurement circuit 16 and the work control circuit 18, etc. included in the control circuit 10 are all arranged on the printed circuit board. The board is installed on the connector 60 (see FIG. 6 ), and the control circuit 10 is connected to the coil 22 of the contactor 20 through plug-ins (such as 141 and 142 in FIG. 2 and FIG. 6 ). In fact, other types of communication bus protocols are also suitable, such as CAN bus. the

Prior to this, due to the difficulty of opening the contactor mold (cost) and the limitations of chip technology, all control circuits were integrated inside the contactor. This method will result in a larger contactor and poor heat dissipation. The control circuit generates electromagnetic interference; with the breakthrough of the mold opening process, the development of chip technology and the trend of contactor design, the working control circuit is set in the connector, which avoids the electromagnetic interference of the working line inside the contactor At the same time, it releases the limited space of the contactor, expands the physical limitations of the contactor, enhances its heat dissipation, reduces the volume of the contactor, and enhances its waterproof performance. More importantly, it will require different customized functions. It is integrated on the connector, and the appearance and model of the contactor itself are unified to facilitate the use of different manufacturers' needs. the

FIG. 2 is a schematic diagram of the circuit structure of the contactor 20 in the second embodiment of the present invention. the

As shown in FIG. 2 , the contactor (or relay) 20 includes a control circuit 10 connected to the contactor 20 . The control circuit 10 is connected with the coil 22 of the contactor 20 through plug-ins (141, 142). The control circuit 10 includes a controller 15, an iron core position measurement circuit 16, a selection circuit 17, a work control circuit 18, an I/O bus 19, a work Power 40 etc. Wherein the contactor 20, the controller 15, the iron core position measuring circuit 16, the working control circuit 18, the I/O bus 19, and the working power supply 40 are the same in structure and function as the first embodiment, and will not be repeated here. the

The difference from the first embodiment is the structure and working mode of the selection circuit 17 : the structure of the selection circuit 17 includes a first diode 190 and a second diode 192 . The first diode 190 is connected between the output end of the PWM power saving circuit 184 and the input end of the coil 22, the anode of the first diode 190 is connected with the output end of the PWM power saving circuit 184, and the first diode 190 The negative pole of the second diode 192 is connected to the input end of the coil 22; the second diode 192 is connected between the iron core position measuring circuit 16 and the input end of the coil 22, and the positive pole of the second diode 192 is connected to the output of the excitation signal generating circuit 162, The cathode of the second diode 192 is connected to the input terminal of the coil 22 ; the output terminal of the coil 22 is connected to the input terminal of the PWM power saving circuit 184 and the input terminal of the sensing circuit 164 at the same time. the

Its working state is different from the first embodiment in FIG. 1 in that the second embodiment utilizes the one-way conductivity of the diode to control the iron core position measurement circuit 16 and the work control circuit. The work control circuit 18 is connected to the coil 22 . The specific description is as follows:

First, when the coil 22 needs to enter the working state to connect the working loop, the controller 15 sends an instruction to the working control circuit 18, and the power management circuit 182 controls the PWM power-saving circuit 184 to send a starting current with a preset duty cycle to start the contactor 20 , at this time, the start-up current flows to the input end of the coil 22 through the anode of the first diode 190 through the cathode of the first diode 190 through the output end of the PWM power-saving circuit 184, because the cathode of the second diode 192 is connected with the coil 22, so the start-up current It will not flow to the excitation signal generating circuit 162; the start-up current flows through the plug-in 141 through the coil 22 and then flows back to the input end of the PWM power-saving circuit 184 through the plug-in 142 to form a loop. After the iron core 24 is pushed to close the subsequent working loop, the controller 15 sends an instruction to the working control circuit 18 to change (decrease) the duty ratio of the output current of the PWM power saving circuit 184 to save power. When the working loop needs to be disconnected, the controller 15 sends an instruction to the working control circuit 18, and the power management circuit 182 controls the PWM power-saving circuit 184 to stop supplying current to the coil, and the working control circuit 18 stops working, so that the iron core 24 loses thrust and is released (spring) bounces back, and the moving and static contacts 28, 29 are separated, and the working circuit is disconnected. the

Then, when the iron core position measurement circuit 16 needs to enter the detection state, the controller 15 sends an instruction to the excitation signal generation circuit 162, and at the moment when the work control circuit 18 stops supplying power, the excitation signal generation circuit 162 sends an excitation signal to the coil 22 to activate The signal flows in from the positive pole of the second diode 192, and flows to the input terminal of the coil 22 through the negative pole. Because the negative pole of the first diode 190 is connected to the input terminal of the coil 22, the excitation signal will not flow to the coil 22 through the first diode 190. PWM node circuit 184, the excitation signal flows through the plug-in 141 through the coil 22 and then flows back to the input end of the sensing circuit 164 through the plug-in 142 to form a loop. The sensing circuit 164 senses the charging and discharging time of the coil 22 to measure the position of the iron core 24, and The position signal is fed back to the controller 15 through the detection state output, and then communicated with the external vehicle ECU through the I/O bus 19 . In the second embodiment, two unidirectional diodes are used to replace the selection circuit 17 in the first embodiment to directly control the time-sharing operation of the iron core position measurement circuit 16 and the work control circuit 18, which has a simpler structural design and lower manufacturing cost. the

The control circuit 10 in the second embodiment is arranged on the printed circuit board in the same way as the first embodiment, and the printed circuit board is arranged on the connector 60 (see Fig. 6 ), and the contactor is connected with the plug-in (141, 142). The coil 22 of 20 is connected. The connector 60 can adopt a variety of structures, and can load different functional circuits (or modules) according to different needs. Generally, a sealed or non-sealed separable plug-in with a printed circuit board is used. As long as the plug-in structure has enough space to accommodate the required PCB circuit board can be. the

3A-3B are schematic diagrams of the internal structure of the inventive contactor 20 . As shown in FIGS. 3A-3B , the contactor 20 includes a housing 21 and an iron core 24, the iron core 24 is arranged to move up and down (back and forth) in the piston 25, the coil 22 surrounds the periphery of the iron core 24, and the control circuit 10 ( As shown in FIG. 1-2 ), it is connected to the coil 22 through the wire 30 . The switch mechanism 26 provided on the far end of the iron core 24 is provided with a pair of movable contacts 28 on one side of the switch mechanism 26, and a pair of static contacts 29 are arranged on the working circuit, corresponding to the movable contacts 28. Housing 21 is provided with terminal 23 (again as Fig. 6), and terminal 23 is communicated with static contact 29, is used for external connection working circuit. the

As shown in FIG. 3A , when the operating current flows through the coil 22 , the coil 22 generates a magnetic field, and the iron core 24 is driven to move up to contact the movable contact 28 with the static contact 29 under the action of magnetic attraction. That is, when the coil 22 is energized, the iron core 24 moves to the static contact 29, the movable contact 28 contacts the static contact 29, and the working circuit controlled by the contactor 20 is connected. the

As shown in FIG. 3B , when the working current cuts off the coil 22 , the iron core 24 leaves the static contact 29 , and the movable contact 28 is disconnected from the static contact 29 , that is, the working circuit controlled by the contactor 20 is disconnected. The long-term energization of the working circuit will cause the moving contact 28 to stick to the static contact 29 (that is, the iron core 24 together). When the coil 22 is powered off, it cannot return to the normal position, the working circuit cannot be disconnected, and the contactor 20 fails. . In fact, even if the iron core 24 does not send adhesion, but has not fully returned to the original position, it can also be detected by the excitation signal generating circuit 162 and the sensing circuit 164 connected to the coil 22 . the

FIG. 4A is a schematic diagram of the contact position of the contactor 20 where the contacts are not stuck. As shown in Figure 4A, it includes an iron core 24, a coil 22 surrounding the iron core 24, a switch mechanism 26 at the far end of the iron core 24, a pair of movable contacts 28 on one side of the switch mechanism 26, and a pair of movable contacts 28 on the working circuit. When the movable contact 28 is connected to the corresponding pair of static contacts 29, the iron core 24 moves to contact the movable contact 28 and the static contact 29, and the working circuit is connected through the switch mechanism. If the working circuit is energized for a long time, the movable contact 28 and the static contact 29 will stick together and cannot be separated, resulting in the failure of the working circuit to disconnect and the failure of the contactor. In the figure, when the static contact 29 does not stick together, after the coil 22 is powered off, the iron core 24 returns to the initial position, driving the switch mechanism 26 to return, and the movable contact 28 and a pair of static contacts 29 on the side of the controlled device separate. the

FIG. 4B is a schematic diagram of the contact position of the contactor 20 after contact adhesion occurs. As shown in Figure 4B, the moving contact 28 is stuck to the static contact 29. After the coil 22 is powered off, the iron core 24 cannot return to the initial position. Still connected together, the current still flows in the working circuit, and the contactor 20 fails. the

FIG. 5 is a schematic diagram of two charging curves of the coil 22 when the iron core 24 is in a normal position as shown in FIG. 4A and an abnormal position as shown in FIG. 4B . the

The utility model can use various methods to measure the inductance. In this embodiment, the inductance is measured by measuring the charging and discharging time of the coil. As shown in Figure 5, under the normal state of the iron core 24 shown in Figure 4A, the iron core 24 can return to the normal position, the self-inductance coefficient of the coil 22 is relatively large, and the current changes slowly, and the charging time of the measured coil 22 It is t2, which can be set as the expected value. As shown in FIG. 4B , when the movable contact 28 is stuck, the self-inductance coefficient of the coil 22 is small, and the current changes quickly, and the measured charging time of the coil 22 is t1. If the charging time t2 of the coil 22 under the normal state of the movable contact 28 is specified, and set to the expected value; after that, the charging time t1 in the measured coil 22 is compared with the expected charging time t2, if the same or predetermined at the expected value Within the range, it is judged that the movable contact 28 is not stuck, and the iron core 24 is in a normal state. If it is different from the expected value or exceeds the predetermined range of the expected value, it is judged that the position of the iron core 24 is in an abnormal state, wherein, if the difference between t1 and t2 is at a maximum value, it can be judged that the movable contact 28 is stuck, and the abnormality between this state, it can be judged that the iron core 24 has not returned to the initial position, but no adhesion has occurred. the

The utility model utilizes the characteristic that the self-inductance coefficient of the coil will change due to different insertion positions of the iron core, applies it to sensing the position of the iron core itself, and designs a simple and easy to expand position sensing circuit, Not only the manufacturing cost and maintenance cost of the contactor are reduced, but also based on the circuit, the connector can also have the function of electronic power saving, and realize the level trigger or LIN bus (or other communication bus) control drive of the contactor , more convenient for customer applications. the

FIG. 6 is a schematic diagram of the circuit structure of the contactor assembly 100 in the third embodiment of the present invention. the

As shown in FIG. 6 , the contactor assembly 100 includes a contactor 20 and a connector 60 connected to the contactor 20 . The contactor 20 includes a coil 22 , an iron core 24 , a switch mechanism 26 , and a terminal 23 . The control circuit 10 (as shown in FIGS. 1-2 ) is connected to the coil 22 through a wire 30 . In the connector 60 (on or in), the control circuit 10 includes a power management circuit 182, a PWM power-saving circuit 184, a measurement circuit 164, an excitation signal generation circuit 162, a controller 15, an I/O bus 19, and a control detection output 152 wait. The control circuit 10 is detachably connected to the coil 22 of the contactor 20 through the plug-ins 141, 142; detachably concatenated; . The control circuit 10 is installed on the printed circuit board, and the printed circuit board is arranged on the connector 60 , and the printed circuit board and the coil 22 are detachably connected to each other through the connector 60 . The connector 60 can adopt a variety of structures, and can load different functional circuits (or modules) according to different needs. Generally, a sealed or non-sealed separable plug-in with a printed circuit board is used. As long as the plug-in structure has enough space to accommodate the required PCB circuit board can be. the

For those skilled in the art, various changes and modifications can be made to the embodiments described herein without departing from the spirit and scope of the present utility model. Therefore, this description is intended to cover various changes and modifications, if such changes and modifications within the scope of the appended claims and their equivalents. the

Claims (20)

1. A control circuit (10) is used to control the operation of a contactor (20), and the contactor (20) includes a coil (22) surrounding an iron core (24) and an iron core (24); it is characterized in that : Described control circuit (10) comprises iron core position measurement circuit (16), and described iron core position measurement circuit (16) comprises: The excitation signal generating circuit (162), connected with the coil (22), can output an excitation signal to the coil (22), so that the coil (22) generates inductance, and along with the different positions of the iron core (24), the coil ( 22) produce different inductance values; Sensing circuit (164), is connected with described coil (22), is used for measuring the inductance value that coil (22) produces; The sensing circuit (164) judges the position of the iron core (24) according to different inductance values. the 2. control circuit (10) according to claim 1, is characterized in that, also comprises: An operating control circuit (18), the operating control circuit (18) is connected to the coil (22), provides operating current to the coil (22), and connects the contactor (20) to close the operating loop. the 3. The control circuit (10) according to claim 2, characterized in that: The excitation signal generating circuit (162) outputs an excitation signal to the coil (22) when the working circuit is disconnected. the 4. The control circuit (10) according to claim 1, characterized in that: Comparing the measured inductance value with the expected value, if it is the same as the expected value or within the predetermined range of the expected value, it is judged that the position of the iron core (24) is normal; if it is different from the expected value or exceeds the predetermined range of the expected value, then it is judged that the The position of the iron core (24) is abnormal. the 5. The control circuit (10) according to claim 1, characterized in that: The sensing circuit (164) measures the inductance value of the coil (22) by measuring the charging and discharging time, so as to determine the position of the iron core (24). the 6. The control circuit (10) according to claim 1, characterized in that: The sensing circuit (164) determines the position of the iron core (24) by measuring the charge and discharge time difference formed by the inductance change generated by the coil (22). the 7. The control circuit (10) according to claim 2, characterized in that: The coil (22) provides an operating current through the operating control circuit (18) to drive the iron core (24) to move back and forth. the 8. control circuit (10) according to claim 2, is characterized in that, also comprises: A selection circuit (17), the selection circuit (17) is connected to the iron core position measurement circuit (16) and the work control circuit (18); When the selection circuit (17) is connected with the work control circuit (18), the contactor (20) remains connected; When the selection circuit (17) is connected to the iron core position measurement circuit (16), the iron core position measurement circuit (16) tests the inductance change value of the coil, thereby determining the position of the iron core (24). the 9. The control circuit (10) according to claim 1, characterized in that: The excitation signal generating circuit (162) sends an excitation signal when the coil (22) changes from a power-on state to a power-off state; The sensing circuit (164) determines the position of the core (24) when the coil (22) changes from an energized state to an de-energized state. the 10. The control circuit (10) according to claim 7, characterized in that: A switch mechanism (26) is arranged on the far end of the iron core (24), and a pair of movable contacts (28) are arranged on one side of the switch mechanism (26). the 11. The control circuit (10) according to claim 10, characterized in that: When the coil (22) is energized, the iron core (24) moves to a pair of static contacts (29), and communicates with the static contacts (29); When the coil (22) is de-energized, the iron core (24) leaves the static contact (29) and is disconnected from the static contact (29). the 12. The control circuit (10) according to claim 11, characterized in that: The sensing circuit (164) determines that the iron core (24) and the movable contact (28) are in an abnormal position or a normal separation position according to the inductance change amount of the coil (22). the 13. The control circuit (10) according to claim 12, characterized in that: The abnormal position of the iron core (24) and the movable contact (28) includes the bonding position of the movable contact (28) and the static contact (29). the 14. The control circuit (10) according to any one of claims 1-13, characterized in that: The iron core position measuring circuit (16) and the coil (22) are detachably connected to each other through a connector (60). the 15. The control circuit (10) according to any one of claims 1-13, characterized in that: The control circuit (10) is arranged on a printed circuit board, and the printed circuit board and the coil (22) are detachably connected to each other through a connector (60). the 16. A contactor (20), the contactor (20) has a coil (22), characterized in that the contactor (20) also includes: The control circuit (10) according to any one of claims 1-15, wherein the control circuit (10) is connected to the coil (22). the 17. The contactor (20) according to claim 16, characterized in that: Comprising a switch mechanism (26) and an iron core (24), the coil (22) surrounds the iron core (24), and drives the iron core (24) to move back and forth to close or disconnect the switch mechanism ( 26), so as to connect or disconnect the working circuit. the 18. A contactor assembly, characterized in that it comprises: The contactor (20) according to any one of claims 16-17; and connector(60); The control circuit (10) is arranged on the connector (60), and is integrally connected with the connector (60). the 19. The contactor assembly of claim 18, wherein: The control circuit (10) is arranged on a printed circuit board mounted on a connector (60). the 20. The contactor assembly of claim 18, wherein: The connector (60) is connected with the coil (22) through connectors (141, 142). the