CN206194648U - Controlling means of contactor - Google Patents

Abstract

The utility model provides a control device for a contactor. The control device includes a controller. The start signal input end and the stop signal input end of the contactor are short-circuited and then connected to the signal output positive end of the controller. The common terminal of the contactor is connected to the negative signal output terminal of the controller. The contactor control device of the utility model realizes direct and rapid control of the contactor, has a simple structure, few fault points and low cost.

Description

contactor control device

technical field

The utility model relates to the technical field of circuits, in particular to a control device for a contactor.

Background technique

Contactors are one of the most commonly used devices in circuits, and are widely used in electric power, power distribution and power consumption occasions. It mainly includes AC contactors and DC contactors. The working principle of the contactor is to use the coil to flow current to generate a magnetic field to close the contacts to achieve the purpose of controlling the load.

At present, the control device of the contactor is mainly realized through the cooperation of the controller and the intermediate relay. Fig. 1 is a schematic structural diagram of a control device of a contactor in the prior art. With reference to Fig. 1, the external wiring points of the contactor have ON, OFF, COM, PLC: A, PLC: B, A1 and A2, wherein ON is a start signal Input terminal, OFF is the stop signal input terminal, COM is the common terminal, PLC:A and PLC:B are the two control mode selection terminals of the contactor; W1 and W2 are the internal coil connection points of the contactor (no need to do any operate). The wiring method shown in Figure 1 is the power supply terminal control connection method. Specifically, ON, OFF and COM do not need wiring, and the contactor needs to select PLC: B control mode, after the first coil input terminal A1 of the contactor and the second coil input terminal A2 of the contactor are connected in series with the auxiliary contact of the intermediate relay K1 power supply. When the controller outputs high level, the intermediate relay K1 coil is energized, its auxiliary contact changes from open to closed, and the contactor coil is energized and closed; when the controller outputs low level, the intermediate relay K1 coil is de-energized, and its auxiliary The contact changes from a closed point to an open point, and the contactor coil is de-energized and disconnected.

However, the control device with the above structure has the following disadvantages: firstly, due to the long delay in the action of the intermediate relay, the main contact of the contactor cannot act in time, thereby prolonging the control time; secondly, the contacts of the intermediate relay are connected in series In the control loop of the contactor coil, the number of wiring points in the entire control loop increases, and accordingly, the number of fault points increases; again, the intermediate relay is used to indirectly control the contactor, and the cost of the intermediate relay increases the cost.

Utility model content

The purpose of the embodiments of the present invention is to provide a control device for a contactor to realize direct and fast control of the contactor, which has a simple structure, fewer failure points, and low cost.

In order to achieve the purpose of the above utility model, an embodiment of the utility model provides a control device for a contactor, the device includes: a controller, the start signal input end of the contactor is short-circuited with the stop signal input end and connected to the The signal output positive terminal of the controller, the common terminal of the contactor is connected with the signal output negative terminal of the controller.

Preferably, the controller is a programmable logic controller or a digital signal processor.

Preferably, the control mode of the contactor operation selects the controller connection method.

Preferably, the controller connection is a programmable logic controller (PLC) connection.

Preferably, the control device further includes: a power supply connected to the contactor.

Preferably, the power supply is an AC power supply or a DC power supply.

Preferably, the power supply is an uninterruptible power supply.

The control device of the contactor provided by the embodiment of the utility model connects the signal output positive terminal of the controller after short-circuiting the start signal input end of the contactor and the stop signal input end of the contactor, and connects the common end of the contactor to the controller's The negative terminals of the signal output are connected to each other, so that the controller can be used to directly and quickly control the contactor. Compared with the existing technology, because the intermediate relay is omitted, the circuit structure is simple, the cost is low, and the control time is shortened. point of failure.

Description of drawings

Fig. 1 is the structural representation of the control device of the contactor of prior art;

Fig. 2 is a schematic structural view of the control device of the contactor according to Embodiment 1 of the utility model;

Fig. 3 is another structural schematic diagram of the control device of the contactor according to the first embodiment of the present invention.

Explanation of reference numbers

110-controller, 120-contactor, 130-power supply, ON-contactor start signal input terminal, OFF-contactor stop signal input terminal, COM-contactor common terminal, PLC: A-contactor PLC connection control Mode, PLC: B-contactor power terminal connection method control mode, A1-contactor first coil input terminal, A2-contactor second coil input terminal, K1-intermediate relay, W1, W2-contactor internal coil connection point .

detailed description

The control device of the contactor according to the embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

Fig. 2 is a schematic structural diagram of a control device of a contactor according to Embodiment 1 of the present utility model. Referring to Fig. 2, the control device of the contactor includes: a controller 110, the start signal input terminal (ON as shown in the figure) and the stop signal input terminal (OFF as shown in the figure) of the contactor 120 are short-circuited and then connected to the controller The signal output positive terminal of 110 (control signal + as shown in the figure), the common terminal of contactor 120 (COM as shown in the figure) and the signal output negative terminal of controller 110 (control signal - as shown in the figure) connected.

It should be noted that the control mode for the contactor 120 to work selects the controller connection method. Optionally, the connection method of the controller is a programmable logic controller (PLC) connection method.

In practical applications, as shown in Figure 2, PLC:A and PLC:B are the contactor control mode selections, which are realized by dialing codes. Among them, the PLC:A control mode is used to represent the control mode of the PLC connection method, and the PLC:B control mode is used to represent the control mode of the power termination method. The PLC:B control mode is the traditional control connection, and the control mode of the above-mentioned controller connection is the PLC:A control mode.

Specifically, by directly connecting the pins of the contactor 120 and the pins of the controller 110 according to the above connection relationship, a control loop is formed between the two. That is, after ON and OFF are short-circuited externally, the positive of the control signal of the control loop is connected, and the negative of the control signal of the control loop is connected to COM, and the voltage of the control loop is 24V. After receiving the control signal inside the contactor 120, it outputs to the optocoupler switch through voltage stabilization control, triggering the closing signal of the single-chip microcomputer inside the contactor 120, and the voltage stabilization circuit can be turned on when the voltage stabilization circuit is above 15V. The voltage circuit is the internal circuit structure of the contactor, and the photocoupler switch, closing and voltage stabilizing circuit cooperate with each other to solve the problem of voltage level matching. The first coil input terminal A1 and the second coil input terminal A2 supply power to the coil of the contactor 120 , no matter whether the coil of the contactor 120 is in the closed state or the disconnected state, the power supply needs to be maintained all the time. When the contactor 120 is specifically applied, A1 and A2 are connected to the voltage required for the coil of the contactor to work. Select the PLC:A control mode, and complete the pull-in and disconnection of the coil of the contactor 120 by switching the level of the control signal (+), thereby realizing the control of the contactor 120 .

The control device can be applied in photovoltaic fields such as photovoltaic systems, photovoltaic inverters, etc., but is not limited thereto.

The control device of the contactor in the embodiment of the utility model connects the signal output positive terminal of the controller by shorting the start signal input end of the contactor and the stop signal input end of the contactor, and connects the common end of the contactor with the signal output of the controller. The output negative terminals are connected to each other, so that the controller can be used to directly and quickly control the contactor. Compared with the existing technology, because the intermediate relay is omitted, the circuit structure is simple and the cost is low. At the same time, the control time is shortened and the fault is reduced. point.

Further, the controller may be a programmable logic controller (Programmable Logic Controller, PLC) or a digital signal processor (Digital Signal Processing, DSP).

In practical applications, since the controller itself is provided with diodes, the reliability of the control device can be increased, thereby reducing control risks.

On the basis of the above embodiments, FIG. 3 is another structural schematic diagram of the control device of the contactor according to Embodiment 1 of the present utility model. Referring to FIG. 3 , compared with the device structure of the embodiment shown in FIG. 2 , a power supply module 130 is added in FIG. 3 .

In this embodiment, the control device for the contactor may further include: a power supply 130 connected to the contactor 120 .

Here, the power supply 130 may be an AC power supply or a DC power supply. Specifically, if the power supply is an AC power supply, then the phase line input terminal and the neutral line input terminal of the power supply 130 correspond to the two coil input terminals (A1 and A2 shown in FIG. 1 ) of the contactor 120 respectively. connection; if the power supply is a DC power supply, then the positive terminal and the negative terminal of the power supply 130 are connected to the two coil input terminals of the contactor 120 respectively.

Preferably, the power supply 130 may be an uninterruptible power supply, but not limited thereto.

Therefore, the control device of the contactor in the embodiment of the utility model also has the following technical effects: on the one hand, the contactor is controlled stably and reliably through PLC or DPS; on the other hand, in this embodiment, through the The power supply in the control device supplies power to the contactor, and the power supply can be either an AC power supply or a DC power supply, which is widely applicable; on the other hand, the uninterruptible power supply can provide stable and uninterrupted power supply in the event of a power failure. Intermittent electricity supply.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (7)

1. a kind of control device of contactor, it is characterised in that including controller, the enabling signal input of the contactor with The signal output anode of the controller, the common port of the contactor and the control are connected after stop signal input short circuit The signal output negative terminal of device is connected.

2. control device according to claim 1, it is characterised in that the controller is programmable logic controller (PLC) or number Word signal processor.

3. control device according to claim 1, it is characterised in that the control model selection control of the contactor work Device connection.

4. control device according to claim 3, it is characterised in that the controller connection is programmable logic controller (PLC) PLC connections.

5. the control device according to any one of claim 1-4, it is characterised in that the control device also includes：With The power supply that the contactor is connected.

6. control device according to claim 5, it is characterised in that the power supply is AC power or direct current Source.

7. control device according to claim 5, it is characterised in that the power supply is uninterrupted power source.