Intelligent AC contactor control unit based on current-variable control

Abstract

The utility model relates to an intelligent AC contactor control unit based on variable current controlling, which comprising an anti-interference rectification filter module, a contactor coil and an MOSFET module, which are electrically connected in turn with the AC input power supply. Wherein, the output terminal of the anti-interference rectification filter module is connected with a central processing unit via a voltage current sample / isolation module; the central processing unit is connected with the input terminal of the MOSFET module via the isolation drive circuit; and an output terminal of the anti-interference rectification filter module is connected with the internal power module; the internal power module is electrically connected with the voltage current sample / isolation module, the isolation driving circuit and the central processing unit respectively. Due to real-time adjusting and holding the stage coil current and consumed power with the feedback samples collected via the voltage / current isolation module, the control unit can make the contactors keep the same action performance at different voltage class and realize stable operation with low power consumption in the holding period.

Description

technical field [0001] The invention belongs to the field of electronic applications, in particular to an intelligent AC contactor control unit based on variable current control. Background technique [0002] AC contactor is a low-voltage electrical appliance that is frequently operated. It is often used in electrical appliances that frequently connect and disconnect AC and DC main circuits and large-capacity control circuits over a long distance. It is widely used in low-voltage circuits. Its main action features are: after the control power is turned on, the electromagnetic system drives the contact system to move to complete the closing process; after the control power is cut off, the moving and static contacts are separated by the reaction force spring. [0003] When the contactor control power is turned on, the moving iron core overcomes the reaction force generated by the reaction force spring and the contact spring under the action of the electromagnet to drive the mo...

AI Technical Summary

Problems solved by technology

However, due to the currently used control method, the contactor uses the same voltage for control in both the suction and holding states, which will cause a large waste of energy

The average energy consumption of each contactor is tens of watts, but the consumption of the contactor is huge. At present, there are tens of millions of contactors with different capacities in operation in the national industrial system, so the total energy consumption is very huge

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