Zhejiang Chint Electrics Co., Ltd.

Seari Electric Technology Co., Ltd.

Yawen Shi

Di Zhang

Ping Zeng

Changxun Gu

Fei Yu

Shunfeng Ge

Yugang Feng

A controller for an alternating current contactor includes: a filtering and rectification circuit that filters and rectifies external alternating current; an electromagnet component driven by an output of the filtering and rectification circuit that performs actions of attraction, holding or releasing; a power transistor circuit connected to the electromagnet component; and a microcontroller that controls the power transistor circuit to control the actions performed by the electromagnet component. The controller further includes a voltage control loop that provides a voltage feedback signal and a current control loop that provides a current feedback signal to the microcontroller. The microcontroller generates a control signal according to the voltage feedback signal. The control signal is a PWM control signal having different duty cycles during the attraction and holding of the electromagnet component so that the current does not exceed a predetermined current threshold during the attraction and bolding of the electromagnet component.

Controller and control method for alternating current contactor

Growing community of inventors

Shanghai, China

Yawen Shi