Control circuit for contactor and its control method

A control method for a contactor, wherein the contactor comprises an excitation coil and a main contact coupled to the excitation coil, the control method comprising:

• receiving, by a pulse converter, a control signal indicating to turn on or off the contactor, and converting, by the pulse converter, the turn-on control signal indicating to turn on the contactor into a continuous pulse signal;
• in response to detection of the disappearance of the continuous pulse signal, generating, by a first controller, a first breaking control signal for a coil driver at a first time, wherein the coil driver is configured to drive the excitation coil;
• in response to detection of the disappearance of the continuous pulse signal, generating, by a second controller, a second breaking control signal at a second time, wherein the first time is earlier than the second time;
• turning off, by the coil driver, a current in the excitation coil according to the received first breaking control signal, and if the current is not turned off according to the first breaking control signal, further turning off, by the coil driver, the current of the excitation coil according to the second breaking control signal, thereby achieving the breaking of the main contact.

A control circuit for a contactor, wherein the contactor comprises an excitation coil and a main contact coupled to the excitation coil, and the control circuit comprises:

• a pulse converter configured to convert a received turn-on control signal indicating to turn on the contactor into a continuous pulse signal;
• a controller connected to the pulse converter and configured to generate a breaking control signal in response to detection of the disappearance of the continuous pulse signal received from the pulse converter;
• and
• a coil driver connected to the controller and the excitation coil, and configured to turn off a current of the excitation coil according to the received breaking control signal, thereby achieving the breaking of the main contact.