Method, controller and system for regulating a current of a coil

Abstract

Embodiments of the present disclosure provide method, controller and system for regulating a current of a coil. The method comprises: obtaining a first sample value of the current of the coil at a first moment, the first sample value being associated with a duty cycle of a PWM signal applied to a control end of a switch and the switch being coupled in series with the coil; obtaining a second sample value of the current of the coil at a second moment; determining a difference value between the first and the second sample values; and updating the duty cycle of the PWM signal based on the difference value to regulate the current of the coil. According to embodiments of the present disclosure, the inrush current of the coil generated at the moment of closing the contactor can be limited to a target current value, so as to increase the service life of the contactor.

Dependencies are inferred from the claim text.