Time for opening and closing vacuum circuit breaker（VCB） in the presence of permanent magnet actuator（PMA） can be kept stable by controlling the coil current. In order to improve control accuracy of the current

and make the switching more reliable

we proposed a hybrid pulse-width modulation（PWM） control method

analyzed reasons why the accuracy of the current output by controller was affected

and described the principle for hybrid pulse-width modulation in detail. Moreover

Factors that would impact the duty cycles were analyzed in detail

and both the accurate calculating and the approximate calculating methods for the reference duty cycle’s value of hybrid PWM were given. Experiments have verified that opening and closing VCB will be more reliable when using hybrid PWM control method

which can effectively reduce the ripple of the current and improve the quality of the output current. By using the control method

the deviation of the current can be reduced by more than 86%.