Patent ID: 7592852

Claim:
A method for controlling a driving circuit comprising steps of: providing a driving circuit and a capacitor electrically connected to the driving circuit, wherein the driving circuit drives a single phase motor and comprises a first switch unit and a second switch unit, the first switch unit comprises a first switch and a second switch, the second switch unit comprises a third switch and a fourth switch, the first and second switch units are alternately turned on, and each switch is coupled to a blocking element in parallel; turning on the first and second switches of the first switch unit simultaneously; turning off the first switch while the second switch is still turned on at a first time point so that the an induction current generated in the driving circuit cannot reach the capacitor for charge or discharge, resulting in a described ripple current; and simultaneously turning off the second switch and turning on the third and fourth switches at a second time point, wherein the first time point and the second time point are different, and the first time point is before the second time point.