Switching regulator circuit capable of eliminating power supply recharging operation by reverse coil current

Abstract

A synchronous rectifying type switching regular circuit operable in a high efficiency is obtained, while a reverse current flowing through a coil is not used to charge a power supply. In a synchronous rectifying type switching regulator circuit for alternately turning ON/OFF a first switch element for controlling a current of a coil employed in the switching regulator and a second switch element connected parallel to a commutation diode, a capacitor is added to an input of the switching regulator circuit; a third switch element is interposed between a power supply such as a battery and the capacitor; and when the first switch element is turned ON, the third switch element is turned ON, whereas when the first switch element is turned OFF, the third switch element is turned OFF.

Dependencies are inferred from the claim text.