D.C. voltage supply circuit

摘要

A d.c. supply circuit containing a series-circuit composed of a switch and an inductor. A regulator circuit is provided to alternatingly drive the switch into conductive and nonconductive states. The control is performed by the inductor and responsive to current (iL). The series-circuit also includes an auxiliary switch, to which is connected, in parallel, a series-circuit formed by a diode and a capacitor. In short periods, in which the switch is conductive while the auxiliary switch is nonconductive, the capacitor is charged in order to generate the supply voltage for the regulator circuit.