Patent ID: 6351073
Filing Date: 2002-02-26
Classification: H02M

Abstract:
A self-supplied DC/DC switching power supply circuit, comprising:an input terminal having an input voltage applied thereto by an external power source; an output terminal from which a power supply output voltage is generated by said switching power supply circuit; a rectifying filter including each of a diode and a capacitor for rectification of said input voltage; a control circuit in electrical communication with a switching element for driving said switching element between an open gate position and a closed gate position for initiating operation of said switching power supply circuit; an inductor in electrical communication with each of said switching element and one or both of said diode and said capacitor; and an igniter circuit in electrical communication with said control circuit for delivering a minimum activation voltage to said control circuit for a predetermined temporal duration sufficient for activation of said control circuit after which said temporal duration said power supply output voltage supplies said control circuit with a stable DC voltage independent of said input voltage.