Patent ID: 6424549
Filing Date: 2002-07-23
Classification: H02J,H02M,Y02B,Y02P,Y04S

Abstract:
A voltage converter comprising:a rectifier stage connected to the mains and providing a rectified voltage; a power factor correction pre-regulating circuit for receiving the rectified voltage and providing a DC voltage having a predetermined nominal value; a DC-DC converter for receiving the DC voltage and providing a regulated DC voltage to a load; a clock for providing a clock signal to said DC-DC converter having a frequency selectable between at least a low value and a high value based upon a selection signal; a stand-by circuit for providing the selection signal to said clock based upon a current delivered to the load; and a control circuit comprising a comparator for providing a disabling signal to said power factor correction pre-regulating circuit based upon the selection signal assuming the low value.