Patent ID: 6377481
Filing Date: 2002-04-23
Classification: H02M,Y02B

Abstract:
A power supply circuit comprising:a main inductor having a first end, a second end and a tap between the first and second ends; a main diode coupled to the tap of the main inductor; and a diode recovery current suppression circuit including an auxiliary inductor and an auxiliary diode coupled in series, the diode recovery current suppression circuit being coupled to the second end of the main inductor, wherein charging current from the main inductor flows through the main diode and the auxiliary diode, the current flowing through the main diode initially being substantially equal to the charging current flowing from the main inductor and thereafter decreasing to substantially zero, and the current flowing through the auxiliary diode being substantially zero when the current flowing through the main diode is substantially equal to the charging current and thereafter increasing until it becomes substantially equal to the charging current flowing from the main inductor.