Patent ID: 7005834
Filing Date: 2006-02-28
Classification: H02M,Y02B

Abstract:
1. A power supply of a synchronous rectification type including a DC input power supply, a first insulated gate type power semiconductor element having one main terminal connected to a high potential side of the DC input power supply and a second insulated gate type power semiconductor element having one main terminal connected to the other main terminal of the first insulated gate type power semiconductor element and the other main terminal connected to a low potential side of the DC input power supply, a coil having one terminal connected to the other main terminal of the first insulated gate type power semiconductor element, an output condenser having one terminal connected to the other terminal of the coil and the other terminal connected to the other main terminal of the second insulated gate type power semiconductor element, a load having one terminal connected to the other terminal of the coil and the other terminal connected to the other main terminal of the second insulated gate type power semiconductor element, and a control circuit for driving gates of the first and second insulated gate type power semiconductor elements, wherein an absolute value of a threshold voltage of said second insulated gate type power semiconductor element is higher than that of said first insulated gate type power semiconductor element.