Patent ID: 9184662
Filing Date: 2015-11-10
Classification: H02M,Y02B

Abstract:
1. A variable output type electric power supply apparatus comprising a multi-resonant type half bridge converter, wherein the multi-resonant type half bridge converter comprises: a transformer; a series circuit of two of first switch elements connected between terminals of a direct current electric power supply; an LC resonant circuit connected between both terminals of one of the first switch elements and a primary winding of the transformer; bidirectional second switch elements connected to secondary windings of the transformer and having rectification function and phase control function; and a control circuit which inputs gate driving signals each having phase differences to the first switch elements and the second switch elements, and outputs from the secondary windings of the transformer are variable, the second switch elements each has two channels of a forward direction and a reverse direction with respect to an electric current flowing in the secondary winding of the transformer and a first gate and a second gate corresponding thereto; and the control circuit realizes the phase control function by inputting first gate driving signals, having a predetermined phase difference from driving signals inputted into the first switch element, into the channel of the forward direction, and realizes synchronous rectification by inputting second gate driving signals into the channel of the reverse direction.