Patent ID: 7706153
Filing Date: 2010-04-27
Classification: H02M

Abstract:
1. A DC-DC converter comprising: a switching circuit having first and second switching elements connected in series between a reference potential point and an input voltage point to which a direct current voltage from a direct current voltage source is to be supplied, the switching circuit periodically repeating a period in which one of the switching elements is conductive while the other one of the switching elements is non-conductive; a period in which both of the switching elements are turned OFF; and a period in which the other switching element is conductive while the one of the switching elements is non-conductive; a serial circuit composed of a first capacitor, a first inductance element, and a second inductance element, the first and second inductance elements having primary windings and secondary windings, the first capacitor and the primary windings of the first and second inductance elements being connected in series, and a connection being made between an output point of the switching circuit and the reference potential point or between an output point of the switching circuit and the input voltage point, and the first capacitor being across a path through which energy is transmitted from the primary windings to the secondary windings of the first and second inductance elements to prevent saturation of the first and second inductance elements; and output circuits including rectifier elements, each of which rectifies a voltage induced by the secondary windings of the first and second inductance elements, the output circuits obtaining a direct current output voltage.