Patent ID: 7332897

Claim:
A DC-DC converter including a main inductor connected to an input voltage, a main switching element connected in series to the main inductor, a main diode connected to the main inductor and a load, and a main capacitor connected to the main diode and the load, the DC-DC converter changing the input voltage to output a changed input voltage as an output voltage, the DC-DC converter comprising: an oscillator connected between the main inductor and the main diode; an auxiliary switching element connected between first and second inductors of the oscillator, the auxiliary switching element changing an operation state of the auxiliary switching element based on an externally applied control signal to control the oscillator; and a diode unit connected to the oscillator and the auxiliary switching element and controlling current flow, based on operations of the oscillator and the auxiliary switching element, to change the output voltage, wherein the main switching element and the main diode are to be zero voltage switching or zero current switching in accordance with the operations of the oscillator and the auxiliary switching element.