Patent ID: 7952338

Claim:
A boost DC/DC converter comprising: a direct-current power source, of which a negative terminal is connected to ground; an inductor connected to a positive terminal of the direct-current power source; a first switching element connected between the inductor and the ground and having a first control node for controlling an on-resistance thereof; a second switching element connected in series to the inductor and having a second control node for controlling an on-resistance thereof; a smoothing capacitor connected between the second switching element and the ground; a switching circuit configured to select a voltage of the direct-current power source during a start-up phase, and to select an output voltage of the smoothing capacitor after the start-up phase; and a control unit configured to cause the switching circuit to apply the voltage selected by the switching circuit to the first control node of the first switching element and the second control node of the second switching element at a predetermined cycle.