Patent ID: 7855902

Claim:
A DC-DC converter comprising: an input terminal receiving a DC input voltage; an output terminal outputting a DC output voltage; an output switching device connected between the input and output terminals; a voltage detection circuit connected between both ends of the output switching device and detecting a voltage corresponding to an electric potential difference between both ends of the output switching device; and a control circuit turning on the voltage detection circuit at a predetermined time after the output switching device is turned on, wherein the voltage detection circuit comprises a detection resistor through which a current corresponding to the electric potential difference flows and a detection switching device connected to the detection resistor, the voltage detection circuit being configured to detect the voltage corresponding to the electric potential difference based on the current, and the detection switching device being configured to be turned on so as to allow the current to flow through the detection resistor, and wherein the control circuit controls the detection switching device so that the detection switching device is turned on when the output switching device is operating in a non-saturating manner.