Isolated DC-DC converter

An isolated DC-DC converter of a phase shift type, comprising:

• a transformer including a primary-side coil and a secondary-side coil;
• a full-bridge switching circuit including a first switch element, a second switch element, a third switch element, and a fourth switch element;
• a protective circuit including a first diode and a second diode;
• a control unit configured to control an operation of the switching circuit;
• an inductor;
• and
• an output circuit connected to the secondary-side coil,
• wherein the first switch element and the second switch element are connected in series between a first conductive path and a second conductive path,
• the third switch element and the fourth switch element are connected in series between the first conductive path and the second conductive path,
• one end of the inductor is electrically connected to a first connection point between the first switch element and the second switch element,
• another end of the inductor is electrically connected to one end of the primary-side coil, an anode of the first diode, and a cathode of the second diode,
• another end of the primary-side coil is electrically connected to a second connection point between the third switch element and the fourth switch element,
• a cathode of the first diode is electrically connected to the first conductive path, and
• an anode of the second diode is electrically connected to the second conductive path,
• the isolated DC-DC converter further comprising:
• a voltage detection unit that detects a voltage value between the first conductive path and the second conductive path;
• and
• a current detection unit that detects a current value of the inductor,
• wherein the control unit determines at least one of a first dead time in which both the first switch element and the second switch element are off and a second dead time in which both the third switch element and the fourth switch element are off on the basis of the voltage value detected by the voltage detection unit and the current value detected by the current detection unit, using a method that increases the dead times as the voltage value increases and reduces the dead times as the current value increases.