A phase shift full bridge (PSFB) converter includes a switch portion including first to fourth switches connected in a form of a full bridge, a transformer configured to convert the output of the switch portion, a rectifying portion including at least one of a switch and a diode and configured to rectify the output of the transformer, a resonance inductor having an end connected to another end of a primary portion of the transformer and another end connected to a node between the third switch and the fourth switch, a first clamp diode having an end connected to an end of the first switch and another end connected to the other end of the primary portion of the transformer, and a second clamp diode having an end connected to the other end of the primary portion of the transformer and another end connected to another end of the second switch.