An embodiment of the present invention relates to an interleaved phase-shift full-bridge DC-DC converter circuit for applying power outputted from DC power source having a constant power voltage to load, which comprises: a transformer unit including a first transformer and a second transformer which respectively have an input coil and an output coil; a load circuit receiving the power from the DC power source through the transformer unit and delivering the power to the load to make output voltage applied to both ends of the load remain constant; and a power source circuit including a first to a sixth switch and transmitting the power from the DC power source through the transformer unit to the load circuit. One end of the input coil of the first transformer is connected to one end of the input coil of the second transformer, and additionally connected to a high-voltage terminal of the DC power source through the third switch and to a low-voltage terminal of the DC power source through the fourth switch; the other end of the input coil of the first transformer is connected to a high-voltage terminal of the DC power source through the first switch and to a low-voltage terminal of the DC power source through the second switch; and the other end of the input coil of the second transformer can be connected to a high-voltage terminal of the DC power source through the fifth switch and to a low-voltage terminal of the DC power source through the sixth switch.
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