Patent ID: 7602165

Claim:
A phase control device for use with a voltage-boosting DC/DC converter including a low-voltage-side port and a high-voltage-side port, the DC/DC converter further including a transformer of a magnetic-field cancellation type having a primary winding and secondary winding interconnected in an oppositely-wound configuration with a common terminal of the primary winding and secondary winding being connected to a positive-pole terminal of the low-voltage-side port, first switching means for controlling an energizing current of the primary winding which flows to a common reference terminal, and second switching means for controlling an energizing current of the secondary winding which flows to the common reference terminal, the phase control device comprising: current detecting means for detecting a current flowing through at least one of the primary and secondary windings; determining means for, on the basis of a current signal detected by the current detecting means, determining an amount of current ripple occurring when the first switching means or the second switching means switches to an ON state; and phase regulating means for, on the basis of the amount of current ripple determined by the determining means, regulating a phase related to an ON time of each of the first and second switching means such that the amount of current ripple is reduced to zero.