Patent ID: 9742296
Date: 2017-08-22
CPC Classifications: H02M

Claim:
1. A power conversion circuit system comprising: a primary conversion circuit having left and right arms between a primary positive bus and a primary negative bus, each of the left and right arms including two switching transistors connected in series, wherein a primary coil of a transformer is connected between a connection point of the two switching transistors in the left arm and a connection point of the two switching transistors in the right arm; a secondary conversion circuit having left and right arms between a secondary positive bus and a secondary negative bus, each of the left and right arms of the secondary conversion circuit including two switching transistors connected in series, wherein a secondary coil of the transformer is connected between a connection point of the two switching transistors in the left arm of the secondary conversion circuit and a connection point of the two switching transistors in the right arm of the secondary conversion circuit, and a control circuit that controls switching of the switching transistors in the primary conversion circuit and in the secondary conversion circuit, wherein; the control circuit detects a circulating current at timings lagged by π/2+φ/2 from at least either a peak timing or a valley timing in a carrier counter, where φ represents a difference in phase between the primary and secondary conversion circuits, and the control circuit performs feedback control to reduce the detected circulating current to zero.