Patent ID: 9614432
Date: 2017-04-04
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A PFC signal generation circuit that generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch, the PFC signal generation circuit comprising: a first control signal output circuit that outputs a first PFC signal to turn on the first switch at a zero current detection timing of the first inductor; a timing adjustment circuit that generates a control signal to turn on the second switch after waiting until a target timing in a first cycle, when a zero current detection timing of the second inductor is earlier than the target timing in the first cycle, and to turn on the second switch at a target timing in a second cycle, which is subsequent to the first cycle, when the zero current detection timing of the second inductor is later than an allowable period in the first cycle from the target timing in the first cycle; and a second control signal output circuit that generates a second PFC signal to turn on the second switch, according to the control signal, wherein when the zero current detection timing of the second inductor is within the allowable period in the first cycle, the timing adjustment circuit generates, at the zero current detection timing of the second inductor, the control signal to turn on the second switch, wherein the target timing in the first cycle occur at a first redetermined time from the beginning of the first cycle, the target timing in the second cycle occur at a second predetermined time from the beginning of the second cycle, and the allowable period in the first cycle occur at a third predetermined time from the target timing in the first cycle.