发明名称 |
Control circuit for multi-phase, multi-channels PFC converter with variable switching frequency |
摘要 |
A switching control circuit for multi-phases PFC converters is provided. It includes a PFC-control circuit coupled to receive a first-inductor signal and a feedback signal for generating a first-switching signal. The first-switching signal is utilized to switch the first inductor for power factor correction. A phase-detection circuit detects the first-switching signal and a second-inductor signal for generating a start signal and a phase-lock signal. The start signal is developed to enable a second-switching signal. The second-switching signal is coupled to switch a second inductor. An on-time-adjust circuit is coupled to adjust the on time of the second-switching signal in accordance with the phase-lock signal. The phase-lock signal is correlated to the period between the end of the second-inductor signal and the start of the second-switching signal.
|
申请公布号 |
US7626372(B2) |
申请公布日期 |
2009.12.01 |
申请号 |
US20070867042 |
申请日期 |
2007.10.04 |
申请人 |
SYSTEM GENERAL CORPORATION |
发明人 |
YANG TA-YUNG |
分类号 |
G05F1/70;G05F1/63 |
主分类号 |
G05F1/70 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|