发明名称 |
PFC-PWM CONTROLLER HAVING A POWER SAVING MEANS |
摘要 |
A PFC-PWM controller with a power saving means is disclosed. A built-in current synthesizer generates a bias current in response to feedback voltages sampled from the PWM circuit and the PFC circuit. The bias current modulates the oscillation frequency to further reduce the switching frequencies of the PWM signal and the PFC signal under light-load and zero-load conditions. Thus, power consumption is greatly reduced. The PFC and the PWM switching signals interleave each other, so that power can be transferred more smoothly from the PFC circuit to the PWM circuit. The saturation of the switching components can be avoided by limiting the maximum on-time of the PWM signal. Further, an external resistor is used to start up the PFC-PWM controller and to provide an AC template signal for PFC control.
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申请公布号 |
US2005007088(A1) |
申请公布日期 |
2005.01.13 |
申请号 |
US20030617516 |
申请日期 |
2003.07.10 |
申请人 |
YANG TA-YUNG;LIN JENN-YU G.;CHEN CHERN-LIN |
发明人 |
YANG TA-YUNG;LIN JENN-YU G.;CHEN CHERN-LIN |
分类号 |
H02M1/00;H02M1/42;(IPC1-7):G05F1/40 |
主分类号 |
H02M1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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