发明名称 |
POWER FACTOR CORRECTION CIRCUIT AND METHOD OF VARYING SWITCHING FREQUENCY |
摘要 |
<p>A power factor correction (PFC) circuit (10) includes a pulse width modulator (31) operating in response to a clock signal (CLK) for switching a coil current (ICOIL) over a charging period (TCHG) to correct a power factor at a node (32). The coil current discharges over a discharging period (TDSCHG) to develop an output voltage (VOUT) at an output (30). An oscillator (35) generates the clock signal to have a clock period (TCLK) longer than the sum of the charging and discharging periods, thereby operating in a discontinuous mode, and has an input (39) for sensing the input signal to modify the clock period.</p> |
申请公布号 |
WO2004107546(A1) |
申请公布日期 |
2004.12.09 |
申请号 |
WO2003US13859 |
申请日期 |
2003.05.06 |
申请人 |
SEMICONDUCTOR COMPONENTS INDUSTRIES L.L.C.;TURCHI, JOEL |
发明人 |
TURCHI, JOEL |
分类号 |
H02M1/00;H02M1/42;(IPC1-7):H02M1/00 |
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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