发明申请
- 专利标题: POWER FACTOR CORRECTION CIRCUIT AND POWER SUPPLY APPARATUS THEREOF
- 专利标题(中): 功率因数校正电路及其电源设备
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申请号: US12110892申请日: 2008-04-28
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公开(公告)号: US20090230937A1公开(公告)日: 2009-09-17
- 发明人: Chun-Hua Xia , Shih-Hao Liu
- 申请人: Chun-Hua Xia , Shih-Hao Liu
- 申请人地址: TW Taipei City
- 专利权人: INVENTEC CORPORATION
- 当前专利权人: INVENTEC CORPORATION
- 当前专利权人地址: TW Taipei City
- 优先权: TW97108698 20080312
- 主分类号: G05F1/46
- IPC分类号: G05F1/46
摘要:
A power factor correction circuit including a boost converter, a first capacitor, a first resistor, and a boost control unit is provided. The boost control unit includes a signal generator and a frequency controller. The boost converter transforms a rectified voltage to a correction voltage according to a pulse width modulation (PWM) signal. The first capacitor and the first resistor are coupled between an input terminal and a ground terminal of the boost converter. The boost control unit is adapted to generate the PWM signal, and adjust a duty cycle and a frequency of the PWM signal according to a current flowing through the first resistance, the rectified voltage and the correction voltage. Wherein, the signal generator is adapted to generate a ramp signal and adjust a slope of the ramp signal according to a charging current. The frequency controller adjusts the charging current according to the rectified voltage.