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METHOD AND APPARATUS FOR AUTOMATIC AVERAGE CURRENT MODE CONTROLLED POWER FACTOR CORRECTION WITHOUT INPUT VOLTAGE SENSING
METHOD AND APPARATUS FOR AUTOMATIC AVERAGE CURRENT MODE CONTROLLED POWER FACTOR CORRECTION WITHOUT INPUT VOLTAGE SENSING
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机译:无输入电压感应的自动平均电流模式控制功率因数校正的方法和装置
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摘要
A method for preparing power factor control integrated circuits which generate linear pulse width modulation (PWM) waveforms is presented. The method of pulse width modulation waveform generation involves providing a capacitor; fast charging the capacitor; and controlling a discharge rate of the capacitor to ensure a constant switching period and a linear PWM waveform. The method is applicable for any single-phase ac/dc converter topology that performs power factor correction. Unlike conventional techniques which utilize three feedback loops, the method of the present invention reduces the total number of feedback loops to two, eliminates input voltage sensing and achieves the same objective. This method results in significant integrated circuit simplification, such as elimination of multiplier, squarer and divider circuits in the control integrated circuit and reduces the cost of the integrated circuit.
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