| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === A one-cycle control based trailing-edge boost type power factor correction IC with instant-switch-current control is proposed in this thesis. It can be utilized to control the front stage of power converter. This control IC is easy to use because only two feedback signals are needed. One is input current and another is output voltage. Multiplier is excluded in this chip. In conventional PFC control chip, the input voltage and load demand are related by using a multiplier. The performance of power factor correction is highly dependent on the precision of multiplier. By using the integrator with reset proposed in one cycle control, the duty ratio can be precisely controlled to lower the total harmonic distortion. Moreover, a level shift circuit is adopted to make this chip work with unipolar supply voltage. For the purpose of better performance, the functions such as leading edge blanking (LEB) and over voltage protection (OVP) are also integrated into the proposed chip. This chip is fabricated with 0.35μm 2P4M 3.3V/5V Mixed Signal CMOS Process.
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