基于Boost变换器的非线性载波控制PFC电路

A Novel nonlinear-carrier Control for Power Factor Correction

本文阐述了一种非线性载波(nonlinear-carrier,NLC)控制的 PFC 电路,该电路与传统单级功率因数矫正电路相比不再需要输入电压、电流采样以及复杂的模拟乘法器和电流误差放大器电路。非线性载波控制理论基于对变换器元器件(开关管、二极管或电感)的电流检测,并与非线性载波做比较获得开关管 PWM 波形来实施控制。

This paper introduced a kind of nonlinear-carrier（NLC）controller for high power factor Boost converters. Using the NLC controller, input line voltage and current sensing, error amplifier in the current shaping loop, and analog multiplier/divider are eliminated. In the NLC controller, the switch duty ratio is determined by comparing an integrated current waveform which based on the integration of a current signal（switch, diode,or inductor current）with a periodic Nonlinear-carrier waveform.