峰值电流模式控制BoostPFC变换器斜波补偿设计

Slope compensation design in peak current mode controlled PFC boost converter

峰值电流模式控制Boost PFC变换器中存在着丰富的非线性行为,为了控制以削弱不稳定现象的范围,工程上通常采用斜波补偿的方法,但完全靠设计经验。以非线性系统理论的分叉控制观点给出了系统稳定性的临界参数条件及判据,推导了斜波补偿法的参数选择公式,为设计电路时的参数选择提供了理论依据,对实际产品开发具有一定的指导意义。

There are many nonlinear phenomenon in the PFC Boost converter under a conventional peak current-mode control .To avoid the unpredictable or sometimes undesirable consequences in systems, a compensating ramp was adopted in the engineering while it did by experience. The critical conditions and basis of the stability was given, and the formula of choosing the parameter was deduced, which could therefore provide theory evidence and guidance for the practical design.