High-performance switching regulators with power factor correction (PFC): Analysis, design, control and practical implementation.

摘要

Motivated by the need for improving power quality of line-fed electronics appliances, this thesis is aimed primarily at investigating the theoretical foundation and practical considerations for the implementation of switching regulators with power factor correction (PFC). Starting with a discussion of the existing methods of power factor correction and the circuit requirements for achieving both high power quality and fast output regulation in switching regulators, the basic PFC switching regulator is modeled by a three-port network from which a family of sixteen configurations is derived based on the concept of power flow graphs. Due to its potential in the reduction of component cost, the single-stage PFC switching regulator using the cascaded-boost-buck topology is studied in detail. For this type of PFC switching regulators, a novel frequency-modulation scheme is proposed for the elimination of line-current harmonics. A practical controller is developed accordingly using current-mode translinear circuits. Driven by the controller, the single-stage PFC switching regulator can achieve harmonic-free line current with low voltage stress and fast output regulation. Due to its distortion-free performance when operating in continuous input current mode, the PFC switching regulator using the Sheppard-Taylor topology is also studied in detail and is compared with its counterparts using the cascaded-boost-buck topology. Due to the possibility of using an inductor as the energy storage element in PFC applications, the duality principle is applied to the cascade-boost-buck topology for synthesis of new PFC switching regulators operating in discontinuous capacitor voltage mode. This thesis represents original contributions by the author to the subject of switching regulators with PFC, and provides important analytical and practical information for the realization of high performance switching regulators with good power quality.