Boost Rectifier
International Conference On Industrial Engineering and Manufacturing ICIEM’10, May, 9-10, 2010, Batna, Algeria
SINGLE-PHASE BOOST POWER FACTOR CORRECTOR
L. RAHMANI
Laboratoire d’Automatique de Sétif (LAS), Université de Sétif, Faculté des Sciences de L’ingénieur, Département d’électrotechnique, Route de Bejaia, Sétif, Algérie, Lazhar_rah@yahoo.fr
Abstract--This paper presents the analysis, a modeling approach to obtain a small-signal model, design and the digital implementation of a linear control technique for single-phase boost power factor correctors (PFC). Such converters present nonlinear characteristics and an approximation of them are used to drive the models. The most important result obtained is that the small-signal output is not equal to the load impedance. The proposed circuit significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the voltage loop by adding low-pass filter, so that a low distortion of the input current is easily achieved. This controller has been verified via simulation in Simulink using a continuous time plant model and a discrete time controller. Index Terms—power, factor, correction, boost, rectifier.
I. INTRODUCTION. Single-phase power factor correction (PFC) circuits provide rectification of the line voltage to a regulated dc voltage while shaping the input current to be a sinusoid and in phase with the line voltage [1]. Often, the PFC acts as a preregulator to a dc–dc converter that may be used to provide additional regulation and ohmic isolation [2], [3]. Due to adoption of IEC 1000-3-2 [4] as the EN61000-3-2 norm in Europe and the formulation of the IEEE 519 [5] in the USA, these circuits are increasingly being used in the front-end of electronic equipment. Among the several possible topologies [2], the boost PFC shown in Fig. 1 is most commonly used. The control objectives are to track the inductor current to a rectified Sinusoid (so that the line
SINGLE-PHASE BOOST POWER FACTOR CORRECTOR
L. RAHMANI
Laboratoire d’Automatique de Sétif (LAS), Université de Sétif, Faculté des Sciences de L’ingénieur, Département d’électrotechnique, Route de Bejaia, Sétif, Algérie, Lazhar_rah@yahoo.fr
Abstract--This paper presents the analysis, a modeling approach to obtain a small-signal model, design and the digital implementation of a linear control technique for single-phase boost power factor correctors (PFC). Such converters present nonlinear characteristics and an approximation of them are used to drive the models. The most important result obtained is that the small-signal output is not equal to the load impedance. The proposed circuit significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the voltage loop by adding low-pass filter, so that a low distortion of the input current is easily achieved. This controller has been verified via simulation in Simulink using a continuous time plant model and a discrete time controller. Index Terms—power, factor, correction, boost, rectifier.
I. INTRODUCTION. Single-phase power factor correction (PFC) circuits provide rectification of the line voltage to a regulated dc voltage while shaping the input current to be a sinusoid and in phase with the line voltage [1]. Often, the PFC acts as a preregulator to a dc–dc converter that may be used to provide additional regulation and ohmic isolation [2], [3]. Due to adoption of IEC 1000-3-2 [4] as the EN61000-3-2 norm in Europe and the formulation of the IEEE 519 [5] in the USA, these circuits are increasingly being used in the front-end of electronic equipment. Among the several possible topologies [2], the boost PFC shown in Fig. 1 is most commonly used. The control objectives are to track the inductor current to a rectified Sinusoid (so that the line