Low Harmonic Rectifier Modeling and Control

The techniques developed in earlier chapters for modeling and analysis of dc—dc converters are extended in this chapter to treat the analysis, modeling, and control of low-harmonic rectifiers. The CCM models of Chapter 3 are used in Section 18.1 to compute the average losses and efficiency of CCM PWM converters operating as rectifiers. The results yield insight that is useful in power stage design. Several converter control schemes are now in use. Peak current programming, average current control, and input voltage feedforward are all implemented in the available control ICs. Nonlinear carrier control is a relatively new scheme having a simple implementation. These schemes are discussed in Section 18.2. Modeling of the rectifier control system is covered in Section 18.3.

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