Abstract
Pulse width modulation rectifiers are extensively used in battery charger, regulated dc voltage source, UPS systems, static frequency changer and ac line conditioner, where the main requirements are unidirectional power flow, regulated output dc voltage and near unity input power factor. In case of single switch boost rectifier, additional requirement of dc bus voltage balancing is essential. The conventional control techniques involve complex mathematical operations, which increase the cost and complexity of the controller. Simple control schemes based on constant-switching-frequency resistance emulation control, which do not require any of the above operations, are developed here for PWM boost rectifier. All the necessary control operations are performed without using multiplication, division and square-root operation. The power circuit of the proposed converter can be configured either for DCM or for CCM by simple on-off control of an auxiliary switch. Similarly, the proposed control circuit can also be configured either for CCM or for DCM simply by choosing the appropriate carriers.
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