In this paper, a step-upidown single-phase ac-to-dc converter without current sensor is proposed to achieve high performance and simple control logic. The converter adopts a front-end diode rectifier so that only one active switch is required.The familiar state-space averaging technique for discontinuous mode dc to dc converters is extended to model the proposed ac to dc converter. Unlike the existing model, which is valid only for very low frequency range, namely below line frequency, the proposed model is applicable up to half switching frequency. Design of the controller is detailed for reference. Finally, some selected experimental results are presented to verify the proposed theory.
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