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Novel single-phase AC-to-DC convertor using three-phase modified series–parallel resonant convertor

Novel single-phase AC-to-DC convertor using three-phase modified series–parallel resonant convertor

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The paper deals with a single-phase AC-to-DC convertor using a three-phase modified series–parallel resonant convertor. A systematic procedure is presented for the design of three-phase resonant-convertor components. Based on the analysis and design curves, a resonant convertor is designed for 2.5 kW rating. The minimum switching frequency of the convertor is 290 kHz at full-load condition. The simulation and experimental results are presented for variable-load conditions. The variable frequency and duty-ratio control scheme are implemented using a digital signal processor for output-voltage regulation. The use of a three-phase high-frequency invertor reduces the filtering requirements, peak component stresses on the resonant components and peak invertor output current. The proposed convertor maintains excellent input-line power factor without any active control of AC-input line current. Apart from this, it requires narrow variation in switching frequency for its output-voltage regulation.

Inspec keywords: digital signal processing chips; frequency control; AC-DC power convertors; resonant power convertors; resonant invertors; switching convertors; voltage control

Other keywords: variable-load condition; high-frequency invertor; switching frequency; 290 kHz; stresses; variable frequency; series-parallel resonant convertor; digital signal processor; filter components; voltage regulation; single-phase AC-DC convertor; power factor; design curves; 2.5 kW; duty-ratio control

Subjects: Power convertors and power supplies to apparatus; Control of electric power systems; Microprocessors and microcomputers; Frequency control; Voltage control; Digital signal processing chips

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