期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 18, 期 3, 页码 764-774出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2003.810859
关键词
FB-SRI; frequency modulation; nonlinear control; soft-switch
A nonlinear control for soft-switched series-resonant dc/ac inverter without auxiliary switches is presented. The inverter is configured by a full-bridge series-resonant inversion (FB-SRI) without cycloconversion and auxiliary switches. The inverter is a series resonator with four main switches to configure adaptively the output current suitable for impedance load. The output sinusoidal voltage is synthesized by 6 series of equal-amplitude quasisinusoidal Pulses (QSPs) and the corresponding current is formed by unequal QSPs and adaptively phase-shifts to the impedance load. The nonlinear control strategy is designed against the input dc perturbation and achieves. good dynamic regulation. The presented FB-SRI is operated by frequency modulation with a constant-on time control. Waveform syntheses for the output sinusoidal,voltage and its current are clearly derived. A typical design example of a 500 W FB-SRI inverter is examined to assess the system performance. The power efficiency is over 90% when the inverter output is above 200 W. The total harmonic distortions (THDs) for various impedance loads are all within 6%.
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