Title :
A soft-switched series-resonant DC/AC inverter without auxiliary switches
Author :
Wang, Chien-Ming
Author_Institution :
Dept. of Electron. Eng., Lunghwa Univ. of Sci. & Technol., Taoyuan, Taiwan
Abstract :
A 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 a series of equal-amplitude quasi-sinusoidal 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 200W. The total harmonic distortions (THDs) for various impedance loads are all within 6%.
Keywords :
DC-AC power convertors; bridge circuits; harmonic distortion; invertors; power conversion harmonics; resonant power convertors; switching circuits; 200 W; 500 W; 90 percent; constant-on time control; equal-amplitude quasi-sinusoidal pulses; frequency modulation; full-bridge series-resonant inversion; impedance load; nonlinear control strategy; output current configuration; output sinusoidal voltage; performance; power efficiency; series resonator; soft-switched series-resonant DC/AC inverter; total harmonic distortions; Circuits; Impedance; Nonlinear dynamical systems; Pulse width modulation inverters; Resonance; Switches; Total harmonic distortion; Uninterruptible power systems; Zero current switching; Zero voltage switching;
Conference_Titel :
Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual
Print_ISBN :
0-7803-7262-X
DOI :
10.1109/PSEC.2002.1022556
