Title :
A Novel Soft-Switching Single-Phase AC–DC–AC Converter Using New ZVS–PWM Strategy
Author :
Wang, Chien-Ming
Author_Institution :
Nat. Ilan Univ., Ilan
Abstract :
This paper proposes a novel soft-switching single- phase ac-dc-ac converter to give high input power factor and low current distortion on the rectifier side and provide clean and stable ac voltage on the inverter side. The proposed converter uses a new zero voltage switching (ZVS) strategy to get ZVS function. Besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage stress. A significant reduction in the conduction losses is achieved, since the circulating current for the soft switching flows only through the auxiliary circuit and a minimum number of switching devices is involved in the circulating current path, and the rectifier in the proposed converter uses a single converter instead of the conventional configuration composed of a four-diode front-end rectifier followed by a boost converter. An average-current-mode control is employed in the rectifier side of proposed converter to detect the transition time and synthesize a suitable low harmonics sinusoidal waveform for the input current. The sinusoidal pulsewidth modulation (SPWM) control strategy is employed in the inverter of proposed converter to achieve good dynamic regulation. A design example of 1000 W soft-switching single-phase ac-dc-ac converter is examined to assess the converter performance.
Keywords :
AC-DC power convertors; DC-AC power convertors; PWM invertors; PWM power convertors; rectifiers; switching convertors; zero voltage switching; SPWM; ZVS-PWM strategy; boost converter; circulating current path; conduction losses; current distortion; four-diode front-end rectifier; inverter; single-phase ac-dc-ac converter; sinusoidal pulsewidth modulation control strategy; soft-switching converter; zero voltage switching strategy; Analog-digital conversion; Frequency; Inverters; Phase distortion; Pulse width modulation converters; Reactive power; Rectifiers; Switching circuits; Switching converters; Zero voltage switching; Sinusoidal pulsewidth modulation (SPWM); zero voltage switching (ZVS);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2007.904208