Showing papers on "PWM rectifier published in 1988"
TL;DR: In this article, an experimental single-phase controlled-current PWM rectifier that operates at unity power factor with near sinusoidal current waveform and has power reversal capability is presented.
Abstract: The analysis and test results are given for an experimental single-phase controlled-current PWM (pulse-width-modulated) rectifier that operates at unity power factor with near sinusoidal current waveform and that has power reversal capability. The twice-line-frequency AC power is identified as a source of voltage harmonics in the DC link. The harmonics enter into the voltage regulation feedback loop to distort the AC current waveform. These undesirable harmonics can be removed by a low-pass filter. It is noted that the overall design must address the possibility of instability due to the low-pass filter in the feedback path. >
164 citations
TL;DR: Two identical three-phase, bipolar transistor, controlled-current, pulsewidth modulation (PWM) power modulators are integrated so that one functions as a rectifier and the other as an inverter in an AC drive system.
Abstract: Two identical three-phase, bipolar transistor, controlled-current, pulsewidth modulation (PWM) power modulators are integrated so that one functions as a rectifier and the other as an inverter in an AC drive system. The rectifier input currents maintain near-60-Hz sinusoidal waveforms with unity power factor. A leading power factor is also possible. The modulators do not depend on the availability of bidirectional switch elements. Performance as a polyphase induction motor drive under motoring and regenerative braking is reported. The study includes digital simulation of operation as a synchronous motor drive. >
144 citations
01 Jan 1988
TL;DR: In this article, a novel circuit topology of isolated DC-DC power converter, which includes stable and efficient zero voltage soft switching (ZVS) full bridge inverter in the high frequency planer transformer primary-side and zero current soft switching rectifier in its secondary side, is presented.
Abstract: This paper presents a novel circuit topology of isolated DC-DC power converter, which includes stable and efficient zero voltage soft switching (ZVS) full bridge inverter in the high frequency planer transformer primary-side and zero current soft switching rectifier in its secondary side. This power converter incorporates zero current soft switching (ZCS) phase-shifted PWM controlled two active power switches in series with either right or left leg of full-bridge rectifier in the transformer secondary-side. The proposed soft switching DC-DC power converter can achieve a wide soft-switching commutation under wide load variations from an extremely light load to a heavy load at a condition of constant frequency phase-shifted PWM voltage regulation and high conversion efficiency due to reduced circulating current and idling in the primary side of the transformer. The operating principle and the performance evaluations are discussed based on simulation analysis and experimental results obtained on a 2 kW rating and 40 kHz switching frequency breadboard power converter setup. The practical effectiveness of this soft-switching DC-DC power converter with a high frequency link is proven on the basis of simulation and experimental results.
4 citations