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This paper implements a wide range of power control with pulse-density-modulation (PDM) in a voltage source series-resonant inverter which realizes a corona discharge for the surface treatment of films. The use of the PDM inverter enables the employment of a three-phase diode bridge rectifier as an electric utility interface. The PDM inverter produces either a square-wave AC voltage state or a zero voltage state at its AC terminals to control the discharge power of a corona surface treater. Moreover, it can achieve zero-current-switching (ZCS) and zero-voltage-switching (ZVS) under all the operating conditions, thus leading to a significant reduction of switching losses and electromagnetic noise. A 80 kHz, 6 kW surface treatment system consisting of a voltage-source PDM inverter, a step-up transformer and a corona discharge treater shows the establishment of a stable corona discharge in an extremely wide range of power control from 0.5 to 100 %, and therefore succeeds in performing both strong and weak surface treatment processes for films
DC-AC power convertors
Digital Object Identifier: 10.1109/PESC.1997.616849
Published with permission from the copyright holder. This is the institute's copy, as published in Information Visualization, 22-27 June 1997, Volume 2, Pages 1000-1006.
Copyright © 1997 IEEE. All rights reserved.