H. Fujita et H. Akagi, Control and performance of a pulse-density-modulated series-resonant inverter for corona discharge processes, IEEE IND AP, 35(3), 1999, pp. 621-627
This paper presents control and performance of a pulse-density-modulated (P
DM) series-resonant voltage-source inverter developed for corona discharge
processes. The PDM inverter produces either a square-wave ac-voltage state
or a zero-voltage state at its ac terminals to control the average output v
oltage under constant de voltage and operating frequency. This results in a
wide range of power control from 0.5% to 100%, even in the corona discharg
e load with a strong nonlinear characteristic. A 30-kHz 6-kW surface treatm
ent system consisting of a voltage-source PDM inverter, a step-up transform
er, and a corona discharge treater shows the establishment of a stable coro
na discharge in an extremely wide range of power control and, therefore, su
cceeds in performing both strong and weak surface treatment processes for f
ilm.