Abstract
Influence of applied voltage and frequency on electrostatic elimination by using AC corona
Ionizer is investigated. The corona discharge is generated using a needle to ring electrodes with
high voltage AC. The compressed air is supplied to an air nozzle to generate the air flows from the
electrodes to the ion trapping metal plate. The discharge current increases and the interval of trichel
pulse decreases with increasing the frequency of the applied voltage. The electrostatic elimination
time decreases with increasing the air velocity. When the air pressure is lower than 13.3 kPa, the
electrostatic elimination time increases with increasing the frequency of applied voltage. The bias
voltage required to keep ion balance 0 V decrease with increasing the frequency when the frequency
is lower than 250 Hz. On the other hands, that increases with increasing the frequency when the
frequency is higher than 250 Hz. The air ions generated by the corona discharge are accumulated
in the space between the needle and the ring electrodes. The amount of space charge increases with
increasing frequency and decreasing air velocity. Therefore, the current into the ion trapping metal
plate decreases with increasing the frequency when the air pressure is not sufficiently high.
