Constant DC offset coronode voltage tracking circuit

Details Constant DC offset coronode voltage tracking circuit Constant DC offset coronode voltage tracking circuit

1998-01-08

1999-05-25

Nguyen, Kiet T.

Radiant energy

Corona irradiation

Charging of objects

250324, 250325, H01T 1424

Patent

active

059071559

ABSTRACT:
An apparatus for maintaining a substantially consistent current to voltage relationship in a corona charging device having an electrode energized by an AC voltage biased by a first DC offset voltage which is modified by a second DC voltage, and a control surface energized by a third DC voltage which is also varied by the second DC voltage. The apparatus includes a system for monitoring a portion of the AC voltage, and for superimposing the first DC voltage on the monitored voltage to generate a control voltage having an AC component and a DC component, and for further superimposing the second DC voltage on the control voltage to vary the control voltage in response to changes in the second DC voltage. The control voltage is then applied to the electrode of the corona charging device. The apparatus provides a constant DC offset coronode voltage tracking circuit that maintains a substantially consistent current to voltage relationship in a scorotron-type corona charging device.

REFERENCES:
patent: 3909614 (1975-09-01), Marshall
patent: 4638397 (1987-01-01), Foley
patent: 5324942 (1994-06-01), Mishra et al.
patent: 5839024 (1998-11-01), May et al.

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