H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/83
H02M 7/12 (2006.01)
Patent
CA 1098169
ABSTRACT OF THE DISCLOSURE ELECTROSTATIC COATING SYSTEM A system for electrostatic deposition of a coating on an article from a charging device includes a direct current high voltage supply having first and second terminals across which the high voltage is impressed. The article to be coated is held at a potential substantially equal to the potential on one of the high voltage terminals. The article is suspended for relatively free movement toward and away from the device. The system includes a high-speed switch coupled between the high voltage terminals and a control circuit for controlling the switch. A sensing resistor in the high voltage output cir- cuit monitors the current between the high voltage terminals. The control circuit includes a slope-detecting or fixed differ- ence circuit responsive to the sensed current to detect too- rapid changes therein, such changes being indicative of close proximity of the article to the charging device and the possi- bility of high voltage arcing therebetween. The fixed differ- ence circuit compares a sampled signal, related to the sensed current by a fixed difference, with a signal related to the instantaneous value of the sensed current to predict a condi- tion conducive to high voltage arcing. The control circuit additionally includes ah automatic ranging circuit for com- paring a sampled signal related to the actual current through the sensing resistor with a signal related to a predetermined multiple of the instantaneous current through the sensing resistor.
359376
Gowling Lafleur Henderson Llp
Ransburg Corporation
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