Arc preventing electrostatic power supply
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United States of America Patent
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-
Aug 11, 1992
Grant Date -
N/A
app pub date -
Jan 23, 1991
filing date -
Jan 23, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arc preventing electrostatic power supply suitable for operating an electrostatic paint atomizer such as a rotary atomizer. High voltage control is based on the high voltage current, as measured in the ground return path. The power supply is controlled to provide a substantially constant high voltage DC output up to a predetermined current and an output voltage which rapidly drops off as the current increases above the predetermined current. The magnitude of an AC component superimposed on the high voltage DC current is detected to determine incipient arcing. Upon detecting an incipient arcing condition, the output voltage is interrupted for a predetermined short time. When the output voltage is turned back on, it is ramped up from a low level back to the normal high voltage level. While the output voltage is less than a predetermined low level, the sensitivity of the incipient arc detection circuit is increased. The output voltage is again interrupted for the predetermined short time whenever an incipient arcing event is detected.
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