Method and apparatus for controlling power supplied to an electrostatic device
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United States of America Patent
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Aug 20, 2002
Grant Date -
N/A
app pub date -
Sep 24, 1999
filing date -
Sep 24, 1999
priority date (Note) -
Expired
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Abstract
A method and apparatus for providing power to an electrostatic device includes a monitor and control system that prevents inadvertent and damaging electrical arcing. When the electrostatic device is first energized, voltage is gradually increased and the flow of electrical current is closely monitored. In the event the device is too close to ground or a grounded object, current flow exceeds a predetermined threshold and power is disconnected from the electrostatic device. Later, as the device voltage is increased to operating voltage, electrical current delivered to the electrostatic device is monitored for excessive current and excessive rate of change. If either fault condition is detected, power supply voltage may be reduced or disconnected, depending upon the severity of the fault. A microprocessor control system is illustrated for implementing the invention, including hardware and various software algorithms that provide the requisite gathering of information, analysis and responsive actions.
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