Ground fault detection system in a power supply for an electromagnetic riveting apparatus
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United States of America Patent
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May 28, 1996
Issued Date -
N/A
app pub date -
Sep 6, 1994
filing date -
Apr 10, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The power supply, useful with an electromagnetic force apparatus such as a riveter or a bolt inserter, includes two capacitor banks which are charged through charging doubler modules. Each charging doubler module includes an AC capacitor which is responsive to a power source. The AC capacitor is connected to a node point between two diode elements, which are connected in series across the capacitor bank. An analog-to-digital converter converts the voltage on the capacitor bank to a digital voltage for comparison with a selected digital charge voltage in a controller. The selected digital charge voltage may vary over time by means of a compensating algorithm. A ground fault indicator using a biasing voltage is connected between a selected electrical circuit portion of the force apparatus and earth ground. A gas discharge tube in combination with a current sensing element is connected to the capacitor banks to determine a possible over-voltage condition. A Hall-effect sensor is mounted between bus connections which carry the current between the capacitor bank and a coil portion of the electromagnetic force apparatus to determine the current flowing into the coil by measurement of the magnetic field between the bus bars.
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