Ground fault detection system in a power supply for an electroma

Details Ground fault detection system in a power supply for an electroma Ground fault detection system in a power supply for an electroma

1994-09-06

1996-05-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361115, H02M 318

Patent

active

055217826

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.

REFERENCES:
patent: 4638245 (1987-01-01), MacPhee

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