Ballast circuit equipped with ground fault detector

Details Ballast circuit equipped with ground fault detector Ballast circuit equipped with ground fault detector

1993-09-16

1994-11-08

Pascal, Robert J.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Supply circuit current and/or potential actuated switch

315219, 315224, 315DIG5, 315DIG7, H05B 3700

Patent

active

053630181

ABSTRACT:
A ballast circuit (100) includes a ground fault detector (200). The ballast circuit is arranged for coupling to a power source (101) and a load (135, 137), the power source characterized by a source frequency, the ballast circuit including an electromagnetic interference ("EMI") filter (110) which includes a ground terminal (145). The ground fault detector (200) determines when the load is coupled to a ground fault (141) by detecting the presence of a high-frequency current at the ground terminal, the high-frequency current characterized by a frequency that is substantially greater than the source frequency. When the high-frequency current is detected, the ground fault detector provides an output signal (150) which may be used to disconnect the load from the ballast circuit.

REFERENCES:
patent: 4939427 (1990-07-01), Nilssen
patent: 5041766 (1991-08-01), Fiene et al.
patent: 5049787 (1991-09-01), Nilssen

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