Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1997-12-03
1999-06-22
Leja, Ronald W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 93, 315DIG7, H02H 300
Patent
active
059148438
ABSTRACT:
A power supply power supply circuit of the kind which includes a transformer having primary and secondary windings and an oscillator for driving the primary winding in a bi-directional fashion, suitable for driving gas discharge lighting such as neon signs, which prevents dangerous overvoltage output conditions and detects relatively low level ground fault currents. The transformer includes a clamp winding which is in proximity to and capacitively coupled to the secondary winding. The terminals of the clamp winding are connected to a current imbalance detection circuit for detecting imbalance between the current flowing into one clamp winding terminal and the current out of the other clamp winding terminal. In a ground fault condition, ground fault current flows in an unbalanced fashion into the clamp winding terminal(s), and through the capacitive coupling to the secondary winding. This ground fault current is detected by the current imbalance detection circuit, causing the current imbalance detection circuit to generate an electrical signal indicative of ground fault current, which shuts down the oscillator.
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Efantis, Tony, Ground-Fault Protection on Neon Secondaries, Signs of the Times, Jul. 1996, pp. 130-133, 188.
Dean Thomas Eugene
Hopkins William Thomas
France/Scott Fetzer Company
Leja Ronald W.
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