Safety protector for non-isolated ballasts

Details Safety protector for non-isolated ballasts Safety protector for non-isolated ballasts

1995-10-06

1997-06-24

Pascal, Robert

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315310, 315348, 315126, H05B 3700

Patent

active

056420196

ABSTRACT:
A protection circuit for non-isolated ballasts that drive gas discharge lamps to prevent shock hazards. The device acts to prevent excessive leakage currents from flowing between the ballast and ground by introducing a higher common mode impedance path in the circuit. A two stage common mode filter assembly has a first common mode inductor series connected to a second common mode inductor. A first capacitor is connected across the common mode inductors. A second capacitor is connected between the junction of the first capacitor, the first inductor, the second inductor and ground. The circuit protects by reducing high frequency leakage currents.

REFERENCES:
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patent: 4422056 (1983-12-01), Roberts
patent: 4427955 (1984-01-01), Roberts
patent: 4507698 (1985-03-01), Nilssen
patent: 4855860 (1989-08-01), Nilssen
patent: 4888675 (1989-12-01), Kumar et al.
patent: 4902942 (1990-02-01), El-Hamamsy
patent: 4943886 (1990-07-01), Quazi
patent: 5010277 (1991-04-01), Courier De Mere
patent: 5225741 (1993-07-01), Auld, Jr. et al.
patent: 5313176 (1994-05-01), Upadhyay
patent: 5449981 (1995-09-01), Auld, Jr. et al.
patent: 5568041 (1996-10-01), Hesterman
MTI Ballast MB-232-120-RS-T8M Schematic by Tom Poehlman, Mar. 30, 1995.

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