Ground-fault-protected series-resonant ballast

Details Ground-fault-protected series-resonant ballast Ground-fault-protected series-resonant ballast

1989-01-23

1990-07-03

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315224, 315311, 315DIG4, 315DIG5, 315DIG7, 361 42, 363 95, 363132, H05B 3702, H05B 3904, H05B 4136

Patent

active

049394274

ABSTRACT:
A self-oscillating half-bridge inverter is powered from a power-line-operated DC voltage source and has a series-tuned high-Q LC circuit connected across its output. A pair of fluorescent lamps is series-connected across the tank capacitor of the LC circuit. An EMI filter is positioned between the inverter and the power line, thereby to minimize electro-magnetic interference. This same EMI filter also acts to produce a control signal in case a ground fault current were to occur; which control signal is used for preventing the magnitude of the ground-fault current from exceeding acceptable limits.

REFERENCES:
patent: Re32904 (1989-04-01), Pacholok
patent: 4004187 (1977-01-01), Walker
patent: 4005335 (1977-01-01), Perper
patent: 4101806 (1978-07-01), Alley
patent: 4340843 (1982-07-01), Anderson
patent: 4507698 (1985-03-01), Nilssen
patent: 4538095 (1985-08-01), Nilssen
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4567404 (1986-01-01), Flugan
patent: 4684850 (1987-08-01), Stevens
patent: 4692667 (1987-09-01), Nilssen
IEEE Standard Dictionary of Electrical and Electronics Terms Third Edition p. 220.

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