Electronic ballast with ground-fault protection

Details Electronic ballast with ground-fault protection Electronic ballast with ground-fault protection

1985-04-05

1987-05-05

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315DIG5, 315DIG7, 315242, 361 42, 361 45, 363 50, 363 56, H05B 3700, H05B 3900, H05B 4114

Patent

active

046635718

ABSTRACT:
An electronic ballast is adapted for operation on regular 120 Volt/60 Hz power line voltage and comprises: (i) full bridge rectifier means, (ii) ripple filter means consisting of an LC circuit series-resonant at 120 Hz, (iii) push-pull inverter means operating into an LC output circuit parallel-resonant at about 30 kHz and operative to provide a 30 kHz voltage at an output that is substantially balanced with respect to ground, and (iv) means to disable the inverter in case a 30 kHz ground-fault current flows from this output. A key element in achieving high efficiency relates to the use of ground-fault interruption to achieve the required safety from electric shock hazard, thereby obviating the need for the more conventionally used isolation transformer with its attendant added cost and inefficiency.

REFERENCES:
patent: 4277726 (1981-07-01), Burke
patent: 4345289 (1982-08-01), Howell
patent: 4563719 (1986-01-01), Nilssen
patent: 4613934 (1986-09-01), Pacholok

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