High-reliability high-efficiency electronic ballast

Details High-reliability high-efficiency electronic ballast High-reliability high-efficiency electronic ballast

1985-04-05

1987-06-23

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315DIG5, 315DIG7, 315232, 361 42, 361 45, 363 50, 363 56, H05B 3700, H05B 3900, H05B 4114

Patent

active

046755764

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) self-oscillating inverter means operating into an LC output circuit parallel-resonant at about 30 kHz, and (iv) means to disable the inverter in case a 30 kHz ground-fault current flows from its output circuit. A key element in achieving high reliability as well as high durability relates to the use of the series-resonant LC circuit instead of the conventional electrolytic capacitor for DC voltage ripple filtering. 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: 3506906 (1970-04-01), Nestor
patent: 4277726 (1981-07-01), Burke
patent: 4507698 (1985-03-01), Nilssen
patent: 4523131 (1985-06-01), Zansky
patent: 4563719 (1986-01-01), Nilssen
patent: 4613934 (1986-09-01), Pacholok

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