Power-line-isolated dimmable electronic ballast

Details Power-line-isolated dimmable electronic ballast Power-line-isolated dimmable electronic ballast

1991-05-22

1992-01-28

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315220, 315224, 315282, 315307, 315324, 315DIG7, H05B 4129

Patent

active

050846531

ABSTRACT:
In an electronic ballast for powering three series-connected fluorescent lamps with a 30 kHz lamp current, a half-bridge series-resonance-type inverter circuit is powered from a substantially constant-magnitude DC supply voltage derived from ordinary 60 Hz power line voltage by way of a bridge rectifier and a single-transistor DC-to-DC converter using an energy-storing inductor with an isolated secondary winding from which the DC supply voltage is derived. Thus, the DC supply voltage is electrically isolated from the power line, as is also the inverter circuit itself as well as the ballast's output terminals. Lamp dimming is accomplished via a dimming control directly connected with the inverter circuit.

REFERENCES:
patent: 4972126 (1990-11-01), Nilssen

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