Driven full-bridge inverter ballast

Details Driven full-bridge inverter ballast Driven full-bridge inverter ballast

1993-09-03

1995-08-08

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315226, 315DIG5, H05B 4129

Patent

active

054402093

ABSTRACT:
In an electronic ballast for Rapid-Start fluorescent lamps, each one of two of the four transistors in a full-bridge inverter is driven from a commercially available timer by way of simple diode-resistor parallel-combination. Each one of the other two transistors is driven directly from an auxiliary winding on the full-bridge inverter's power output transformer. The fluorescent lamps are series-connected with a current-limiting inductor to form a series-combination; which series-combination is connected across an output winding of the power output transformer. Heating voltage for each of the lamps' cathodes is obtained by way of two series-connected windings: one one the power output transformer and one on the current-limiting inductor. The magnitude of the resulting cathode heating voltage is substantially higher prior to lamp ignition as compared with after lamp ignition.

REFERENCES:
patent: 4388563 (1983-06-01), Hyttin
patent: 4396866 (1983-08-01), Bay et al.
patent: 4408270 (1983-10-01), Anderson et al.

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