Electronic ballast with two-transistor switching device

Details Electronic ballast with two-transistor switching device Electronic ballast with two-transistor switching device

1993-08-18

1995-06-20

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

054263492

ABSTRACT:
A current-fed parallel-resonant self-oscillating electronic ballast includes four special switching devices, each serving the function of a single switching transistor in a full-bridge inverter. Each special switching device includes two series-connected field effect transistors synchronously gated via positive feedback of a sinusoidal output voltage. The reason for using two series-connected field-effect transistors in lieu of a single field-effect transistor of higher voltage rating relates to the fact that, for the DC supply voltages associated with certain electronic ballast circuits powered from commonly encountered power line voltages, field-effect transistors of lower voltage ratings (e.g., 400 Volt) are substantially lower in cost per-unit Volt-Ampere rating as compared with field-effect transistors of higher voltage ratings (e.g., 800 Volt). Thus, although such higher-voltage transistors are readily available, the net overall ballast cost will nevertheless be significantly reduced by using the special switching devices.

REFERENCES:
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patent: 5208740 (1993-05-01), Ehsani
patent: 5315215 (1994-05-01), Lesea

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