Discharge lamp energization circuit, particularly for audio and

Details Discharge lamp energization circuit, particularly for audio and Discharge lamp energization circuit, particularly for audio and

1980-03-05

1981-09-22

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Electric switch in the condenser circuit

315208, 315226, 315287, 315307, 315DIG7, H05B 4136

Patent

active

042912547

ABSTRACT:
Discharge lamp energization circuit to operate a discharge lamp 1 over two electronic switches 10, 11, for example high-voltage, high-current switching transistors, which alternately apply a d-c voltage connected across two capacitors 4, 5, in opposite polarity, to the lamp circuit. The capacitors have the same value, and the lamp circuit includes a serially connected inductance. The electronic switching transistors are supplied from a frequency constant square-wave generator 16, at frequency high with respect to power line frequency, for example within the audio or supersonic range, e.g. 7.5 kHz. A separate ignition or starting circuit may be provided or the series inductance 2 and a capacitor 20 connected in parallel with the lamp may form a series resonance circuit tuned to a low odd harmonic (3, 5 7) of the lamp operating frequency.

REFERENCES:
patent: 3710177 (1973-01-01), Ward
patent: 3733541 (1973-05-01), Elms
patent: 4170747 (1979-10-01), Holmes

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