Frequency shift inverter for variable power control

Details Frequency shift inverter for variable power control Frequency shift inverter for variable power control

1980-08-14

1982-08-24

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315244, 315291, 315DIG4, H05B 4129, H05B 41392

Patent

active

043463320

ABSTRACT:
A variable frequency AC power source drives a gas discharge lamp which is connected in parallel with the capacitance of a series resonant circuit. The polarity of the voltage applied to the resonant circuit is commutated at such times as the rate-of-change of current flow in the resonant circuit is below an adjustable threshold value. The setting of a threshold adjusting circuit determines the brightness of the lamp. The polarity is also commutated at such times as the current flow from the source reaches a predetermined level. Lamp current is thus independently and variably controlled in the variable power mode.

REFERENCES:
patent: 3781638 (1973-12-01), Anderson et al.
patent: 3967159 (1976-06-01), Dendy et al.
patent: 4060752 (1977-11-01), Walker
patent: 4207497 (1980-06-01), Capewell
patent: 4207498 (1980-06-01), Spira
patent: 4210846 (1980-07-01), Capewell et al.

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