Universal high intensity discharge electronic starter

Details Universal high intensity discharge electronic starter Universal high intensity discharge electronic starter

1996-08-30

1998-08-25

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315244, 315DIG7, H05B 3702

Patent

active

057986150

ABSTRACT:
An electronic starter for high intensity discharge devices, such as mercury vapor, high pressure sodium, and metal halide lamps. The present invention includes voltage controlled oscillator with a resonant frequency that is determined by the direct voltage applied and by a resonance circuit that includes the high intensity device as part of the resonance circuit. A higher frequency of oscillation is present upon start-up before the device is ionized of approximately 300 kilohertz. After that, the high intensity device shunts out one of the capacitance reactive elements lowering the circuit's Q and maintaining an operating frequency that oscillates between 20 and 100 kilohertz. The inductive element acts as a current limiting device and a protection circuit is provided to monitor the voltage across the lamp and to disable the oscillator if abnormal conditions are detected including removal of the lamp.

REFERENCES:
patent: 4723098 (1988-02-01), Grubbs
patent: 5051662 (1991-09-01), Counts
patent: 5057752 (1991-10-01), Grabner et al.
patent: 5412287 (1995-05-01), Shackle
patent: 5416388 (1995-05-01), Shackle

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