Discharge lamp lighting apparatus for controlling voltage of swi

Details Discharge lamp lighting apparatus for controlling voltage of swi Discharge lamp lighting apparatus for controlling voltage of swi

1989-11-30

1992-02-11

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Surge generator or inductance in the supply circuit

315219, 315DIG7, H05B 3702

Patent

active

050878620

ABSTRACT:
A discharge lamp lighting apparatus of this invention includes an inverter circuit and a control circuit connected to a power source rectifier for supplying a D.C. voltage. The inverter circuit includes a parallel voltage resonance circuit of an output transformer and a resonance capacitor and the output side of the output transformer is connected to a discharge lamp and a timer circuit. The inverter circuit further includes a switching transistor for switching the D.C. power source and a voltage detection circuit for detecting a voltage V.sub.CE between the collector and emitter of the switching transistor. In the start-up operation of the discharge lamp, the control circuit raises the control level of V.sub.CE of the switching transistor so as to set the output voltage of the inverter circuit high until it receives a signal which is output after a preset time determined by the timer circuit has elapsed, and under this condition, the discharge lamp is started.

REFERENCES:
patent: 4339695 (1982-07-01), Siglock
patent: 4403173 (1983-09-01), Mayer
patent: 4495446 (1985-01-01), Brown
patent: 4587460 (1986-05-01), Murayama
patent: 4803406 (1989-02-01), Yasuda
patent: 4881011 (1989-11-01), Britton
patent: 4992702 (1991-02-01), Shimizu

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