Discharge lamp lighting device with a delayed-output oscillation

Details Discharge lamp lighting device with a delayed-output oscillation Discharge lamp lighting device with a delayed-output oscillation

1980-03-20

1981-12-15

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315101, 315106, 315289, 315DIG2, H05B 4116

Patent

active

043061770

ABSTRACT:
A high frequency and high voltage generating circuit for a discharge lamp lighting device controls its initial output at the starting time of a discharge lamp to prevent applying a high voltage to the discharge lamp in the "cold cathode" state. The circuit comprises in combination an oscillation circuit having an oscillation capacitor, a non-linear inductor and a thyristor, and an initial output limiter for delaying the output supply until the lamp filament is sufficiently preheated for preventing sputtering and for extending the operational life of the discharge lamp. The output control is formed as a bias circuit for the nonlinear inductor and includes a thermistor with a negative or a positive temperature coefficient.

REFERENCES:
patent: 4079292 (1978-03-01), Kaneda
patent: 4165475 (1979-08-01), Pegg et al.

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