DISCHARGE LAMP LIGHTING DEVICE WITH A DELAYED-OUTPUT OSCILLATION CIRCUIT

摘要

TITLE OF THE INVENTION: DISCHARGE LAMP LIGHTING DEVICE WITH A DELAYED-OUTPUT OSCILLATION CIRCUIT 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 nonlinear 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. 1511/DIV/ar - 1