Start up frequency adjustment in an electronic power device for

Details Start up frequency adjustment in an electronic power device for Start up frequency adjustment in an electronic power device for

1981-06-25

1983-10-25

La Roche, Eugene

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315208, 315225, 315287, 315307, H05B 4136

Patent

active

044121547

ABSTRACT:
An electronic drive system for a discharge lamp is disclosed wherein the switching frequency of the chopper is reduced until the lamp striking voltage has reached about 70% of its rated value. The system includes a chopper transistor, a control for varying the transistors duty cycle and a smoothing inductance, freewheeling diode and smoothing inductor to smooth the chopper output. Current limiting is provided to prevent overcurrent within the chopper transistor, smoothing inductor or lamp.

REFERENCES:
patent: 3710177 (1973-01-01), Ward
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4060752 (1977-11-01), Walker
patent: 4240009 (1980-12-01), Paul
patent: 4259614 (1981-03-01), Kohler
patent: 4277728 (1981-07-01), Stevens

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