Device for accurately detecting end of usage lifetime of a disch

Details Device for accurately detecting end of usage lifetime of a disch Device for accurately detecting end of usage lifetime of a disch

1997-03-05

1999-03-09

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315 82, 315129, H05B 3702

Patent

active

058805630

ABSTRACT:
When a discharge lamp repeatedly flickers out after illuminating for a long period of time because the same discharge lamp is nearing the end of its usage lifetime, a stored voltage of a capacitor rises gradually every time the discharge lamp flickers out. When the stored voltage of the same capacitor becomes no less than a predetermined voltage, a comparator generates a high level voltage which actuates a transistor. The transistor then terminates the operations of a PWM circuit to deactuate the discharge lamp.

REFERENCES:
patent: 4949018 (1990-08-01), Siglock
patent: 5295036 (1994-03-01), Yagi et al.
patent: 5485059 (1996-01-01), Yamashita et al.

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