Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1995-12-07
1997-08-05
Pascal, Robert
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315DIG7, 315224, 315219, H05B 3702
Patent
active
056546114
ABSTRACT:
A lamp current i.sub.L flows through a first resistor. Electric current I, which is the output current of a voltage-current converter which converts a lamp voltage V.sub.L to a lamp current I, flows through a second resistor. Feedback control is executed to make V.sub.-, which is the voltage of one terminal of the second resistor, equal a reference voltage V.sub.ref. The power applied to the lamp during start-up is controlled to be the same as the power applied to the lamp during its stable lighting for a predetermined lamp voltage range. Using the following two linear equations, the electric current I is set as I=aV.sub.L +b (where a and b are positive constants) when the lamp voltage V.sub.L is lower than a first predetermined voltage V.sub.a which is less than the lamp voltage during the normal stable lighting period of the lamp, and as I=cV.sub.L +d (where c and d are positive constants with c<a and d>b), when the lamp voltage V.sub.L is greater than or equal to the first predetermined value V.sub.a.
REFERENCES:
patent: 5481163 (1996-01-01), Nakamura et al.
Ishikawa Masamichi
Yamamoto Noboru
Yoneima Kenji
Nippondenso Co. Ltd.
Pascal Robert
Shingleton Michael
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