Electronic ballast and operating method for a gas discharge...

Details Electronic ballast and operating method for a gas discharge... Electronic ballast and operating method for a gas discharge...

2006-06-06

2006-06-06

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

C315S291000, C315S307000

Reexamination Certificate

active

07057358

ABSTRACT:
In an electronic ballast the output d.c. voltage (U) of a PFC intermediate circuit (3) is to be regulated. The intermediate circuit (3) has a clocked switch (S) which is controlled by a regulation circuit (7). The regulation circuit (7) includes two counters (Z1, Z2). The counter (Z1) has a greater number of count stages than the counter (Z2). The counter (Z1) is counted upwards or downwards in dependence upon the regulation difference. The counter (Z2) is repeatedly counted only in one direction and for example reset by a reset signal. By comparing the counts of corresponding count stages of the two counters (Z1) and (Z2) in a comparator, the switch on time (ton) for the clock switch (S) is determined.

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U. Tietze and Ch. Schenk, “Halbleiterschaltungstechnik”, 1991, 9thEdition, pp. 561-586.

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