Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-08-18
1991-07-02
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 95, 363 97, 363 49, 315291, 315DIG2, 315DIG5:DIG.7, H02M 3335, H05B 3702, H05B 3904, G05F 100
Patent
active
050290614
ABSTRACT:
A circuit 10 for supply a fluorescent tube 12 comprises a power supply 14 which modulates the mains supply at 24 to produce a DC supply at 16. A relay J and a switch S2 apply the DC supply to a terminal 38. The power supply 14 also supplies a charging current at 30 to a battery pack 32. The supply at 38 powers an oscillator circuit 18 which incorporates inductors L1, L2 which are windings on a transformer 20. A secondary winding 22 taps the transformer 20 to supply the tube 12. A third winding L3 detects the voltage being applied to the tube 12 and a feedback circuit 40 controls the output amplitude of the oscillator 18 in order to maintain a constant supply voltage to the tube 12.
REFERENCES:
patent: 4673826 (1987-06-01), Masson
patent: 4694224 (1987-09-01), Nakagawa et al.
patent: 4698741 (1987-10-01), Pacholok
patent: 4700113 (1987-10-01), Stupp et al.
patent: 4788451 (1988-11-01), Stoet
patent: 4806830 (1989-02-01), Ueki
Stephan Steven L.
Voeltz Emanuel T.
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