Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1996-10-15
1998-01-27
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 50, H02M 545
Patent
active
057127735
ABSTRACT:
A power supply apparatus for a gas tube including: a first rectifying portion for bridge-rectifying an alternating current input thereto into a direct current, a second rectifying portion for bridge-rectifying the output voltage of the first rectifying portion into a direct current again, a switching means for receiving stable power from the second rectifying portion and for controlling the operation of a high voltage transformer driving portion, an oscillating frequency and duty cycle ratio controller for controlling the oscillating frequency and duty cycle ratio of the switching means, the high voltage transformer driving portion selectively interrupting a flow of current of the high voltage transformer in accordance with the output of the switching means, and a high voltage output preventing portion for halting the operation of the frequency oscillation and duty cycle ratio controller by being turned on when a secondary side center tap voltage of the high voltage transformer is detected to be beyond a particular voltage. Water drop formation on the surface of the neon tube and also the blackening phenomenon of the argon tube are prevented by controlling the oscillation frequency and duty cycle ratio in a gas-tube power supply apparatus for a neon tube or an argon tube.
REFERENCES:
patent: 4839915 (1989-06-01), Kaneko et al.
patent: 4903183 (1990-02-01), Noguchi et al.
patent: 5227964 (1993-07-01), Furuhata
patent: 5631814 (1997-05-01), Zak
patent: 5633787 (1997-05-01), Song
Bushnell Esq. Robert E.
Han Y. J.
Wong Peter S.
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