Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-12-24
2000-06-06
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, H02M 3335
Patent
active
060727039
ABSTRACT:
A power supplying apparatus for use in an electrophotographic apparatus. A switching device outputs an output current when a pulse of an input current is applied thereto, a switching control device controls a switching operation of the switching device by applying the pulse, and a transformer, a primary winding of which is connected with an output terminal of the switching device, generates a prescribed output voltage at its secondary winding by stepping-up an input voltage induced at the primary winding. The power supplying apparatus further includes a rectifying-smoothing device connected with the secondary part of the transformer, which rectifies and smooths an output current of the transformer, a parallel resistance member connected in parallel with the secondary winding of the transformer by the rectifying-smoothing device, and an output terminal with a first side connected with a higher potential terminal of the parallel resistance and a second side connected with a process device of the electrophotographic apparatus grounded. The switching control device controls the switching operation of the switching device in a first mode such that a prescribed amount of constant current flows through the output terminal and in a second mode such that no current flows through and a prescribed voltage is induced at the output terminal.
REFERENCES:
patent: 5132891 (1992-07-01), Kobayashi et al.
patent: 5398891 (1995-03-01), Yeh
patent: 5715149 (1998-02-01), Arikawa et al.
Ricoh & Company, Ltd.
Riley Shawn
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