Title:
電源、制御回路、画像形成装置の電源
Document Type and Number:
Japanese Patent JP5247908
Kind Code:
B2
Abstract:
A power supply unit in an image forming apparatus is provided. The power supply unit includes a piezoelectric transformer, an output voltage detecting circuit which detects the output voltage of the piezoelectric transformer, an output voltage control circuit which controls an output voltage from the piezoelectric transformer, and includes a comparator which receives an output voltage setting signal, together with an output voltage detecting signal fed back from the output voltage detecting circuit, to compare the output voltage setting signal and the output voltage detecting signal. The power supply unit also includes a driving frequency supplying circuit which generates a driving frequency signal of the piezoelectric transformer in accordance with a comparison result by the comparator, and supplies the driving frequency signal to the piezoelectric transformer. The time constant of the output voltage control circuit is longer than the time constant of the output voltage detecting circuit.
Inventors:
Osamu Nagasaki
Atsuhiko Yamaguchi
Tomohiro Nakamori
Takehiro Uchiyama
Yasukawa Koji
Teruhiko Namiki
Hiroki Murata
Atsuhiko Yamaguchi
Tomohiro Nakamori
Takehiro Uchiyama
Yasukawa Koji
Teruhiko Namiki
Hiroki Murata
Application Number:
JP2012062122A
Publication Date:
July 24, 2013
Filing Date:
March 19, 2012
Export Citation:
Assignee:
Canon Inc
International Classes:
G03G21/00; G03G21/14; H02M3/24
Domestic Patent References:
| JP11206113A | ||||
| JP1174094A | ||||
| JP11187672A | ||||
| JP984335A | ||||
| JP200264977A | ||||
| JP200137218A |
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa
Previous Patent: JPS5247907
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