Electricity: battery or capacitor charging or discharging – Capacitor charging or discharging
Reexamination Certificate
2008-05-06
2009-11-10
Tso, Edward (Department: 2858)
Electricity: battery or capacitor charging or discharging
Capacitor charging or discharging
Reexamination Certificate
active
07615971
ABSTRACT:
The present invention provides a flash discharging circuit for simplifying the charging of electric power in a capacitor. When energy discharged from a transformer for storing and discharging energy is charged in a main capacitor of the circuit, a detection voltage inputted to a first input terminal of a comparator so as to detect a primary current flowing through a primary winding of the transformer is compared with a reference voltage inputted to a second input terminal of the comparator. According to a result of the comparison, it is detected that a predetermined primary current flows through the primary winding of the transformer. When the primary current flowing through the primary winding of the transformer is turned off, the reference voltage is set to be lower than the detection voltage.
REFERENCES:
patent: 4071884 (1978-01-01), Maigret
patent: 4422032 (1983-12-01), Kakumoto et al.
patent: 5412556 (1995-05-01), Marinus
patent: 6038143 (2000-03-01), Miyazaki et al.
patent: 6417649 (2002-07-01), Brink
patent: 6853563 (2005-02-01), Yang et al.
patent: 2003/0090240 (2003-05-01), Schenkel et al.
patent: 2002-6371 (2002-01-01), None
Canon Kabushiki Kaisha
Canon U.S.A. Inc. IP Division
Tso Edward
LandOfFree
Capacitor charging circuit, flash unit, and camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Capacitor charging circuit, flash unit, and camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitor charging circuit, flash unit, and camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4110547