Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1988-02-26
1991-08-27
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 23, 320 36, 363132, H02J 704
Patent
active
050436503
ABSTRACT:
An isolated battery charger suitable for charging lead-acid batteries includes a high-frequency power conditioner that rectifies source current to a DC value and chops the current at a comparatively high frequency, e.g., 25 KHz, using a pair of MOSFET switches (138 and 140) to provide power pulses to the primary of a step-down transformer (T.sub.1). The output of the step-down transformer (T.sub.1) is presented to an enhancement mode MOSFET (206) in series circuit with the battery (B) to be charged with the gate bias of the MOSFET controlled in response to the sensed voltage of the battery to provide current to the battery as a function of its charge. Control circuitry is provided to limit charging to a small `trickle` level in the event the battery (B) is fully discharged to increase its charge level prior to initiating the full charge current. The provision of a voltage converter (100) operating at a relatively high frequency allows use of a lightweight and compact transformer (T.sub.1) that nonetheless provides a high current for charging.
REFERENCES:
patent: 3735233 (1973-05-01), Ringle
patent: 3919618 (1975-11-01), Coleman et al.
patent: 3967168 (1976-06-01), Ellenberger
patent: 4021717 (1977-05-01), Furuishi et al.
patent: 4092711 (1978-05-01), Gerding et al.
patent: 4196361 (1980-04-01), Nakata
patent: 4196469 (1980-04-01), Gurwicz
patent: 4227243 (1980-10-01), Gurwicz et al.
patent: 4243929 (1981-01-01), Lenart
patent: 4270080 (1981-05-01), Kostecki
patent: 4321523 (1982-03-01), Hammel
patent: 4327317 (1982-04-01), Heine et al.
patent: 4333134 (1982-06-01), Gurwicz
patent: 4353112 (1982-10-01), Rietveld et al.
patent: 4398140 (1983-08-01), Horishita
patent: 4426612 (1984-01-01), Wicnienski et al.
patent: 4531083 (1985-07-01), Hoffman
patent: 4536696 (1985-08-01), Ray
patent: 4558407 (1985-12-01), Sterner
patent: 4564800 (1986-01-01), Jurjans
patent: 4629965 (1986-12-01), Fallon et al.
patent: 4649333 (1987-03-01), Moore
patent: 4670703 (1987-06-01), Williams
patent: 4682262 (1987-07-01), Monsell
"Automatic Battery Charger"-ELEKTOR (Jul./Aug. 1979) 1, vol. 51/52, No. 7-8 (2 pages).
Elektor, No. 60, Apr. 1980, Canterbury GB--"Automatic Battery Charger".
N. T. I. S. Tech Notes, Feb. 1987, Springfield, VA., U.S.A.--p. 150 W. T. McLyman--"Ferroresonant Flux-Coupled Battery Charger" (NASA Tech Brief).
Bhagwat Pradeep M.
Gilmore Alan A.
Watts Fred S.
Black & Decker Inc.
Hoofnagle J. Bruce
Peckman Kristine
Stephan Steven L.
LandOfFree
Battery charger does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Battery charger, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Battery charger will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1416904