Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-02-07
1998-01-20
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 23, H02J 710, H01M 1044
Patent
active
057105065
ABSTRACT:
A battery charge controller (50) is provided which includes a PWM switch controller (36) that is operable to control a switching regulator to supply current to a battery (10) in either a current regulation mode or a voltage regulation mode. A charge control (40) is operable to control the charging operation such that multiple modes of operation are selectable by an external programmable pin. The three modes provided are: a constant voltage mode, a dual-current mode and a pulse-current mode. The constant voltage mode provides for a conditioning state followed by a bulk charging state followed by a maintenance state. In the bulk charging state, current regulation is provided at a maximum current until a charged condition occurs, at which time the charger is placed in a voltage regulation mode. In the dual-current mode, the system is switched between two current regulation levels, a high current regulation level for fast charging to a substantially fully charged state of around eighty percent of rated full charge after which a low current pulsed operation is maintained during a maintenance mode. In the pulsed-current mode, current regulation is performed at the maximum current until the substantially full charged state is detected, after which the cell voltage is allowed to float until it falls below a nominal cell voltage, at which time rapid charging is again performed at a current regulated level. In this last mode, a substantially fully charged state is determined by examining the gradient of the voltage change of the charging profile to determine when a sustained negative value occurs, this indicating the onset of an increase in the pressure and temperature of the cell.
REFERENCES:
patent: 4371826 (1983-02-01), Shelly
patent: 4388582 (1983-06-01), Saar et al.
patent: 4433277 (1984-02-01), Carollo et al.
patent: 4472672 (1984-09-01), Pacholok
patent: 4491768 (1985-01-01), Slicker
patent: 4503378 (1985-03-01), Jones et al.
patent: 4584514 (1986-04-01), Kaminski
patent: 4607208 (1986-08-01), Vreeland
patent: 4638236 (1987-01-01), Carr et al.
patent: 4792743 (1988-12-01), Tsujino et al.
patent: 4829259 (1989-05-01), Konopka
patent: 4855663 (1989-08-01), Matsui et al.
patent: 4862013 (1989-08-01), Konopka
patent: 4876495 (1989-10-01), Palanisamy et al.
patent: 5166595 (1992-11-01), Leverich
patent: 5172784 (1992-12-01), Varela, Jr.
patent: 5180961 (1993-01-01), Tsujino
patent: 5192905 (1993-03-01), Karlin et al.
patent: 5198743 (1993-03-01), McClure et al.
patent: 5250891 (1993-10-01), Glasgow
patent: 5254932 (1993-10-01), Bittar et al.
patent: 5270636 (1993-12-01), Lafferty
patent: 5296797 (1994-03-01), Bartlett
patent: 5321349 (1994-06-01), Chang
patent: 5432426 (1995-07-01), Yoshida
patent: 5449997 (1995-09-01), Gilmore et al.
patent: 5469043 (1995-11-01), Cherng et al.
patent: 5475294 (1995-12-01), Isoda
patent: 5477125 (1995-12-01), Ettel et al.
"Charging the New Batteries--IC Controllers Track New Technologies", Robert A. Mammano, Unitrode IC Corp., Merrimac, NH 03054.
"Simple Switchmode Lead-Acid Battery Charger", John A. O'Connor. Unitrode Integrated Circuits, Merrimack, NH, Power Conversion, Sep. 1991 Proceedings.
"Sealed Lead-Acid Battery Charger", Unitrode Integrated Circuits, pp. 292-298, Jun. 1993.
"Charge Batteries Safely in 15 Minutes by Detecting Voltage Inflection Points", Design Feature, Sep. 1, 1994, Gary Cummings, Spectra Research, Daniel Brotton, Black & Decker Corp., and James Goodhart, Zilog, Inc.
Broell Frederick Gaudenz
Parvereshi Jehangir
Sacarisen Stephen Paul
Benchmarq Microelectronics, Inc.
Howison Gregory M.
Law Patrick B.
Wong Peter S.
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