Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-08-01
1997-06-03
Tso, Edward
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 61, 136293, H01M 1044, H01M 1046
Patent
active
056358164
ABSTRACT:
An automatic photovoltaic controller provides a fixed frequency, pulse width modulated charging current to charge and regulate a battery, the duty cycle of the charging current being controlled by the difference between the sensed battery voltage and a desired regulated voltage. Modulation is achieved by controlling the on and off states of plural parallel-connected FET switches placed in series between the photovoltaic array and the battery. The duty cycle is adjustable in discrete steps over the entire range of 0% to 100% and is updated numerous times per second with new battery voltage measurements to provide highly accurate regulation. The charge current pulse rise time is selected to match the response time of the photovoltaic array. The fixed frequency of the charge current is within the preferred range of 100 Hz to 600 Hz to provide sufficient time for the chemical reaction within the battery cells to be substantially completed between charge pulses during the regulation mode. Automatic protection of the controller and the load is achieved by rapidly disconnecting the battery and/or load in response to specified conditions. The photovoltaic array is disconnected from the battery at night to prevent battery discharge into the array. Equalization of the battery is performed automatically, at a voltage level slightly higher than the regulated voltage, after a predetermined number of days or if the battery voltage falls below a predetermined level.
REFERENCES:
patent: 3384806 (1968-05-01), Hartman
patent: 3531706 (1970-09-01), Mullersman
patent: 3600599 (1971-08-01), Wright et al.
patent: 3731474 (1973-05-01), Tsuruishi
patent: 3740636 (1973-06-01), Hogrefe et al.
patent: 3921049 (1975-11-01), Mellors et al.
patent: 3956687 (1976-05-01), Lindenman
patent: 4095217 (1978-06-01), Tani et al.
patent: 4143282 (1979-03-01), Berard, Jr. et al.
patent: 4173733 (1979-11-01), Sugalski et al.
patent: 4186336 (1980-01-01), Weinberg et al.
patent: 4207511 (1980-06-01), Radtke
patent: 4240021 (1980-12-01), Kashima et al.
patent: 4243928 (1981-01-01), Nazimek
patent: 4349775 (1982-09-01), Kwon et al.
patent: 4539516 (1985-09-01), Thompson
patent: 4571532 (1986-02-01), Jaster
patent: 4604567 (1986-08-01), Chetty
patent: 4626764 (1986-12-01), Weinhardt
patent: 4636931 (1987-01-01), Takahashi et al.
patent: 4661758 (1987-04-01), Whittaker
patent: 4794272 (1988-12-01), Bavaro et al.
patent: 4847546 (1989-07-01), Bobier et al.
patent: 4871959 (1989-10-01), Gali
patent: 4873480 (1989-10-01), Lafferty
patent: 5027051 (1991-06-01), Lafferty
patent: 5041952 (1991-08-01), Janda et al.
patent: 5084664 (1992-01-01), Gali
patent: 5086267 (1992-02-01), Janda et al.
patent: 5153497 (1992-10-01), Elden
patent: 5164654 (1992-11-01), Bertram et al.
patent: 5196781 (1993-03-01), Jamieson et al.
patent: 5221891 (1993-06-01), Janda et al.
patent: 5270636 (1993-12-01), Lafferty
patent: 5276393 (1994-01-01), Gali
"CC-20B Charge Controller", Heliotrope General, Aug./Sep. 1995, 3 pages.
Woodworth et al, "Evaluation of the Batteries and Charge Controllers in Small Stand-Alone Photovoltaic Systems", First World Conference on Photovoltaic Energy Conversion (WCPEC), Dec. 1994, pp. 1-13.
Harrington et al, "Battery Charge Controller Characteristics in Photovoltaic Systems", 7th Annual Battery Conference on Applications and Advances, Jan. 1992, pp. 1-8.
Galdino et al, "An Intelligent Battery Charge Controller for Small Scale PV Systems", 12th European Photovoltaic Solar Energy Conference, Apr. 1994, pp. 452-454.
McCarthy, "Concerted Action on Battery Control and Management in PV Systems", 12th European European Photovoltaic Solar Energy Conference, Apr. 1994, pp. 473-475.
Pessas et al "A Reliable Photovoltaic Battery Charge Regulator with Ideal V.sub.B ; I.sub.B ; vs t Profile" 10th European Photovoltaic Solar Energy Conference, Apr. 1991, pp. 996-999.
Decker et al "Development and Evaluation of a 20 Watt MPP Tracking Charge Controller for PV Supplied Remote Monitoring Stations", 10th European Photovoltaic Solar Energy Conference, Apr. 1991, pp. 1004-1007.
Jossen et al, "Battery Control Unit with State of Charge Indicator", 10th European Photovoltaic Solar Energy Conference, Apr. 1991, pp. 1012-1015.
Gerken Kenneth F.
Welsh Daniel
Morningstar Corporation
Tso Edward
LandOfFree
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