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1. WO2002023664 - BATTERY CELL CHARGING SYSTEM HAVING VOLTAGE THRESHOLD AND BLEEDER CURRENT GENERATING CIRCUITS

Publication Number WO/2002/023664
Publication Date 21.03.2002
International Application No. PCT/US2001/027637
International Filing Date 06.09.2001
IPC
H01M 10/44 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
44Methods for charging or discharging
CPC
H01M 10/44
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
44Methods for charging or discharging
H02J 7/0016
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
7Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
0013acting upon several batteries simultaneously or sequentially
0014Circuits for equalisation of charge between batteries
0016using shunting, discharge or bypass circuits
Y02E 60/10
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
60Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
10Energy storage using batteries
Applicants
  • O2 MICRO, INC. [US]/[US]
Inventors
  • POPESCU, Serban-Mihai
Agents
  • PFLEGER, Edmund, Paul
Priority Data
09/658,74711.09.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) BATTERY CELL CHARGING SYSTEM HAVING VOLTAGE THRESHOLD AND BLEEDER CURRENT GENERATING CIRCUITS
(FR) SYSTEME DE CHARGE D'ELEMENTS D'ACCUMULATEUR, COMPRENANT DES CIRCUITS DE SEUIL DE TENSION ET DE PRODUCTION DE COURANT DE FUITE
Abstract
(EN)
A balanced battery cell charging circuit is provided. The circuit includes a comparator for comparing the voltage of a battery cell to a predetermined threshold voltage. If the cell voltage exceeds the threshold value, a bleeder current is generated. In one preferred embodiment, the bleeder current is subtracted from the charging current. In another embodiment, the bleeder current is multiplied, and the multiplied bleeder current is subtracted from a total charging current supplied to the cell. To control the charger circuit, current feedback is provided by monitoring the bleeder current generated against a maximum bleeder current, and adjusting the charging current accordingly. The topology of the present invention provides active cell balancing between cells of a battery, and low total power dissipation of the circuit.
(FR)
L'invention concerne un circuit équilibré de charge d'éléments d'accumulateur. Ce circuit comprend un comparateur, servant à comparer la tension d'un élément d'accumulateur avec une tension de seuil déterminée. Si la tension de l'élément dépasse la valeur seuil, un courant de fuite est produit. Dans un mode de réalisation préféré, le courant de fuite est soustrait du courant de charge. Dans un autre mode de réalisation, le courant de fuite est multiplié et ce courant multiplié est soustrait d'un courant de charge total fourni à l'élément. Pour la commande du circuit de charge, une rétroaction de courant est fournie par surveillance du courant de fuite produit, par rapport à un courant de fuite maximal, et par réglage du courant de charge en conséquence. La topologie de l'invention apporte un équilibre d'élément actif entre les éléments d'un accumulateur, et une dissipation de puissance totale faible du circuit.
Also published as
RU20022002129299
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