Dual battery system control circuit

Details Dual battery system control circuit Dual battery system control circuit

1995-08-10

1998-03-10

Tso, Edward

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 12, 320 13, H01M 1046

Patent

active

057265534

ABSTRACT:
Dual batteries having a CRAnking battery and an AUXiliary battery require a switch to the alternator and to disconnect the auxiliaries before the battery becomes depleted. The switch measures the AUXiliary battery's state of charge during alternator charging. The switch opens to prevent overcharging and to preserve the CRAnking battery charge while allowing the AUXiliary battery to discharge preferentially. The switch instructs the alternator to select a burst, float or top up charging voltage depending on the AUXiliary battery state of charge. The switch uses microprocessor control. This utilizes tables to interpret circuit values. A 3-axis graph relates discharge current and voltage with state of charge.

REFERENCES:
patent: 5154985 (1992-10-01), Tanaka
patent: 5162164 (1992-11-01), Dougherty et al.
patent: 5164273 (1992-11-01), Szasz et al.
patent: 5256502 (1993-10-01), Kump
European Patent Abstracts, Week 9247, p. 114, Abstract of EP 513531-A1, published Nov. 19, 1992.
Japanese Publication 5-258656-A, published Aug. 10, 1993, Abstract only.
Patent Abstracts of Japan, Group M185, vol. 7, No. 9, Published Jan. 14, 1983, Japanese Publication 57-167844, published Oct. 15, 1982, Abstract only.

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