Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1994-07-22
1997-09-16
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 49, 307 66, H02J 700, H01M 1046
Patent
active
056684630
ABSTRACT:
A circuit is provided for controlling charge (or discharge) of an auxiliary battery using an auxiliary battery charge control circuit of improved design. The auxiliary battery charge control circuit is coupled between an auxiliary battery and a main battery for regulating charge and discharge of the auxiliary battery. The auxiliary battery control circuit includes a pair of voltage dividers coupled between ground potential and the main battery, and a pair of comparators having a mutually connected output. The inputs of the pair of comparators are connected to a reference voltage and the pair of voltage dividers. The output of the comparators is connected to a switch transistor, and the switch transistor modulates a battery connected transistor coupled between the main battery and the auxiliary battery. When the main battery voltage exceeds a maximum voltage level or is less than a minimum voltage level, then the comparators turn off the switch transistor, and the switch transistor correspondingly turns off the battery connected transistor causing disconnect of the main battery from the auxiliary battery. Conversely, if the main battery voltage is between the upper and lower voltage limits, then comparator output will cause switch transistor and battery connect transistor to turn on thereby connecting main battery to the auxiliary battery. A reference voltage and resistor values within voltage divider networks are chosen according to user-defined application for setting the upper and lower voltage limits necessary for connecting or disconnecting auxiliary battery from main battery.
REFERENCES:
patent: 5028806 (1991-07-01), Stewart et al.
patent: 5155428 (1992-10-01), Kang
patent: 5167024 (1992-11-01), Smith et al.
"Static n-Mos Ram Idles On the trickle current", F.A. Scherpenberg, Electronics International, vol. 53, No. 2, Jan. 27, 1981, New York, pp. 129-132, XP002012803.
Advanced Micro Devices , Inc.
Daffer Kevin L.
Law Patrick B.
Wong Peter S.
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