Lithium electronic-mechanical automatic protection system (LEAPS

Details Lithium electronic-mechanical automatic protection system (LEAPS Lithium electronic-mechanical automatic protection system (LEAPS

1996-02-23

1999-02-23

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 84, 361 90, 361115, H02H 700

Patent

active

058750851

ABSTRACT:
This device includes, connected in parallel with each of the elements (I, II), corresponding shunt regulators (S11, R11, S21, R21) linked together in series, and the control electrodes of which are connected to networks of resistors which represent voltages of the elements which can be applied to respective comparators (C11, C12, C21, C22) of the lower and upper threshold voltages (Vth11, Vth12, Vth21, Vth22) of the elements with a reference voltage delivered by a reference voltage source (Vref), a switching MOSFET transistor (4), with low conduction resistance and with defined off-state impedance, connected between the most negative terminal of the set of elements (II) in series and the negative terminal (Vbat-) of the protection device and means of control of the MOSFET transistor from output signals from the comparators (C11, C12, C21, C22) in order to alter the state of the said MOSFET transistor (4) for the purpose of regulating the state of charge and of discharge of the elements (I, II). It makes it possible to use a common charger for NiCd and NiMH elements.

REFERENCES:
patent: 3867682 (1975-02-01), Yamauchi
patent: 4006397 (1977-02-01), Catotti
patent: 4281277 (1981-07-01), Lakey
patent: 4777387 (1988-10-01), Collins
patent: 4965738 (1990-10-01), Bauer et al.
patent: 5545491 (1996-08-01), Farley
Patent Abstracts of Japan, vol. 007, No. 186 (E-193), Aug. 16, 1983 & JP-A-58 089866 (Hitachi Seisakusho KK), May 28, 1983, figures 2,3.

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