H - Electricity – 02 – J
Patent
H - Electricity
02
J
320/11
H02J 7/00 (2006.01)
Patent
CA 1125851
ABSTRACT OF DISCLOSURE A circuit for preventing overcharging of the local battery in a carrier subscriber station terminal includes a Darlington compound having a first resistor connected between the ungrounded side of the battery (which is also connected to a battery charging circuit) and the junction of the first transistor emitter electrode with the second transistor base electrode, the transistor collector electrodes being connected to ground. The series combination of a Zener diode and a voltage divider consisting of second and third resistors is also connected across the battery, with the junction of the second and third resistors being connected to the first transistor base electrode. The diode has a Zener voltage such that when the battery voltage exceeds a prescribed voltage, the diode breaks down and the voltages across the first and third resistors are then such that both transistors are turned on to bypass a major portion of the charging current away from the local battery to prevent it being overcharged. In an alternate embodiment, the transistors are connected as a bootstrap compound.
314997
Gte Automatic Electric Laboratories Incorporated
R. William Wray & Associates
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