Electrical device including a voltage regulator mounted on a...

Details Electrical device including a voltage regulator mounted on a... Electrical device including a voltage regulator mounted on a...

2005-07-05

2005-07-05

Sparks, Donald (Department: 2187)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C257S712000, C361S720000

Reexamination Certificate

active

06914416

ABSTRACT:
A protection circuit for use with a charger and a chargeable element, such as a rechargeable lithium ion battery, comprises a shunt regulator having a threshold ON voltage coupled in parallel across the chargeable element, and a temperature-dependent resistor, e.g., a positive temperature coefficient device, coupled in series between the charger and the chargeable element. The temperature dependent resistor is thermally and electrically coupled to the shunt regulator, wherein the first variable resistor limits current flowing through the shunt regulator if the current reaches a predetermined level less than that which would cause failure of the regulator, due to ohmic heating of the regulator.

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