Patent ID: 6020721
Filing Date: 2000-02-01
Classification: H02J

Abstract:
A temperature monitoring device for determining the temperature of a battery pack being charged in a charging device, said charging device including a charging terminal, said monitoring device comprising:an ambient temperature sensor positioned to sense ambient temperature within the battery charger and providing a temperature signal of the sensed ambient temperature;a terminal temperature sensor positioned to sense the temperature of the charging terminal and providing a temperature signal indicative of the temperature of the terminal;a temperature monitoring circuit responsive to the temperature signals from the ambient temperature sensor and the terminal temperature sensor, said temperature monitoring circuit providing output signals indicative of the temperature signals; andcontroller means responsive to the output signals from the monitoring circuit for determining the temperature of the battery pack based on the temperature signals in accordance with the equation:T.sub.BATT =C.sub.1 T.sub.1 +C.sub.2 T.sub.0 +C.sub.3 T.sub.A +C.sub.4where,T.sub.BATT is the temperature of the battery pack;T.sub.0 is the temperature of the charging terminal before the battery pack is inserted into the charging device;T.sub.1 is the temperature of the charging terminal after the battery pack is inserted into the charging device; andT.sub.A is the ambient temperature within the battery charger.