Patent ID: 6100672
Filing Date: 2000-08-08
Classification: H02J

Abstract:
A battery charging system for a cellular phone, said cellular phone having a controller constructed to operate the battery charging system when enabled, said controller having a predetermined minimum operating voltage threshold, said charging system comprising:a charger for connection to the cellular phone to provide a charging current to the battery when the battery is depleted;an energy management module connected to control a start-up operation of the charger when the battery voltage falls below said operational threshold of the controller;a start-up charging module connected within the energy management module to control an initial phase of the start-up operation of the charger, said start-up charging module further comprising:a first sensor connected in operative association with the battery to sense the temperature of the battery and generate a signal relative thereto;a first comparator connected to receive the signal from the first sensor and compare said signal to a preset temperature limit;wherein the start-up module enables the supply of a limited current to the battery when the temperature of the battery is below the preset limit and disables the charger when the temperature of the battery exceeds said preset limit.