Patent Number: 6,310,461

Title: Mobile telephone comprising an improved battery charger circuit

Abstract: The leakage current in a circuit for charging a battery is eliminated by placing a switch in series with the resistor connecting the emitter and the base of a transistor. When this switch is open the current can no longer flow through and there is therefore no longer any leakage current. This switch is controlled by a microprocessor through a bus and the battery can be charged in pulsed mode. Furthermore, the circuit has no protection diode against reverse voltage and over voltage.

Inventors: Romao; Fernando (Montesson, FR)

Assignee: Sagem SA

International Classification: H02J 7/00 (20060101); A42J 007/00 ()

Expiration Date: 10/30/2018