Back to results
US 6,310,461 B1Granted
Mobile telephone comprising an improved battery charger circuit
AssigneeSagem SA
InventorFernando Romao
Life of this patent
Estimating the term…
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.
Claims6
A mobile telephone comprising an improved charging circuit for a battery comprising:
- a current generator connected between a ground and a first terminal of a control device,
- a resistor connected between the first terminal and a second terminal of the control device,
- a first switch connected between the second terminal and the ground,
- a third terminal of the control device connected to a battery, wherein the resistor is series-connected, between the first terminal and the second terminal, with a second switch.
1 more element
Dependencies are inferred from the claim text.