PORTABLE TELECOMMUNICATIONS DEVICE

• US 20080309294A1
• Filed: 06/14/2007
• Published: 12/18/2008
• Est. Priority Date: 06/14/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Inha, Kai, Vuori, Petri, Troberg, Mikael
• Granted Patent: US 8,154,247 B2
• Time in Patent Office: Days
• US Class Current: 320/164
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A portable telecommunications device comprises a charging interface for connection to an external power supply, a voltage and current ratio converter configured to convert an input voltage at the charging interface into an output voltage for charging a battery; and a controller configured to control the converter.

Claims

1. A portable telecommunications device comprising:

a charging interface for connection to an external power supply;

a voltage and current ratio converter configured to convert an input voltage and current at the charging interface into an output voltage and current for charging a battery; and

a controller configured to control the voltage and current ratio converter.

2. A telecommunications device according to claim 1, wherein the controller is configured to monitor an input current at the charging interface and control the converter so that the input current does not exceed a maximum input current.

3. A telecommunications device according to claim 1, wherein the controller is configured to monitor the input voltage and the input current, and control the converter to maximise the input power.

4. A telecommunications device according to claim 2, wherein the controller is configured to monitor the input voltage and the input current, and control the converter to maximise the input power.

5. A telecommunications device according to claim 1, wherein the controller controls the converter such that the input current is gradually increased to the point where the input voltage starts to drop, whereby the input current is adjusted to maintain the maximum input voltage.

6. A telecommunications device according to claim 1, wherein the controller is configured to monitor an output current of the converter and control the converter to maximise the output current.

7. A telecommunications device according to claim 1, wherein the converter is a buck converter.

8. A telecommunications device according to claim 7, wherein the controller controls the duty cycle of the buck converter.

9. A telecommunications device according to claim 1, further comprising a power supply adjuster for adjusting the intake power from the power supply by adjusting properties of the power supply.

10. A method of charging a portable telecommunications device comprising:

providing an input voltage and current to a charging interface of the telecommunications device;

converting the input voltage and current at the charging interface into an output voltage and current for charging a battery according to a conversion ratio; and

controlling the conversion ratio.

11. A method according to claim 10, comprising monitoring the input current at the charging interface and controlling the conversion ratio so that the input current does not exceed a maximum input current.

12. A method according to claim 10, comprising monitoring the input voltage and the input current, and controlling the conversion ratio to maximise the input power.

13. A method according to claim 11, comprising monitoring the input voltage and the input current, and controlling the conversion ratio to maximise the input power.

14. A method according to claim 10, comprising controlling conversion ration such that the input current is gradually increased to the point where the input voltage starts to drop, whereby the input current is adjusted to maintain the maximum input voltage.

15. A method according to claim 10, comprising monitoring the output current of controlling the conversion ratio to maximise the output current.

16. A method according to claim 10, wherein the controlling the conversion ratio comprises controlling a duty cycle of a buck converter.

17. A method according to claim 10, further comprising adjusting an intake power from the power supply by adjusting properties of the power supply.