John K Ko

US Patent:

7656132, Feb 2, 2010

Filed:

Nov 14, 2006

Appl. No.:

11/559790

Inventors:

John Sung Ko So - Fremont CA, US
David Alan Brown - San Jose CA, US

Assignee:

Advanced Analogic Technologies, Inc. - Santa Clara CA

International Classification:

H02J 7/06
H02J 7/24

US Classification:

320164, 320134

Abstract:

A battery charger apparatus for charging a battery, comprises a charge-current control circuit for receiving a charge-current control signal to control an amount of charge current being drawn from an input source, e. g. , a USB port or a line adapter; an analog control circuit for generating an analog control signal representative of a maximum amount of charge current to be used to charge a battery; a digital charge reduction loop including a circuit for determining a charge-current adjustment signal based on a source voltage of the input source; a counter for generating a digital count value based on the charge-current adjustment signal; and a digital-to-analog converter (DAC) for generating a DAC control signal based on the digital count value of the counter, the DAC control signal being representative of a reduced amount of charge current to be used to charge the battery; and a switching mechanism for selecting one of the analog control signal or the DAC control signal based on the source voltage, the selected control signal being used as the charge-current control signal to the charge-current control circuit.

US Patent:

7923972, Apr 12, 2011

Filed:

Dec 4, 2009

Appl. No.:

12/631768

Inventors:

John Sung Ko So - Fremont CA, US
David Alan Brown - San Jose CA, US

Assignee:

Advanced Analogic Technologies, Inc. - Santa Clara CA

International Classification:

H02J 7/06
H02J 7/24

US Classification:

320164, 320134

Abstract:

Exemplary systems and methods for charging a battery with a digital charge reduction loop are described herein. In some embodiments, a system comprises an exemplary digital charge reduction loop which comprises a circuit for determining a charge-current adjustment signal, a counter for generating a digital count value, and a digital-to-analog converter. The circuit for determining a charge-current adjustment signal may base the determination on a source voltage of an input source. The counter may generate a digital count value based on the charge-current adjustment signal. The digital-to-analog converter (DAC) may generate a DAC control signal based on the digital count value of the counter, the DAC control signal being representative of an amount of charge current to be used to charge a battery.

Address:

9365 Hillery Dr APT 21106, San Diego, CA 92126

Phone:

858 437-2202

VIN:

19UUA66297A024992

Make:

ACURA

Model:

TL

Year:

2007