Jeffrey S Rotter

US Patent:

7565560, Jul 21, 2009

Filed:

Oct 31, 2006

Appl. No.:

11/554634

Inventors:

Douglas Michael Boecker - Rochester MN, US
Patrick Kevin Egan - Rochester MN, US
Todd Jon Rosedahl - Zumbrota MN, US
Jeffrey Scot Rotter - Rochester MN, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1/26

US Classification:

713320, 713300, 713310, 713321, 713322, 713323, 713324, 713330, 713340

Abstract:

Combinations of clock frequencies, voltages, and currents at which a processor operates normally are determined. These combinations are stored to a component on which the processor is installed. Voltage identifiers are stored to a computer system in which the component is installed. The voltage identifiers are associated with combinations of the voltages and currents. A type of the computer system is also stored to the component. A first clock frequency at which the processor operates is determined that is assigned to the type of the computer system. A first voltage and a first current are selected that are assigned to the first clock frequency. A first voltage identifier is found that is assigned to the combination of the first voltage and first current, and the first voltage identifier is sent to a voltage regulator, which supplies voltage to the processor.

US Patent:

56170076, Apr 1, 1997

Filed:

Aug 17, 1994

Appl. No.:

8/291990

Inventors:

Steven D. Keidl - Rochester MN
Jeffrey S. Rotter - Rochester MN
Steven W. Steele - Rochester MN

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H02J 700
H01M 1044

US Classification:

320 22

Abstract:

A battery charging aparatus and method are provided for charging a battery using current control with a switching power supply charging circuit coupled to the battery. During a first charging phase, a predetermined constant charging current is applied to the battery. The battery voltage is monitored and a second charging phase is started when the battery voltage reaches a predetermined threshold voltage. During a second charging phase, a sequence of stepwise decreasing-amplitude current pulses are applied to the battery. The envelope for the decreasing current pulses is exponential which is characteristic of the current for voltage controlled charging methods. The battery voltage is maintained at a temperature compensated target with a 1% tolerance. The charging current is compared to a predetermined minimum amplitude value and a third charging phase is started when the sequential charging current pulse equals the predetermined minimum amplitude value. During a third charging phase, predetermined charging current pulses having the predetermined minimum amplitude value are applied to the battery.