Lynn F Johnson

Author:

Lynn Eric Johnson

ISBN #:

0877473161

Author:

Lynn Staley Johnson

ISBN #:

0299095401

Author:

Lynn S. Johnson

ISBN #:

0271006994

Author:

Lynn Johnson

ISBN #:

0312143524

Author:

Lynn Johnson

ISBN #:

0688158633

Author:

Lynn Johnson

ISBN #:

0811817474

Author:

Lynn Johnson

ISBN #:

0822935015

Author:

Lynn Johnson

ISBN #:

0792279549

US Patent:

6870333, Mar 22, 2005

Filed:

Dec 13, 2000

Appl. No.:

10/168478

Inventors:

Gerd Griepentrog - Gutenstetten, DE
Lynn Johnson - Verona WI, US
Diethard Runggaldier - Stegaurach, DE

Assignee:

Siemens Aktiengesellschaft - Munich

International Classification:

H02P001/22
H02P001/40
H02P003/20
H02P005/00

US Classification:

318257, 318254, 318268, 318799, 318800

Abstract:

Asynchronous motors are controlled by way of two- or three-phase controllers that include at least two pair of thyristors connected in antiparallel and fired at certain intervals. According to the inventive method, a fundamental wave with the desired frequency is defined for the first phase and in the other phase a respective fundamental wave is defined that has the same frequency as that in the first phase, but phase-shifted by corresponding values. For every phase, firing intervals are marked that have the same polarity as the respective fundamental wave. Those intervals of the potential firing intervals are used for every phase at which there is a potential firing interval in one of the two other phases. These intervals are used as the actual firing intervals.

US Patent:

7940029, May 10, 2011

Filed:

Jul 2, 2008

Appl. No.:

12/166357

Inventors:

Lynn Johnson - Verona WI, US

Assignee:

American Superconductor Corporation - Devens MA

International Classification:

G05F 1/70

US Classification:

323207, 323205, 361 58

Abstract:

A system for providing reactive power compensation to a utility power network includes a switch coupled to the utility power network, and a capacitor coupled with the switch for providing a controlled amount of reactive current based on conditions of the utility power network. The system also includes a switchable power dissipation device coupled in series to the capacitor and configured to provide a preselected amount of impedance to the reactive current for a predetermined duration when a line voltage on the utility power network drops below a threshold.

US Patent:

8629659, Jan 14, 2014

Filed:

Jan 4, 2011

Appl. No.:

12/983957

Inventors:

Lynn Johnson - Verona WI, US

Assignee:

American Superconductor Corporation - Devens MA

International Classification:

G05F 1/70

US Classification:

323210, 323211

Abstract:

A method of controlling a static VAR compensator includes providing a static VAR compensator having a capacitive component and a thyristor for switching the capacitive component into and out of a power distribution network; monitoring an electrical characteristic associated with the capacitive component; and controlling operation of the thyristor at least in part on the basis of the electrical characteristic associated with the capacitive component.

US Patent:

20100265816, Oct 21, 2010

Filed:

Apr 17, 2009

Appl. No.:

12/425736

Inventors:

Lynn Johnson - Verona WI, US

Assignee:

American Superconductor Corporation - Devens MA

International Classification:

H04L 12/26

US Classification:

370217, 370244

Abstract:

A system and method are described for detecting failures of switches in a switching network including a plurality of switches. The sensing circuit includes a plurality of detecting networks, the plurality of detecting networks being fewer than the plurality of switches, each detecting network providing signals indicative of a failure of at least one of the switches.

US Patent:

20110241757, Oct 6, 2011

Filed:

Mar 30, 2010

Appl. No.:

12/749930

Inventors:

Lynn Johnson - Verona WI, US

Assignee:

American Superconductor Corporation - Devens MA

International Classification:

H03K 17/72

US Classification:

327440

Abstract:

A method of controlling a static VAR compensator includes providing a static VAR compensator having a reactive component and a thyristor for switching the reactive component into and out of a power distribution network; monitoring a periodic waveform on the power distribution network and controlling operation of the thyristor on the basis of the harmonic frequency content of the waveform.