Joseph R Wade

US Patent:

6396170, May 28, 2002

Filed:

Mar 29, 2000

Appl. No.:

09/537421

Inventors:

Derek Laufenberg - Wauwatosa WI
Peter Jungwirth - Wisconsin Rapids WI
Joseph R. Wade - Mindoro WI

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02J 104

US Classification:

307 64, 307 43, 307 52, 307 82, 363 71, 363142, 363 65

Abstract:

Presented is a modular uninterruptible power supply system utilizing common power modules, and providing redundant coordinated control thereof. The system and method of the instant invention provides identical control logic within each of the individual power modules, thus dispensing with the requirement for a separate control module to control and coordinate the operating modes and parameters of the UPS system. A system is presented whereby a virtual master is established through an arbitration scheme at initialization of the UPS system. The master then assigns a virtual vice master to provide the redundant back up control should the virtual master no longer be able to perform its functions. Nearly simultaneous control of operational mode and state change functions is accomplished through a coordinated communications system including a high-speed communications bus and digital control logic lines. Also provided is a mechanism for removal of the virtual master from its duties upon the detection of a problem that is not detected by the virtual master itself.

US Patent:

6515883, Feb 4, 2003

Filed:

Mar 28, 2001

Appl. No.:

09/820261

Inventors:

Joseph R. Wade - Mindoro WI

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02M 700

US Classification:

363123, 323222

Abstract:

Presented is a single-stage power converter topology allowing for power factor correction during operation. The topology utilizes an integration of uk converter and single-ended primary inductance converter (SEPIC) topologies to provide AC-to-AC, AC-to-DC, DC-to-AC, and AC/DC-to-AC operation. Shared use of the uk converters output inductor by the SEPIC-type circuit elements provides continuous output current, typically unknown to a SEPIC converter. Application of the single-stage power converter topologies may be had in a line conditioner circuit, a battery charger circuit, and as an uninterruptible power supply (UPS).

US Patent:

6605879, Aug 12, 2003

Filed:

Apr 19, 2001

Appl. No.:

09/838369

Inventors:

Joseph R. Wade - Mindoro WI
Glenn A. Koosmann - Port Edwards WI

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02J 700

US Classification:

307 66, 363 37

Abstract:

A charging control circuit for severe battery conditions and an uninterruptible power supply (UPS) system including same are presented. The charging control circuit utilizes both hardware and microprocessor control to allow the UPS to start with depleted or no batteries installed. Initially, the hardware control loops regulate DC bus voltage generation to charge the batteries to a safe level to allow the UPS housekeeping circuitry to wake up and assume control of the UPS operation. Once the microprocessor has awoken, it assumes control of the DC bus and charging of the batteries. If no batteries are installed, the hardware control loop utilizes a fast responding voltage mode control to regulate the DC bus, while a microprocessor-based current mode control is used when batteries are installed. Hardware over voltage control and microprocessor shut off control is also provided.

US Patent:

6724596, Apr 20, 2004

Filed:

Jan 26, 2001

Appl. No.:

09/770480

Inventors:

Joseph R. Wade - Mindoro WI

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02H 300

US Classification:

361 931, 361 18, 361100, 361115

Abstract:

Presented is a control system and method for minimizing the adverse affects resulting from conventional hysteretic current control of power inverters, and an uninterruptible power supply using same. The system of the present invention uses control circuitry for monitoring and classifying the PWM switching events commanded by conventional hysteretic current control and adjusting the dead time delay injected based on these PWM events. Preferably, the control circuitry uses a minimum delay dead time component to preclude the possibility of a shoot through condition from occurring, and also includes a frequency control component of the total dead time delay. In one embodiment this frequency control component may vary in proportion to the switching frequency commanded by the hysteretic current control loop. In an alternate embodiment, the PWM switching events are classified into differing modes of operation, during which a particular fixed frequency control dead time delay is selected. The control of the present invention may also use a maximum difference current control limit for the dead time delay to preclude excessive output current swings beyond the typical hysteretic current control limits.

US Patent:

6292379, Sep 18, 2001

Filed:

Mar 29, 2000

Appl. No.:

9/538051

Inventors:

Craig Edevold - Tomah WI
Cary Winch - Necedah WI
Donald K. Zahrte - Necedah WI
Joseph R. Wade - Mindoro WI
Peter Jungwirth - Wisconsin Rapids WI
Derek Laufenberg - Wauwatosa WI

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02M 700

US Classification:

363 71

Abstract:

A modular uninterruptible power supply is presented having multiple power modules installed therein. Each of the individual power modules contains an internal bypass circuit sized for its particular power module. Preferably internal bypass circuitry is sized to carry two per unit load. The system and method of the invention also includes internal control circuitry for each of the modular power modules that control transitions between the inverter and bypass modes of operation. This transition control is coordinated with the other controllers for the other modular power modules installed in the uninterruptible power supply. Both the high speed communication bus and a high level interrupt line are utilized to minimize the transfer break time between different modes of operation while ensuring that the inverter is never paralleled with the utility line voltage. To further minimize this transfer time, a solid state switching circuit is utilized to provide the initialization between operational modes. To maximize the efficiency during the bypass mode of operation, and electromechanical relay is utilized in coordinated operation with the solid state switching device to provide long-term power requirements during the bypass mode.

US Patent:

56254016, Apr 29, 1997

Filed:

Sep 23, 1993

Appl. No.:

8/126284

Inventors:

Christopher A. Wiklof - Everett WA
Pixie A. Austin - Everett WA
Joseph R. Wade - Monroe WA
Melanie Z. Pate - Kirkland WA

Assignee:

Intermec Corporation - Everett WA

International Classification:

B41J 2345

US Classification:

347208

Abstract:

A thermal printhead formed on a substrate. The plurality of thermal print elements in the thermal printhead are formed in a linear array. Each of the plurality of thermal print elements is respectively connected to a plurality of common electrode traces and a plurality of ground electrode traces. The common electrode traces are switchably connected to a single common electrode and the ground electrode traces are connected to a single ground electrode. The common electrode is held at a common voltage and the ground electrode is held at a ground voltage. The electrical circuit includes at least one common remote sense electrode connected to the single common electrode and, optionally, at least one ground remote sense electrode connected to the single ground electrode.

US Patent:

60929405, Jul 25, 2000

Filed:

Jun 19, 1998

Appl. No.:

9/100259

Inventors:

Christopher A. Wiklof - Everett WA
Joseph R. Wade - Monroe WA

Assignee:

Intermec IP Corporation - Beverly Hills CA

International Classification:

B41J 336

US Classification:

400 88

Abstract:

A printer for printing on a manually moved print medium. The printer may use thermal or inkjet printing and has user feedback and input. A roller-type position detector enables the printer to be used without a mechanical paper drive mechanism. The printer monitors the print medium as the print medium is propelled through the printer to identify when particular printing fields are aligned to the printhead. The printer then activates the printhead to print image portions in the printing fields. An alternative embodiment of the printer uses a flexible mounting of the printhead. In this embodiment, the paper roll diameter is determined in conjunction with monitoring the rotation of the paper roll to determine the position of the paper without requiring a roller-type position detector.

US Patent:

57149950, Feb 3, 1998

Filed:

Sep 19, 1996

Appl. No.:

8/715993

Inventors:

Christopher A. Wiklof - Everett WA
Pixie A. Austin - Everett WA
Joseph R. Wade - Monroe WA
Melanie Zerbe Pate - Kirkland WA

Assignee:

Intermec Corporation - Everett WA

International Classification:

B41J 2335
B41J 2345

US Classification:

347208

Abstract:

A thermal printhead formed on a substrate. The plurality of thermal print elements in the thermal printhead are formed in a linear array. Each of the plurality of thermal print elements is respectively connected to a plurality of common electrode traces and a plurality of ground electrode traces. The common electrode traces are switchably connected to a single common electrode and the ground electrode traces are connected to a single ground electrode. The common electrode is held at a common voltage and the ground electrode is held at a ground voltage. The electrical circuit includes at least one common remote sense electrode connected to the single common electrode and, optionally, at least one ground remote sense electrode connected to the single ground electrode.