Miguel Angel Chavez

US Patent:

6629247, Sep 30, 2003

Filed:

Mar 28, 2000

Appl. No.:

09/537974

Inventors:

Richard Hall - Wake Forest NC
Miguel E. Chavez - Raleigh NC

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

G06F 126

US Classification:

713300, 307 66, 37039542

Abstract:

Modules included in a UPS system can communicate over a Controller Area Network using messages having separate fields within an arbitration field. In particular, the separate fields can be separate priority fields, separate module identifier fields, and separate source and destination routing fields. The separate priority field can allow identical message types having different priority to be transmitted within the UPS system. For example, in a UPS system according to the invention, a rectifier off command can have greater priority than a rectifier reset command. The separate module identifier fields can uniquely identify the location of a module in the UPS system which transmitted the message. For example, the module identifier can be provided by customized wiring in a wiring harness connected to a respective communications interface circuit. The separate destination routing fields can be used to transmit messages to and from bridges in the UPS system.

US Patent:

7050312, May 23, 2006

Filed:

Mar 9, 2004

Appl. No.:

10/796647

Inventors:

John G. Tracy - Raleigh NC, US
Miguel E. Chavez - Raleigh NC, US
Rune Lennart Jonsson - Raleigh NC, US

Assignee:

Eaton Power Quality Corporation - Cleveland OH

International Classification:

H02M 5/458

US Classification:

363 37, 363 34, 307 66

Abstract:

An uninterruptible power supply apparatus includes a first bidirectional power converter circuit having first and second ports and a second bidirectional power converter circuit having first and second ports. The apparatus further includes a DC link that couples the second port of the first bidirectional power converter circuit to the first port of the second bidirectional power converter circuit. A first load port is coupled to the second port of the second bidirectional power converter circuit and a second load port is coupled to the first port of the first bidirectional power converter circuit. The apparatus further includes a control circuit that is configured to control the first and second bidirectional power converter circuits such that each of the first and second bidirectional power converter circuits can generate and/or condition AC power at each of the first and second load ports.

US Patent:

7948778, May 24, 2011

Filed:

Jun 10, 2008

Appl. No.:

12/136160

Inventors:

Hans-Erik Pfitzer - Wake Forest NC, US
Rune Lennart Jonsson - Raleigh NC, US
John G. Tracy - Raleigh NC, US
Miguel E. Chavez - Raleigh NC, US
Frederick Tassitino, Jr. - Wake Forest NC, US
Jason S. Anderson - Raleigh NC, US

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

H02M 5/40
H02M 7/10

US Classification:

363 34, 363 50

Abstract:

A power supply apparatus includes first and second parallel-connected uninterruptible power supplies (UPSs), each including an AC/DC converter circuit and a DC/AC converter circuit having an input coupled to an output of the AC/DC converter circuit by a DC link, inputs of the AC/DC converter circuits of the first and second UPSs connected in common to an AC source and outputs of the DC/AC converter circuits of the first and second UPSs connected in common to a load. The first and second UPSs are configured to support a test mode wherein the first UPS is test loaded by transferring power from the output of the DC/AC converter circuit of the first UPS to the output of the DC/AC converter circuit of the second UPS. The first UPS may be configured to provide power to the load concurrent with test loading by the second UPS.

US Patent:

20050265059, Dec 1, 2005

Filed:

May 27, 2004

Appl. No.:

10/855850

Inventors:

John Tracy - Raleigh NC, US
Miguel Chavez - Raleigh NC, US

International Classification:

H02M007/5387

US Classification:

363132000

Abstract:

A power conversion module includes a frame, first external connection terminals supported by the frame, and at least four half-bridge circuits supported by the frame and electrically coupled between selected pairs of the first external connection terminals. The module further includes respective second external connection terminals supported by the frame and electrically coupled to respective center nodes of respective ones of the at least four half-bridge circuits. The module may also include at least four inductors supported by the frame, respective ones of the at least four inductors coupling respective ones of the center nodes of the at least four half-bridge circuits to respective ones of the second external connection terminals. The module may further include at least one storage capacitor supported by the frame and electrically coupled between a pair of the first external connection terminals. The module may be used, for example, to provide rectifier and inverter functions in an uninterruptible power supply (UPS).

US Patent:

20050286274, Dec 29, 2005

Filed:

Jun 29, 2004

Appl. No.:

10/879441

Inventors:

Hans-Erik Pfitzer - Wake Forest NC, US
Rune Jonsson - Raleigh NC, US
John Tracy - Raleigh NC, US
Miguel Chavez - Raleigh NC, US
Frederick Tassitino - Wake Forest NC, US
Jason Anderson - Raleigh NC, US

International Classification:

H02M005/45

US Classification:

363037000

Abstract:

A power supply apparatus, such as an on-line UPS, includes an AC/DC converter circuit having an input configured to be coupled to an AC source, a DC/AC converter circuit having an input coupled to an output of the AC/DC converter circuit by a DC link, and a bypass circuit operative to couple and decouple the output of the DC/AC converter circuit to and from the input of the AC/DC converter circuit. Power is transferred from the output of DC/AC converter circuit via the bypass circuit to conduct a test of the apparatus, such as a factory or field load test. For example, power may be circulated around a loop including the AC/DC converter circuit, the DC/AC converter circuit and the bypass circuit to conduct the test in order to test these components under load. A status of such components may be determined responsive to the test. In further embodiments, such components may be calibrated responsive to the test.

US Patent:

62017209, Mar 13, 2001

Filed:

Feb 18, 2000

Appl. No.:

9/507021

Inventors:

John G. Tracy - Raleigh NC
Edward Akbari - Etobicoke, CA
Miguel E. Chavez - Raleigh NC
Frederick Tassitino - Wake Forest NC

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02M 744

US Classification:

363 95

Abstract:

Uninterruptible power supplies (UPSs), power conversion apparatus and power conversion methods are provided which may improve phase regulation of polyphase AC voltages in the presence of load imbalances. According to one embodiment, a UPS includes a DC voltage generating circuit that produces a DC voltage. A space vector domain controlled inverter couples the DC voltage generating circuit to an AC load, and produces a polyphase AC output voltage at the load by sensing a plurality of voltages at the load, transforming the plurality of sensed voltages according to a space vector (d-q) transformation to produce an output space vector, generating an error space vector from the output space vector and a reference space vector, and selectively coupling the DC voltage generating circuit to the load responsive to the error space vector. In this manner, a voltage control loop is closed in the d-q domain, which may improve per-phase regulation of the polyphase AC output. Preferably, compensation is applied to the error space vector to produce a control space vector that compensates for poles or other transfer characteristics of the forward path of the voltage control loop.

US Patent:

63077639, Oct 23, 2001

Filed:

Dec 20, 1999

Appl. No.:

9/467655

Inventors:

Miguel E. Chavez - Raleigh NC
Fred Tassitino - Wake Forest NC
John G. Tracy - Raleigh NC

Assignee:

Powerware Corporation - Raleigh NC

International Classification:

H02M 700

US Classification:

363 70

Abstract:

Twelve-pulse rectifiers include a first controller that controls a first six-pulse rectifier, a second controller that controls a second six-pulse rectifier and a data network that couples the first controller and the second controller to exchange data therebetween. The first and second controllers preferably have a common architecture and preferably operate independently. Each controller preferably controls its associated six-pulse rectifier as a function of the current and/or voltage output of the associated six-pulse rectifier, preferably using conventional feedback control techniques. Moreover, the first controller also preferably controls the first six-pulse rectifier as a function of a second current at the second six-pulse rectifier output, and the second controller preferably controls the second six-pulse rectifier as a function of a first current at the first six-pulse rectifier output. Thus, each six-pulse rectifier may be controlled as a function of the current at the other six-pulse rectifier output. The first controller preferably receives second data representing the second current at the second six-pulse rectifier output via the data network, and the second controller preferably receives first data representing a first current at the first six-pulse rectifier output via the data network.

US Patent:

20200323109, Oct 8, 2020

Filed:

Mar 30, 2020

Appl. No.:

16/834120

Inventors:

- Dublin, IE
Miguel E. Chavez - Raleigh NC, US

International Classification:

H05K 7/20

Abstract:

A system includes a vessel, a cooling fluid in the vessel, and at least one power magnetics assembly in the vessel and immersed in the cooling fluid. The system further includes at least one heat sink having a surface in contact with the cooling fluid in the vessel and at least one power semiconductor device mounted on the at least one heat sink. The cooling fluid may be electrically insulating and the vessel may be sealed.