Theodore C Pettyjohn

US Patent:

20130127381, May 23, 2013

Filed:

Nov 16, 2012

Appl. No.:

13/678637

Inventors:

Phase Technologies, LLC - Rapid City SD, US
Theodore Clifton Pettyjohn - Rapid City SD, US
Jack Yongchen Yang - Rapid City SD, US
Peda V. Medagam - Rapid City SD, US

Assignee:

PHASE TECHNOLOGIES, LLC - Rapid City SD

International Classification:

H02P 23/00
H02M 5/458

US Classification:

318376, 363 37

Abstract:

A regenerative variable frequency drive includes an active converter connected to an inverter. The converter has a filter capacitor, an inductor, two half bridges, bus bars that connect to the inverter and bus capacitors. The converter converts single phase AC power to DC power and DC power to single phase AC power, boosts the AC power, reduces input line harmonics, maintains input current in phase with utility voltage in order to achieve near unity power factor, and maintains constant DC voltage between the bus bars.

US Patent:

20170170743, Jun 15, 2017

Filed:

Dec 9, 2016

Appl. No.:

15/373913

Inventors:

Peda V. Medagam - Rapid City SD, US
Theodore Clifton Pettyjohn - Rapid City SD, US
Jack Yang - Rapid City SD, US

Assignee:

Phase Technologies, LLC - Rapid City SD

International Classification:

H02M 5/458

Abstract:

A regenerative variable frequency drive includes an active converter connected to a DC bus that is connected to a first inverter that converts DC power to variable frequency, three phase AC power, and variable frequency, three phase AC power to DC power, and to a second inverter that converts DC power to three phase AC sine wave power. The converter converts single phase AC power to DC power and DC power to single phase AC power, and maintains a selected voltage on the DC bus. The converter has an active rectifier and a controller that drives the rectifier with a pulse width modulation according to a hybrid voltage switching scheme that switches the rectifier according to a unipolar voltage switching scheme through most of each cycle and switches the rectifier according to a bipolar voltage switching scheme around each zero crossing.