Terry K Bush

US Patent:

6553778, Apr 29, 2003

Filed:

Jan 16, 2001

Appl. No.:

09/760561

Inventors:

Russ Tipton - Westerville OH
Terry Bush - Westerville OH
Mike Graham - Delaware OH
Jack Saunders - Grove City OH

Assignee:

Emerson Electric Co. - St. Louis MO

International Classification:

F25B 4100

US Classification:

621961, 62524, 62525

Abstract:

A multi-stage cooling system is disclosed. The multi-stage cooling system is capable of providing a plurality of cooling capacities. The cooling system has a plurality of independently operable compressors. A control system operates the compressors to provide a cooling capacity corresponding to the heat load of a space to be cooled. A condenser structure of the cooling system has a plurality of individual condenser coils. Each condenser coil has an independent refrigerant path receiving compressed refrigerant from one of the compressors. An evaporator structure of the cooling system has a plurality of individual evaporator coils. Each evaporator coil has an independent refrigerant path receiving condensed refrigerant from a corresponding condenser coil via an expansion mechanism and returning refrigerant to an input of a corresponding compressor.

US Patent:

6917124, Jul 12, 2005

Filed:

Oct 26, 2001

Appl. No.:

10/007273

Inventors:

Brian Paul Heber - Delaware OH, US
Kevin Kim Eschhofen - Lewis Center OH, US
Ramesh Subramanian - Irvine CA, US
Nelson John Norris - Marengo OH, US
Ronald Richard Rautenstrauch - Huntington Beach CA, US
Jon Ross Funk - Lexington OH, US
Kevin Jay Bell - Centerburg OH, US
Suratkal Padmanabha Shenoy - Mission Viejo CA, US
Terry Dwane Bush - Westerville OH, US
Farzin Kafaipour - Rancho Santa Margarita CA, US
Mohammad Nanda Rahmana Marwali - Lewis Center OH, US
Andy Margraff - New Albany OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H02J007/00

US Classification:

307 66, 320137

Abstract:

An uninterruptible power supply is disclosed that includes a digital controller comprising a plurality of microprocessors. These microprocessors are programmed and arranged to provide various control features heretofore unavailable using analog controllers of the prior art.

US Patent:

7352082, Apr 1, 2008

Filed:

Nov 10, 2004

Appl. No.:

10/904441

Inventors:

Mohammad N Marwali - Lewis Center OH, US
Terry D Bush - Westerville OH, US
Brian Heber - Delaware OH, US
Jeffery Powell - Lewis Center OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H02J 1/10
H02J 3/38
H02J 7/34

US Classification:

307 52

Abstract:

This disclosure is concerned with devices and methods for voltage source transfer switching that reduces or eliminates transformer saturation due to DC flux built up during a transfer event. First and second voltage sources (primary and alternate) are connectable to a load via corresponding switches. A transformer is connected downstream of the switches. A controller operates the switches according to various transfer methods wherein a switching time is determined to minimize downstream saturation current.

US Patent:

7459804, Dec 2, 2008

Filed:

Nov 10, 2004

Appl. No.:

10/904443

Inventors:

Mohammad N Marwali - Lewis Center OH, US
Terry D Bush - Westerville OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H02J 1/00

US Classification:

307 87, 307127

Abstract:

Devices and methods for improved voltage source transfer switching. First and second voltage sources (primary and alternate) are connectable to a load via corresponding first and second switches, which may comprise SCRs. A controller operates the switches according to various transfer methods. In some transfer methods, the timing of the switching operation is critical. For example, switching times may be optimized to reduce or prevent transformer saturation due to the dc flux built up during the transfer event. The controller force commutates off the primary source switch by turning on the appropriate alternate source switch for a brief period of time. In this case, the alternate source switches are “pulsed” (rather than being turned on continuously), so that the switches will naturally commutate off at the next current zero cross. Subsequently, the volt-second balancing control logic will permanently turn on these switches at the appropriate time.

US Patent:

7566988, Jul 28, 2009

Filed:

Jun 12, 2006

Appl. No.:

11/423497

Inventors:

Brian Heber - Delaware OH, US
Terry D Bush - Westerville OH, US
Mohammad Nanda Marwali - Lewis Center OH, US
Paul Taylor - Delaware OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H02J 1/10
H02J 3/38
H02J 9/00

US Classification:

307 44, 307 64

Abstract:

An uninterruptible power supply (UPS) system includes a first UPS module that has a first power source, a second power source and a controller operable to selectively connect the first or second power source to a load. A second UPS module is connected in parallel with the first UPS module. The second UPS module also includes a first power source, a second power source and a controller operable to selectively connect the first or second power source to a load. The controller of the first UPS module gradually transfers power from the first power source of the first UPS module to the first power source of the second UPS module to detect the presence of the first power source of the second UPS module.

US Patent:

7668624, Feb 23, 2010

Filed:

Jun 29, 2006

Appl. No.:

11/427701

Inventors:

Brian P Heber - Delaware OH, US
Kevin Eschhofen - Lewis Center OH, US
Mohammad Nanda Marwali - Lewis Center OH, US
Terry D Bush - Westerville OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

G05D 11/00

US Classification:

700286, 700295, 700 79, 700 82, 307 65

Abstract:

An uninterruptible power supply (UPS) includes a plurality of UPS modules. Each of the UPS modules has a battery that provides power to a protected load in the event of a utility power failure. A plurality of controllers control how much power each of the batteries deliver to the protected load, and a communication bus allows the controllers to exchange information about the battery voltages. One of the controllers calculates the average battery voltage of the plurality of batteries and adjusts the amount of energy provided by an individual battery such that the battery voltage is about equal to the average battery voltage.

US Patent:

7987023, Jul 26, 2011

Filed:

Feb 18, 2009

Appl. No.:

12/388224

Inventors:

Terry D. Bush - Westerville OH, US
John E. Saunders - Grove City OH, US
John F. Christensen - Lewis Center OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

G06F 19/00
G05B 21/00

US Classification:

700277, 700276

Abstract:

An air conditioning (A/C) system that may have a plurality of air conditioning units disposed in different zones of an area that each operate to cool the different zones, a humidity sensor for sensing the humidity in the area, and a controller. The controller may be adapted to analyze a sensible heat load being experienced by each of the air conditioning units and to control a latent heat removal being performed by each air conditioning unit such that a percentage of latent heat removal performed by each air conditioning unit does not exceed a percentage of sensible heat removal being performed by each air conditioning unit.

US Patent:

8271146, Sep 18, 2012

Filed:

Dec 3, 2009

Appl. No.:

12/630107

Inventors:

Brian P Heber - Delaware OH, US
Kevin Eschhofen - Lewis Center OH, US
Mohammad Nanda Marwali - Wilsonville OR, US
Terry D Bush - Westerville OH, US

Assignee:

Liebert Corporation - Columbus MO

International Classification:

G05D 11/00

US Classification:

700292, 700286, 700295, 700298

Abstract:

An uninterruptible power supply (UPS) includes a plurality of UPS modules. Each of the UPS modules has a battery that provides power to a protected load in the event of a utility power failure. A plurality of controllers control how much power each of the batteries deliver to the protected load, and a communication bus allows the controllers to exchange information about the battery voltages. One of the controllers calculates the average battery voltage of the plurality of batteries and adjusts the amount of energy provided by an individual battery such that the battery voltage is about equal to the average battery voltage.