Terry Lee 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:

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:

20090251005, Oct 8, 2009

Filed:

Apr 7, 2008

Appl. No.:

12/098638

Inventors:

Terry D. BUSH - Westerville OH, US
Brian P. HEBER - Delaware OH, US
Mohammad Nanda Rahmana MARWALI - Lewis Center OH, US
Peter A. PANFIL - Columbus OH, US

Assignee:

LIEBERT CORPORATION - Columbus OH

International Classification:

H02J 9/00

US Classification:

307 64

Abstract:

A method of increasing the reliability of an uninterruptible power supply (UPS) providing AC power to a load, comprising determining the magnitude and duration of an actual undervoltage event in a power output of the UPS; providing a predetermined undervoltage standard establishing at least a range of undervoltage events of acceptable magnitude and duration for the load; comparing the magnitude and duration of the actual undervoltage event with the predetermined standard; and causing the load to be transferred to an alternate source of AC power when the comparison of the actual undervoltage event with the predetermined standard reveals that the actual undervoltage event is not acceptable.

US Patent:

20170244277, Aug 24, 2017

Filed:

Jan 23, 2017

Appl. No.:

15/412476

Inventors:

- Columbus OH, US
Terry D. BUSH - Westerville OH, US
Xian CHEN - Columbus OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

H02J 9/06

Abstract:

A method reduces inrush currents in a transformer-less rectifier UPS system when an input circuit breaker of the UPS system is closed from an open position. The circuit breaker is coupled between an AC power input and an AC input of a rectifier of the UPS system and a DC output of the rectifier is coupled to a DC bus of the UPS system. Before the circuit breaker is closed, the DC bus is charged to a DC voltage having a level that is equal to a peak AC voltage level of a line-line AC voltage of AC input power to the UPS system. The rectifier is operated as an inverter to provide an AC output voltage at the AC input of the rectifier that is equal to an AC voltage at the AC power input and when it is equal, the circuit breaker is closed.

US Patent:

20160282390, Sep 29, 2016

Filed:

Mar 21, 2016

Appl. No.:

15/075535

Inventors:

- Columbus OH, US
Terry D. BUSH - Westerville OH, US
Charles F. BLAIR - Powell OH, US

International Classification:

G01R 19/06
G01R 19/02

Abstract:

A real current meter reads current from a current probe coupled around power lines of a transformer-based UPS system coupled to a transformer having a high resistance ground with a HRG resistance and determines a real current component of the current read from the current probe.

US Patent:

20150244206, Aug 27, 2015

Filed:

Feb 6, 2015

Appl. No.:

14/615814

Inventors:

- Columbus OH, US
Terry D. BUSH - Westerville OH, US
Brian P. HEBER - Delaware OH, US
Charles F. BLAIR - Powell OH, US

Assignee:

LIEBERT CORPORATION - Columbus OH

International Classification:

H02J 9/00
H02M 7/42

Abstract:

A common mode choke in a 3-wire transformer free UPS system with which different rectifier and bypass power sources are used is eliminated by using different types of PWM control depending on whether the inverter is paralleled with the bypass power source. When the inverter is paralleled with the bypass power source, a type of PWM control is used that does not have common mode voltage injection. When the inverter is not paralleled with the bypass power source, a type of PWM control is used that has common mode voltage injection. In an aspect, the PWM control that does not have common mode voltage injection is sine-triangle PWM and the PWM control that has common mode voltage injection is space-vector PWM.