1
Hung M Pham, Abtar Singh, Jean Luc M Caillat, Mark Bass: Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor. Copeland Corporation, Harness Dickey & Pierce, April 11, 2000: US06047557 (127 worldwide citation)

A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would ...


2
Hung M Pham, Jean Luc Caillat: Scroll machine with continuous capacity modulation. Copeland Corporation, Harness Dickey & Pierce, July 2, 2002: US06412293 (93 worldwide citation)

An improved continuous capacity modulation system for scroll-type compressors is disclosed in which a valve body of a solenoid valve assembly is secured to the inner wall of the hermetic shell and the actuating coil is mounted on the outer surface thereof. The actuating coil includes a plunger/valve ...


3
Hung M Pham: Compressor diagnostic and protection system. Emerson Climate Technologies, Harness Dickey & Pierce, August 19, 2008: US07412842 (90 worldwide citation)

A system includes a compressor, processing circuitry, a first sensor detecting high-side data indicative of an operating condition of a high-pressure side of the refrigeration circuit, and a second sensor detecting low-side data indicative of an operating condition of a low-pressure side of the refr ...


4
Hung M Pham, Richard P Vogh III, Nagaraj Jayanth: Digital scroll condensing unit controller. Copeland Corporation, Harness Dickey & Pierce, August 5, 2003: US06601397 (71 worldwide citation)

A cooling system controller controls the capacity of a variable capacity compressor based upon the temperature of a housing being cooled, the suction pressure of the compressor or both of these criteria. The cooling system controller is capable of controlling either single-evaporator or multiple-eva ...


5
Hung M Pham, Abtar Singh, Jean Luc M Caillat, Mark Bass: Diagnostic system and method for a cooling system. Copeland Corporation, Harness Dickey & Pierce, January 20, 2004: US06679072 (70 worldwide citation)

A diagnostic system and method for a cooling system includes producing a control signal for adjusting a valve position of a regulator valve as a demand for cooling, as well as providing an ambient temperature measurement, coil inlet temperature measurement, and coil exit temperature measurement. The ...


6
Hung M Pham, Abtar Singh, Jean Luc M Caillat, Mark Bass: Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor. Copeland Corporation, Harness Dickey & Pierce, October 22, 2002: US06467280 (63 worldwide citation)

A diagnostic system includes a controller adapted for coupling to a compressor or electronic stepper regulator valve. The controller produces a variable duty cycle control signal to adjust the capacity of the compressor or valve position of the electronic stepper regulator valve as a function of dem ...


7
Hung M Pham, Abtar Singh, Jean Luc M Caillat, Mark Bass: Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor. Copeland Corporation, Harness Dickey & Pierce, September 17, 2002: US06449972 (61 worldwide citation)

A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would ...


8
Hung M Pham, Wayne R Warner: Refrigeration system including thermoelectric module. Emerson Climate Technologies, Harness Dickey & Pierce, December 25, 2007: US07310953 (58 worldwide citation)

A refrigeration system for multi-temperature and single-temperature applications combines a refrigeration circuit and a single-phase fluid heat-transfer circuit in heat-conducting contact through a thermoelectric device. A vapor compression cycle provides a first stage of cooling and the thermoelect ...


9
Hung M Pham: Compressor configuration system and method. Emerson Climate Technologies, Harness Dickey & Pierce, December 2, 2008: US07458223 (52 worldwide citation)

A system and method including a compressor operable in a refrigeration circuit and including a motor, a current sensor detecting current drawn by the motor and providing a high-side condition signal, a discharge line temperature sensor detecting a discharge line temperature of the compressor and pro ...


10
Hung M Pham: Compressor diagnostic and protection system and method. Emerson Climate Technologies, Harness Dickey & Pierce, February 3, 2009: US07484376 (40 worldwide citation)

A system and method includes a compressor, a motor drivingly connected to the compressor, a current sensor detecting current supplied to the motor, a discharge line temperature sensor detecting discharge line temperature, and processing circuitry receiving current data from the current sensor and di ...