Patents by Inventor Panayu R. Srichai

Panayu R. Srichai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Temperature control through pulse width modulation
    Patent number: 8082747
    Abstract: A refrigerant compressor assembly for a refrigeration circuit controls the temperature within a temperature controlled space. The refrigerant compressor assembly includes a first unloading valve, a first valve actuator, and a first valve control system that adjusts the first valve actuator via a pulse-width-modulated signal, a second unloading valve, a second valve actuator, and a second valve control system that adjusts the second valve actuator via a pulse-width-modulated signal. The refrigerant compressor assembly also includes a third unloading valve. The first valve actuator is coupled to the first and third unloading valves and controlled by the first valve control system. The unloading valves selectively allow or resist fluid flow from higher to lower pressure areas within the refrigerant compressor assembly.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: December 27, 2011
    Assignee: Thermo King Corporation
    Inventors: Lars I. Sjoholm, Panayu R. Srichai
  • TEMPERATURE CONTROL THROUGH PULSE WIDTH MODULATION
    Publication number: 20100139301
    Abstract: A refrigerant compressor assembly for a refrigeration circuit controls the temperature within a temperature controlled space. The refrigerant compressor assembly includes a first unloading valve, a first valve actuator, and a first valve control system that adjusts the first valve actuator via a pulse-width-modulated signal, a second unloading valve, a second valve actuator, and a second valve control system that adjusts the second valve actuator via a pulse-width-modulated signal. The refrigerant compressor assembly also includes a third unloading valve. The first valve actuator is coupled to the first and third unloading valves and controlled by the first valve control system. The unloading valves selectively allow or resist fluid flow from higher to lower pressure areas within the refrigerant compressor assembly.
    Type: Application
    Filed: December 9, 2008
    Publication date: June 10, 2010
    Applicant: THERMO KING CORPORATION
    Inventors: Lars I. Sjoholm, Panayu R. Srichai