Patents by Inventor Ajit W. Kane
Ajit W. Kane 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).
-
Patent number: 11644226Abstract: A chiller assembly is provided. The chiller assembly includes a compressor (102), a condenser (106), an expansion device and an evaporator (108) connected in a closed refrigerant circuit. The chiller assembly further includes a motor (104) connected to the compressor to power the compressor, and a variable speed drive (110) connected to the motor to power the motor. The variable speed drive is operable to provide a variable voltage to the motor and a variable frequency to power the motor. The variable speed drive includes multiple sensors and an input current estimator that determines an estimated RMS input current based on sensor data received from the sensors. The chiller assembly further includes a control panel to control operation of the variable speed drive.Type: GrantFiled: September 24, 2018Date of Patent: May 9, 2023Assignee: Johnson Controls Tyco IP Holdings LLPInventors: Ajit W. Kane, Scott V. Slothower
-
Patent number: 10859300Abstract: Embodiments of the present disclosure relate to a heating, ventilating, air conditioning, and refrigeration (HVAC&R) system that includes a variable speed drive configured to provide power to a motor that drives a compressor of the HVAC&R system and a silicon carbide transistor of the variable speed drive, where the silicon carbide transistor is configured to adjust a voltage, or a frequency, or both of power flowing through the variable speed drive.Type: GrantFiled: October 5, 2017Date of Patent: December 8, 2020Assignee: Johnson Controls Technology CompanyInventors: Ivan Jadric, Ajit W. Kane
-
Publication number: 20200278141Abstract: A chiller assembly is provided. The chiller assembly includes a compressor (102), a condenser (106), an expansion device and an evaporator (108) connected in a closed refrigerant circuit. The chiller assembly further includes a motor (104) connected to the compressor to power the compressor, and a variable speed drive (110) connected to the motor to power the motor. The variable speed drive is operable to provide a variable voltage to the motor and a variable frequency to power the motor. The variable speed drive includes multiple sensors and an input current estimator that determines an estimated RMS input current based on sensor data received from the sensors. The chiller assembly further includes a control panel to control operation of the variable speed drive.Type: ApplicationFiled: September 24, 2018Publication date: September 3, 2020Applicant: Johnson Controls Technology CompanyInventors: Ajit W. Kane, Scott V. Slothower
-
Publication number: 20200041185Abstract: Embodiments of the present disclosure relate to a heating, ventilating, air conditioning, and refrigeration (HVAC&R) system that includes a variable speed drive configured to provide power to a motor that drives a compressor of the HVAC&R system and a silicon carbide transistor of the variable speed drive, where the silicon carbide transistor is configured to adjust a voltage, or a frequency, or both of power flowing through the variable speed drive.Type: ApplicationFiled: October 5, 2017Publication date: February 6, 2020Inventors: Ivan Jadric, Ajit W. Kane
-
Patent number: 10125780Abstract: A method of monitoring a backup battery for a magnetic bearing centrifugal compressor. The method includes: establishing threshold voltage values applicable to the battery backup battery level; monitoring the actual voltage of the battery backup; comparing the actual voltage of the battery backup to the threshold voltage; initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; or allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.Type: GrantFiled: August 17, 2015Date of Patent: November 13, 2018Assignee: Johnson Controls Technology CompanyInventors: Jeb W. Schreiber, Ajit W. Kane
-
Patent number: 9621101Abstract: The variable speed drive system is arranged to receive input power at fixed input voltage magnitude and frequency and provide power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC source to convert the input voltage to a boosted DC voltage. A DC link connected to the converter filters the DC voltage from the converter stage. An inverter converts the DC link voltage into variable voltage and the variable frequency AC power. An electromagnetic compatibility (EMC) filter includes a series RC circuit from phase-to-ground circuit for each input phase of the converter. The RC circuit includes a resistor connected in series with a capacitor between the converter phase and ground. The EMC filter is connected to the line side of the converter. An inductor is connected between the input source and the EMC filter.Type: GrantFiled: December 8, 2015Date of Patent: April 11, 2017Assignee: Johnson Controls Technology CompanyInventor: Ajit W. Kane
-
Patent number: 9590540Abstract: A system or method controlling a variable speed drive based on PWM techniques, wherein a first PWM method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (THD); and a second PWM method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of VSD within the whole operation range can be achieved.Type: GrantFiled: January 28, 2014Date of Patent: March 7, 2017Assignee: Johnson Controls Technology CompanyInventors: Zhiqiao Wu, Ajit W. Kane, Shreesha Adiga-Manoor
-
Publication number: 20160164448Abstract: The variable speed drive system is arranged to receive input power at fixed input voltage magnitude and frequency and provide power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC source to convert the input voltage to a boosted DC voltage. A DC link connected to the converter filters the DC voltage from the converter stage. An inverter converts the DC link voltage into variable voltage and the variable frequency AC power. An electromagnetic compatibility (EMC) filter includes a series RC circuit from phase-to-ground circuit for each input phase of the converter. The RC circuit includes a resistor connected in series with a capacitor between the converter phase and ground. The EMC filter is connected to the line side of the converter. An inductor is connected between the input source and the EMC filter.Type: ApplicationFiled: December 8, 2015Publication date: June 9, 2016Inventor: Ajit W. KANE
-
Publication number: 20160053765Abstract: A method of monitoring a backup battery for a magnetic bearing centrifugal compressor. The method includes: establishing threshold voltage values applicable to the battery backup battery level; monitoring the actual voltage of the battery backup; comparing the actual voltage of the battery backup to the threshold voltage; initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; or allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.Type: ApplicationFiled: August 17, 2015Publication date: February 25, 2016Inventors: Jeb W. SCHREIBER, Ajit W. KANE
-
Publication number: 20150318803Abstract: A system or method controlling a variable speed drive based on PWM techniques, wherein a first PWM method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (THD); and a second PWM method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of VSD within the whole operation range can be achieved.Type: ApplicationFiled: January 28, 2014Publication date: November 5, 2015Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANYInventors: Zhiqiao WU, Ajit W. KANE, Shreesha ADIGA-MANOOR
-
Patent number: 8174853Abstract: Systems and methods for improved VSDs are provided. One embodiment relates to an apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with VSDs, including conducted EMI/RFI input power mains mitigation. Another embodiment relates to a method to extend the synchronous operation of an Active Converter to the AC mains voltage during complete line dropout. Another embodiment relates to an Active Converter-based Variable Speed Drive system with Improved Full Speed Efficiency.Type: GrantFiled: February 24, 2011Date of Patent: May 8, 2012Assignee: Johnson Controls Technology CompanyInventors: Ajit W. Kane, Ivan Jadric, Shreesha Adiga-Manoor, Michael Todd, Konstantin Borisov
-
Publication number: 20110141774Abstract: Systems and methods for improved VSDs are provided. One embodiment relates to an apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with VSDs, including conducted EMI/RFI input power mains mitigation. Another embodiment relates to a method to extend the synchronous operation of an Active Converter to the AC mains voltage during complete line dropout. Another embodiment relates to an Active Converter-based Variable Speed Drive system with Improved Full Speed Efficiency.Type: ApplicationFiled: February 24, 2011Publication date: June 16, 2011Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANYInventors: Ajit W. KANE, Ivan JADRIC, Shreesha ADIGA-MANOOR, Michael TODD, Konstantin BORISOV