Patents by Inventor Shreesha Adiga Manoor
Shreesha Adiga Manoor 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).
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Publication number: 20200067309Abstract: In prior art grid systems, power-line control is done by substation based large systems that use high-voltage (HV) circuits to get injectable impedance waveforms that can create oscillations on the HV power lines. Intelligent impedance injection modules (IIMs) are currently being proposed for interactive power line control and line balancing. These IIMs distributed over the high-voltage lines or installed on mobile platforms and connected to the HV power lines locally generate and inject waveforms in an intelligent fashion to provide interactive response capability to commands from utility for power line control.Type: ApplicationFiled: April 29, 2019Publication date: February 27, 2020Inventors: Antonio Ginart, Michael T. Garrison Stuber, Haroon Inam, Shreesha Adiga Manoor
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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
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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
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Patent number: 9024559Abstract: A converter module for a variable speed drive having a semiconductor device for precharge is described. The precharge circuit includes switching modules, one switching module with a first semiconductor switch connected in parallel or series with a second semiconductor switch. The second semiconductor switch is switched on and off during the precharge operation in order to limit the inrush current into the DC Link. After the precharge operation, the second semiconductor switch is turned on all the time and acts like a diode. The second semiconductor device may have a lower maximum current rating than the main semi-conductor devices. The lower current rated semiconductor device experience the same short circuit current as the higher current rated semiconductor device. The lower current rated semiconductor device can be supplied with a larger gate to emitter voltage than the higher current rated semiconductor device to equalize current between semiconductor devices.Type: GrantFiled: May 4, 2010Date of Patent: May 5, 2015Assignee: Johnson Controls Technology CompanyInventors: Shreesha Adiga-Manoor, Michael S. Todd, Ivan Jadric
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Patent number: 8735955Abstract: A grounding system for a semiconductor module of a variable speed drive includes a first conductive layer, a second conductive layer; a substrate disposed between the first conductive layer and the second conductive layer; and a base attached to the second conductive layer, the base being connected to earth ground via a grounding harness. The first conductive layer is in electrical contact with the semiconductor module and the substrate, and electrically insulated from the second conductive layer by the substrate. The second conductive layer is in electrical contact with the substrate and disposed between the substrate and the base in electrical communication with an earth ground. The first conductive layer, the substrate and the second conductive layer form a capacitance path between the semiconductor module and the base as well as electrical conductors and the base for reduction circulating currents within the semiconductor module.Type: GrantFiled: July 8, 2009Date of Patent: May 27, 2014Assignee: Johnson Controls Technology CompanyInventors: Konstantin Borisov, Michael S. Todd, Shreesha Adiga-Manoor, Ivan Jadric
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Patent number: 8624213Abstract: An optocoupler circuit includes a switch connected in parallel with a photo LED, the photo LED having an anode and a cathode. The anode is connected to a power supply via a decoupling capacitor. The optocoupler circuit is arranged so that the switch turns on the photo LED when in the open position. When closed, the switch directs current flow through a series resistor to ground and shunts current flow away from the photo LED to turn off the photo LED. A second capacitor is connected to the cathode of the photo LED. The second capacitor is wired in series with a second switch and a current limiting resistor connected to ground. The first switch and second switch operate in complementary states to prevent the cathode connected capacitor from discharging. The disclosed optocoupler circuit provides the ability to function at increased levels of common mode voltage transients.Type: GrantFiled: January 12, 2011Date of Patent: January 7, 2014Assignee: Johnson Controls Technology CompanyInventors: Shreesha Adiga-Manoor, Harold R. Schnetzka
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Publication number: 20130026958Abstract: A converter module for a variable speed drive having a semiconductor device for precharge is described. The precharge circuit includes switching modules, one switching module with a first semiconductor switch connected in parallel or series with a second semiconductor switch. The second semiconductor switch is switched on and off during the precharge operation in order to limit the inrush current into the DC Link. After the precharge operation, the second semiconductor switch is turned on all the time and acts like a diode. The second semiconductor device may have a lower maximum current rating than the main semi-conductor devices. The lower current rated semiconductor device experience the same short circuit current as the higher current rated semiconductor device. The lower current rated semiconductor device can be supplied with a larger gate to emitter voltage than the higher current rated semiconductor device to equalize current between semiconductor devices.Type: ApplicationFiled: May 4, 2010Publication date: January 31, 2013Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANYInventors: Shreesha Adiga-Manoor, Michael S. Todd, Ivan Jadric
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Patent number: 8353174Abstract: A chiller system is provided with a compressor, a condenser, and an evaporator connected in a closed refrigerant loop. A motor is connected to the compressor to power the compressor. A variable speed drive is connected to the motor. The variable speed drive is arranged to receive an input AC power at a fixed input AC voltage and a fixed input frequency and provide an output power at a variable voltage and variable frequency to the motor. The variable voltage has a maximum voltage greater in magnitude than the fixed input AC voltage and the variable frequency has a maximum frequency greater than the fixed input frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage, the converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link is arranged to filter and store the DC voltage from the converter. An inverter is connected to the DC link.Type: GrantFiled: October 2, 2009Date of Patent: January 15, 2013Assignee: Johnson Controls Technology CompanyInventors: Ivan Jadric, Zhiqiao Wu, Michael S. Todd, Justin Drew Warner, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
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Patent number: 8336323Abstract: A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive receives an input AC power at a fixed input AC voltage and a fixed input frequency, and provides an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter and configured to filter and store the DC voltage from the converter. An inverter is connected to the DC link. A motor is connectable to the compressor for powering the compressor. A controller is arranged to control switching in the converter and the inverter. The controller is arranged to apply randomized pulse width modulation to vary the switching frequency of transistors in the converter and the inverter at each switching cycle. The motor may be a permanent magnet synchronous motor.Type: GrantFiled: October 2, 2009Date of Patent: December 25, 2012Assignee: Johnson Controls Technology CompanyInventors: Konstantin Borisov, Zhiqiao Wu, Michael S. Todd, Justin Drew Warner, Shreesha Adiga Manoor, Ivan Jadric, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
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Publication number: 20120298890Abstract: An optocoupler circuit includes a switch connected in parallel with a photo LED, the photo LED having an anode and a cathode. The anode is connected to a power supply via a decoupling capacitor. The optocoupler circuit is arranged so that the switch turns on the photo LED when in the open position. When closed, the switch directs current flow through a series resistor to ground and shunts current flow away from the photo LED to turn off the photo LED. A second capacitor is connected to the cathode of the photo LED. The second capacitor is wired in series with a second switch and a current limiting resistor connected to ground. The first switch and second switch operate in complementary states to prevent the cathode connected capacitor from discharging. The disclosed optocoupler circuit provides the ability to function at increased levels of common mode voltage transients.Type: ApplicationFiled: January 12, 2011Publication date: November 29, 2012Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANYInventors: Shreesha Adiga-Manoor, Harold R. Schnetzka
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Patent number: 8286439Abstract: A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC power at a fixed AC input voltage and fixed input frequency and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link is arranged to filter and store the DC voltage from the converter. A first inverter and a second inverter are each connected to the DC link. A motor includes stator windings connected between the first inverter and the second inverter to power the motor by the output AC power from the first inverter and the second inverter. The motor is connectable to a compressor of the chiller system to power the compressor. The motor may be a permanent magnet synchronous motor.Type: GrantFiled: October 2, 2009Date of Patent: October 16, 2012Assignee: Johnson Control Technology CompanyInventors: Zhiqiao Wu, Ivan Jadric, Michael S. Todd, Justin Drew Warner, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
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Patent number: 8258664Abstract: A hybrid motor for powering a compressor of a chiller system includes a first rotor portion and a first stator portion configured as a permanent magnet motor and a second rotor portion and a second stator portion configured as a reluctance motor. The second rotor portion includes a reluctance-type rotor, and the second stator portion includes electromagnetic windings capable of inducing a rotary magnetic field. The first rotor portion and the second rotor portion are attached to a common drive shaft. The reluctance motor is arranged to generate start-up torque and initiate rotation of the drive shaft until the drive shaft achieves a predetermined rotational speed. The permanent magnet motor is arranged to power the drive shaft between the predetermined rotational speed and a maximum rotational speed.Type: GrantFiled: October 2, 2009Date of Patent: September 4, 2012Assignee: Johnson Controls Technology CompanyInventors: Justin D. Warner, Ivan Jadric, Michael S. Todd, Zhiqiao Wu, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
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Patent number: 8193756Abstract: A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link filters and stores the DC voltage from the converter. An inverter is connected to the DC link. A motor connectable to the compressor for powering the compressor. An active filter connected in parallel with the motor. The active filter is arranged to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive. The high frequency currents generated by active filter substantially cancel out high frequency currents flowing into the motor.Type: GrantFiled: October 2, 2009Date of Patent: June 5, 2012Assignee: Johnson Controls Technology CompanyInventors: Ivan Jadric, Zhiqiao Wu, Michael S. Todd, Justin Drew Warner, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
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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
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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
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Patent number: 7957166Abstract: Systems and methods for improved Variable Speed Drives are provided. One embodiment relates to apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with Variable Speed Drives, 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. Another embodiment relates to a liquid- or refrigerant-cooled inductor. The liquid- or refrigerant-cooled inductor may be used in any application where liquid or refrigerant cooling is available and a reduction in size and weight of a magnetic component is desired.Type: GrantFiled: October 30, 2007Date of Patent: June 7, 2011Assignee: Johnson Controls Technology CompanyInventors: Harold R. Schnetzka, Ivan Jadric, Shreesha Adiga Manoor, Steve Hoover, Kathleen S. Rogers, Mustafa Kemal Yanik
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Publication number: 20110101907Abstract: A grounding system for a semiconductor module of a variable speed drive includes a first conductive layer, a second conductive layer; a substrate disposed between the first conductive layer and the second conductive layer; and a base attached to the second conductive layer, the base being connected to earth ground via a grounding harness. The first conductive layer is in electrical contact with the semiconductor module and the substrate, and electrically insulated from the second conductive layer by the substrate. The second conductive layer is in electrical contact with the substrate and disposed between the substrate and the base in electrical communication with an earth ground. The first conductive layer, the substrate and the second conductive layer form a capacitance path between the semiconductor module and the base as well as electrical conductors and the base for reduction circulating currents within the semiconductor module.Type: ApplicationFiled: July 8, 2009Publication date: May 5, 2011Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANYInventors: Konstantin Borisov, Michael S. Todd, Shreesha Adiga-Manoor, Ivan Jadric
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Patent number: 7764041Abstract: Systems and methods for synchronous operation of variable speed drives having active converters include extending the synchronous operation of an active converter to the AC mains voltage during complete line dropout. A phase angle control circuit includes a squaring amplifier, a first phase-lock loop circuit associated and a second phase-lock loop circuit. The squaring amplifier receives the AC power source and outputs a rectangular output signal to a pair of phase lock loop (PLL) circuits. The first PLL circuit with a first lag-lead filter is configured with a high cutoff frequency to provide the converter stage with a phase angle parameter; and the second phase-lock loop circuit including a second lag-lead filter configured to have a low cutoff frequency to provide the lag-lead filter the capability of storing the phase angle of the mains voltage during mains interruption.Type: GrantFiled: October 31, 2007Date of Patent: July 27, 2010Assignee: Johnson Controls Technology CompanyInventors: Harold R. Schnetzka, Shreesha Adiga Manoor
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Patent number: 7746020Abstract: Systems and methods for improved Variable Speed Drives having active inverters include an input filter for filtering common mode and differential mode currents. A three-phase inductor has three windings, each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and a three-phase input capacitor bank connected in a wye configuration to the three center taps at one end, and to a common point at the opposite end. The three-phase input capacitor bank provides a short circuit for frequencies above a predetermined fundamental frequency for shunting such frequencies through the three phase capacitor bank, while passing the predetermined fundamental frequency to an input AC power source.Type: GrantFiled: October 31, 2007Date of Patent: June 29, 2010Assignee: Johnson Controls Technology CompanyInventors: Harold R. Schnetzka, Ivan Jadric, Shreesha Adiga Manoor
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Publication number: 20100083693Abstract: A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive receives an input AC power at a fixed input AC voltage and a fixed input frequency, and provides an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter and configured to filter and store the DC voltage from the converter. An inverter is connected to the DC link. A motor is connectable to the compressor for powering the compressor. A controller is arranged to control switching in the converter and the inverter. The controller is arranged to apply randomized pulse width modulation to vary the switching frequency of transistors in the converter and the inverter at each switching cycle. The motor may be a permanent magnet synchronous motor.Type: ApplicationFiled: October 2, 2009Publication date: April 8, 2010Applicant: Johnson Controls Technology CompanyInventors: Michael S. Todd, Zhiqiao Wu, Kanishk Dubey, Justin Drew Warner, Konstantin Borisov, Scott V. Slothower, John C. Hansen, Ivan Jadric, Shreesha Adiga-Manoor