Patents by Inventor Rajapandian Ayyanar
Rajapandian Ayyanar 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: 20230291203Abstract: A system reconfigures a photovoltaic array used in solar energy based on observed shading conditions to determine an optimal topology of the photovoltaic array to maximize power output. Specifically, the system is designed to reconfigure a photovoltaic array when the photovoltaic array is partially shaded. The system uses a neural network model to determine a topology that maximizes power output of the photovoltaic array based on irradiance data obtained from the photovoltaic array.Type: ApplicationFiled: March 14, 2023Publication date: September 14, 2023Applicant: Arizona Board of Regents on Behalf of Arizona State UniversityInventors: Vivek Sivaraman Narayanaswamy, Rajapandian Ayyanar, Cihan Tepedelenlioglu, Andreas Spanias
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Patent number: 11616471Abstract: Various embodiments for a connection topology reconfiguration technique for photovoltaic (PV) arrays to maximize power output under partial shading and fault conditions using neural networks are disclosed herein.Type: GrantFiled: February 21, 2020Date of Patent: March 28, 2023Assignee: Arizona Board of Regents on Behalf of Arizona State UniversityInventors: Vivek Sivaraman Narayanaswamy, Andreas Spanias, Rajapandian Ayyanar, Cihan Tepedelenlioglu
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Patent number: 11152849Abstract: A soft-switching, high-performance single-phase alternating current (AC)-direct current (DC) converter is provided. The AC-DC converter described herein provides a new circuit topology for single-stage, single-phase or multi-phase AC-DC power conversion with power factor correction (PFC) and galvanic isolation using a high-frequency isolation transformer. The AC-DC converter improves power conversion efficiency and power density—two of the most important metrics for a power converter. It achieves soft switching for high frequency switches in the circuit, leading to higher efficiency and lower electromagnetic interference (EMI).Type: GrantFiled: June 5, 2020Date of Patent: October 19, 2021Assignee: Arizona Board of Regents on behalf of Arizona State UniversityInventor: Rajapandian Ayyanar
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Patent number: 10879839Abstract: Power converter circuitry includes a direct current (DC) input comprising a first DC input node and a second DC input node, an alternating current (AC) output comprising a first AC output node coupled to the first DC input node and a second AC output node, a first boost switch coupled between the second DC input node and a boost intermediate node, a second boost switch coupled between the boost intermediate node and a common node, a boost inductor coupled between the boost intermediate node and the first DC input node, a link capacitor coupled between the second DC input node and the common node, a first half-bridge switch coupled between the second DC input node and a half-bridge intermediate node, a second half-bridge switch coupled between the half-bridge intermediate node and the common node, and a half-bridge inductor coupled between the half-bridge intermediate node and the second AC output node.Type: GrantFiled: December 5, 2016Date of Patent: December 29, 2020Assignee: Arizona Board of Regents on behalf of Arizona State UniversityInventors: Rajapandian Ayyanar, Yinglai Xia, Jinia Roy
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Publication number: 20200395839Abstract: A soft-switching, high-performance single-phase alternating current (AC)-direct current (DC) converter is provided. The AC-DC converter described herein provides a new circuit topology for single-stage, single-phase or multi-phase AC-DC power conversion with power factor correction (PFC) and galvanic isolation using a high-frequency isolation transformer. The AC-DC converter improves power conversion efficiency and power density—two of the most important metrics for a power converter. It achieves soft switching for high frequency switches in the circuit, leading to higher efficiency and lower electromagnetic interference (EMI).Type: ApplicationFiled: June 5, 2020Publication date: December 17, 2020Applicant: Arizona Board of Regents on behalf of Arizona State UniversityInventor: Rajapandian Ayyanar
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Publication number: 20200274484Abstract: Various embodiments for a connection topology reconfiguration technique for photovoltaic (PV) arrays to maximize power output under partial shading and fault conditions using neural networks are disclosed herein.Type: ApplicationFiled: February 21, 2020Publication date: August 27, 2020Applicant: Arizona Board of Regents on Behalf of Arizona State UniversityInventors: Vivek Sivaraman Narayanaswamy, Andreas Spanias, Rajapandian Ayyanar, Cihan Tepedelenlioglu
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Publication number: 20180375465Abstract: Power converter circuitry includes a direct current (DC) input comprising a first DC input node and a second DC input node, an alternating current (AC) output comprising a first AC output node coupled to the first DC input node and a second AC output node, a first boost switch coupled between the second DC input node and a boost intermediate node, a second boost switch coupled between the boost intermediate node and a common node, a boost inductor coupled between the boost intermediate node and the first DC input node, a link capacitor coupled between the second DC input node and the common node, a first half-bridge switch coupled between the second DC input node and a half-bridge intermediate node, a second half-bridge switch coupled between the half-bridge intermediate node and the common node, and a half-bridge inductor coupled between the half-bridge intermediate node and the second AC output node.Type: ApplicationFiled: December 5, 2016Publication date: December 27, 2018Applicant: Arizona Board of Regents for and on behalf of Arizona State UniversityInventors: Rajapandian Ayyanar, Yinglai Xia, Jinia Roy
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Publication number: 20170005563Abstract: An auxiliary circuit may be used to assist in the operation of a power converter to obtain zero-voltage switching. For example, an auxiliary circuit including a low-voltage switch, a diode, and an inductor may be coupled to a power converter, such as a DC-to-DC buck converter or a DC-to-AC inverter or rectifier. The auxiliary circuit may consume current during transitions in the power converter to obtain zero-voltage switching.Type: ApplicationFiled: January 6, 2015Publication date: January 5, 2017Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITYInventor: Rajapandian AYYANAR
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Patent number: 9413269Abstract: Circuits and methods for photovoltaic inverters are provided. In some embodiments, a power inverter circuit is provided, the inverter comprising: an input terminal for a direct current source coupled to a first conductor; a first side of a capacitor coupled to the input terminal; a second input terminal for the direct current source coupled to first sides of a first switch and second switch; a second side of the capacitor coupled to first sides of a third switch and fourth switch; a first side of a first inductor coupled to the first input terminal, the first side of the capacitor and the first conductor; a second side of the first inductor coupled to second sides of the first switch and third switch; and a first side of a second inductor coupled to a second conductor, and second sides of the second switch and fourth switch.Type: GrantFiled: June 25, 2013Date of Patent: August 9, 2016Assignee: Arizona Board of Regents, for and on behalf of, Arizona State UniversityInventor: Rajapandian Ayyanar
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Publication number: 20150372615Abstract: Circuits and methods for photovoltaic inverters are provided. In some embodiments, a power inverter circuit is provided, the inverter comprising: an input terminal for a direct current source coupled to a first conductor; a first side of a capacitor coupled to the input terminal; a second input terminal for the direct current source coupled to first sides of a first switch and second switch; a second side of the capacitor coupled to first sides of a third switch and fourth switch; a first side of a first inductor coupled to the first input terminal, the first side of the capacitor and the first conductor; a second side of the first inductor coupled to second sides of the first switch and third switch; and a first side of a second inductor coupled to a second conductor, and second sides of the second switch and fourth switch.Type: ApplicationFiled: June 25, 2013Publication date: December 24, 2015Applicant: Arizona Board of Regents, for and on behalf of, Arizona State UniversityInventor: Rajapandian Ayyanar
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Patent number: 8649195Abstract: Systems and methods for controlling a modular three-phase converter including two or more interleaved, parallel connected Voltage Source Converters (VSCs) utilizing a hybrid Space Vector Pulse Width Modulation (SVM) control scheme are provided. For the hybrid SVM control scheme, six active vectors utilized for SVM define six sectors in a space vector plane. Each sector is divided into two or more regions having corresponding optimal SVM switching sequences. In operation, a revolving reference voltage vector is sampled to provide a reference voltage vector. The SVM controller then identifies one of the regions in one of the sectors that corresponds to an angle and, in some embodiments, a magnitude of the revolving reference voltage vector and applies the corresponding optimal SVM switching sequence to the two or more interleaved, parallel connected VSCs.Type: GrantFiled: April 7, 2011Date of Patent: February 11, 2014Assignees: Arizona Board of Regents for and on Behalf of Arizona State University, Peregrine Power LLCInventors: Xiaolin Mao, Rajapandian Ayyanar, Amit Kumar Jain
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Patent number: 8587975Abstract: A Dual Active Bridge (DAB) converter and a Pulse Width Modulation (PWM) scheme for controlling the DAB converter are disclosed. In general, the DAB converter includes a transformer, a first H-bridge that is connected to a primary winding of the transformer and controlled via first control signals, and a second H-bridge that is connected to a secondary winding of the transformer and controlled via second control signals. A controller provides the first and second control signals based on an input-to-output voltage ratio and load of the DAB converter such that, in addition to phase shift control, PWM control is simultaneously applied to both the first H-bridge and the second H-bridge when the DAB converter operates at low power and PWM control is applied to only one of the first H-bridge and the second H-bridge when the DAB converter operates above low power.Type: GrantFiled: April 1, 2011Date of Patent: November 19, 2013Assignee: Arizona Board of Regents for and on behalf of Arizona State UniversityInventors: Amit Kumar Jain, Rajapandian Ayyanar
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Patent number: 8243410Abstract: A transient voltage compensation system is provided. The transient voltage compensation system includes a processor and a first voltage regulator coupled to the processor, wherein the first voltage regulator is to deliver a load current to the processor at an output voltage. The transient voltage compensation system also includes a second voltage regulator coupled to the first voltage regulator, wherein the second voltage regulator is to regulate the output voltage in response to transient loads of the processor.Type: GrantFiled: May 7, 2008Date of Patent: August 14, 2012Assignee: Intel CorporationInventors: Rajapandian Ayyanar, William J. Lambert, Shamala A. Chickamenahalli
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Publication number: 20120147639Abstract: Systems and methods for controlling a modular three-phase converter including two or more interleaved, parallel connected Voltage Source Converters (VSCs) utilizing a hybrid Space Vector Pulse Width Modulation (SVM) control scheme are provided. For the hybrid SVM control scheme, six active vectors utilized for SVM define six sectors in a space vector plane. Each sector is divided into two or more regions having corresponding optimal SVM switching sequences. In operation, a revolving reference voltage vector is sampled to provide a reference voltage vector. The SVM controller then identifies one of the regions in one of the sectors that corresponds to an angle and, in some embodiments, a magnitude of the revolving reference voltage vector and applies the corresponding optimal SVM switching sequence to the two or more interleaved, parallel connected VSCs.Type: ApplicationFiled: April 7, 2011Publication date: June 14, 2012Applicants: Peregrine Power LLC, Arizona Board of Regents for and on behalf of Arizona State UniversityInventors: Xiaolin Mao, Rajapandian Ayyanar, Amit Kumar Jain
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Publication number: 20110249472Abstract: A Dual Active Bridge (DAB) converter and a Pulse Width Modulation (PWM) scheme for controlling the DAB converter are disclosed. In general, the DAB converter includes a transformer, a first H-bridge that is connected to a primary winding of the transformer and controlled via first control signals, and a second H-bridge that is connected to a secondary winding of the transformer and controlled via second control signals. A controller provides the first and second control signals based on an input-to-output voltage ratio and load of the DAB converter such that, in addition to phase shift control, PWM control is simultaneously applied to both the first H-bridge and the second H-bridge when the DAB converter operates at low power and PWM control is applied to only one of the first H-bridge and the second H-bridge when the DAB converter operates above low power.Type: ApplicationFiled: April 1, 2011Publication date: October 13, 2011Applicants: Peregrine Power LLC, Arizona Board of Regents for and on behalf of Arizona State UniversityInventors: Amit Kumar Jain, Rajapandian Ayyanar
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Publication number: 20090279224Abstract: A transient voltage compensation system is provided. The transient voltage compensation system includes a processor and a first voltage regulator coupled to the processor, wherein the first voltage regulator is to deliver a load current to the processor at an output voltage. The transient voltage compensation system also includes a second voltage regulator coupled to the first voltage regulator, wherein the second voltage regulator is to regulate the output voltage in response to transient loads of the processor.Type: ApplicationFiled: May 7, 2008Publication date: November 12, 2009Inventors: Rajapandian Ayyanar, William J. Lambert, Shamala A. Chickamenahalli
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Patent number: 6611444Abstract: A DC—DC power converter includes input terminals and a rectifier circuit. An additional circuit is connected to the input terminals and the rectifier. The latter circuit is adapted to generate a varying voltage at output terminals of the rectifier that varies in amplitude from a maximum voltage value to a non-zero voltage value between the maximum voltage value and zero.Type: GrantFiled: October 10, 2001Date of Patent: August 26, 2003Assignee: Regents of the University of MinnesotaInventors: Rajapandian Ayyanar, Ned Mohan
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Publication number: 20020034083Abstract: A DC-DC power converter includes input terminals and a rectifier circuit. An additional circuit is connected to the input terminals and the rectifier. The latter circuit is adapted to generate a varying voltage at output terminals of the rectifier that varies in amplitude from a maximum voltage value to a non-zero voltage value between the maximum voltage value and zero.Type: ApplicationFiled: October 10, 2001Publication date: March 21, 2002Inventors: Rajapandian Ayyanar, Ned Mohan
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Patent number: 6310785Abstract: A DC-DC power converter includes input terminals and a rectifier circuit. An additional circuit is connected to the input terminals and the rectifier. The latter circuit is adapted to generate a varying voltage at output terminals of the rectifier that varies in amplitude from a maximum voltage value to a non-zero voltage value between the maximum voltage value and zero.Type: GrantFiled: August 22, 2000Date of Patent: October 30, 2001Assignee: Regents of the University of MinnesotaInventors: Rajapandian Ayyanar, Ned Mohan