Patents by Inventor Anish Prasai
Anish Prasai 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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Patent number: 11888406Abstract: An AC-AC converter can include a stack of four switches. An input of the converter can be coupled across the stack of four switches, and an output of the converter can be taken from first terminal coupled to a connection point of first and second switches of the stack and a second terminal coupled to a connection point of third and fourth switches of the stack. The converter can further include a controller that operates the switches such that during a positive half cycle of an AC input voltage, the first and second switches are operated with an alternating 50% duty cycle and the third and fourth switches are constantly on, and during the negative half cycle of the AC input voltage, the third and fourth switches are operated with an alternating 50% duty cycle and the first and second switches are constantly on.Type: GrantFiled: December 2, 2021Date of Patent: January 30, 2024Assignee: Apple Inc.Inventors: Ashish K. Sahoo, Jie Lu, Brandon Pierquet, Anish Prasai
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Patent number: 11876458Abstract: An electrical system can include an isolated bidirectional converter (having an input couplable to a grid connection and an output couplable to a battery) and an isolated converter (having an input coupled to the input of the isolated bidirectional converter and couplable to the grid connection, with an AC output coupled to a convenience outlet). The electrical system can further include a controller that controls operation of the converters to operate in one of a plurality of modes including a charging mode in which the isolated bidirectional converter operates in a forward direction to charge the battery and the non-isolated converter powers the convenience outlet from the grid connection, and a non-charging mode in which the isolated bidirectional converter operates in a reverse direction to power the non-isolated converter from the battery and the non-isolated converter powers the convenience outlet.Type: GrantFiled: December 2, 2021Date of Patent: January 16, 2024Assignee: Apple Inc.Inventors: Ashish K. Sahoo, Jie Lu, Brandon Pierquet, Anish Prasai
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Publication number: 20230096722Abstract: An electrical system can include a first bidirectional AC-DC converter having an input couplable to a grid connection and an output couplable to a battery and a second bidirectional AC-DC converter having an input couplable to the grid connection or a convenience outlet and an output couplable to the battery. The electrical system can further include a controller that controls the first and second converters to operate in a plurality of modes including a two-stage charging mode in which the first and second converters operate in a forward direction to charge the battery, a single-stage charging mode in which the first converter operates in a forward direction to charge the battery and the second converter operates in a reverse direction to power the convenience outlet, and a non-charging mode in which the first converter is idle and the second converter operates in a reverse direction to power the convenience outlet.Type: ApplicationFiled: December 2, 2021Publication date: March 30, 2023Inventors: Ashish K. Sahoo, Jie Lu, Brandon Pierquet, Anish Prasai
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Publication number: 20230089072Abstract: An electrical system can include an isolated bidirectional converter (having an input couplable to a grid connection and an output couplable to a battery) and an isolated converter (having an input coupled to the input of the isolated bidirectional converter and couplable to the grid connection, with an AC output coupled to a convenience outlet). The electrical system can further include a controller that controls operation of the converters to operate in one of a plurality of modes including a charging mode in which the isolated bidirectional converter operates in a forward direction to charge the battery and the non-isolated converter powers the convenience outlet from the grid connection, and a non-charging mode in which the isolated bidirectional converter operates in a reverse direction to power the non-isolated converter from the battery and the non-isolated converter powers the convenience outlet.Type: ApplicationFiled: December 2, 2021Publication date: March 23, 2023Inventors: Ashish K. Sahoo, Jie Lu, Brandon Pierquet, Anish Prasai
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Publication number: 20230089299Abstract: An AC-AC converter can include a stack of four switches. An input of the converter can be coupled across the stack of four switches, and an output of the converter can be taken from first terminal coupled to a connection point of first and second switches of the stack and a second terminal coupled to a connection point of third and fourth switches of the stack. The converter can further include a controller that operates the switches such that during a positive half cycle of an AC input voltage, the first and second switches are operated with an alternating 50% duty cycle and the third and fourth switches are constantly on, and during the negative half cycle of the AC input voltage, the third and fourth switches are operated with an alternating 50% duty cycle and the first and second switches are constantly on.Type: ApplicationFiled: December 2, 2021Publication date: March 23, 2023Inventors: Ashish K. Sahoo, Jie Lu, Brandon Pierquet, Anish Prasai
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Patent number: 10547175Abstract: Systems and methods for an edge of network voltage control of a power grid are described. A system includes a distribution power network, a plurality of loads (at or near an edge of the distribution power network), and a plurality of shunt-connected, switch-controlled volt ampere reactive (VAR) sources also located at the edge or near the edge of the distribution power network where they may each detect a proximate voltage. The VAR source can determine whether to enable a VAR compensation component therein based on the proximate voltage and adjust network VAR by controlling a switch to enable the VAR compensation component. Further still, each of the VAR sources may be integrated within a customer-located asset, such as a smart meter, and a multitude of such VAR sources can be used to effectuate a distributed controllable VAR source (DCVS) cloud network.Type: GrantFiled: September 13, 2018Date of Patent: January 28, 2020Assignee: Varentec, Inc.Inventors: Deepakraj M. Divan, Rohit Moghe, Anish Prasai, Andrew Dillon
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Patent number: 10541533Abstract: Systems and methods for an edge of network voltage control of a power grid are described. A system includes a distribution power network, a plurality of loads (at or near an edge of the distribution power network), and a plurality of shunt-connected, switch-controlled volt ampere reactive (VAR) sources also located at the edge or near the edge of the distribution power network where they may each detect a proximate voltage. The VAR source can determine whether to enable a VAR compensation component therein based on the proximate voltage and adjust network VAR by controlling a switch to enable the VAR compensation component. Further still, each of the VAR sources may be integrated within a customer-located asset, such as a smart meter, and a multitude of such VAR sources can be used to effectuate a distributed controllable VAR source (DCVS) cloud network.Type: GrantFiled: March 16, 2015Date of Patent: January 21, 2020Assignee: Varentec, Inc.Inventors: Deepakraj M. Divan, Rohit Moghe, Anish Prasai, Andrew Dillon
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Publication number: 20190089158Abstract: Systems and methods for an edge of network voltage control of a power grid are described. A system includes a distribution power network, a plurality of loads (at or near an edge of the distribution power network), and a plurality of shunt-connected, switch-controlled volt ampere reactive (VAR) sources also located at the edge or near the edge of the distribution power network where they may each detect a proximate voltage. The VAR source can determine whether to enable a VAR compensation component therein based on the proximate voltage and adjust network VAR by controlling a switch to enable the VAR compensation component. Further still, each of the VAR sources may be integrated within a customer-located asset, such as a smart meter, and a multitude of such VAR sources can be used to effectuate a distributed controllable VAR source (DCVS) cloud network.Type: ApplicationFiled: September 13, 2018Publication date: March 21, 2019Applicant: Varentec, Inc.Inventors: Deepakraj M. Divan, Rohit Moghe, Anish Prasai, Andrew Dillon
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Patent number: 9983613Abstract: Methods and systems of network voltage regulating transformers are provided. A network voltage regulating transformer (NVRT) may provide voltage transformation, isolation, and regulation. A NVRT may further provide power factor corrections. Multiple NVRTs may operate autonomously and collectively thereby achieving an edge of network voltage control when installed to a power system. A NVRT comprises a transformer, a VAR source, and a control module. The input current (i.e., the current through the primary side of the transformer), the output current (i.e., the current through the secondary side of the transformer), and/or the output voltage (i.e., the voltage across the secondary side of the transformer) may be monitored.Type: GrantFiled: March 10, 2017Date of Patent: May 29, 2018Assignee: Varentec, Inc.Inventors: Deepakraj M. Divan, Anish Prasai
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Publication number: 20170235323Abstract: Methods and systems of network voltage regulating transformers are provided. A network voltage regulating transformer (NVRT) may provide voltage transformation, isolation, and regulation. A NVRT may further provide power factor corrections. Multiple NVRTs may operate autonomously and collectively thereby achieving an edge of network voltage control when installed to a power system. A NVRT comprises a transformer, a VAR source, and a control module. The input current (i.e., the current through the primary side of the transformer), the output current (i.e., the current through the secondary side of the transformer), and/or the output voltage (i.e., the voltage across the secondary side of the transformer) may be monitored.Type: ApplicationFiled: March 10, 2017Publication date: August 17, 2017Applicant: VARENTEC, INC.Inventors: DEEPAKRAJ M. DIVAN, ANISH PRASAI
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Patent number: 9639104Abstract: Methods and systems of network voltage regulating transformers are provided. A network voltage regulating transformer (NVRT) may provide voltage transformation, isolation, and regulation. A NVRT may further provide power factor corrections. Multiple NVRTs may operate autonomously and collectively thereby achieving an edge of network voltage control when installed to a power system. A NVRT comprises a transformer, a VAR source, and a control module. The input current (i.e., the current through the primary side of the transformer), the output current (i.e., the current through the secondary side of the transformer), and/or the output voltage (i.e., the voltage across the secondary side of the transformer) may be monitored.Type: GrantFiled: October 16, 2013Date of Patent: May 2, 2017Assignee: VARENTEC, INC.Inventors: Deepakraj M Divan, Anish Prasai
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Patent number: 9590421Abstract: Dynamic power flow controllers are provided. A dynamic power flow controller may comprise a transformer and a power converter. The power converter is subject to low voltage stresses and not floated at line voltage. In addition, the power converter is rated at a fraction of the total power controlled. A dynamic power flow controller controls both the real and the reactive power flow between two AC sources having the same frequency. A dynamic power flow controller inserts a voltage with controllable magnitude and phase between two AC sources; thereby effecting control of active and reactive power flows between two AC sources.Type: GrantFiled: April 23, 2014Date of Patent: March 7, 2017Assignee: VARENTEC, INC.Inventors: Deepakraj M. Divan, Anish Prasai
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Patent number: 9502901Abstract: An area electric power system includes a number of direct current power sources, and a number of inverters operatively associated with the number of direct current power sources. Each of the number of inverters is structured to provide real power and controlled reactive power injection to detect islanding. An output is powered by the number of inverters. A number of electrical switching apparatus are structured to electrically connect the number of inverters to and electrically disconnect the number of inverters from a utility grid. A number of devices are structured to detect islanding with respect to the utility grid responsive to a number of changes of alternating current frequency or voltage of the output.Type: GrantFiled: November 6, 2012Date of Patent: November 22, 2016Assignee: EATON CORPORATIONInventors: Vijay Bhavaraju, Richard P. Peplinski, Anish Prasai, Uday Mhaskar
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Patent number: 9502904Abstract: A power conversion system includes a number of photovoltaic arrays, a number of inverters, a transformer, and processor. The processor is structured to control the number of inverters and operate the power conversion system to provide maximum efficiency of power conversion by the number of photovoltaic arrays, the number of inverters and the transformer, and to maximize power output from the number of photovoltaic arrays.Type: GrantFiled: March 23, 2010Date of Patent: November 22, 2016Assignee: EATON CORPORATIONInventors: Vijay Bhavaraju, Richard P. Peplinski, Anish Prasai
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Publication number: 20160195891Abstract: Methods and systems of field upgradeable transformers are provided. Voltage transformation, intelligence, communications, and control are integrated in a flexible and cost effective manner. A field upgradeable transformer may comprise a transformer module and a cold plate. The transformer module provides voltage transformation. The transformer module is enclosed in a housing containing coolant with dielectric properties, such as mineral oil. The cold plate may be mounted to the housing and thermally coupled to the coolant. Interfaces to the primary side and/or secondary side of transformer module may be configured to be disposed on the surface of the housing. A field upgradable transformer may comprise various electronic modules that are configured to be mounted to the cold plate. An electronic module may be thermally coupled to the coolant, and may be configured to be coupled to the transformer module.Type: ApplicationFiled: March 7, 2016Publication date: July 7, 2016Applicant: VARENTEC, INC.Inventors: Deepakraj M. Divan, Anish Prasai
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Publication number: 20160190950Abstract: Methods and systems of field upgradeable transformers are provided. Voltage transformation, intelligence, communications, and control are integrated in a flexible and cost effective manner. A field upgradeable transformer may comprise a transformer module and a cold plate. The transformer module provides voltage transformation. The transformer module is enclosed in a housing containing coolant with dielectric properties, such as mineral oil. The cold plate may be mounted to the housing and thermally coupled to the coolant. Interfaces to the primary side and/or secondary side of transformer module may be configured to be disposed on the surface of the housing. A field upgradable transformer may comprise various electronic modules that are configured to be mounted to the cold plate. An electronic module may be thermally coupled to the coolant, and may be configured to be coupled to the transformer module.Type: ApplicationFiled: March 7, 2016Publication date: June 30, 2016Applicant: VARENTEC, INC.Inventors: Deepakraj M. Divan, Anish Prasai
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Patent number: 9325171Abstract: Power flow controllers based on Imputed DC Link (IDCL) cells are provided. The IDCL cell is a self-contained power electronic building block (PEBB). The IDCL cell may be stacked in series and parallel to achieve power flow control at higher voltage and current levels. Each IDCL cell may comprise a gate drive, a voltage sharing module, and a thermal management component in order to facilitate easy integration of the cell into a variety of applications. By providing direct AC conversion, the IDCL cell based AC/AC converters reduce device count, eliminate the use of electrolytic capacitors that have life and reliability issues, and improve system efficiency compared with similarly rated back-to-back inverter system.Type: GrantFiled: February 1, 2013Date of Patent: April 26, 2016Assignee: GEORGIA TECH RESEARCH CORPORATION GEORGIA INSTITUTE OF TECHNOLOGYInventors: Deepakraj M. Divan, Anish Prasai, Jorge Hernendez, Rohit Moghe, Amrit Iyer, Rajendra Prasad Kandula
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Publication number: 20160099653Abstract: A power flow controller with a fractionally rated back-to-back (BTB) converter is provided. The power flow controller provide dynamic control of both active and reactive power of a power system. The power flow controller inserts a voltage with controllable magnitude and phase between two AC sources at the same frequency; thereby effecting control of active and reactive power flows between the two AC sources. A transformer may be augmented with a fractionally rated bi-directional Back to Back (B TB) converter. The fractionally rated BTB converter comprises a transformer side converter (TSC), a direct-current (DC) link, and a line side converter (LSC). By controlling the switches of the BTB converter, the effective phase angle between the two AC source voltages may be regulated, and the amplitude of the voltage inserted by the power flow controller may be adjusted with respect to the AC source voltages.Type: ApplicationFiled: December 15, 2015Publication date: April 7, 2016Applicant: Varentec, Inc.Inventors: DEEPAKRAJ M. DIVAN, RAJENDRA PRASAD KANDULA, ANISH PRASAI
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Patent number: 9304522Abstract: Systems and methods for dynamic AC line voltage regulation are provided. A simple and cost-effective method for achieving AC line voltage regulation in AC systems including split-phase systems, of which the voltage for each voltage line may be regulated over a specified range, is provided. Buck and boost regulation is achieved for lowering or increasing the line voltage, respectively, with reference to the incoming grid voltage. Systems for dynamic AC line voltage regulation may comprise an AC/AC converter which uses fractionally rated switches and magnetics that handle only a fraction of the load current, resulting in lower costs. The use of an AC snubber further provides safe and robust switching of the main switching devices by eliminating failure prone switching sequences that are dependent on accurate assessment of voltage and/or current polarity for AC or bi-directional switches.Type: GrantFiled: April 19, 2013Date of Patent: April 5, 2016Assignee: VARENTEC, INC.Inventors: Deepakraj M Divan, Anish Prasai
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Patent number: 9281756Abstract: A power flow controller with a fractionally rated back-to-back (BTB) converter is provided. The power flow controller provide dynamic control of both active and reactive power of a power system. The power flow controller inserts a voltage with controllable magnitude and phase between two AC sources at the same frequency; thereby effecting control of active and reactive power flows between the two AC sources. A transformer may be augmented with a fractionally rated bi-directional Back to Back (BTB) converter. The fractionally rated BTB converter comprises a transformer side converter (TSC), a direct-current (DC) link, and a line side converter (LSC). By controlling the switches of the BTB converter, the effective phase angle between the two AC source voltages may be regulated, and the amplitude of the voltage inserted by the power flow controller may be adjusted with respect to the AC source voltages.Type: GrantFiled: November 9, 2012Date of Patent: March 8, 2016Assignee: VARENTEC, INC.Inventors: Deepakraj M. Divan, Rajendra Prasad Kandula, Anish Prasai