Patents by Inventor Fotis Xepapas
Fotis Xepapas 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: 20240120728Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: ApplicationFiled: December 14, 2023Publication date: April 11, 2024Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Patent number: 11881704Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: GrantFiled: May 27, 2022Date of Patent: January 23, 2024Assignee: RIPD RESEARCH AND IP DEVELOPMENT LTD.Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Publication number: 20220399714Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: ApplicationFiled: May 27, 2022Publication date: December 15, 2022Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Patent number: 11374396Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: GrantFiled: September 20, 2019Date of Patent: June 28, 2022Assignee: RIPD RESEARCH AND IP DEVELOPMENT LTD.Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Patent number: 11165246Abstract: An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.Type: GrantFiled: May 27, 2020Date of Patent: November 2, 2021Assignee: RIPD Research and IP Development Ltd.Inventors: Tine Tav{hacek over (c)}ar, Sa{hacek over (s)}a Rustja, Alexis Chorozoglou, George Peppas, Fotis Xepapas, Zafiris G. Politis
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Patent number: 11114232Abstract: An inductor assembly includes a coil including a spirally wound metal foil.Type: GrantFiled: August 28, 2018Date of Patent: September 7, 2021Assignee: RAYCAP IP DEVELOPMENT LTDInventors: Grigoris Kostakis, Megaklis Marathias, Fotis Xepapas, Kostas Bakatsias, George Peppas, Zafiris G. Politis
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Patent number: 10812664Abstract: A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (VRRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (VIN) from a DC power supply and generates an output voltage (VOUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the VRRH measurement and then adds different voltage steps to VIN so VOUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.Type: GrantFiled: January 19, 2018Date of Patent: October 20, 2020Assignee: RAYCAP S.A.Inventors: Grigoris Kostakis, Anestis Kolovos, Nikolaol Tsakiridis, Michael C. Bloxham, Shawn A. Warner, Fotis Xepapas, Zafiris G. Politis
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Publication number: 20200295562Abstract: An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.Type: ApplicationFiled: May 27, 2020Publication date: September 17, 2020Inventors: Tine Tavcar, Sasa Rustja, Alexis Chorozoglou, George Peppas, Fotis Xepapas, Zafiris G. Politis
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Patent number: 10707678Abstract: An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.Type: GrantFiled: October 27, 2017Date of Patent: July 7, 2020Assignee: RIPD RESEARCH AND IP DEVELOPMENT LTD.Inventors: Tine Tav{hacek over (c)}ar, Sa{hacek over (s)}a Rustja, Alexis Chorozoglou, George Peppas, Fotis Xepapas, Zafiris G. Politis
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Publication number: 20200014191Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: ApplicationFiled: September 20, 2019Publication date: January 9, 2020Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Patent number: 10447026Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: GrantFiled: December 23, 2016Date of Patent: October 15, 2019Assignee: RIPD IP DEVELOPMENT LTDInventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Publication number: 20190080837Abstract: An inductor assembly includes a coil including a spirally wound metal foil.Type: ApplicationFiled: August 28, 2018Publication date: March 14, 2019Inventors: Grigoris Kostakis, Megaklis Marathias, Fotis Xepapas, Kostas Bakatsias, George Peppas, Zafiris G. Politis
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Publication number: 20180213091Abstract: A power transmission system includes a voltage measurement device located on a tower or rooftop for measuring a voltage (VRRH) at a top end of a DC cable connected to a remote radio head (RRH). A voltage control system receives an input voltage (VIN) from a DC power supply and generates an output voltage (VOUT) at a base end of the DC cable. The voltage control system calculates a voltage drop on the DC cable based on the VRRH measurement and then adds different voltage steps to VIN so VOUT compensates for the voltage drop. Calculating the voltage drop allows the PTS to more efficiently supply power to RRHs without having to increase the size of DC power cables.Type: ApplicationFiled: January 19, 2018Publication date: July 26, 2018Inventors: Grigoris KOSTAKIS, Anestis KOLOVOS, Nikolaol TSAKIRIDIS, Michael C. BLOXHAM, Shawn A. WARNER, Fotis XEPAPAS, Zafiris G. POLITIS
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Publication number: 20180183230Abstract: A circuit protection device is provided. The circuit protection device includes an active energy absorber that is coupled between two power lines in an electrical power distribution system and is configured to selectively conduct fault current responsive to overvoltage conditions. The active energy absorber includes an overvoltage protection module that includes two thyristors that are connected in anti-parallel with one another and a varistor that is connected with the overvoltage protection module as a series circuit. The series circuit including the varistor and the overvoltage protection module is connected between the power lines.Type: ApplicationFiled: December 23, 2016Publication date: June 28, 2018Inventors: Grigoris Kostakis, Zafiris G. Politis, Fotis Xepapas, Alexis Chorozoglou, Christos Prevezianos
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Publication number: 20180183232Abstract: An overvoltage protection device includes a first electrode member, a second electrode member, and a varistor assembly. The varistor assembly includes: a plurality of varistor wafers each formed of a varistor material; and at least one electrically conductive interconnect member connecting the varistor wafers in electrical parallel between the first and second electrode members. The varistor wafers are axially stacked between the first and second electrodes.Type: ApplicationFiled: October 27, 2017Publication date: June 28, 2018Inventors: Tine Tavcar, Sasa Rustja, Alexis Chorozoglou, George Peppas, Fotis Xepapas, Zafiris G. Politis
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Patent number: 8743525Abstract: An overvoltage protection device includes first and second electrically conductive electrode members and a varistor member formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing first and second metal surfaces in the overvoltage protection device to one another using an electric arc.Type: GrantFiled: July 18, 2012Date of Patent: June 3, 2014Assignee: Raycap Intellectual Property, LtdInventors: Fotis Xepapas, Evaggelia Giannelaki, Grigoris Kostakis, Zafiris Politis, Kostas Samaras
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Publication number: 20130335869Abstract: An overvoltage protection device includes first and second electrically conductive electrode members and a varistor member formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing first and second metal surfaces in the overvoltage protection device to one another using an electric arc.Type: ApplicationFiled: July 18, 2012Publication date: December 19, 2013Inventors: Fotis Xepapas, Evaggelia Giannelaki, Grigoris Kostakis, Zafiris Politis, Kostas Samaras