Patents by Inventor Grigoris Kostakis
Grigoris Kostakis 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: 20230141386Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: ApplicationFiled: October 27, 2022Publication date: May 11, 2023Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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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: 11527879Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: GrantFiled: September 23, 2019Date of Patent: December 13, 2022Assignee: RIPD IP DEVELOPMENT LTDInventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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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: 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: 20200021098Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: ApplicationFiled: September 23, 2019Publication date: January 16, 2020Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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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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Patent number: 10447023Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: GrantFiled: March 16, 2016Date of Patent: October 15, 2019Assignee: RIPD IP Development LtdInventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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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: 20160276821Abstract: A crowbar module includes first and second electrical terminals, a module housing, and first and second crowbar units. The first crowbar unit is disposed in the module housing and includes a first thyristor electrically connected between the first and second electrical terminals. The second crowbar unit is disposed in the module housing and includes a second thyristor electrically connected between the first and second electrical terminals in electrical parallel with the first crowbar unit.Type: ApplicationFiled: March 16, 2016Publication date: September 22, 2016Inventors: Zafiris G. Politis, Grigoris Kostakis, Thomas Tsovilis, Kostas Bakatsias
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Patent number: 9229048Abstract: Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.Type: GrantFiled: September 12, 2013Date of Patent: January 5, 2016Assignee: Raycap Intellectual Property Ltd.Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis
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Patent number: 9231399Abstract: A circuit protection device includes an overvoltage monitor circuit that is operable to monitor a power supply circuit to detect an overvoltage condition on the power supply circuit and to change a state of an overvoltage output responsive to the overvoltage condition on the power supply circuit. A bi-directional switch is operable to interrupt or limit current flow though the power supply circuit responsive to the change in the state of the overvoltage output. A bi-directional voltage limiter is connected across output terminals of the circuit protection device and is operable to limit an overvoltage to a predefined voltage limit.Type: GrantFiled: August 27, 2012Date of Patent: January 5, 2016Assignee: Raycap Intellectual Property Ltd.Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis, Konstantinos Samaras
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Patent number: 9099860Abstract: A suppression system provides more effective protection for communication stations with distributed radio and power systems. The suppression system provides surge protection both locally close to the radio station building where the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. Local and remote suppression units may include monitor circuitry that monitor remote and local DC voltage levels and alarm conditions. The alarm conditions may include over-voltage protection failures, intrusions, and/or water infiltration. Displays on both the local and remote suppression units identify the voltage levels and alarm conditions.Type: GrantFiled: December 9, 2013Date of Patent: August 4, 2015Assignee: RAYCAP INTELLECTUAL PROPERTY LTD.Inventors: Jonathan V. Martinez, Shawn A. Warner, Konstantinos Bakatsias, Grigoris Kostakis, Robert A. Miller
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Publication number: 20150061692Abstract: Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.Type: ApplicationFiled: September 12, 2013Publication date: March 5, 2015Applicant: Raycap Intellectual Property Ltd.Inventors: Grigoris Kostakis, Evaggelia Giannelaki, Thomas Tsovilis, Zafiris Politis