Patents by Inventor Florian Vancu
Florian Vancu 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: 20240154405Abstract: An inrush current limiter circuit for a rectifier provides a flow of a current between a rectifying part of the rectifier and a filter capacitance. A power stage includes a power stage resistor and a power stage transistor disposed in parallel circuit arrangement to the power stage resistor. The power stage resistor conducts an amount of the current in dependence on the state of the power stage transistor, and the power stage transistor conducts an amount of the current in dependence on a charging of a gate capacitance of the power stage transistor.Type: ApplicationFiled: December 19, 2023Publication date: May 9, 2024Applicant: ABB Schweiz AGInventors: Florian Vancu, Markus Fueglister
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Publication number: 20240120830Abstract: A system for controlling an inductor freewheeling voltage includes first and second switches, a first diode, and an inductor. When open, the first switch connects a first terminal of the inductor with a power bus. The first switch is controlled by a first control signal. A first terminal of the first diode is connected to a ground, and a second terminal of the first diode is connected to the first terminal of the inductor. The first diode allows an electric current to pass from the ground to the first terminal of the inductor. When open, the second switch connects a second terminal of the inductor with the ground. A switch control circuit is controlled with a second control signal and keeps the second switch open or such that there is a voltage drop across the second switch.Type: ApplicationFiled: December 21, 2023Publication date: April 11, 2024Applicant: ABB Schweiz AGInventors: Florian Vancu, Markus Fueglister
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Publication number: 20230361566Abstract: Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning capacitors electrically coupled to the wireless-power transfer coil. The apparatus also includes a power converter circuit electrically coupled to the wireless-power transfer circuit. Additionally, the apparatus includes a signal generation circuit different from the power converter circuit and electrically coupled to one or more nodes between capacitors of the plurality of tuning capacitors. The signal generation circuit is configured to generate and inject a signal into the wireless-power transfer circuit at the nodes between the capacitors. The signal generation circuit includes a rejection filter tuned to an operating frequency of the wireless-power transfer coil.Type: ApplicationFiled: July 13, 2023Publication date: November 9, 2023Applicant: WiTricity CorporationInventors: Marcel Fischer, Mircea-Florian Vancu, Hans Peter Widmer, Prasanth Venugopal
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Patent number: 11728647Abstract: Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning capacitors electrically coupled to the wireless-power transfer coil. The apparatus also includes a power converter circuit electrically coupled to the wireless-power transfer circuit. Additionally, the apparatus includes a signal generation circuit different from the power converter circuit and electrically coupled to one or more nodes between capacitors of the plurality of tuning capacitors. The signal generation circuit is configured to generate and inject a signal into the wireless-power transfer circuit at the nodes between the capacitors. The signal generation circuit includes a rejection filter tuned to an operating frequency of the wireless-power transfer coil.Type: GrantFiled: September 15, 2022Date of Patent: August 15, 2023Assignee: WiTricity CorporationInventors: Marcel Fischer, Mircea-Florian Vancu, Hans Peter Widmer, Prasanth Venugopal
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Publication number: 20230010790Abstract: Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning capacitors electrically coupled to the wireless-power transfer coil. The apparatus also includes a power converter circuit electrically coupled to the wireless-power transfer circuit. Additionally, the apparatus includes a signal generation circuit different from the power converter circuit and electrically coupled to one or more nodes between capacitors of the plurality of tuning capacitors. The signal generation circuit is configured to generate and inject a signal into the wireless-power transfer circuit at the nodes between the capacitors. The signal generation circuit includes a rejection filter tuned to an operating frequency of the wireless-power transfer coil.Type: ApplicationFiled: September 15, 2022Publication date: January 12, 2023Applicant: WiTricity CorporationInventors: Marcel Fischer, Mircea-Florian Vancu, Hans Peter Widmer, Prasanth Venugopal
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Patent number: 11482921Abstract: Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning capacitors electrically coupled to the wireless-power transfer coil. The apparatus also includes a power converter circuit electrically coupled to the wireless-power transfer circuit. Additionally, the apparatus includes a signal generation circuit different from the power converter circuit and electrically coupled to one or more nodes between capacitors of the plurality of tuning capacitors. The signal generation circuit is configured to generate and inject a signal into the wireless-power transfer circuit at the nodes between the capacitors. The signal generation circuit includes a rejection filter tuned to an operating frequency of the wireless-power transfer coil.Type: GrantFiled: May 3, 2019Date of Patent: October 25, 2022Assignee: WiTricity CorporationInventors: Marcel Fischer, Mircea-Florian Vancu, Hans Peter Widmer, Prasanth Venugopal
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Patent number: 11046193Abstract: The present disclosure describes techniques for detecting foreign objects by detecting changes in an electrical characteristic of an array of sense elements for detection objects based on a current measurement approach. In some aspects, an apparatus for measuring changes in current for detecting objects is provided. The apparatus includes a plurality of sense circuits each comprising a sense coil, the plurality of sense circuits each electrically connected to a common output node. The apparatus further includes a driver circuit electrically connected to the plurality of sense circuits and configured to operate as a voltage source and selectively apply a voltage signal at an operating frequency to each of the plurality of sense circuits. The apparatus further includes a current measurement circuit electrically connected to the common output node. The current measurement circuit is configured to provide a measurement output proportional to an electrical current at the common output node.Type: GrantFiled: December 19, 2018Date of Patent: June 29, 2021Assignee: WiTricity CorporationInventors: Lukas Sieber, Hans Peter Widmer, Mircea-Florian Vancu, Andreas Daetwyler
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Publication number: 20200350816Abstract: Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning capacitors electrically coupled to the wireless-power transfer coil. The apparatus also includes a power converter circuit electrically coupled to the wireless-power transfer circuit. Additionally, the apparatus includes a signal generation circuit different from the power converter circuit and electrically coupled to one or more nodes between capacitors of the plurality of tuning capacitors. The signal generation circuit is configured to generate and inject a signal into the wireless-power transfer circuit at the nodes between the capacitors. The signal generation circuit includes a rejection filter tuned to an operating frequency of the wireless-power transfer coil.Type: ApplicationFiled: May 3, 2019Publication date: November 5, 2020Applicant: WiTricity CorporationInventors: Marcel Fischer, Mircea-Florian Vancu, Hans Peter Widmer, Prasanth Venugopal
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Publication number: 20190225099Abstract: The present disclosure describes techniques for detecting foreign objects by detecting changes in an electrical characteristic of an array of sense elements for detection objects based on a current measurement approach. In some aspects, an apparatus for measuring changes in current for detecting objects is provided. The apparatus includes a plurality of sense circuits each comprising a sense coil, the plurality of sense circuits each electrically connected to a common output node. The apparatus further includes a driver circuit electrically connected to the plurality of sense circuits and configured to operate as a voltage source and selectively apply a voltage signal at an operating frequency to each of the plurality of sense circuits. The apparatus further includes a current measurement circuit electrically connected to the common output node. The current measurement circuit is configured to provide a measurement output proportional to an electrical current at the common output node.Type: ApplicationFiled: December 19, 2018Publication date: July 25, 2019Inventors: Lukas SIEBER, Hans Peter WIDMER, Mircea-Florian VANCU, Andreas DAETWYLER