Patents by Inventor Stefan Strandberg
Stefan Strandberg 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: 20200042008Abstract: A method and a system for docking a robotic mower with a charging station, the system including a boundary wire and a charging station loop wherein the boundary wire makes a loop in the charging station that is narrower than and crosses the charging station loop. A return signal is received from a control unit commanding the robotic mower to return to the charging station. In response thereto, the robotic mower is controlled to follow the boundary wire until the charging station loop is detected. The robotic mower then follows the charging station loop until a crossing between the charging station loop and the boundary wire loop is detected. Thereafter, the robotic mower is controlled to follow the charging station loop a first distance, and then continuing to drive the robotic mower in a direction straight forward for a second distance.Type: ApplicationFiled: June 12, 2018Publication date: February 6, 2020Inventor: Stefan Strandberg
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Patent number: 10433448Abstract: Power electronics device, such as a frequency converter, comprising power units (REC1, INU1, INU2, CDC1), a metal frame (31) and a DC bus arrangement in which the power units are connected. The power units may be assembled inside the metal frame (31) wherein the shape of the metal frame is elongated with rectangular cross-sectional shape, consisting of a bottom part (33) and from that essentially vertical oriented side wall parts (32). The DC bus arrangement is arranged on top of the bottom part (33) of the metal frame (31) and separated by an insulator layer (S1) from the metal frame (31). The DC bus arrangement comprises a first DC bus current conductor (DC+) and a second DC bus current conductor (DC?) which are arranged apart from each other. The DC bus current conductors (DC+, DC?) have a flat shape in such a way that their thickness dimension is essentially shorter than their width dimension.Type: GrantFiled: April 26, 2016Date of Patent: October 1, 2019Assignee: Vacon OyInventors: Jukka Jaskari, Osmo Miettinen, Magnus Hortans, Stefan Strandberg
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Publication number: 20190081475Abstract: A method for a direct current (DC) power distribution arrangement and a direct current (DC) power distribution arrangement, comprising a plurality of DC power distribution subsystems. Each DC power distribution subsystem comprises an inverter unit (INU) configured to operate as a subsystem-specific circuit breaker for intercoupling/separating the DC power distribution subsystem to/from the rest of the DC power distribution arrangement.Type: ApplicationFiled: February 18, 2016Publication date: March 14, 2019Inventors: Stefan Strandberg, Risto Komulainen
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Patent number: 10123455Abstract: Arrangement for cooling, with liquid, one or more electrical devices or structural units of an electrical device that is/are in at least one installation enclosure. A main channeling includes two channels, for distributing the liquid to the electrical devices to be cooled or to the structural units of the electrical devices, a liquid container, which is connected to one of the main channels directly and to the other main channel via a suction channel a pump and a heat exchanger, and also a shut-off valve. The liquid container is disposed below the electrical devices to be cooled or their structural elements, and the amount of liquid to be contained in the arrangement is configured to be such the ends of both the suction channel and the return channel that are inside the liquid container are always situated below the liquid surface.Type: GrantFiled: April 3, 2014Date of Patent: November 6, 2018Assignee: VACON OYInventors: Jukka Jaskari, Osmo Miettinen, Stefan Strandberg
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Publication number: 20180098449Abstract: Power electronics device, such as a frequency converter, comprising power units (REC1, INU1, INU2, CDC1), a metal frame (31) and a DC bus arrangement in which the power units are connected. The power units may be assembled inside the metal frame (31) wherein the shape of the metal frame is elongated with rectangular cross-sectional shape, consisting of a bottom part (33) and from that essentially vertical oriented side wall parts (32). The DC bus arrangement is arranged on top of the bottom part (33) of the metal frame (31) and separated by an insulator layer (S1) from the metal frame (31). The DC bus arrangement comprises a first DC bus current conductor (DC+) and a second DC bus current conductor (DC?) which are arranged apart from each other. The DC bus current conductors (DC+, DC?) have a flat shape in such a way that their thickness dimension is essentially shorter than their width dimension.Type: ApplicationFiled: April 26, 2016Publication date: April 5, 2018Inventors: Jukka Jaskari, Osmo Miettinen, Magnus Hortans, Stefan Strandberg
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Publication number: 20170320215Abstract: A method of providing remote control of a robotic vehicle may include receiving an instruction directing setup of a connection for communication between a robotic vehicle and an electronic device configurable to interface with the robotic vehicle remotely, providing a pairing code to one of the robotic vehicle or the electronic device for display of the pairing code at the one of the robotic vehicle or the electronic device, receiving an indication of entry of the pairing code at the other of the robotic vehicle or the initiate pairing electronic device, establishing a communication link for operably coupling the robotic vehicle and the electronic device responsive to receipt of the indication, and enabling an operator to remotely interact with the robotic vehicle at the electronic device via the communication link.Type: ApplicationFiled: November 26, 2014Publication date: November 9, 2017Inventors: Stefan STRANDBERG, Maria KIHLBAUM, Philip AXELL, Andreas KALLMING
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Patent number: 9282677Abstract: Power electronics device, such as a frequency converter, which includes liquid-cooled power units (REC5, REC6, AFE5, AFE6, INU4, INU5, DC/DC, DC/AC) and also a substrate arrangement. The power units include at least one power semiconductor component, e.g. an IGBT or a diode, connected to at least one power circuit connecting them. The power units are mechanically separate and they are disposed on at least one substrate provided with liquid cooling ducts. The substrate is common to more than one power unit, wherein the substrate includes liquid cooling interfaces and power circuit interfaces for each power unit that can be connected to it. In addition, the substrate includes one liquid cooling interface and one power circuit interface (DC+, DC?) to outside the substrate.Type: GrantFiled: November 5, 2013Date of Patent: March 8, 2016Assignee: VACON OYJInventors: Osmo Miettinen, Jukka Jaskari, Stefan Strandberg, Trygve Björkgren, Hannu Sarén, Magnus Hortans
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Patent number: 8938318Abstract: The present invention relates to a method (300) and a system (100) for navigating a robotic garden tool (202) based on one or more operating parameters for subareas (210-218) within the working area (204) and a current location of the robotic garden tool (202). The working area (204) is provided with a signal source (104) corresponding to which a sensor unit (106) is provided in the robotic garden tool (202) for detecting the one or more signals (102) from the signal source (104). The robotic garden tool (202) may include a low-accuracy positioning device (110) for providing co-ordinates of various subareas (210-218) and at any given instant, an approximate location of the robotic garden tool (202). The robotic garden tool (202) further includes a processor means (114) for comparing the coordinates of the subareas (210-218) and the approximate position of the robotic garden tool (202) to determine a current location of the robotic garden tool (202) in the working area (204).Type: GrantFiled: March 17, 2011Date of Patent: January 20, 2015Assignee: Husqvarna ABInventors: Jonas Bergström, Stefan Strandberg, Patrik Jägenstedt, Mattias Kamfors
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Publication number: 20140305611Abstract: Arrangement for cooling, with liquid, one or more electrical devices or structural units of an electrical device that is/are in at least one installation enclosure. A main channeling includes two channels, for distributing the liquid to the electrical devices to be cooled or to the structural units of the electrical devices, a liquid container, which is connected to one of the main channels directly and to the other main channel via a suction channel a pump and a heat exchanger, and also a shut-off valve. The liquid container is disposed below the electrical devices to be cooled or their structural elements, and the amount of liquid to be contained in the arrangement is configured to be such the ends of both the suction channel and the return channel that are inside the liquid container are always situated below the liquid surface.Type: ApplicationFiled: April 3, 2014Publication date: October 16, 2014Applicant: VACON OYJInventors: Jukka JASKARI, Osmo MIETTINEN, Stefan STRANDBERG
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Publication number: 20140140005Abstract: Power electronics device, such as a frequency converter, which includes liquid-cooled power units (REC5, REC6, AFE5, AFE6, INU4, INU5, DC/DC, DC/AC) and also a substrate arrangement. The power units include at least one power semiconductor component, e.g. an IGBT or a diode, connected to at least one power circuit connecting them. The power units are mechanically separate and they are disposed on at least one substrate provided with liquid cooling ducts. The substrate is common to more than one power unit, wherein the substrate includes liquid cooling interfaces and power circuit interfaces for each power unit that can be connected to it. In addition, the substrate includes one liquid cooling interface and one power circuit interface (DC+, DC?) to outside the substrate.Type: ApplicationFiled: November 5, 2013Publication date: May 22, 2014Applicant: VACON OYJInventors: Osmo MIETTINEN, Jukka JASKARI, Stefan STRANDBERG, Trygve BJÖRKGREN, Hannu SARÉN, Magnus HORTANS
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Patent number: 8645087Abstract: Method and apparatus for measuring an earth fault current in an output circuit of an inverter (INU) operating on the PWM principle and forming alternating-current voltage from direct-current voltage, the output currents (iU, iV and iW) of which inverter are measured, and which inverter comprises at least two phase switches implemented with power semiconductor components (V1-V6, D1-D6), which switches, controlled by a control unit, connect their own output phases to a positive (+) pole and to a negative (?) pole of a direct-current voltage source such that the phase switches are repeatedly both in different positions and also in the same positions, wherein the results of current measurement during two opposite switch position combinations are recorded in memory, and the earth fault current is calculated by forming a difference of the measurement results of said combinations.Type: GrantFiled: April 18, 2011Date of Patent: February 4, 2014Assignee: Vacon OyjInventors: Andreas Doktar, Stefan Strandberg
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Patent number: 8577317Abstract: A broadcast receiver and a method for setting the broadcast receiver, comprising receiving a primary broadcast sent by a broadcast station and retrieving program associated data made available by said broadcast station. The method comprises a first channel, a primary broadcast channel BC, and a second channel, an interaction channel, for retrieving the program associated data (PAD) from the broadcast station, whereby a browser sends an HTTP or a WAP request using an Internet connection. The method comprises retrieving a uniform resource locator of the program associated data (PAD) as station associated data (SAD) from a station associated data site (SADS) the station associated data comprising program associated data relating to the primary broadcast, coverage information and frequency information of included broadcast stations and the broadcast receiver being capable of setting the browser and the broadcast receiver unit by suing this SAD information.Type: GrantFiled: June 29, 2012Date of Patent: November 5, 2013Assignee: Manor Research, L.L.C.Inventors: Stefan Strandberg, Johan Sjoblom
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Patent number: 8350506Abstract: Method and apparatus to start a frequency converter equipped with a direct current intermediate circuit, particularly when a permanent magnet motor whose rotor is rotating at the start-up time is connected to it, wherein the frequency converter has a network bridge (10) and load bridge (11), and the load bridge has controllable power semiconductor switches of the upper and lower branch (V1-V6) and parallel connected zero diodes (D1-D6), and a direct current intermediate circuit between them, and the said frequency converter uses a current transducer placed in the direct current intermediate circuit, and the analogue current signal composed by it features samples of the measured output currents, and the diverter switches of the frequency converter's upper branch are controlled using the bootstrap method, wherein start-up is initiated by controlling the controllable power semiconductor switch of the lower branch of at least one output phase to a conductive state for one or several periods of time, preferably ofType: GrantFiled: April 1, 2010Date of Patent: January 8, 2013Assignee: Vacon OyjInventors: Andreas Doktar, Stefan Strandberg, Jaakko Ollila
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Publication number: 20130006419Abstract: The present invention relates to a method (300) and a system (100) for navigating a robotic garden tool (202) based on one or more operating parameters for subareas (210-218) within the working area (204) and a current location of the robotic garden tool (202). The working area (204) is provided with a signal source (104) corresponding to which a sensor unit (106) is provided in the robotic garden tool (202) for detecting the one or more signals (102) from the signal source (104). The robotic garden tool (202) may include a low-accuracy positioning device (110) for providing co-ordinates of various subareas (210-218) and at any given instant, an approximate location of the robotic garden tool (202). The robotic garden tool (202) further includes a processor means (114) for comparing the coordinates of the subareas (210-218) and the approximate position of the robotic garden tool (202) to determine a current location of the robotic garden tool (202) in the working area (204).Type: ApplicationFiled: March 17, 2011Publication date: January 3, 2013Applicant: HUSQVARNA ABInventors: Jonas Bergström, Stefan Strandberg, Patrik Jägenstedt, Mattias Kamfors
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Publication number: 20120270495Abstract: A broadcast receiver and a method for setting the broadcast receiver, comprising receiving a primary broadcast sent by a broadcast station and retrieving program associated data made available by said broadcast station. The method comprises a first channel, a primary broadcast channel BC, and a second channel, an interaction channel, for retrieving the program associated data (PAD) from the broadcast station, whereby a browser sends an HTTP or a WAP request using an Internet connection. The method comprises retrieving a uniform resource locator of the program associated data (PAD) as station associated data (SAD) from a station associated data site (SADS) the station associated data comprising program associated data relating to the primary broadcast, coverage information and frequency information of included broadcast stations and the broadcast receiver being capable of setting the browser and the broadcast receiver unit by suing this SAD information.Type: ApplicationFiled: June 29, 2012Publication date: October 25, 2012Applicant: Manor Research, L.L.C.Inventors: Stefan Strandberg, Johan SJÖBLOM
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Patent number: 8254863Abstract: A broadcast receiver and a method for setting the broadcast receiver, comprising receiving a primary broadcast sent by a broadcast station and retrieving program associated data made available by said broadcast station. The method comprises a first channel, a primary broadcast channel BC, and a second channel, an interaction channel, for retrieving the program associated data (PAD) from the broadcast station, whereby a browser sends an HTTP or a WAP request using an Internet connection. The method comprises retrieving a uniform resource locator of the program associated data (PAD) as station associated data (SAD) from a station associated data site (SADS) the station associated data comprising program associated data relating to the primary broadcast, coverage information and frequency information of included broadcast stations and the broadcast receiver being capable of setting the browser and the broadcast receiver unit by suing this SAD information.Type: GrantFiled: March 27, 2003Date of Patent: August 28, 2012Assignee: Manor Research, L.L.C.Inventors: Stefan Strandberg, Johan Sjöblom
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Patent number: 8242719Abstract: Method and arrangement for connecting an AC electric motor (M1, M2, . . . MN) to an AC electricity network (L) in a system which comprises a frequency converter (FC), with which the motor is started, and contactors (S11, S12, S21, S22, SN1, SN2), in which method the supply source is changed by means of the contactors from the frequency converter to a direct network supply, in which method the frequency converter is stopped before changing the supply source, and in which method in connection with changing the supply source the control of the contactors is started before stopping the frequency converter.Type: GrantFiled: February 27, 2009Date of Patent: August 14, 2012Assignee: Vacon OyjInventors: Shekhar Kubal, Stefan Strandberg, Ahti Rauma
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Publication number: 20110270545Abstract: Method and apparatus for measuring an earth fault current in an output circuit of an inverter (INU) operating on the PWM principle and forming alternating-current voltage from direct-current voltage, the output currents (iU, iV and iW) of which inverter are measured, and which inverter comprises at least two phase switches implemented with power semiconductor components (V1-V6, D1-D6), which switches, controlled by a control unit, connect their own output phases to a positive (+) pole and to a negative (?) pole of a direct-current voltage source such that the phase switches are repeatedly both in different positions and also in the same positions, wherein the results of current measurement during two opposite switch position combinations are recorded in memory, and the earth fault current is calculated by forming a difference of the measurement results of said combinations.Type: ApplicationFiled: April 18, 2011Publication date: November 3, 2011Applicant: VACON OYJInventors: Andreas DOKTAR, Stefan STRANDBERG
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Patent number: D789160Type: GrantFiled: September 10, 2015Date of Patent: June 13, 2017Assignee: BabyBjörn ABInventors: Stefan Strandberg, Håkan Bergkvist
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Patent number: D882411Type: GrantFiled: October 26, 2018Date of Patent: April 28, 2020Assignee: TETRA LAVAL HOLDINGS & FINANCE S.A.Inventors: Kristian Jacobsson, Frida Åberg, Stefan Strandberg, Nicola Chamberlain