Patents by Inventor Stefan Jon Kristjansson
Stefan Jon Kristjansson 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: 11841754Abstract: An electronic device supplies power to system load(s) from a first battery power source and a second battery power source connected in series across a re-configurable device section boundary. A battery monitor monitors voltage across each individual battery cell within the first and second battery power sources. The battery monitor directs a charge circuit as to how and when to charge the first and second battery power sources using an external power source. The battery monitor also directs the charge circuit as to how and when to use the first and second battery power sources to power the system load(s).Type: GrantFiled: June 12, 2019Date of Patent: December 12, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Jay Allen Kuehny, Sachin Ramesh Chandra, Yen Ying Lee, Gene R. Obie, Jason Michael Battle
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Publication number: 20230336033Abstract: A device for inductively charging an electronic accessory includes a first portion, a second portion, and a spacer. The first portion includes a first transmission coil in a first plane where the first transmission coil is configured to generate a first magnetic field, and the second portion includes a first transmission coil in a second plane where the second transmission coil is configured to generate a second magnetic field. The spacer is positioned between the first transmission coil and the second transmission coil and between the first plane and the second plane. The spacer material magnetically insulates the second transmission coil from the first magnetic field.Type: ApplicationFiled: June 23, 2023Publication date: October 19, 2023Inventors: Casey Sean CALLAN, Stefan Jon KRISTJANSSON, Daniel Thomas NEVISTIC, George KARAVAEV, Michael Francis DEILY, David William VOTH, Srinivas Reddy NAGAMPET
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Patent number: 11742690Abstract: The described technology provides a method of balancing power supplied to a system load by a first battery power source and a second battery power source. The method includes sensing a first current supplied by or supplied to the first battery source. The method further includes changing a control voltage for a voltage converter circuit based on the sensed first current, an input of the voltage converter circuit being coupled to the second battery power source, an output of the voltage converter circuit being electrically coupled to the system load. The method still further includes adjusting the voltage converter circuit to modify a charge current supplied from the second battery power source to the first battery power source based on the control voltage.Type: GrantFiled: April 16, 2021Date of Patent: August 29, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Yen Ying Lee, Gene R. Obie
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Patent number: 11728687Abstract: A device for inductively charging an electronic accessory includes a first portion, a second portion, and a spacer. The first portion includes a first transmission coil in a first plane where the first transmission coil is configured to generate a first magnetic field, and the second portion includes a first transmission coil in a second plane where the second transmission coil is configured to generate a second magnetic field. The spacer is positioned between the first transmission coil and the second transmission coil and between the first plane and the second plane. The spacer material magnetically insulates the second transmission coil from the first magnetic field.Type: GrantFiled: August 12, 2019Date of Patent: August 15, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Casey Sean Callan, Stefan Jon Kristjansson, Daniel Thomas Nevistic, George Karavaev, Michael Francis Deily, David William Voth, Srinivas Reddy Nagampet
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Patent number: 11368038Abstract: A charging receiver device adapts wireless charging receiver loading. The charging receiver device receives energy wirelessly transferred from a wireless charging coil of a charging transmitter device. The charging receiver device includes a charger circuit electrically coupled to a wireless charging receiver coil to receive the charging power. The charging power is a function of a rectified receiver voltage at the charger circuit. A received power monitoring circuit monitors the rectified receiver voltage at the charger circuit, detects a deviation of the monitored rectified receiver voltage from a target rectified receiver voltage for the charging receiver device, and decreases a charge current output from the charger circuit to increase the rectified receiver voltage toward the target rectified receiver voltage, responsive to determining that the detected deviation indicates that the monitored rectified receiver voltage is less than the target rectified receiver voltage.Type: GrantFiled: August 6, 2019Date of Patent: June 21, 2022Assignee: Microsoft Technology Licensing, LLCInventor: Stefan Jon Kristjansson
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Patent number: 11165265Abstract: An electronic device balances power supplied to a system load by a first battery power source and a second battery power source. A battery current sense circuit is electrically coupled to sense a first current supplied by the first battery power source to the system load. A discharge feedback controller is electrically coupled to the battery current sense circuit and configured to adjust a control voltage based on the sensed first current. A voltage converter circuit includes an input electrically coupled to the second battery power source and an output electrically coupled to the system load. The voltage converter circuit is configured to adjust current supplied by the second battery power source through the voltage converter circuit to the system load based on the control voltage.Type: GrantFiled: June 28, 2019Date of Patent: November 2, 2021Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Yen Ying Lee, Gene R. Obie
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Patent number: 11101680Abstract: An electronic device adjusts power supplied to a first battery power source by a second battery power source. A battery current sense circuit senses a charge current supplied to the first battery power source. Operation of a tracking circuit depends on the charge current. A charge feedback controller generates a control voltage based on an output voltage at a first battery port of the first battery power source. A voltage converter circuit includes an input port electrically coupled to the second battery power source and an output port electrically coupled to the tracking circuit and the first battery power source. The voltage converter circuit adjusts the charge current supplied by the second battery power source through the voltage converter circuit to the first power source based on the control voltage.Type: GrantFiled: June 28, 2019Date of Patent: August 24, 2021Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Yen Ying Lee, Gene R. Obie
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Publication number: 20210234391Abstract: The described technology provides a method of balancing power supplied to a system load by a first battery power source and a second battery power source. The method includes sensing a first current supplied by or supplied to the first battery source. The method further includes changing a control voltage for a voltage converter circuit based on the sensed first current, an input of the voltage converter circuit being coupled to the second battery power source, an output of the voltage converter circuit being electrically coupled to the system load. The method still further includes adjusting the voltage converter circuit to modify a charge current supplied from the second battery power source to the first battery power source based on the control voltage.Type: ApplicationFiled: April 16, 2021Publication date: July 29, 2021Inventors: Stefan Jon KRISTJANSSON, Yen Ying LEE, Gene R. OBIE
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Patent number: 11038364Abstract: The herein described technology provides a device with at least two batteries having disparate charge characteristics connected in parallel and sharing a single charging node. The device further includes an adjustable resistance in a charge path between the single charging node and a first battery of the two disparate batteries, and charge control circuitry that dynamically determines a charge rate for the first battery based on a detected battery parameter and controls the adjustable resistance to charge the first battery at the determined charge rate.Type: GrantFiled: January 10, 2018Date of Patent: June 15, 2021Assignee: Microsoft Technology Licensing, LLCInventor: Stefan Jon Kristjansson
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Patent number: 10944274Abstract: The present disclosure relates to apparatuses and methods of providing an ideal diode function to a battery having a protective field effect transistor (FET). An apparatus may include the protective FET configured to selectively connect an external voltage to a battery for charging the battery. The apparatus may also include a controller coupled with a gate of the protective FET via a node and configured to enable the protective FET. The apparatus may further include an override circuit coupled to the node and configured to selectively draw current away from the gate of the protective FET based on the external voltage or to interrupt the path from a controller to a protective FET. The override circuit of the apparatus may provide protection from cross-charging of the battery by a second battery while using the protective FET that is already used for charge/discharge protection.Type: GrantFiled: January 19, 2018Date of Patent: March 9, 2021Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Algird Michael Gudaitis
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Publication number: 20210050742Abstract: A device for inductively charging an electronic accessory includes a first portion, a second portion, and a spacer. The first portion includes a first transmission coil in a first plane where the first transmission coil is configured to generate a first magnetic field, and the second portion includes a first transmission coil in a second plane where the second transmission coil is configured to generate a second magnetic field. The spacer is positioned between the first transmission coil and the second transmission coil and between the first plane and the second plane. The spacer material magnetically insulates the second transmission coil from the first magnetic field.Type: ApplicationFiled: August 12, 2019Publication date: February 18, 2021Inventors: Casey Sean CALLAN, Stefan Jon KRISTJANSSON, Daniel Thomas NEVISTIC, George KARAVAEV, Michael Francis DEILY, David William VOTH, Srinivas Reddy NAGAMPET
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Publication number: 20210044132Abstract: A charging receiver device adapts wireless charging receiver loading. The charging receiver device receives energy wirelessly transferred from a wireless charging coil of a charging transmitter device. The charging receiver device includes a charger circuit electrically coupled to a wireless charging receiver coil to receive the charging power. The charging power is a function of a rectified receiver voltage at the charger circuit. A received power monitoring circuit monitors the rectified receiver voltage at the charger circuit, detects a deviation of the monitored rectified receiver voltage from a target rectified receiver voltage for the charging receiver device, and decreases a charge current output from the charger circuit to increase the rectified receiver voltage toward the target rectified receiver voltage, responsive to determining that the detected deviation indicates that the monitored rectified receiver voltage is less than the target rectified receiver voltage.Type: ApplicationFiled: August 6, 2019Publication date: February 11, 2021Inventor: Stefan Jon Kristjansson
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Publication number: 20200412136Abstract: An electronic device balances power supplied to a system load by a first battery power source and a second battery power source. A battery current sense circuit is electrically coupled to sense a first current supplied by the first battery power source to the system load. A discharge feedback controller is electrically coupled to the battery current sense circuit and configured to adjust a control voltage based on the sensed first current. A voltage converter circuit includes an input electrically coupled to the second battery power source and an output electrically coupled to the system load. The voltage converter circuit is configured to adjust current supplied by the second battery power source through the voltage converter circuit to the system load based on the control voltage.Type: ApplicationFiled: June 28, 2019Publication date: December 31, 2020Inventors: Stefan Jon KRISTJANSSON, Yen Ying LEE, Gene R. OBIE
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Publication number: 20200412132Abstract: An electronic device adjusts power supplied to a first battery power source by a second battery power source. A battery current sense circuit senses a charge current supplied to the first battery power source. Operation of a tracking circuit depends on the charge current. A charge feedback controller generates a control voltage based on an output voltage at a first battery port of the first battery power source. A voltage converter circuit includes an input port electrically coupled to the second battery power source and an output port electrically coupled to the tracking circuit and the first battery power source. The voltage converter circuit adjusts the charge current supplied by the second battery power source through the voltage converter circuit to the first power source based on the control voltage.Type: ApplicationFiled: June 28, 2019Publication date: December 31, 2020Inventors: Stefan Jon KRISTJANSSON, Yen Ying LEE, Gene R. OBIE
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Publication number: 20200395765Abstract: An electronic device supplies power to system load(s) from a first battery power source and a second battery power source connected in series across a re-configurable device section boundary. A battery monitor monitors voltage across each individual battery cell within the first and second battery power sources. The battery monitor directs a charge circuit as to how and when to charge the first and second battery power sources using an external power source. The battery monitor also directs the charge circuit as to how and when to use the first and second battery power sources to power the system load(s).Type: ApplicationFiled: June 12, 2019Publication date: December 17, 2020Inventors: Stefan Jon KRISTJANSSON, Jay Allen KUEHNY, Sachin Ramesh CHANDRA, Yen Ying LEE, Gene R. OBIE, Jason Michael BATTLE
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Patent number: 10840724Abstract: The herein described technology provides a device with at least two batteries having disparate charge characteristics connected in parallel and sharing a single charging node. The device further includes an adjustable resistance in a charge path between the single charging node and a first battery of the two disparate batteries, and charge control circuitry that dynamically determines a charge rate for the first battery based on a detected battery parameter and controls the adjustable resistance to charge the first battery at the determined charge rate.Type: GrantFiled: January 10, 2018Date of Patent: November 17, 2020Assignee: Microsoft Technology Licensing, LLCInventor: Stefan Jon Kristjansson
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Patent number: 10778013Abstract: The herein described technology provides a system with multiple batteries connected in parallel and having disparate charge and/or discharge characteristics. When a voltage source is coupled to a shared charging node, the multiple batteries are simultaneously charged through the shared charging node.Type: GrantFiled: January 10, 2018Date of Patent: September 15, 2020Assignee: Microsoft Technology Licensing, LLCInventors: Stefan Jon Kristjansson, Algird M. Gudatis, Laurentiu Olariu
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Publication number: 20190229543Abstract: The present disclosure relates to apparatuses and methods of providing an ideal diode function to a battery having a protective field effect transistor (FET). An apparatus may include the protective FET configured to selectively connect an external voltage to a battery for charging the battery. The apparatus may also include a controller coupled with a gate of the protective FET via a node and configured to enable the protective FET. The apparatus may further include an override circuit coupled to the node and configured to selectively draw current away from the gate of the protective FET based on the external voltage or to interrupt the path from a controller to a protective FET. The override circuit of the apparatus may provide protection from cross-charging of the battery by a second battery while using the protective FET that is already used for charge/discharge protection.Type: ApplicationFiled: January 19, 2018Publication date: July 25, 2019Inventors: Stefan Jon KRISTJANSSON, Algird Michael GUDAITIS
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Publication number: 20190214837Abstract: The herein described technology provides a device with at least two batteries having disparate charge characteristics connected in parallel and sharing a single charging node. The device further includes an adjustable resistance in a charge path between the single charging node and a first battery of the two disparate batteries, and charge control circuitry that dynamically determines a charge rate for the first battery based on a detected battery parameter and controls the adjustable resistance to charge the first battery at the determined charge rate.Type: ApplicationFiled: January 10, 2018Publication date: July 11, 2019Inventor: Stefan Jon KRISTJANSSON
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Publication number: 20190214831Abstract: The herein described technology provides a system with multiple batteries connected in parallel and having disparate charge and/or discharge characteristics. When a voltage source is coupled to a shared charging node, the multiple batteries are simultaneously charged through the shared charging node.Type: ApplicationFiled: January 10, 2018Publication date: July 11, 2019Inventors: Stefan Jon KRISTJANSSON, Algird M. GUDAITIS, Laurentiu OLARIU