Patents by Inventor Amit D. Bavisi
Amit D. Bavisi 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: 11527920Abstract: Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.Type: GrantFiled: May 3, 2019Date of Patent: December 13, 2022Assignee: Integrated Device Technology, Inc.Inventors: Gustavo James Mehas, Amit D. Bavisi, Nicholaus Wayne Smith
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Patent number: 11418067Abstract: Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.Type: GrantFiled: September 27, 2019Date of Patent: August 16, 2022Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.Inventors: Gustavo James Mehas, Amit D. Bavisi, Nicholaus Wayne Smith
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Patent number: 11240942Abstract: In accordance with some embodiments of the present invention, an ion cooling engine (ICE) controlled by a transmitting or receiving device cools a transmit or receive coil and possibly other parts of a wireless power transmitter or receiver system. In some embodiments, the ICE includes a low-voltage circuit controlled by the transmitting device and coupled to a high voltage circuit that generates the airflow. Other features are also provided.Type: GrantFiled: April 16, 2019Date of Patent: February 1, 2022Assignee: Integrated Device Technology, Inc.Inventors: Nicholaus Wayne Smith, Tao Qi, Amit D. Bavisi, Changjae Kim
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Patent number: 11005298Abstract: In a wireless power transfer operation, the operating parameters are adjusted to improve efficiency by reducing the transmit and receive coil currents as follows. First, the transmitter causes the receiver to reduce the receive coil current to the lowest value based on the transmitter/receiver communication while still delivering the same amount of power to the load as before the AC current was adjusted to the minimum value. Then the transmitter may change the operating parameters to increase or preserve the power provided to the receiver without decreasing efficiency or with only small decrease in efficiency, or with increasing the efficiency. For example, the transmitter may increase the VBRG voltage (the DC voltage powering the transmit coil) or the operating frequency to maintain or increase output power levels at lower or the same AC and DC current levels. Other features are also provided.Type: GrantFiled: April 18, 2019Date of Patent: May 11, 2021Assignee: Integrated Device Technology, Inc.Inventors: Nicholaus Smith, Rui Liu, Amit D. Bavisi, Jiangjian Huang, Gabriel Aungurencei
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Patent number: 11005306Abstract: Embodiments described herein provide a wireless power transmitter that dynamically adjusts the deadtime to reduce power loss. Specifically, the wireless power transmitter includes a transistor circuit for switching a first voltage at a first node and a second voltage at a second node, and a LC circuit coupled between the first node and the second node. The wireless power transmitter further includes a controller coupled to the transistor circuit. The controller is configured to determine whether either of the first voltage and the second voltage is negative during a deadtime of switching. The controller is configured to increment or decrement the deadtime by an adjustment amount depending on whether negative voltage is detected.Type: GrantFiled: March 28, 2019Date of Patent: May 11, 2021Assignee: Integrated Device Technology, Inc.Inventors: Tao Qi, Gustavo Mehas, Chan Young Jeong, Xinyun Gu, Nicholaus Smith, Amit D. Bavisi, Daryl Sugasawara, Aihua Lee
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Patent number: 10938255Abstract: A capacitor sensor array (or grid) over a wireless power transmission coil can include a first set of lines; a second set of lines intersecting the first set of lines; a first multiplexer coupled to provide a charge (e.g. in the form of a DC voltage) from a voltage source to the first set of lines and provide first signals to detect voltages on each line; and a second multiplexer coupled to provide a charge from the voltage source to the second set of lines and provide second signals to detect voltages on each line, wherein an object positioned with respect to the first set of lines and the second set of lines is located. According to some embodiments, a wireless power receive coil and a rectifier circuit can be used in forming a capacitor sensor, to sense the capacitance between the receive and transmit coils for better alignment between the two coils. Other embodiments are also provided.Type: GrantFiled: March 28, 2019Date of Patent: March 2, 2021Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.Inventors: Nicholaus Smith, Rui Liu, Tao Qi, Amit D. Bavisi, Chan Young Jeong
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Patent number: 10784044Abstract: In accordance with embodiments of the present invention, a coil design for the transmission of wireless power. In some embodiments, the coil can include a winding with one or more turns of conductive traces mounted on a substrate, wherein the one or more turns include characteristics that enhance operation of the coil. In some embodiments, the winding includes a transmit coil and a receive coil, each coupled to terminals that provide for a transmit functionality and a receive functionality. In some embodiments, the traces are varied in width and/or thickness in order to optimize the inductance and the coil resistance. In some embodiments, parameters of a control circuit coupled to the coil to affect a transmit functionality or a receive functionality can be optimized.Type: GrantFiled: April 5, 2019Date of Patent: September 22, 2020Assignee: Integrated Device Technology, Inc.Inventors: Tao Qi, Gustavo Mehas, Chan Young Jeong, Xinyun Gu, Nicholaus Wayne Smith, Amit D. Bavisi, Daryl Jay Sugasawara, Aihua Lee, Tianze Kan
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Publication number: 20200212729Abstract: A capacitor sensor array (or grid) over a wireless power transmission coil can include a first set of lines; a second set of lines intersecting the first set of lines; a first multiplexer coupled to provide a charge (e.g. in the form of a DC voltage) from a voltage source to the first set of lines and provide first signals to detect voltages on each line; and a second multiplexer coupled to provide a charge from the voltage source to the second set of lines and provide second signals to detect voltages on each line, wherein an object positioned with respect to the first set of lines and the second set of lines is located. According to some embodiments, a wireless power receive coil and a rectifier circuit can be used in forming a capacitor sensor, to sense the capacitance between the receive and transmit coils for better alignment between the two coils. Other embodiments are also provided.Type: ApplicationFiled: March 28, 2019Publication date: July 2, 2020Inventors: Nicholaus SMITH, Rui LIU, Tao QI, Amit D. BAVISI, Chan Young JEONG
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Publication number: 20200204007Abstract: Embodiments described herein provide a wireless power transmitter that dynamically adjusts the deadtime to reduce power loss. Specifically, the wireless power transmitter includes a transistor circuit for switching a first voltage at a first node and a second voltage at a second node, and a LC circuit coupled between the first node and the second node. The wireless power transmitter further includes a controller coupled to the transistor circuit. The controller is configured to determine whether either of the first voltage and the second voltage is negative during a deadtime of switching. The controller is configured to increment or decrement the deadtime by an adjustment amount depending on whether negative voltage is detected.Type: ApplicationFiled: March 28, 2019Publication date: June 25, 2020Inventors: Tao QI, Gustavo MEHAS, Chan Young JEONG, Xinyun GU, Nicholaus SMITH, Amit D. BAVISI, Daryl SUGASAWARA, Aihua LEE
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Publication number: 20200169124Abstract: Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.Type: ApplicationFiled: September 27, 2019Publication date: May 28, 2020Inventors: Gustavo James MEHAS, Amit D. BAVISI, Nicholaus Wayne SMITH
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Publication number: 20200169123Abstract: Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.Type: ApplicationFiled: May 3, 2019Publication date: May 28, 2020Inventors: Gustavo James Mehas, Amit D. Bavisi, Nicholaus Wayne Smith
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Publication number: 20200076235Abstract: In a wireless power transfer operation, the operating parameters are adjusted to improve efficiency by reducing the transmit and receive coil currents as follows. First, the transmitter causes the receiver to reduce the receive coil current to the lowest value based on the transmitter/receiver communication while still delivering the same amount of power to the load as before the AC current was adjusted to the minimum value. Then the transmitter may change the operating parameters to increase or preserve the power provided to the receiver without decreasing efficiency or with only small decrease in efficiency, or with increasing the efficiency. For example, the transmitter may increase the VBRG voltage (the DC voltage powering the transmit coil) or the operating frequency to maintain or increase output power levels at lower or the same AC and DC current levels. Other features are also provided.Type: ApplicationFiled: April 18, 2019Publication date: March 5, 2020Inventors: Nicholaus SMITH, Rui LIU, Amit D. BAVISI, Jiangjian HUANG, Gabriel AUNGURENCEI
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Publication number: 20190394906Abstract: In accordance with some embodiments of the present invention, an ion cooling engine (ICE) controlled by a transmitting or receiving device cools a transmit or receive coil and possibly other parts of a wireless power transmitter or receiver system. In some embodiments, the ICE includes a low-voltage circuit controlled by the transmitting device and coupled to a high voltage circuit that generates the airflow. Other features are also provided.Type: ApplicationFiled: April 16, 2019Publication date: December 26, 2019Inventors: Nicholaus Wayne SMITH, Tao QI, Amit D. BAVISI, Changjae KIM
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Publication number: 20190386513Abstract: A wireless power transmitter and a receiver device can communicate through a bi-directional communications channel that uses the wireless power signal transmitted from the transmitter to the receiver.Type: ApplicationFiled: April 15, 2019Publication date: December 19, 2019Inventors: Amit D. BAVISI, Gopinath AKKINEPALLY, Aihua LEE, Tao QI, Christopher STEPHENS, Gustavo MEHAS, Nicholaus SMITH, Chan Young JEONG, Changjae KIM, Hojun SHIN
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Publication number: 20190334391Abstract: In accordance with embodiments of the present invention, a coil design for the transmission of wireless power. In some embodiments, the coil can include a winding with one or more turns of conductive traces mounted on a substrate, wherein the one or more turns include characteristics that enhance operation of the coil. In some embodiments, the winding includes a transmit coil and a receive coil, each coupled to terminals that provide for a transmit functionality and a receive functionality. In some embodiments, the traces are varied in width and/or thickness in order to optimize the inductance and the coil resistance. In some embodiments, parameters of a control circuit coupled to the coil to affect a transmit functionality or a receive functionality can be optimized.Type: ApplicationFiled: April 5, 2019Publication date: October 31, 2019Inventors: Tao QI, Gustavo MEHAS, Chan Young JEONG, Xinyun GU, Nicholaus Wayne SMITH, Amit D. BAVISI, Daryl Jay SUGASAWARA, Aihua LEE, Tianze KAN
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Patent number: 8068795Abstract: A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.Type: GrantFiled: March 24, 2009Date of Patent: November 29, 2011Assignee: Freescale Semiconductor, Inc.Inventors: Amit D. Bavisi, Walter J. Grandfield, Darioush Keyvani, Mark A. Kirschenmann
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Publication number: 20100248660Abstract: A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.Type: ApplicationFiled: March 24, 2009Publication date: September 30, 2010Inventors: Amit D. Bavisi, Walter J. Grandfield, Darioush Keyvani, Mark A. Kirschenmann