公开(公告)号：US11527920B2

公开(公告)日：2022-12-13

申请号：US16403419

申请日：2019-05-03

Applicant: Integrated Device Technology, Inc.

Inventor： Gustavo James Mehas ,  Amit D. Bavisi ,  Nicholaus Wayne Smith

IPC: H02J50/60 ,  H02J7/02 ,  H02J50/12 ,  G01V3/10

Abstract: 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.

公开(公告)号：US11005298B2

公开(公告)日：2021-05-11

申请号：US16388476

申请日：2019-04-18

Applicant: Integrated Device Technology, Inc.

Inventor： Nicholaus Smith ,  Rui Liu ,  Amit D. Bavisi ,  Jiangjian Huang ,  Gabriel Aungurencei

IPC: H02J50/12 ,  H02J50/80 ,  H02J7/02

Abstract: 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.

公开(公告)号：US10938255B2

公开(公告)日：2021-03-02

申请号：US16368777

申请日：2019-03-28

Applicant: Integrated Device Technology, Inc.

Inventor： Nicholaus Smith ,  Rui Liu ,  Tao Qi ,  Amit D. Bavisi ,  Chan Young Jeong

IPC: H02J50/90 ,  H02J50/10 ,  H03K17/955 ,  H02J7/02 ,  H02J50/40

Abstract: 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.

公开(公告)号：US11005306B2

公开(公告)日：2021-05-11

申请号：US16368790

申请日：2019-03-28

Applicant: Integrated Device Technology, Inc.

Inventor： Tao Qi ,  Gustavo Mehas ,  Chan Young Jeong ,  Xinyun Gu ,  Nicholaus Smith ,  Amit D. Bavisi ,  Daryl Sugasawara ,  Aihua Lee

IPC: H02J50/70 ,  H02J7/02 ,  H02J50/10

Abstract: 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.

公开(公告)号：US10784044B2

公开(公告)日：2020-09-22

申请号：US16376955

申请日：2019-04-05

Applicant: Integrated Device Technology, Inc.

Inventor： Tao Qi ,  Gustavo Mehas ,  Chan Young Jeong ,  Xinyun Gu ,  Nicholaus Wayne Smith ,  Amit D. Bavisi ,  Daryl Jay Sugasawara ,  Aihua Lee ,  Tianze Kan

IPC: H01F38/14 ,  H01F27/28 ,  H01F27/00 ,  H01F5/00 ,  H02J50/10 ,  H01F27/29

Abstract: 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.

公开(公告)号：US11418067B2

公开(公告)日：2022-08-16

申请号：US16586212

申请日：2019-09-27

Applicant: Integrated Device Technology, Inc.

Inventor： Gustavo James Mehas ,  Amit D. Bavisi ,  Nicholaus Wayne Smith

IPC: H02J50/60 ,  H02J50/12 ,  H02J50/40 ,  G01V3/10

Abstract: 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.

公开(公告)号：US11240942B2

公开(公告)日：2022-02-01

申请号：US16385813

申请日：2019-04-16

Applicant: Integrated Device Technology, Inc.

Inventor： Nicholaus Wayne Smith ,  Tao Qi ,  Amit D. Bavisi ,  Changjae Kim

IPC: H05K7/20 ,  H02J7/02 ,  H02J7/00 ,  H02J50/10 ,  H01F38/14 ,  H02J50/90 ,  H02J50/60

Abstract: 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.

公开(公告)号：US20200169123A1

公开(公告)日：2020-05-28

申请号：US16403419

申请日：2019-05-03

Applicant: Integrated Device Technology, Inc.

Inventor： Gustavo James Mehas ,  Amit D. Bavisi ,  Nicholaus Wayne Smith

IPC: H02J50/60 ,  H02J50/12 ,  H02J7/02 ,  G01V3/10

Abstract: 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.