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Wireless charging system with receiver locating circuitry and foreign object detection

A technology of foreign objects and receiving coils, applied in transmission systems, circuit devices, near-field transmission systems, etc., can solve the problems of difficulty in detecting whether there are foreign objects on the wireless charging surface, and difficulty in identifying portable electronic devices.

Active Publication Date: 2019-09-27
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in a wireless charging system having a wireless charging surface with an array of wireless power transfer coils, it can be difficult to determine which coils to use to efficiently transfer wireless power to a portable electronic device
It can also be difficult to detect the presence of foreign objects on the wireless charging surface

Method used

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  • Wireless charging system with receiver locating circuitry and foreign object detection
  • Wireless charging system with receiver locating circuitry and foreign object detection
  • Wireless charging system with receiver locating circuitry and foreign object detection

Examples

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Embodiment approach

[0095] According to another embodiment, the inductance measurement circuit includes an impulse response measurement circuit.

[0096] According to another embodiment, the control circuit is configured to measure an inductance value of each of the wireless power transmission coils to determine whether any foreign object overlaps the wireless power receiving coil in the wireless power receiving device.

[0097] According to another embodiment, the control circuit is further configured to control the transmission of the wireless power signal by selecting a given coil of the array of wireless power transmission coils to transmit the wireless power signal based at least in part on the measured inductance value.

[0098] According to another embodiment, the control circuit is configured to communicate with the wireless power receiving device on the array of wireless power transmitting coils in the absence of foreign objects by comparing only those measured inductance values ​​that di...

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Abstract

A wireless power transmission system has a wireless power receiving device that is located on a charging surface of a wireless power transmitting device. The wireless power receiving device has a wireless power receiving coil and the wireless power transmitting device has a wireless power transmitting coil array. Control circuitry in the transmitting device uses inverter circuitry to supply alternating-current signals to coils in the coil array, thereby transmitting wireless power signals. Impulse response measurement circuitry coupled to the coil array is used to make impulse response measurements while the control circuitry uses the inverter circuitry to apply impulse signals to each of the coils. The control circuitry analyzes output from the impulse response measurement circuitry to measure inductances associated with the coils in the coil array.

Description

[0001] This application claims U.S. Nonprovisional Patent Application 15 / 690,121, filed August 29, 2017, U.S. Provisional Patent Application 62 / 457,743, filed February 10, 2017, and U.S. Provisional Patent Application, filed February 2, 2017 Priority to application 62 / 453,859, which patent applications are hereby incorporated by reference in their entirety. technical field [0002] The present invention relates generally to wireless systems, and more particularly to systems in which devices are wirelessly charged. Background technique [0003] In a wireless charging system, a wireless power transfer device, such as a device having a charging surface, wirelessly transfers power to a portable electronic device. The portable electronic device receives the wirelessly transmitted power and uses the power to charge an internal battery or power components in the portable electronic device. [0004] Regulating wireless power flow in wireless charging systems can be challenging. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26H02J50/60
CPCH02J50/12H02J50/60H02J50/90H04B5/79H04B5/24
Inventor 杨恒裘卫红Z·穆萨欧
Owner APPLE INC
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