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CN-122001104-A - Power circuit device

CN122001104ACN 122001104 ACN122001104 ACN 122001104ACN-122001104-A

Abstract

An apparatus comprising a power transmitting device including an antenna, power circuitry configured to provide power via the antenna for wireless charging of a power receiving device, and a processor configured to analyze at least signals from the antenna to determine the presence of the power receiving device proximate the power transmitting device and to determine the presence of foreign matter FO proximate the power transmitting device. Wherein the processor is configured to control the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device based on one or both of the analysis of the signal and the power provided by the power circuitry indicating that the power transmitting device is proximate to a foreign object. In response to the analysis of the signal indicating that a FO removal event has occurred, the processor is configured to control the power circuitry to provide power for wireless charging of the power receiving device.

Inventors

  • CHETAN VERMA
  • Markus Obak

Assignees

  • 恩智浦有限公司

Dates

Publication Date
20260508
Application Date
20251029
Priority Date
20241107

Claims (10)

  1. 1. An apparatus, comprising: A power transmitting device, comprising: The antenna is arranged to be connected to the antenna, Power circuitry configured to provide power via the antenna for wireless charging of a power receiving device, and A processor configured to analyze at least signals from the antenna to determine the presence of the power receiving device in proximity to the power transmitting device and to determine the presence of foreign matter FO in proximity to the power transmitting device, and Wherein the processor is configured to: Controlling the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device based on one or both of the analysis of the signal and the power provided by the power circuitry indicating that the power transmitting device is proximate to a foreign object, and In response to the analysis of the signal indicating that a FO removal event has occurred, wherein the FO removal event includes the FO no longer being proximate to the power transmitting device and the power receiving device remaining proximate to the power transmitting device, the power circuitry is controlled to provide power for wireless charging of the power receiving device.
  2. 2. The apparatus of claim 1, wherein the analysis of the signal indicates that the power transmitting device is proximate to the foreign object is determined by the processor being configured to one or both of: determining a reduction in efficiency of power transmission between the power transmitting device and the power receiving device based on information indicative of the power received by the power receiving device and information indicative of the power provided by the power circuitry in the signal from the antenna, and A rate of change of the power provided by the power circuitry for wireless charging of the power receiving device above a threshold is determined.
  3. 3. The apparatus of claim 1 or claim 2, wherein the processor is configured to control the power circuitry to provide power for wireless charging of the power receiving device based on the analysis of the signal indicating that the power transmitting device is proximate to the power receiving device and that no FO is proximate to the power receiving device.
  4. 4. The apparatus of claim 1 or claim 2, wherein the processor being configured to control the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device comprises the processor being configured to cause: If the analysis of the signal indicates that the time at which the power transmitting device provides power at the power circuitry to wirelessly charge the power receiving device is near the FO, the processor is configured to control the power circuitry to interrupt the provision of power for wireless charging of the power receiving device, and If the analysis of the signal indicates that the power transmitting device is proximate to the FO and at a later time the power receiving device is also determined to be proximate to the power transmitting device in addition to the FO, the processor is configured to control the power circuitry not to initiate the provision of power for wireless charging of the power receiving device at least when the FO is determined to be proximate to the power transmitting device.
  5. 5. The apparatus of any one of the preceding claims, wherein the processor is configured to compare one or more signals received from the antenna with a predetermined signature that characterizes a signal expected from the antenna if the foreign object is not proximate to the power transmitting device but the power receiving device is proximate to the power transmitting device as part of the analysis of the signals indicating that the FO removal event has occurred, and to determine the FO removal event based on the comparison.
  6. 6. The apparatus of claim 5, wherein the apparatus comprises antenna loading measurement circuitry configured to measure an antenna voltage from the antenna in response to a current provided to the antenna, and wherein the comparing comprises comparing the antenna voltage to the predetermined signature, wherein the predetermined signature comprises at least one antenna voltage that characterizes when the foreign object is not proximate to the power transmitting device but the power receiving device is proximate to the power transmitting device.
  7. 7. The apparatus of claim 6, wherein the predetermined signature includes an antenna voltage range that characterizes when the foreign object is not proximate to the power transmitting device but the power receiving device is proximate to the power transmitting device.
  8. 8. The apparatus of claim 5, wherein the apparatus comprises antenna loading measurement circuitry configured to measure an antenna voltage from the antenna in response to a current provided to the antenna, wherein the antenna loading measurement circuitry is configured to determine an in-phase I component and a quadrature Q component of the antenna voltage, and wherein the comparing comprises a comparison of the I component and the Q component of the antenna voltage to the predetermined signature, and wherein the predetermined signature is based on an I component and a Q component that characterize when the foreign object is not proximate to the power transmitting device but the power receiving device is proximate to the power transmitting device.
  9. 9. The apparatus of claim 8, wherein the processor is configured to determine that the FO removal event has occurred based on a condition that the I and Q components of the antenna voltage are within a threshold tolerance of the I and Q components of the predetermined signature after the controlling the power circuitry to interrupt the provision of power for wireless charging of the power receiving device.
  10. 10. A method of controlling an apparatus, the apparatus comprising a power transmitting device comprising an antenna, power circuitry configured to provide power via the antenna for wireless charging of a power receiving device, and a processor, wherein the method comprises the following operations by the processor: analyzing at least the signal from the antenna to determine the presence of the power receiving device in proximity to the power transmitting device and to determine the presence of foreign matter in proximity to the power transmitting device, and Controlling the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device based on one or both of the analysis of the signal and the power provided by the power circuitry indicating that the power transmitting device is proximate to foreign matter FO, and In response to the analysis of the signal indicating that a FO removal event has occurred, wherein the FO removal event includes the FO no longer being proximate to the power transmitting device and the power receiving device remaining proximate to the power transmitting device, the power circuitry is controlled to provide power for wireless charging of the power receiving device.

Description

Power circuit device Technical Field The present disclosure relates to an apparatus, and in particular, to an apparatus comprising a power transmitting device, an antenna, and power circuitry. The disclosure also relates to a method for controlling the device. Background Wireless charging of the accessory may be convenient for the user. Near Field Communication (NFC) may be used to perform wireless charging (WLC) of small battery powered accessories. During ongoing charging activities, the power transmitting device performs regular presence checks on the power receiving device and foreign objects (FO, i.e. metal or other NFC tags) in close proximity to the power transmitting device. Typically, in the case of FO presence detection, the power transmitting device may cease ongoing charging activities due to safety risks (e.g., overheating) or in order to avoid damage to FO (e.g., excessive exposure to excessive magnetic field strengths). Disclosure of Invention According to a first aspect of the present disclosure there is provided an apparatus comprising: A power transmitting device, comprising: The antenna is arranged to be connected to the antenna, Power circuitry configured to provide power via the antenna for wireless charging of a power receiving device, and A processor configured to analyze at least signals from the antenna to determine the presence of the power receiving device in proximity to the power transmitting device and to determine the presence of foreign matter FO in proximity to the power transmitting device, and Wherein the processor is configured to: Controlling the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device based on one or both of the analysis of the signal and the power provided by the power circuitry indicating that the power transmitting device is proximate to a foreign object, and In response to the analysis of the signal indicating that a FO removal event has occurred, wherein the FO removal event includes the FO no longer being proximate to the power transmitting device and the power receiving device remaining proximate to the power transmitting device, the power circuitry is controlled to provide power for wireless charging of the power receiving device. In one or more embodiments, the analysis of the signal indicates that the power transmitting device is proximate to a foreign object is determined by the processor being configured to: determining a reduction in efficiency of power transmission between the power transmitting device and the power receiving device based on information indicative of the power received by the power receiving device and information indicative of the power provided by the power circuitry in the signal from the antenna, and A rate of change of the power provided by the power circuitry for wireless charging of the power receiving device above a threshold is determined. In one or more embodiments, the processor is configured to control the power circuitry to provide power for wireless charging of the power receiving device based on the analysis of the signal indicating that the power transmitting device is proximate to the power receiving device and that no FO is proximate to the power receiving device. In one or more embodiments, the processor being configured to control the power circuitry to interrupt or not initiate the provision of power for wireless charging of the power receiving device comprises the processor being configured to cause: If the analysis of the signal indicates that the time at which the power transmitting device provides power at the power circuitry to wirelessly charge the power receiving device is near the FO, the processor is configured to control the power circuitry to interrupt the provision of power for wireless charging of the power receiving device, and If the analysis of the signal indicates that the power transmitting device is proximate to the FO and at a later time the power receiving device is also determined to be proximate to the power transmitting device in addition to the FO, the processor is configured to control the power circuitry not to initiate the provision of power for wireless charging of the power receiving device at least when the FO is determined to be proximate to the power transmitting device. In one or more embodiments, the processor is configured to compare one or more signals received from the antenna to a predetermined signature that characterizes a signal expected from the antenna if the foreign object is not proximate to the power transmitting device but the power receiving device is proximate to the power transmitting device as part of the analysis of the signals indicating that the FO removal event has occurred, and determine the FO removal event based on the comparison. In one or more embodiments, the apparatus includes antenna loading measurement circuitry configured to measure an antenna voltage from the antenna in resp