Systems, methods, and apparatus for living object protection in wireless power transfer applications

Patent metadata

Field	Value
Publication number	US-2016109564-A1
Application number	US-201514801559-A
Country	US
Kind code	A1
Filing date	Jul 16, 2015
Priority date	Oct 17, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

Systems, methods, and apparatus for living object protection in wireless power transfer applications are provided. In one aspect, an apparatus for detecting objects in a detection area of a wireless power transfer system is provided. The apparatus comprises a plurality of radar transceivers. The apparatus comprises at least one processor configured to receive radar data from the plurality of radar transceivers, detect an object in the detection area based on the received radar data, and adjust the detection area. The apparatus is configured to adjust the detection area based on at least one of a type of chargeable vehicle present, an amount of power being wirelessly transferred by the wireless power transfer system, an alignment of a vehicle with the wireless power transfer system, or a speed of the object approaching the detection area.

First claim

What is claimed is:

1 . An apparatus for detecting objects in a detection area of a wireless power transfer system, the apparatus comprising:
a plurality of radar transceivers; and at least one processor configured to:
receive radar data from the plurality of radar transceivers,
detect an object in the detection area based on the received radar data, and
adjust the detection area.

2 . The apparatus of claim 1 , wherein the processor is configured to adjust the detection area based on at least one of a type of chargeable vehicle present, an amount of power being wirelessly transferred by the wireless power transfer system, an alignment of a vehicle with the wireless power transfer system, or a speed of the object approaching the detection area.

3 . The apparatus of claim 1 , wherein each of the plurality of radar transceivers comprises a transmit antenna and a receive antenna, a distance between the transmit antenna and the receive antenna based on a desired detection area.

4 . The apparatus of claim 1 , wherein the processor is further configured to determine at least one of a distance, a speed, a position, a direction and a size of the object with respect to at least one of the plurality of radar transceivers.

5 . The apparatus of claim 1 , wherein the processor is further configured to:
process the received radar data according to one or both of a time domain algorithm and a frequency domain algorithm, and determine a presence of the object based on at least one of the time domain processed radar data satisfying a first detection criteria or the frequency domain processed radar data satisfying a second detection criteria.

6 . The apparatus of claim 5 , wherein processing the received radar data according to the time domain algorithm comprises determining an envelope waveform based on a plurality of discrete samples of the received radar data to form the time domain processed radar data, and wherein the first detection criteria comprises an envelope waveform amplitude threshold.

7 . The apparatus of claim 6 , wherein the processor is further configured to determine the envelope waveform by, for each of the plurality of discrete samples:
determining an average of an absolute value of a predetermined number of the discrete samples adjacent to and including a corresponding one of the discrete samples, and assigning the average to the corresponding discrete sample, wherein the envelope waveform comprises the assigned averages for each of the plurality of discrete samples.

8 . The apparatus of claim 5 , wherein processing the received radar data according to the frequency domain algorithm comprises:
assigning each of a plurality of discrete samples of the received radar data to one of a plurality of sections, and separately performing a fast fourier transform on each of the plurality of sections to generate a frequency response indication for each of the plurality of sections, wherein the frequency domain processed radar data comprises the frequency response indications and the second detection criteria comprises a frequency amplitude threshold.

9 . A method for detecting objects in a detection area of a wireless power transfer system, the method comprising:
transmitting a radar signal utilizing at least one of a plurality of radar transceivers, receiving the radar signal utilizing the at least one of the plurality of radar transceivers, receiving radar data associated with the received radar signal, detecting an object in the detection area based on the received radar data, and adjusting the detection area.

10 . The method of claim 9 , wherein the detection area is adjusted based on at least one of a type of chargeable vehicle present, an amount of power being wirelessly transferred by the wireless power transfer system, an alignment of a vehicle with the wireless power transfer system, or a speed of an object approaching the detection area.

11 . The method of claim 9 , further comprising basing a distance between a transmit antenna and a receive antenna on each of the plurality of radar transceivers on a desired detection area.

12 . The method of claim 9 , further comprising determining at least one of a distance, a speed, a position, a direction and a size of the object with respect to at least one of the plurality of radar transceivers.

13 . The method of claim 9 , further comprising:
processing the received radar data according to one or both of a time domain algorithm and a frequency domain algorithm, and determining a presence of the object based on at least one of the time domain processed radar data satisfying a first detection criteria or the frequency domain processed radar data satisfying a second detection criteria.

14 . The method of claim 13 , wherein processing the received radar data according to the time domain algorithm comprises determining an envelope waveform based on a plurality of discrete samples of the received radar data to form the time domain processed radar data, and wherein the first detection criteria comprises an envelope waveform amplitude threshold.

15 . The method of claim 14 , wherein determining the envelope waveform comprises, for each of the plurality of discrete samples:
determining an average of an absolute value of a predetermined number of the discrete samples adjacent to and including a corresponding one of the discrete samples, and assigning the average to the corresponding discrete sample, wherein the envelope waveform comprises the assigned averages for each of the plurality of discrete samples.

16 . The method of claim 13 , wherein processing the received radar data according to the frequency domain algorithm comprises:
assigning each of a plurality of discrete samples of the received radar data to one of a plurality of sections, and separately performing a fast fourier transform on each of the plurality of sections to generate a frequency response indication for each of the plurality of sections, wherein the frequency domain processed radar data comprises the frequency response indications and the second detection criteria comprises a frequency amplitude threshold.

17 . A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus for detecting objects in a detection area of a wireless power transfer system to:
transmit a radar signal utilizing at least one of a plurality of radar transceivers, receive the radar signal utilizing the at least one of the plurality of radar transceivers, receive radar data associated with the received radar signal, detect an object in a detection area based on the received radar data, and adjust the detection area.

18 . The medium of claim 17 , wherein the code, when executed, causes the apparatus to adjust the detection area based on at least one of a type of chargeable vehicle present, an amount of power being wirelessly transferred by the wireless power transfer system, an alignment of a vehicle with the wireless power transfer system, or a speed of an object approaching the detection area.

19 . The medium of claim 17 , wherein a distance between a transmit antenna and a receive antenna in each of the plurality of radar transceivers is based on a desired detection area.

20 . The medium of claim 17 , wherein the code, when executed, causes the apparatus to determine at least one of a distance, a speed, a position, a direction and a size of the object with respect to at least one of the plurality of radar transceivers.

Assignees

• Qualcomm Inc

Inventors

• Sieber Lukas
• Chopra Swagat

Classifications

• B60L53/122

  Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil · CPC title

• B60L53/126

  Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver · CPC title

• B60L53/124

  Detection or removal of foreign bodies · CPC title

• B60L53/66

  Data transfer between charging stations and vehicles · CPC title

• G01S13/06

  Systems determining position data of a target · CPC title