Airfuel rx headroom adjustment for stability improvement

Patent metadata

Field	Value
Publication number	US-2018269724-A1
Application number	US-201715462523-A
Country	US
Kind code	A1
Filing date	Mar 17, 2017
Priority date	Mar 17, 2017
Publication date	Sep 20, 2018
Grant date	—

Abstract

A wireless power system includes a receiver. The receiver may include a rectifier coupled to a receiver coil to receive power. The receiver may include a detector coupled to the rectifier to receive a monitor signal from the rectifier. The detector may provide a range signal indicating whether the monitor signal is outside a predetermined range. The receiver further includes an oscillation determiner coupled to the detector to receive the range signal. The oscillation determiner may determine that the rectifier is in an oscillation mode or is not in an oscillation mode. In some embodiments a communication unit is coupled to the oscillation determiner. The oscillation determiner may communicate a power adjustment signal and may request increased power through the communication unit.

First claim

What is claimed is:

1 . A wireless receiver, comprising:
a rectifier coupled to receive power from a receiver coil; a detector coupled to receive a monitor signal from the rectifier and provide a range signal indicating whether the monitor signal is outside a predetermined range; and an oscillation determiner coupled to receive the range signal from the detector, the oscillation determiner is configured to determine that the rectifier is in an oscillation mode or is not in an oscillation mode.

2 . The wireless receiver of claim 1 , further including a communication unit coupled to the oscillation determiner, and wherein the oscillation determiner communicates a power adjustment signal and requests for increased power through the communication unit.

3 . The wireless receiver of claim 1 , wherein the detector is configured to compare the received monitor signal against an upper threshold and a lower threshold, and wherein the range signal indicating the monitor signal is outside the predetermined range is provided when the monitor signal crosses both the upper threshold and the lower threshold.

4 . The wireless receiver of claim 1 , wherein the oscillation determiner is configured to determine the oscillation mode of the rectifier based on counting a number of times the range signal is outside the predetermined range.

5 . The wireless receiver of claim 4 , wherein the counting is in a predetermined interval of time.

6 . The wireless receiver of claim 1 , wherein the monitor signal is voltage or a current of the rectifier.

7 . The wireless receiver of claim 2 , wherein the communication unit transmits the power adjustment signal to request for increased power through a wireless communication channel.

8 . The wireless receiver of claim 7 , wherein the communication channel is an inductance link.

9 . The system of claim 2 , wherein in response to the oscillation determiner determining an oscillation mode, the oscillation determiner of the receiver is configured to:
repeating, until determining the receiver stops oscillating:
monitoring an oscillation state of the receiver; and
in response to determining the receiver is oscillating, transmitting a power adjustment signal to request increasing the power received by the receiver;
in response to determining the receiver stops oscillating, repeating until the receiver starts oscillating:
transmitting a power adjustment signal to request decreasing the power received by the receiver; and
monitoring an oscillation state of the receiver;
identifying the power transmitted to the receiver of when the receiver starts oscillating as an oscillation threshold of the receiver; transmitting a power adjustment signal to request increasing the power received by the receiver by a predefined headroom, the predefined headroom is configured to move the oscillation state of the receiver away from the oscillation threshold into the non-oscillating state.

10 . The system of claim 9 , wherein the monitor signal is determined as oscillating when the monitor signal swings outside an interval of greater than a first predetermined value for a first predetermined number of times in a first interval of time.

11 . A method of oscillation control of a receiver of a wireless power system, comprising:
repeating, until determining the receiver stops oscillating:
monitoring an oscillation state of the receiver; and
in response to determining the receiver is oscillating, transmitting a power adjustment signal to request increasing the power received by the receiver;
in response to determining the receiver is not oscillating, repeating until the receiver starts oscillating:
transmitting a power adjustment signal to request decreasing the power received by the receiver; and
monitoring an oscillation state of the receiver;
identifying the power transmitted to the receiver of when the receiver starts oscillating as an oscillation threshold of the receiver; transmitting a power adjustment signal to request increasing the power received by the receiver by a predefined headroom, the predefined headroom is configured to move the oscillation state of the receiver away from the oscillation threshold into the non-oscillating state; and waiting for a predetermined amount of time for stabilizing the receiver.

12 . A method of claim 11 , further comprising:
transmitting the power adjustment signal via a communication unit of the receiver and through wireless channels.

13 . A method of claim 11 , wherein the receiver of the wireless power system includes a rectifier, and wherein the method further comprises:
determining the oscillation state of the receiver based at least on the oscillation state of the rectifier; determining the oscillation state of the rectifier based at least on determining a current or a voltage of the rectifier as oscillating.

14 . A method of claim 13 , further comprising:
determining a voltage of the rectifier as oscillating when the rectifier voltage swings in a voltage interval of greater than a first predetermined value for a first number of times in a first interval of time; determining a current of the rectifier as oscillating when the rectifier current swings in a current interval of greater than a second predetermined value for a second number of times in a second interval of time.

15 . A method of claim 11 , further comprising:
receiving a monitor signal from a rectifier of the receiver; comparing the received monitor signal against an upper threshold and a lower threshold; generating a range signal when the monitor signal crosses both the upper threshold and the lower threshold.

Assignees

• Integrated Device Tech

Inventors

• Smith Nicholaus
• Martchovsky Detelin
• Doan Tuyen

Classifications

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J50/40

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H02J7/025

  Electricity · mapped topic