Method and system for operating a communications device that communicates via inductive coupling

• US 10,720,967 B2
• Filed: 09/25/2017
• Issued: 07/21/2020
• Est. Priority Date: 09/25/2017
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Hueber, Gernot, Merlin, Erich, Bruckbauer, Johannes
• Primary Examiner(s): Trandai, Cindy
• Application Number:
  US15/715,027
• Publication Number:
  US 20190097687A1
• Time in Patent Office: 1,030 Days
• CPC Class Codes: H04B 17/11 for calibration
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/72 for local intradevice communication

Abstract

Embodiments of methods and systems for operating a communications device that communicates via inductive coupling are described. In an embodiment, a method for operating a communications device that communicates via inductive coupling involves adjusting a configuration of the communications device in response to a clock signal that is synchronized to a received clock signal, obtaining information that corresponds to transmission current or power generated in response to the adjusted configuration, and quantifying a detuning condition in response to the obtained information. Other embodiments are also described.

Claims

1. A method for operating a communications device that communicates via inductive coupling, the method comprising:

adjusting a configuration of the communications device in response to a clock signal that is synchronized to a received clock signal;

obtaining information that corresponds to transmission current or power generated in response to the adjusted configuration; and

quantifying a detuning condition as a transmitter impedance ratio that indicates a communications performance of the communications device with respect to a corresponding counterpart communications device in response to the obtained information, wherein the transmitter impedance ratio is between a first transmitter impedance when the corresponding counterpart communications device is within a predefined communications range of the communications device and a second transmitter impedance when there is no corresponding communications device within the predefined communications range of the communications device.

2. The method of claim 1, wherein the configuration of the communications device comprises at least one of:

a phase configuration of the communications device; and

an amplitude or power configuration of a transmitter of the communications device.

3. The method of claim 1, wherein the obtained information comprises at least one of:

transmission current information;

transmission voltage information;

transmission power information; and

received signal strength information.

4. The method of claim 3, wherein quantifying the detuning condition in response to the obtained information comprises quantifying the detuning condition based on the received signal strength information and at least one of the transmission current information, the transmission voltage information, and the transmission power information.

5. The method of claim 1, further comprising quantifying a first detuning condition in response to information that corresponds to transmission current, voltage, or power generated in response to the configuration of the communications device.

6. The method of claim 1, further comprising detecting a change in the detuning condition.

7. The method of claim 1, wherein adjusting the configuration of the communications device in response to the clock signal that is synchronized to the received clock signal comprises adjusting the configuration of the communications device from a first threshold to a second threshold in response to the clock signal that is synchronized to the received clock signal.

8. The method of claim 7, wherein adjusting the configuration of the communications device from the first threshold to the second threshold in response to the clock signal that is synchronized to the received clock signal comprises at least one of:

sweeping a phase relation between a carrier phase and a transmission phase from the first threshold to the second threshold in response to the clock signal that is synchronized to the received clock signal; and

sweeping a transmission signal amplitude from the first threshold to the second threshold in response to the clock signal that is synchronized to the received clock signal.

9. The method of claim 1, further comprising adjusting a transmitter configuration of the communications device in response to the quantified detuning condition.

10. The method of claim 1, wherein quantifying the detuning condition in response to the obtained information comprises quantifying the detuning condition based on the obtained information before transmitting a response message.

11. A communications device that communicates via inductive coupling, the communications device comprising:

a configuration adjustment element configured to adjust a configuration of the communications device in response to a clock signal that is synchronized to a received clock signal;

an information obtaining element configured to obtain information that corresponds to transmission current or power generated in response to the adjusted configuration; and

a detuning condition quantification element configured to quantify a detuning condition as a transmitter impedance ratio that indicates a communications performance of the communications device with respect to a corresponding counterpart communications device in response to the obtained information, wherein the transmitter impedance ratio is between a first transmitter impedance when the corresponding counterpart communications device is within a predefined communications range of the communications device and a second transmitter impedance when there is no corresponding communications device within the predefined communications range of the communications device.

12. The communications device of claim 11, wherein the configuration of the communications device comprises at least one of:

a phase configuration of the communications device; and

an amplitude configuration or power of a transmitter of the communications device.

13. The communications device of claim 11, wherein the obtained information comprises at least one of:

transmission current information;

transmission voltage information;

transmission power information; and

received signal strength information.

14. The communications device of claim 13, wherein the detuning condition quantification element is further configured to quantify the detuning condition based on the received signal strength information and at least one of the transmission current information, the transmission voltage information, and the transmission power information.

15. The communications device of claim 11, wherein the detuning condition quantification element is further configured to quantify a first detuning condition in response to information that corresponds to transmission current, voltage, or power generated in response to the configuration of the communications device.

16. The communications device of claim 11, wherein the detuning condition quantification element is further configured to detect a change in the detuning condition.

17. The communications device of claim 11, wherein the configuration adjustment element is further configured to adjust the configuration of the communications device from a first threshold to a second threshold in response to the clock signal that is synchronized to the received clock signal.

18. The communications device of claim 17, wherein the configuration adjustment element is further configured to:

sweep a phase relation between a carrier phase and a transmission phase from the first threshold to the second threshold in response to the clock signal that is synchronized to the received clock signal; and

sweep a transmission signal amplitude from the first threshold to the second threshold in response to the clock signal that is synchronized to the received clock signal.

19. The communications device of claim 11, wherein the detuning condition quantification element is further configured to quantify the detuning condition based on the obtained information before transmitting a response message.

20. A method for operating a communications device that communicates via inductive coupling, the method comprising:

measuring a first detuning condition that indicates a communications performance of the communications device with respect to a corresponding counterpart communications device in response to a first configuration of the communications device;

adjusting the first configuration of the communications device into a second configuration of the communications device in response to a clock signal that is synchronized to a received clock signal;

obtaining received signal strength information and one of transmission current information, transmission voltage information, and transmission power information that correspond to transmission current, voltage, or power generated in response to the second configuration; and

quantifying a second detuning condition as a transmitter impedance ratio in response to the received signal strength information and the one of transmission current information and transmission power information, wherein the transmitter impedance ratio is between a first transmitter impedance when the corresponding counterpart communications device is within a predefined communications range of the communications device and a second transmitter impedance when there is no corresponding communications device within the predefined communications range of the communications device.