METHOD AND DEVICE FOR NEAR FIELD COMMUNICATION WIRELESS CHARGING TRANSMITTER

1 . A charging transmitter device configured to carry out a near-field wireless charging of a power receiver device, the charging transmitter device comprising:

a charging safeguarding circuit including:

a detection circuit configured to detect a movement of the power receiver device relative to the charging transmitter device; and

a charging control circuit configured to stop the charging in response to detecting the movement of the power receiver device.

2 . The charging transmitter device according to claim 1 , further comprising:

an antenna configured to:

emit, during the charging, a charging radiofrequency signal; and

detect a second radiofrequency signal outside the charging transmitter device;

wherein the detection circuit is further configured to detect the movement of the power receiver device based on the second radiofrequency signal detected by the antenna.

3 . The charging transmitter device according to claim 2 , wherein the detection circuit is configured to:

extract an amplitude and phase of the second radiofrequency signal detected by the antenna;

detect the movement of the power receiver device relative to the charging transmitter device based on a comparison between the extracted amplitude and phase and thresholds representative of the movement; and

generate a detection signal in response to detecting the movement.

4 . The charging transmitter device according to claim 3 , wherein the charging control circuit comprises a logic circuit configured to:

receive the detection signal; and

stop the charging in response to detecting the movement of the power receiver device.

5 . The charging transmitter device according to claim 3 , further comprising:

at least one radiofrequency driver configured to generate the charging radiofrequency signal;

wherein the charging control circuit is configured to stop the at least one radiofrequency driver in response to the detection circuit detecting the movement of the power receiver device.

6 . The charging transmitter device according to claim 5 , further comprising:

an impedance matching circuit between the at least one radiofrequency driver and the antenna, wherein an impedance of the impedance matching circuit is matched based on the antenna of the power receiver device being disposed opposite and proximate to the antenna of the charging transmitter device.

7 . The charging transmitter device according to claim 2 , further comprising:

at least one radiofrequency driver configured to generate the charging radiofrequency signal;

wherein the charging control circuit is configured to stop the at least one radiofrequency driver in response to the detection circuit detecting the movement of the power receiver device.

8 . The charging transmitter device according to claim 7 , further comprising:

an impedance matching circuit between the at least one radiofrequency driver and the antenna, wherein an impedance of the impedance matching circuit is matched based on the antenna of the power receiver device being disposed opposite and proximate to the antenna of the charging transmitter device.

9 . A method for near-field wireless charging of a power receiver device based on a charging transmitter device, the method comprising:

safeguarding, by a charging safeguarding circuit of the charging transmitter device, charging, the safeguarding comprising:

detecting, by a detection circuit of the charging safeguarding circuit, a movement of the power receiver device relative to the charging transmitter device; and

stopping, by a charging control circuit of the charging safeguarding circuit, the charging in response to detecting the movement of the power receiver device.

10 . The method according to claim 9 , further comprising, during the charging:

emitting, by an antenna of the charging transmitter device, a charging radiofrequency signal;

detecting, by the antenna, a second radiofrequency signal outside the charging transmitter device; and

detecting, by the detection circuit, the movement of the power receiver device relative to the charging transmitter device based on the second radiofrequency signal detected by the antenna.

11 . The method according to claim 10 , further comprising:

extracting, by the detection circuit, an amplitude and phase of the second radiofrequency signal detected by the antenna;

detecting the movement of the power receiver device relative to the charging transmitter device based on a comparison between the extracted amplitude and phase and thresholds representative of the movement; and

generating a detection signal in response to detecting the movement.

12 . The method according to claim 11 , further comprising:

receiving, by a logic circuit of the charging control circuit, the detection signal; and

stopping, by the logic circuit, the charging in response to detecting the movement of the power receiver device.

13 . The method according to claim 11 , further comprising:

generating, by at least one radiofrequency driver, the charging radiofrequency signal; and

stopping, by the charging control circuit, the at least one radiofrequency driver in response to detecting, by the detection circuit, the movement of the power receiver device.

14 . The method according to claim 13 , further comprising:

matching an impedance, by an impedance matching circuit between the at least one radiofrequency driver and the antenna, based on the antenna of the power receiver device being disposed opposite and proximate to the antenna of the charging transmitter device.

15 . The method according to claim 10 , further comprising:

generating, by at least one radiofrequency driver, the charging radiofrequency signal; and

stopping, by the charging control circuit, the at least one radiofrequency driver in response to detecting, by the detection circuit, the movement of the power receiver device.

16 . The method according to claim 15 , further comprising:

matching an impedance, by an impedance matching circuit between the at least one radiofrequency driver and the antenna, based on the antenna of the power receiver device being disposed opposite and proximate to the antenna of the charging transmitter device.

17 . A charging transmitter device configured to carry out a near-field wireless charging of a power receiver device, the charging transmitter device comprising:

at least one radiofrequency driver configured to generate a charging radiofrequency signal;

an antenna configured to:

emit, during the charging, the charging radiofrequency signal; and

detect a second radiofrequency signal outside the charging transmitter device;

a detection circuit configured to:

detect a movement of the power receiver device relative to the charging transmitter device based on the second radiofrequency signal detected by the antenna; and

generate a detection signal in response to detecting the movement;

a charging control circuit configured to:

receive the detection signal; and

stop the charging in response to detecting the movement of the power receiver device.

18 . The charging transmitter device according to claim 17 , wherein the detection circuit is further configured to:

extract an amplitude and phase of the second radiofrequency signal detected by the antenna; and

detect the movement of the power receiver device relative to the charging transmitter device based on a comparison between the extracted amplitude and phase and thresholds representative of the movement.

19 . The charging transmitter device according to claim 17 , wherein the charging control circuit is further configured to stop the at least one radiofrequency driver in response to the detection circuit detecting the movement of the power receiver device.

20 . The charging transmitter device according to claim 19 , further comprising:

an impedance matching circuit between the at least one radiofrequency driver and the antenna, wherein an impedance of the impedance matching circuit is matched based on the antenna of the power receiver device being disposed opposite and proximate to the antenna of the charging transmitter device.