US 10,770,921 B2 · Wireless charging system with start-up negotiation

Abstract

A wireless power transmission system has a wireless power receiving device that is located on a charging surface of a wireless power transmitting device. The wireless power transmitting device uses measurement circuitry such as coil impedance measurement circuitry or impulse-response circuitry that makes coil inductance measurements to monitor the charging surface for the presence of the wireless power receiving device. In response to detecting that the wireless power receiving device is present on the charging surface, the wireless power transmitting device and the wireless power receiving device establish a wireless communications link. The wireless power transmitting device transmits information on wireless power transmission capabilities of the wireless power transmitting device to the wirelessly power receiving device. The receiving device selects desired settings and transmits these to the transmitting device.

Claims20

Dependent claims

A wireless power transmitting device having a charging surface configured to receive a wireless power receiving device, wherein the wireless power receiving device has a wireless power receiving coil configured to receive wireless power signals from the wireless power transmitting device, the wireless power transmitting device comprising:

a wireless power transmitting coil;
inverter circuitry coupled to the wireless power transmitting coil, wherein the inverter circuitry is configured to supply a drive signal to the wireless power transmitting coil to produce the wireless power signals;
measurement circuitry coupled to the wireless power transmitting coil to detect when the wireless power receiving device is present;
and
control circuitry configured to:
detect that the wireless power receiving device is present on the charging surface using the measurement circuitry;
in response to detecting that the wireless power receiving device is present on the charging surface, establish a wireless communications link with the wireless power receiving device;
and
wirelessly receive a wireless power transmission sleep timer setting over the wireless communications link.

6 more elements

a wireless power transmitting coil;
inverter circuitry coupled to the wireless power transmitting coil, wherein the inverter circuitry is configured to supply a drive signal to the wireless power transmitting coil to produce the wireless power signals;
measurement circuitry coupled to the wireless power transmitting coil to detect when the wireless power receiving device is present;
and
control circuitry configured to:
detect that the wireless power receiving device is present on the charging surface using the measurement circuitry;
in response to detecting that the wireless power receiving device is present on the charging surface, establish a wireless communications link with the wireless power receiving device;
and
wirelessly receive a wireless power transmission modulation scheme setting over the wireless communications link.

6 more elements

a wireless power transmitting coil;
inverter circuitry coupled to the wireless power transmitting coil, wherein the inverter circuitry is configured to supply a drive signal to the wireless power transmitting coil to produce the wireless power signals;
measurement circuitry coupled to the wireless power transmitting coil to detect when the wireless power receiving device is present;
control circuitry configured to:
detect that the wireless power receiving device is present on the charging surface using the measurement circuitry;
in response to detecting that the wireless power receiving device is present on the charging surface, establish a wireless communications link with the wireless power receiving device;
and
wirelessly receive minimum and maximum duty cycle wireless power transmission settings over the wireless communications link.

5 more elements

Dependencies are inferred from the claim text.

Wireless charging system with start-up negotiation

Life of this patent

Wireless charging system with start-up negotiation

Life of this patent

Abstract

Claims20