US 10,998,776 B2 · Wireless power system with in-band communications

Abstract

A wireless power receiving device has a coil that receives wireless power signals from a wireless power transmitting device and has a rectifier that produces direct-current power across rectifier output terminals using the received wireless power signals. A load in the wireless power receiving device receives a direct-current output voltage from the rectifier output terminals. In-band communications are supported in which an amplitude-shift keying communications scheme or other communications scheme is used by a data transmitter in the wireless power receiving device to transmit in-band data through the coil. In-band data is transmitted by modulating one or more transistors that are coupled to the coil and other wireless power receiving circuitry in series with one or more capacitors and is transmitted by modulating current flow through a ballast transistor or other adjustable load that is coupled across the rectifier output terminals.

Claims21

Dependent claims

A wireless power receiving device configured to wirelessly receive power during wireless power transmission from a wireless power transmitting device, comprising:

wireless power receiving circuitry that includes a coil and rectifier, configured to:
receive wireless power signals with the coil;
and
supply a corresponding output voltage across rectifier output terminals;
an adjustable load coupled to the rectifier output terminals;
capacitance switching circuitry coupled to the wireless power receiving circuitry;
and
control circuitry configured to:
transmit data signals to the wireless power transmitting device, using the coil, by adjusting a capacitance coupled to the wireless power receiving circuitry with the capacitance switching circuitry;
and
transmit data signals to the wireless power transmitting device, using the coil, by adjusting the adjustable load.

8 more elements

A wireless power receiving device configured to wirelessly receive power during wireless power transmission from a wireless power transmitting device, comprising:

a coil;
a rectifier configured to:
rectify wireless power signals received with the coil;
and
supply a corresponding output voltage across rectifier output terminals;
a load that receives the output voltage;
a ballast load coupled across the rectifier output terminals;
a current sensor configured to measure current flow through the load;
and
control circuitry having a data transmitter, wherein the control circuitry is configured to:
adjust the ballast load based on information from the current sensor;
and
use the data transmitter to adjust current flow through the ballast load to transmit data from the coil to the wireless power transmitting device.

10 more elements

A wireless power receiving device configured to wirelessly receive power during wireless power transmission from a wireless power transmitting device, comprising:

a coil;
a rectifier that is configured to rectify wireless power signals received with the coil and that is configured to supply a corresponding output voltage across rectifier output terminals;
a load that includes a display and a battery and that receives the output voltage;
a first transistor coupled to the rectifier output terminals;
a capacitor;
a second transistor coupled to the coil in series with the capacitor;
control circuitry having a data transmitter, wherein the control circuitry is configured to:
use the data transmitter to transmit data signals through the coil by adjusting current flow through the first transistor;
and
use the data transmitter to transmit data signals through the coil by adjusting the second transistor.

7 more elements

Dependencies are inferred from the claim text.

Wireless power system with in-band communications

Life of this patent

Wireless power system with in-band communications

Life of this patent

Abstract

Claims21