In-Band Signaling Within Wireless Power Transfer Systems
First Claim
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1. A method of operating a wireless power transfer system comprising a source device and a load device, the method comprising:
- transferring power from the source device to the load device; and
during power transfer from the source device to the load device;
determining, by the load device, a data signal to be communicated to the source device; and
modifying a timing, by the load device, of a synchronous rectifier within the load device in a pattern based on the data signal.
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Abstract
Systems and methods for in-band communication across a wireless power interface from a load device to a source device. The load device selectively modifies the timing of switches within a voltage rectifier coupled to an output of a receive coil within the load device that receives power from a transmit coil within the source device. The source device detects changes in the power transfer (or in the relative timing of a voltage or a current) as digital information received from the load device.
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Citations
20 Claims
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1. A method of operating a wireless power transfer system comprising a source device and a load device, the method comprising:
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transferring power from the source device to the load device; and during power transfer from the source device to the load device; determining, by the load device, a data signal to be communicated to the source device; and modifying a timing, by the load device, of a synchronous rectifier within the load device in a pattern based on the data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a wireless power transfer system that includes a source device and a load device, the method comprising:
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transferring power from the source device to the load device; and during power transfer from the source device to the load device; determining, by the source device, that a current threshold crossing has occurred within an electronic element of the source device; and buffering, by the source device, a digital bit based on the current threshold crossing. - View Dependent Claims (10, 11)
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12. A method for operating a wireless power transfer system that includes a source device and a load device, the method comprising:
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transferring power from the source device to the load device; and during power transfer from the source device to the load device; determining, by the source device, that a phase shift has occurred in an alternating current passing through an electronic element of the source device; and buffering, by the source device, a digital bit based on the phase shift. - View Dependent Claims (13, 14)
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15. A wireless power transfer system, comprising:
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a source device comprising; a bridge inverter comprising a first set of switches; a transmit coil coupled to an output of the bridge inverter; and a first processor configured to monitor a first electrical characteristic of the bridge inverter during operation of the bridge inverter; and a load device aligned with the source device, the load device comprising; a receive coil; a bridge rectifier coupled to an output of the receive coil, the bridge rectifier comprising a second set of switches; and a second processor coupled to the bridge rectifier;
whereinthe second processor is configured to perform a timing modification, the timing modification comprising a delay of a turn-off of at least one switch of the second set of switches; and the timing modification is based, at least in part, on a data signal to be communicated to the source device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification