Techniques for improved wireless energy transmission efficency
AssigneeAnalog Devices International Unlimited Company
InventorsWenwei Li, Eko Lisuwandi, Brian James Shaffer
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Abstract
Techniques for improving efficiency of wireless power transfer to shunt-based receiver are provided. In an example, techniques can optimize wireless power transfer by comparing instantaneous peak voltage of a transmit coil of a wireless power transmitter to an average peak voltage of the transmit coil, and then, based on the comparison, adjust a setpoint of the wireless power transmitter to a more efficient level.
Claims21
A wireless energy transfer management circuit for managing wireless energy transfer from a wireless energy transmitter to a wireless energy receiver having incoming wireless energy shunting capability, the circuit comprising:
- a wireless energy transmitter including:
- a transmit inductor;
- and
- a transmit energy control input configured to adjust wireless energy transfer by the wireless energy transmitter in response to an indication, at the transmit inductor, of an occurrence of shunting of wirelessly transferred energy away from a load that is electrically coupled to a wireless energy receive inductor of the wireless energy receiver.
A method of operating a wireless power transmitter, the method comprising:
- transmitting energy to a receiver device using a transmit inductor;
- detecting a shunt event of the receiver device via a voltage spike on the transmit inductor;
- and
- adjusting level of energy transfer to the receiver in response to the shunt event.
A circuit for optimizing wireless energy transfer to a shunting receiver, the circuit comprising:
- a wireless energy transmitter configured to excite a transmit inductor with an excitation signal having a duty cycle;
- means for providing a duty cycle setpoint for the duty cycle;
- means for detecting a shunt event at the circuit;
- and
- means for adjusting the duty cycle setpoint in response to the shunt event.
Dependencies are inferred from the claim text.