Back to results
US 12,009,675 B2Granted
Apparatus and methods for real-time resonance adaptation for power receiver
AssigneeThe Regents of the University of California
InventorsHongming Lyu, Aydin Babakhani
Life of this patent
Estimating the term…
Abstract
Wirelessly powered receiver system and sensors are described. In an embodiment, the power receiver system, includes an inductive coil that receives wireless power from an external transmitter, a capacitor bank that optimizes power transfer to an energy harvesting device, and a power-receiving frontend RF-DC rectifier with a periodically enabled closed feedback loop that adapts settings of the capacitor bank in real-time to adapt to changes on the inductive coil to maximize power transfer efficiency.
Claims27
A power receiver system, comprising:
- an inductive coil configured to receive wireless power from an external transmitter;
- a resonance capacitor comprising a capacitor bank having an input coupled to the inductive coil, and a plurality of capacitors configured to be selectively included in one or more of a plurality of capacitor-bank settings;
- a power-receiving frontend RF-DC rectifier coupled to the capacitor bank;
- and
- an amplitude detector having an input coupled to the input of the capacitor bank and an output, the amplitude detector configured to provide measurements of the input of the capacitor bank, and
- a resonance compensator having outputs coupled to the capacitor bank and an input coupled to the output of the amplitude detector, the resonance compensator configured to:
- sample the measurements of the input of the capacitor bank through the amplitude detector;
- and
- adapt the resonance capacitor by selecting an optimal capacitor-bank setting based on the measurements of the input of the capacitor bank in real-time to adapt to changes on the inductive coil.
6 more elements
A wirelessly powered sensor chip configured for placement relative to a surrounding environment, comprising:
- an inductive coil configured to receives wireless power from an external transmitter;
- a capacitor bank having an input coupled to the inductive coil, the capacitor bank comprising a plurality of capacitors configured to be selectively included in one or more of a plurality of capacitor-bank settings;
- a power-receiving frontend RF-DC rectifier coupled between the capacitor bank;
- and
- an amplitude detector having an input coupled to the input of the capacitor bank and an output, the amplitude detector configured to provide measurements of the input of the capacitor bank, and
- a resonance compensator having outputs coupled to the capacitor bank and an input coupled to the output of the amplitude detector, the resonance compensator configured to:
- sample the measurements of the input of the capacitor bank through the amplitude detector;
- select an optimal capacitor-bank setting based on the measurements of the input of the capacitor bank in real-time to adapt to the surrounding environment;
- and
- a transmitter configured to transmit information related to the capacitor-bank settings and voltage readings to an external controller.
7 more elements
A sensor system comprising:
- a wirelessly powered sensor chip configured for placement relative to a surrounding environment, comprising:
- an inductive coil configured to receives wireless power from an external transmitter;
- a capacitor bank having an input coupled to the inductive coil, the capacitor bank comprising a plurality of capacitors configured to be selectively included in one or more of a plurality of capacitor-bank settings;
- a power-receiving frontend RF-DC rectifier coupled between the capacitor bank;
- and
- an amplitude detector having an input coupled to the input of the capacitor bank and an output, the amplitude detector configured to provide measurements of the input of the capacitor bank, and
- a resonance compensator having outputs coupled to the capacitor bank and an input coupled to the output of the amplitude detector, the resonance compensator configured to:
- sample the measurements of the input of the capacitor bank through the amplitude detector, and select an optimal capacitor-bank setting based on the measurements of the input of the capacitor bank in real-time to adapt to the surrounding environment;
- a transmitter configured to transmit information related to the capacitor-bank settings and voltage readings;
- and
- a controller configured to receive and process the transmit information related to the capacitor-bank settings and voltage readings to determine as aspect of the surrounding environment.
8 more elements
Dependencies are inferred from the claim text.