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US 9,425,653 B2Granted
Transmitters for wireless power transmission
AssigneeQUALCOMM Incorporated
InventorsNigel P. Cook, Lukas Sieber, Hanspeter Widmer
Life of this patent
Estimating the term…
Abstract
Exemplary embodiments are directed to wireless power transfer. A wireless power transmitter includes a transmit antenna configured as a resonant tank including a loop inductor and an antenna capacitance. The transmitter further includes an amplifier configured to drive the transmit antenna and a matching circuit operably coupled between the transmit antenna and the amplifier. The transmitter also includes a capacitor integrating the antenna capacitance and a matching circuit capacitance.
Claims21
A wireless power transmitter, comprising:
- a transmit circuit configured as a resonant tank comprising a first capacitor coupled with a first inductor, the transmit circuit configured to wirelessly transmit power in response to a time-varying signal;
- and
- a driver circuit operably coupled to the transmit circuit, the driver circuit configured to generate the time-varying signal, the driver circuit comprising:
- a second inductor coupled in series with the transmit circuit;
- and
- a second capacitor coupled in series with the second inductor and the transmit circuit;
- wherein the second inductor and the first capacitor define a filter configured to provide load matching and/or filtering of a signal generated by the driver or the transmit circuit.
4 more elements
A method for transmitting wireless power, comprising:
- transmitting power wirelessly, by a transmit circuit, in response to a time-varying signal, the transmit circuit configured as a resonant tank comprising a first capacitor coupled with a first inductor;
- generating, by a driver circuit, the time-varying signal, the driver circuit comprising a second inductor coupled in series with the transmit circuit, and a second capacitor coupled in series with the second inductor and the transmit circuit;
- and
- matching and/or filtering the time-varying signal by a filter comprising the second inductor and the first capacitor.
1 more element
A driver circuit for use in wireless power transmitter, comprising:
- means for transmitting power wirelessly in response to a time-varying signal, the means for transmitting comprising means for storing energy in a first electric field coupled with means for storing energy in a first magnetic field;
- and
- means for generating the time-varying signal, the means for generating comprising means for storing energy in a second electric field coupled in series with the means for transmitting power, and means for storing energy in a second magnetic field coupled in series with the means for transmitting power and the means for storing energy in a second electric field;
- wherein the means for storing energy in a second magnetic field and the means for storing energy in a first electric field define a means for filtering which provides load matching and/or filtering of the time-varying signal.
1 more element
A wireless power transmitter, comprising:
- a transmit circuit configured as a resonant tank comprising a first capacitor coupled with a first inductor, the transmit circuit configured to wirelessly transmit power in response to a time-varying signal to power or charge a receiver device;
- and
- a driver circuit operably coupled to the transmit circuit, the driver circuit configured to generate the time-varying signal, the driver circuit comprising:
- a first driver stage circuit comprising:
- a first switch configured to control the time-varying signal in response to a first control signal;
- a second capacitor coupled in parallel with the first switch;
- a third capacitor coupled to the first switch and to the second capacitor;
- and
- a second inductor coupled to the first switch and to the second capacitor;
- and
- a second driver stage circuit comprising:
- a second switch configured to control the time-varying signal in response to a second control signal;
- a fourth capacitor coupled in parallel with the second switch;
- a fifth capacitor coupled to the second switch and to the fourth capacitor;
- and
- a third inductor coupled to the second switch and to the fourth capacitor.
13 more elements
Dependencies are inferred from the claim text.