Method and apparatus for contactless power transfer
AssigneeUniversity of Florida Research Foundation, Inc.
InventorsZhen Ning Low, Jenshan Lin, Raul Andres Chinga
Life of this patent
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Abstract
Embodiments of the subject invention pertain to a method and apparatus for contactless power transfer. A specific embodiment relates to an impedance transformation network, a new class of load network for application to a contactless power system. Embodiments of the impedance transformation network enable a contactless power system to operate without encountering the common problems of: 1) over-voltage and/or under-voltage conditions; 2) over-power and/or under-power conditions; 3) power oscillations; and 4) high heat dissipation.
Claims21
1-110. (canceled)
An apparatus for wireless power transfer, comprising:
- a rectifier stage, wherein the rectifier stage is adapted to interconnect with a load;
- a secondary coil, wherein the secondary coil is interconnected with the rectifier stage;
- a primary coil, wherein the primary coil is coupled to the secondary coil;
- a tuned switch-mode supply, wherein the tuned switch-mode supply is interconnected to the primary coil;
- a power supply, wherein the power supply supplies power to the tuned switch-mode supply;
- a first circuitry interconnected between the tuned switch-mode supply and the primary coil;
- and
- a second circuitry interconnected between the secondary coil and the rectifier stage, wherein power output to the load is adjusted as the phase angle of the load changes.
A circuit for inductive power transfer, comprising:
- an impedance transformation network, comprising:
- an input port configured to couple to an active device that creates a signal at a selected operating frequency, the impedance transformation network having an input impedance looking into the impedance transformation network through the input port,
- an output port configured to couple to a load having a variable impedance;
- and
- a reactive network coupled between the input port and the output port, wherein the reactive network comprises:
- a primary coil;
- and
- a secondary coil inductively coupled to the primary coil;
- wherein, when the output port is coupled to the load and the input port is coupled to the active device, a phase angle of the input impedance is correlated with the amount of power delivered to the load.
A circuit for inductive power transfer, comprising:
- a primary impedance transformation network, comprising:
- an input port configured to couple to an active device that creates a signal at a selected operating frequency, the primary impedance transformation network having an input impedance looking into the primary impedance transformation network through the input port,
- a primary coil configured to couple to a secondary coil;
- and
- a reactive network coupled to the input port and coupled to the primary coil, wherein the reactive network comprises:
- at least one capacitor;
- and
- at least one inductor;
- wherein when the primary coil is coupled to the secondary coil and the input port is coupled to the active device, a phase angle of the input impedance is correlated with the amount of power inductively transferred from the primary coil.
Dependencies are inferred from the claim text.