Method and apparatus for contactless power transfer
First Claim
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1. 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;
first impedance transformation network circuitry interconnected between the tuned switch-mode supply and the primary coil; and
second impedance transformation network circuitry interconnected between the secondary coil and the rectifier stage, wherein a phase angle of an input impedance of the first impedance transformation circuitry is correlated with an amount of power output to the load.
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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.
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Citations
20 Claims
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1. An apparatus for wireless power transfer, comprising:
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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; first impedance transformation network circuitry interconnected between the tuned switch-mode supply and the primary coil; and second impedance transformation network circuitry interconnected between the secondary coil and the rectifier stage, wherein a phase angle of an input impedance of the first impedance transformation circuitry is correlated with an amount of power output to the load.
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2. A circuit for inductive power transfer, comprising:
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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 an amount of power delivered to the load. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A circuit for inductive power transfer, comprising:
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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 an amount of power inductively transferred from the primary coil. - View Dependent Claims (17, 18, 19, 20)
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Specification