VARIABLE CAPACITOR FOR RESONANT POWER TRANSFER SYSTEMS
First Claim
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1. A resonator of a wireless power transfer system, comprising:
- an inductor adapted to receive or transmit wireless power;
first and second switched capacitor circuits electrically connected to opposite poles of the inductor, each of the first and second switched capacitor circuits comprising a first capacitor in series with a MOSFET and a second capacitor in parallel with the first capacitor; and
a controller electrically connected to the first and second switched capacitor circuits, the controller configured to switch the MOSFETS on and off to change a capacitance of the first and second switched capacitor circuits to adjust an effective capacitance of the resonator.
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Abstract
Systems and designs for tuning a wireless power transfer system are provided, which may include any number of features. In one embodiment, a wireless power transfer system can include first and second switched capacitor circuits electrically connected to opposite poles of the inductor of a resonator in the wireless power system. The first and second switched capacitor circuits can be switched on and off with MOSFETS to change a capacitance of the circuits, and thus an effective capacitance of the resonator. Methods of use are also provided.
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Citations
15 Claims
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1. A resonator of a wireless power transfer system, comprising:
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an inductor adapted to receive or transmit wireless power; first and second switched capacitor circuits electrically connected to opposite poles of the inductor, each of the first and second switched capacitor circuits comprising a first capacitor in series with a MOSFET and a second capacitor in parallel with the first capacitor; and a controller electrically connected to the first and second switched capacitor circuits, the controller configured to switch the MOSFETS on and off to change a capacitance of the first and second switched capacitor circuits to adjust an effective capacitance of the resonator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a wireless power transfer system, comprising the steps of:
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transmitting or receiving wireless power with an inductor of a resonator; and adjusting with a controller an effective capacitance of the resonator by changing a capacitance of first and second switched capacitor circuits connected to opposite poles of the inductor. - View Dependent Claims (12, 13, 14, 15)
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Specification