Wireless power transfer system and method
First Claim
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1. A system comprising:
- a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches;
a primary resonant tank coupled to the plurality of power switches, wherein a resonant capacitor of the primary resonant tank is formed by a first variable capacitance network, and wherein the first variable capacitance network is modulated to improve soft switching of the plurality of power switches through reducing a voltage level and a current level of a switch at a turn-on instant; and
a primary coil coupled to the primary resonant tank.
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Abstract
A system comprises a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches, a primary resonant tank coupled to the plurality of power switches, wherein a resonant capacitor of the primary resonant tank is formed by a first variable capacitance network, and wherein the first variable capacitance network is modulated to improve soft switching of the plurality of power switches through reducing a voltage level and a current level of a switch at a turn-on instant and a primary coil coupled to the primary resonant tank.
14 Citations
20 Claims
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1. A system comprising:
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a primary switch network coupled to a power source, wherein the primary switch network comprises a plurality of power switches; a primary resonant tank coupled to the plurality of power switches, wherein a resonant capacitor of the primary resonant tank is formed by a first variable capacitance network, and wherein the first variable capacitance network is modulated to improve soft switching of the plurality of power switches through reducing a voltage level and a current level of a switch at a turn-on instant; and a primary coil coupled to the primary resonant tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for a power apparatus comprising:
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detecting a signal representing a current level at a turn-on transition of a power switch of a primary switch network, wherein the primary switch network is coupled to a primary resonant tank having a resonant capacitor formed by a first variable capacitance network comprising a plurality of switch-capacitor networks; and modulating a capacitance of the first variable capacitance network to improve soft switching of the power switch through reducing a voltage level and a current level at the turn-on transition of the power switch. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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providing a wireless power transfer system comprising a transmitter magnetically coupled to a first receiver, wherein; the transmitter comprises a power amplifier coupled to an input power source, a transmitter resonant tank comprising a first variable capacitance network and a transmitter coil coupled to the transmitter resonant tank; and the first receiver comprises a first receiver resonant tank comprising a first receiver variable capacitance network and a first receiver coil coupled to the first receiver resonant tank; and modulating a capacitance of the first variable capacitance network so that switches of the power amplifier achieve an improved soft switching condition. - View Dependent Claims (17, 18, 19, 20)
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Specification