Soft switched single stage wireless power transfer
First Claim
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1. A wireless power transmission circuit comprising:
- a voltage source having first and second output terminals;
a first pair of complementary switches coupled in series and connected between the first and second output terminals, wherein a first switch node is positioned between the first pair of complementary switches;
a second pair of complementary switches coupled in series and connected between the first and second output terminals, wherein a second switch node is positioned between the second pair of complementary switches;
an antenna network coupled between the first switch node and the second switch node; and
a resonant circuit coupled to the antenna network and configured to resonate at a frequency that is different than a resonant frequency of the antenna network to create out of phase voltage and current signals that enable one or more switches of the first pair of complementary switches to operate with zero voltage switching (ZVS);
wherein power from the voltage source to the antenna network is regulated by changing a delay between an on-state of a solid-state switch of the first pair of complementary switches and an on-state of a solid-state switch of the second pair of complementary switches.
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Abstract
A control scheme and architecture for a wireless electrical energy transmission circuit employs two solid-state switches and a zero voltage switching (ZVS) topology to power an antenna network. The switches drive the antenna network at its resonant frequency and simultaneously energize a separate resonant circuit that has a resonant frequency lower than the antenna circuit. The resonant circuit creates out of phase voltage and current waveforms that enable the switches to operate with (ZVS).
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Citations
18 Claims
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1. A wireless power transmission circuit comprising:
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a voltage source having first and second output terminals; a first pair of complementary switches coupled in series and connected between the first and second output terminals, wherein a first switch node is positioned between the first pair of complementary switches; a second pair of complementary switches coupled in series and connected between the first and second output terminals, wherein a second switch node is positioned between the second pair of complementary switches; an antenna network coupled between the first switch node and the second switch node; and a resonant circuit coupled to the antenna network and configured to resonate at a frequency that is different than a resonant frequency of the antenna network to create out of phase voltage and current signals that enable one or more switches of the first pair of complementary switches to operate with zero voltage switching (ZVS); wherein power from the voltage source to the antenna network is regulated by changing a delay between an on-state of a solid-state switch of the first pair of complementary switches and an on-state of a solid-state switch of the second pair of complementary switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power transmission circuit comprising:
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a voltage source having first and second output terminals; a first pair of switches coupled in series and connected between the first and second output terminals, a first switch node positioned between the first pair of switches; a second pair of switches coupled in series and connected between the first and second output terminals; a second switch node positioned between the second pair of switches; an antenna network coupled between the first switch node and the second switch node; and a resonant circuit coupled to the antenna network and configured to resonate at a frequency that is different than a resonant frequency of the antenna network to create out of phase voltage and current signals that enable one or more switches of the first pair of switches to operate with zero voltage switching (ZVS). - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification