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Soft switched single stage wireless power transfer

  • US 10,424,970 B2
  • Filed: 05/29/2018
  • Issued: 09/24/2019
  • Est. Priority Date: 09/25/2014
  • Status: Active Grant
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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