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Wireless charging system

  • US 9,819,215 B2
  • Filed: 07/17/2015
  • Issued: 11/14/2017
  • Est. Priority Date: 07/17/2015
  • Status: Active Grant
First Claim
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1. A wireless charging system comprising:

  • a DC/AC converting unit providing an AC power, wherein the DC/AC converting unit comprises a DC power supply, a first inductor, a first field effect transistor (FET), a first capacitor, and a controller, a cathode of the DC power supply is grounded, an anode of the DC power supply is electrically coupled to a drain of the first FET through the first inductor, a gate of the first FET is grounded through the controller, a source of the first FET is grounded, a first terminal of the first capacitor is electrically coupled to a node between the first inductor and the first FET, and a second terminal of the first capacitor is grounded;

    a transformer having a primary and secondary coil, the transformer obtaining the AC power from the DC/AC converting unit, and enlarging the AC power provided by the DC/AC converting unit according to a ratio of turns between the primary coil and the secondary coil;

    a charging antenna obtaining the enlarged AC power from the transformer; and

    a receiving antenna receiving power transmission wirelessly from the charging antenna.

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