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Wireless power transmission system

  • US 10,312,742 B1
  • Filed: 10/08/2018
  • Issued: 06/04/2019
  • Est. Priority Date: 10/08/2018
  • Status: Active Grant
First Claim
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1. A wireless power transmission system, comprising:

  • a wireless power transmitter having;

    a DC power supply having positive and negative terminals;

    first and second banks of MOSFET amplifiers, each of the banks having a plurality of MOSFET power transistors configured in parallel, each of the banks having a corresponding drain bus connecting drains of each of the plurality of MOSFET power transistors included in the bank and a corresponding gate bus connecting gates of each of the plurality of MOSFET power the transistors included in the bank;

    a transmitting coil and at least one capacitor connected in parallel to the transmitting coil, the transmitting coil and the at least one capacitor defining an LC tank circuit having a transmitter resonant frequency, the LC tank circuit having opposite sides, wherein the opposite sides are connected across the terminals of the DC power supply, the drain buses of the first and second banks of MOSFET amplifiers being connected to opposite sides of the tank circuit, respectively; and

    a first diode connected between the gate bus of the first bank of MOSFET amplifiers and the drain bus of the second bank of MOSFET amplifiers, and a second diode connected between the gate bus of the second bank of MOSFET amplifiers and the drain bus of the first bank of MOSFET amplifiers, the first and second diodes being configured to alternately turn the first and second banks of MOSFET amplifiers on and off at the transmitter resonant frequency; and

    a wireless power receiver having;

    an inductor and a capacitor in parallel with the inductor, the inductor and the capacitor defining a tuned circuit having a receiver resonant frequency, the receiver tuned circuit having a bandwidth at least partially overlapping a bandwidth of the wireless power transmitter'"'"'s LC tank circuit, the tuned circuit receiving power transmitted by the wireless power transmitter'"'"'s transmitting coil;

    a rectifier connected to the tuned circuit;

    a voltage regulating circuit connected to the rectifier; and

    a power connector connected to the voltage regulating circuit for connecting rectified and voltage-regulated power from the wireless receiver to a charging circuit of an electronic device.

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