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Wireless power transmission circuit

  • US 10,164,470 B2
  • Filed: 10/26/2016
  • Issued: 12/25/2018
  • Est. Priority Date: 08/01/2013
  • Status: Active Grant
First Claim
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1. A wireless power transmission circuit comprising:

  • an oscillator;

    a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal;

    a power transmission coil configured to transmit AC power converted by the DC-AC converter;

    a signal reception coil; and

    a signal receiver configured to detect a voltage change across a first terminal and a second terminal of the signal reception coil and provide the control signal based on the detected voltage change,wherein the DC-AC converter comprises;

    a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage;

    a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage;

    a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal;

    a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and

    a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state.

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