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Efficient power transmitting terminal, contactless power transmission device and power transmission method

  • US 10,186,908 B2
  • Filed: 07/06/2016
  • Issued: 01/22/2019
  • Est. Priority Date: 08/04/2015
  • Status: Active Grant
First Claim
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1. An efficient power transmitting terminal, transmitting energy to its isolated power receiving terminal, comprising:

  • a DC-AC voltage converter configured to receive a DC voltage to output an AC voltage with a preset frequency, the DC-AC voltage converter comprising a first switching tube and a second switching tube connected in series;

    a power transmitting portion, comprising a primary transmitter coil, wherein the primary transmitter coil receives the AC voltage to generate an alternating magnetic field, to transmit energy to the power receiving terminal; and

    a soft-switching control circuit, connected between the DC-AC voltage converter and the power transmitting portion, and configured to adjust an equivalent output impedance of the DC-AC voltage converter, so that the equivalent output impedance is inductive impedance;

    wherein the preset frequency is consistent with a system operating frequency at the power transmitting terminal and the power receiving terminal;

    wherein the soft-switching control circuit consists of a first inductor, and two ends of the first inductor are connected to a common connection point of the first and the second switching tubes and the power transmitting portion respectively; and

    an inductance value of the first inductor and a dead-time between the first and second switching tubes are adjusted to achieve a zero-voltage switching-on of the first and second switching tubes.

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