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Method for the contactless charging of a battery of an electric motor vehicle

  • US 9,738,166 B2
  • Filed: 03/05/2013
  • Issued: 08/22/2017
  • Est. Priority Date: 03/19/2012
  • Status: Active Grant
First Claim
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1. A method of contactless charging of a battery of an electric motor vehicle by magnetic induction between a resonant transmitter circuit including a transmitter coil of a charging device for contactless charging the battery of the electric motor vehicle and a resonant receiver circuit of the electric motor vehicle including a receiver coil, the electric motor vehicle being positioned above the transmitter coil of the charging device for contactless charging the battery of the electric motor vehicle to provide magnetic coupling between the transmitter coil of the charging device for contactless charging the battery of the electric motor vehicle and the receiver coil of the resonant receiver circuit of the electric motor vehicle, the method comprising:

  • a) controlling electrical power supply and instructions of an inverter to terminals of which the transmitter coil of the charging device for contactless charging the battery of the electric motor vehicle is connected according to a variable frequency;

    b) measuring in an analog circuit at least one analog signal relating to a current or to a voltage across terminals of the transmitter coil of the charging device for contactless charging the battery of the electric motor vehicle;

    c) digitally processing, using a control card, at least two incoming signals, of a first incoming digital signal relating to the voltage and a second incoming digital signal relating to the current, to calculate a phase difference between the current and the voltage; and

    d) transmitting digital output signals from the control card to the inverter to lock the inverter to the calculated value of the phase difference between the current and the voltage.

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