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Feed unit including power transmission coil and feed system

  • US 9,954,397 B2
  • Filed: 03/06/2014
  • Issued: 04/24/2018
  • Est. Priority Date: 04/08/2013
  • Status: Active Grant
First Claim
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1. A feed unit comprising:

  • a power transmission coil configured to transmit power to a power reception coil of a receiving unit using a magnetic field;

    a coupling coefficient calculation section configured tomeasure frequency characteristics of input impedance of a rectification circuit of the receiving unit, the rectification circuit being in a non-operating state, andcalculate a coupling coefficient between the power transmission coil and the power reception coil using the frequency characteristics of the input impedance of the rectification circuit that have been measured; and

    an AC signal generation section configured to supply an AC signal to the power transmission coil, wherein the AC signal generation section and the rectification circuit are in non-operating states when the frequency characteristics are measured by the coupling coefficient calculation section, whereinthe coupling coefficient calculation section includesa measurement signal generation section configured to generate a measurement signal to measure the frequency characteristics,a current detection section configured to detect a current flowing through the power transmission coil,a control section configured to control a voltage and a frequency of the measurement signal, anda calculation section configured to calculate the input impedance based on the current detected by the current detection section and the voltage that is set by the control section,wherein the control section is configured to continuously vary the frequency of the measurement signal, andwherein responsive to the control section continuously varying the frequency of the measurement signal, the calculation section is configured to obtain the frequency characteristics.

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