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Contactless power transmission circuit

  • US 9,728,979 B2
  • Filed: 11/26/2014
  • Issued: 08/08/2017
  • Est. Priority Date: 11/28/2013
  • Status: Active Grant
First Claim
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1. A contactless power transmission circuit for transmitting a power via a magnetic field from a power transmitting coil to a power receiving coil, comprising:

  • a driving circuit for supplying an alternating voltage to the power transmitting coil,a rectifier circuit for rectifying a voltage generated in the power receiving coil with a magnetic field generated by the power transmitting coil,a transmission current detecting circuit for detecting a transmission current flowing through the power transmitting coil,an output voltage detecting circuit for detecting an output voltage of the rectifier circuit, anda control circuit for controlling a period of the alternating voltage output from the driving circuit,wherein the control circuit is set to calculate a first command value and a second command value which are command values for the period of the alternating voltage, and use a smaller one of either of the first command value and the second command value as a command value for the period of the alternating voltage,the first command value is a command value based on a difference between a detected value of the output voltage detected by the output voltage detecting circuit and a target value of the output voltage, and the second command value is a command value calculated based on a difference between a detected value of the transmission current detected by the transmission current detecting circuit and a target value of the transmission current.

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