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Wireless power supply system and power transmission device

  • US 9,776,522 B2
  • Filed: 09/26/2013
  • Issued: 10/03/2017
  • Est. Priority Date: 09/26/2013
  • Status: Active Grant
First Claim
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1. A wireless power supply system comprising a power transmission device provided on a ground side and having a power transmission coil and a power receiving device mounted on a vehicle and having a power receiving coil, the power transmission device transmitting, to the power receiving device via a wireless connection, electric power controlled by an inverter provided in the power transmission device,the power receiving device transmitting a power supply command signal to the power transmission device in a first cycle by use of a radio signal,the power transmission device including a storage section for storing the power supply command signal transmitted from the power receiving device and a power transmission coil current detection section for detecting a power transmission coil current flowing through the power transmission coil,wherein the power transmission device controls an output voltage of the inverter based on the power supply command signal and the power transmission coil current detected by the power transmission coil current detection section in a second cycle shorter than the first cycle, andthe power transmission device controls the output voltage of the inverter by use of the power supply command signal previously transmitted and stored in the storage section when the power transmission device cannot receive another power supply command signal via current communication.

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