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Wireless power transmission audio system and device on transmitting end and loudspeaker for use in such a system

  • US 8,929,563 B2
  • Filed: 12/19/2011
  • Issued: 01/06/2015
  • Est. Priority Date: 12/22/2010
  • Status: Expired due to Fees
First Claim
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1. A wireless power transmission audio system comprising:

  • a device on a transmitting end; and

    a loudspeaker which is associated with the device on the transmitting end, the wireless power transmission audio system being configured to transmit electric power and an audio signal wirelessly from the device on the transmitting end to the loudspeaker,wherein the device on the transmitting end includes;

    a transmission signal generating circuit configured to generate a transmission signal which is comprised of an RF signal for use to transmit the electric power and the audio signal;

    a first resonant circuit which receives and sends out the transmission signal and a resonant frequency of the first resonant circuit is equal to a frequency of the RF signal;

    a detecting circuit configured to sense a variation in the transmission signal; and

    a transmission signal adjusting circuit configured to control a signal waveform of the transmission signal, andwherein the loudspeaker includes;

    a second resonant circuit, which receives at least a part of the transmission signal that has been sent out by the first resonant circuit, where the first resonant circuit and the second resonant circuit are coupled with each other by a magnetic resonant coupling phenomenon or an electric field resonant coupling phenomenon at the resonant frequency when the second resonant circuit receives the at least a part of the transmission signal; and

    an audio output circuit configured to reproduce the audio signal in accordance with a signal supplied from the second resonant circuit, andwherein at least one of the device on the transmitting end and the loudspeaker includes an impedance adjusting circuit which is connected to the first or second resonant circuit and which changes an impedance value on a transmission line of the transmission signal according to the variation of the transmission signal that has been sensed by the detecting circuit, andwherein, when the impedance adjusting circuit changes the impedance value, the transmission signal adjusting circuit changes a signal waveform of the transmission signal at the device on the transmitting end.

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