Apparatuses, systems, and methods for a monotonic transfer function in wireless power transfer systems
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United States of America Patent
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Sep 29, 2015
Grant Date -
Aug 29, 2013
app pub date -
Feb 23, 2012
filing date -
Feb 23, 2012
priority date (Note) -
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Abstract
A wireless power-transfer system includes a power-transmitting device and a power-receiving device. A frequency generator generates a power-transmit frequency to stimulate transmit coil and transmit resonance adjuster, which generate a near-field electromagnetic radiation at an adjustable coupling frequency. The power-receiving device includes a receive coil and a receive resonance adjuster for receiving the near-field electromagnetic radiation when the receive coil is within a coupling region of the transmit coil. The receive resonance frequency may be modified by the receive resonance adjuster. In the wireless power-transfer system, one or both of the transmit resonance adjuster and the receive resonance adjuster is configured to adjust its corresponding frequency to be sufficiently less than the power-transmit frequency such that a monotonic transfer function is developed between the power-transmit frequency and the receive resonance frequency.
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