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Inductive power transfer system

  • US 9,351,359 B2
  • Filed: 12/13/2013
  • Issued: 05/24/2016
  • Est. Priority Date: 12/14/2012
  • Status: Active Grant
First Claim
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1. An inductive power transfer system, comprising a primary side unit and a secondary side unit, the primary side unit having a switched mode power supply (SMPS), a transmission coil and a controller, and the secondary side unit having a receiver coil, a controller and a load, wherein the secondary side controller is configured to detect the voltage in the receiver coil and to transmit to the primary side controller a control signal requesting an increase or decrease in the power transmitted from the primary side according to whether the voltage in the receiver coil is above or below a predetermined value, and wherein the primary side controller is configured to set an initial operating frequency of the SMPS, on start-up, bya) setting the operating frequency to a maximum value and gradually reducing the frequency until a control signal is received from the secondary side unit;

  • b) setting the secondary load to zero and determining the secondary voltage;

    c) determining the operating frequency required to achieve the desired voltage in the secondary unit under a predetermined load; and

    d) configuring a control loop speed according to the operating frequency determined in step c).

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