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Controlling a contactless energy transmission by means of a characteristic of a resonant circuit

  • US 9,715,962 B2
  • Filed: 05/21/2012
  • Issued: 07/25/2017
  • Est. Priority Date: 06/07/2011
  • Status: Active Grant
First Claim
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1. A circuit for transmitting an input voltage from an electrical energy source in a stator to a load within a device movable relative to the stator, the circuit comprising:

  • an actuating element configured to convert an input voltage into a transmission voltage;

    a resonant circuit configured to receive the transmission voltage, wherein the resonant circuit includes a capacitance and a primary winding of a transformer; and

    a memory configured to store a plurality of control characteristic values based on a measurement of transmission ratios of the resonant circuit,wherein the transformer comprises the primary winding and a secondary winding, wherein the primary winding is configured to transmit the transmission voltage to the secondary winding and the secondary winding is configured to deliver the received transmission voltage as an output voltage to the load, andwherein the actuating element is configured to adjust the frequency of the transmission voltage based on the plurality of control characteristic values such that the transmission ratio of the resonant circuit remains essentially constant between the transmission voltage and the output voltage for a predetermined load range of the load.

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