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Power transfer system

  • US 9,929,585 B2
  • Filed: 09/03/2015
  • Issued: 03/27/2018
  • Est. Priority Date: 09/03/2014
  • Status: Active Grant
First Claim
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1. A power transfer system for transferring power from an AC supply outputting a first AC voltage comprising;

  • a controller,a matrix converter having a positive primary coil node and a negative primary coil node and defining a first primary node and a second primary node and coupled to the AC supply for converting the first AC voltage to a second AC voltage,a primary coil connected between said positive primary coil node and said negative primary coil node of said matrix converter for producing an alternating magnetic field in response to receiving the second AC voltage from said matrix converter,a secondary coil in communication with said primary coil for producing an induced AC voltage in response to receiving the alternating magnetic field from said primary coil,a secondary rectifier connected to said secondary coil for rectifying the induced AC voltage from said secondary coil to produce a secondary DC voltage,characterized bysaid matrix converter including a first bidirectional switching module coupled to said controller and connected between said first primary node and said positive primary coil node and a second bidirectional switching module coupled to said controller and connected between said positive primary coil node and said second primary node,said controller configured to control said first bidirectional switching module and said second bidirectional switching module of said matrix converter to produce the second AC voltage at a desired level and at a desired output operating frequency and maintain the secondary DC voltage at a predetermined level,said secondary rectifier being of the voltage doubling type and having a positive secondary coil node and a negative secondary coil node and defining a first secondary node and a second secondary node and including a first rectifier diode coupled to said secondary coil and connected to said first secondary node and a second rectifier diode connected to said second secondary node and coupled to said secondary coil at said positive secondary coil node and including a first rectifier capacitor connected between said first secondary node and said negative secondary coil node and a second rectifier capacitor connected between said negative secondary coil node and said second secondary node for rectifying and doubling the induced AC voltage from the secondary coil to produce the secondary DC voltage, anda first primary coil tuning capacitor connected between said first primary node and said negative primary coil node and a second primary coil tuning capacitor connected between said second primary node and said negative primary coil node and a secondary coil tuning capacitor connected between said secondary coil and said positive secondary coil node for tuning resonance between said primary coil and said secondary coil.

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