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Medium frequency energy supply for rail vehicles

  • US 7,102,901 B2
  • Filed: 01/28/2002
  • Issued: 09/05/2006
  • Est. Priority Date: 01/27/2001
  • Status: Expired due to Term
First Claim
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1. An electronic circuit for bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, comprising:

  • a resonance circuit including a common transformer and a capacitor array, the common transformer including a plurality of primary windings and a single secondary winding;

    a single secondary converter connected to the single secondary winding; and

    a primary converter including at least three primary converter sections connected in series, output lines of each of the at least three primary converter sections being connected to a respective one of the plurality of primary windings of the common transformer, each primary winding of the common transformer being allocated one resonance capacitor, the resonance capacitors forming an oscillating circuit with a leakage inductance coil of the common transformer,wherein the capacitor array includes a symmetrical magnetic and electric structure for lossless switching operation, and wherein the transformer, the capacitor array, and a respective resonance frequency and switching frequency are selected such that each of the primary converter sections are decoupled, and wherein for a resonance frequency, a ratio of impedances of the leakage inductance coil to the capacitor array is chosen so that an effective value of an alternating voltage of at least one of the capacitors in nominal operation is at least ⅓

    of a no-load voltage of a transformer of a primary winding.

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