Current stiff converters with resonant snubbers

  • US 5,949,664 A
  • Filed: 06/18/1998
  • Issued: 09/07/1999
  • Est. Priority Date: 06/19/1997
  • Status: Expired due to Term
First Claim
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1. A current stiff power conversion system, comprising:

  • (a) a bridge of power conversion switching devices connected across DC bus lines and responsive to power conversion switching device control signals;

    (b) a snubber capacitor connected across each of the power conversion switching devices;

    (c) an active commutation unit connected across the DC bus lines in parallel with the bridge of power conversion switching devices and responsive to active commutation switching control signals; and

    (d) controller means for providing the power conversion switching device control signals to the power conversion switching devices and the active commutation switching control signals to the active commutation unit such that the power conversion switching devices are controlled to turn on and off under approximately zero voltage switching conditions and to create a zero current switching condition for the active commutation unit and such that the active commutation unit is controlled to turn on and off under said zero current switching condition to establish a resonance between the snubber capacitors and the active commutation unit to establish said approximately zero voltage switching conditions.

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