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Device and method for line-voltage dependent thyristor controlled pre-charging of output capacitors in a three-level pulse rectifier system

  • US 6,377,482 B1
  • Filed: 05/04/2001
  • Issued: 04/23/2002
  • Est. Priority Date: 05/17/1999
  • Status: Expired due to Term
First Claim
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1. Apparatus for initial charging of the output capacitors of a three-phase, three-point pulsed rectifier system which has, in a conventional configuration in each phase, a single-phase diode bridge, a power transistor, a series inductance and freewheeling diodes, characterized in that, in each phase, that diode in the single-phase diode bridge which is connected on the anode side to the input terminal and on the cathode side to the anode of the freewheeling diode connected to the positive output voltage rail in the current flow direction is replaced by a thyristor of the same polarity and, arranged in parallel with this thyristor, an initial charging path, comprising a series circuit formed by a series resistor and a diode, pointing in the same current flow direction as the thyristor.

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