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Hybrid direct current link system for a regenerative drive

  • US 10,218,262 B1
  • Filed: 09/25/2017
  • Issued: 02/26/2019
  • Est. Priority Date: 09/25/2017
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, the converter comprising a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus;

    an inverter operatively connected to a motor and the DC bus, the inverter comprising a second plurality of switching devices in selective communication with each phase of the motor and the DC bus; and

    a hybrid DC link system operatively connected between a high side and a low side of the DC bus, the hybrid DC link system comprising a ripple current control branch in parallel with an energy buffering branch, wherein;

    the ripple current control branch comprises at least one film capacitor connected between the high side and the low side of the DC bus; and

    the energy buffering branch comprises;

    one or more electrolytic capacitors with an impedance element between the high side and the low side of the DC bus; and

    a first resistor in parallel with a first electrolytic capacitor of the one or more electrolytic capacitors and a second resistor in series with the first resistor and parallel with a second electrolytic capacitor of the one or more electrolytic capacitors.

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