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Systems and methods for limiting current inrush in electric drive systems

  • US 9,407,134 B2
  • Filed: 04/08/2014
  • Issued: 08/02/2016
  • Est. Priority Date: 12/11/2013
  • Status: Active Grant
First Claim
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1. A variable speed drive comprising:

  • a converter which converts received AC power to DC power;

    one or more capacitor banks coupled to the converter, wherein the DC power produced by the converter charges the one or more capacitor banks; and

    an inverter connected to the one or more capacitor banks, wherein the inverter inverts DC power from the one or more capacitor banks, thereby producing an AC output waveform;

    wherein the converter includes an upper junction which is electrically connected to a first input of the one or more capacitor banks and a lower junction which is electrically connected to a second input of the one or more capacitor banks; and

    wherein the converter includes first, second and third converter sections, wherein each of the first, second and third converter sections includesfirst and second rectifier components that are electrically connected in series between the upper junction and the lower junction, wherein at least one of the first and second rectifier components is a controlled rectifier,first and second switches, wherein the first switch is electrically connected in parallel with the first rectifier component, and wherein the second switch is electrically connected in parallel with the second rectifier component, andan inductor having a first end electrically connected to an intermediate junction between the first and second rectifier components and a second end electrically connected to a corresponding one of three phases of a three-phase power source.

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