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Power conversion and voltage sag correction with regenerative loads

  • US 7,158,393 B2
  • Filed: 03/11/2005
  • Issued: 01/02/2007
  • Est. Priority Date: 03/11/2005
  • Status: Active Grant
First Claim
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1. A power conversion module comprising:

  • (a) a rectifier having rectifying devices connected to receive AC input power from AC input lines and to provide DC power on high and low DC bus lines;

    (b) first and second energy storage capacitors connected in series across the DC bus lines, the connection between the capacitors defining a common node, a DC bus common conducting line connected to the common node;

    (c) an inverter having inverter switching devices connected to the DC bus lines to receive DC power therefrom, the inverter switching devices switchable to provide AC output power;

    (d) a first bus discharge switching device and a discharge resistor connected in series across the high DC bus line and the common line and connected in parallel with the first energy storage capacitor, and a second bus discharge switching device and a discharge resistor connected in series between the common line and the low DC bus line and connected in parallel with the second energy storage capacitor; and

    (e) a DC bus control circuit connected to the DC bus lines and the common line to receive the voltage therefrom and connected to the first and second bus discharge switching devices to selectively turn the first discharge switching device on for a period of time when the voltage between the high DC bus line and the common line exceeds a selected limit and to turn the second discharge switching device on for a period of time when the voltage between the low DC bus line and the common line exceeds a selected limit, to thereby discharge the energy storage capacitors to reduce the voltage thereon.

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