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Voltage sag and over-voltage compensation device with pulse width modulated autotransformer

  • US 6,559,562 B1
  • Filed: 03/06/2002
  • Issued: 05/06/2003
  • Est. Priority Date: 12/14/2001
  • Status: Expired due to Fees
First Claim
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1. A device for selectively receiving electric power from an AC power source oscillating at a system frequency, adjusting the voltage of the power, and delivering a corresponding voltage-corrected AC power supply to a load connected across an upper pole and a neutral pole of the device;

  • comprising;

    an autotransformer having;

    a first winding around a flux linking core and connected between the neutral pole and a center pole;

    a second winding around the flux linking core and connected between the center pole and the upper pole;

    a center-pole switch for selectively connecting the AC power source between the neutral and center poles when the center-pole switch is gated to a closed configuration, and for selectively disconnecting the AC power source from connection between the neutral and center poles when the center-pole switch is gated to an open configuration; and

    a control unit for selectively gating the center-pole switch between the open configuration and the closed configuration multiple times per cycle of the system frequency to generate the voltage-corrected AC power supply for delivery to the load.

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