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Transformerless conditioning of a power distribution system

  • US 5,666,255 A
  • Filed: 06/05/1995
  • Issued: 09/09/1997
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Term
First Claim
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1. An electrically enhanced filter for suppressing transient impulses in a power distribution system having a power line and a neutral line referenced to ground, the filter comprising:

  • a normal mode filter having an inductor located on the power line and an inductor located on the neutral line between a line and a load of the power distribution system, and a pair of capacitors arranged in series and connected between the power and neutral lines, whereby a midpoint tap is formed between said pair of capacitors;

    a common mode filter being formed by said inductor on the power line, said inductor on the neutral line, and an impulse capacitor connected at one end to said midpoint tap and at the other end to ground; and

    an electronic trigger comprised of an impulse detector and a switch, said electronic trigger being located between said impulse capacitor and ground, whereby said switch being normally open and being configured to close upon detection of the transient impulse at said midpoint tap so as to attenuate said transient impulse and conduct it to ground.

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