| 摘要 |
An electronically enhanced filter and method for suppression of transient impulses in a power distribution system having a power line (36) and neutral line (38). The filter includes a normal mode filter (62) having an inductor (50) located on the power line and an inductor (52) located on the neutral line between a line and a load of the power distribution system, and a pair of capacitors (66, 68) arranged in series and connected between the power and neutral lines, whereby a midpoint tap (72) is formed between the pair of capacitors. The filter also includes a common mode filter (64) which is formed by the inductor (50) on the power line, the inductor (52) on the neutral line, and an impulse capacitor (70) connected at one end to the midpoint tap and at the other end to ground (40). Also included, is an electric trigger comprised of an impulse detector and a switch. The electric trigger is located between the impulse capacitor and ground, whereby the switch being normally open and configured to close upon detection of the transient impulse at the midpoint tap so as to attenuate the transient impulse by conducting it to ground.
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