AC Power line transient suppressing circuit

In combination, AC power terminals, AC load terminals, a capacitor connected in a branch shunting the AC load terminals, an inductor and bi-directional breakdown means connected between the AC power terminals and AC load terminals so that the same current flows from one of the AC power terminals through the inductor and bi-directional breakdown means, said same current being divided to flow in parallel through the AC load terminals and the shunt branch.

A circuit for suppressing transient spikes on an AC power line so as to largely decouple the effects of the spikes from an AC load connected to be driven by current flowing through a terminal of the power line comprising a series branch connected between the power line terminal and a terminal of the load, the series branch including in series an inductor and bi-directional breakdown means having a predetermined threshold conduction level such that it has relatively high and low impedances in response to the voltage across it being respectively less and greater than a threshold conduction level, a shunt branch connected across terminals of the load, the shunt branch and the load connected to the series branch to be responsive to current flowing through the inductor and breakdown means, the load being an impedance that causes a substantial reduction in high frequency components relative to (a) a first suppression circuit having no breakdown means and a low pass filter with a series inductor and a shunt capacitor having the same values as the claimed inductor and capacitor and (b) a second suppression circuit having a bi-directional breakdown means in series with the claimed capacitor and a series inductor and a shunt capacitor having the same values as the claimed inductor and shunt capacitor.