Importance

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Abstract

Spikes occurring on an AC line and coupled through an AC to DC converter are substantially decoupled from a DC load of the converter even though the converter includes a supply transformer and a shunt electrolytic filter capacitor, by a circuit comprising a shunt network including a bidirectional breakdown means having a predetermined threshold conduction level with a dead band series connected with a capacitor. The capacitor is a low impedance capacitive reactance to high frequency components in pulses developed by the converter in response to the spikes, and a high impedance to ripple of the line derived by the converter. The high frequency components are supplied by the breakdown means to and through the capacitor to momentarily interrupt the flow of current from the converter to the load when the pulses are derived. A low pass filter connected in series with the shunt network and the load has a cut-off frequency lower than the ripple frequency.

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First Claim