>
>
> > I did that in a printer design, wasn't hard.  Basically, take a "light
> > dimmer" sort of circuit, and apply the output of a voltage comparator,
> so
> > that if your voltage is high enough, you skip the next
> half-cycle.  Bridge
> > rectifier on the front end, and SCR between that and the filter cap.
>
> Maybe the SCR in front of the bridge on the AC path, or two thyristors
> as half bridge and two diodes as other half bridge. Else how you fired
> off the SCR as long there is no zero cross (or lower than sustaining
> current of the SCR) current on the filter capacitor ?



The SCR turns off when the output of the bridge won't keep enough current
into the filter cap.
There is not a zero-cross on the output of the bridge, but output current
DOES go to zero every half-cycle.
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