The new ELCA current Rectifier digital type

Main functions:
(Programming / SCR firing control and output regulation / Parameter and Alarm Indication / Interfacing with external PC or PLC) are controlled by a fully digital system

Current rectifier for plating Remote control panel
Ripple factor vs. DC output voltage in six-phase rectifiers circuit with SCR control (with and without smoothing device)

The ripple value is given by the percent ratio between the rms value of all harmonics of AC component and the average value of the DC output.
The AC component superimposed to DC output voltage can be measured, according to IEC recommendations, by an AC voltmeter indicating the true rms value parallel connected to output DC bars.

Therefore the ripple value is given by:

Where : Vrms = rms value of ripple voltage
VDC = actual output average direct voltage

It must be observed that the ripple value is not constant, but itincreases if the output voltage decreases (according to the enclosed diagram).