# residual ripple

The ripple is defined as the percentage residual component of an AC voltage

superimposed on the rectified and smoothed DC voltage. The residual ripple is a dimensionless value which is calculated from the quotient of the superimposed residual voltage to the DC voltage. The residual ripple is given as a percentage.

residual ripple When a sinusoidal AC voltage is rectified, a semi-sinusoidal AC voltage is produced. To make a DC voltage out of this, this voltage is smoothed with filter elements. Regardless of the effort of the filter circuit, a residual AC voltage component always remains on the smoothed DC voltage. This superimposed AC voltage is used to determine the residual ripple.