(1) Maximum ripple voltage
The magnitude of the absolute pair value of the output voltage ripple (including noise) at rated output voltage and load current, usually expressed as a peak or an effective value.
(2) Ripple coefficient Y(%)
At rated load current, the ratio of RMS of output ripple voltage to Uo of output DC voltage, namely Y=Umrs/ UOX100%.
(3) Ripple voltage suppression ratio
At a specified ripple frequency (such as 50HZ), the ratio of the ripple voltage Ui ~ in the input voltage to the ripple voltage Uo ~ in the output voltage, i.e., the ripple voltage suppression ratio =Ui ~ /Uo ~.

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