Converter Technology

Waveform RMS Equations

This page gives the RMS and average values of some of the current waveforms commonly found in switching power supplies. In all cases here, the parameter k represents the ratio of t a/T shown in the waveform diagrams. All the waveforms are time periodic representing constant frequency operation.

Download a summary of the most common equations here:-

Waveform RMS Equations.pdf

All equations are calculated using:

Trapezoidal Current

Trapezoidal Current Waveform

Triangular Current

Triangular Current Waveform

Inductive Current

Offset Trapezoidal Current

Offset Trapezoidal Current Waveform

Offset Triangular Current

Offset Triangular Current Waveform