Abstract <p>The paper presents a retrospective review of the design methods for linear feedback loops of a pulse voltage converter using various methods of transition from a nonlinear pulse voltage converter to a linear model. These methods allow the use of frequency stability criteria that are most convenient and pictorial for engineering analysis. The importance of correct determination (calculation and measurement) of the pulse voltage converter loop gain for determining the stable operating mode of the pulse voltage converter, as well as the importance of correct determination (calculation and measurement) of the frequency characteristics of various loops of the loop gain of the pulse voltage converter with multi-loop feedback are shown.</p>