Small signal analysis of power converters involves an investigation of the poles and zeroes in their output transfer function. Stability analysis of the transfer function involves looking at the position that these poles and zeroes occupy in the s-plane. For a stable converter, one condition is that both the zeroes and the poles reside in the left-half of the plane. For some converter architectures, a zero may be the positive root to the numerator of the control-to-output transfer function. How this can happen and the consequences of such a positive zero, also called a right-half-plane zero (RHPZ), is the subject of this 4-part series.
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