Converter sensitivity to load imposed instability and performance degradation

The paper studies the stability and performance analysis of a regulated converter based on the impedance ratio known commonly as minor-loop gain. System theory is used to prove that the minor-loop gain can be addressed to the internal stability of an interconnected system in a scientifically sound manner. As a consequence, the output impedance of the source system can be used to specify the stability boundary of the source converter in respect to the load impedance. The margins assigned to the minor-loop gain do not, however, coincide with the margins associated to the loop gain of the converter, and therefore, the converter performance may be deteriorated unless the minor-loop gain margins are sufficient for avoiding that. Experimental evidence is provided to support the ideas presented in the paper