Closed-form subharmonic oscillation conditions are derived and experimentally verified for the current-controlled boost converter in continuous conduction mode with closed voltage feedback loop. Typical voltage-loop phase-lag and type-II compensators are analyzed. The well-known open-voltage-loop instability condition becomes a special case. It is found that, unlike in the buck converter, the ripple at the output of the compensator can improve the stability. The analysis is extended to other boost-like converters with pulsating output currents, such as buck-boost, flyback, and SEPIC converters.
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Fang et al. (2016) studied this question.
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