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The output voltage of DC-DC converter contains the ripple and it substantially affects the frequency response although the ripple is usually neglected in the control circuit as PWM control. The authors already have clarified that the effect of the ripple is not ignorable for the frequency response and it causes the unusual characteristics. In this paper, we analyze the effect of the ripple in consideration...
In this paper we clarify for the buck-boost converter that the ripple effect is not ignorable for the frequency response, and reveal that it causes the unexpected characteristics where either the phase lag or the phase lead appears depending on the shape of the ramp generator of the PWM circuit. Eventually the phase margin for the stability drastically changes depending on the slope direction (normal...
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