Output impedance of peak current-mode controlled PWM DC-DC converters with only inner loop closed in CCM

Different control loops employed in regulating deck converter outputs may have an effect on the output impedance of the converter. In this manuscript, the effect of the inner-current loop on the output impedance of a peak current-mode controlled PWM dc-dc converter with the outer-voltage loop open is investigated. Closed-loop output impedance including feed-forward gains with inner-current loop closed and outer-voltage loop open for peak-current mode controlled PWM dc-dc converters operating in CCM is derived. Bode plots of the closed-loop output impedance for PCM controlled PWM dc-dc buck and boost converters with inner-current loop only are illustrated using MATLAB simulations and are compared with the Bode plots of respective open-loop output impedances.