Steady-state analysis of PWM tapped-inductor buck DC-DC converter in CCM

This paper presents the steady-state analysis of a pulse-width modulated tapped-inductor buck dc-dc converter operating in continuous-conduction mode. The steady-state waveforms are presented. The steady-state voltage gain is derived. The minimum inductance required for converter operation in CCM is derived. The expressions for the power losses in each converter component and hence, the overall efficiency of the converter are determined. The expression to estimate the filter capacitance is presented. A design example of the tapped-inductor buck converter with supply voltage 12 V, output voltage 5 V, and output power 10 W is given. Simulation results are provided to verify the correctness of the theoretical predictions.