Dynamical effects of memristive load on peak current mode buck-boost switching converter

When an output load of switching DC-DC converter exhibits the fingerprints of frequency dependent pinched hysteresis loops, the load can be regarded as a memristive load. By substituting a resistive load with the voltage-controlled memristive load emulator, a peak current mode (PCM) memristive buck-boost converter is presented in this paper. Based on the circuit equations under two kinds of switch states, the switched conditions and normalized system model of the PCM memristive buck-boost converter operating at continuous conduction mode (CCM) are derived. Through MATLAB numerical plots, dynamical behaviors of the PCM memristive buck-boost converter are investigated and dynamical effects of the memristive load on the buck-boost converter are thereby uncovered. The results indicate that such a buck-boost converter exhibits complex dynamical behaviors including chaos, period, period-doubling bifurcation, and border collision bifurcation; the memristive load does not affect the bifurcation structures but can make the normal operation region to broaden and cause the average output voltages to drop. Additionally, the enlargement of the memristive effect of the load, the normal operation regions are further expanded and the average output voltages are further reduced. Finally, PSIM simulation model is constructed, upon which circuit simulations effectively confirm the numerical plots. (C) 2019 Elsevier Ltd. All rights reserved.