Analytical method for determining the switching time of the combined converter with output voltage, providing single-cycle mode

Authors: Apasov V. I., Mihalchenko S. G., Tanovitskiy Yu. N.

Annotation: A model of the combined converter, based numerical-analytic method of mathematical modeling of the dynamics of semiconductor converters capable of operating as both a buck- and boost-converter, are proposed. This converter provides the same polarity of the input and output voltages and the possibility of obtaining an output voltage as an input over and less at lower losses on the elements and the nominal current through the transistors and diodes, in comparison with the pulse converters with isolating capacitor. Mathematical model of the combined converter enables you to carry it: to study the nonlinear dynamic properties, perform the bifurcation analysis, and search duration of control pulses of switching elements in which the inverter will run in a stable mode. Bifurcations of the output voltage depending on the gain control circuit. The analytical method for finding singlecycle modes of operation of the combined converter. The data obtained can be used in the design of power electronic devices based on this type of converter, in particular in the design of systems of power modules spacecraft to ensure stable operation to the gradual degradation of the circuit components.

Keywords: mathematical modeling, combined converter, switching function, bifurcation analysis, the time of switching