THE ALGORITHM FOR ASYMMETRIC CONTROL OF THE POWER TRANSISTORS IN THE DC-DC CONVERTER WITH SERIES-RESONANT INVERTER FOR SOLAR POWER PLANTS

Designing of DC-DC converters with optimal parameters is a challenging task.

The theoretical part of the paper shows a schematic circuit of the power part of the bridge DC-DC converters under consideration, and describes the operating principle of the power part of the DC-DC converter with a series resonant inverter for solar power plants. With the help of timing diagrams, the features of the symmetrical and asymmetrical control of the power transistors of the converter are explained, and the characteristics that allow comparing the two control methods are explained.

To DC-DC converter control, there are many analogue controllers on serial chips, but they are intended only for implementing symmetrical control. Thus the paper proposes the scheme of algorithm of the asymmetrical transistors control in a series resonant inverter in the form of a virtual model in Matlab-Simulink environment. A few foreign studies currently describe an asymmetrical control method, with only current waveforms of the resonant circuit and control voltages on the gates of the converter’s MOSFET transistors, as well as a block diagram of the control system. Therefore, the algorithm of asymmetrical control described in this paper is original, and the results of the research are new in comparison with existing world practices.

The experimental part of the paper presents the simulation results (transient, steady-state, external characteristics, dependencies for converter’s efficiency). The obtained characteristics agree with the results of theoretical calculations shown in previous papers of the authors. 

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