A Loss Modeling Method of Buck Converter with Different Control Methods

Abstract

As one of the core devices of DC power grid, the performance of DC transformer will have a great impact on the application effect of DC power grid. At present, in order to adapt to the high-power and high-frequency conditions of DC transformer application, scholars have carried out a lot of research on topology optimization and control methods of DC transformer. In order to provide theoretical basis for device selection, topology selection and control optimization of DC transformer, it is necessary to study the loss modeling method. This paper first introduces the topology of buck converter circuit. The operation mode and advantages and disadvantages of the low current and high current ripple control methods are described in detail. Based on the above analysis, the loss causes and modeling methods of the circuit are studied, the loss models of the two control methods are established, and the LTSPICE simulation model is built to verify the theoretical results. Finally, the experimental verification of the above theoretical model is completed, and the effectiveness of the control method and theoretical modeling is verified by the measured waveform and efficiency.