Modeling And Simulation Of Boost Switching Converter Based On Digital Current Programmed Control

With the rapid development of electronic technology, electronic equipments have closerelations with people’s working and living. The power supply is an important part ofelectronic products. The switching power supply has become the mainstream of supplybecause of its low power consumption, high efficiency, small size and light weight. Theswitching power converter is a core part of the switching power supply. It is a typicalswitching linear hybrid and non-linear system in essence. Its modeling, control mode,simulation has been an important part of the power electronics research field. In recent years,digital control technology has been widely used in switching converters because of its simpleand reliable circuit, easy communication and monitoring, flexibility and other advantages, aswell as the upgrade of digital signal processor’s cost-effective. Various digital discrete-timemodeling methods have been proposed, but most of these methods are based on voltage-modesingle-loop control. In fact, the current-mode dual-loop control method has a better dynamicresponse and robustness than the voltage mode control and is applied widely in engineering.Therefore, using the peak current digital control DC-DC switching converter as the researchobject of this paper has a more general and practical value.This paper’s purpose is to build the discrete-time model of Boost switching converter withdigital peak current mode control. Firstly, it introduces the research background andsignificance of the switching converter, the development of switching converter modelingmethod and the advantages of digital control. Secondly, we discuss the voltage mode controland peak current mode control, analyzes the principle of Boost Switching Converter withdigital peak current mode control. Thirdly, we use state space averaging method and circuitaveraging method respectively to solve the open-loop transfer function and AC small-signalmodel of Boost converter. Finally, by analyzing the transfer function of the equivalent powerof Boost switching converter with circuit peak current mode control, and considering thefactor of the zero-order hold，we deduce the discrete-time model of Boost switching converterwith digital peak current mode control. Simulink simulation tool is applied to verify theeffectiveness and feasibility of this approach.