Simulation and DSP based implementation of conventional controller for double output elementary LUO converter

摘要

Mirror-symmetrical double-output voltages are specially required in industrial applications and computer periphery circuits. Double output DC-DC converters can convert the positive input source voltage to positive and negative output voltages by two conversion paths. Because of the effect of parasitic elements, the output voltage and power-transfer efficiency of DC-DC converters are limited. The voltage-lift technique is a popular method that is widely applied in electronic circuit design. This technique gives a good way of improving circuit characteristics and has been successfully applied for DC-DC converters. As are single output (positive or negative output), double-output converters are a series of new DC-DC converters using only one switch. These converters perform from positive to positive and negative DC-DC voltage conversion with high power density, high efficiency and cheap topology in a simple structure. They are different from any other existing DC-DC converters and possess many advantages including high output voltage with small ripples. Therefore these converters will be widely used in computer peripheral equipment and industrial applications, especially for high double-output voltage projects. MATLAB (version 7.01) software and TMS320LF2407 digital signal processor (DSP) are used to study the dynamic characteristics and analyze the closed loop performances of these converters with resistive load under supply and load disturbances. The simulation and experimental results closely match with each other and highlight the feasibility and validity of the developed control scheme.