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Abstract
This paper focuses on the comparative study of analog and digital control techniques for Negative Output Superlift Luo converter (NOSLC). NOSLC is a high gain converter in which the positive source voltage is converted into a negative load voltage. Though the negative load voltage is produced effectively, there is lot of non-linearities that affects the voltage level. To overcome this, analog controllers like Proportional-integral (PI), fuzzy PI and a sliding mode controller (SMC) were proposed for NOSLC. However PI controller does not respond to changes in operating point, fuzzy PI is based on the systematic approach and proved to be a trial and error oriented method and SMC brings an oscillation in the duty cycle. Therefore, to overcome these drawbacks, a digital control technique using PIC microcontroller is proposed in this paper which provides high versatility and programmability approach. Simulation studies are carried out in MATLAB and the performances of these controllers have been investigated for the proposed DC-DC converter. A prototype of the NOSLC converter is built by employing digital control and the results are verified experimentally.
Highlights
The rapid development in DC-DC conversion finds applications in various industries
This paper focuses on PI, fuzzy PI, sliding mode and digital controllers
The PI controller makes the response of Negative Output Superlift Luo Converter (NOSLC) to reach its steady state value after a long interval of time and proved to be a slow response controller
Summary
The rapid development in DC-DC conversion finds applications in various industries. This has led to the production of DC voltage from various converters and here the significance is on the negative voltage. This paper focuses on PI, fuzzy PI, sliding mode and digital controllers These controllers provide a good response thereby bringing the output to a steady state value. A robust method of control is implemented using SMC for uncertainties and other disturbances This control is a time delayed one and brings oscillation in the output voltage with the duty cycle variations. A digital control using peripheral interface controller is implemented which highly helps in reducing the usage of passive components and with an ease to integrate with digital systems.
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