Comparative Study of the Performance for some Power DC-DC Converters; Design and Implementation
Keywords:
Boost Converter, SEPIC Converter, Discontinuous conduction mode, Design, Analysis, Duty cycle, Switching frequencyAbstract
The present study focuses on the performance analysis of the basic (boost) and advanced (SEPIC) power DC-DC converters operating in the discontinuous conduction mode (DCM). Parameters such as switching signal frequency (fs), duty cycle (D), and DC input voltage (Vin) are investigated to study their influence on the output voltage (Vo) of the converters. Results show that the SEPIC converter is more efficient than the Boost converter with higher output voltage values obtained at different Vin levels. Where, the obtained output voltage values were 5.5 V and 5.6 V at Vin of 1.5 V, which mean that the increasing ratio of the output voltage of SPEIC over Boost converter was about 18.2 %. Similarly, its value was reported to be, 42.2 V and 48.6 V, measured at Vin of 10 V, causing the increasing ratio of SEPIC converter to be about 15.16 % relative to the Boost converter. Concerning the dependence of their output voltage on the switching duty cycle, it was noticed that the increasing ratio of the output voltage of SEPIC over Boost converter ranges from 19.3 % to 30.8 % depending on the duty cycle. The effective operating bandwidth (BW) of the output voltage is wider for the SEPIC converter compared to the Boost converter. The switching frequency has an effect on the output voltage of the converter, with the SEPIC converter showing a wider operating bandwidth compared to the Boost converter (8 kHz).
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