Abstract
Nowadays in modern industrial applications, where the power supply efficiency is more important than the output noise performance, DC-DC converters are widely used in order to fulfill the requirements. Yet, component selection and precise estimation of parameters can improve the converter’s performance, leading to smaller and more efficient designs. Hence, metaheuristic optimization algorithms can be applied using the mathematical model of DC-DC converters, in order to optimize their performance through an optimal inductance selection. Therefore, this work presents a novel design methodology for DC-DC converters, where the inductance selection is optimized, in order to achieve an optimal relation between the inductance size and the required energy. Moreover, a multi-objective metaheuristic optimization is presented through the Earthquake Algorithm, for parameter estimation and component selection, using the inductance of a buck DC-DC converter as a case study. The experimental results validate the design methodology, showing ripple improvement and operating power range extension, which are key features to have an efficient performance in DC-DC converters. Results also confirm the Small-Signal Model of the circuit, as a correct objective function for the parameter optimization, achieving more than 90% of accuracy on the presented behavior.
Highlights
During the last few decades, power electronic devices are more often used at residential houses, industries, including electric vehicles, portable battery-operated electronic equipment, photovoltaic systems, energy storage systems, variable-speed air conditioners, etc., [1]
The PID gains optimization showed the basic conceptualization of the Integral of Time Multiplied by Absolute Error (ITAE) performance index as cost function, which inspired the criteria utilization for this proposed methodology in DC-DC converters design, as explored in [2]
If the inductor value is increased, it grows with its Equivalent Series Resistance (ESR, R L in this work) which increases the losses in the inductor and the efficiency of the converter will be compromised
Summary
During the last few decades, power electronic devices are more often used at residential houses, industries, including electric vehicles, portable battery-operated electronic equipment, photovoltaic systems, energy storage systems, variable-speed air conditioners, etc., [1]. Increasing demand for power electronic devices leads to new challenges to be solved or to solutions to be improved; such as power losses, power efficiency, voltage, current regulation, and high operating frequency. These power electronic devices with high-efficiency requirements and low noise dependence use DC-DC converters in order to satisfy the requirements. To fulfill these demands, DC-DC converters must operate at high efficiency over a wide load range. It is necessary to select the correct inductance and capacitance values, as explained in [2,3]
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