Abstract
To optimize the selection of the bulk capacitor in a flyback converter, this paper proposes a method based on the lifetime and volume of aluminum electrolytic capacitors (Al e-caps). Firstly, mathematical models for the low-frequency and high-frequency harmonic currents of the bulk capacitor are established. The accuracy of these models has been verified by comparing the Saber simulation results and experimental results with calculated results, providing a basis for accurately calculating capacitor losses. Secondly, a lifetime model for the capacitor is established based on capacitor losses. The Pareto frontier of capacitor loss lifetime and volume is obtained using the multi-objective particle swarm optimization (MOPSO) algorithm, providing a basis for the optimal selection of the bulk capacitor. Finally, a 75 W flyback converter prototype is built based on the results obtained from the optimization process according to personalized requirements. The results show that the optimized capacitor has almost no effect on efficiency, and the volume decreases by 36.8 % with a sacrifice of 4.21 % in loss lifetime.
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