A Partial Power Regulated Dc Transformer Optimized by Genetic Algorithm for High Step-Up Power Conversion | IEEE Journals & Magazine | IEEE Xplore

A Partial Power Regulated Dc Transformer Optimized by Genetic Algorithm for High Step-Up Power Conversion


Abstract:

An isolated partial power regulated dc transformer (DCX) for step-up applications is proposed in this article. The proposed converter consists of two DCXs operating at th...Show More

Abstract:

An isolated partial power regulated dc transformer (DCX) for step-up applications is proposed in this article. The proposed converter consists of two DCXs operating at the unregulated state and a nonisolated dc–dc converter for the system output voltage regulation. The primary sides of the two DCXs are integrated by sharing a common bridge arm, and the merging of the secondary side components can be realized by the series connection of the secondary windings, which is beneficial to reduce the number and cost of components. The partial power processing is realized with different input voltages of the two bridge arms of DCX1, and the power handled by the voltage regulator can be reduced furtherly by the two transformers. In order to minimize the total power loss furtherly, the genetic algorithm (GA) is adopted to realize parameter optimization. Compared with the traditional two-stage structure, the voltage regulator only processes a small part of the power, resulting in lower devices stress and power losses. The steady-state working principle, voltage regulation scheme, power share criterion, and parameters optimal design are introduced in detail. An experimental prototype with 24–30-V input and 200-V/1-A output is built under 1-MHz switching frequency. The achieved peak efficiency is 95.45%.
Published in: IEEE Transactions on Transportation Electrification ( Volume: 10, Issue: 3, September 2024)
Page(s): 7431 - 7442
Date of Publication: 28 November 2023

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I. Introduction

Nowadays, the rapid electrification development of automobile propulsion systems has improved the environmental issues significantly, while also reducing the reliance on traditional fossil fuels for transportation. In the front stage of the propulsion system, a dc–dc converter is usually adopted to realize the conversion of the variable low voltage of battery to a constant high-level voltage, which serves as the input of inverter to drive the motor. Therefore, the voltage regulation ability is necessary for the dc–dc converter to adapt to the change of input and achieve the efficient and high-gain voltage conversion [1], [2], [3].

References

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