用于前端整流器的高效高密度可调直流变压器

doi:10.19595/j.cnki.1000-6753.tces.210240

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摘要前端整流器中,基于级联H桥（CHB）的功率因数校正器能够充分利用低压器件损耗低的特点以获得高效率,并大幅降低电感体积以提高功率密度。但是,由于CHB拓扑导致多个独立的低压母线,后级多个独立的DC-DC必需针对上述特征进行优化设计。该文采用可调直流变压器（RDCX）电路作为后级DC-DC,在保证输出电压紧调整的同时,利用RDCX电路的部分功率调节特性,取得了高效高功率密度。针对多个RDCX模块的组合优化问题,建立模块输出电压与二次侧整流管最小损耗的模型,找出了二次侧整流管损耗最小的RDCX模块组合结构。同时,提出一种兼顾功率密度和损耗最小的变压器优化设计方法。基于上述方法,设计单模块500W,总功率3kW的6模块RDCX组合样机。该样机峰值效率达到了98.1%,满载效率达到了97.9%,功率密度达到了1 300W/in³（1in³=1.638 71×10^-5m³）。

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关键词 ：前端整流器, 高效率, 高功率密度, 可调直流变压器（RDCX）

Abstract：In the front-end rectifier, the power factor corrector (PFC) based on the cascaded H bridge (CHB) can make full use of the low loss characteristics of low-voltage devices to obtain high efficiency, and greatly reduce the inductor volume to increase power density. However, the CHB topology leads to multiple independent low-voltage buses. Thus, multiple independent DC-DCs should be optimized and utilized in the second stage. In this paper, a regulated DC transformer (RDCX) was used in the DC-DC stage to get tight regulation capability, high efficiency and high power density, by utilizing its characteristic of partial-power regulation. A model of minimum loss of secondary-side switches and output voltage was established, and the best connection structure of second-stage RDCX modules was found. At the same time, a transformer optimization method taking the power density and minimum loss into account was proposed. Finally, a 6-cell RDCX prototype with a single module power of 500W and a total power of 3kW was built. The prototype has a peak efficiency of 98.1%, a full load efficiency of 97.9%, and a power density of 1 300W/in³.

Key words： Front-end rectifier high efficiency high power density regulated DC transformer (RDCX)

收稿日期: 2021-03-01

PACS:

TM46

基金资助:国家自然科学基金（51877191）和浙江省杰出青年基金（LR18070001）资助项目

通讯作者: 吴新科男,1978年生,教授,博士生导师,研究方向为高效率高功率密度的AC-DC和DC-DC变换技术。E-mail:wuxinke@zju.edu.cn

作者简介: 刘天骥男,1990年生,博士研究生,研究方向为高效高密度直流变换器。E-mail: tianji_liu@zju.edu.cn

引用本文:

刘天骥, 吴新科, 杨树. 用于前端整流器的高效高密度可调直流变压器[J]. 电工技术学报, 2021, 36(20): 4256-4264. Liu Tianji, Wu Xinke, Yang Shu. High-Efficiency High-Density Regulated DC Transformer for the Front-End Rectifier. Transactions of China Electrotechnical Society, 2021, 36(20): 4256-4264.

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