基于SiC器件的高压宽范围直流辅助电源研究与设计

doi:10.19595/j.cnki.1000-6753.tces.240158

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摘要

辅助电源是电力变换装置中的重要组成部分,在太阳能发电站等系统中,需应对高压宽范围输入下的稳定运行挑战。针对单管反激电源在高压宽范围输入下导致的高电压应力、高成本以及低效率问题,该文基于级联反激变换器,首先进行了开关模态分析,深入研究计及寄生参数的开关工作过程;然后在此基础上,建立级联反激变换器的精确数学模型,研究了各核心元器件对电路性能的影响,并提出一种参数设计方法;最后基于SiC器件,搭建了一台300~1 500V输入,24 V输出的100 W辅助电源样机,变换器全工况运行中最高效率达到93.4%。结果验证了所设计的高压宽范围辅助电源方案的可行性和正确性。在低成本、宽输入范围和高电压应力条件下,保证了辅助电源的高效转换。

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关键词 ： SiC, 高压, 辅助电源, 反激变换器

Abstract：

Auxiliary power supplies are vital components of power conversion devices and must address the challenges of stable operation under high-voltage and wide-range input conditions in systems such as solar power stations. This research focuses on the issues of high voltage stress, high cost, and low efficiency in traditional flyback converters under high-voltage and wide-range input conditions, conducting research based on the cascaded flyback converter. The main work of the research includes:
(1)Based on the two-stage cascaded flyback converter, its operating modes are analyzed, and the switching process considering parasitic parameters is delved into. Detailed analyses and modeling are conducted for the dynamic and static voltage distributions during the turn-off process. The dynamic voltage distribution process of MOSFETs in the cascaded flyback converter exhibits a positive feedback characteristic. The inherent delay of the drive signal leads to a voltage difference between the two switches, which is further amplified by the negative correlation between C_ossand V_ds, causing the voltage difference between the two switches to increase. When the sum of the two voltages reaches V_in+V_R, the voltage difference stabilizes. During the static voltage distribution process, the switch voltage changes exponentially after dynamic voltage distribution. This process increases the loss in resistor R₁ and elevates the voltage stress on the upper switch S₂. Therefore, reasonable design of R₁ is essential to reduce losses during parameter design. Additionally, the impact of drive capacitance and parasitic capacitance on the quasi-resonant turn-on process is analyzed, and the expression for the drive voltage of the upper switch is provided. Based on the comprehensive analysis, a novel parameter design method for the two-stage cascaded flyback converter is proposed to optimize the overall performance of the converter.
(2)Peak current mode control is employed to enhance the system's response speed to wide voltage range inputs. Small-signal modeling is completed for the cascaded flyback converter under peak current control mode, and a type-II compensation is adopted to adjust the crossover frequency, improving the dynamic performance of the auxiliary power supply.
(3)Utilizing SiC devices, a 100 W auxiliary power supply prototype with an input range of 300—1 500 V and an output of 24 V is constructed. The converter achieves a maximum efficiency of 93.4% during full operating conditions. The results validate the feasibility and correctness of the designed high-voltage, wide-range auxiliary power supply scheme. Efficient conversion of the auxiliary power supply is ensured under conditions of low cost, wide input range, and high voltage stress.

Key words： SiC high voltage auxiliary power supply flyback converter

收稿日期: 2024-01-22

PACS:

TM46

基金资助:

国家自然科学基金青年基金项目--建筑/户用兆赫兹千瓦级储能双向直流变换技术及其控制方法研究（52307216）

通讯作者: 陈博男,1989年生,博士研究生,研究方向为谐振软开关变换器。E-mail：cb92614@126.com

作者简介: 王议锋男,1981年生,副教授,博士生导师,研究方向为高频电能变换技术、磁集成技术、软开关技术及交直流微电网中的电力电子技术等。E-mail：wayif@tju.edu.cn

引用本文:

王议锋, 车超昌, 陈博, 白昱, 张向前. 基于SiC器件的高压宽范围直流辅助电源研究与设计[J]. 电工技术学报, 0, (): 2492907-2492907. Wang Yifeng, Che Chaochang, Chen Bo, Bai Yu, Zhang Xiangqian. Research and Design of High Voltage Wide Range DC Auxiliary Power Supply Based on SiC Devices. Transactions of China Electrotechnical Society, 0, (): 2492907-2492907.

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