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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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

Received: 22 January 2024

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TM46

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	Wang Yifeng
	Che Chaochang
	Chen Bo
	Bai Yu
	Zhang Xiangqian

Cite this article:

Wang Yifeng,Che Chaochang,Chen Bo等. Research and Design of High Voltage Wide Range DC Auxiliary Power Supply Based on SiC Devices[J]. Transactions of China Electrotechnical Society, 0, (): 2492907-2492907.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240158 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/2492907

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