Algamluoli Ammar Falah, Wu Xiaohua, Mahmood Mustafa F
School of Automation, Northwestern Polytechnical University, Xi'an, 710072, China.
Electrical Engineering Technical College, Middle Technical University, Baghdad, Iraq.
Sci Rep. 2023 Sep 30;13(1):16436. doi: 10.1038/s41598-023-42638-5.
This paper introduces an optimized DC-DC converter that employs a modified switched inductor-capacitor technique to achieve ultra-high voltage gain for renewable energy systems. The development is based on adding one cell of modified switched inductor (MSL1) with series diodes interleaved with the main switch in the proposed DC-DC converter. The (MSL1) with capacitor operates in resonant mode to reduce current stress across the main switch when the charge in capacitor becomes zero. This approach also reduces voltage stress across the main switch, all inductors, and diodes. Furthermore, modified switched inductors (MSL2) with an auxiliary switch and a coupled capacitor are incorporated to provide double boosting voltage and to achieve high voltage gain. Additionally, a main and auxiliary switch are integrated with modified switched capacitors (MSC) to provide ultra-high voltage gain and to reduce voltage stress across auxiliary switch. Moreover, the proposed converter exhibits a continuous input current with zero pulsating, even at very low duty cycles. The advantages of the proposed converter are high efficiency, low voltage stress, and low values of inductors and capacitors when utilizing a high switching frequency. A mathematical model for the proposed converter is developed for both continuous conduction mode and discontinuous conduction mode. In addition, the PCB design for the proposed converter is presented, and experimental tests are conducted to verify the simulation and laboratory results. The proposed converter aims to boost the voltage from 20 to 40 V to a variable output voltage between 200 and 400 V, delivering 400 watts of power with an efficiency of 96.2%.
本文介绍了一种优化的DC-DC转换器，该转换器采用改进的开关电感-电容技术，为可再生能源系统实现超高电压增益。该转换器的开发基于在所提出的DC-DC转换器中添加一个改进开关电感（MSL1）单元，其串联二极管与主开关交错排列。带有电容的（MSL1）以谐振模式工作，当电容中的电荷变为零时，可降低主开关上的电流应力。这种方法还降低了主开关、所有电感和二极管上的电压应力。此外，还引入了带有辅助开关和耦合电容的改进开关电感（MSL2），以提供双倍升压电压并实现高电压增益。此外，主开关和辅助开关与改进开关电容（MSC）集成在一起，以提供超高电压增益并降低辅助开关上的电压应力。此外，即使在非常低的占空比下，所提出的转换器也能呈现连续的输入电流且无脉动。所提出的转换器的优点是在使用高开关频率时效率高、电压应力低，以及电感和电容值低。针对所提出的转换器，开发了连续导通模式和不连续导通模式下的数学模型。此外，还给出了所提出的转换器的印刷电路板设计，并进行了实验测试以验证仿真和实验室结果。所提出的转换器旨在将20至40V的电压升压至200至4ooV之间的可变输出电压，输出功率为400瓦，效率为96.2%。
