一个高效率的初级侧调节控制策略,用于半桥LLC共振转换器,具有广泛的输入电压范围
Mian Dai1, Daying Sun2, Xinyu Wei1
1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China.
Scientific reports
|October 19, 2023
概括
一个新的自适应脉冲宽度和频率调制 (APWFM) 策略提高了光伏转换器的效率. 这种方法通过优化开关频率和工作周期,减少组件尺寸来提高轻型和中型负载性能.
科学领域:
- 电气工程 电气工程
- 电力电子 电力电子 电力电子
- 可再生能源系统可再生能源系统
背景情况:
- 半桥LLC共振转换器对于需要广泛输入电压范围的光伏 (PV) 系统至关重要.
- 在这些转换器中,传统的频率调制 (FM) 由于广泛的开关频率范围,在轻载荷下受到效率降低和更大的组件尺寸的影响.
- 在光伏应用中,对高效和紧的功率转换的需求正在增加.
研究的目的:
- 为光伏应用中半桥LLC共振转换器提出一个高效的控制策略.
- 为了解决在轻量级和中等负载下常规频率调制 (FM) 的局限性.
- 为了提高整体转换器效率并减少组件体积.
主要方法:
- 引入一个自适应脉冲宽度和频率调制 (APWFM) 控制策略.
- 同时调整开关频率和工作周期以调节转换器增益.
- 实施主侧调节 (PSR) 以消除对光电偶的需求,并简化控制电路.
主要成果:
- 与FM相比,APWFM实现了较小的切换频率变化范围.
- 在中等和轻载荷下观察到显著的效率改善.
- 在实验验证中,平均效率提高了5%.
- 拟议的战略允许更小的磁性组件体积.
结论:
- 与传统的FM相比,APWFM控制策略为光伏应用中的半桥LLC共振转换器提供了优越的解决方案.
- 这种方法提高了效率,特别是在轻量级和中等负载条件下,同时保持了紧的设计.
- 集成PSR进一步简化了控制电路,使解决方案具有成本效益和实用性.
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