谐振变换器的数字控制:通过抖动提高频率分辨率

M. Peretz, S. Ben-Yaakov
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引用次数: 17

摘要

谐振变换器和相关系统,如压电变压器,可能需要一个高分辨率的频率驱动,当网络的质量因子很高或避免极限环振荡。这种高频分辨率的要求可能超出了低成本微控制器的能力。为了解决这一问题,提出了一种频率分辨率增强算法,并进行了仿真测试和实验验证。该方法基于对分数n抖动概念的改进,包括自适应抖动周期和平滑的DPWM频率转换。该方法在数字硬件上的实现很简单,只需要CPU提供适度的额外工作负载。对所提出的抖动方法在驱动谐振网络时的建模进行了理论分析,以确定产生抖动的原因,并量化信号在驱动谐振网络时的预期输出失真。该方法在串联谐振并联变换器和压电变压器两种类型的谐振变换器上进行了实验验证。结果表明,输出信号失真小于输出驱动器峰值幅度的1%,在许多应用中是可以接受的。实验结果与理论预测非常吻合,验证了抖动方法作为谐振网络驱动频率分辨率增强器的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Digital Control of Resonant Converters: Enhancing Frequency Resolution by Dithering
Resonant converters and related systems, such as piezoelectric transformers, may require a high-resolution frequency drive when the quality factor of the network is high or to avoid limit cycle oscillations. This high frequency resolution requirement could be beyond the capabilities of low cost microcontrollers. To remedy this problem, a frequency resolution enhancement algorithm was developed, tested by simulations and verified experimentally. The proposed approach is based on a modification of the fractional-N dithering concept and includes an adaptive dithering period and smooth DPWM frequency transitions. The implementation of the approach on the digital hardware is simple and requires modest additional workload from the CPU. Theoretical analysis was carried out to model the proposed dithering method when applied to drive resonant network in order to identify the causes and to quantify the expected output signal distortion when the signal is used to drive resonant networks. The proposed approach was tested experimentally on two types of resonant converters: a series-resonant parallel-loaded converter and a piezoelectric transformer. It was found that the output signal distortion is less than 1% of the peak amplitude of the output drive which would be acceptable in many applications. The experimental results were found to be in excellent agreement with the theoretical predictions, validating the usefulness of the dithering method as a frequency resolution enhancer for resonant network drive.
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