线性斯特林制冷机逆变器的频率精度分析

陈蕊; 孔德锐; 唐天敏; 夏明

线性斯特林制冷机逆变器的频率精度分析

昆明物理研究所, 云南昆明 650223

详细信息

作者简介:
陈蕊（1996-），女，云南大理人，硕士研究生，研究方向：小型低温制冷机。E-mail：571313836@qq.com

通讯作者:
夏明（1977-），男，博士，研究员，主要从事小型低温制冷机研究。E-mail：15969586435@163.com

中图分类号: TN214
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出版历程
- 收稿日期: 2022-04-26
- 修回日期: 2022-06-22
- 刊出日期: 2023-01-19

Frequency Accuracy Analysis of Linear Stirling Refrigerator Inverter

Kunming Institute of Physics, Kunming 650223, China

摘要

摘要: 线性斯特林制冷机在整个工作过程中，输入正弦交流电的频率精度是直接影响线性斯特林制冷机振动的重要因素。尤其是对于单活塞线性斯特林制冷机而言，输入的正弦交流电频率精度将直接影响到与之相连的动力吸振器的减振性能。基于此，本文在线性斯特林制冷机逆变器的研究基础上，通过对SPWM（Sinusoidal Pulse Width Modulation）波生成方法、逆变电路中MCU（MoneyWise Credit Union）时钟频率及滤波电路中截止频率、电容和电感等多个参数的分析，得到了开关数和频率精度之间的关系。根据实际应用的要求，线性斯特林制冷机逆变器输出实际频率与目标频率误差不得超过±0.1Hz，频率精度则需要求控制在±0.1%以内。所以在该应用条件下，本文在单片机MCU频率为72 MHz时找到了满足合适需求的开关次数在1400~2400之间，其对应的频率精度均小于±0.1%。
- 线性斯特林制冷机 /
- 开关数 /
- 截止频率 /
- 频率精度
Abstract: During the entire work process, the frequency accuracy of input sine AC power directly affects the vibration of the linear Sterling refrigerator. Especially for single -piston linear Sterling refrigerators, the input sine AC electro -frequency accuracy will directly affect the vibration, reducing performance of the dynamic vibrator connected. Based on the research on the linear Stirling refrigerator inverter, through the analysis of the SPWM wave generation method, the MCU clock frequency in the inverter circuit, the cut-off frequency in the filter circuit, capacitance and inductance, etc., the relationship between the number of switches and frequency accuracy is obtained. According to the requirements of the actual application, the error between the actual output frequency of the linear Stirling refrigerator inverter and the target frequency must be less than ± 0.1Hz, and the frequency accuracy needs to be controlled within ± 0.1 %. Therefore, under this application conditions, when the MCU frequency is 72 MHz, the number of switches that meets the requirements is found to be between 1400-2400, and corresponding frequency accuracy is less than < ± 0.1%.
- linear Stirling refrigerator /
- number of switches /
- cut off frequency /
- frequency accuracy

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图 1 单相逆变器原理

Figure 1. Schematic diagram of a single-phase inverter

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图 2 SPWM波生成原理

Figure 2. SPWM wave generation schematic

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图 3 LC低通滤波器原理图

Figure 3. Schematic of an LC low-pass filter

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图 4 低通滤波器截止频率原理

Figure 4. Schematic of the cutoff frequency of a low-pass filter

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图 5 时钟信号对应方波原理

Figure 5. Clock signal corresponding to square wave schematic

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图 6 实验搭建平台

Figure 6. Experimental platform construction

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图 7 70 Hz、2300次时实际频率精度图

Figure 7. Actual frequency accuracy at 70 Hz, 2300 times

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图 8 在70 Hz目标频率下，实际、理论频率误差对比柱状图

Figure 8. At a target frequency of 70 Hz, the actual and theoretical frequency errors are compared histograms

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图 9 实际频率精度以及计算的理论频率精度对比图

Figure 9. Comparison of actual frequency accuracy and calculated theoretical frequency accuracy

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