斯特林制冷机逆变电源设计

Design of inverter power for Stirling cryocooler

设计了一种基于STM32F103单片机的斯特林制冷机的单相正弦逆变电源。给出了升压电路和逆变桥电路的硬件设计方法,以及正弦脉宽调制波实现的软件算法。为了使输出端输出稳定的正弦波,研究了几种滤波方法,最后选用了LC低通滤波电路,通过时频特性分析计算出L、C值,能有效地抑制高频谐波,减小无功功率。实验结果表明,所设计的电源输入端可以实现0~20 V的直流输入,输出端最高电压输出可达36 V,可满足小型斯特林制冷机的工作要求。

A single-phase sinusoidal inverter power supplying for Stirling cryocooler based on STM32 F103 microcontroller is designed. The hardware design of step-up circuit and inverter bridge circuit are introduced, and the software algorithm of SPWM wave implementation are given. In order to output stable sine wave, several filtering methods are studied, finally the LC Low-pass filter circuit is selected, and the L and C values are calculated by analyzing time-frequency characteristics, which can effectively restrain high-frequency harmonics and reduce reactive power. The experimental results show that the designed power input can achieve 0 to 20 V dc input, meanwhile, the maximum voltage output can reach 36 V, which can meet the working requirements of small Stirling cryocooler.