C O2激光器高压高频充电电源的应用研究

摘要

In order to improve the disadvantage of the fundamental frequency charging power supply which has large volume,large weight and low charging precision,a high frequency and high voltage charging power supply including a full bridge inverter circuit and a series resonant soft switch circuit was developed,and its output voltage is 36 kV and average charging power is 10 kJ/s.Employing three phase 380 VAC as its energy system,high power intelligent power module(IPM)as full bridge inverter circuit,high voltage pulse charging for load capacitor is generated by series reso-nant circuit and high voltage pulse transformer.The system is controlled by sampling output voltage and output cur-rent,chip SG3525 controls duty cycle of driving signal by feedback signal.Experimental results show that output volt-age of the charging power supply is 36 kV,output average charging power is 10.8 kJ/s,charging efficiency is 0.82 and ripple coefficient is 1%.The laser works stably in 30 Hz by applying the series resonant charging power supply system.%为改善现有CO2激光器工频充电电源体积、重量大、充电精度低等缺点，开展高频高压充电电源的研究，研制一台采用全桥逆变结构和串联谐振软开关电路、输出电压36 kV、输出平均充电功率为10 kJ／s的高频高压充电电源。该电源系统采用三相380 VAC作为供电系统，大功率智能功率模块（IPM）作为全桥逆变电路，逆变交流信号经串联谐振电路及高频脉冲变压器得到高压脉冲信号，高压脉冲经整流给负载电容充电；同时，电源应用电压、电流双闭环控制系统，输出电压、电流经采样及放大反馈到电源控制芯片SG3525，SG3525通过判断反馈信号的大小控制输出PWM驱动信号的占空比。实验结果表明：电源输出电压36 kV，输出平均功率为10.8 kJ／s，充电效率为0.82，电源纹波系数为1％。电源系统保证了激光器稳定工作在30 Hz条件下。