基于移相控制的软开关臭氧电源

研究了一种基于直流母线开关和谐振电容实现所有开关器件软开关的新型高效臭氧发生电源,分析了电路半周期的6个工作模态,得到了软开关实现的时序控制条件.采用IGBT模块作为电源开关,使用TMS320F28335作为控制器,设计了一台160g/h规格的臭氧发生器样机.该样机中,通过PSPWM移相调功实现臭氧产量调节,采用臭氧发生管端电压的PI闭环控制和软件锁相负载频率自动跟踪技术保障负载工作在准谐振状态.电源长期运行稳定可靠,运行测试波形与理论分析及仿真相当吻合,具有较大的实用价值.

A Soft-switching Power Supply for Ozone Generation Based on Phase-shifted Control

A new soft-switching power supply for ozone generator was studied,in which soft-switchings for all IGBTs could be achieved with the assistance of two DC-busline switches and a resonant capacitor.The timing control conditions for all IGBTs to achieve soft-switching were developed on the basis of the analysis of working modes during half cycle of the circuit.Using IPM module as the power switches and TMS320F28335 as the controller,an ozone generator switch with an ozone production of 160 g/h was designed.In the generator,a phase-shift PWM controller was used to adjust the discharge power,a PI algorithm of the ozone tube voltage and a DPLL switch finish frequency automatic tracking of load curren were used to guarantee the power supply working in series resonant.Simulation and experimental results were provided to verify the effectiveness of the proposed system.