摘要
在研制一台输出功率20 k W,开关频率50 k Hz的全数字控制脉冲MIG/MAG逆变弧焊电源DPS-500时,为了提高系统的控制精度和动态响应,采用了峰值电流模式PSFB-ZVS PWM主电路拓扑.运用平均开关建模法,建立PSFB-ZVS PWM变换器的功率级在CCM下的小信号模型.推导峰值电流模式控制部分的小信号模型,最终建立峰值电流模式PSFB-ZVS PWM逆变弧焊电源的完整小信号模型.推出斜率补偿的设计原则,设计了PI频率补偿器.小信号模型的解析计算结果与通过Simplis小信号频域分析工具软件获得的频域响应一致.
For the development of a digitalized 20 kW /50 kH z pulsed MIG / MAG arc-welding inverter,the Peak current mode PSFB-ZVS PWM converter topology is used to improve the accuracy and dynamic response of the control system. ThesmallSignal model for power stage of PSFB-ZVS PWM in CCM is derived using the averaged switch modeling approach. A complete small-signal model of the peak current mode PSFB-ZVS PWM arc-welding inverter is derived based on the derivation of the small-signal model for peak current mode control stage. The design principle of slope compensation is derived. A PI frequency compensator is designed. The analytical result of small-signal model is accord with the frequency response through the frequency domain simulation using Simplis software.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第1期81-84,132-133,共4页
Transactions of The China Welding Institution
基金
四川省2015年第一批省级科技计划资助项目(2015FX0021)
关键词
逆变
弧焊电源
峰值电流模式
平均开关建模
小信号模型
inverter
arc-welding power supply
peak current mode
averaged switch modeling
small-signal model
