峰值电流模式PSFB-ZVS PWM逆变弧焊电源的完整小信号模型及控制环路设计
Small-signal modeling for peak current mode PSFB-ZVS PWM arc-welding inverter and control loop design
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摘要: 在研制一台输出功率20 kW,开关频率50 kHz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.Abstract: For the development of a digitalized 20 kW/50 kHz 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. Thesmall-Signal 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.
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Key words:
- inverter /
- arc-welding power supply /
- peak current mode /
- averaged switch modeling /
- small-signal model
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