AC PMIG电源动态性能

Dynamic capability of AC PMIG power

ACPMIG弧焊电源由一次全桥逆变电路、二次推挽逆变电路以及电流控制系统、电压控制系统构成.焊丝熔化及熔滴过渡由脉冲电流控制实现,要求电流控制系统具有很高的动态响应速度以及抗干扰性能.利用计算机辅助分析及设计的电流控制系统,其输出100A的阶跃响应的最大超调量2 2554%,峰值时间0 0013s,上升时间5 8602×10-4s,2%误差带的调节时间0 0014s,稳态误差0.应送丝速度及电弧电压控制的需要,设计的电压控制系统,其输出电压10V阶跃响应的最大超调量5 9358%,峰值时间0 0164s,上升时间0 0045s,2%误差带的调节时间0 0543s,稳态误差0.弧焊电源输出电流电压的动态性能满足焊接工艺控制的要求.

AC PMIG arc welding power source is composed of primary full-bridge inverter circuit, secondary push-pull inverter circuit, current control system and voltage control system. Welding wires melt and metal transfer are achieved by controlling pulse current ,which need high dynamic response speed and anti-jamming capability of current control system. Computer aided analysis and design The current control system. The of the maximum exceeded modulation step response is (2.2554%), crest time is (0.0013) s, rise time is (5.8602)×10 s, and adjustment time is (0.0543) s with 2% error. Steady error is 0 as outputting 100 A. According to the need of wire-speed and arc voltage control, the voltage control system, with of 5.9358%, the maximum of exceeded modulation 0.0164 s of crest time and 0.0543 s rise time of 0.004 ss rise time adjustment time is , when error is 2%. Steady error is 0 when it outputting 10 V.The dynamic capability of output current and voltage of the arc welding power source can satisfy the requirement of welding technology.