激光冲击强化电源拓扑及控制

Laser shock processing power supply topology and control

采用IGBT全桥逆变电路作为钕玻璃激光器本征级和放大级泵浦氙灯驱动电源主电路拓扑,结合内环为电流控制,外环为电压控制的双闭环控制电路实现了氙灯驱动电源储能电容的恒流限压充电.高压脉冲触发电路由气体放电管与高压脉冲变压器构成,可产生电压峰值高达30 kV的高压脉冲信号,能可靠击穿泵浦氙灯.设计了脉冲氙灯放电触发脉冲工作时序电路,当系统工作在调Q模式时,可以获得峰值功率很高的巨脉冲激光输出.对TC4钛合金TIG焊接头进行了激光冲击强化处理,效果显著.

IGBT full-bridge inverter circuit was used as the main circuit topology of the intrinsic and amplifier stage xenon lamp drive power supplies in the Nd glass laser.Double-loop negative feedback control circuits,which include current control in inner loop and voltage control in outer loop,were used in xenon lamp drive power supplies to achieve the constant current charging to the energy storage capacitor at the limited voltage.High-voltage pulse trigger circuit can produce peak voltage of 30 kV and make xenon lamp cut down reliably,which is composed of the gas-discharge tubes and high-voltage pulse transformer.Pulsed xenon lamp discharge trigger circuit is proposed to gain a very high peak power in pulse laser output by adjusting Q mode.This laser shock processing power supply was applied to TC4 titanium alloy tungsten inert gas(TIG) welding joints,and the effect is significant.