摘要
研制了一种基于直流调制技术应用于光子调制的Pockels Cell前馈驱动源,针对线路中分布参数对行波传播的散射作用,建立了驱动脉冲信号在电路中传输的等值电路模型,分析了分布参数散射作用对功率开关器件触发导通延时的影响.分析得出因电路分布参数对开关驱动信号的散射,造成驱动脉冲信号前沿变缓,进而导致功率开关器件触发导通延时以及功率脉冲波前沿上升时间增加,从而在一定程度上增加了脉冲传输的时延的结论.通过改进驱动电路、优化电路布线、添加LC网络匹配电路等措施,改善了驱动脉冲传输时延的问题.实验结果表明,经综合改进后电路的驱动脉冲传输时延下降至100ns,相比未改进前300ns左右时延改进效果显著.
A Pockels Cell feedforward driving source based on DC modulation was proposed,which was applied to photon modulation.Aiming at the scattering effect of distribution parameters on wave propagation in circuit,an equivalent model circuit was built to simulate the pulse wave transmission in circuit and the influence of the scattering effect of distributed parameters on the triggered flow of the power switching device was analyzed.It was found that the scattering effect of distributed parameters on the switching drive signal resulted in a slower front edge of the drive pulse,which prolonged the triggered flow delay of the power switching device and increased the rising edge of the power pulse,thus increasing the delay time of pulse transmission.Some methods,including driving circuit improvement,circuit wiring optimization,and augment of an LC network matching circuit,were adopted to improve drive pulse transmission time delay.Experiment results indicate the pulse transmission delay of the improved circuit dropped remarkably from 300 ns to 100 ns in comparison with the original circuit.
