脉冲激光器大电流窄脉冲驱动设计

介绍了利用金属氧化物场效应管产生大电流窄脉冲来驱动激光二极管的原理,推导出驱动金属氧化物场效应管峰值驱动电流的计算公式和开通时间的估算公式,通过仿真总结出影响驱动电源脉冲电流的脉宽、幅度和振荡的主要因素,理论和仿真结果表明,器件的寄生电感、电路走线电感和负载寄生电感对电流影响较大。实验结果显示,在供电高压为200 V时,金属氧化物场效应管开通时间为2 ns;激光二极管驱动电流上升时间小于10 ns,脉宽为15~100 ns,幅度为0~50 A连续可调,频率为0~50 kHz。

Design of high current narrow width pulsed power supply of laser diode

The principle of high power MOSFET generating high-current narrow-width pulses to drive laser diode is theoretically analyzed, and the formula of MOSFET gate drive current and the estimation formula of MOSFET drive rise time are obtained. The key factors which influence the laser diode(LD) power supply current width, amplitude and oscillation are summarized through simulation. Theory and simulation show that components stray inductance, circuit routing inductance and load inductance influence the drive current greatly. Experiment results show that the MOSFET switch-on time is about 2 ns at the drain-source voltage of 200 V. The LD drive power supply’s pulse current possesses a rise-time less than 10 ns, with the pulse width, amplitude and frequency ranging in 15～100 ns， 0～50 A and 0～5