一种脉冲激光器驱动电路的实现方法

A Realization Method of Driving Circuit For Pulse Laser

激光器驱动电路是激光雷达的重要组成部分,其技术指标将直接影响到激光雷达整体性能。根据激光器的特点,激光光脉冲有两个主要参数:脉冲能量和宽度。这两个因素对距离和距离分辨率分别有很大的影响。常见的驱动电路大都利用DC-DC升压电路,大电感充放电来实现,能量不稳定,并且电路纹波较大。在过去的十年中,具有成本效益的Si MOSFET器件商业化程度很高,但是其寄生电感以及开关品质因数会明显影响激光驱动电路,当脉冲宽度窄到一定程度时,激光脉冲峰值功率也会急剧下降。为解决以上问题,设计了一款窄脉宽、体积小、功耗低、噪声小、能量稳定性强的驱动电路,并指出了驱动电路设计时应当注意的问题。激光器的输出可以通过CPU产生的信号直接控制,实现高重频,输出上升沿约为2.5ns、脉冲宽度为6ns的脉冲,电路板尺寸为3.2cm×2.8cm,单板功耗约为0.65W,这些特性可以用于激光雷达工程化当中。

Laser driving circuit is an important part of lidar,and its technical specifications will directly affect the overall performance of lidar.According to the characteristics of laser,the laser pulse has two main parameters:pulse width and energy.These two factors have a large effect on the distance resolution and the range respectively.Most of the common driving circuits use DC-DC boost circuit,large inductor charge and discharge to achieve,the energy is unstable,and the circuit ripple is large.In the past decade,cost-effective Si MOSFET devices have been highly commercialized.However,the parasitic inductance and switching quality factor will significantly affect the laser driving circuit.When the pulse width is narrow to a certain extent,the peak power of laser pulse will drop sharply.In order to solve the above problems,this paper designs a laser drive circuit,which realizes a drive circuit with narrow pulse width,small size,low power consumption,low noise,and strong high voltage stability,and points out what should be paid attention to when designing the drive circuit.The output of the laser can be directly controlled by the CPU,to achieve high repetition frequency,The output rising edge is about 2ns and a pulse width of 10ns,The size of the circuit board is about 3.2cm×2.8cm,and the power consumption of the single board is about 0.5w,these characteristics can be used in the engineering of lidar.