OPO人眼安全激光测距机的脉冲驱动电源设计

针对OPO人眼安全激光测距机对驱动电源的实际使用需求,兼顾高可靠性、小型化设计原则,设计了一款具有多重保护功能的脉冲驱动电源。采用了储能网络配合开关电路的总体技术方案。详细电路设计中,输入保护电路采用集成电路LT4363和MOS管相结合的方式;充电电路采用以集成电路UC2846为控制芯片的BOOST变换器结构;储能网络选用具有超低等效串联电阻的非固体电解质高能混合钽电容器;放电开关管选用两个大功率N沟道MOS管IRFP4668相并联实现;放电保护电路采用电压滞回比较器和逻辑电路相结合的方式。试验结果表明,驱动电源能够输出峰值为220 A,脉宽为230μs,重复频率20 Hz的脉冲电流,且保护功能全、体积小、重量轻,能够配合OPO人眼安全激光测距机实现19.5 km目标测距,满足系统使用需求,具有重要的应用价值。     

Hundred hertz and hundred millijoules all-solid-state nanosecond laser technology北大核心CSCD

According to the requirements of multi-target and pseudo-random coded laser semi-active terminal guidance, as well as the fast target ranging and other application environments, a hundred hertz and hundred millijoules all-solid-state nanosecond laser was designed to meet the requirements of integrated, miniaturized and practical prototype. Based on the modular time-sharing pump mode, the heat dissipation pressure of the unit volume laser working material and its pump source was effectively reduced. At the same time, the unstable laser resonator technology was adopted to improve the quality of the outgoing laser beam. Finally, the two resonant lasers were combined into one beam through polarization control to realize the output of a high beam quality hundred hertz and hundred millijoules nanosecond pulse laser. The weight of the integrated prototype is only 15.5 kg. At the operating frequency of 100 Hz, the average output laser energy is 112 mJ, the energy stability is better than 8%, the pulse width is 10.8 ns, and the beam quality reaches 11 mm·mrad. This results can basically meet the requirements of multi-target and pseudo-random coded laser semi-active terminal guidance and fast target ranging for laser source excitation. © 2022 Editorial office of Journal of Applied Optics. All rights reserved.     

开关电源过流保护电路设计研究

本文研究了电源过流电路设计方案和特点以及一些常见的开关电源过流保护方式,寻找到良好的保护电路设计。     

脉冲激光器中储能电容的充电电源改进与仿真

在光电对抗系统中,高能量脉冲固体激光器是关键组件。储能电容的充电电源是高能量脉冲固体激光器的核心组成部分。现有固体激光器产品中,储能电容的充电电源采用硬开关拓扑结构,电磁辐射强、电源效率70%左右。为满足产品更严格电磁兼容性和更高电源效率的要求,制定了工作于断续电流模式下串联谐振全桥变换器的充电电源改进方案,并进行了总体方案和单元电路的详细设计。然后,通过理论推导计算和Saber软件仿真,证明了工作于断续电流模式下串联谐振全桥变换器具有软开关特性和内在恒流特性,电磁辐射低,电源效率可达80%以上,充电频率可达5 Hz,满足产品改进需求,为后续实际充电电源设计与调试提供了理论依据。     

一种小型化半导体激光器温控电路的设计

为了满足激光器小型化的需求，设计了一种小尺寸的半导体激光器温度控制电路。电路采用内置半桥的DC-DC转换芯片SY8368AQQC作为半导体制冷器的驱动，采用STM32F302K8U6作为主控芯片，内置PID算法。最终实现了电路的小型化，尺寸可以做到30 mm×30 mm,同时也能达到理想的控制效果。实验结果表明，该电路的温度控制精度可以到±0.1℃。