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便携式中小型功率半导体激光器(LD)具有低电压驱动、激励方式安全、效率高等特性,广泛应用于远距离通讯、激光测距、全息应用等场合。LD稳定的光功率输出和便携性需要驱动电源具有高稳定性和较小的体积,同时要求恒定的电流输出。以同步降压(SR-BUCK)拓扑结构配以高效控制器为核心,设计了电流可调的高精度双通道恒流源驱动系统。本恒流源采用PI调节的电流闭环负反馈系统,加入电压扰动前馈,对输出电流进行比较、调整,提高了系统的精度。同时,完成了系统的数学建模和仿真,并对系统进行测试与评估。测试结果表明,该恒流源具有整机效率高、动态响应时间快(<10ms),输出容量高(300W)、系统稳定(无超调)、纹波系数低(<0.075%)、调节范围大(0-12A)、抗干扰能力强等优点。
Small and medium-sized portable power semiconductor lasers (LDs) have the characteristics of low voltage driving, safe excitation and high efficiency. They are widely used in long-distance communications, laser ranging and holographic applications. The stable optical power output and portability of the LD require high stability and small volume of the drive power supply, as well as a constant current output. In this paper, an SR-BUCK high-efficiency constant current source drive system with adjustable current is designed with synchronous buck (SR-BUCK) topology and high efficiency controller. The constant current source uses a PI closed-loop closed-loop current feedback system, adding voltage disturbance feed-forward to compare and adjust the output current to improve the accuracy of the system. At the same time, completed the system mathematical modeling and simulation, and test and evaluation of the system. The test results show that the constant current source has the advantages of high efficiency, fast dynamic response time (<10ms), high output capacity (300W), stable system (no overshoot), low ripple coefficient Large (0-12A), anti-interference ability and so on.