适用于激光温控的动态双模切换Buck/Buck-Boost换流拓扑

Dynamic dual-mode switching Buck/Buck-Boost convert topology for laser temperature control

在半导体激光温控电源领域中,一直缺乏既能加热又能制冷的高效率温控电路,根据Buck和Buck-Boost换流拓扑中二极管和电感的对偶性,采用多功能切换开关将二者动态交换位置,提出了一种动态双模切换的Buck/Buck-Boost换流拓扑。该换流拓扑可根据温度反馈信号,动态切换在Buck或Buck-Boost模式下,输出正向电压或负向电压驱动TEC(半导体制冷器),控制激光器在环境温度变化时始终工作在恒温状态下。在saber软件中对Buck/Buck-Boost换流拓扑进行了变模仿真分析,得出该拓扑在变模的同时可自由调节输出幅度,在此基础上研制了一种双向温控电源,实验表明,该电源的转换效率在加热和制冷模式下均高于90%,温控精度达到0.06℃,验证了该换流拓扑的有效性。采用该技术对中大功率激光器恒温控制具有节能、体积小、环境适应性强等技术优势,同时该双模拓扑的提出对开关换流拓扑发展提供了一定参考。

In the field of semiconductor laser temperature control power supply,there is a lack of highefficiency temperature control circuit that can both heat and cool. according to the duality of diode and inductor in Buck and Buck-Boost convert topology,the Position of diode and inductor are dynamically exchanged by a multi- function switch,a double- mode dynamic switching Buck/Buck- Boost convert topology is proposed. The convert topology can be dynamically switched in Buck or Buck-Boost mode according to the temperature feedback signal,so it outputs a forward voltage or a negative voltage to drive the TEC(Thermoelectric Cooler),and control laser is always operated at a constant temperature when the ambient temperature changes. The Buck/Buck- Boost convert topology was simulated and analyzed in saber software,it is concluded that the topology can be freely adjusted while the mode is changing,based on this,a bidirectional temperature-controlled power supply is developed,the conversion efficiency of the power supply is higher than 90% in both modes,and the temperature control accuracy reaches 0.06 ℃,which verifies the effectiveness of the convert topology. The technology has the advantages of energy saving,small volume and strong environmental adaptability for the medium and high power laser constant temperature control. At the same time,the proposed dual mode topology provides a reference for the development of switching convert topology.