基于单电感双输入双输出Boost-buck DC-DC的高转换效率能量收集电路

A high convert efficiency energy harvesting circuit based on single-inductor dual-input dual-output boost-buck DC-DC

基于TSMC 0.18μm CMOS工艺,设计了一种应用于物联网(IoT)无线传感器节点的双输入双输出高转换效率能量收集电路,在最大功率点跟踪技术和整流技术支持下实现对压电能(PZ)和热电能(TEG)两种能量源的自主能量收集.电路在轻载状态下,Boost升压回路对超级电容和负载供电,实现双路输出;在重载状态下,Boost升压和Buck降压回路同时对负载供电,弥补了能源不足的缺陷.通过引入非连续导通模式(DCM)、连续导通模式(CCM)的自主切换技术,有效减少电感上的电流反向泄漏,显著提高了电路转换效率.仿真结果表明峰值转换效率可达到90.6%.

Based on TSMC 0.18μm CMOS process,a high conversion efficiency energy harvesting circuit with dual-input and dual-outputwas designed for wireless sensor nodes of the Internet of Things(IoT).With the support of maximum power point tracking technology and rectification technology,the autonomously harvest energy from both piezoelectric energy(PZ)and thermoelectric energy(TEG)sources was realized.Under light load,the Boost circuit can supply power to the super-capacitor and the load to achieve dual output,and under heavy load,the Boost and Buck circuits supply power to the load at the same time to compensate for the energy shortage.By introducing the independent switching technology of discontinuous conduction mode(DCM)and continuous conduction mode(CCM),the reverse current leakage on the inductor is effectively reduced and the conversion efficiency of the circuit is significantly improved.The simulation results show that the peak conversion efficiency can reach 90.6%.