一种用于极性反转热电能量收集的升降压转换器

A Buck-Boost Converter for Polarity-Reversed Thermoelectric Energy Harvesting

针对传统TEG能量收集系统输入电压单一化与可用功率范围较窄的问题,提出了一种适用于极性反转热电能量收集的升降压DC-DC转换器。采用双极性输入升降压拓扑结构,能够自适应收集双极性输入热电能量,并增加储能升降压回路,有效拓宽了重载下可用功率范围,保证输出电压稳定性,并在轻负载时收集多余能量,显著提高轻载转换效率,保证系统续航能力。最大功率追踪方法采用结构简单、追踪效率较高的开路电压法。180 nm CMOS工艺仿真验证表明,所提出的能量收集系统轻重负载条件下转换效率均高于85%,最高转换效率为93.26%(V_(TEG)=500 mV,R_(S)=210Ω),最大功率追踪效率达到99.52%(V_(TEG)=-600 mV),电路最低工作输入电压为±25 mV,且重负载下1.8 V输出电压纹波小于30 mV。

Aiming at the problem of single input voltage and narrow available power range in traditional TEG energy harvesting system,a DC-DC converter suitable for polarity reversal thermoelectric energy harvesting is proposed.The bipolar input buck-boost topology can adaptively collect bipolar input thermoelectric energy,and increase the energy storage buck-boost circuit,which effectively broadens the available power range under heavy load,ensures the stability of output voltage,and collects multiple buck-boost energy under light load,significantly improves the conversion efficiency of light load and ensures the endurance of the system.The maximum power tracking method adopts the open circuit voltage method with simple structure and high tracking efficiency.The 180 nm CMOS process simulation results show that the conversion efficiency of the proposed energy harvesting system under light and heavy load conditions is higher than 85%,the maximum conversion efficiency is 93.26%(V_(TEG)=500 mV,R_(S)=210Ω),the maximum power tracking efficiency is 99.52%(V_(TEG)=-600 mV),the minimum operating input voltage of the circuit is±25 mV,and the 1.8 V output voltage ripple under heavy load is less than 30 mV.