应用于能量收集中的接口电路的设计

Design of Interface Circuit Used in Energy Harvesting

针对从周围环境中收集能量的微型发电机输出功率和电压非常小,无法直接应用的问题。文中设计了一种超低输入电压、低功耗且高效的接口电路。该接口电路包含两级,第一级是无源级和仅由一个有源二极管组成的第二级。为降低有源二极管的功耗,采用一个工作在亚阈值区的衬底输入比较器用来驱动MOS开关。设计采用TSMC 0.18μm标准CMOS工艺,使用Cadence Spectre在室温的条件下进行仿真。结果表明,在输入电压为500 m V(100 Hz),负载电阻为50 kΩ时整流器的电压转换率为97.7%,能量转换率为91.3%。整流器能够在输入电压振幅为320 m V以上实现高效整流。

The output power and voltage of micro harvesting generators is usually low,can not be directly applied.Design of a highly efficient,low-power and ultra-low-voltage interface circuit.A two-stage concept is used including a first passive stage and only one active diode as second stage.In order to reduce the power consumption of the active diode,a bulk-input comparator working in the sub threshold region is used to drive the switch of the active diode.Based on standard TSMC0.18μm CMOS technology,the following simulations are carried out using Cadence Spectre at room temperature.The simulation results show that the voltage efficiency of97.7%and the power efficiency of91.3%when the input voltage is500mV(100Hz)with a load resistance of50kΩ.Rectifier can achieve high efficiency in the input voltage amplitude above of320mV.