一种基于自适应电荷泵的多源能量收集芯片

An Adaptive Charge Pump-Based Multi-Source Energy Harvesting Chip

采用标准0.18μm CMOS工艺,设计了一种可以同时高效收集压电、光电、热电、射频能量的多源能量收集芯片。该收集芯片由多种能源接口电路、可重构电荷泵和自适应控制电路等单元构成。可重构电荷泵中,通过调节电压转换倍率和开关工作频率来降低电荷再分配损耗,提高了转换效率,扩大了输入电压范围。自适应控制电路中,采用固定导通时间法控制系统的输出电压,所产生的峰值电压被复用,并用来控制电荷泵的工作状态,降低了电路的复杂度和功耗。仿真结果表明,该收集芯片的整体动态功耗为33μW,能量转换效率最高为60.3%。版图尺寸为1672μm×1990μm。

A multi-source energy harvesting chip was designed in a standard 0.18μm CMOS process,which could efficiently collect piezoelectric,photoelectric,thermoelectric and RF energy simultaneously.The collecting chip consisted of a variety of energy interface circuits,a reconfigurable charge pump and an adaptive control circuit.In the reconfigurable charge pump,the charge redistribution loss was reduced by adjusting the voltage conversion rate and switching frequency,the conversion efficiency was improved,and the input voltage range was expanded.In the adaptive control circuit,the output voltage of the system was controlled by the constant on-time method,and the peak voltage generated was multiplexed to control the working state of the charge pump,which reduced the complexity and power consumption of the circuit.The simulation results showed that the overall dynamic power consumption of the chip was 33μW,and the maximum energy conversion efficiency was 60.3%.The layout size was 1672μm×1990μm..