应用于弱能量收集的低功耗DC-DC升压转换器

Low Power DC-DC Boost Converter for Weak Energy Harvester

设计了一种应用于能量收集领域的低功耗、超低电压DC-DC升压转换器。研究了转换器工作频率与功率和效率的关系,通过选择合适的脉冲宽度调制(PWM)频率来提高输出功率。通过适当提升转换器开关功率管的栅极电压,减小了晶体管的泄露电流,从而提高了输出电压。基于CMOS 65nm工艺进行设计。仿真结果表明,提出的方案能提高弱能量转换效率。当输入电压为100mV时,最大输出电压为1 000mV。DC-DC升压转换器的输出功率为3.08μW,转换器控制单元的功耗为697nW,转换效率达到57.3%。

A low power and ultra-low voltage DC-DC boost converter for energy harvesting was designed.On the one hand,by studying the relationship between the working frequency of the converter and power or efficiency,the appropriate pulse width modulation (PWM)frequency was selected to improve the output power.On the other hand,the leakage current of the transistor was reduced by properly raising the gate voltage of the converter switching power transistor,thus the output voltage was increased.The DC-DC boost converter was designed in a 65 nm CMOS process.Simulation results showed that the proposed scheme had the ability for increasing the conversion efficiency of weak energy harvesters.When the input voltage was 100mV,the maximum output voltage was 1 000 mV.The output power of the DC-DC boost converter was 3.08μW,the power consumption of the converter control unit was 697nW,and the conversion efficiency was 57.3%.