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环境中存在着丰富的电磁波能量,而人体运动产生的机械能则是一种不受外界干扰非常稳定的能源,这些能源的存在使设备为自身供电成为可能。由于射频电磁波能量和振动能量密度低的特性,设计了一种能够匹配低功耗低电压的复合能量收集与管理电路。该电路采用0.18μm标准CMOS工艺,对电源转化模块、电源调节模块(整流电路、滤波电路、升压电路,以及为升压电路提供时钟信号的振荡电路)和储能模块进行了分析与设计。整流电路的最低输入电压为200 m V,整流效率达到75%。升压电路采用新型电荷泵电路,具有4.8倍升压效果,输出电压最高达到970 m V,电压纹波率为0.5%。当输入电流为50μA时,该电路转换率为10%,输出平均功率为1.14μW。
The environment is rich in electromagnetic energy, and the mechanical energy generated by human motion is a very stable energy from the outside world interference, the existence of these energy makes it possible for the device to power itself. Due to the low energy density and low energy density of RF electromagnetic waves, a hybrid energy harvesting and management circuit is designed to match low power consumption and low voltage. The circuit uses 0.18μm standard CMOS technology to analyze and design the power conversion module, the power regulation module (rectifier circuit, filter circuit, boost circuit, and oscillation circuit for providing the clock signal of the step-up circuit) and the energy storage module. The commutation circuit has a minimum input voltage of 200 mV and a rectification efficiency of 75%. Boost circuit using a new charge pump circuit, with a boost effect of 4.8 times, the output voltage up to 970 mV, voltage ripple rate of 0.5%. When the input current is 50μA, the circuit conversion rate of 10%, the average output power of 1.14μW.