摘要
压电换能器通常输出微弱,使用辅助电源的自供电控制电路功耗大,其电源管理电路启动阈值高,启动速度慢,转换效率低。对同步电荷提取(SECE)电路进行建模和理论推导,提出了一种间歇性自供电控制电路原理。根据SECE电路输出的最大功率点,间歇性地给控制电路非常短时间供电,并解决了间歇供电易造成逻辑混乱的问题,大幅度减小自供电电路的功耗,提高电路的效率,电路在极低输入功率下也能快速启动。实验结果表明,在压电换能器输出21 Hz、3.6 V电压时,控制电路功耗低至0.19μW,是常规控制电路总功耗的1/134;管理电路的启动功率阈值仅为0.39μW,低于通常电路的1/14。该控制电路的工作原理也适用于其他容性内阻换能器的微弱能量采集和高效管理电路。
Due to weak output of piezoelectric transducer and high-power consumption of self-powered control circuits using auxiliary power supplies,the power management circuits have high start-up thresholds,slow start-up speeds and low efficiencies.Based on theoretical modelling and derivations of the synchronous electric charge extraction(SECE)circuit,an intermittently self-powered control circuit principle is proposed.The control circuit is intermittently powered for a very short period near the maximum power point of the SECE circuit,resolving possible logic errors caused by intermittent power supply.The circuit significantly reduces the power consumption of the control circuit,with efficiency improved,and can quickly start-up when the input power is very low.Experimental results show that,when the transducer outputs a 21 Hz,3.6 V sinusoidal signal,the power consumption of the control circuit can reach as low as 0.19μW,approximately 1/134 that of conventional control circuits.The start-up threshold of the circuit can be as low as 0.39μW,lower than 1/14 that of the typical management circuits.The operating principle of the control circuit can be extended to other weak energy harvesting circuits with capacitive internal resistance transducers.
作者
罗志春
李平
王国达
文玉梅
LUO Zhichun;LI Ping;WANG Guoda;WEN Yumei(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2021年第2期150-156,共7页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(61531008,61527813,61973217)。
关键词
微弱压电能量采集
自供电
SECE
超低启动阈值
高效管理电路
weak piezoelectric energy harvesting
self-powered
SECE
ultra-low start-up threshold
efficient management circuit
