To overcome the shortcomings of the interface circuit for a piezoelectric generator in load matching and circuit losses, an improved passive Synchronous Charge Extraction(SCE)interface for the piezoelectric generator was proposed. Furthermore, by taking advantage of the passive electronic switch on maxima and the single-end flyback converter, the voltage across the piezoelectric element was reversed according to the control topology to output a constant power independent with the resistance. Simulated with the Multisim, the constant output power of the improved passive SCE circuit reaches 1. 83 mW. Moreover, the electricity generating capacity measurements were conducted with the measuring system for the vibration-based piezoelectric generator. As shown in the experiments, the harvested power with the passive SCE circuit is 1. 135 mW,which is 2. 98 times of the 0. 381 mW from the standard circuit.%为了克服压电振动发电机接口电路中负载匹配及电路损耗问题,提出了一种改进的无源同步电荷提取电路.利用无源峰值检测开关电路及单端反激变换电路,使压电振动发动机中压电元件两端电压适时反向,从而输出与负载大小无关的恒定功率.使用Multisim进行电路仿真,仿真结果表明该无源同步电荷提取电路输出功率为1.83 mW,且不存在最优负载问题.搭建了压电振动发电机实验平台,分别对无源同步电荷提取电路及经典电路进行发电性能测试,结果表明,无源同步电荷提取电路实际输出功率达到1.135 mW,是经典电路实际输出功率0.381 mW的2.98倍.
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