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Conventional SSHI (synchronized switch harvesting on inductor) has beenbelieved to be one of the most efficient interface circuits for piezoelectricvibration energy harvesting systems. It employs an inductor and the resultingRLC loop to synchronously invert the charge across the piezoelectric materialto avoid charge and energy loss due to charging its internal capacitor ($C_P$).The performance of the SSHI circuit greatly depends on the inductor and a largeinductor is often needed; hence significantly increases the volume of thesystem. An efficient interface circuit using a synchronous charge inversiontechnique, named as SSHC, was proposed recently. The SSHC rectifier utilizescapacitors, instead of inductors, to flip the voltage across the harvester. Fora one-stage SSHC rectifier, one single intermediate capacitor ($C_T$) isemployed to temporarily store charge flowed from $C_P$ and inversely charge$C_P$ to perform the charge inversion. In previous studies, the voltage flipefficiency achieves 1/3 when $C_T = C_P$. This paper presents that the voltageflip efficiency can be further increased to approach 1/2 if $C_T$ is chosen tobe much larger than $C_P$.

Analysis on One-Stage SSHC Rectifier for Piezoelectric Vibration Energy Harvesting