An efficient self-powered series synchronized switch harvesting on inductor（ ESPS-SSHI） circuit is presented. The proposed ESPS-SSHI circuit detects the positive and negative peaks of the open-circuit voltage of the piezoelectric element through a simplified passive peak detector. It not only reduces the energy consumption of the circuit

but also reduces the phase difference between the peak time of the open circuit voltage of the piezoelectric element and the switching action moment

which improves the efficiency of energy harvesting. The effectiveness of the designed circuit is verified by LTspice simulation and experiment

the maximum output power can be increased to 4. 5 times that of the standard energy harvesting（ SEH） circuit.