Due to the large size

environmental pollution and requirement of periodically replacement

the classic batteries are no longer suitable for field work nowadays. Micro-wind energy harvesting by vortex-induced vibration can harvest the wind energy

and power the micro electric equipment such as wireless sensor nodes. Derived from the Buck-Boost circuit

a new energy interface circuit is designed for the micro-wind energy harvesting device. After theoretical analysis and simulation

there is an optimal duty cycle in the proposed circuit

which corresponds to the maximum output power. A control algorithm is developed with LabVIEW platform. Experimental results show that the proposed circuit and control algorithm can achieve the optimal duty circle

and keep the micro-wind energy harvesting outputs at its maximum power.