Composite energy harvesting technique is a self-powered sensor technology based on piezoelectric and electromagnetic energy harvesting technology. Analyze composite energy harvesting system

put forward mathematical models and discuss relationship between resonance frequency of system and system configuration parameters; design a set of piezoelectric and electromagnetic energy harvesting device

and experimental verification is cavried out. Results show that the given math model is close agreement with output characteristics of system. Under the resonance frequency of 18 Hz

the maximum of load power of the composite harvester achieves3. 8 m W which is increased by 19 % compared with 3. 2 m W of the single electromagnetic technique.