The Characteristic Research Of Piezoelectric And Magnetic Vibration Energy Harvesting Structure

The vast reduction in size and power consumption of CMOS circuitry has led to a large research effort based around the vision of ubiquitous Low-power devices. As many low power wireless electronic devices, which are usually designed to run on batteries, increase in number and the devices decrease in size now, the replacement of depleted batteries is not practical. Methods of scavenging ambient power for use by low power wireless electronic devices have been explored in an effort to make these wireless devices indefinitely self-contained. After a broad survey of potential energy scavenging methods, the conversion of ambient vibrations to electricity was chosen as a method for further research.Converters based on piezoelectric and magnetic were pursued. And the type of converters which based on piezoelectric and magnetic were carefully modeled. Designs were optimized based on the models developed. Test results from the piezoelectric and magnetic converters demonstrate power densities of about 200μW/cm3 from input vibrations of 2 m/s2 at 100 Hz. Compared with the converters only based on piezoelectric or magnetic, the outputs of converters based on piezoelectric and magnetic were larger. Furthermore, test results matched simulated outputs very closely thus verifying the validity of the model as a basis for design.