Verification of the effectiveness of a converter with adjustable input resistance for an electromagnetic induction type vibration power generator in a white noise environment

Abstract

Vibration power generators that generate power from environmental vibrations are attracting attention as independent power sources for IoT sensors and the like. We have evaluated the power of an electromagnetic induction type vibration power generator connected to a load resistance when the environmental vibration is a sine wave and white noise. However, we did not evaluate the effect on the generated power of the converter that converts the AC output of the vibration power generator into a DC output. There have been several studies on converters connected to vibration power generators. It has been reported that a buck-boost converter can adjust the input resistance when the environmental vibration is a sine wave. However, there have been no reports on whether the input resistance can be adjusted when the environmental vibration is white noise. In an electromagnetic induction type vibration power generator, the resistance to maximize power is very different between a sine wave and white noise. Therefore, whether or not the converter input resistance can be adjusted even in the case of white noise is an important issue. We made a prototype converter with buck-boost capabilities and adjustable input resistance. The prototype was connected to an electromagnetic induction type vibration power generator, and the DC power for white noise with different acceleration levels was evaluated. As a result, we confirmed that the prototype converter was effective when the environmental vibration was white noise.