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.

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A vibration power generator produce electricity using environmental vibration, such as floor vibration caused by people walking, vibration caused by cars and trains, and factory piping vibrations. Electric power generated by the vibration power generator is expected to be an alternative to a power source (a battery or the like) used in IoT sensor or the like. There are various types of vibration power generation such as electromagnetic induction type, magnetostriction type, piezoelectric type and electrostatic type. We are paying attention to electromagnetic induction type among them. There have been many studies on electromagnetic induction type vibration power generators, and it can be expected that the generated power will increase depending on each application. However, there are few studies to increase the generated power in the simple configuration of the vibration generator, that is, the configuration using the one-degree-of-freedom oscillator consisting of the magnetic circuit and the spring. Therefore, we constructed a mathematical model that formulated the effect of the magnetic parameters of a vibration generator using a one-degree-of-freedom oscillator on the generated power, and obtained design guidelines for a magnetic circuit for increasing the generated power. Furthermore, the validity of the model was evaluated by comparing the power generation performance test using the prototype and the calculation.

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