Standards Development

Scope

This international standard specifies a method for measuring power generation characteristics to evaluate and determine the output power, mechanical quality factor, electromechanical coupling factor, and output efficiency of piezoelectric devices used for self-sustaining power sources. This standard defines vibration-based test methods and characteristic parameters in order to accurately and practically evaluate the performance of piezoelectric devices.

Purpose

There are methods that piezoelectric devices and electromagnetic induction for vibration electric conversion, but methods using ceramic piezoelectric devices are prominent because of the output voltage, device size, and degree of structural freedom. The vibrations used in power generation in daily life have a wide variety of frequencies, and it is difficult to set conditions for obtaining an appropriate amount of power generation with piezoelectric devices that are highly frequency dependent. Piezoelectric device structures are also broadly divided into cantilever (beam), plate, and doublesupported beam shapes, and the sizes are diversified according to the purpose and application, and it is also difficult to set conditions.

For this reason, measurement of power generation performance of piezoelectric devices for selfsupporting power sources is performed arbitrarily, and what device structure (size, configuration, etc.) is used to determine what vibration (frequency, The circuit configuration (output voltage, current, conversion efficiency, measuring instrument, etc.) to be measured is not standardized. Both device producers and users want to establish a standard evaluation index, but as mentioned above, the range of use is wide, and standardization is not progressing.