MOBILE TERMINAL HAVING AN AUXILIARY CHARGING DEVICE USING PIEZOELECTRICITY, ESPECIALLY CONCERNED WITH GENERATING CHARGING CURRENT FROM VIBRATIONS, NOISES OR ELECTROMAGNETIC WAVES, APPLIED FROM THE EXTERNAL, USING PIEZOELECTRICITY

摘要

PURPOSE: A mobile terminal having an auxiliary charging device using piezoelectricity is provided to use the current generated through the resonance of a piezoelectric element as auxiliary charging current. CONSTITUTION: An auxiliary charging device using piezoelectricity comprises a piezoelectric element(1) and a rectifier circuit(2). The piezoelectric element(1) raises resonance for an externally applied frequency, equal or similar to intrinsic frequency, and supplies current to an external circuit. The rectifier circuit(2) rectifies the alternating current supplied from the piezoelectric element(1) into direct current and supplies the direct current to battery charging terminals(3). The output terminals of the piezoelectric element(1) are connected to the rectifier circuit(2). The output terminals of the rectifier circuit(2) are connected to the battery charging terminals(3).