Power generating device using broadband noise

The utility model provides a device capable of effectively absorbing sonic waves, reducing noise and converting the noise into electric energy. An external ear structure, a middle ear structure and an internal ear structure are simulated according to bionic principle. The power generating device is provided with a resonant cavity, a piezoelectric film, a rear cavity and an energy storage device. The piezoelectric film is positioned between the resonant cavity and the rear cavity and fixed by two circular polycarbonate clamping plates, a plurality of concentric holes with certain diameters are fixed onto the clamping plates, the piezoelectric film consists of four 20-micrometer polyvinylidene fluoride (PVDF) piezoelectric films in series connection, and an electrode lead is led out by the aid of electrode metal layer evaporation technique. Outputted signals of the piezoelectric film is used for charging a double-electric-layer capacitor after passing a rectifying circuit, and an electric energy conversion circuit is fixedly mounted inside a casing. A plurality of power generating device using noise can be connected in parallel or in series for use according to specific needs to provide needed power supplying voltage, current and the like, the power generating device is convenient in installation and use, has a frequency range between 2Hz and 1000kHz, and is applicable to an environment with higher noise, such as an airport, subway, stadium, highway and the like, and generated electric power can be used for illumination and the like after conversion and storage.