| 摘要 |
A piezoelectric loudspeaker driving device comprises a driving amplification unit, a signal tuning unit and a piezoelectric loudspeaker, wherein the driving amplification unit is configured to amplify a signal source and output an amplified signal to the signal tuning unit; and the signal tuning unit is configured to filter the amplified signal for filtering out a high-frequency noise, adjust an impedance characteristic of piezoelectric ceramics for increasing the load impedance of a driving circuit at a high-frequency portion and reducing a driving current at a high-frequency band, and output an adjusted driving signal to the piezoelectric loudspeaker for driving the piezoelectric loudspeaker. The signal tuning unit comprises a low-pass filtering circuit and an adjustment impedance. With the piezoelectric loudspeaker driving device in the embodiments of the present invention, improvement of the playback tone quality of the piezoelectric loudspeaker at the high-frequency portion is simply realized without adjusting the structure and assembly of the piezoelectric loudspeaker, and the problems of increased driving power consumption and self-excitation of the circuit caused by low impedance at the high-frequency band of piezoelectric ceramic elements are alleviated. |
