Patent ID: 7564164
Filing Date: 2009-07-21
Classification: F04B,G06F,H01L,Y02D

Abstract:
1. A piezoelectric pump drive circuit comprising: a sine wave oscillation means for generating a sine wave signal of the frequency that drives a piezoelectric element of a piezoelectric pump; a voltage-boosting means for converting a low-voltage supplied by one of a 5VDC power supply and a 12VDC power supply to a high voltage of one of approximately 140VDC and approximately 280VDC; and an amplification means driven by the high voltage generated by said voltage-boosting means for amplifying the signal supplied as output from said sine wave oscillation means and for driving said piezoelectric element by a high-voltage sine wave; wherein said amplification means is composed of: a D-class amplifier driven by a high voltage generated by said voltage-boosting means for subjecting the signal supplied as output from said sine wave oscillation means to pulse-width modulation to realize amplification; and a low-pass filter for demodulating the output signal of said D-class amplifier.