| US 7,564,164 B2 | ||
| Drive circuit for piezoelectric pump and cooling system that uses this drive circuit | ||
| Mitsuru Yamamoto, Minato-ku (Japan); Sunao Hamamura, Minato-ku (Japan); Yasuhiro Sasaki, Minato-ku (Japan); and Sakae Kitajo, Minato-ku (Japan) | ||
| Assigned to NEC Corporation, Tokyo (Japan) | ||
| Appl. No. 10/590,081 PCT Filed Feb. 01, 2005, PCT No. PCT/JP2005/001389 § 371(c)(1), (2), (4) Date Aug. 21, 2006, PCT Pub. No. WO2005/080793, PCT Pub. Date Sep. 01, 2005. |
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| Claims priority of application No. 2004-046168 (JP), filed on Feb. 23, 2004. | ||
| Prior Publication US 2007/0242427 A1, Oct. 18, 2007 | ||
| Int. Cl. H01L 41/09 (2006.01) | ||
| U.S. Cl. 310—317 | 17 Claims |
| 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.
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