| 摘要 |
The control device detects vibration signal from a compressor and reduces a vibration noise. The control device includes a bandpass filter (31) which passes the source frequency of piezo ceramic sensors (24A,24D), a comparator (32) which generates rectangular waves, a differentiator (33) which outputs synchronous signal by differentiating output signal of comparator (32), a micom (34) which controls a system, a low pass filter (35) which converts rectangular wave into sine wave, and an amplifier (36) which drives piezo ceramics (26A)(26B)(26C)(26D) by output signal of lowpass filter (35).
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