| 摘要 |
PURPOSE:To prevent the stepping noise of a compressor by combining waveform data table and frequency table, reading the waveform data of a waveform data table according to a combination sequence in response to an operating frequency, and repeating it to obtain a pattern of the operating frequency responsive to an operation frequency command. CONSTITUTION:When the operating frequency command of a compressor 7 is output, table numbers A-E of predetermined combination sequence of a frequency table 10 is read in response to the frequency, and the waveform data of a waveform data table 9 is sequentially read according to the table numbers A-E. Then, a transistor of a power transistor section 4 for driving the compressor 7 on the basis of the read waveform data is turned ON/OFF for a predetermined period. The reading of the waveform data is repeated according to the table numbers A-E of predetermined combination to obtain a pattern of the operating frequency of the compressor 7 as a target operating frequency. |
