| 摘要 |
PURPOSE:To protect a compressor and to increase the reliability of a system by independently operating a carrier period, data unit timer, and simultaneously switching the carrier period and data unit timer. CONSTITUTION:The same reference oscillating frequencies are inputted to two microcomputers 5, 6 by a reference frequency oscillator 7 as a system clock, and the microcomputer 5 generates a carrier period Tphi by its own signal generating means for a motor rotating frequency command (f-set). Then, the signal is outputted to the second microcomputer 6, and outputs T2 data for data unit timer T2 signal formed by the second microcomputer 6. Then the microcomputer 6 outputs a PWM signal to a motor. |
