| 摘要 |
PURPOSE:To cope with control of any specification merely by altering the program by a method wherein a soft starter is formed by a program. CONSTITUTION:The output of a carrier voltage generator 215 is connected to one input terminal of a multiplication type D/A converter 221, and a CPU 1 is connected to the other input terminal. The output terminal of the converter 221 is connected to the non-inversion input terminal of a comparator 217 through a resistor 216, and any signals of U, V, W phases of sine waves is input to the other inversion input terminal through a resistor 219. The output of the comparator 217 is supplied to a power converter through a terminal 220. Data for maximizing the output value of an analog signal is applied from the CPU 1 to the converter 221. A soft start can be performed by gradually reducing the data. |
