| 摘要 |
PURPOSE: An encoder multiplier using a high speed micom and a multiplying method of thereof is provided, in which a device is easily controlled by selecting multiplication through measurement of minimum and maximum values, to be capable of counting an exact length, and to prevent an error and a shaking at a smooth curve of sine wave. CONSTITUTION: The first overvoltage protecting part(100) interrupts an overvoltage with regard to an A phase of an input sine wave, and the second overvoltage protecting part(110) interrupts an overvoltage with regard to a B phase of the input sine wave. A reference voltage generator(120) generates a reference voltage by adjusting a voltage through each protecting part. The first voltage divider(130) divides an output voltage of the first overvoltage protecting part, and the second voltage divider(140) divides an output voltage of the second overvoltage protecting part. An analog-to-digital converter(170) converts an output voltage of each divider into a digital signal. The first voltage comparator(150) compares an output voltage of the first overvoltage protecting part with the reference voltage, and generates an interrupt as a comparison result. The second voltage comparator(160) compares an output voltage of the second overvoltage protecting part with the reference voltage, and generates an interrupt as a comparison result. A microcomputer(180) receives an output signal of the converter as a synchronous clock, and multiplies an input signal according to the interrupts of the first and the second voltage comparator. A back-up power supply part(190) supplies a power to the microcomputer.
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