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The digital output signal from the output abnormal distinction mannered null digital operation circuit of the analog
The digital output signal from the output abnormal distinction mannered null digital operation circuit of the analog
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机译:来自输出异常区别的数字输出信号归类为模拟的空数字运算电路
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摘要
PROBLEM TO BE SOLVED: To provide an analog output circuit that reliably detects abnormality in a digital/analog converter and the like and is inexpensive, and to provide a mass flow rate control device that uses it.;SOLUTION: The circuit is an analog output circuit that outputs an analog signal based on a digital output signal from a digital arithmetic circuit, via a digital/analog converter and a gain circuit. The digital arithmetic circuit incorporates a pulse wide modulator and an analog/digital converter. A DAC output signal from the digital/analog converter and a PWM signal having been made at a constant voltage via a low-pass filter based on an output of the pulse wide modulator are input into an addition-subtraction circuit. The addition-subtraction circuit outputs the addition-subtraction result of the DAC output signal and the PWM signal to the analog/digital converter. The digital arithmetic circuit outputs an abnormality signal, on the basis of the addition-subtraction result.;COPYRIGHT: (C)2009,JPO&INPIT
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