ANALOG-DIGITAL CONVERTER PROTECTING DEVICE

PURPOSE:To cut off a negative voltage of a sensor output, by connecting an AC driven sensor to ground via a diode. CONSTITUTION:A rectangular wave from a terminal 6 of a microcomputer 1 is applied to a series circuit comprising a sensor S1 and a resistor R1 via a transistor TR1 and a capacitor C1 an...

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Bibliographische Detailangaben
Hauptverfasser:	HARIMA KATSUNORI, OOSHIMA KOUSEI, WASHIMI YUUJI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING CODE CONVERSION IN GENERAL CODING COMPUTING COUNTING DECODING ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY PHYSICS
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Beschreibung
Zusammenfassung:	PURPOSE:To cut off a negative voltage of a sensor output, by connecting an AC driven sensor to ground via a diode. CONSTITUTION:A rectangular wave from a terminal 6 of a microcomputer 1 is applied to a series circuit comprising a sensor S1 and a resistor R1 via a transistor TR1 and a capacitor C1 and a connecting point voltage is fetched from a terminal 11. A voltage at the terminal 11 is rectified and smoothed and converted into a digital signal with a sequential comparison type AD converter (built in the microcomputer 1). The series circuit comprising the sensor S1 and the resistor R1 is connected to a ground terminal via a diode D2. Since the voltage at the terminal 11 is not negative, the microcomputer 1 is protected.