POWER SOURCE VOLTAGE PROTECTIVE DEVICE AND POWER SOURCE VOLTAGE PROTECTION METHOD

A microcomputer 10 is equipped with a CPU 13 and an AD converter 15. The AD converter 15 is supplied with the same power source voltage as the CPU 13, and converts a reference voltage Vref into digital data using the received power source voltage and outputs the digital data as a conversion value. T...

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Bibliographische Detailangaben
Hauptverfasser:	OCHI NOBUCHIKA, IKEDA ATSUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A microcomputer 10 is equipped with a CPU 13 and an AD converter 15. The AD converter 15 is supplied with the same power source voltage as the CPU 13, and converts a reference voltage Vref into digital data using the received power source voltage and outputs the digital data as a conversion value. The CPU 13 detects a state of the power source voltage by calculating a voltage variation of a power source voltage for ordinary operation on the basis of a first conversion value obtained by AD-converting the reference voltage Vref by the AD converter 15 in a state that a standard power source voltage Vcc including no voltage variation is supplied to the AD converter 15 and a second conversion value obtained by AD-converting the reference voltage Vref by the AD converter 15 in a state that the power source voltage for ordinary operation is supplied to the AD converter 15.