Power source voltage protective device and power source voltage protection method

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

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Bibliographische Detailangaben
Hauptverfasser:	OCHI NOBUCHIKA, IKEDA ATSUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRICITY ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS SYSTEMS FOR STORING ELECTRIC ENERGY TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	A microcomputer is equipped with a CPU and an AD converter. The AD converter is supplied with the same power source voltage as the CPU, and converts a reference voltage into digital data using the received power source voltage and outputs the digital data as a conversion value. The CPU 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 by the AD converter in a state that a standard power source voltage including no voltage variation is supplied to the AD converter and a second conversion value obtained by AD-converting the reference voltage by the AD converter in a state that the power source voltage for ordinary operation is supplied to the AD converter.