OVERCURRENT DETECTION DEVICE

PROBLEM TO BE SOLVED: To provide a compact and low-priced overcurrent detection device that can measure a load current and detect an overcurrent without a current sensor and a shunt resistance. SOLUTION: A drain-source voltage of a load drive FET 4 activating a load 3 is detected by an amplification...

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Bibliographische Detailangaben
1. Verfasser:	YAMANE TOSHINORI
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a compact and low-priced overcurrent detection device that can measure a load current and detect an overcurrent without a current sensor and a shunt resistance. SOLUTION: A drain-source voltage of a load drive FET 4 activating a load 3 is detected by an amplification circuit 5 and also a temperature of the FET 4 is measured by a temperature measuring circuit 8. Then, a current value flowing in the load 3 based upon the drain-source voltage and the temperature is calculated by a load current calculating means placed in a microcomputer 9 and an overcurrent is detected.