Current detecting circuit and actuator driving apparatus

By switching the NMOS ( 11 ) on and off, a drive current passes through a solenoid ( 15 ). The drive current passes through a conversion circuit ( 16 ), and an amplifier circuit ( 17 ) outputs a current detection result by amplifying the output voltage of the conversion circuit ( 16 ). Because a plu...

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Bibliographic Details
Main Authors SATOH KIYOKATSU, KUROSU YASUO
Format Patent
LanguageEnglish
Published 09.09.2008
Subjects
BASIC ELECTRIC ELEMENTS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
EMERGENCY PROTECTIVE DEVICES
GENERATION
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
RELAYS
SELECTORS
TESTING
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Summary:By switching the NMOS ( 11 ) on and off, a drive current passes through a solenoid ( 15 ). The drive current passes through a conversion circuit ( 16 ), and an amplifier circuit ( 17 ) outputs a current detection result by amplifying the output voltage of the conversion circuit ( 16 ). Because a plurality of resistor elements ( 16 1 to 16 n) that constitute the conversion circuit ( 16 ), together with elements that constitute the amplifier circuit ( 17 ) are formed diffused to a semiconductor substrate ( 100 ), even if the attribute changes by the conversion circuit ( 16 ) generating heat, by the drive current, the amplifier circuit ( 17 ) becomes approximately the same temperature, and the attribute changes. Therefore, a highly accurate current detection becomes possible without using components for temperature correction.
Bibliography:Application Number: US20040495015