Current detecting circuit and actuator driving apparatus

Details Current detecting circuit and actuator driving apparatus Current detecting circuit and actuator driving apparatus

2002-12-03

2008-09-09

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S152000, C361S154000

Reexamination Certificate

active

07423857

ABSTRACT:
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 (161to16n) 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.

REFERENCES:
patent: 4078215 (1978-03-01), Vinson
patent: 5933313 (1999-08-01), Furukawa
patent: 5936563 (1999-08-01), Nakamura
patent: 6336448 (2002-01-01), Furuhata et al.
patent: 6892443 (2005-05-01), Szwarc et al.
patent: 02-045768 (1990-02-01), None
patent: 2-128964 (1990-10-01), None
patent: 08-240277 (1996-09-01), None
patent: 09-130004 (1997-05-01), None

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