Current sensor and overload current protective device therewith

Details Current sensor and overload current protective device therewith Current sensor and overload current protective device therewith

2006-01-10

2006-01-10

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S11700H, C324S207130, C351S044000, C351S087000, C351S115000

Reexamination Certificate

active

06984989

ABSTRACT:
A small, low-cost, wide-range current sensor excellent in environmental resistance and noise resistance and high in accuracy, and an application device, a DC magnetic field is applied to two magnetic elements (1a,1b) having a magnetic impedance effect by means of a magnet (3), while a negative feedback magnetic field is applied to both elements by means of a coil (2). The variation of the magnetic field depending on the external magnetic field applied to the magnetic elements (1a,1b) is detected by detection units (7a,7b). The difference between the output is amplified by a differential amplifier unit (8). Thus, detection is achieved in a wide range while eliminating the influence of the noise.

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