Current sensing circuit

Details Current sensing circuit Current sensing circuit

1990-08-29

1992-05-12

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307571, 323316, H03K 5153, H03K 524, H03K 1708, H03K 1718

Patent

active

051130890

ABSTRACT:
A sensing circuit is disclosed wherein a first MOS transistor is connected in series with a load to produce a source to drain voltage in response to the load current. A reference voltage generating circuit includes a second MOS transistor and provides a reference voltage determined by the source-to-drain voltage of the second MOS transistor in response to a constant current supplied thereto. A comparator circuit compares the source to drain voltage of the first MOS transistor with the reference voltage to sense the load current.

REFERENCES:
patent: 4518869 (1985-05-01), Herold
patent: 4553084 (1985-11-01), Wrathall
patent: 4672238 (1987-06-01), Nemoto
patent: 4686383 (1987-08-01), Croft
patent: 4820968 (1989-04-01), Wrathall
patent: 4827207 (1989-05-01), Chieli
EDN 1986 "Sense-cell MOSFET eliminates losses in source circuit", Warren Schultz: June. 26, 1986.

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