Structure of current measuring circuit

Details Structure of current measuring circuit Structure of current measuring circuit

1998-06-05

2000-01-04

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327538, G01R 1900

Patent

active

060114134

ABSTRACT:
A current-measuring circuit is provided which is designed to measure the current flowing through an electric load and a switching transistor. The current-measuring circuit includes a current-measuring device. The current-measuring device includes a current-measuring transistor and a voltage control circuit. The current-measuring transistor is disposed in parallel to the switching transistor and allows the current to flow therethrough that is proportional to the current flowing through the electric load and the switching transistor and that is used to measure the current flowing through the switching transistor and the electric load. The voltage control circuit controls a potential difference across the current-measuring transistor so as to match a potential difference across the switching transistor, thereby achieving the proportion of the current flowing through the current-measuring transistor to the current flowing through the switching transistor and the electric load.

REFERENCES:
patent: 5081379 (1992-01-01), Korteling
patent: 5300837 (1994-04-01), Fischer
patent: 5473276 (1995-12-01), Throngnumchai
patent: 5519310 (1996-05-01), Bartlett

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