Linear load current measurement circuit

Details Linear load current measurement circuit Linear load current measurement circuit

1987-12-04

1989-05-02

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, G05F 316

Patent

active

048272078

ABSTRACT:
A circuit for the linear measurement of a current flowing through a load which comprises a current sensor consisting of a resistor, and a first driver transistor connected to the load and a second transistor connected to the resistor, both transistors being field effect transistors interconnected into a current mirror configuration, which includes an operational amplifier having its inputs respectively connected to the drain electrodes of the first and second transistors to regulate the drain-source voltage of the transistors and enable linear measurement of the load current irrespective of the operating temperature.

REFERENCES:
patent: 4251743 (1981-02-01), Harayama
patent: 4319181 (1982-03-01), Wrathall
patent: 4553084 (1985-11-01), Wrathall
patent: 4599554 (1986-07-01), Jaycox et al.
Fay; "Current-Mirror FETs Cut Costs and Sensing Losses"; EDN; Sep. 4, 1986.

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