FET current sensor for active balancing or regulating circuits

Details FET current sensor for active balancing or regulating circuits FET current sensor for active balancing or regulating circuits

1995-08-31

1997-01-07

Voeltz, Emanuel T.

Boots, shoes, and leggings

364482, 364483, 307 31, 307 32, H02J 100

Patent

active

055923941

ABSTRACT:
A method and apparatus for balancing shared power supplies or regulating a power supply device includes disposing a transistor (310) in series with a power supply current that is supplied to a load resistor (316) The gate of the transistor (310) is controlled by a control circuit (320) to set the gate-to-source voltage thereon to define a desired current therethrough. The voltage across the transistor (310) is measured with a voltage detector (322) and then a current conversion device (324) is operable to use a look up table to determine from the gate voltage on the transistor (310) what the impedance across the drain-to-source is and then calculate the current. This current is then utilized by the control circuit (320) to control the current through transistor 310. This therefore allows transistor (310) to both provide the control operation and provide the sensing operation, thus eliminating the requirement for a separate sense resistor.

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