Current monitoring

B - Operations – Transporting – 61 – L

Patent

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Details

346/104, 324/58

B61L 5/18 (2006.01) B61L 7/10 (2006.01) G01R 31/02 (2006.01) H05B 37/03 (2006.01)

Patent

CA 2004563

A circuit arrangement includes a lamp filament (1) as a load and a resistor (2) in series with the filament. For detecting the current through the load, the source of a MOSFET (6) is connected with the end of the resistor remote from the filament, the drain of the MOSFET being connected with the other end of the resistor via the primary winding of a step-up transformer (7) and a further resistor (8), a diode (9) being connected between the source and the drain of the MOSFET. If the MOSFET is turned on by an appropriate voltage at an input (11) connected to its gate, the voltage across the secondary winding of the transformer is substantially proportional to the value of the current through the filament.

Le circuit comprend un filament de lampe (1) comme charge et une résistance (2) en série avec le filament. Pour détecter le courant à travers la charge, la source d'un MOSFET (6) est connectée à l'extrémité de la résistance éloignée du filament, le drain du MOSFET étant connecté à l'autre extrémité de la résistance par l'intermédiaire de l'enroulement primaire d'un transformateur élévateur (7) et une autre résistance (8), une diode (9) étant connectée entre la source et le drain du MOSFET. Si le MOSFET est mis sous tension par une tension appropriée à une entrée (11) connectée à sa grille, la tension à travers l'enroulement secondaire du transformateur est substantiellement proportionnelle à la valeur du courant traversant le filament.

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