Integrated current source feedback and current limiting element

Details Integrated current source feedback and current limiting element Integrated current source feedback and current limiting element

H - Electricity

02

H

H02H 9/02 (2006.01) G05F 1/569 (2006.01) G05F 1/66 (2006.01) H02H 9/00 (2006.01)

Patent

CA 2401592

A circuit (200) for supplying power to an intrinsically safe load having an integrated current source feedback and current limiting element. The circuit (200) includes a power supply (PS) and output terminals (T1-T2) that connect the circuits to the intrinsically safe load. Voltage limiting circuitry (Z1) between the power supply (PS) and the output terminals (T1-T2) limit is the voltage across the load. Current limiting circuitry (202) includes barrier resistors which convert current to voltage for comparison in an operational amplifier (OA) that adjust the impedance across a variable impedance device (Q1) and limits current applied to the load.

L'invention porte sur un circuit (200) destiné à alimenter en courant une charge à sécurité intrinsèque possédant un limiteur de courant à rétroaction intégré à une source de courant. Ce circuit (200) comprend une alimentation en courant (PS) et des bornes de sortie (T1-T2) connectant les circuits à la charge à sécurité intrinsèque. Un circuit limiteur de tension (Z1) placé entre l'alimentation en courant (PS) et les bornes de sortie (T1-T2) limite la tension dans la charge. Le circuit limiteur de tension (202) comprend des résistances barrière qui, sur la base d'une intensité, délivrent une tension destinée à être comparée dans un amplificateur opérationnel (OA), ce qui permet de finaliser l'impédance d'un circuit à impédance variable (Q1) et de limiter l'intensité appliquée à la charge.

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