Power supply with thermistor precharge and protection circuit

Details Power supply with thermistor precharge and protection circuit Power supply with thermistor precharge and protection circuit

B - Operations, Transporting

23

K

B23K 9/10 (2006.01) B23K 10/00 (2006.01)

Patent

CA 2241145

A power supply with an input protection circuit is disclosed. The protection circuit includes a thermistor that heats up if the power supply is mistakenly connected to an excessive input voltage. When the thermistor gets hot, its resistance increases, and isolates the down stream portion of the power supply from the input voltage. A relay in parallel with the thermistor is closed, thus shorting the thermistor, after a preset time if the input voltage had a proper magnitude.

Alimentation électrique avec circuit de protection d'entrée. Ce circuit de protection comprend une thermistance dont la chaleur augmente lorsqu'on relie par erreur l'alimentation électrique à une tension d'entrée trop élevée. La thermistance, en se réchauffant, augmente sa résistance, ce qui isole de la tension d'entrée la section de l'alimentation électrique située en aval et entraîne la fermeture d'un relais parallèle à la thermistance qui court-circuite celle-ci après une durée prédéterminée si la tension d'entrée possédait une valeur appropriée.

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