Dual voltage voltage regulator with foldback current limiting

Details Dual voltage voltage regulator with foldback current limiting Dual voltage voltage regulator with foldback current limiting

H - Electricity

02

M

H02M 3/142 (2006.01) G05F 1/573 (2006.01)

Patent

CA 2189852

A voltage regulator is switchable between a lower regulated DC output voltage and a higher regulated DC output voltage. Foldback current limiting is actuated in response to the current drawn by the load when a current limiting threshold is exceeded. The current limiting threshold is determined by the voltage relationship at respective taps of a pair of voltage dividers, with said relationship being effected by the voltage appearing across a current sensing resistor coupled in series with the load. The current limiting threshold is adjusted to be approximately the same for both the lower and the higher regulated DC output voltages. This adjustment is accomplished with a non-linear voltage dependent device, which is coupled to one of the voltage dividers, and is actuated in the higher output voltage mode.

Un régulateur de tension peut être commuté entre une tension continue de sortie, régulée, inférieure, et une tension continue de sortie, régulée, supérieure. Une limitation de courant de type "foldabck" est déclenchée en réponse au courant tiré par la charge lorsqu'un seuil de limitation de courant est dépassé. Le seuil de limitation de courant est déterminé par la relation de tension au niveau des prises respectives d'une paire de diviseurs de tension, cette relation étant effectuée par la tension apparaissant dans une résistance de détection de tension couplée en série avec la charge. Le seuil de limitation de courant est ajusté de façon à être approximativement identique aux tensions continues de sortie, régulées, inférieure et supérieure. Ce réglage s'effectue à l'aide d'un dispositif dépendant de la tension non linéaire, qui est couplé à l'un des diviseurs de tension, et est actionné dans le mode de tension de sortie inférieure.

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