H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 7/06 (2006.01) F21L 4/08 (2006.01) H02J 9/00 (2006.01)
Patent
CA 2669713
The present invention relates to emergency lighting ballasts having rechargeable batteries, usually of the nickel-cadmium type and more specifically to an apparatus to facilitate the charging of the battery pack at temperatures generally below normal operating ranges of the batteries (such as below 0° C) without damaging the battery. The apparatus includes such as a reverse-biased zener diode which has a breakdown voltage in the reverse mode which is at or below the maximum allowable charging voltage for the battery. Accordingly, when ambient conditions would otherwise allow the charging current of the battery to exceed the allowable level, the clamping zener diode breaks down shunting the excess current away from the battery.
L'invention porte sur des éclairages d'urgence à batteries rechargeables normalement du type nickel-cadmium et plus spécifiquement sur un appareil permettant le chargement de groupes de batteries à des températures normalement inférieures aux plages normales d'exploitation des batteries (telles qu'inférieures à 0 ° C), sans endommager les batteries. L'appareil comporte un dispositif tel qu'une diode de Zener dont la tension de claquage en mode inverse est égale ou inférieure à la tension maximale autorisée de charge de la batterie. Ainsi, lorsque les conditions ambiantes pourraient permettre de dépasser le maximum autorisé, la diode de Zener de protection claque et dérive le courant en excès hors de la batterie.
Crenshaw David B.
Koninklijke Philips Electronics N.v.
Smart & Biggar
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