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DECHARGEUR d'accumulateurs de réception

Par zeppelin - 6/02/2009 - 19:59

Un accu de réception caustaud...OK! et même indispensable dans certaines circonstances. Mais le jour où le temps de navigation est court parce que le temps est mauvais ou parce que le créneau disponible est serré, on se trouve avec un accu partiellement vidé: un problème se pose...si comme moi vous n'avez pas investi dans un chargeur déchargeur intelligent, vous devez décharger votre accu avant de le regonfler!

Pour le recharge, pas de soucis: vous connaissez la capacité le l'accu en mAh et l'intensité débitée par votre chargeur en mA, une simple division vous permet de définir le temps de charge, si...si votre accu est déchargé!

Un accu déchargé, c'est quoi? c'est un accu dont la tension a chuté par rapport à sa tension nominale soit 0,95 V pour un élément de 1,2 V.

Première solution: faire débiter votre accu dans un consommateur de courant (ampoules, moteur électrique) en prenant soin de ne pas pratiquer une décharge trop rapide ( quelques heures ) et brancher en parallèle un voltmètre pour surveiller la tension. La procédure devra cesser lorsque la tension sera de 0,95 X 4 soit 3,8 Volts.

 Seconde solution: se bricoler un déchargeur à 3 sous ( sinon on achète un truc tout fait et tout cher!)

 

schéma déchargeur accu

 

La lampe sert de consommateur de courant, son remplacement par une lampe plus ou moins puissante permet d'adapter le courant de décharge à l'accu. Les deux leds en parallèle avertissent de la fin de décharge (extinction). La résistance réglable permet de définir le seuil de tension maxi de décharge. Le voltmètre permet de suivre la décharge mais n'est pas indispensable lorsque le boîtier est réglé.

déchargeur 1

 Entre temps, un petit voltmètre est ajouté sur le dessus de la boîte et étaloné à l'aide d'une résistance variable ce qui permet de ne plus utiliser un voltmètre en parallèle et de surveiller le fonctionnement du déchargeur.

déchargeur 2

 


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