Cell overcharge protection circuit

H - Electricity – 02 – H

Patent

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Details

H02H 7/18 (2006.01) H01M 10/42 (2006.01) H02J 7/00 (2006.01) H01M 6/50 (2006.01)

Patent

CA 2200187

Overcharge protection circuit for rechargeable cells charged in series which have predetermined maximum permitted charging voltage and an open circuit voltage, comprising: diode means coupled across each of the cells to provide a shunt path if the voltage across the associated cell exceeds the maximum charging voltage; a charger circuit coupled to terminals of the series chain and applying a charging current of predetermined direction, wherein the diode means is a light emitting diode (LED) with a forward voltage substantially equal to the maximum permitted voltage and the charger circuit comprises current and/or voltage limiting means (R) limiting the current through the series chain of the cells at most to a value that corresponds substantially to the current that flows through the light emitting diode when the maximum permitted voltage being applied thereto, the light emitting diode (LED) is substantially non-conductive when a voltage corresponding to the open circuit voltage is applied in forward direction, whereby the light emitting diode constitutes no remarkable load for the associated cell when being stored or discharged, and fully shunts the cell after the cell has reached the fully charged state and providing simultaneously a visual indication that the associated cell has been charged.

Circuit de protection contre les surcharges pour des éléments rechargeables chargés en série et ayant une tension de charge avec maximum prédéterminé et une tension de circuit ouvert, comprenant: des diodes couplées sur chacun des éléments pour former un chemin de shuntage si la tension sur l'élément associé dépasse la tension de charge maximale; un circuit chargeur couplé aux bornes de la chaîne en série et appliquant un courant de charge dans un sens prédéterminé, la diode étant une diode électroluminescente (DEL) avec une tension directe sensiblement égale à la tension maximale autorisée, et le circuit chargeur comprend des moyens (R) de limitation du courant et/ou de la tension qui limitent le courant passant par la chaîne en série d'éléments de batterie au plus à une valeur qui correspond sensiblement à l'intensité de courant qui passe par la diode électroluminescente lorsque la tension maximale permise y est appliquée, la diode électroluminescente (DEL) étant sensiblement non conductrice lorsqu'une tension correspondant à la tension du circuit ouvert est appliquée dans un sens vers l'avant, la diode électroluminescente ne constituant pas de charge significative pour l'élément de batterie associé lorsqu'elle est stockée ou déchargée, et shuntant entièrement l'élément de batterie après que cet élément ait atteint un état de charge totale, avec indication visuelle que l'élément associé a été chargé.

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