Multi-rate charger with auto reset

Abstract

A multi-rate charging circuit includes charging electronics adapted to condition power received from a power source according to operational settings for one or more charge parameters. A plurality of user-selectable charge sets each include settings for one or more of the charge parameters and one of the charge sets is designated as the current default charge set. The charging electronics assume the settings of the default charge set upon power-up, thereafter the user may select an alternative charge set if so desired. A trigger monitor, such as a current level sensor, monitors for the occurrence of a trigger event, such as low current flow associated with the removal of a battery pack, and generates a reset signal in response thereto. The reset signal causes the charging electronics to automatically assume the settings represented by the current default charge set for its operational settings. Thus, upon the occurrence of a triggering event, the charging electronics reverts to (or continues, as appropriate) the default charge set settings. Accordingly, the charging circuit automatically charges each battery pack according to the default settings unless the governing charge set is changed by the user after that battery pack is connected to the charging electronics.