Circuit for preventing deep discharge of battery in motor vehicle on-board electrical system has charge state detector automatically decoupled from battery after opening isolating element

摘要

The circuit has an isolating element (8) between the battery (1) and ignition-independent loads (4) and at least one battery charge state detector that determines the state of charge with the ignition off and switches the isolating element depending on the state of charge. The detector is designed so that it is automatically decoupled from the battery after opening the isolating element.