Abstract: A braking device for a moveable door leaf includes an electrical brake motor operated as a generator. The motor shaft of which is rotatable by a movement of the door leaf and which can be controlled for regulating the closing speed of the door leaf by an electronic evaluation and control unit, which is at least partially provided with electrical energy by an electric motor operated as a generator and/or by an additional generator unit. The electronic evaluation and control unit is operable in a sleep mode and is cyclically displaceable into a waking state depending on the closing speed of the door leaf. A door closer with a mechanical energy storage and a braking device is also disclosed.

Abstract: A braking device for a moveable door leaf comprises an electrical brake motor being operated as a generator, the motor shaft of which is rotatable by a movement of the door leaf and which can be controlled for regulating the closing speed of the door leaf by means of an electronic evaluation and control unit, which is at least partially providable with electrical energy by an electric motor being operated as a generator, particularly the brake motor, and/or by means of an additional generator unit. The electronic evaluation and control unit is thus operable in a sleep mode and is cyclically displaceable into a waking state depending on the closing speed of the door leaf, wherein the wake-up frequency with which the electronic evaluation and control unit is cyclically awakened during a respective closing movement of the door leaf is less at relatively lower closing speeds of the door leaf than at relatively greater closing speeds of the door leaf.