Patent ID: 8248005
Filing Date: 2012-08-21
Classification: E05Y,H02P

Abstract:
1. A braking circuit for a door actuator, configured to influence a movement of a connected door in at least one direction of movement, having at least one electrical motor, the braking circuit comprising: a bipolar transistor configured to be supplied when the electrical motor is generatively operated in a first direction of operation opposite to the one direction of movement with the generatively produced energy as a load resistance; a voltage regulator configured to control a voltage applied to a base terminal of the bipolar transistor the applied voltage based at least in part on a generator voltage produced in the electrical motor providing an associated control voltage based at least in part on a reference voltage, comprising: a first power supply connector coupled to a collector terminal of the bipolar transistor and to the voltage input of the voltage regulator; a second power supply connector coupled to an emitter terminal of the bipolar transistor; and a first resistive branch comprising at least one electrical resistor, coupled to the reference input of the voltage regulator.