Compact device for controlling a motor unit which displaces a screening element

A control device for controlling a motor which is operable in at least one rotational speed and two rotational directions and which motor is connected to a screening element, the device comprising;

• means for racelying control signals to operate the motor in said at least one rotational speed and in the two rotational directions, discrimination means for discriminating the control signals received, a motor control unit controlled by said discrimination means, a power supply with at least one electronic switch controlled by a control circuit so as to feed a regulated electrical output to said motor control unit, means for connecting the motor control unit to the motor, means for regulating the power supply, means for selecting a reference value of an electrical output to be supplied by the power supply to said motor control unit, said means for regulating the power supply including a detection circuit for detecting a difference appearing between the value of the regulated electrical output produced by said power supply and said reference value of an electrical output to be supplied by the power supply, said detection circuit being connected to control said control circuit of said at least one electronic switch so that the output of the power supply reaches a value equal to that of the reference value, and said selection means selecting the reference value of the electrical output as a function of the control signals received.