Abstract: A device and a method for power management of a control apparatus, which control apparatus comprises: a main power source (10), a backup power source (11) and a functional circuit (12). The functional circuit outputs detection information. The power management device comprises a selection circuit (20) suitable for choosing the main power source or the backup power source to supply power to the functional circuit; and a control circuit (21), suitable for switching off the power supply pathway from the backup power source to the functional circuit when the selection circuit chooses the backup power source for supplying power but has not received a trigger signal, and for switching on the power supply pathway from the backup power source to the functional circuit when the selection circuit chooses the backup power source for supplying power and has received a trigger signal.

Abstract: A vacuum device for attaching an object to a surface, comprising a body fixable to the object and a piston connected to the body along a first sealing contour, thereby defining with the body a first chamber. The piston has a protruding sealing lip adapted to contact the surface along a second sealing contour, thereby defining with the surface a second chamber. The two chambers are connected to a source of vacuum, and are preferably in fluid communication with each other. The piston is movable with respect to the body by the action of the vacuum in the first chamber and/or by an external force due to the contact of the sealing lip with the surface. The sealing lip is urged to the surface by a first sealing force due to the action of the vacuum in the second chamber. The vacuum device further comprises a spring connected to the piston and the body so as to deform when the piston moves with respect to the body.