Arrangement for generating an operating voltage for an electrical assembly of a vehicle

The operating voltage generation device uses a piezoelectric element (3) oscillated by the variations in the tyre pressure of a vehicle wheel upon movement of the vehicle, for providing a corresponding output voltage used for supplying an electrical component group (5). The piezoelement can be incorporated in a tyre valve (2), its output signal supplied to the electrical component group via an electronic voltage rectification and regulation stage (4).