Abstract: A transceiver/transponder system has a transceiver (1) with a transceiver oscillating circuit (2, 3), at least one transponder (10) with a transponder oscillating circuit (11, 12), and an energy accumulator (13). The transceiver (1) and the transceiver oscillating circuit (2, 3) are designed in such a manner that the transceiver oscillating circuit (2, 3) is caused to oscillate with a predetermined frequency for at least one charging duration (T_L). The transponder (10), the transponder oscillating circuit (11, 12) and the energy accumulator (13) are designed in such a manner that the energy accumulator (13) is charged while the transponder oscillating circuit (11, 12) is caused to oscillate by the transceiver oscillating circuit (2, 3). The transponder (10) additionally has a time measuring device (15), which is configured for determining a duration value that is characteristic of a charged state of the energy accumulator (13).

Abstract: Devices and methods are used for ascertaining wheel positions of wheels on a wheeled vehicle. Separate wheel units are connected to each other via a vehicle bus and via an additional supply lead, so that for the purposes of learning the separate wheel units, the separate wheel units are connected to the supply lead successively in a predetermined sequence and provided with a new, individual identity code, or subjected to a wheel-unit-specific dc voltage potential as an identity code by using at least one additional connection.

Abstract: Devices and methods are used for ascertaining wheel positions of wheels on a wheeled vehicle. Separate wheel units are connected to each other via a vehicle bus and via an additional supply lead, so that for the purposes of learning the separate wheel units, the separate wheel units are connected to the supply lead successively in a predetermined sequence and provided with a new, individual identity code, or subjected to a wheel-unit-specific dc voltage potential as an identity code by using at least one additional connection.

Abstract: A voltage transformer includes a voltage input and a voltage output. A capacitor is disposed on the output side for providing an output voltage. A controllable switching element controls a current flowing through a coil. A control unit is connected on the output side to the switching element, for controlling switching times of the switching element. The control unit controls the switching times as a function of the input and output voltages. An associated operating method is also provided.