| 摘要 |
<p>A device for contactless transfer of data and energy is described which consists of a stationary part (ST) having an oscillator (OSC) for contactless transfer of power with the aid of a pair of coils (L1a, L2a; L1b, L2b) to a moving part (BT), in which arrangement the oscillation of the oscillator (OSC) is split into a reference oscillation and an information oscillation and a phase shift with respect to the reference oscillation is imposed on the information oscillation as a function of the data (DT1) to be transferred, this phase-shifted oscillation being supplied via a first pair of coils (L1b, L2b or L1b, L2a) and the reference oscillation being supplied via a second pair of coils (L1a, L2a or L1a, L2b) to the moving part (BT), the transferred oscillations being supplied in the moving part (BT) to a demodulator circuit (Demod) which recovers the data from the phase shift and a data transfer from the moving part (BT) to the stationary part (ST) being effected by means of changing the load, which transfer is characterised in that the power transfer occurs only with the aid of a pair of coils and that the data transfer from the moving part to the stationary part takes place only by changing the load on the coil of the moving part, which coil is not used for the power transfer or in that the data transfer from the moving part to the stationary part takes place by changing the load on only one pair of coils and in that the power transfer takes place only with the aid of the pair of coils which currently is not subjected to a change in the load due to the data transfer from the moving part to the stationary part. In addition, the use of such devices in data interchange systems and access systems is described, the moving part being constructed either as a key or as a chip card. <IMAGE></p> |
