| 摘要 |
<p>A circuit arrangement for operating an inductively operating rail contact is specified, which contact contains an AC-fed transmitting coil and a receiving coil which is coupled magnetically thereto. A vehicle wheel which is located in the area of action of the rail contact influences the magnetic flux which penetrates the receiving coil and thus influences the voltage induced in the receiving coil. The circuit arrangement according to the invention contains a phase-locked loop (PLL) for feeding the transmitting coil (transmitting coil circuit SK). The output voltage of the phase-locked loop is additionally frequency-modulated. The evaluation of the voltage induced in the receiving coil (receiving coil circuit EK) takes place by means of an in-phase rectifier whose reference voltage is drawn from the transmission-side phase-locked loop. <IMAGE></p> |
