Device for extracting a supply signal from a bus signal, and bus apparatus

摘要

Device for extracting a supply signal from a bus signal, wherein the device has an impedance between the first and second input thereof, and comprises a conversion circuit adapted and connected to the first and second inputs such that a current is extracted from the bus for the purpose of providing a voltage signal to a linear or switching power supply; and a compensation circuit adapted to change the impedance when the current extracted from the bus falls below a determined threshold.