Interface circuit with two input ports and allowing jointly to supply power to an application cicuit and to communicate with the latest

摘要

The present invention relates to an interface circuit (50) intended to be connected on the one hand to a bifilar bus (58, 60) and on the other hand to an application circuit (66). The interface circuit (50) comprises a full-wave rectifier bridge (D1, D2, D3, D4) serving to supply the application circuit (66) jointly with a power-supply capacitor (68). According to a preferred embodiment of the invention, the interface circuit furthermore comprises a first switch (70) and a second switch (72) serving to define a constantly specified voltage between a reference point (54) outside and a reference point (62) inside the application circuit. IMAGE