AN ELECTRONIC INDUCTANCE CIRCUIT FOR THE POWER SUPPLY OF A 2-WIRE BUS INTERCOM SYSTEM AND A DEVICE THEREOF

摘要

An electronic inductance circuit for the power supply of a 2-wire bus intercom system and a device thereof. The electronic inductance circuit comprises a main circuit path along an inductor (LI) and the source terminal (S) and the drain terminal (D) of a FET (Ql) between the input terminal (Al) and the output terminal (AO) of said electronic inductance circuit, in which said inductor is connected to said source terminal of said FET; a resistor (Rl) and a freewheeling diode (Dl) individually connected to said inductor in parallel; and a secondary circuit path along a capacitor (CI) connected with a second resistor (R2) in series between said input terminal and said output terminal, which is connected to said main circuit path in parallel. The solutions of the electronic inductance circuit achieve larger direct current power supply for the 2-wire intercom system and stable alternating current impedance with fast response to the DC power supply.