Information blocking circuit for power system

Abstract

The invention discloses an information blocking circuit for a power system. The information blocking circuit comprises an input port, an output port, a switch K1, a switch K2, a first differential mode signal suppression unit, a common mode signal suppression unit and a second differential mode signal suppression unit, wherein the first differential mode signal suppression unit comprises a magnet yoke coil L1 and a magnet yoke coil L2; the common-mode signal suppression unit comprises a common-mode magnet yoke coil L3, a common-mode magnet yoke coil L4, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2 and a resistor R3; and the second differential mode suppression unit comprises a magnet yoke coil L5 and a magnet yoke coil L6. According to the invention, the current of the L line and the N line can be disconnected and connected through the K1 switch and the K2 switch respectively, overload current and short-circuit current flowing through the L line and the N line are disconnected and protected, and loop safety is guaranteed.

Description

technical field [0001] The invention relates to an information blocking circuit of a low-voltage power system, in particular to an information blocking circuit used in a power system. Background technique [0002] The power line is the most common physical medium with the widest coverage today, and the power network formed by it is a nearly natural physical network. If the carrier communication signal is loaded on the power line, the power line can be used to smoothly realize the communication data transmission. Power carrier communication is the only wired communication method that does not require line investment. It uses the power network as a channel to realize data transmission and information exchange. [0003] In the era when power line carrier communication is becoming more and more mature, most data storage and processing equipment (such as computers, printers, copiers, fax machines, CNC machine tools in factories, etc.) cannot be separated from power lines. If pe...

AI Technical Summary

Problems solved by technology

[0003] In the era when power line carrier communication is becoming more and more mature, most data storage and processing equipment (such as computers, printers, copiers, fax machines, CNC machine tools in factories, etc.) cannot be separated from power lines. If people know about a covert channel, the information security of all data processed between these devices will not be kept secret, which will definitely bring great security risks.

Images