An information security module for distribution network

Abstract

The present invention discloses an information security module for a power distribution network, comprising a plastic housing (4) and a module circuit board (15) disposed within the plastic housing (4); four connection terminals (2) are disposed on the upper surface of the module circuit board (1), one end of the connection terminal (2) being welded to the module circuit board, and the other end penetrating the top plate of the plastic housing (4) and extending outside the plastic housing; at least one casting hole (13) is disposed on the bottom plate (7) of the plastic housing (4); an information security circuit is integrated on the module circuit board (10), the information security circuit comprising a first differential mode signal suppression unit, a common mode signal suppression unit, and a second differential mode signal suppression unit. The present invention uses components such as capacitors, yoke coils, and resistors to perform multiple filtering and multiple blocking on power carrier communication signals flowing through the loop without affecting normal power frequency current, thereby helping to ensure information security of the power distribution network.

Description

Technical Field

[0001] The present invention relates to information security of a low-voltage circuit system, and in particular to an information security module for a power distribution network. Background Art

[0002] Power lines are the most common and widespread physical medium today, and the power grid they form is a nearly natural physical network. If carrier communication signals are added to power lines, data transmission can be seamlessly achieved through these lines. Power line carrier communication is the only wired communication method that does not require line investment. It uses the power grid as a channel for data transmission and information exchange.

[0003] In an era when power line carrier communication is becoming increasingly mature, since the vast majority of data storage and processing equipment (such as computers, printers, copiers, fax machines, factory CNC machine tools, etc.) are inseparable from power lines, if the power line carrier communication channel is a hidden channel established unknown to people, then the information security of all data processed between these devices will be unprotected, which will inevitably bring huge security risks.

[0004] Users with high requirements for information security need to ensure information security not only on the Internet but also in the power system. Therefore, there is a significant social need for a power line information theft prevention device that effectively protects against potential technical theft and leaks using power line carrier communications as a covert communication channel. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an information security module for a distribution network. Through components such as capacitors, yoke coils, and resistors, the power carrier communication signal flowing through the loop is subjected to multiple filtering and multiple blocking without affecting the normal power frequency current, thereby helping to ensure the information security of the distribution network.

[0006] The object of the present invention is achieved through the following technical solutions: An information security module for a power distribution network comprises a plastic housing and a module circuit board disposed in the plastic housing;

[0007] Four connection terminals are provided on the upper surface of the module circuit board, one end of the connection terminal is welded to the module circuit board, and the other end passes through the top plate of the plastic shell and extends outside the plastic shell; at least one casting hole is provided on the bottom plate of the plastic shell.

[0008] Preferably, among the four wiring terminals, two of them serve as input ports of the information security module, used to connect the L line and N line of the power input line; the other two wiring terminals serve as output ports of the information security module, used to connect the L line and N line of the power output line.

[0009] Preferably, a guide groove is further provided on the lower surface of the bottom plate of the plastic housing, wherein a positioning clip is provided in the guide groove and slides within the guide groove. A positioning hole is provided on the bottom plate of the plastic housing, and the positioning clip has a positioning pin that cooperates with the positioning hole. The pin cooperates with the positioning hole to lock the positioning clip in the guide groove. The positioning clip is provided with a Z-shaped elastic strip, and the positioning pin is located on the Z-shaped elastic strip.

[0010] The module circuit board is integrated with an information security circuit, and the information security circuit includes a first differential mode signal suppression unit, a common mode signal suppression unit, and a second differential mode signal suppression unit;

[0011] The first differential mode signal suppression unit includes a yoke coil L1 and a yoke coil L2; the common mode signal suppression unit includes a common mode yoke coil L3, a common mode yoke coil L4, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2 and a resistor R3; the second differential mode suppression unit includes a yoke coil L5 and a yoke coil L6;

[0012] The first end of the yoke coil L1 is connected to the L line of the information security module input port, and the second end of the yoke coil L1 is connected to the first end of the common mode yoke coil L3; the first end of the yoke coil L2 is connected to the N line of the information security module input port, and the second end of the yoke coil L2 is connected to the second end of the common mode yoke coil L3;

[0013] The third end of the common-mode magnetic yoke coil L3 is connected to the first end of the common-mode magnetic yoke coil L4, and the fourth end of the common-mode magnetic yoke coil L3 is connected to the second end of the common-mode magnetic yoke coil L4. One end of the resistor R2 is connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the other end of the resistor R2 is grounded. One end of the resistor R3 is connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4, and the other end of the resistor R3 is grounded. The first ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the second ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4.

[0014] The third end of the common mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L5, the second end of the magnetic yoke coil L5 is connected to the L line of the output port of the information security module, the fourth end of the common mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L6, and the second end of the magnetic yoke coil L6 is connected to the N line of the output port of the information security module.

[0015] A capacitor C1 is connected between the first end of the yoke coil L1 and the first end of the yoke coil L2 , and a capacitor C2 is connected between the second end of the yoke coil L1 and the second end of the yoke coil L2 .

[0016] A capacitor C5 is connected between the first end of the yoke coil L5 and the first end of the yoke coil L6 , and a capacitor C6 is connected between the second end of the yoke coil L5 and the second end of the yoke coil L6 .

[0017] The common-mode magnetic yoke coil L3 consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L3, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L3. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L3, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L3.

[0018] The common-mode magnetic yoke coil L4 also consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L4, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L4. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L4, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L4.

[0019] The beneficial effects of the present invention are: the present invention uses components such as capacitors, yoke coils, resistors, etc. to perform multiple filtering and multiple blocking on the power carrier communication signal flowing through the loop without affecting the normal power frequency current, which helps to ensure the information security of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A top view of the present invention;

[0021] Figure 2 A bottom view of the present invention;

[0022] Figure 3 It is the AA cross-sectional view of the present invention;

[0023] Figure 4 This is a schematic diagram of the principle of the information security circuit;

[0024] Figure 5 Schematic diagram of the application principle of the present invention;

[0025] In the figure, 1-input end groove, 2-wiring terminal, 3-terminal cover, 4-plastic housing, 5-module mounting hole, 6-output end groove, 7-bottom plate, 8-guide groove, 9-positioning clip, 10-positioning hole, 11-positioning pin, 12-Z-type elastic strip, 13-pouring hole, 14-terminal cover notch, 15-module circuit board, 16-epoxy resin, 17-top plate, 18-screw hole boss, 19-bottom plate fixing strip, 20-screw, 21-positioning groove, 22-mounting rail. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0027] like Figures 1-3 As shown, an information security module for a power distribution network includes a plastic housing 4 and a module circuit board 15 disposed in the plastic housing 4;

[0028] The upper surface of the module circuit board 15 is provided with four terminals 2. One end of each terminal 2 is welded to the module circuit board, and the other end extends through the top plate of the plastic housing 4 and out of the plastic housing. The bottom plate 7 of the plastic housing 4 is provided with at least one casting hole 13. This casting hole 13 is used to inject liquid epoxy resin, allowing the liquid epoxy resin to fill the interior of the plastic housing 4. The cured epoxy resin 16 completely seals the module circuit board 15, the terminals 2, and other components, shielding them from the external environment.

[0029] In an embodiment of the present application, among the four wiring terminals 2, two of the wiring terminals serve as input ports of the information security module, used to connect the L line and N line of the power input line; the other two wiring terminals serve as output ports of the information security module, used to connect the L line and N line of the power output line.

[0030] In the embodiment of the present application, a guide groove 8 is further provided on the lower surface of the bottom plate 7 of the plastic housing 4. A positioning clip 9 is provided in the guide groove 8 and slides in the guide groove 8. A positioning hole 10 is provided on the bottom plate 7 of the plastic housing 4. The positioning clip 9 has a positioning pin 11 that cooperates with the positioning hole 10. The pin 11 cooperates with the positioning hole 10 to lock the position of the positioning clip 9 in the guide groove 8. A Z-shaped elastic strip 12 is provided on the positioning clip 9. The positioning pin 11 is located on the Z-shaped elastic strip 12. The elastic force of the Z-shaped elastic strip 12 maintains the clamping force of the positioning clip 9 on the mounting guide rail 22.

[0031] In the embodiment of the present application, the inner wall of the top plate 17 of the plastic housing is designed with four screw hole bosses 18, and the module circuit board 15 is fixed to the screw hole bosses 18 by screws 20, so that the module circuit board 15 is tightly connected to the housing; a groove structure that cooperates with the terminal is provided on the top plate of the housing, namely the input end groove 1 and the output end groove 6, and a terminal cover groove 14 is provided on the side wall of the input end groove 1 and the output end groove 6, and the terminal cover 3 is inserted into the terminal cover groove 14 so that the terminal cover 3 can shield the terminal 2 to prevent the operator from accidentally touching the live terminal 2; the top plate 17 of the plastic housing and the bottom plate 7 of the housing are determined by the positioning groove 21 to ensure that the two are accurately aligned; a bottom plate fixing strip 19 is provided on the bottom plate 7 of the housing, and the bottom plate fixing strip 19 is coated after the epoxy resin 16 is cured, so that the top plate 17 of the housing and the bottom plate 7 of the housing are tightly connected together;

[0032] In some embodiments of the present application, a module mounting hole 5 is further provided on the bottom plate 7 of the housing, and the information security module of the present application can be fixed to the mounting plate through the module mounting hole 5; in other embodiments of the present application, the information security module can also be installed through the mounting guide rail 22, and the bottom plate 7 of the housing is provided with a guide groove 8, and the positioning clip 9 can slide in the guide groove 8. A positioning hole 10 is provided in the bottom plate 7 of the housing, and a positioning pin 11 is provided on the positioning clip 9. The positioning pin 11 forms a fitting relationship with the positioning hole 10, thereby locking the position of the positioning clip 9 in the guide groove 8. In this position, the positioning clip 9 can clamp the mounting guide rail 22. The positioning clip 9 is provided with a Z-shaped elastic strip 12, and the positioning pin 11 is located on the Z-shaped elastic strip 12, so that the positioning clip 9 maintains a clamping force on the mounting guide rail 22 in the locked position.

[0033] like Figure 4 As shown, the module circuit board 10 is integrated with an information security circuit, and the information security circuit includes a first differential mode signal suppression unit, a common mode signal suppression unit, and a second differential mode signal suppression unit;

[0034] The first differential mode signal suppression unit includes a yoke coil L1 and a yoke coil L2; the common mode signal suppression unit includes a common mode yoke coil L3, a common mode yoke coil L4, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2 and a resistor R3; the second differential mode suppression unit includes a yoke coil L5 and a yoke coil L6;

[0035] The first end of the yoke coil L1 is connected to the L line of the information security module input port, and the second end of the yoke coil L1 is connected to the first end of the common mode yoke coil L3; the first end of the yoke coil L2 is connected to the N line of the information security module input port, and the second end of the yoke coil L2 is connected to the second end of the common mode yoke coil L3;

[0036] The third end of the common-mode magnetic yoke coil L3 is connected to the first end of the common-mode magnetic yoke coil L4, and the fourth end of the common-mode magnetic yoke coil L3 is connected to the second end of the common-mode magnetic yoke coil L4. One end of the resistor R2 is connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the other end of the resistor R2 is grounded. One end of the resistor R3 is connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4, and the other end of the resistor R3 is grounded. The first ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the second ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4.

[0037] The third end of the common mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L5, the second end of the magnetic yoke coil L5 is connected to the L line of the output port of the information security module, the fourth end of the common mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L6, and the second end of the magnetic yoke coil L6 is connected to the N line of the output port of the information security module.

[0038] A capacitor C1 is connected between the first end of the yoke coil L1 and the first end of the yoke coil L2 , and a capacitor C2 is connected between the second end of the yoke coil L1 and the second end of the yoke coil L2 .

[0039] A capacitor C5 is connected between the first end of the yoke coil L5 and the first end of the yoke coil L6 , and a capacitor C6 is connected between the second end of the yoke coil L5 and the second end of the yoke coil L6 .

[0040] The common-mode magnetic yoke coil L3 consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L3, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L3. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L3, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L3.

[0041] The common-mode magnetic yoke coil L4 also consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L4, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L4. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L4, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L4.

[0042] like Figure 5As shown, this is the application wiring diagram of the information security module of the present application connected in series in an AC220V power system. The input power equipment is connected to the information security module through the power input line, and the information security module is then connected to the load power equipment through the power output line. The input-end carrier communication module is connected to the input-end power equipment, and the output-end carrier communication module is connected to the load-end power equipment. When the input-end carrier communication module inputs a power carrier communication signal to the power system, the carrier communication signal passes through the information security module along with the system operating current. Due to the filtering and blocking effect of the information security module, the power carrier communication signal cannot reach the load-end carrier communication module, thereby preventing the input-end carrier communication module from transmitting information to the load-end carrier communication module.

[0043] The input terminal of the present invention can receive AC220V current. Connected to the input terminal are components such as capacitors, magnetic yoke coils, and resistors. These components form a functional circuit that performs multiple filtering and blocking operations on power carrier communication signals flowing through the loop, preventing them from being transmitted to the output terminal. However, this circuit does not block the normal power frequency current of the AC220V power system.

[0044] When a power carrier communication signal enters the circuit from the input, capacitors C1 and C2 are connected in parallel between the L and N lines, providing frequency division and filtering for the high-frequency carrier signal. Capacitor C1's parameters are specifically designed for filtering power carrier communication signals in the 1kHz-100kHz range, while capacitor C2's parameters are specifically designed for filtering signals in the 100kHz-1MHz range. The yoke coils L1 and L2 on the L line and the N line suppress differential-mode signals. The parameters of the yoke coils L1 and L2 are designed to suppress power carrier communication signals in the 1kHz-1MHz range.

[0045] The rear end of capacitor C2 is connected to the common-mode yoke coil L3, which consists of two sets of coils and a toroidal magnetic core. One set of coils is connected to the L line, and the other set of coils is connected to the N line. The two sets of coils are wound on the same magnetic core, with the same number of turns and winding direction. The rear ends of the two sets of coils are connected to the ground point through resistors R2 and R3, respectively. The parameters of resistors R2 and R3 are consistent. The common-mode yoke coil L3, resistors R2, and resistor R3 form a common-mode signal suppression circuit. Selecting the relevant component parameters can significantly isolate the 1MHz-85MHz power carrier communication signal through common-mode suppression. Capacitor C3 filters out stray carrier communication signals, and resistor R1 balances the potential. Together with resistors R2 and R3, it forms a shunt ground for the carrier communication signal.

[0046] The loop composed of the yoke coil L5, the yoke coil L6, the capacitor C5, the capacitor C6, the common-mode yoke coil L4, and the capacitor C4 has a symmetrical structure compared to the above loop. Its main function is to block the power carrier communication signal entering the output end.

[0047] Of course, without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An information security module for a power distribution network, characterized by: It comprises a plastic housing (4) and a module circuit board (15) arranged in the plastic housing (4); The upper surface of the module circuit board (15) is provided with four connection terminals (2), one end of the connection terminal (2) is welded to the module circuit board, and the other end passes through the top plate of the plastic shell (4) and extends outside the plastic shell; at least one casting hole (13) is provided on the bottom plate (7) of the plastic shell (4); An information security circuit is integrated on the module circuit board (15), and the information security circuit comprises a first differential mode signal suppression unit, a common mode signal suppression unit, and a second differential mode signal suppression unit; The first differential mode signal suppression unit includes a yoke coil L1 and a yoke coil L2; the common mode signal suppression unit includes a common mode yoke coil L3, a common mode yoke coil L4, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2 and a resistor R3; the second differential mode signal suppression unit includes a yoke coil L5 and a yoke coil L6; The first end of the yoke coil L1 is connected to the L line of the information security module input port, and the second end of the yoke coil L1 is connected to the first end of the common mode yoke coil L3; the first end of the yoke coil L2 is connected to the N line of the information security module input port, and the second end of the yoke coil L2 is connected to the second end of the common mode yoke coil L3; The third end of the common-mode magnetic yoke coil L3 is connected to the first end of the common-mode magnetic yoke coil L4, and the fourth end of the common-mode magnetic yoke coil L3 is connected to the second end of the common-mode magnetic yoke coil L4. One end of the resistor R2 is connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the other end of the resistor R2 is grounded. One end of the resistor R3 is connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4, and the other end of the resistor R3 is grounded. The first ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the third end of the common-mode magnetic yoke coil L3 and the first end of the common-mode magnetic yoke coil L4, and the second ends of the resistor R1, capacitor C3, and capacitor C4 are all connected between the fourth end of the common-mode magnetic yoke coil L3 and the second end of the common-mode magnetic yoke coil L4. The third end of the common-mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L5, the second end of the magnetic yoke coil L5 is connected to the L line of the output port of the information security module, the fourth end of the common-mode magnetic yoke coil L4 is connected to the first end of the magnetic yoke coil L6, and the second end of the magnetic yoke coil L6 is connected to the N line of the output port of the information security module; A capacitor C1 is connected between the first end of the yoke coil L1 and the first end of the yoke coil L2, and a capacitor C2 is connected between the second end of the yoke coil L1 and the second end of the yoke coil L2; A capacitor C5 is connected between the first end of the yoke coil L5 and the first end of the yoke coil L6 , and a capacitor C6 is connected between the second end of the yoke coil L5 and the second end of the yoke coil L6 .

2. The information security module for a power distribution network according to claim 1, characterized in that: Among the four wiring terminals (2), two of them serve as input ports of the information security module and are used to connect the L line and the N line of the power input line; and the other two wiring terminals serve as output ports of the information security module and are used to connect the L line and the N line of the power output line.

3. The information security module for a power distribution network according to claim 1, characterized in that: A guide groove (8) is further provided on the lower surface of the bottom plate (7) of the plastic housing (4), and a positioning clip (9) sliding in the guide groove (8) is provided in the guide groove (8). A positioning hole (10) is provided on the bottom plate (7) of the plastic housing (4), and the positioning clip (9) has a positioning pin (11) matched with the positioning hole (10). The positioning pin (11) cooperates with the positioning hole (10) to lock the position of the positioning clip (9) in the guide groove (8).

4. The information security module for a power distribution network according to claim 3, characterized in that: A Z-shaped elastic strip (12) is provided on the positioning clip (9), and the positioning pin (11) is located on the Z-shaped elastic strip (12).

5. The information security module for a power distribution network according to claim 1, characterized in that: The common-mode magnetic yoke coil L3 consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L3, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L3. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L3, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L3.

6. The information security module for a power distribution network according to claim 1, characterized in that: The common-mode magnetic yoke coil L4 consists of two groups of coils and a toroidal magnetic core. The two groups of coils are wound on the same toroidal magnetic core with the same number of turns and winding direction. One end of the first group of coils serves as the first end of the common-mode magnetic yoke coil L4, and the other end of the first group of coils serves as the third end of the common-mode magnetic yoke coil L4. One end of the second group of coils serves as the second end of the common-mode magnetic yoke coil L4, and the other end of the second group of coils serves as the fourth end of the common-mode magnetic yoke coil L4.

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