CN1556590A - Channel optimization device for power line high-speed data communication system - Google Patents

Abstract

The invention relates to a channel optimization device for a power line high-speed data communication system, which is connected in series between user electrical equipment and a power line power supply, and includes a device for simultaneously filtering the phase line and the ground line. The channel optimization device specifically includes a low-pass network part (3) and a filter circuit part (4), wherein the low-pass network part is connected to the power line power supply for suppressing high-frequency series mode noise, and the filter circuit part is connected with the user Electrical equipment connection, used to suppress common mode interference noise. Therefore, the anti-noise and anti-interference ability of the power line high-speed data communication system is improved.

Description

Channel optimization device for power line high-speed data communication system

technical field

The invention relates to an electronic and electrical device, in particular to a channel optimization device for a power line high-speed data communication system.

Background technique

The use of power lines for voice and data transmission has a history of several decades, but they are all low-speed voice and data communications in the low-to-medium frequency range. With the development of information technology and the advent of the information age, people's demand for high-speed data services is also increasing. Among the many alternative data access methods, using the existing distribution power line as a carrier to transmit high-speed data undoubtedly has obvious advantages.

In recent years, great progress has been made in the research of power line high-speed data communication technology and its application at home and abroad, and several power line high-speed data communication systems and their terminal products have been tested at home and abroad.

However, the power line of the distribution network is designed for the transmission of power frequency current. There are many problems in the transmission of high-frequency carrier signals on the power line. Among them, the noise and interference of the power line are a major problem affecting the high-speed data communication performance of the power line. The main source of noise and interference in power lines lies in various electrical appliances, especially some irregular and inferior products. This problem is particularly prominent in our country. Therefore, how to reduce the noise and interference of the power line, improve the high-frequency impedance of the line, and optimize the high-frequency channel are very important to improve the performance of the power line high-speed data communication system.

In order to solve the anti-noise and interference ability of power line high-speed data communication system, domestic and foreign research mainly adopts advanced communication technology, such as modulation and demodulation technology, coding error correction technology and networking technology, etc., but these methods lead to increased equipment costs and complex system networks , which is not conducive to practical application.

Contents of the invention

The technical problem to be solved by the present invention is to provide a channel optimization device for a power line high-speed data communication system, which can improve the anti-noise and anti-interference capabilities of the power line high-speed data communication system.

According to the present invention, there is provided a channel optimization device for a power line high-speed data communication system, which is connected in series between user electrical equipment and a power line power supply, and includes a device for simultaneously filtering the phase line and the ground line.

Preferably, the channel optimization device includes a low-pass network part and a filter circuit part, wherein the low-pass network part is connected to a power line power supply for suppressing high-frequency series mode noise, and the filter circuit part is connected to user electrical equipment, Used to suppress common mode interference noise.

The channel optimization device is installed between the electrical equipment and the power line power supply. By converting the low resistance and low capacitance characteristics of some electrical equipment to the power line, it basically matches the high frequency characteristic impedance of the power line, thereby reducing the Reflection loss and capacitive absorption loss improve data transmission distance and transmission reliability. Moreover, the channel optimization device of the present invention blocks the high-frequency interference generated by electrical equipment on the side of the electrical equipment so that it does not cause high-frequency pollution to the power grid, which also improves the signal-to-noise ratio, reduces the bit error rate, and realizes Reliable and stable high-speed data communication.

The channel optimization device for the power line high-speed data communication system of the present invention not only has excellent noise suppression capability, but also has an optimization function for the power line high-frequency carrier channel, which is manifested in the following points:

1. Noise suppression capability in wide frequency range. The inventive device can effectively suppress interference noise in a wide frequency range from 150KHz to 38MHz. Compared with widely used high-voltage power line single-frequency or dual-frequency narrow-band wave traps, the inventive device has a much wider frequency band. Moreover, the inventive The suppression performance of the device is much higher, for example, in the f≥2MHz frequency band, the noise suppression is ≥40dB.

2. Good impedance setting in wide frequency range. The inventive device is designed for low impedance input and high impedance output. In this way, due to the impedance setting function of the device of the invention, the change of the load of the electrical equipment greatly reduces the influence on the high-frequency impedance of the power line. The same impedance setting function is realized in a wide frequency range, which is much wider than the frequency range of narrow-band wave traps and other grid carrier impedance adjusters.

3. The channel optimization device of the power line high-speed data communication system not only prevents the interference noise generated by electrical equipment from entering the power grid, but also has the function of adjusting the high-frequency impedance of the power network line within a wide frequency range, optimizing the performance of the high-frequency carrier channel of the power line.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and practical examples.

Accompanying drawing 1 is the equivalent figure of channel optimization device of the present invention;

Accompanying drawing 2 is the circuit schematic diagram of channel optimization device of the present invention; And

Accompanying drawing 3 is the schematic diagram of the use and installation of the channel optimization device of the present invention.

Detailed ways

Now, the channel optimization device for power line high-speed data communication system of the present invention will be specifically described with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar components.

Referring to Figure 1, the channel optimization device of the present invention can be equivalent to a six-port network, which is connected in series between the user's electrical equipment and the power line power supply when in use. As shown in Figure 1, the terminals 1 and 2 of the channel optimization device are respectively connected to the phase wire and the ground wire of the power line power supply, and the terminals 1' and 2' are respectively connected to the phase wire and the ground wire of the user's electrical equipment, and the channel optimization device The other two terminals (G) are grounded.

On the one hand, since the ground wire also presents high high-frequency impedance to the noise generated by electrical equipment, the circuit of the channel optimization device of the present invention simultaneously filters the two input wires of the phase line and the ground wire, and makes the It can suppress not only serial mode noise, but also common mode noise.

On the other hand, the channel optimization device of the present invention is a low-pass circuit, which has almost no influence on the 50Hz power frequency signal, but has a large attenuation to the high-frequency interference noise signal, so as to prevent noise from entering the power line channel; The high-frequency carrier signal presents a higher impedance, which reduces the reflection loss and capacitive absorption loss of the electrical equipment to the high-frequency carrier signal, thereby optimizing the power line high-speed data communication channel.

As shown in Fig. 2, the circuit of the channel optimization device of the present invention is composed of an inductance coil and a capacitor. The terminals 1 and 2 of the channel optimization device are respectively connected to the phase wire and the ground wire of the power line circuit (that is, the power line power supply), the terminal 1 is connected to one end of the inductance coil L1, and the terminal 2 is connected to one end of the inductance coil L2, and the capacitor C1 Connected between the other ends of the inductance coils L1 and L2, correspondingly, the inductance coils L1, L2 and capacitor C1 connected in series on the power line constitute a low-pass network part 3, which effectively suppresses high-frequency series mode noise, and at the same time, It can be seen from the high-frequency signal inductance XL=ωL that the existence of the inductance coils L1 and L2 connected in series on the power line can effectively improve the impedance of the high-frequency carrier signal and play a role in adjusting the impedance of the high-frequency signal. Capacitor C1 is preferably in the range of 0.01-0.1 μF (withstand voltage 275V). Considering the volume and overload current, unlike general power filters, the inductance values of L1 and L2 are preferably in the range of 10-20 μH.

The terminal 1' of the channel optimization device is respectively connected to one end of the inductance coil L3 and the capacitor C3, the terminal 2' is respectively connected to one end of the inductance coil L4 and the capacitor C2, and the other end of the capacitors C3 and C2 is grounded, and has a common mode of the magnetic core The other ends of the inductance coils L3 and L4 are respectively connected to the two ends of the capacitor C1. Correspondingly, the filter circuit part 4 composed of common-mode inductance coils L3, L4 and capacitors C2, C3 can effectively suppress common-mode interference noise. The inductance coil L3, L4 is preferably about 1mH, and the capacitance C2, C3 is preferably no less than 1000pF but no more than 4700pF (withstand voltage 275V).

In addition, in the channel optimization device of the present invention, the inductance coils L3 and L4 can also be removed, and the capacitor C1 can be directly connected between the phase line and the ground wire of the user's electrical equipment, but it is preferable that the channel optimization device of the present invention has an inductance The coils L3 and L4, preferably the inductors L3 and L4 are common mode inductors with a magnetic core.

Accompanying drawing 3 is the schematic diagram of the use and installation of the channel optimization device of the present invention. During use, the channel optimization device 10 for the power line high-speed data communication system of the present invention is connected in series between the user's electrical equipment 12 (the user's electrical appliance power socket in the figure) and the power line power supply 13 (the wall power socket in the figure) , to effectively reduce the impact of user load on the power line high-frequency carrier channel.

Although the present invention has been described, the above description is only for the purpose of illustration, and the present invention is not limited to the above specific description in conjunction with the accompanying drawings, and those skilled in the art can make various changes without departing from the spirit of the present invention, and the present invention The scope of protection of the invention is defined by the appended claims.

Claims (7)

1, a kind of channel optimization means that is used for the high speed power line communication system, described channel optimization means is serially connected between consumer electronics equipment and the powerline power supply, it is characterized in that this channel optimization means comprises the device (3,4) that phase line and ground wire are carried out filtering simultaneously.

2, channel optimization means as claimed in claim 1, it is characterized in that described channel optimization means comprises low-pass network part (3) and filter circuit part (4), wherein said low-pass network part is connected with powerline power supply, be used to suppress the high frequency series mode noise, described filter circuit part is connected with consumer electronics equipment, is used to suppress the common mode disturbances noise.

3, channel optimization means as claimed in claim 2, it is characterized in that, this low-pass network part is made of first and second inductance coils (L1, L2) and first electric capacity (C1), one end of described inductance coil (L1, L2) is connected with ground wire with the phase line of powerline power supply respectively, and first electric capacity (C1) is connected across between the other end of described two inductance coils (L1, L2) and is connected across between the phase line and ground wire of consumer electronics equipment; And described filter circuit part is made of the second and the 3rd electric capacity (C2, C3), and second is connected its other end ground connection respectively with an end of the 3rd electric capacity with ground wire with the phase line of consumer electronics equipment.

4, channel optimization means as claimed in claim 3, it is characterized in that described channel optimization means also comprise the phase line of the end that is connected to first electric capacity (C1) and consumer electronics equipment and be connected the other end of first electric capacity (C1) and the ground wire of consumer electronics equipment between third and fourth inductance coil (L3, L4).

5, channel optimization means as claimed in claim 4 is characterized in that third and fourth inductance coil (L3, L4) is the common mode inductance coil with magnetic core.

6. as each described channel optimization means among the claim 3-5, it is characterized in that first electric capacity is 0.01-0.1 μ F.

7. channel optimization means as claimed in claim 6, the value that it is characterized in that the second and the 3rd electric capacity is not less than 1000pF but is not more than 4700pF.

Images