CN211377579U - Net gape earth leakage protection circuit based on electric capacity is kept apart - Google Patents
Net gape earth leakage protection circuit based on electric capacity is kept apart Download PDFInfo
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- CN211377579U CN211377579U CN202020103921.1U CN202020103921U CN211377579U CN 211377579 U CN211377579 U CN 211377579U CN 202020103921 U CN202020103921 U CN 202020103921U CN 211377579 U CN211377579 U CN 211377579U
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Abstract
The utility model discloses a net gape earth leakage protection circuit based on electric capacity is kept apart, and net gape protection technical field. The network port is provided with 8 pins 1-8, the network port is connected with a primary winding of the network transformer through the pins, a capacitor is connected to a connecting line of the network port and the primary winding of the network transformer, one end of the capacitor is connected with the pins of the network port, and the other end of the capacitor is connected with one end of the primary winding of the network transformer. The capacitance value of the capacitor is 10nF-100nF/500V-1000V, and the capacitor has the characteristics of isolating direct current, alternating current, high frequency and low frequency, and can be used for isolating and protecting the leakage of a power line in the integrated line. For a network port of hundreds of million and below (10 million), all 4 pins used during the operation of the network port are subjected to capacitance isolation protection; to the giga net gape, carried out electric capacity isolation protection to whole 8 pins that the net gape during operation was used, consequently the utility model discloses can realize keeping apart earth leakage protection entirely, avoid or reduce the user and suffer the loss because of the cable electric leakage.
Description
Technical Field
The utility model relates to a net gape protection technical field specifically is a net gape earth leakage protection circuit based on electric capacity is kept apart.
Background
When a monitoring system or other weak current engineering is used for network wiring, cables of a 4-core network cable and a power supply integrated line and cables of an 8-core network cable and a power supply integrated line are often used, namely, a power supply line and a network cable are combined into a whole. Some power cords in the body line pass through low voltage as required, and some power cords in the body line pass through 220V or even higher voltage, and when the power cord through low voltage or high voltage takes place the electric leakage, the electric leakage will get into network equipment through the net twine, leads to equipment operation to receive the interference, and even equipment is damaged. Taking the pins 1 and 2 of the monitoring system network port shown in fig. 1 as an example, it can be seen from the figure that the pins 1 and 2 of the network port are communicated through the network transformer winding, and when the power line in the integrated line leaks electricity, the network transformer winding connected with the pins 1 and 2 of the network port is burnt through. If the 2 and 6 pins of the network port are leaked, the leakage voltage is short-circuited through the center tap of the winding, and equipment damage can also be caused. Most of the prior art for protecting the network port is lightning protection for the network port, and no technical literature is disclosed for specifically protecting the leakage of the network port.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model provides a net gape earth leakage protection circuit based on electric capacity is kept apart.
The technical scheme of the utility model is that:
the utility model provides a net gape earth leakage protection circuit based on electric capacity is kept apart, the net gape has 8 pins 1-8, the net gape is through its pin connection network transformer primary winding, inserts electric capacity on the net gape and the connecting wire of network transformer primary winding, the pin of net gape is connected to one end of electric capacity, the other end of electric capacity is connected one end of network transformer primary winding.
Preferably, according to the capacitive isolation based net port leakage protection circuit, the network transformer has two groups of primary windings; a first pin 1 of the network port is connected with an a end of a first primary winding of the network transformer through a first capacitor C1; the second pin 2 of the network port is connected with the b end of the first primary winding of the network transformer through a second capacitor C2; a third pin 3 of the network port is connected with the C end of a second primary winding of the network transformer through a third capacitor C3; and the sixth pin 6 of the network port is connected with the d end of the second primary winding of the network transformer through a fourth capacitor C4.
Preferably, according to the capacitive isolation based net port leakage protection circuit, the network transformer has four groups of primary windings; a first pin 1 of the network port is connected with an a end of a first primary winding of the network transformer through a first capacitor C1; the second pin 2 of the network port is connected with the b end of the first primary winding of the network transformer through a second capacitor C2; a third pin 3 of the network port is connected with the C end of a second primary winding of the network transformer through a third capacitor C3; a sixth pin 6 of the network port is connected with the d end of the second primary winding of the network transformer through a fourth capacitor C4; a fourth pin 4 of the network port is connected with an e end of a third primary winding of the network transformer through a fifth capacitor C5; a fifth pin 5 of the network port is connected with the f end of a third primary winding of the network transformer through a sixth capacitor C6; a seventh pin 7 of the network port is connected with the g end of a fourth primary winding of the network transformer through a seventh capacitor C7; and an eighth pin 8 of the network port is connected with the h end of the fourth primary winding of the network transformer through an eighth capacitor C8.
Preferably, according to the net port leakage protection circuit based on capacitance isolation, the capacitance of the capacitor is 10nF-100 nF/500V-1000V.
Preferably, according to the net port leakage protection circuit based on capacitance isolation, the capacitor is a ceramic capacitor.
The utility model has the advantages that:
the utility model discloses a net gape earth leakage protection circuit based on electric capacity is kept apart sets up the electric capacity of 10nF-100nF/500V-1000V appearance value at the net gape, and this electric capacity has and separates direct interchange and the characteristic that leads to the high frequency (for example more than 10 million) separate the low frequency (for example 50-60Hz power frequency), carries out isolation protection to power cord electric leakage in the line of a whole. For the network ports of hundreds of million and below (10 million), the utility model carries out capacitance isolation protection on all 4 pins used when the network ports work; to giga net gape, the utility model discloses a whole 8 pins that use to the net gape during operation have carried out electric capacity isolation protection, consequently the utility model discloses a net gape earth leakage protection circuit based on electric capacity is kept apart can realize keeping apart earth leakage protection entirely, avoids or reduces the user and suffers the loss because of the cable electric leakage.
Drawings
FIG. 1 is a schematic diagram of the connection between a network port and a network transformer without leakage protection;
fig. 2 is a schematic diagram of the wiring of the capacitive isolation-based net mouth leakage protection circuit for the net mouths of the hundreds of megabits and below;
FIG. 3 is a schematic diagram of the connection between a gigabit Ethernet port and a network transformer without using the leakage protection of the Ethernet port;
fig. 4 is a schematic diagram of the utility model of the network port leakage protection circuit based on capacitance isolation for the gigabit network port;
among them, 100-network port; 200-network transformer; 1, a first pin of a network port; 2-a second pin of the network port; 3-a third pin of the network port; 4-a fourth pin of the network port; 5-fifth pin of net mouth; 6-sixth pin of network port; 7-seventh pin of net mouth; 8, an eighth pin of the network port; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; c4 — fourth capacitance; c5 — fifth capacitance; c6 — sixth capacitance; c7 — seventh capacitance; c8 — eighth capacitance; a-one end of a first primary winding of a network transformer; b-the other end of the first primary winding of the network transformer; c-one end of the second primary winding of the network transformer; d-the other end of the second primary winding of the network transformer; e-one end of the third primary winding of the network transformer; f-the other end of the third primary winding of the network transformer; g-one end of the fourth primary winding of the network transformer; h-the other end of the fourth primary winding of the network transformer; a + b-the middle tap of the first primary winding of the network transformer; c + d-the middle tap of the second primary winding of the network transformer; e + f-a middle tap of a third primary winding of the network transformer; g + h-the center tap of the fourth primary winding of the network transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A net mouth electric leakage protection circuit based on electric capacity is kept apart, net mouth 100 has 8 pins 1 to 8, net mouth 100 passes through its pin and connects network transformer 200 primary winding, inserts electric capacity on the connecting wire of net mouth 100 and network transformer 200 primary winding, the pin of net mouth 100 is connected to the one end of electric capacity, the one end of the other end connection network transformer 200 primary winding of electric capacity.
Example 1:
as shown in fig. 1, the existing one hundred million and less (10 million) network ports 100 are connected to the primary winding of the network transformer through pins 1 and 2 and pins 3 and 6, respectively; the network transformer 200 has two sets of primary windings: a first primary winding ab and a second primary winding cd; each group of primary windings has 1 central tap, which is respectively represented by a + b and c + d; the center tap a + b of the first primary winding and the center tap c + d of the second primary winding are connected together and then connected with the mainboard through 1 capacitor; wherein pin 1 of the network port 100 is directly connected to the a-terminal of the first primary winding of the network transformer 200, pin 2 is directly connected to the b-terminal of the first primary winding of the network transformer 200, pin 3 is directly connected to the c-terminal of the second primary winding of the network transformer 200, and pin 6 is directly connected to the d-terminal of the second primary winding of the network transformer 200. In practical application, when a power line of the integrated line leaks electricity, the network line in the integrated line is affected by the leakage, if the network line connected with the network port pin 1 is in lap joint with a live wire of the power line, and the network line connected with the network port pin 3 is in lap joint with a zero line of the power line, leakage current flows to an a end of a first primary winding of the network transformer through the network port pin 1 in sequence, then flows to a center tap a + b of the first primary winding, flows to a c end of a second primary winding of the network transformer through a center tap c + d of the second primary winding, and finally forms a loop due to the fact that the c end is connected with the network port pin 3, the transformer is burnt, and serious consequences are caused.
In order to solve the above problem, when the net port leakage protection circuit based on capacitance isolation of the present invention is implemented on the net port 100 of the above hundred mega and below (10 mega), as shown in fig. 2, pin 1 of the net port 100 is connected to the a end of the first primary winding of the network transformer 200 through the first capacitor C1, pin 2 of the net port 100 is connected to the b end of the first primary winding of the network transformer 200 through the second capacitor C2, pin 3 of the net port 100 is connected to the C end of the second primary winding of the network transformer 200 through the third capacitor C3, and pin 6 of the net port 100 is connected to the d end of the second primary winding of the network transformer 200 through the fourth capacitor C4. When the power line of the integrated line leaks electricity, if the network line connected with the network port pin 1 is lapped with the live line of the power line, and the network line connected with the network port pin 3 is lapped with the zero line of the power line, when the leakage current flows to the capacitor C1 through the pin 1 of the network port 100, the leakage voltage and the leakage current are blocked by the capacitor C1 according to the characteristics that the capacitor blocks direct traffic and high frequency blocks low frequency. Similarly, the leakage of pin 3 of the network port 100 is blocked by the capacitor C3, thereby protecting the network port. To hundred million and following (10 million) net gapes, the utility model discloses a net gape earth leakage protection circuit based on electric capacity is to having carried out isolation protection to whole 4 pins of net gape, so the utility model discloses a net gape earth leakage protection circuit based on electric capacity is kept apart can realize keeping apart earth leakage protection entirely.
The capacitor described in the embodiment adopts a ceramic capacitor, and the capacity is 10nF-100 nF/500V-1000V.
Example 2:
as shown in fig. 3, the existing gigabit ethernet port 100 is connected to the primary windings of the network transformer through pins 1 to 8, and the network transformer 200 has four sets of primary windings; pin 1 is directly connected to the a end of the first primary winding of the network transformer 200, pin 2 is directly connected to the b end of the first primary winding of the network transformer 200, pin 3 is directly connected to the c end of the second primary winding of the network transformer 200, and pin 6 is directly connected to the d end of the second primary winding of the network transformer 200; the pin 4 is directly connected with the e end of the third primary winding of the network transformer; pin 5 is directly connected to the f-terminal of the third primary winding of the network transformer 200; pin 7 is directly connected to the g terminal of the fourth primary winding of the network transformer 200; pin 8 is directly connected to the h-terminal of the fourth primary winding of the network transformer 200.
When the net mouth leakage protection circuit based on capacitance isolation of the present invention is implemented on the gigabit net mouth 100, as shown in fig. 4, pin 1 of the net mouth 100 is connected to the a end of the first primary winding of the network transformer 200 through the first capacitor C1; pin 2 of the network port 100 is connected to the b terminal of the first primary winding of the network transformer 200 through a second capacitor C2; pin 3 of the network port 100 is connected to the terminal C of the second primary winding of the network transformer 200 through a third capacitor C3; pin 6 of the network port 100 is connected to the d-terminal of the second primary winding of the network transformer 200 through a fourth capacitor C4; pin 4 of the network port 100 is connected to the e-terminal of the third primary winding of the network transformer 200 through a fifth capacitor C5; pin 5 of the network port 100 is connected to the f-terminal of the third primary winding of the network transformer 200 through a sixth capacitor C6; pin 7 of the network port 100 is connected to the g end of the fourth primary winding of the network transformer 200 through a seventh capacitor C7; pin 8 of the network port 100 is connected to the h-terminal of the fourth primary winding of the network transformer 200 through an eighth capacitor C8. To giga net gape, the utility model discloses a net gape earth leakage protection circuit based on electric capacity is that whole 8 pins to the net gape have carried out isolation protection, so the utility model discloses a net gape earth leakage protection circuit based on electric capacity is kept apart can realize keeping apart earth leakage protection entirely.
The capacitor in the embodiment adopts a ceramic capacitor, and the capacity is 10nF-100 nF/500V-1000V.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a net gape earth leakage protection circuit based on electric capacity is kept apart, the net gape has 8 pins 1-8, the net gape is through its pin connection network transformer primary winding, its characterized in that: and a capacitor is connected to a connecting line between the network port and the primary winding of the network transformer, one end of the capacitor is connected with a pin of the network port, and the other end of the capacitor is connected with one end of the primary winding of the network transformer.
2. The capacitive isolation based net gape leakage protection circuit of claim 1, the network transformer having two sets of primary windings; the method is characterized in that: a first pin 1 of the network port is connected with an a end of a first primary winding of the network transformer through a first capacitor C1; the second pin 2 of the network port is connected with the b end of the first primary winding of the network transformer through a second capacitor C2; the pin 3 of the network port is connected with the end C of the second primary winding of the network transformer through a third capacitor C3; and the pin 6 of the network port is connected with the d end of the second primary winding of the network transformer through a fourth capacitor C4.
3. The capacitive isolation based net gape leakage protection circuit of claim 1, the network transformer having four sets of primary windings; the method is characterized in that: a first pin 1 of the network port is connected with an a end of a first primary winding of the network transformer through a first capacitor C1; the second pin 2 of the network port is connected with the b end of the first primary winding of the network transformer through a second capacitor C2; a third pin 3 of the network port is connected with the C end of a second primary winding of the network transformer through a third capacitor C3; a sixth pin 6 of the network port is connected with the d end of the second primary winding of the network transformer through a fourth capacitor C4; a fourth pin 4 of the network port is connected with an e end of a third primary winding of the network transformer through a fifth capacitor C5; a fifth pin 5 of the network port is connected with the f end of a third primary winding of the network transformer through a sixth capacitor C6; a seventh pin 7 of the network port is connected with the g end of a fourth primary winding of the network transformer through a seventh capacitor C7; and an eighth pin 8 of the network port is connected with the h end of the fourth primary winding of the network transformer through an eighth capacitor C8.
4. The capacitive isolation based net port leakage protection circuit according to any one of claims 1 to 3, wherein: the capacitance of the capacitor is 10nF-100 nF/500V-1000V.
5. The capacitive isolation based net port leakage protection circuit according to any one of claims 1 to 3, wherein: the capacitor is a ceramic capacitor.
6. The capacitive isolation based net port leakage protection circuit of claim 4, wherein: the capacitor is a ceramic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020103921.1U CN211377579U (en) | 2020-01-17 | 2020-01-17 | Net gape earth leakage protection circuit based on electric capacity is kept apart |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020103921.1U CN211377579U (en) | 2020-01-17 | 2020-01-17 | Net gape earth leakage protection circuit based on electric capacity is kept apart |
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| Publication Number | Publication Date |
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| CN211377579U true CN211377579U (en) | 2020-08-28 |
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| CN202020103921.1U Active CN211377579U (en) | 2020-01-17 | 2020-01-17 | Net gape earth leakage protection circuit based on electric capacity is kept apart |
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