CN207677639U - A kind of network transformer circuit - Google Patents
A kind of network transformer circuit Download PDFInfo
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- CN207677639U CN207677639U CN201721232570.9U CN201721232570U CN207677639U CN 207677639 U CN207677639 U CN 207677639U CN 201721232570 U CN201721232570 U CN 201721232570U CN 207677639 U CN207677639 U CN 207677639U
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- transformer
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Abstract
The utility model discloses a kind of network transformer circuits, including sequentially connected coupling module, auto-transformer, coupling module is for accessing difference mode signal, carry out bidirectional couple and isolated DC part, the auto-transformer is for stablizing difference mode signal and surge of releasing, junction capacity is not present in auto-transformer, useful signal not can be filtered, eye pattern tends to be perfect, the transmission of signal is set more to stablize, and auto-transformer can filter out just, the surge voltage and surge current of negative sense, it can also filter simultaneously between going offline GND, surge between line line, with higher practicability and safety, and cost is relatively low, it is suitble to promote the use of.
Description
Technical field
The utility model is related to electronic field, especially a kind of network transformer circuit.
Background technology
In ethernet device, we can use a common device in the connection of PHY or RJ45 interfaces, be called network
Transformer.Network transformer effect is mainly signal potential coupling, and external interference is isolated, and realizes impedance matching.Traditional network
Transformer is released surge voltage or surge current usually using zener diode, but zener diode junction capacity is larger, can filter
Fall useful signal, while zener diode has directionality, positive surge voltage or surge current can only be filtered out, for
The surge voltage or surge current of negative sense can puncture zener diode moment.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide a kind of network transformation using auto-transformer
Device circuit.
The technical solution adopted in the utility model is：
A kind of network transformer circuit, including at least one submodule, the submodule include sequentially connected coupled mode
Block, auto-transformer, the coupling module are electrically connected that the straight of difference mode signal is isolated with external difference mode signal input terminal
Stream part is simultaneously coupled, and the auto-transformer is for stablizing difference mode signal and releasing.
The utility model further includes the common mode inductance for inhibiting electromagnetic interference, described common mode inductance one end and coupling module
It is electrically connected, the other end and auto-transformer are electrically connected.
The coupling module includes capacitance C1 and capacitance C2, and the first port of capacitance C1 and auto-transformer is electrically connected,
The third port of capacitance C2 and auto-transformer is electrically connected, the second port of auto-transformer, the 4th port ground connection.
The utility model further includes the common mode inductance L1 for inhibiting electromagnetic interference, the first port of common mode inductance L1 with
Capacitance C1 is electrically connected, and the 4th port and the capacitance C2 of common mode inductance L1 are electrically connected, the second port of common mode inductance L1 with from
The first port of coupling transformer is electrically connected, and the third port of common mode inductance L1 and the third port of auto-transformer electrically connect
It connects.
The utility model further includes one end and the capacitance C1 electricity of protective resistance R1, protective resistance R2, the protective resistance R1
Property connection, the other end and auto-transformer first port be electrically connected, one end of the protective resistance R2 and capacitance C2 are electrical
The third port of connection, the other end and auto-transformer is electrically connected.
The beneficial effects of the utility model：
The utility model includes sequentially connected coupling module, auto-transformer, coupling module for access difference mode signal,
Bidirectional couple and isolated DC part are carried out, the auto-transformer is for stablizing difference mode signal and surge of releasing, auto-transformer
There is no junction capacity, useful signal not can be filtered, and eye pattern tends to be perfect, and the transmission of signal is made more to stablize, and from
Coupling transformer can filter out it is positive and negative to surge voltage and surge current, while can also filter go offline-GND between, line-
Surge between line has higher practicability and safety, and cost is relatively low, is suitble to promote the use of.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
Fig. 1 is the circuit diagram of the utility model.
Fig. 2 is another circuit diagram of the utility model.
Specific implementation mode
As shown in Figure 1, a kind of network transformer circuit, including at least one submodule, the submodule include connecting successively
Coupling module, the auto-transformer connect, it is poor for being isolated that the coupling module is electrically connected with external difference mode signal input terminal
The direct current component of mould signal is simultaneously coupled, and the auto-transformer for stablizing difference mode signal and releasing, do not deposit by auto-transformer
In junction capacity, useful signal not can be filtered, and eye pattern tends to be perfect, so that the transmission of signal is more stablized, and self coupling becomes
Depressor can filter out it is positive and negative to surge voltage and surge current, zener diode can only filter go offline-GND between just
To surge, do not work for the surge between line-line, and auto-transformer can filter between going offline-GND, line-line it
Between surge, the surge highest between line-line may filter that the voltage of 2KV, the surge highest of line-GND may filter that 6KV's
Voltage has higher practicability and safety.In the present embodiment, there are two submodule tools, auto-transformer includes but not
It is confined to auto-transformer Q1, auto-transformer Q2.
The utility model further includes the common mode inductance for inhibiting electromagnetic interference, described common mode inductance one end and coupling module
It is electrically connected, the other end and auto-transformer are electrically connected.
The coupling module includes capacitance C1 and capacitance C2, and the first port of capacitance C1 and auto-transformer Q1 electrically connects
It connects, the third port of capacitance C2 and auto-transformer Q1 is electrically connected, and the second port of auto-transformer Q1, the 4th port connect
Ground, capacitance C1 and capacitance C2 are used to filter the direct current signal in difference mode signal, and the capacitance of capacitance C1 and capacitance C2 should keep suitable
In, capacitance is bigger, and the low frequency cut-off points of signal are lower, and more low frequency noises are sucked in circuit, if capacitance is too small, can make signal
Low-frequency range decay, cause IEEE test survey only the problem of.
The utility model further includes the common mode inductance L1 for inhibiting electromagnetic interference, the first port of common mode inductance L1 with
Capacitance C1 is electrically connected, and the 4th port and the capacitance C2 of common mode inductance L1 are electrically connected, the second port of common mode inductance L1 with from
The first port of coupling transformer Q1 is electrically connected, and the third port and the third port of auto-transformer Q1 of common mode inductance L1 is electrical
Connection, common mode inductance L1 can effectively inhibit common mode interference signal, on the differential mode information of normal transmission in circuit without influence, altogether
Mould inductance L1 has the filtration of electromagnetic interference, keeps network signal transmission bandwidth wider, and transmission is more stable, and transmission speed is more
Soon.
As shown in Fig. 2, the utility model further includes protective resistance R1, protective resistance R2, one end of the protective resistance R1
It is electrically connected with capacitance C1, the first port electric connection of the other end and auto-transformer Q1, one end of the protective resistance R2
It is electrically connected with capacitance C2, the third port electric connection of the other end and auto-transformer Q1, protective resistance R1, protective resistance
R2 can further prevent the high voltage and high current caused by the mutation of voltage and current in circuit, further increase the stabilization of circuit
Property and safety.
The foregoing is merely the preferred embodiments of the utility model, the utility model is not limited to above-mentioned embodiment party
Formula, if with essentially identical means realize the technical solution of the utility model aim belong to the scope of protection of the utility model it
It is interior.
Claims (4)
1. a kind of network transformer circuit, it is characterised in that:Including at least one submodule, the submodule includes being sequentially connected
Coupling module, auto-transformer, the coupling module is electrically connected that differential mode is isolated with external difference mode signal input terminal
The direct current component of signal is simultaneously coupled, and the auto-transformer is for stablizing difference mode signal and surge of releasing, the coupling module
Including capacitance C1 and capacitance C2, the first port of capacitance C1 and auto-transformer is electrically connected, capacitance C2 and auto-transformer
Third port is electrically connected, the second port of auto-transformer, the 4th port ground connection.
2. a kind of network transformer circuit according to claim 1, it is characterised in that：Further include for inhibiting electromagnetic interference
Common mode inductance, described common mode inductance one end and coupling module are electrically connected, the other end and auto-transformer are electrically connected.
3. a kind of network transformer circuit according to claim 1, it is characterised in that：Further include for inhibiting electromagnetic interference
Common mode inductance L1, the first port of common mode inductance L1 is electrically connected with capacitance C1, the 4th port and the electricity of common mode inductance L1
Hold C2 to be electrically connected, the second port of common mode inductance L1 and the first port of auto-transformer are electrically connected, common mode inductance L1's
Third port and the third port of auto-transformer are electrically connected.
4. a kind of network transformer circuit according to claim 1, it is characterised in that：Further include protective resistance R1, protection
One end of resistance R2, the protective resistance R1 and the first port of capacitance C1 electric connections, the other end and auto-transformer are electrical
Connection, one end and capacitance C2 electric connections of the protective resistance R2, the third port of the other end and auto-transformer electrically connect
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721232570.9U CN207677639U (en) | 2017-09-22 | 2017-09-22 | A kind of network transformer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721232570.9U CN207677639U (en) | 2017-09-22 | 2017-09-22 | A kind of network transformer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207677639U true CN207677639U (en) | 2018-07-31 |
Family
ID=62953953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721232570.9U Active CN207677639U (en) | 2017-09-22 | 2017-09-22 | A kind of network transformer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207677639U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111277223A (en) * | 2020-03-09 | 2020-06-12 | 东南大学 | High-order coupling network with interference suppression and application thereof |
| CN117118424A (en) * | 2023-02-13 | 2023-11-24 | 荣耀终端有限公司 | Network voltage transformation circuit and electronic equipment |
-
2017
- 2017-09-22 CN CN201721232570.9U patent/CN207677639U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111277223A (en) * | 2020-03-09 | 2020-06-12 | 东南大学 | High-order coupling network with interference suppression and application thereof |
| CN111277223B (en) * | 2020-03-09 | 2021-06-29 | 东南大学 | High-order coupling network with interference suppression and application thereof |
| CN117118424A (en) * | 2023-02-13 | 2023-11-24 | 荣耀终端有限公司 | Network voltage transformation circuit and electronic equipment |
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