CN217114747U - Port physical layer isolation signal coupler for network telephone exchange network card - Google Patents

Abstract

The utility model relates to a port physical layer isolation signal coupler for internet phone switching network card belongs to the data network communication technical field of electric power enterprise. The utility model comprises an I-shaped high-frequency magnetic core, 2 groups of 1:1 coils are wound on the I-shaped high-frequency magnetic core, and the coupler is linked between four network switching chips of the network telephone switching network card and an independent PCIE network card chip; the I-shaped high-frequency magnetic core adopts 10000u of mirror surface open air gap high magnetic conductivity, and the external dimension is an I-shaped magnetic core with the length of 3.5mm, the height of 1.8mm and the width of 1.6 mm. The utility model discloses a performance index satisfies the designing requirement of internet phone switching network card completely, has low in production cost, small, the reliable advantage of data communication, can replace traditional network transformer and high frequency capacitance's coupling mode completely.

Description

Port physical layer isolation signal coupler for network telephone exchange network card

Technical Field

The utility model relates to a port physical layer isolation signal coupler for internet phone switching network card belongs to the data network communication technical field of electric power enterprise.

Background

The network telephone is installed and used in a large number in each unit of a power grid, and network connection interruption caused by network equipment and telephone power interruption, faults and the like can be reduced by adopting the network card with the telephone switching function. The network telephone exchange network card consists of four network exchange chips and independent PCIE network card chips, a signal coupler is required to be added into port physical layer interfaces of the exchange chips and the network card chips so as to realize isolation and interface mode matching between systems, an HPY network transformer or a high-frequency capacitor can be used for transmitting and receiving signals according to the traditional design method, the network transformer is in a standard design mode of Ethernet communication HPY and is used for data communication and signal isolation between different physical systems, the anti-interference capability is strong, and the stability is high; the high-frequency capacitive coupling mode is mainly used for connecting links in a board, and has the advantages of simple design and low cost, but the number of elements is large.

The network telephone exchange network card consists of four network exchange chips and independent PCIE network card chips, and a signal coupler is required to be added to the port physical layer interfaces of the exchange chips and the network card chips so as to realize the isolation and interface mode matching between systems. However, there are problems with the giga-network transformers, such as the H82409S type network transformer encapsulated with SOP24, with the dimensions: 18.5mm 18.2mm 4mm, the volume of which exceeds the size of the main chip, and the layout and the routing of the PCB are greatly influenced; if high-frequency capacitors are used for signal coupling, about 48 resistive-capacitive elements are also needed to form a complete circuit, which also has the above problems.

The utility model relates to a low cost, small and exquisite port physical layer isolation signal coupler satisfies the requirement of internet protocol telephone switching network card.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the utility model provides a port physical layer isolation signal coupler for network telephone switching network card, low cost, small in size satisfy network telephone switching network card's requirement.

The utility model adopts the technical scheme that: a port physical layer isolation signal coupler for a network telephone switching network card comprises an I-shaped high-frequency magnetic core, wherein 2 groups of 1:1 coils are wound on the I-shaped high-frequency magnetic core, and the coupler is connected between four port network switching chips of the network telephone switching network card and an independent PCIE network card chip.

As a further aspect of the present invention, the i-shaped magnetic core adopts 10000u of mirror surface open air gap high permeability, and the external dimension is 3.5mm long and 1.8mm high and 1.6mm wide.

As a further proposal of the utility model, a paster manufacturing process is adopted.

As a further aspect of the present invention, when 2 groups of 1:1 coils are wound on the i-shaped high frequency magnetic core, when the Y1 coil is wound first, the core frame is wound in order for 80 turns, and the tap is released as the pin 1 and the pin 5, and when the Y2 coil is wound, the Y2 coil firstly winds the enameled wire in parallel for 40 turns, wherein 2 taps at one end are connected in parallel and together used as the center tap to release the 3 rd pin, and the other 2 taps are respectively used as the 2 nd pin and the 4 th pin.

The utility model has the advantages that:

1. the performance index of the utility model can completely meet the design requirement of the network telephone exchange network card, has the advantages of low production cost, small volume and reliable data communication, and can completely replace the coupling mode of the traditional network transformer and the high-frequency capacitor;

2. the utility model discloses saving PCB space that can be fine obtains nimble walking line and overall arrangement, very big design advantage and cost advantage for bulky high-priced traditional PHY network transformer.

Drawings

FIG. 1 is a schematic diagram of an application of a signal coupler;

FIG. 2 is a schematic diagram of a conventional PHY network transformer circuit;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic structural diagram of the group 4 of the present invention;

FIG. 5 is a schematic diagram of the external dimensions of the present invention;

FIG. 6 is a schematic diagram of the data of the bonding pad of the present invention using the chip-mounting process;

fig. 7 is a schematic diagram of the pin arrangement of the present invention;

fig. 8 is a schematic side-by-side layout of the present invention;

fig. 9 is a schematic view of the staggered layout of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1: a port physical layer isolation signal coupler for a network telephone switching network card comprises an I-shaped high-frequency magnetic core, wherein 2 groups of 1:1 coils are wound on the I-shaped high-frequency magnetic core, and the coupler is connected between four port network switching chips of the network telephone switching network card and an independent PCIE network card chip. The network telephone switching network card consists of four network switching chips and independent PCIE network card chips, and a port physical layer isolation signal coupling circuit is needed between two mutually independent physical systems to complete the link; as shown in fig. 1; the utility model discloses port physical layer keeps apart signal coupling circuit has two effects, firstly, signal transmission, it couples the difference signal that PHY sent out to another physical system of different levels with the mode of differential mode coupling to prevent that different voltage differences from influencing data communication or damaging equipment; and secondly, isolation protection is performed, so that the dangers of lightning protection, high-voltage mistaken access prevention and the like are achieved, and the safety of equipment is protected.

As shown in fig. 2, the conventional PHY network transformer also plays roles of impedance matching and common mode simulation in addition to balancing port levels, and the main design purpose is to enable high-quality transmission of network signals over long distances, and has the roles of signal transmission, impedance matching, waveform restoration, signal noise suppression, high-voltage isolation, and the like, so that the design is complicated.

Each group of PHY network transformers respectively consists of 4 differential mode coil windings and 2 common mode coil windings, when network differential signals with equal current and opposite directions pass through the differential mode coils, magnetic fluxes with equal current and opposite directions are generated in the coils and are mutually counteracted, the differential network signals can smoothly pass through the coils, when the common mode signals pass through the coils, the magnetic fluxes with equal current and same direction are formed in the coils, a large obstruction is formed for the common mode signals, the common mode signals and the common mode currents flow in the same direction on the two conducting wires and return to the ground through capacitors, the transmission of the common mode currents is prevented, and interference signals are prevented from flowing through the coupling circuit. In addition, various losses, lightning protection, overload prevention and other factors need to be considered for the transformer winding, thicker copper wires and a larger-volume annular magnetic core are needed in design to meet the requirements, and the complexity and the volume of the transformer are increased due to the addition of the common-mode winding.

As the port physical layer isolation signal coupler of the network telephone exchange network card is only limited to signal coupling in the circuit board, the signal transmission distance is short, and the problems of signal transmission loss, common mode interference and the like do not need to be considered, the design of the coupler can be greatly simplified, the cost of devices is reduced, the design volume is reduced, and the layout of a PCB is optimized. The coupler was fabricated using a 3.5mm (length) by 1.6mm (width) by 1.8mm (height) h-core, on which 2 sets of 1:1 coils were wound, the principle being shown at T1 in fig. 3.

In fig. 3, first, the differential signal from PHY1 flows through the Y1 coil to generate an alternating magnetic field, the Y2 coil at the other end of the coupler has a center tap, the Y2 coil can output equal and opposite differential signals to PHY2 to complete data exchange, and the capacitor C1 at the center tap of Y2 is used to provide a bias voltage with a capacity of 100 pF. The coupler has the function of impedance matching, and proper output impedance can be obtained through proper turns of the coil, so that an impedance matching network can be omitted during circuit design when the PCB is in communication in a very short distance, and the complexity of PCB wiring is greatly simplified compared with a traditional network transformer. In the application of the network telephone switching network card, the PHY is a pair of complete giga PHY ports, and at this time, 4 couplers are needed to realize signal isolation of 2 groups of transmission and 2 groups of reception, as shown in fig. 4;

as a further aspect of the present invention, the i-shaped magnetic core has 10000u of mirror surface with air gap and high magnetic permeability, and has an outer dimension of 3.5mm in length and 1.8mm in height and 1.6mm in width, as shown in fig. 5;

as a further proposal of the utility model, the utility model discloses a paster preparation technology, pad data are as shown in 6.

As a further scheme of the utility model, when winding 2 groups of 1:1 coils on the I-shaped high-frequency magnetic core, the coil adopts the oxygen-free copper enameled wire winding with the wire diameter of 0.1mm, when winding the Y1 coil first, regularly wind 80 circles in the magnetic core skeleton, the tap is discharged to be the pin 1 and the pin 5, when winding the Y2 coil again, the Y2 coil firstly connects the enameled wire double strand in parallel and winds 40 circles, wherein 2 taps at one end are connected together in parallel and discharged to the 3 rd pin as the center tap, in addition, 2 taps are respectively used as the 2 nd pin and the 4 th pin, and the pin arrangement is as shown in figure 7;

the invention is a port physical layer isolation signal coupler special for network telephone switching network cards of power grid companies, the coupler plays the role of level isolation and signal coupling between a switching system PHY and a PCIE network card system PHY in the switching network card, 4 couplers are needed for completing 2 groups of signal sending and 2 groups of signal receiving coupling for a kilomega PHY port, the coupler is required to be placed between a switching chip and a PCIE network card chip when a PCB is designed, the routing of a PHY signal line is required to be subjected to impedance matching and is strictly routed according to the routing requirement of a differential signal, and a 1.5mm spacing distance is required to be reserved when 4 couplers are arranged side by side to prevent mutual interference between signals, as shown in figure 8; to reduce interference between couplers, a staggered layout as in fig. 9 may also be used, where PCB layout conditions allow;

the port physical layer isolation signal coupler of the network telephone switching network card can well save PCB space, obtain flexible wiring and layout, and has great design advantages and cost advantages compared with the traditional PHY network transformer which is large in size and high in price.

While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (3)

1. A port physical layer isolation signal coupler for a network telephone switching network card, comprising: the network telephone switching network card comprises an I-shaped high-frequency magnetic core, wherein 2 groups of 1:1 coils are wound on the I-shaped high-frequency magnetic core, and the coupler is connected between four network switching chips of the network telephone switching network card and an independent PCIE network card chip.

2. The port physical layer isolation signal coupler for a network telephony switching network card of claim 1, wherein: the I-shaped magnetic core is 10000u of mirror surface open air gap high magnetic conductivity, and the external dimension is 3.5mm long, 1.8mm high and 1.6mm wide.

3. The port physical layer isolation signal coupler for a network telephony switching network card of claim 1, wherein: a patch manufacturing process is adopted.

Images