CN205566781U

CN205566781U - Printed circuit board

Info

Publication number: CN205566781U
Application number: CN201620114408.6U
Authority: CN
Inventors: 杨成春
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Priority date: 2016-02-04
Filing date: 2016-02-04
Publication date: 2016-09-07
Anticipated expiration: 2026-02-04

Abstract

The utility model discloses a printed circuit board, include to walk line layer and big stratum, it is provided with two at least terminals on the line layer to walk, the terminal has the ground connection foot, and the ground connection foot of all terminals passes through the copper sheet of walking the line layer links to each other, be provided with at least one via hole on the copper sheet, the copper sheet passes through the via hole with big stratum is connected. The utility model discloses the ground connection foot that to walk a plurality of terminal in line layer couples together through the copper sheet, and the electrostatic charge bleed off introduced the terminal through the via hole on the copper sheet is to the big stratum in to relation of connection between the ground connection foot that cuts off the terminal and other ground wires of walking the line layer makes electrostatic charge that the terminal introduced along other ground line transmissions of walking the line layer, has changed electrostatic charge's the route of releasing, lets in the big stratum of the electrostatic charge circuit board of releasing as early as possible, thereby realizes that ESD protects.

Description

A kind of printed circuit board (PCB)

Technical field

This utility model relates to electronic technology field, particularly relates to a kind of printed circuit board (PCB).

Background technology

ESD (Electro-Static discharge) meaning is " Electro-static Driven Comb ", and electrostatic is a kind of natural phenomena, Generally produced by modes such as contact, friction, appliance chamber sensings, be characterized in gathering for a long time, high voltage (can To produce the electrostatic of several kilovolts of volts the most up to ten thousand), low electricity, small area analysis and short feature action time.For For electronic product, if ESD protection does not design, often result in electric equipment products fluctuation of service, Even damage.

For preventing ESD from endangering, people physical ability upper for printed circuit board (PCB, Printed Circuit Board) The device touched is (such as: for port and adapter etc. with external linkage；For convenience of describing, hereafter will Such devices is referred to as terminal) typically require its reliable ground of guarantee, so that human body is when contact terminal, will The electrostatic that human body is carried is discharged in the big stratum of PCB in time.

As it is shown in figure 1, in the middle of prior art, the grounding leg A of terminal is direct with other ground wires B of routing layer Connecting or be connected by the copper sheet of this layer, the electrostatic charge altered into PCB from terminal is easy to connect along with terminal The ground wire that lower margin connects channels to inside PCB, thus causes ESD to destroy.And the copper between terminal ground foot Spacing between skin and the holding wire of routing layer is the least, electrostatic charge be likely to alter this slight gap and Go on holding wire.

Therefore, often much the most punched near the grounding leg of terminal in the middle of prior art, so that electrostatic Electric charge is discharged into big stratum along via as early as possible.And it also requires on holding wire increase ESD protective device (as TVS pipe), utilize ESD protective device quickly to respond and stablize the performance of clamper, consuming in the short period of time The high voltage assembled and then protection circuit plate.But, substantial amounts of via reduces plate-making to a certain extent Efficiency, the use of ESD protective device does not only take up the position on pcb board, and adds the cost of product.

Utility model content

The purpose of this utility model is, it is provided that a kind of printed circuit board (PCB), it is achieved more effectively ESD protection, Reduce the use of ESD protective device.

For achieving the above object, this utility model embodiment provides a kind of printed circuit board (PCB), including routing layer With big stratum；

At least two terminal it is provided with on described routing layer；

Described terminal has grounding leg, and the grounding leg of all terminals is connected by the copper sheet of described routing layer；

Being provided with at least one via on described copper sheet, described copper sheet is by described via with described big stratum even Connect.

Preferably, described routing layer is disposed with holding wire, described holding wire and described grounding leg and described Distance between copper sheet is more than or equal to 20mil.

Preferably, described routing layer there also is provided signal ground, described signal ground be provided with via, Described signal ground is connected with described big stratum by described via.

Preferably, described terminal is SMD terminal or plug-in type terminal, the ground connection of described plug-in type terminal Foot is connected with described big stratum by pin.

Preferably, described printed circuit board (PCB) is television board.

Preferably, described terminal include USB terminal, HDMI terminal, tuner terminal, VGA terminal and At least one in network interface terminal.

Preferably, described holding wire includes USB circuit, HDMI circuit, high frequency tuner circuit, VGA circuit With at least one in network port circuit.

The printed circuit board (PCB) that this utility model embodiment provides, passes through copper by the grounding leg of multiple for routing layer terminals Skin couples together, in electrostatic charge bleed off terminal introduced by the via on copper sheet to big stratum, and Cut off annexation between the grounding leg of terminal and other ground wires of routing layer so that the electrostatic that terminal introduces Electric charge does not transmits along other ground wires of routing layer, changes the path of releasing of electrostatic charge, allows electrostatic charge to the greatest extent In the fast big stratum being released to circuit board, thus realize more effective ESD protection.

Further, the printed circuit board (PCB) that this utility model embodiment provides, the grounding leg of terminal and ground connection The copper sheet that foot connects, and the distance between the holding wire on routing layer is more than or equal to 20mil, is effectively prevented The electrostatic charge that terminal introduces is jumped and is channeled on other holding wires.ESD protective device can be reduced (such as TVS Pipe) use, reduce the cost of device and decrease ESD protective device position, plate face is taken.

Accompanying drawing explanation

Fig. 1 is the connection circuit of the terminal ground foot that prior art provides；

Fig. 2 is the structural representation of an embodiment of the printed circuit board (PCB) that this utility model provides.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, to the technical side in this utility model embodiment Case is clearly and completely described.

See Fig. 2, be the structural representation of an embodiment of the printed circuit board (PCB) that this utility model provides.

Described printed circuit board (PCB) includes routing layer and big stratum.Owing to big stratum is positioned at the inside of PCB, Fig. 2 The circuit layout of shown predominantly routing layer.

At least two terminal 1,2 it is provided with on described routing layer.

Described terminal has grounding leg 11,21, the grounding leg 11,21 of all terminals 1,2 pass through described in walk The copper sheet 3 of line layer is connected；

Be provided with at least one via 4 on described copper sheet 3, described copper sheet 3 by described via 4 with described greatly Stratum connects.

In the middle of being embodied as, described printed circuit board (PCB) is multi-layer sheet, and described routing layer is mainly used in signal and walks Line, is usually located at the top layer of circuit board, described big stratum (also referred to as stratum, ground plane or middle stratum) It is generally disposed at the inside of circuit board, is connected with the ground networks of other layers by via.Described terminal is preferred The device touched for people's physical ability on printed circuit board (PCB), such as connectivity port and adapter etc. with external connection. Preferred embodiment central in one, described printed circuit board (PCB) is television board.Described terminal preferably includes USB (Universal Serial Bus, USB (universal serial bus)) terminal, HDMI (High Definition Multimedia Interface, HDMI) terminal, tuner terminal, VGA (Video Graphics Array, Video Graphics Array) at least one in terminal and network interface terminal.Described terminal both may be used Think that SMD terminal can also be plug-in type terminal, and for plug-in type terminal, described plug-in type terminal Grounding leg directly can also be connected with the big stratum of circuit board by pin.

Typically there also is provided holding wire 5 on described routing layer, described holding wire 5 is for all for believing on routing layer Number transmission cabling.The signal circuit corresponding with terminal because of terminal ground foot is the most neighbouring, concrete real In the middle of executing, described holding wire 5 preferably includes USB circuit, HDMI circuit, high frequency tuner circuit, VGA electricity At least one in road and network port circuit.Described holding wire 5 and described grounding leg 11,21 and described copper sheet Distance between 3 is more than or equal to 20mil.This utility model is by increasing between holding wire and terminal ground foot Distance, effectively prevent terminal introduce electrostatic charge jump channel on other holding wires.

There also is provided signal ground (also referred to as place of working) on described routing layer, described signal ground is provided with Via, described signal ground is connected with described big stratum by described via.In the middle of prior art, terminal Grounding leg is connected toward contact with the signal ground on routing layer, and the electrostatic charge causing terminal to introduce can be along signal Ground wire, toward the internal transmission of pcb board, causes ESD to destroy.And in this utility model, the grounding leg of terminal with Annexation is there is not, the grounding leg of terminal and other ground on routing layer between other ground wires on routing layer Line is separately connected with big stratum by via so that the electrostatic charge that terminal introduces is not along routing layer Other ground wires transmit, and change the path of releasing of electrostatic charge, allow electrostatic charge be released to circuit board as soon as possible Big stratum in, thus realize effective ESD protection.

Although in the present embodiment only as a example by two terminals, it will be appreciated by a person skilled in the art that this practicality The novel situation extending to multiple terminal.

In sum, the printed circuit board (PCB) that this utility model embodiment provides, by connecing of multiple for routing layer terminal Lower margin is coupled together by copper sheet, and the electrostatic charge bleed off introduced by terminal by the via on copper sheet is to the earth In Ceng, and cut off annexation between the grounding leg of terminal and other ground wires of routing layer so that terminal The electrostatic charge introduced does not transmits along other ground wires of routing layer, changes the path of releasing of electrostatic charge, allows Electrostatic charge is released in the big stratum of circuit board as soon as possible, thus realizes the protection to ESD.

Further, the printed circuit board (PCB) that this utility model embodiment provides, the grounding leg of terminal and ground connection The copper sheet that foot connects, and distance H between the holding wire on routing layer is more than or equal to 20mil, effectively prevents The electrostatic charge jumping having stopped terminal introducing channels on other holding wires.ESD protective device can be reduced (such as TVS Pipe) use, reduce the cost of device and decrease ESD protective device position, plate face is taken.

The above is preferred implementation of the present utility model, it is noted that general for the art For logical technical staff, on the premise of without departing from this utility model principle, it is also possible to make some improvement and Retouching, these improvements and modifications are also considered as protection domain of the present utility model.

Claims

1. a printed circuit board (PCB), it is characterised in that include routing layer and big stratum；

At least two terminal it is provided with on described routing layer；

2. printed circuit board (PCB) as claimed in claim 1, it is characterised in that be disposed with letter on described routing layer Number line, the distance between described holding wire and described grounding leg and described copper sheet is more than or equal to 20mil.

3. printed circuit board (PCB) as claimed in claim 2, it is characterised in that there also is provided on described routing layer Signal ground, described signal ground is provided with via, described signal ground by described via with described greatly Stratum connects.

4. printed circuit board (PCB) as claimed in claim 3, it is characterised in that described terminal is SMD terminal Or plug-in type terminal, the grounding leg of described plug-in type terminal is connected with described big stratum by pin.

5. printed circuit board (PCB) as claimed in claim 4, it is characterised in that described printed circuit board (PCB) is TV Board.

6. the printed circuit board (PCB) as described in any one of Claims 1 to 5, it is characterised in that described terminal includes At least one in USB terminal, HDMI terminal, tuner terminal, VGA terminal and network interface terminal.

7. the printed circuit board (PCB) as described in any one of claim 2～5, it is characterised in that described holding wire bag Include at least one in USB circuit, HDMI circuit, high frequency tuner circuit, VGA circuit and network port circuit.