CN201550349U

CN201550349U - Device for preventing interference caused on system circuit by ESD

Info

Publication number: CN201550349U
Application number: CN2009201950082U
Authority: CN
Inventors: 周彤彦
Original assignee: SHENZHEN NOONTEC ELECTRONICS TECHNOLOGY Co Ltd
Current assignee: SHENZHEN NOONTEC ELECTRONICS TECHNOLOGY Co Ltd
Priority date: 2009-09-18
Filing date: 2009-09-18
Publication date: 2010-08-11
Anticipated expiration: 2019-09-18

Abstract

The utility model relates to a device for preventing the interference caused on a system circuit by ESD. The device comprises a PCB (printed circuit board) and a metal housing; a metal conductor is connected between a ground terminal at a port of the PCB and the metal housing; and magnetic beads are connected between a grounding terminal of an electronic element of the PCB and the ground terminal at the port of the PCB. The utility model has the advantages of simple structure and ideal anti-electrostatic effect.

Description

A kind of device that protects ESD to the circuit system interference

Technical field

The utility model relates to the device that a kind of protection ESD that is used on the electronic product disturbs circuit system.

Background technology

ESD is the abbreviation of English electronstatic discharge, and original meaning is a static discharge, also refers to the protection to static discharge usually; Static and static discharge lose in our daily life nowhere, but concerning electronic device, and once our the slight static discharge that can't discover just may cause serious damage to it.The fast development of electronic technology, allowed electronic product function from strength to strength, volume is but more and more littler, but this all to be electrostatic discharge susceptivity with electronic devices and components more and more higher is cost.This be because, high integrated level means that unit line can be more and more narrow, the ability of tolerance static discharge worse and worse, the employed material of extraordinary device that a large amount of in addition new developments are got up also all is the electrostatic sensitive material, thereby allow electronic devices and components, particularly the semi-conducting material device requires more and more higher for the electrostatic control of process environments such as production, assembling and maintenance.Present electronic products such as multimedia player, expose terminal metal shell (as AV stand shell, HDMI stand shell etc.) in fuselage outside when being subjected to static, electric charge will be easily ground by PCB flow to the Circuits System that move, thereby influence the operate as normal of system; Make and must exist bigger difficulty by ESD test, existing method is varied but all can not obtain good effect.

The utility model content

Based on the deficiencies in the prior art, problem to be solved in the utility model provides the device that a kind of protection ESD that is used on the electronic product disturbs circuit system, and this apparatus structure is simple, the anti-static effect ideal.

For addressing the above problem, the device that the utility model provides a kind of ESD of protection that circuit system is disturbed, it comprises printed circuit board (PCB) and metal shell, is connected with metallic conductor between the earth terminal of described printed circuit board (PCB) port and metal shell.

When each port of printed circuit board (PCB) is subjected to static, the metallic conductor metal shell that can rapidly static be led, and import the earth by external grounding apparatus, thus reduce influence to the printed circuit board (PCB) inside chip.

Particularly, described printed circuit board (PCB) port can be USB port, also can be AV port or HDMI port.Between the earth terminal of the electronic component earth terminal of described printed circuit board (PCB) and described printed circuit board (PCB) port, also be connected with magnetic bead.Even still have partial electrostatic to flow to inside chip by printed circuit board (PCB) like this, but because the isolation of magnetic bead has the certain absorption effect to static, the system that makes avoids the interference of ESD.

Described metallic conductor can be that metal clips or conduction bubble are continuous.

For making the utility model easier to understand, further set forth the utility model below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 protects the device structural representation in one embodiment that ESD disturbs circuit system for the utility model is a kind of;

Fig. 2 protects the circuit connection diagram of ESD to the device middle port ground of circuit system interference for the utility model is a kind of;

Fig. 3 protects the circuit connection diagram of ESD to other ground in the device of circuit system interference for the utility model is a kind of;

Fig. 4 protects ESD to the device middle port ground of circuit system interference and the connection diagram between other ground for the utility model is a kind of.

Embodiment

Description is described embodiment.

On the PCB originally " " fuse, the branch that does not have " port ground " and " other ground ", there is not shell fragment that metal shell is communicated with the ground of PCB yet, so when exposing terminal metal shell (as AV stand shell, HDMI stand shell etc.) in fuselage outside when being subjected to static, electric charge will be easily ground by PCB flow to the Circuits System that move, thereby influence the operate as normal of system.

Referring to figs. 2 and 3, the utility model is cut apart " the port ground " and " other ground " of printed circuit board (PCB), and " port ground " circuit (GND1) that shows USB port, AV port, DC port among Fig. 2 respectively connects situation; Fig. 3 is the connection situation on " other ground "; With all of the port be connected to GND1, other ground are MAIN_GND.

With reference to figure 1, the device that the utility model provides a kind of ESD of protection that circuit system is disturbed, it comprises printed circuit board (PCB) 2 and metal shell 1, is connected with metallic conductor 4 between the earth terminal (being port ground) of described printed circuit board (PCB) port 3 and metal shell 1; This metallic conductor can be that metal clips or conduction bubble are continuous;

When each port 3 of printed circuit board (PCB) is subjected to static, metallic conductor 4 metal shell 1 that can rapidly static be led, and import the earth by external grounding apparatus, thus reduce influence to the printed circuit board (PCB) inside chip.

Particularly, described printed circuit board (PCB) port 3 can be a USB port, also can be AV port or HDMI port or DC port.

With reference to figure 4, between other earth terminals (MAIN_GND) of the earth terminal (port ground GND1) of described printed circuit board (PCB) port and described printed circuit board (PCB), also be connected with magnetic bead.Each port will distribute 1 to 2 magnetic bead, even still have partial electrostatic to flow to inside chip by printed circuit board (PCB) like this, but because the isolation of magnetic bead has the certain absorption effect to static, the system that makes avoids the interference of ESD.

The utility model can effectively prevent the influence to machine of ESD.When each port is subjected to static, the shell fragment metal shell that can rapidly static be led, and metal shell is by HDMI line or AV line or USB line or the like, link to each other with the ground of the peripheral hardware that is connected, and the ground of peripheral hardware generally links to each other with the earth, so electric charge can import the earth by time approach, thereby reduce influence to the chip of PCB inside.Even still have partial electrostatic to flow to inside chip by PCB, but because the isolation of magnetic bead has the certain absorption effect to static, if magnetic bead is selected suitable specification, just can make system avoid the interference of ESD.

Above disclosed only is preferred embodiment of the present utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.

Claims

1. one kind is protected the device that ESD disturbs circuit system, and it comprises printed circuit board (PCB) and metal shell, it is characterized in that, is connected with metallic conductor between the earth terminal of described printed circuit board (PCB) port and metal shell.

2. protection ESD as claimed in claim 1 is characterized in that to the device that circuit system disturbs described printed circuit board (PCB) port is USB port or AV port or HDMI port.

3. protection ESD as claimed in claim 1 is characterized in that the device that circuit system disturbs, is connected with magnetic bead between the electronic component earth terminal of described printed circuit board (PCB) and the earth terminal of described printed circuit board (PCB) port.

4. protection ESD as claimed in claim 1 is characterized in that to the device that circuit system disturbs described metallic conductor is that metal clips or conduction bubble are continuous.

5. protection ESD as claimed in claim 4 is characterized in that to the device that circuit system disturbs described metal clips is welded between the earth terminal and metal shell of described printed circuit board (PCB) port.