CN204497232U

CN204497232U - ESD safeguard structure in PCB circuit

Info

Publication number: CN204497232U
Application number: CN201520079019.XU
Authority: CN
Inventors: 付辉辉
Original assignee: Chongqing Blue Bank Communication Technology Co Ltd
Current assignee: Chongqing Lanan Technology Co ltd
Priority date: 2015-02-04
Filing date: 2015-02-04
Publication date: 2015-07-22
Anticipated expiration: 2025-02-04

Abstract

The utility model discloses the ESD safeguard structure in a kind of PCB circuit, comprise the first wiring pin be connected with holding wire and the second wiring pin be connected with ground wire, it is characterized in that: described first wiring pin and described second wiring pin are one group of symmetrical isosceles triangle, and the drift angle of the first wiring pin is just to the drift angle of the second wiring pin, the mid point on the first wiring pin base connects described holding wire, the mid point on the second wiring pin base connects described ground wire.Its effect is: do not use independent electrostatic protection device, and directly improve the pad structure in PCB circuit, reached the object of ESD protection by point discharge, circuit design is convenient, and system reliability is stronger.

Description

ESD safeguard structure in PCB circuit

Technical field

The utility model relates to PCB (Printed Circuit Board, printed circuit board) electrostatic defending technology in circuit, specifically, be ESD (Electro-Static discharge, Electro-static Driven Comb) safeguard structure in a kind of PCB circuit.

Background technology

In PCB circuit, ESD usually causes electronic failure or misoperation, when situation is serious, even punctures integrated circuit and other precision electronic element.

Conventional ESD guard technology as depicted in figs. 1 and 2, electrostatic protection device in parallel (as TVS pipe, piezo-resistance) on the holding wire of interface signal introducing integrated chip, when holding wire existing moment high energy impact events, the impedance of electrostatic protection device reduces suddenly, simultaneously stability big current, the voltage clamping at its two ends is numerically predetermined at one, thus ensure that integrated chip is without prejudice.

Its defect existed is: need dress to paste independently electrostatic protection device during circuit design, add circuit cost, aging along with device, and ESD protection effect is by adversely effected, and system reliability is not high.

Utility model content

For the deficiencies in the prior art, the utility model provides the ESD safeguard structure in a kind of PCB circuit, by improving the pad structure in PCB circuit, making it not need dress to paste independently electrostatic protection device, utilizing pad tip to discharge to realize ESD over the ground and protecting object.

For achieving the above object, the concrete technical scheme that the utility model adopts is as follows:

ESD safeguard structure in a kind of PCB circuit, comprise the first wiring pin be connected with holding wire and the second wiring pin be connected with ground wire, its key is: described first wiring pin and described second wiring pin are one group of symmetrical isosceles triangle, and the drift angle of the first wiring pin is just to the drift angle of the second wiring pin, the mid point on the first wiring pin base connects described holding wire, the mid point on the second wiring pin base connects described ground wire.

Based on above-mentioned improvement, this programme directly utilizes the tip of the first wiring pin to discharge to reach ESD over the ground and protects object, do not need using two wiring pins as pad to weld independent electrostatic protection device, thus avoid impacting system ESD protection effect because electrostatic protection device is aging.

As further describing, described first wiring pin and described second wiring pin are made up of the copper that covers in PCB substrate, can be printed shaping by circuit, make it process and design convenient.

In order to size requirements during combined circuit layout, ensure point discharge effect simultaneously, the base length of described first wiring pin and described second wiring pin is 0.3603mm, base angle angle is 50 °, distance between first wiring pin and the second wiring pin two drift angle is 0.0457mm, for existing rectangular pads structure, reduce circuit area.

Remarkable result of the present utility model is: do not use independent electrostatic protection device, and directly improve the pad structure in PCB circuit, reached the object of ESD protection by point discharge, circuit design is convenient, and system reliability is stronger.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of existing ESD guard technology;

Fig. 2 is the structural representation of wiring pin in Fig. 1;

Fig. 3 is the circuit theory diagrams of the utility model ESD guard technology;

Fig. 4 is the structural representation of wiring pin in Fig. 3.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model and operation principle are described in further detail.

As Figure 3-Figure 4, ESD safeguard structure in a kind of PCB circuit, comprise the first wiring pin be connected with holding wire and the second wiring pin be connected with ground wire (being labeled as No. 1 pin and No. 2 pins in figure respectively), described first wiring pin and described second wiring pin are one group of symmetrical isosceles triangle, and the drift angle of the first wiring pin is just to the drift angle of the second wiring pin, the mid point on the first wiring pin base connects described holding wire, the mid point on the second wiring pin base connects described ground wire.

In the present embodiment, described first wiring pin and described second wiring pin are made up of the copper that covers in PCB substrate.

It can also be seen that from Fig. 4, the base length of described first wiring pin and described second wiring pin is 0.3603mm, and base angle angle is 50 °, and the distance between the first wiring pin and the second wiring pin two drift angle is 0.0457mm.

Operation principle of the present utility model is:

This programme changes original rectangular pads for welding electrostatic protection device into isosceles triangle; when interface signal line producing electrostatic; the high impulse of moment realizes Electro-static Driven Comb by leg-of-mutton tip; do not need additional independent electrostatic protection device; utilize pad body can realize ESD protection, effectively ensure that follow-up chip is injury-free.

Finally it should be noted that; the present embodiment is only described preferred embodiment of the present utility model; be not limited to the execution mode of Figure of description indication; those of ordinary skill in the art is under enlightenment of the present utility model; under the prerequisite without prejudice to the utility model aim and claim; can make like multiple types and representing; size such as the first wiring pin and the second wiring pin adjusts; improve the electric conducting material of the first wiring pin and the second wiring pin, such conversion all falls within the utility model protection range.

Claims

1. the ESD safeguard structure in a PCB circuit, comprise the first wiring pin be connected with holding wire and the second wiring pin be connected with ground wire, it is characterized in that: described first wiring pin and described second wiring pin are one group of symmetrical isosceles triangle, and the drift angle of the first wiring pin is just to the drift angle of the second wiring pin, the mid point on the first wiring pin base connects described holding wire, the mid point on the second wiring pin base connects described ground wire.

2. the ESD safeguard structure in PCB circuit according to claim 1, is characterized in that: described first wiring pin and described second wiring pin are made up of the copper that covers in PCB substrate.

3. the ESD safeguard structure in PCB circuit according to claim 1 and 2, it is characterized in that: the base length of described first wiring pin and described second wiring pin is 0.3603mm, base angle angle is 50 °, and the distance between the first wiring pin and the second wiring pin two drift angle is 0.0457mm.