CN203352927U

CN203352927U - Static electricity preventing circuit

Info

Publication number: CN203352927U
Application number: CN 201320338640
Authority: CN
Inventors: 陈世松
Original assignee: Inventec Appliances Shanghai Corp; Inventec Appliances Pudong Corp; Inventec Appliances Corp
Current assignee: Inventec Appliances Shanghai Corp; Inventec Appliances Pudong Corp; Inventec Appliances Corp
Priority date: 2013-06-13
Filing date: 2013-06-13
Publication date: 2013-12-18
Anticipated expiration: 2023-06-13

Abstract

The utility model is a static electricity preventing circuit which comprises a casing ground wire, a first circuit board ground wire, a second circuit board ground wire, a resistor and a capacitor. The casing ground wire is electrically connected with a connector on a circuit board, the first circuit board ground wire and the second circuit board ground wire are respectively arranged on the circuit board, one end of the resistor is electrically connected with the casing ground wire, the other end of the resistor is electrically connected with the first circuit board ground wire, one end of the capacitor is electrically connected with the casing ground wire, the other end of the capacitor is electrically connected with the first circuit board ground wire to be in parallel connection with the resistor to form an RC filtering circuit, and the other end of the capacitor is electrically connected with the second circuit board ground wire through a zero ohmic resistor. When an electronic device generates static discharge, most current can be firstly transmitted to the first circuit board ground wire to be filtered, the residual current is transmitted to the second circuit board ground wire, and the system stability of the electronic device in operation is effectively protected.

Description

Static prevents circuit

Technical field

The utility model relates to static and prevents circuit, relate in particular on a kind of electronic installation of the connector that is applied to expose, and the static that is provided with a RC filter circuit between shell ground wire and circuit board ground prevents circuit.

Background technology

Along with extensive use and the electromagnetic environment of microelectric technique becomes increasingly complex, the user more and more payes attention to static discharge (Electrostatic Discharge, abbreviation ESD) Electromagnetic Environmental Effect, the problems that derive, such as: electromagnetic interference (EMI) and Electromagnetic Compatibility etc., wherein static discharge is to cause most electronic building brick or electronic system to be subject to excessively electrically stress (Electrical Overstress, abbreviation EOS) principal element of destroying, mainly be that static is when electric discharge, can produce the electric current of high pressure moment, its representative value is several kilovolts, therefore easily cause electronic building brick to damage because bearing too high electric current.

In general, on the whole the generation reason of static is divided into that friction produces electricity and induction charging, after i.e. Surface Contact friction between two objects that wherein friction produces electricity, because electric charge to each other can rearrange, now will between these objects, electron exchange occur, and then accumulate static on object; Induction charging is that an insulator is at a close charged object, or it is placed between two electrodes and these electrodes while having certain voltage, because insulator itself is non-conductive, and its inner electronics can't move, therefore, the arrangement of molecule will change because of electric field,, certain part positively charged of insulator and other parts are electronegative, to form static; Therefore, when electronic building brick or system and device manufacturing, produce, assembling, test, carrying ... in process, static can be accumulated in human body, instrument, store on equipment and electronic building brick, as people in unwitting situation, after making these objects be in contact with one another, just can form a discharge path, cause static to discharge, now, after the circuit of the electric current of high pressure on the circuit board of flowing through, not only easily cause the circuit shakiness, even can cause electronic building brick breakdown and damage.

Existing electronic installation, for can facilitate the user can be between different electronic installations exchange message, mostly be provided with connector, being connected on other electronic installation by transmission line, the metal shell of the connector of current electronic installation, can be connected to a shell ground wire of circuit board, it is online that this shell ground wire can be connected to by a Zero-ohm resistor circuit board ground usually, again, because the volume of aforementioned connector is larger, and usually can expose to outside electronic installation, therefore, easily accumulate a large amount of static thereon, secondly, because the current rise time of static discharge is very short, for example: common human body electric discharge, can be shorter than 10 how second (ns) its current rise time, therefore, the electrostatic induced current imported into via connector can be promptly via the shell ground wire, flow through after this Zero-ohm resistor, arrive circuit board ground, now, suddenly the circuit running on the as easy as rolling off a log interfered circuit plate of the electric current increased, and then cause the System Operation shakiness with electronic installation, the facts of electronic installation even may be damaged.

Known in sum; there is the electronic installation that exposes connector; usually can be more responsive to static discharge; cause the running shakiness of electronic installation or damage, so, how for aforementioned disappearance; design a kind of static and prevent circuit; to be applied on aforementioned electronic, and solve the harmful effect that static discharge produces electronic installation, become relevant practitioner's important topic.

The utility model content

Because the user is when carrying out the part network service; disappearance on online safety is still arranged; so; utility model people is through the permanent research and experiment of making great efforts; finally development and Design goes out a kind of networking methods that possesses the Dynamic Establishing special line and block non-special line ability of the present utility model; to the user can be provided by the utility model a kind of network connecting mode that has more protectiveness, and the practitioner can, in the existing network market, be occupied a tiny space.

A purpose of the present utility model, be to provide a kind of static and prevent circuit, be applied to have on the electronic installation that exposes connector, the electrostatic induced current of being accumulated reducing on connector, the harmful effect caused for electronic installation, this static prevents that circuit is provided with a shell ground wire on a circuit board, one first circuit board ground wire, one second circuit board ground wire, one resistance and an electric capacity, wherein when a connector is assembled to this circuit board, this shell ground wire can be electrically connected mutually with this connector, again, this first circuit board ground wire and second circuit board ground wire are arranged at respectively on the circuit board in electronic installation, separately, one end of this resistance is electrically connected to this shell ground wire, its other end is electrically connected to this first circuit board ground wire, one end of this electric capacity is electrically connected to this shell ground wire, its other end is electrically connected to this first circuit board ground wire, to be in parallel with this resistance, to form a RC filter circuit, again, the other end of this electric capacity also is electrically connected to this second circuit board ground wire via a Zero-ohm resistor, when this electronic installation generation static discharge, the electric current produced can transfer to this shell ground wire via this connector, this electric current can first be processed through the filtering of this RC filter circuit, and by most current delivery to the first circuit board ground wire, its aftercurrent just transfers to the second circuit board ground wire via this Zero-ohm resistor, so, the rise time of the electric current produced due to static discharge is very short, therefore after the delay effect through this RC filter circuit, just can reduce significantly the impact on the integrated circuit of this electronic installation of electric current that static discharge produces, effectively protect the stability of a system of this electronic installation when running.

Your juror can do understanding and understanding further to the utility model purpose, technical characterictic and effect thereof for ease of, hereby for embodiment, to coordinate Figure of description, be described in detail as follows:

The accompanying drawing explanation

Fig. 1 is the circuit diagram that static of the present utility model prevents circuit; And

Fig. 2 is the circuit board schematic diagram that static of the present utility model prevents circuit.

[primary clustering symbol description]

Static prevents circuit ... 1

The shell ground wire ... 11

The first circuit board ground wire ... 13

The second circuit board ground wire ... 15

Circuit board ... 2

Connector ... 21

Resistance ... R

Zero-ohm resistor ... R0

Electric capacity ... C

Electric current ... I, I1, I2

Embodiment

The utility model is that a kind of static prevents circuit, be applied to have on the electronic installation of the connector exposed, due to static discharge (Electrostatic Discharge, abbreviation ESD) current rise time is very short, therefore, utility model people is especially for afore-mentioned characteristics, set up a static and prevent circuit on the circuit of original circuit board, enter the time of the circuit of circuit board to delay electrostatic induced current, the impact of reduction on original circuit, refer to shown in Fig. 1 and Fig. 2, wherein Fig. 1 is the circuit diagram that static prevents circuit 1, Fig. 2 is the schematic diagram of side circuit plate, in one embodiment, this static prevents that circuit 1 from comprising a shell ground wire 11, one first circuit board ground wire 13, one second circuit board ground wire 15, one resistance R and a capacitor C, when wherein circuit board 2 is on being assembled to electronic installation (as: mobile phone), connector 21 on circuit board 2 can contact with the shell of electronic installation, simultaneously, this shell ground wire 11 on this circuit board 2 can be by this connector 21, with the shell of this electronic installation, be electrically connected mutually, the electrostatic induced current that makes this connector 21 or shell accumulate can flow into this shell ground wire 11.

Hold, please consult again shown in Fig. 1 and Fig. 2, 15 of this first circuit board ground wire 13 and second circuit board ground wires are arranged at respectively on the circuit board 2 in electronic installation, an and apart distance, wherein this first circuit board ground wire 13 is between this shell ground wire 11 and second circuit board ground wire 15, after making the electrostatic induced current that flows into this shell ground wire 11 to flow in advance first circuit board ground wire 13, flow into again second circuit board ground wire 15, separately, one end of this resistance R is electrically connected to this shell ground wire 11, its other end is electrically connected to this first circuit board ground wire 13, one end of this capacitor C is electrically connected to this shell ground wire 11, its other end is electrically connected to this first circuit board ground wire 13, to be in parallel with this resistance R, to form a RC filter circuit, in this embodiment, this resistance R can be 33 ohm (ohm), capacitor C can be 33 farads (pf), again, in other embodiment of the present utility model, non-only as limit, the practitioner can be according to implementing product demand, and the numerical value of adjusting resistance R and capacitor C voluntarily.

Again, please consult again shown in Fig. 1 and Fig. 2, the other end of this capacitor C also is electrically connected to this second circuit board ground wire 15 via a Zero-ohm resistor R0, please consult again shown in Fig. 2, when this electronic installation generation static discharge, the electric current I produced can transfer to this shell ground wire 11 via this connector 21, this electric current I can first be processed through the filtering of this RC filter circuit, make the electric current of the major part in this electric current I can transfer to first circuit board ground wire 11(, electric current I 1), and after after a while, its aftercurrent just can transfer to second circuit board ground wire 15(via this Zero-ohm resistor R0, electric current I 2), , this RC filter circuit can produce a delay effect to this electric current I, just as aforementioned, because the current rise time of static discharge is very short, therefore, delay effect by the RC filter circuit, current rise time can be spent by making the electric current I 2 that flows into second circuit board ground wire 15, and form the electric current of non-high pressure, so can reduce significantly the impact on the integrated circuit of this circuit board 2 of electric current I 2 that static discharge produces, and then effectively protect this electronic installation in the stability of a system in when running.

The above; be only a preferred embodiment of the present utility model, technical characterictic of the present utility model is not limited to this, and the personage of all correlative technology fields is after considering technology contents of the present utility model in light of actual conditions; can think easily and equivalence change, all should not break away from protection category of the present utility model.

Claims

1. a static prevents circuit, is applied to have on the electronic installation of a connector exposed, and it is characterized in that, comprising:

One shell ground wire, be arranged on the circuit board in this electronic installation, with by this connector, with a housing of this electronic installation, is electrically connected mutually;

One first circuit board ground wire, be arranged on this circuit board, and with this shell ground wire spacing of being separated by;

One second circuit board ground wire, be arranged on this circuit board, and with this shell ground wire and this first circuit board ground wire spacing of being separated by;

One resistance, the one end is electrically connected to this shell ground wire, and its other end is electrically connected to this first circuit board ground wire; And

One electric capacity, the one end is electrically connected to this shell ground wire, and its other end is electrically connected to this first circuit board ground wire, to be in parallel with this resistance, to form a RC filter circuit, the other end of this electric capacity, also via a Zero-ohm resistor, is electrically connected to this second circuit board ground wire.

2. static as claimed in claim 1 prevents circuit, it is characterized in that, wherein this first circuit board ground wire is between this shell ground wire and this second circuit board ground wire.