CN206452537U

CN206452537U - A kind of voicefrequency circuit of anti-static electricity interference

Info

Publication number: CN206452537U
Application number: CN201720206511.8U
Authority: CN
Inventors: 杨达明
Original assignee: Enping Aoda Electronic Technology Co Ltd
Current assignee: Enping Aoda Electronic Technology Co Ltd
Priority date: 2017-03-06
Filing date: 2017-03-06
Publication date: 2017-08-29
Anticipated expiration: 2027-03-06

Abstract

The utility model discloses a kind of voicefrequency circuit of anti-static electricity interference of voicefrequency circuit technical field, including ESD inputs, the ESD inputs concatenation impedance Z, the impedance Z is simultaneously connected to discharge device EP, it is two-way to hit two grades of poling D1, it is two-way to hit two grades of poling D2, electric capacity C1, electric capacity C2 and No. 2 ports by protection voicefrequency circuit AFC, the design produces area by ESD input contact electrostatic, discharge current is limited using the impedance Z of series connection, discharge device EP in parallel absorbs the surge on power supply and improves high-voltage resistance capability, again two grades of poling D1 are hit by two-way, it is two-way to hit two grades of poling D2, electric capacity C1 and electric capacity C2 parallel connection, limit electric current, electrostatic interference is effectively eliminated, optimize systematic function, improve the reliability of whole system, on design is realized, it is simple and easy to apply.

Description

A kind of voicefrequency circuit of anti-static electricity interference

Technical field

The utility model is related to voicefrequency circuit technical field, specially a kind of voicefrequency circuit of anti-static electricity interference.

Background technology

Current mobile phone is used in the environment of cold, dry weather, air-conditioning or carpet, due to easily being influenceed by electrostatic, The problems such as voicefrequency circuit failure and interruption is easily caused, electrostatic problem can not only bring influence to user, can also make product can not By the technical standard of the Electro Magnetic Compatibility of the electronic product of national regulation, and product is set to cannot be introduced into market sale.Electrostatic is put Electricity is, by two objects with different electrostatic potentials, the electrostatic between two articles to be caused due to direct contact or electrostatic induction etc. Electric charge transfer, after static electric field reaches to a certain degree, the phenomenon for puncturing its medium and being discharged, therefore, I proposes that one kind is anti- The voicefrequency circuit of electrostatic interference.

Utility model content

The purpose of this utility model is to provide a kind of voicefrequency circuit of anti-static electricity interference, to solve in above-mentioned background technology The problem of voicefrequency circuit failure that the electrostatic of proposition is caused is with interrupting.

To achieve the above object, the utility model provides following technical scheme：A kind of voicefrequency circuit of anti-static electricity interference, bag Include ESD inputs, ESD input concatenation impedance Z, the impedance Z and be connected to discharge device EP, it is two-way hit two grades of poling D1, it is double To two grades of poling D2, electric capacity C1, electric capacity C2 and No. 2 ports by protection voicefrequency circuit AFC are hit, the discharge device EP's is another Hold and be connected to it is two-way hit two grades of poling D1 other ends, it is two-way that to hit two grades of poling D2 other ends, the electric capacity C1 other ends, electric capacity C2 another End, by protection voicefrequency circuit AFC No. 3 ports and ground wire, it is described that filtering is serially connected with by protection voicefrequency circuit AFC No. 1 port Circuit RC, the filter circuit RC concatenations VCC inputs.

It is preferred that, the impedance Z is BGL types magnetic bead or piezo-resistance.

It is preferred that, the discharge device EP is TVS or gas-discharge tube.

It is preferred that, the filter circuit RC includes input port A, the input port A series resistors R1, the resistance R1 And electric capacity C3, resistance R2 and output port B are connected to, the other end of the electric capacity C3 and resistance R2 are grounded.

Compared with prior art, the beneficial effects of the utility model are：Resist for the audio chip of the electrical equipments such as mobile phone Electrostatic capacity is weaker, in the case that common protection Design can not meet testing standard, and the design is quiet by ESD input contacts Electricity produces area, and discharge current is limited using the impedance Z of series connection, and discharge device EP in parallel absorbs the surge on power supply and improved resistance to High pressure ability, then hit two grades of poling D1, the two-way parallel connection for hitting two grades of poling D2, electric capacity C1 and electric capacity C2, limitation electricity by two-way Stream, has effectively eliminated electrostatic interference, has optimized systematic function, improved the reliability of whole system, on design is realized, letter It is single easy.

Brief description of the drawings

Fig. 1 is the utility model circuit diagram；

Fig. 2 is the utility model filter circuit figure.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belongs to the scope of the utility model protection.

Fig. 1-2 is referred to, the utility model provides a kind of technical scheme：A kind of voicefrequency circuit of anti-static electricity interference, including ESD is inputted, ESD input concatenation impedance Z, the impedance Z and be connected to discharge device EP, it is two-way hit two grades of poling D1, it is two-way Hit two grades of poling D2, electric capacity C1, electric capacity C2 and No. 2 ports by protection voicefrequency circuit AFC, the other end of the discharge device EP And be connected to it is two-way hit two grades of poling D1 other ends, it is two-way that to hit two grades of poling D2 other ends, the electric capacity C1 other ends, electric capacity C2 another End, by protection voicefrequency circuit AFC No. 3 ports and ground wire, it is described that filtering is serially connected with by protection voicefrequency circuit AFC No. 1 port Circuit RC, the filter circuit RC concatenations VCC inputs.

Wherein, the impedance Z is BGL types magnetic bead or piezo-resistance, and the BGL types magnetic bead or piezo-resistance of series connection can be limited Discharge current, and cost is relatively low, and the discharge device EP is TVS or gas-discharge tube, and gas-discharge tube can absorb power supply On surge；TVS can improve high-voltage resistance capability, and the filter circuit RC includes input port A, the input port A concatenations Resistance R1, the resistance R1 are simultaneously connected to electric capacity C3, resistance R2 and output port B, and the other end of the electric capacity C3 and resistance R2 are equal Ground connection.

Operation principle：The design produces area by ESD input contact electrostatic, and discharge current is limited using the impedance Z of series connection, Discharge device EP in parallel absorbs the surge on power supply and improves high-voltage resistance capability, then by it is two-way hit two grades of poling D1, it is two-way Two grades of poling D2, electric capacity C1 and electric capacity C2 parallel connection are hit, electric current is limited, has effectively eliminated electrostatic interference, passed through filter circuit RC filter off input signal ripple, using discharge device EP, it is two-way hit two grades of poling D1, it is two-way hit two grades of poling D2, electric capacity C1, Electric capacity C2 and the ground connection by protection voicefrequency circuit AFC No. 3 ports, release current.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.

Claims

1. a kind of voicefrequency circuit of anti-static electricity interference, including ESD inputs, it is characterised in that：The ESD inputs concatenation impedance Z, institute State impedance Z and be connected to discharge device EP, two-way hit two grades of poling D1, two-way hit two grades of poling D2, electric capacity C1, electric capacity C2 and protected Protect voicefrequency circuit AFC No. 2 ports, the other end of the discharge device EP and be connected to it is two-way hit two grades of poling D1 other ends, it is double To hit two grades of poling D2 other ends, the electric capacity C1 other ends, the electric capacity C2 other ends, by protection voicefrequency circuit AFC No. 3 ports and ground Line, it is described that filter circuit RC, the filter circuit RC concatenations VCC inputs are serially connected with by protection voicefrequency circuit AFC No. 1 port.

2. a kind of voicefrequency circuit of anti-static electricity interference according to claim 1, it is characterised in that：The impedance Z is BGL types Magnetic bead or piezo-resistance.

3. a kind of voicefrequency circuit of anti-static electricity interference according to claim 1, it is characterised in that：The discharge device EP is TVS or gas-discharge tube.

4. a kind of voicefrequency circuit of anti-static electricity interference according to claim 1, it is characterised in that：The filter circuit RC bags Include input port A, the input port A series resistors R1, the resistance R1 and be connected to electric capacity C3, resistance R2 and output port B, The other end of the electric capacity C3 and resistance R2 are grounded.