CN206932164U

CN206932164U - A kind of new 12V DC port-guard circuit

Info

Publication number: CN206932164U
Application number: CN201720416658.XU
Authority: CN
Inventors: 丁志尧; 邓润庭; 李晓明; 胡德聪
Original assignee: China Certification & Inspection Group Hubei Co Ltd
Current assignee: China Certification & Inspection Group Hubei Co Ltd
Priority date: 2017-04-20
Filing date: 2017-04-20
Publication date: 2018-01-26
Anticipated expiration: 2027-04-20

Abstract

The utility model discloses a kind of new 12V DC port-guard circuit, including 12V DC circuit input end mouth, the positive pole and negative pole of the 12V DC circuit input end mouth over the ground between have additional TVS pipe, TVS pipe includes TVS pipe D1 and TVS pipe D2, the output end of the TVS pipe is electrically connected with electric capacity C1 and electric capacity C2 over the ground, electric capacity C1 and electric capacity C2 output end are electrically connected with common mode inductance L1, the output end that the output end of the common mode inductance L1 is electrically connected with X electric capacity C3 and X electric capacity C4, X electric capacity C3 and X electric capacity C4 is electrically connected to late-class circuit.Filter circuit in this programme can then suppress the emc issue of the power port of product, such as the interference such as conducted emission, radiation-emitting, transient state conducted immunity, transient state conducted emission, electrostatic, surge, impulse train well.

Description

A kind of new 12V DC port-guard circuit

Technical field

The filter design technology field of automobile 12V DC power port is the utility model is related to, specially a kind of new 12V is straight Flow port protection circuit.

Background technology

The electronic device of the various functions such as Electronic Control, communication, navigation, monitoring and the display of 12V DC power supply is a large amount of Automobile Design is applied to, these products may cause electromagnetic hazard during use to the electronic equipment of surrounding, while By electromagnetic interference caused by other vehicle-mounted electrical equipments, the function of electronic installation may be caused to reduce, of short duration failure even forever Damage long.These electromagnetic interferences come from the power supply systems such as ignition system, generator and rectifier, motor and actuator mostly System, can be traveled in vehicle electronics part or system by way of conducting, coupling or radiate, influence its normal operation.Therefore, Defined in ISO 7637-2 along the vulnerability to jamming failure mode of disturbing pulse of the electric transient conduction of power line, the order of severity and Method of testing, standard can have been done defined below to the situation that power interface impacts in the process of moving to automobile：

Pulse 1 is used for caused transient phenomenon when analog power disconnects with inductive load.

Pulse 2a is used to simulate the transient state caused by wire harness inductance makes in the device in parallel with DUT electric current interruption suddenly and showed As.

Pulse 2b is used for after simulating ignition switch disconnection, direct current generator caused transient phenomenon as generator.

Pulse 3a, 3b are the transient phenomenons formed for analog switch process.

The reduction of the supply voltage formed during the starter motor power on circuitry of internal combustion engine is simulated in pulse 4.

Test pulse 5 is simulation throw load transient phenomenon.

These simulation pulse situations in a practical situation be applied to various dynamical systems road vehicle, in order to ensure with Electric equipment normal work, from the electric transient Conduction Interference pulse on power line.

Utility model content

The purpose of this utility model is to provide a kind of new 12V DC port-guard circuit, to solve above-mentioned background skill The problem of being proposed in art.

To achieve the above object, the utility model provides following technical scheme：A kind of new 12V DC port-guard electricity Road, including 12V DC circuit input end mouth, the positive pole and negative pole of the 12V DC circuit input end mouth over the ground between have additional TVS pipe, TVS pipe include TVS pipe D1 and TVS pipe D2, and the output end of the TVS pipe is electrically connected with electric capacity C1 and electric capacity over the ground The output end that C2, electric capacity C1 and electric capacity C2 output end are electrically connected with common mode inductance L1, the common mode inductance L1 is electrically connected with X Electric capacity C3 and X electric capacity C4, X electric capacity C3 and X electric capacity C4 output end is electrically connected to late-class circuit.

Preferably, the TVS pipe D1 connects with TVS pipe D2, electric capacity C1, electric capacity C2 respectively, TVS pipe D2, electric capacity C1, electric capacity C2 is parallel with one another.

Compared with prior art, the beneficial effects of the utility model are：Filter circuit in this programme can then press down well The emc issue of the power port of product processed, such as the conduction of conducted emission, radiation-emitting, transient state conducted immunity, transient state Transmitting, electrostatic, surge, impulse train etc. disturb.

Brief description of the drawings

Fig. 1 is the utility model circuit diagram.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, 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, belong to the scope of the utility model protection.

Referring to Fig. 1, the utility model provides a kind of technical scheme：First in the positive pole and negative pole pair of 12V DC port Increase high-power TVS pipe between ground（Transient voltage suppressor）, TVS pipe includes TVS pipe D1 and the pole of TVS pipe D2, TVS bis- Pipe is highly effective transient interference suppressor part, and when its two poles of the earth is by reverse transient state high energy impact events, it can be with 10-12 s The speed of magnitude, the high impedance of two interpolars is changed into Low ESR, absorbs up to thousands of watts of surge or pulse power, make the two poles of the earth Between voltage clamping in a predetermined value, effectively protect the precision components in electronic circuit from the broken of various surge pulses It is bad.

Because TVS pipe is mainly to suppress the pulse of moment, belong to protection device, it is impossible to it is effective to filter out interference, therefore Also to increase filter circuit after TVS, the output end of the TVS pipe is electrically connected with electric capacity C1 and electric capacity C2 over the ground, due to The interference of input power is mainly generally nF levels to μ F levels in the MHz of hundreds of kHz~tens, capacitor's capacity selection.

Very strong common mode disturbances can be produced between power positive cathode, electric capacity C1 and electric capacity C2 output end are electrically connected with altogether Mould inductance L1, common mode inductance is also common mode choke, inhibited to common mode disturbances, and DM EMI unrestraint is made With.Common mode choke can transmit difference mode signal, and direct current and the very low difference mode signal of frequency can be by, and are total to for high frequency Very big impedance is then presented in mode noise, has played the effect of an impedor, is disturbed so it can be used for suppression common mode.TVS For pipe D1 respectively with TVS pipe D2, electric capacity C1, electric capacity C2 series connection, TVS pipe D2, electric capacity C1, electric capacity C2 are parallel with one another.

After by common mode choke L1, common mode disturbances substantially filter for the interference of power input, but input just DM EMI between negative pole still has, and the output end of the common mode inductance L1 is electrically connected with X electric capacity C3 and X electric capacity C4, X electricity The output end for holding C3 and X electric capacity C4 is electrically connected to late-class circuit, and DM EMI is filtered out using X electric capacity.

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 with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims

1. a kind of new 12V DC port-guard circuit, including 12V DC circuit input end mouth, it is characterised in that：The 12V The positive pole and negative pole of DC circuit input port over the ground between have additional TVS pipe, TVS pipe includes TVS pipe D1 and TVS pipe D2, institute The output end for stating TVS pipe is electrically connected with electric capacity C1 and electric capacity C2 over the ground, and electric capacity C1 and electric capacity C2 output end are electrically connected with The output end for having common mode inductance L1, the common mode inductance L1 is electrically connected with X electric capacity C3 and X electric capacity C4, X electric capacity C3 and X electric capacity C4 Output end be electrically connected to late-class circuit.

A kind of 2. new 12V DC port-guard circuit according to claim 1, it is characterised in that：The TVS pipe D1 points Do not connected with TVS pipe D2, electric capacity C1, electric capacity C2, TVS pipe D2, electric capacity C1, electric capacity C2 are parallel with one another.