CN106954338B

CN106954338B - Mainboard anti-interference circuit

Info

Publication number: CN106954338B
Application number: CN201710312250.2A
Authority: CN
Inventors: 林世明; 林俊峰
Original assignee: Hengonda Technology Co ltd
Current assignee: Hengonda Technology Co ltd
Priority date: 2017-05-05
Filing date: 2017-05-05
Publication date: 2023-03-14
Anticipated expiration: 2037-05-05
Also published as: CN106954338A

Abstract

The invention provides a mainboard anti-interference circuit, which comprises a mainboard, wherein at least one protection circuit module, at least one interference guide wire and at least one diode are arranged on the mainboard, at least one signal line which is easy to interfere is connected to the protection circuit module, the interference guide wire is arranged in an area which is easy to interfere on the mainboard, the front end of the interference guide wire is connected to the tail end of the interference guide wire to form a closed surrounding space, the protection circuit module and the signal line which is easy to interfere are positioned in the surrounding space, the interference guide wire is connected with the anode of the diode through a connecting wire, and the cathode of the diode is connected with a power ground through the connecting wire; the interference guide wire is provided with at least one solder-resisting window, solder is filled in the solder-resisting window, and the trend of the solder-resisting window is consistent with that of the interference guide wire. The invention adds an interference guide wire and a one-way diode to isolate interference signals so as to achieve the purpose of interference resistance.

Description

Mainboard anti-jamming circuit

Technical Field

The invention relates to the technical field of computers, in particular to a mainboard anti-interference circuit.

Background

Along with the functions of various electronic products are more and more powerful, the circuit board is more and more small, the chip process is improved, the integration level is continuously improved, the protection performance is not correspondingly improved, the early design is still used, along with the improvement of the I/O speed, most I/O ports are driven in the MOS tube mode, the protection capability is weaker, and in the working period of the mainboard, if the routing is subjected to external interference (such as air contact or probe detection), the working abnormality of the mainboard and the detection of data or the influence of the external interference cause the abnormal working of the mainboard.

The anti-interference design of present mainboard adopts the form that the surperficial large tracts of land was spread or the line was walked and is not walked the top layer to realize the anti-interference of mainboard when PCB wiring design. This kind of mode can waste the space, need link all ground moreover, in case produce interfering signal on the mainboard, the trend of interfering signal is irregular, can influence the normal work of mainboard, and the interference on the mainboard is also difficult to eliminate, and the interference killing feature is poor.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide an anti-interference circuit for a motherboard, which has different grounding modes for interference signals, and adds an interference guide wire and a unidirectional diode to isolate the interference signals, so as to achieve the purpose of anti-interference.

The invention is realized by the following steps:

a mainboard anti-interference circuit comprises a mainboard, wherein at least one protection circuit module, at least one interference guide wire and at least one diode are arranged on the mainboard, at least one easily interfered signal line is connected to the protection circuit module, the interference guide wire is arranged in an easily interfered area on the mainboard, the front end of the interference guide wire is connected to the tail end of the interference guide wire to form a closed surrounding space, the protection circuit module and the easily interfered signal line are located in the surrounding space, the interference guide wire is connected with the anode of the diode through a connecting wire, and the cathode of the diode is connected with a power ground through the connecting wire; the interference guide wire is provided with at least one solder-resisting window, solder is filled in the solder-resisting window, and the trend of the solder-resisting window is consistent with that of the interference guide wire.

Furthermore, the mainboard is a PCBA circuit mainboard or an FPC flexible circuit mainboard.

Further, the cross section of the solder mask window is square, circular or oval.

Furthermore, when a plurality of solder-resisting windows are arranged on one interference guide line, the plurality of solder-resisting windows are arranged at equal intervals.

The invention has the advantages that: the invention can not only shield electromagnetic interference and help to improve signal quality, but also improve the anti-interference capability when the mainboard is in error contact in the electrifying process, namely, if a hand or an interference source is in error contact with the mainboard in the working process of the mainboard, an interference guide line on the mainboard can timely guide an interference signal to a power supply ground through a specified path, thereby ensuring the continuous and stable work of the mainboard.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an anti-interference circuit of a motherboard according to the present invention.

Fig. 2 is a schematic structural diagram of a first embodiment of an anti-jamming circuit for a motherboard according to the present invention.

Fig. 3 is a schematic structural diagram of a second embodiment of the motherboard anti-jamming circuit according to the present invention.

The numbering in the figures illustrates:

100-mainboard, 1-protection circuit module, 2-interference guide wire, 3-diode, 4-interference-susceptible signal wire, 5-enclosure space, 6-connecting wire, 7-resistance welding window and 8-welding material.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the structure of the present invention is not limited to the examples.

As shown in fig. 1, the anti-interference circuit for a motherboard of the present invention includes a motherboard 100, where the motherboard 100 is a PCBA circuit motherboard or an FPC flexible circuit motherboard; at least one protection circuit module 1, at least one interference guide line 2 and at least one diode 3 are arranged on the motherboard 100, at least one easily interfered signal line 4 is connected to the protection circuit module 1, the interference guide line 2 is arranged in an easily interfered area on the motherboard 100, the easily interfered area is generally an area with small impedance, high-frequency components of digital signals are easily radiated out in the form of undesired electromagnetic fields through different conductors on the motherboard 100, the electromagnetic fields are also called electromagnetic interference (EMI), a high-frequency circuit generates a large amount of electromagnetic interference, the electromagnetic interference propagates along a path with minimum impedance, namely, an interference source propagates along the interference guide line 2, the front end of the interference guide line 2 is connected to the tail end of the interference guide line 2 to form a closed surrounding space 5, the protection circuit module 1 and the easily interfered signal line 4 are positioned in the surrounding space 5, the interference guide line 2 is connected with the anode of the diode 3 through a connecting line 6, and the cathode of the diode 3 is connected with a power ground through the connecting line 6; the interference guide wire 2 is provided with at least one solder mask window 7, solder 8 is filled in the solder mask window 7, the direction of the solder mask window 7 is consistent with that of the interference guide wire 2, the function is to provide a path to guide an interference signal to the position of the solder mask window 7, so that the leading-in path of the interference signal is controlled, the interference signal is prevented from being led into the signal wire 4 which is easy to be interfered, and the cross section of the solder mask window 7 is square, circular or elliptical; the more the quantity of resistance welding windowing 7, the stronger the anti-interference ability, one set up the plural number on the interference guide wire 2 when hindering the windowing 7, the plural number hinders the equidistant setting of windowing 7, improves guide efficiency.

The first embodiment is as follows:

this scheme is mainly through a new line design and PCB design mode promote mainboard interference killing feature. A PCB design schematic diagram of a single protection circuit module 1 is shown in fig. 2, where the protection circuit module 1 is an integrated circuit chip, such as an earphone socket JP1 (model PJ _ 392), a first port of the earphone socket JP1 is grounded, a second port of the earphone socket JP1 is connected with a right channel output signal line ROUT, a fourth port of the earphone socket JP1 is connected with a left channel output signal line LOUT, a sixth port of the earphone socket JP1 is connected with a composite video broadcast signal line CVBS _ OUT, the right channel output signal line ROUT, the left channel output signal line LOUT and the composite video broadcast signal line CVBS _ OUT are susceptible interference signal lines 4, and the signal is a signal to be protected;

the interference guide LINE 2 (GND _ LINE) surrounds the interference-susceptible signal LINE 4, and surrounds and protects the interference-susceptible signal LINE 4 (the right channel output signal LINE ROUT, the left channel output signal LINE LOUT, and the composite video broadcast signal LINE CVBS _ OUT). When the interference signal is generated, because the interference guide wire 2 is positioned in the area with the minimum impedance, the interference guide wire 2 and the solder resisting window 7 can guide the interference signal to be guided directionally, travel along the route of the interference guide wire 2 and lead to the power ground through 2 unidirectional diodes (D1, D2).

Example two:

this scheme is mainly through a new line design and PCB design mode promote mainboard interference killing feature. A PCB design schematic diagram of n (n is more than or equal to 1) protection circuit modules is shown in FIG. 3, wherein the protection circuit module 1 is a circuit module or an analog signal generator consisting of an integrated circuit chip and an external device; the n (n is more than or equal to 1) protection circuit modules are correspondingly connected with key signal lines 1-n (n is more than or equal to 1), the key signal lines 1-n (n is more than or equal to 1) are easily interfered signals, and the signals are signals needing protection.

In the embodiment, 4 groups of protection circuit modules (protection circuit module 1-1, protection circuit module 1-2, protection circuit module 1-3, and protection circuit module 1-4) are arranged, 4 groups of key signal lines (key signal line 4-1, key signal line 4-2, key signal line 4-3, and key signal line 4-4) need to be protected correspondingly, and interference signals are guided to the optimal grounding holes of the main board 100 through the protection circuit module 1 (the optimal grounding position of each main board 100 is different in actual design and needs to be adjusted according to actual conditions), so that an anti-interference design is achieved. When the interference signal is generated, because the interference guide wire 2 is located in the area with the minimum impedance, the interference guide wire 2 and the anti-welding windowing window 7 can guide the interference signal to be guided directionally, walk along the route of the interference guide wire 2 and lead to the power ground through 4 unidirectional diodes 3 (D1, D2, D3, D4).

The working principle of the invention is as follows:

this scheme promotes mainboard interference killing feature through a new line design and PCB design mode, promotes the protective capacities to easily receiving interference signal line. The invention adds n (n is more than or equal to 1) protection circuit modules 1 on the principle design of a mainboard 100, specifically, each protection circuit module 1 is decomposed on the design, an interference guide wire 2 is added, and a power ground (grounding) is connected in a one-way mode through a diode 3 to realize the control of an interference signal release path, the interference guide wire 2 surrounds a signal line which is easy to be interfered, a resistance welding opening window 7 is arranged on the upper portion of the interference guide wire 2 at the same time, an external interference signal is guided in a directional mode, the interference guide wire 2 is connected with the power ground in a one-way mode through at least one diode 3, the effect of guiding the direction of the interference signal in a one-way mode is achieved, and meanwhile, interference on the power ground is prevented from being stringed on the interference guide wire 2. The interference guide wire 2 is used for guiding and absorbing interference signals, so that the purpose of interference resistance is achieved.

The invention has the following advantages:

the invention can not only shield electromagnetic interference and help signal quality improvement, but also improve the anti-interference capability when the mainboard is in error contact in the power-on process, namely, if a hand or an interference source is in error contact with the mainboard in the working process of the mainboard, an interference guide line on the mainboard can guide an interference signal to a power supply ground in time through a specified path, thereby ensuring the continuous and stable working of the mainboard.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims

1. An anti-jamming circuit of a motherboard, comprising: the circuit protection device comprises a mainboard, wherein at least one protection circuit module, at least one interference guide line and at least one diode are arranged on the mainboard, at least one easily interfered signal line is connected to the protection circuit module, the interference guide line is arranged in an easily interfered area on the mainboard, the front end of the interference guide line is connected to the tail end of the interference guide line to form a closed surrounding space, the protection circuit module and the easily interfered signal line are positioned in the surrounding space, the interference guide line is connected with the anode of the diode through a connecting wire, and the cathode of the diode is connected with a power ground through the connecting wire; the interference guide line is provided with at least one solder mask window, solder is filled in the solder mask window, and the direction of the solder mask window is consistent with that of the interference guide line;

the cross section of the solder mask windowing is square, circular or oval;

when a plurality of resistance welding windows are arranged on one interference guide line, the plurality of resistance welding windows are arranged at equal intervals.

2. The motherboard tamper resistant circuit of claim 1, wherein: the mainboard is a PCBA circuit mainboard or an FPC flexible circuit mainboard.