CN105790230A - Anti-interference method of anti-EFT interference circuit - Google Patents
Anti-interference method of anti-EFT interference circuit Download PDFInfo
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- CN105790230A CN105790230A CN201410790258.6A CN201410790258A CN105790230A CN 105790230 A CN105790230 A CN 105790230A CN 201410790258 A CN201410790258 A CN 201410790258A CN 105790230 A CN105790230 A CN 105790230A
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Abstract
The invention discloses an anti-interference method of an anti-EFT interference circuit. The anti-EFT interference circuit comprises a power module, a sampling unit, an interrupt signal generation unit and a master control module, wherein the master control module is used for controlling external equipment; the sampling unit is connected to an output end of the power module in parallel; and the anti-interference method comprises the steps as follows: (1) the sampling unit collects whether a pulse interference signal exists in the power module or not in real time, and if the pulse interference signal is not collected, the master control equipment controls the external equipment to normally work; (2) if the pulse interference signal is collected, the interrupt signal generation unit generates an interrupt signal and transfers the interrupt signal to the master control module and an interrupt program of the master control module is located on an interference sign to shield the external equipment; and (3) when the pulse interference signal disappears, the interrupt program of the master control module is terminated and the external equipment restores normal work. The anti-interference method disclosed by the invention is safe and reliable; and the condition that an electronic product stably works can be ensured.
Description
Technical field
The present invention relates to electronic product anti-disturbance method, particularly relate to a kind of anti-EFT and disturb the anti-interference method of circuit.
Background technology
Electronic product is in actual use, owing to power grid environment exists various noise, opening and closing such as main equipment on and off switch, all kinds of Switching Power Supply start and stop, electrical network all can be produced various Conduction Interference by the factors such as even outside thunder-strike phenomenon, and then the electronic product in circuit and other equipment are produced interference effect, cause that electronic product there will be the situation that dysfunction is even lost.
Anti-EFT conflicting mode conventional at present is to arrange some anti-interference components and parts in circuit and optimize PCB placement-and-routing, this method to a certain degree can improve the anti-EFT performance of electronic product in Shangdi, but along with the anti-interference class requirement of electronic product increases, the needs of reality only can not be met by aforesaid way.Particularly when occurring serious power supply instantaneous disturbance in circuit, even if the wiring of PCB reaches optimum, and adding some anti-interference components and parts, the Sensitive Apparatus in circuit still can be interfered, and produces abnormal response.
Therefore, a kind of anti-EFT is needed to disturb the anti-interference method of circuit, equipment can be made more directly effectively to detect and resist all kinds of power environment noise jamming, without relying on electronic circuit placement-and-routing, increase anti-interference components and parts etc., it is ensured that product can work in the power environment have environment noise normal table.
Summary of the invention
In view of this, it is an object of the invention to overcome defect of the prior art, a kind of anti-EFT is provided to disturb the anti-interference method of circuit, the method is without relying on electronic circuit placement-and-routing or increasing anti-interference components and parts, it is ensured that electronic product works in the power environment of certain environment noise normal table.
Anti-EFT provided by the invention disturbs the anti-interference method of circuit, described anti-EFT disturbs circuit to include power module, sampling unit, interrupt signal generating unit and for controlling the main control module of external equipment, described sampling unit is connected in the outfan of described power module in parallel, and described anti-interference method comprises the following steps:
The first step, whether sampling unit Real-time Collection power module exists pulse interference signal, if sampling unit does not collect pulse interference signal, then master control module controls external equipment normal operation；
Second step, if sampling unit collects pulse interference signal, then described pulse signal is passed to described interrupt signal generating unit, described interrupt signal generating unit produces interrupt signal, and described interrupt signal is passed to described main control module, make the interrupt routine of described main control module setting in interference indicator, external equipment is shielded；
3rd step, when pulse interference signal disappears, the interrupt routine of described main control module terminates, and external equipment recovers normal operation.
Further, described sampling unit includes coupling electric capacity, and one end of described coupling electric capacity is connected on the outfan of described power module, and the other end is connected on described interrupt signal generating unit.
Further, described sampling unit also includes resistance, and described resistance is arranged between described coupling electric capacity and described interrupt signal generating unit.
Further, described interrupt signal generating unit is integrated in described main control module, and arranges corresponding interrupt signal acquisition interface on described main control module.
Further, being additionally provided with voltage regulation unit between described power module and main control module, the input of described voltage regulation unit connects and is connected with the outfan of described power module, and the outfan of described voltage regulation unit is connected with the power input interface of described main control module.
Further, it is additionally provided with filter unit between described voltage regulation unit and described main control module.
Further, described voltage regulation unit is low voltage difference line manostat.
Further, described filter unit includes two filter capacitors, and two described filter capacitors are connected in parallel on described voltage regulation unit outfan.
Adopt technique scheme, have the advantages that
Anti-EFT provided by the invention disturbs the anti-interference method of circuit; owing to the outfan at power module is provided with sampling unit; power supply can be entered shape detection by sampling unit in real time, when detecting that pulse conduction is disturbed, then the pulse of interference is passed to interrupt signal generating unit; it is made to produce interrupt signal; and interrupt signal is passed to main control module, make the interrupt routine of main control module setting in interference indicator, external equipment is shielded; thus protecting external equipment, it is provided that its eft immunity.Anti-EFT provided by the invention disturbs the anti-interference method of circuit, safe and reliable, it is possible to be effectively ensured electronic product steady operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the anti-interference method of the anti-EFT interference circuit of the present invention；
Fig. 2 is the electrical block diagram of the anti-interference method of the anti-EFT interference circuit of the present invention；
Fig. 3 is the logic control chart of the anti-interference method of the anti-EFT interference circuit of the present invention.
1-main control module；2-sampling unit；
3-voltage regulation unit；4-filter unit.
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.It should be noted that the word "front", "rear" of middle use is described below, direction that "left", "right", "up" and "down" refer in accompanying drawing, word " interior " and " outward " refer respectively to the direction towards or away from particular elements geometric center.
As depicted in figs. 1 and 2, the anti-EFT provided in one embodiment of the invention disturbs the anti-interference method of circuit, anti-EFT disturbs circuit to include power module, sampling unit 2, interrupt signal generating unit and for controlling the main control module 1 of external equipment, sampling unit 2 is connected in the outfan of power module in parallel, and anti-interference method comprises the following steps:
The first step, whether sampling unit 2 Real-time Collection power module exists pulse interference signal, if sampling unit 2 does not collect pulse interference signal, then main control module 1 controls external equipment normal operation；
Second step, if sampling unit 2 collects pulse interference signal, then pulse signal is passed to interrupt signal generating unit, interrupt signal generating unit produces interrupt signal, and interrupt signal is passed to main control module 1, make the interrupt routine of main control module 1 setting in interference indicator, external equipment is shielded；
3rd step, when pulse interference signal disappears, the interrupt routine of main control module 1 terminates, and external equipment recovers normal operation.
In the anti-interference method of the design, it is connected in parallel to sampling unit 2 at power end, sampling unit 2 can successively detect power supply output state, when power supply has pulse interference signal, sampling unit 2 can quickly detect this signal, and triggers coupled interrupt signal generating unit generation interrupt signal.Such main control module 1 can carry out rapidly anti-interference process, protects external equipment, such as components and parts such as sensitive sensor or chips.
Main control module 1 can be MCU, because MCU is easy to use, it is possible to achieve modularity and process the advantages such as function is strong, speed fast, low-power consumption.
The anti-EFT adopting the design disturbs the anti-interference method of circuit, it is not necessary to increase extra anti-interference device, it is possible to improves the eft immunity of product, and can reduce product E MC design difficulty and cost.
In the present embodiment, as in figure 2 it is shown, sampling unit 2 includes coupling electric capacity C1, one end of coupling electric capacity C1 is connected on the outfan of power module, and the other end is connected on interrupt signal generating unit.Physical features according to electric capacity is it can be seen that electric capacity can make ac signal pass through, thus the pulse signal that can quickly detect on power supply.
Above-mentioned sampling unit 2 also includes resistance R1, resistance R1 and is arranged between coupling electric capacity C1 and interrupt signal generating unit.Resistance R1 can reduce the current value in sample circuit, makes the current value in sample circuit can drop in safety range, it is ensured that controls the safety of module 1 and other electronic devices and components.The size of coupling electric capacity C1 and the size of resistance R1 can carry out selecting and adjusting according to the use environmental requirement of electronic product.
In the present embodiment, as in figure 2 it is shown, interrupt signal generating unit is integrated in main control module 1, and main control module 1 arranges corresponding interrupt signal acquisition interface.Main control module 1 can adopt single-chip microcomputer, MCU etc., and interrupt signal generating unit is become one by main control module 1, can effectively simplify the structure of product, simplify the connection between sampling unit 2 and main control unit 1 relevant interface, improve speed and the accuracy of sampled signal transmission.
In the present embodiment, as depicted in figs. 1 and 2, being additionally provided with voltage regulation unit 3 between power module and main control module 1, the input of voltage regulation unit 3 connects and is connected with the outfan of power module, and the outfan of voltage regulation unit 3 is connected with the power input interface of main control module 1.The power supply of input main control module 1 is carried out voltage stabilizing by voltage regulation unit 3, it is ensured that the stability of the magnitude of voltage of input main control module 1, improves the job stability of main control module 1.As in figure 2 it is shown, voltage regulation unit can adopt LDO voltage stabilizer, i.e. low pressure difference linear voltage regulator.When the input voltage of manostat is slightly above its output voltage, low pressure difference linear voltage regulator can also work, it is ensured that the stability of main control module 1 work.Meanwhile, the cost of low pressure difference linear voltage regulator is low, and noise is low, and quiescent current is little.
In the present embodiment, as in figure 2 it is shown, be additionally provided with filter unit 4 between voltage regulation unit 3 and main control module 1.Filter unit 4, for the ripple in elimination voltage regulation unit 3 output voltage, is further ensured that the stability of the voltage of input main control module 1, the magnitude of voltage of the power input VDD of MCU in Fig. 2, improves the job stability of MCU further.Filter unit 4 can adopt shnt capacitor C mode, or constitutes RC filter circuit or the filter circuit of other compounds with load in series inducer L.As long as the output voltage of voltage regulation unit 3 can be carried.
Above-mentioned filter unit 4 includes two filter capacitor C2 and C3, filter capacitor C2 and C3 and is connected in parallel on voltage regulation unit 3 outfan.As in figure 2 it is shown, one end of filter capacitor C2 is connected on the outfan of low pressure difference linear voltage regulator, other end ground connection.One end of another filter capacitor C3 is also connected on the outfan of low pressure difference linear voltage regulator, its other end ground connection.Two filter capacitor C2 and C3 are connected in parallel with each other on the outfan of low pressure difference linear voltage regulator, thus playing the effect of filter rectification.
According to different products and different practical service environments, filter capacitor C2 and C3 may select different size value.Such as, C2 be sized to 100nF, C3 be sized to 10uF, filter action can be realized.
Above-described is only principles of the invention and preferred embodiment.It should be pointed out that, for the person of ordinary skill of the art, on the basis of the principle of the invention, it is also possible to make other modification some, also should be regarded as protection scope of the present invention.
Claims (8)
1. the anti-interference method of an anti-EFT interference circuit, described anti-EFT disturbs circuit to include power module, sampling unit, interrupt signal generating unit and for controlling the main control module of external equipment, described sampling unit is connected in the outfan of described power module in parallel, it is characterized in that, described anti-interference method comprises the following steps:
The first step, whether sampling unit Real-time Collection power module exists pulse interference signal, if sampling unit does not collect pulse interference signal, then master control module controls external equipment normal operation；
Second step, if sampling unit collects pulse interference signal, then described pulse signal is passed to described interrupt signal generating unit, described interrupt signal generating unit produces interrupt signal, and described interrupt signal is passed to described main control module, make the interrupt routine of described main control module setting in interference indicator, external equipment is shielded；
3rd step, when pulse interference signal disappears, the interrupt routine of described main control module terminates, and external equipment recovers normal operation.
2. anti-EFT according to claim 1 disturbs the anti-interference method of circuit, it is characterized in that, described sampling unit includes coupling electric capacity, and one end of described coupling electric capacity is connected on the outfan of described power module, and the other end is connected on described interrupt signal generating unit.
3. anti-EFT according to claim 2 disturbs the anti-interference method of circuit, it is characterised in that described sampling unit also includes resistance, and described resistance is arranged between described coupling electric capacity and described interrupt signal generating unit.
4. anti-EFT according to claim 3 disturbs the anti-interference method of circuit, it is characterised in that described interrupt signal generating unit is integrated in described main control module, and arranges corresponding interrupt signal acquisition interface on described main control module.
5. anti-EFT according to claim 1 disturbs the anti-interference method of circuit, it is characterized in that, it is additionally provided with voltage regulation unit between described power module and main control module, the input of described voltage regulation unit connects and is connected with the outfan of described power module, and the outfan of described voltage regulation unit is connected with the power input interface of described main control module.
6. anti-EFT according to claim 5 disturbs the anti-interference method of circuit, it is characterised in that be additionally provided with filter unit between described voltage regulation unit and described main control module.
7. anti-EFT according to claim 5 disturbs the anti-interference method of circuit, it is characterised in that described voltage regulation unit is low voltage difference line manostat.
8. anti-EFT according to claim 6 disturbs the anti-interference method of circuit, it is characterised in that described filter unit includes two filter capacitors, and two described filter capacitors are connected in parallel on described voltage regulation unit outfan.
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| CN201410790258.6A CN105790230B (en) | 2014-12-17 | 2014-12-17 | A kind of anti-interference method of anti-EFT interference circuit |
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| CN201410790258.6A CN105790230B (en) | 2014-12-17 | 2014-12-17 | A kind of anti-interference method of anti-EFT interference circuit |
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| CN105790230A true CN105790230A (en) | 2016-07-20 |
| CN105790230B CN105790230B (en) | 2017-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064161A (en) * | 2019-12-31 | 2020-04-24 | 苏州浪潮智能科技有限公司 | System for enhancing EFT interference resistance of server |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887225A (en) * | 2005-06-29 | 2007-01-03 | 深圳迈瑞生物医疗电子股份有限公司 | Antijamming respiratory wave acquiring method and device |
| KR101041752B1 (en) * | 2011-02-01 | 2011-06-17 | 주식회사 시지트로닉스 | Semiconductor filter of multi-stage structure and fabrication method thereof |
| CN203101478U (en) * | 2013-01-07 | 2013-07-31 | 珠海万力达电气股份有限公司 | Multifunctional digital electric power instrument having strong anti-EFT capability |
| CN203387400U (en) * | 2013-03-14 | 2014-01-08 | 孙明云 | Electrical rapid transient interference eliminator |
-
2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887225A (en) * | 2005-06-29 | 2007-01-03 | 深圳迈瑞生物医疗电子股份有限公司 | Antijamming respiratory wave acquiring method and device |
| KR101041752B1 (en) * | 2011-02-01 | 2011-06-17 | 주식회사 시지트로닉스 | Semiconductor filter of multi-stage structure and fabrication method thereof |
| CN203101478U (en) * | 2013-01-07 | 2013-07-31 | 珠海万力达电气股份有限公司 | Multifunctional digital electric power instrument having strong anti-EFT capability |
| CN203387400U (en) * | 2013-03-14 | 2014-01-08 | 孙明云 | Electrical rapid transient interference eliminator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064161A (en) * | 2019-12-31 | 2020-04-24 | 苏州浪潮智能科技有限公司 | System for enhancing EFT interference resistance of server |
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