CN105790230B - A kind of anti-interference method of anti-EFT interference circuit - Google Patents
A kind of anti-interference method of anti-EFT interference circuit Download PDFInfo
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- CN105790230B CN105790230B CN201410790258.6A CN201410790258A CN105790230B CN 105790230 B CN105790230 B CN 105790230B CN 201410790258 A CN201410790258 A CN 201410790258A CN 105790230 B CN105790230 B CN 105790230B
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Abstract
The invention discloses a kind of anti-interference method of anti-EFT interference circuit, the anti-EFT interference circuit includes power module, sampling unit, interrupt signal generating unit and the main control module for controlling external equipment, sampling unit is connected in the output end of power module in parallel, anti-interference method comprises the following steps, the first step, sampling unit gathers power module and whether there is pulse interference signal in real time, if not collecting pulse interference signal, master control module controls external equipment normal work；Second step, if collecting pulse interference signal, interrupt signal generating unit produces interrupt signal, and interrupt signal is passed into main control module, and the interrupt routine of main control module shields setting in interference indicator to external equipment；3rd step, when pulse interference signal disappears, the interrupt routine of main control module terminates, and external equipment recovers normal work.Anti-interference method provided by the invention is safe and reliable, it is ensured that electronic product steady operation.
Description
Technical field
The present invention relates to electronic product anti-disturbance method, more particularly to a kind of anti-interference method of anti-EFT interference circuit.
Background technology
Electronic product in actual use, because power grid environment has various noises, such as large scale equipment power switch
Opening and closing, all kinds of Switching Power Supply start and stop, or even the factor such as outside thunder-strike phenomenon all can produce various Conduction Interferences to power network, enter
And interference effect is produced to the electronic product in circuit and other equipment, cause electronic product that dysfunction occurs or even loses
The situation of mistake.
Currently used anti-EFT conflicting modes are to set some anti-interference components and optimization PCB layouts in circuit
Wiring, this method can improve the anti-EFT performances of electronic product in Shangdi to a certain degree, but as the anti-interference grade of electronic product will
Increase is asked, actual needs can not be only met by aforesaid way.Particularly when occurring serious power supply instantaneous interference in circuit, i.e.,
It is optimal PCB wiring, and adds some anti-interference components, the Sensitive Apparatus in circuit can be still interfered, production
Raw abnormal response.
Therefore, it is necessary to which a kind of anti-interference method of anti-EFT interference circuit, can make equipment more directly effectively detect and support
Resist all kinds of power environment noise jammings, without by electronic circuit placement-and-routing, increasing anti-interference component etc., ensureing product
It can be worked in the power environment with ambient noise normal table.
The content of the invention
In view of this, it is an object of the invention to overcome in the prior art the defects of, there is provided a kind of anti-EFT interference circuit
Anti-interference method, this method need not ensure electronic product one by electronic circuit placement-and-routing or the anti-interference component of increase
Determine to work in the power environment of ambient noise normal table.
The anti-interference method of anti-EFT interference circuit provided by the invention, the anti-EFT interference circuit include power module,
Sampling unit, interrupt signal generating unit and the main control module for controlling external equipment, the sampling unit are connected in parallel
The output end of the power module, the anti-interference method comprise the following steps：
The first step, sampling unit gathers power module and whether there is pulse interference signal in real time, if sampling unit is not adopted
Collect pulse interference signal, then master control module controls external equipment normal work；
Second step, if sampling unit collects pulse interference signal, pulse interference signal is passed into described interrupt and believed
Number generating unit, the interrupt signal generating unit produces interrupt signal, and the interrupt signal is passed into the master control
Module, the interrupt routine of the main control module is set to be shielded setting in interference indicator to external equipment；
3rd step, when pulse interference signal disappears, the interrupt routine of the main control module terminates, and external equipment recovers just
Often work.
Further, the sampling unit includes coupled capacitor, and one end of the coupled capacitor is connected to the power module
Output end on, the other end is connected on the interrupt signal generating unit.
Further, the sampling unit also includes resistance, and the resistance is arranged on the coupled capacitor to be believed with described interrupt
Between number generating unit.
Further, the interrupt signal generating unit is integrated in the main control module, and is set on the main control module
Put corresponding interrupt signal acquisition interface.
Further, voltage regulation unit, the input of the voltage regulation unit are additionally provided between the power module and main control module
Connection is connected with the output end of the power module, the output end of the voltage regulation unit and the power input of the main control module
Interface is connected.
Further, it is additionally provided with filter unit between the voltage regulation unit and the main control module.
Further, the voltage regulation unit is low voltage difference line voltage-stablizer.
Further, the filter unit includes two filter capacitors, and two filter capacitors are connected in parallel described steady
Press in unit output end.
Using above-mentioned technical proposal, have the advantages that：
The anti-interference method of anti-EFT interference circuit provided by the invention, is adopted due to being provided with the output end of power module
Sample unit, sampling unit can enter shape detection to power supply in real time, when detecting pulse conduction interference, then pass the pulse of interference
Interrupt signal generating unit is passed, it is produced interrupt signal, and interrupt signal is passed into main control module, makes main control module
Interrupt routine shields, so as to protect external equipment, there is provided its eft immunity setting in interference indicator to external equipment.This
The anti-interference method for the anti-EFT interference circuits that invention provides, securely and reliably, can be effectively ensured electronic product steady operation.
Brief description of the drawings
Fig. 1 is the schematic diagram of the anti-interference method of the anti-EFT interference circuits of the present invention；
Fig. 2 is the electrical block diagram of the anti-interference method of the anti-EFT interference circuits of the present invention；
Fig. 3 is the logic control chart of the anti-interference method of the anti-EFT interference circuits of the present invention.
1- main control modules；2- sampling units；
3- voltage regulation units；4- filter units.
Embodiment
Below in conjunction with the accompanying drawings come further illustrate the present invention embodiment.It should be noted that below in description
The word "front", "rear", "left", "right", the "up" and "down" that use refer to the direction in accompanying drawing, word " interior " and " outer " difference
Refer to towards or away from the direction of particular elements geometric center.
As depicted in figs. 1 and 2, the anti-interference method of the anti-EFT interference circuits provided in one embodiment of the invention, anti-EFT
Interference circuit includes power module, sampling unit 2, interrupt signal generating unit and the main control module 1 for controlling external equipment,
Sampling unit 2 is connected in the output end of power module in parallel, and anti-interference method comprises the following steps：
The first step, sampling unit 2 gathers power module and whether there is pulse interference signal in real time, if sampling unit 2 does not have
Pulse interference signal is collected, then main control module 1 controls external equipment normal work；
Second step, if sampling unit 2 collects pulse interference signal, pulse interference signal is passed into interrupt signal hair
Raw unit, interrupt signal generating unit produces interrupt signal, and interrupt signal is passed into main control module 1, makes main control module 1
Interrupt routine 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
Work.
In the anti-interference method of the design, sampling unit 2 is connected in parallel in power end, sampling unit 2 can continuously not
Disconnected detection power supply output state, when there is pulse interference signal on power supply, sampling unit 2 can quickly detect the signal, and
Trigger coupled interrupt signal generating unit and produce interrupt signal.So main control module 1 can be carried out rapidly anti-interference
Processing, protect external equipment, such as sensitive sensor or chip component.
Main control module 1 can be MCU, because MCU is easy to use, it is possible to achieve modularization and processing function are strong, speed
It hurry up, the advantage such as low-power consumption.
The anti-interference method of circuit is disturbed using the anti-EFT of the design, it is not necessary to increase extra anti-interference device, so that it may
To improve the eft immunity of product, and product E MC design difficulties and cost can be reduced.
In the present embodiment, as shown in Fig. 2 sampling unit 2 includes coupled capacitor C1, coupled capacitor C1 one end is connected to electricity
In the output end of source module, the other end is connected on interrupt signal generating unit.It can be seen from the physical features of electric capacity, electric capacity can
So that ac signal is by so as to quickly detect the pulse signal on power supply.
Above-mentioned sampling unit 2 also includes resistance R1, resistance R1 be arranged on coupled capacitor C1 and interrupt signal generating unit it
Between.Resistance R1 can reduce the current value in sample circuit, the current value in sample circuit is dropped in safe range, protect
Demonstrate,prove control module 1 and the safety of other electronic components.Coupled capacitor C1 size and resistance R1 size can be according to electricity
The use environment requirement of sub- product is selected and adjusted.
In the present embodiment, as shown in Fig. 2 interrupt signal generating unit is integrated in main control module 1, and main control module 1
It is upper that corresponding interrupt signal acquisition interface is set.Main control module 1 can use single-chip microcomputer, MCU etc., and main control module 1 will interrupt
Signal generating unit becomes one, and can effectively simplify the structure of product, simplifies that sampling unit 2 is related to main control unit 1 to be connect
Connection between mouthful, improve the speed and accuracy of sampled signal transmission.
In the present embodiment, as depicted in figs. 1 and 2, voltage regulation unit 3, voltage stabilizing are additionally provided between power module and main control module 1
The input connection of unit 3 is connected with the output end of power module, the output end of voltage regulation unit 3 and the power supply of main control module 1
Input interface is connected.Voltage regulation unit 3 carries out voltage stabilizing to the power supply for inputting main control module 1, ensures the voltage of input main control module 1
The stability of value, improve the job stability of main control module 1.As shown in Fig. 2 voltage regulation unit can use LDO voltage stabilizer, i.e., it is low
Pressure difference linear voltage regulator.When the input voltage of voltage-stablizer is slightly above its output voltage, low pressure difference linear voltage regulator can also work
Make, ensure the stability that main control module 1 works.Meanwhile the cost of low pressure difference linear voltage regulator is low, noise is low, and quiescent current is small.
In the present embodiment, as shown in Fig. 2 being additionally provided with filter unit 4 between voltage regulation unit 3 and main control module 1.Filter unit
4 are used to filter off the ripple in the output voltage of voltage regulation unit 3, are further ensured that the stability of the voltage of input main control module 1, such as scheme
MCU power input VDD magnitude of voltage in 2, further improve MCU job stability.Filter unit 4 can use parallel connection
Capacitor C modes, or constitute RC filter circuits, or other compound filter circuits with load in series inductor L.As long as energy
Carry the output voltage of voltage regulation unit 3.
Above-mentioned filter unit 4 includes two filter capacitors C2 and C3, and filter capacitor C2 and C3 are connected in voltage regulation unit 3 in parallel
In output end.As shown in Fig. 2 filter capacitor C2 one end is connected in the output end of low pressure difference linear voltage regulator, another termination
Ground.Another filter capacitor C3 one end is also connected in the output end 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 in the output end of low pressure difference linear voltage regulator, so as to play the work of filter rectification
With.
According to different products and different practical service environments, different size value may be selected in filter capacitor C2 and C3.
For example, C2 size is 100nF, C3 size is 10uF, you can realizes filter action.
Above-described is only the principle and preferred embodiment of the present invention.It should be pointed out that the common skill for this area
For art personnel, on the basis of the principle of the invention, some other modifications can also be made, also should be regarded as the protection model of the present invention
Enclose.
Claims (8)
1. a kind of anti-interference method of anti-EFT interference circuit, the anti-EFT interference circuit include power module, sampling unit, in
Break signal generating unit and the main control module for controlling external equipment, the sampling unit are connected in the power module in parallel
Output end, it is characterised in that the anti-interference method comprises the following steps：
The first step, sampling unit gathers power module and whether there is pulse interference signal in real time, if sampling unit does not collect
Pulse interference signal, then master control module controls external equipment normal work；
Second step, if sampling unit collects pulse interference signal, pulse interference signal is passed into the interrupt signal and sent out
Raw unit, the interrupt signal generating unit produces interrupt signal, and the interrupt signal is passed into the main control module,
The interrupt routine of the main control module is set to be shielded setting in interference indicator to external equipment；
3rd step, when pulse interference signal disappears, the interrupt routine of the main control module terminates, and external equipment recovers normal work
Make.
2. the anti-interference method of anti-EFT interference circuit according to claim 1, it is characterised in that the sampling unit bag
Include coupled capacitor, one end of the coupled capacitor is connected in the output end of the power module, the other end be connected to it is described in
On break signal generating unit.
3. the anti-interference method of anti-EFT interference circuit according to claim 2, it is characterised in that the sampling unit is also
Including resistance, the resistance is arranged between the coupled capacitor and the interrupt signal generating unit.
4. the anti-interference method of anti-EFT interference circuit according to claim 3, it is characterised in that the interrupt signal hair
Raw unit is integrated in the main control module, and corresponding interrupt signal acquisition interface is set on the main control module.
5. the anti-interference method of anti-EFT interference circuit according to claim 1, it is characterised in that the power module with
Voltage regulation unit is additionally provided between main control module, the input connection of the voltage regulation unit is connected with the output end of the power module
Connect, the output end of the voltage regulation unit is connected with the power input interface of the main control module.
6. the anti-interference method of anti-EFT interference circuit according to claim 5, it is characterised in that the voltage regulation unit with
Filter unit is additionally provided between the main control module.
7. the anti-interference method of anti-EFT interference circuit according to claim 5, it is characterised in that the voltage regulation unit is
Low voltage difference line voltage-stablizer.
8. the anti-interference method of anti-EFT interference circuit according to claim 6, it is characterised in that the filter unit bag
Two filter capacitors are included, two filter capacitors are connected in parallel in the voltage regulation unit output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN105790230A CN105790230A (en) | 2016-07-20 |
| CN105790230B true CN105790230B (en) | 2017-12-22 |
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| 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
- 2014-12-17 CN CN201410790258.6A patent/CN105790230B/en active Active
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 |
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