CN202501846U - Inhibition anti-interference structure for gradienter - Google Patents
Inhibition anti-interference structure for gradienter Download PDFInfo
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- CN202501846U CN202501846U CN2011204829932U CN201120482993U CN202501846U CN 202501846 U CN202501846 U CN 202501846U CN 2011204829932 U CN2011204829932 U CN 2011204829932U CN 201120482993 U CN201120482993 U CN 201120482993U CN 202501846 U CN202501846 U CN 202501846U
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- level meter
- jamproof
- circuit
- interference structure
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Abstract
The utility model discloses an inhibition anti-interference structure for gradienters. The structure (1) is composed by an internal inhibition anti-interference structure (2) and an external inhibition anti-interference structure (3). The internal inhibition anti-interference structure (2) and the external inhibition anti-interference structure (3) are both hardware systems of the gradienter. The internal inhibition anti-interference structure (2) and the external inhibition anti-interference structure (3) are in a circuit connection. The structure totally employs low power consumption devices, reduces the bus load, and has the advantages of high stability and reliability, no error, high precision, low noise, etc.
Description
Technical field
The utility model discloses a kind of level meter and suppress jamproof composition structure, relate in particular to stability and the high jamproof composition structure of inhibition of reliability that a kind of measure and control instrument instrument is used.Belong to the measure and control instrument Instrument technology field.
Background technology
To anti-interference in the measure and control instrument instrument, cause precision not high in the prior art, the bad factor of stability has following several kinds:
(1) inside configuration noise.In traditional Design of Digital Integrated Circuit; Usually power supply and ground end being arranged in the both sides of symmetry, is ground like the lower left corner, and the upper left corner is power supply; This makes power supply noise pass whole silicon wafer, also has noise voltage (like switching noise, capacitor noise, high-frequency transformer noise, audio-frequency noise).
(2) design of Grounding Connections.The main cause of prior art is that electric currents at different levels produce when flowing through a public ground and disturb; The loop that multipoint earthing forms is prone to make circuit disturbed and earthy the influence by external electromagnetic field.
(3) circuit fabric swatch.The main cause of prior art is the thickness of Copper Foil, crosstalking between the width of printed conductor, length and the adjacent lines, and layout is unreasonable in the plate, and the electromagnetic field that in the space, produces of the common impedance of lead, lead and components and parts etc.
(4) natural Electromagnetic Interference.The energy of electromagnetic interference (EMI) is aloft propagated with form of electromagnetic wave; It comprises the electromagnetic wave by astronomical radiations such as the sun; The electromagnetic wave that broadcasting, TV and various Wireless Telecom Equipment send, the electromagnetic interference (EMI) that household electrical appliance such as air conditioner, daylight lamp, micro-wave oven produce is difficult to get rid of these electromagnetic interference usually in the prior art; Cause the measure and control instrument instrumentation program out of control, control problems such as malfunctioning.
Summary of the invention
Because the TT&C system internal circuit of level meter is comparatively complicated, and sensor is not only arranged, and also has input channel; Single-chip microcomputer, digital display device, interface circuit, control circuit, mu balanced circuit and peripheral circuit etc.; And simulation and digital circuit are also deposited, and hardware combines with software.It when long distance transmission analog or digital signal, not only receive extraneous strong jamming easily, and self also can produce interference under industrial environment.Therefore, the purpose of the utility model is to overcome the weak point that exists in the above-mentioned prior art, can make the whole observing and controlling systematicness of level meter price ratio reasonable thereby provide, and develop the jamproof composition structure of a kind of inhibition.
The utility model is to realize through following method:
A kind of level meter suppresses jamproof composition structure, and said structure 1 suppresses anti-interference structure 2 by inside and forms with the outside anti-interference structure 3 that suppresses; The said inner anti-interference structure 2 that suppresses all is the hardware system of level meter with outside inhibition anti-interference structure 3; The said inner anti-interference structure 2 that suppresses is that circuit is connected with outside inhibition anti-interference structure 3.
The said inner anti-interference structure 2 that suppresses comprises single-chip microcomputer 201, power circuit 202, digital circuit 203, signal circuit 204, peripheral circuit 205, electric capacity 206, wave filter 207, photoelectrical coupler 208, printed conductor 209.
Said electric capacity 206 comprises decoupling capacitor 2061 and denoising electric capacity 2062.Said wave filter 207 is a SCF, and this wave filter 207 reliability and stability are high, can avoid the influences such as various errors, drift of discrete component.
Being respectively equipped with decoupling capacitor 2061 in said power circuit 202, digital circuit 203, the signal circuit 204, is suitable configuration decoupling capacitor 2061 in power circuit 202, digital circuit 203 and signal processing circuit 204, promptly forms isolation circuit.
Said decoupling capacitor 2061 comprises ROHS and ceramic disc capacitor; Said decoupling capacitor is the general 0.1uF of employing ceramic disc capacitor.
Said single-chip microcomputer 201 is arranged together with peripheral circuit 205, to shorten data and address bus length, can obtain better anti-interference effect like this;
Said noise reduction electric capacity 2062 is positioned at the next door of each IC assembly, in order to reduce the interference that outside line is introduced.
Said photoelectrical coupler 208 is positioned at the place near outlet terminal.
The circuit of the simulation small signal circuit on the wiring board away from easy generation interference such as Digital Logic, simulation large-signals;
Said printed conductor 209 corners are circular arc, 1～80 degree angle; Preferential satisfactory arc or miter angle.Said printed conductor 209 infalls are an angle of 90 degrees; The width of said printed conductor 209 should be even; Said printed conductor 209 between the adjacent circuit should be not parallel.Long parallel lines should not arranged between the adjacent circuit, it is parallel that cabling is avoided as far as possible;
Get circular arc or miter angle in the printed conductor corner, avoid 90 degree right angles.Because right angle or angle can influence electric property in high-frequency circuit; And infall is used vertical mode, and live width is not suddenlyd change, and does not also want unexpected turning, to avoid feedback coupling.
The said outside anti-interference structure 3 that suppresses comprises power supply 301, input and output channel isolation 302, shielding 303; Said power supply 301 is held on two pins of believing with ground.So not only reduced the electric current that passes whole silicon wafer, also be convenient to high meter power supply coupling capacitor on printed circuit board, to reduce the total noise.
The utility model structure is mainly used in the measure and control instrument instrument, and along with the development of modern precision technical device, people get up high more to the accuracy requirement of making, measure, suppress jamproof composition structure so design a kind of level meter at present.This structure has following beneficial effect: this composition structure all adopts low energy-consumption electronic device, reduces bus load, and is rationally distributed in the plate, and stability and reliability are high, and be error free, and precision is high, low noise and other advantages.
Description of drawings
Fig. 1 suppresses jamproof composition structural representation for level meter
Fig. 2 is the circuit diagram of SCF
Embodiment
Further describe the utility model below in conjunction with accompanying drawing 1 and accompanying drawing 2:
Embodiment one:
A kind of level meter suppresses jamproof composition structure, and its structure (1) suppresses anti-interference structure (2) by inside and the outside anti-interference structure (3) that suppresses is formed; Said inner inhibition anti-interference structure (2) and outside inhibition anti-interference structure (3) all are the hardware system of level meter; The said inner anti-interference structure (2) that suppresses is that circuit is connected with outside inhibition anti-interference structure (3).
The further said inner anti-interference structure (2) that suppresses comprises single-chip microcomputer (201), power circuit (202), digital circuit (203), signal circuit (204), peripheral circuit (205), electric capacity (206), wave filter (207), photoelectrical coupler (208), printed conductor (209).
Further said electric capacity (206) comprises decoupling capacitor (2061) and denoising electric capacity (2062); Said wave filter (207) is a SCF.
Be respectively equipped with decoupling capacitor (2061) in further said power circuit (202), digital circuit (203), the signal circuit (204).
Further said decoupling capacitor (2061) comprises ROHS and ceramic disc capacitor; Said decoupling capacitor is the 0.1uF ceramic disc capacitor.
Further said single-chip microcomputer (201) and peripheral circuit (205) are arranged together.
Further said denoising electric capacity (2062) is positioned at the next door of each IC assembly.
Further said photoelectrical coupler (208) is positioned at the place near outlet terminal.
Further said printed conductor (209) corner is that circular arc or miter angle can; Said printed conductor (209) infall is an an angle of 90 degrees; The width of said printed conductor (209) should be even; Said printed conductor (209) between the adjacent circuit should be not parallel.
The further said outside anti-interference structure (3) that suppresses comprises power supply (301), input and output channel isolation (302), shielding (303); Said power supply (301) and ground end are on two pins of believing.
Embodiment two:
Noise is handled through filtering and the test that reduces bandwidth, can reduce noise.
Adopt the integrated switched capacitor wave filter that sensor signal is carried out analog filtering in this structure, its 3dB cutoff frequency can be selected between 0.1～25kHz, has fixing normalized frequency response.Oscillation frequency f
OSCWith the ratio of cutoff frequency fc be 100: 1.If directly utilize the internal clocking oscillator of wave filter, only need an external electric capacity, its capacitance and 3dB cutoff frequency then satisfy following formula:
Directly adopt the MAX291 internal oscillator in this structure, the electric capacity of external 1500PF, its circuit diagram is shown in accompanying drawing 2:
Then go up us from the chip hand and can find when ADXL202 is operated in simulation output, following formula is arranged:
0?g?Offset＝VDD/2?2.5?V?at+5V
Can know; Wave filter is operated in the 5V WV; Modulate circuit through being made up of differential operational amplifier and automatic control for frequency characteristics of filter integrated becomes amplitude 0-5V, and frequency is the voltage signal of 0-60Hz; Voltage signal through conditioning becomes 0-2.5V through amplitude behind the bleeder circuit again, to adapt to 12 A/D samplings that single-chip microcomputer carries.The reliability and stability of SCF are high, avoided the influences such as various errors, drift of discrete component.
Claims (10)
1. a level meter suppresses jamproof composition structure, it is characterized in that, said structure (1) suppresses anti-interference structure (2) by inside and the outside anti-interference structure (3) that suppresses is formed; Said inner inhibition anti-interference structure (2) and outside inhibition anti-interference structure (3) all are the hardware system of level meter; The said inner anti-interference structure (2) that suppresses is that circuit is connected with outside inhibition anti-interference structure (3).
2. a kind of level meter according to claim 1 suppresses jamproof composition structure; It is characterized in that the said inner anti-interference structure (2) that suppresses comprises single-chip microcomputer (201), power circuit (202), digital circuit (203), signal circuit (204), peripheral circuit (205), electric capacity (206), wave filter (207), photoelectrical coupler (208), printed conductor (209).
3. a kind of level meter according to claim 2 suppresses jamproof composition structure, it is characterized in that, said electric capacity (206) comprises decoupling capacitor (2061) and denoising electric capacity (2062); Said wave filter (207) is a SCF.
4. a kind of level meter according to claim 2 suppresses jamproof composition structure, it is characterized in that, is respectively equipped with decoupling capacitor (2061) in said power circuit (202), digital circuit (203), the signal circuit (204).
5. a kind of level meter according to claim 3 suppresses jamproof composition structure, it is characterized in that, said decoupling capacitor (2061) comprises ROHS and ceramic disc capacitor; Said decoupling capacitor is the 0.1uF ceramic disc capacitor.
6. a kind of level meter according to claim 2 suppresses jamproof composition structure, it is characterized in that, said single-chip microcomputer (201) and peripheral circuit (205) are arranged together.
7. a kind of level meter according to claim 3 suppresses jamproof composition structure, it is characterized in that, said denoising electric capacity (2062) is positioned at the next door of each IC assembly.
8. a kind of level meter according to claim 2 suppresses jamproof composition structure, it is characterized in that, said photoelectrical coupler (208) is positioned at the place near outlet terminal.
9. a kind of level meter according to claim 2 suppresses jamproof composition structure, it is characterized in that, said printed conductor (209) corner is circular arc, 1～80 degree angle; Said printed conductor (209) infall is an an angle of 90 degrees; The width of said printed conductor (209) should be even; Said printed conductor (209) between the adjacent circuit should be not parallel.
10. a kind of level meter according to claim 1 suppresses jamproof composition structure, it is characterized in that, the said outside anti-interference structure (3) that suppresses comprises power supply (301), input and output channel isolation (302), shielding (303).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204829932U CN202501846U (en) | 2011-11-29 | 2011-11-29 | Inhibition anti-interference structure for gradienter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204829932U CN202501846U (en) | 2011-11-29 | 2011-11-29 | Inhibition anti-interference structure for gradienter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202501846U true CN202501846U (en) | 2012-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204829932U Expired - Fee Related CN202501846U (en) | 2011-11-29 | 2011-11-29 | Inhibition anti-interference structure for gradienter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281677A (en) * | 2014-06-26 | 2016-01-27 | 上海力构传感器科技有限公司 | Design for front circuit board of extremely-low-noise charge-amplifier |
-
2011
- 2011-11-29 CN CN2011204829932U patent/CN202501846U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281677A (en) * | 2014-06-26 | 2016-01-27 | 上海力构传感器科技有限公司 | Design for front circuit board of extremely-low-noise charge-amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20151129 |