CN2926998Y - Anti-interference circuit board of digital flowmeter - Google Patents
Anti-interference circuit board of digital flowmeter Download PDFInfo
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- CN2926998Y CN2926998Y CN 200620012899 CN200620012899U CN2926998Y CN 2926998 Y CN2926998 Y CN 2926998Y CN 200620012899 CN200620012899 CN 200620012899 CN 200620012899 U CN200620012899 U CN 200620012899U CN 2926998 Y CN2926998 Y CN 2926998Y
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Abstract
The utility model relates to an anti-jamming circuit board used in digital flowmeter, which comprises power panel, mainboard, display panel and drive panel. The characteristics are that the mainboard is a circuit integrated by four layers including top signal layer (1), ground signal layer (2), power signal layer (3) and bottom signal layer (4). The ground signal layer is made up of two subsections including digital ground (9) and analog ground (8), with the tow subsections are connected by low-resistance conducting strip (10). The power layer is made up of two subsections including analog 5V (11) and digital 5V (12), with a connecting circuit (13) for leveling difference between digital voltage and analog voltage is arranged between the two subsections. Blank space on surfaces of the top layer and bottom layer of the mainboard are painted by copper. The utility model with improved anti-jamming performance can be used in flowmeter for stabilizing performance of the flowmeter, improving precision in measurement and reducing fault.
Description
Technical field
The utility model relates to a kind of parts of device of measurement gas mass rate, specifically a kind of circuit board of digital mass rate integrating instrument.
Background technology
Flow integrator is the device that the mass rate to gas or liquid detects, and this flow integrator shows the mass rate detection signal of thermal mass flow sensor output and accumulates.Flow integrator has the simulation formula, and its volume is big, detects accurate inadequately; At present, digital flow integrator is used commonplace, and its volume is little, measures comparatively accurately, can detect the controller coupling with the mass rate of different model and use, and realizes a tractor serves several purposes, can also carry out communication with host computer, the realization Long-distance Control.But digital flow integrator will carry out the conversion of modulus and digital-to-analogue, in same surface-mounted integrated circuit, inevitably is provided with simulation device and circuit thereof and digital device and circuit thereof simultaneously.These two kinds of devices and circuit are in operation and will inevitably produce mutual electromagnetic interference (EMI).Present digital flow integrating instrument, its motherboard circuit adopt odt circuit wiring more, i.e. top layer circuit and bottom circuit, and this structure electromagnetic interference (EMI) is difficult to wall to be exempted from, and influence measuring accuracy, and conduct and radiance etc. is difficult to reach requirement.For this reason, need to propose a kind of circuit board of new design.
The utility model content
The purpose of this utility model is at the problems referred to above, a kind of anti-jamming circuit plate of digital flow integrating instrument is proposed, this circuit board has adopted the multilayer circuit board wiring technique, has improved Electro Magnetic Compatibility and antijamming capability, has improved the accuracy of detection and the various performance of mass rate.
The purpose of this utility model is achieved through the following technical solutions:
A kind of anti-jamming circuit plate of digital flow integrating instrument, mainly comprise power panel, mainboard, display board, drive plate, it is characterized in that described mainboard is four layers of surface-mounted integrated circuit, is top layer signals layer, earth signal layer, power supply signal layer and bottom layer signal layer from top to bottom in proper order; Described earth signal layer is connected by a small resistor conducting strip between two subregions by digitally constituting with two subregions in simulation ground; Described bus plane is made of simulation 5V and two subregions of digital 5V, is connected by a circuit of stabilizing pressure reduction between digital voltage and the aanalogvoltage between two subregions; The blank space of the circuit of the top layer of described mainboard and bottom outside is all covered copper.
The anti-jamming circuit plate of a kind of digital flow integrating instrument of the present utility model, further perfect scheme is, described power panel ± two signal ends of 15V and connect outward and be provided with filtering circuit between the port, this filtering circuit is by a T mode filter and the pi type filter that the capacitor parallel connection constitutes.
The anti-jamming circuit plate of a kind of digital flow integrating instrument of the present utility model, a concrete scheme is that the connection circuit between two subregions of the simulation 5V of described bus plane and digital 5V is made up of two schottky diodes, a magnetic bead, a resistance and two capacitors.
The utility model is owing to adopted the structure of multilayer wiring, with analog component and digital element device and signal connection, power supply and earth signal layering and zoning design, between the simulation region of bus plane and digital block, be provided with and stabilize the voltage difference circuit, so improved the phase mutual interference between analog-and digital-two class circuit, power supply and the signal effectively, improved jamproof performance greatly, and because copper has all been covered in the clear area of the circuits outside of top layer and bottom, thereby also improved the ability of anti-extraneous interference; Described power panel ± two signal ends of 15V and connect outward and be provided with filtering circuit between the port, thus the quality of signal transmission also improved.Therefore, the utility model compared with prior art has the conduction and the radiation Immunity Performance of raising equipment, and Electro Magnetic Compatibility and antijamming capability are strong, and the measuring accuracy height is stable, is not easy to break down the advantage that service life of equipment is long.
Description of drawings
Fig. 1 is four layers of wiring structural representation of main circuit board of the present utility model.
Fig. 2 is the earth signal layer structural representation of main circuit board of the present utility model.
Fig. 3 is the power supply signal layer structural representation of main circuit board of the present utility model.
Fig. 4 is a pi filter circuit diagram of the present utility model.
Fig. 5 is simulation 5V of the present utility model and digital 5V two by stages connecting circuit synoptic diagram.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further:
Embodiment: referring to accompanying drawing, a kind of anti-jamming circuit plate of digital flow integrating instrument, mainly comprise power panel, mainboard, display board, drive plate, described mainboard is four layers of surface-mounted integrated circuit, is top layer signals layer 1, earth signal layer 2, power supply signal layer 3 and bottom layer signal layer 4 from top to bottom in proper order; Described earth signal layer by digitally 9 and 8 two subregions in simulation ground constitute, connect by a small resistor conducting strip 10 between two subregions; Described bus plane is made of simulation 5V 11 and 12 two subregions of digital 5V, is provided with a connecting circuit 13 of stabilizing pressure reduction between digital voltage and the aanalogvoltage between two subregions; The circuit blank space of the top layer of described mainboard and bottom outside is all covered copper; Described power panel ± two signal ends of 15V and connect outward and be provided with π type filtering circuit between the port one 4, it is the pi type filter that is made of a TL-221M mode filter U1 and capacitor C3 parallel connection that-15V holds this filtering circuit, and it also is the pi type filter that is made of a TL-221M mode filter U2 and 120pF capacitor C4 parallel connection that+15V holds this filtering circuit.Connection circuit between 12 two subregions of the simulation 5V 11 of described bus plane and digital 5V is made up of two 10BQ040 schottky diode D1, D2, a HS102 magnetic bead B, 1.5 Ω resistance R and two 10 μ F capacitor C1, C2.When digital 5V was excessive with simulation 5V pressure reduction, in them one will conducting, digital 5V and simulation 5V are limited to ± 0.3V in, the little impedance resistance of magnetic bead and 1.5 Ω has guaranteed that simulation 5V can not be subjected to the interference of digital 5V; Capacitor C 1 and C2 are respectively the decoupling capacitors over the ground of simulation 5V and digital 5V.
Use the digital flow integrating instrument of anti-jamming circuit plate of the present utility model assembling, waltzed through the conduction of stipulating in the EN61326 standard of CE authentication, conducted anti-winding degree, radiation, radiation immunity, surge, power supply flicker, electric voltage dropping and interruptions in short-term, fast-pulse group, static discharge, power frequency magnetic field is tested and the EN61010 standard in the safety stipulated test.
Claims (3)
1. the anti-jamming circuit plate of a digital flow integrating instrument, mainly comprise power panel, mainboard, display board, drive plate, it is characterized in that, described mainboard is four layers of surface-mounted integrated circuit, is top layer signals layer (1), earth signal layer (2), power supply signal layer (3) and bottom layer signal layer (4) from top to bottom in proper order; Described earth signal layer is made of (8) two subregions in digitally (9) and simulation ground, is connected by a small resistor conducting strip (10) between two subregions; Described bus plane is made of simulation 5V (11) and (12) two subregions of digital 5V, is provided with a connecting circuit (13) of stabilizing pressure reduction between digital voltage and the aanalogvoltage between two subregions; The blank space of the circuit of the top layer of described mainboard and bottom outside is all covered copper.
2, the anti-jamming circuit plate of a kind of digital flow integrating instrument according to claim 1, it is characterized in that, described power panel ± two signal ends of 15V and connect outward between the port (14) and be provided with filtering circuit, this filtering circuit is by a T mode filter (U1, U2) and a capacitor (C3, the C4) pi type filter that constitutes in parallel.
3, according to the anti-jamming circuit plate of described a kind of digital flow integrating instrument of claim, it is characterized in that the connection circuit between (12) two subregions of the simulation 5V (11) of described bus plane and digital 5V is made up of two schottky diodes (D1, D2), a magnetic bead (B), a resistance (R) and two capacitors (C1, C2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620012899 CN2926998Y (en) | 2006-04-18 | 2006-04-18 | Anti-interference circuit board of digital flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620012899 CN2926998Y (en) | 2006-04-18 | 2006-04-18 | Anti-interference circuit board of digital flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2926998Y true CN2926998Y (en) | 2007-07-25 |
Family
ID=38281248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620012899 Expired - Fee Related CN2926998Y (en) | 2006-04-18 | 2006-04-18 | Anti-interference circuit board of digital flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2926998Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882610A (en) * | 2011-07-13 | 2013-01-16 | 上海博泰悦臻电子设备制造有限公司 | Vehicle system and method for eliminating noise |
| CN106231783A (en) * | 2016-08-12 | 2016-12-14 | 深圳崇达多层线路板有限公司 | A kind of printed circuit board reducing inter-signal interference and wiring method |
-
2006
- 2006-04-18 CN CN 200620012899 patent/CN2926998Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882610A (en) * | 2011-07-13 | 2013-01-16 | 上海博泰悦臻电子设备制造有限公司 | Vehicle system and method for eliminating noise |
| CN106231783A (en) * | 2016-08-12 | 2016-12-14 | 深圳崇达多层线路板有限公司 | A kind of printed circuit board reducing inter-signal interference and wiring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Qixinghuachuang Electronic Co., Ltd., Beijing Document name: Notification to Pay the Fees |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070725 Termination date: 20140418 |