CN203587213U - Electronic scale - Google Patents
Electronic scale Download PDFInfo
- Publication number
- CN203587213U CN203587213U CN201320699359.3U CN201320699359U CN203587213U CN 203587213 U CN203587213 U CN 203587213U CN 201320699359 U CN201320699359 U CN 201320699359U CN 203587213 U CN203587213 U CN 203587213U
- Authority
- CN
- China
- Prior art keywords
- electronic scales
- core circuit
- circuit plate
- metallic shield
- electromagnetic interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005484 gravity Effects 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract 5
- 238000000034 method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001465977 Coccoidea Species 0.000 description 1
- 206010040844 Skin exfoliation Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model provides an electronic scale which comprises a housing, a gravity inductor and a core circuit board. The core circuit board comprises an A/D conversion module. A first metal shielding cover is arranged on the periphery of the A/D conversion module. According to the utility model, the metal shielding cover is arranged on the periphery of the A/D conversion module, so that the A/D conversion module is prevented from being influenced by electromagnetic interference from parts outside the core circuit board and from other circuits except the A/D conversion module on the core circuit board, so that the main sources of the errors of the electronic scale are eliminated, and the weighing accuracy of the electronic scale is ensured.
Description
Technical field
The utility model relates to a kind of weighing apparatus, relates in particular to a kind of electronic scales.
Background technology
Electronic scales has feature easy and simple to handle, and therefore application is very extensive.It mainly, by parts such as base, housing, gravity sensor and core circuit plate, weighing pan, guidance panels, is provided with amplifying circuit, A/D D/A converting circuit, display circuit, mu balanced circuit, central processor CPU etc. on core circuit plate.Its workflow is: first, object is placed on weighing pan, the pressure that article produce passes to gravity sensor, makes gravity sensor generation deformation, thereby impedance is changed; Then, driving voltage changes, the simulating signal of a variation of output, and this signal amplifies and outputs to A/D converter through amplifying circuit, is input to CPU and carries out calculation process after converting the digital signal of being convenient to process to; Finally, CPU exports this result according to keyboard commands and program by display.
Because gravity sensor, A/D module can be easy to be subject to the interference of electromagnetism, for guarantee electronic scales accurately, need to carry out to electronic scales design or the processing of anti-electromagnetic interference (EMI).In prior art, avoid the mode of electronic scales electromagnetic interference (EMI) to mainly contain two kinds: 1, in the one or both sides of core circuit plate, barricade to be set; 2, circuit is optimized.Wherein, mode 1 is mainly used in external electromagnetic interference (EMI) to shield, and mode 2 is mainly used in avoiding in the inner electromagnetic interference (EMI) that produces of electronic scales.
Realizing in process of the present utility model, the application's utility model people finds that the mode that available technology adopting barricade shields external electromagnetic interference (EMI) at least exists following problem: because sheet metal can not seal core circuit plate completely, cause electronic scales still can receive the electromagnetic interference (EMI) from core circuit plate outside, and the sheet metal that is arranged on core circuit plate periphery can not be avoided the electromagnetic interference (EMI) between each functional circuit on core circuit plate, still likely cause weighing of electronic scales inaccurate.
Utility model content
The utility model provides a kind of electronic scales, can reduce the impact of the weighing results on electronic scales from the electromagnetic interference (EMI) producing on the electromagnetic interference (EMI) of core circuit plate outside and core circuit plate.
The utility model provides a kind of electronic scales, comprises housing, gravity sensor, core circuit plate, and core circuit plate comprises A/D modular converter, and described A/D modular converter periphery is provided with the first metallic shield.
Preferably, described electronic scales also comprises the first ground wire, and this first ground wire is connected with the first metallic shield.
Preferably, described core circuit periphery is provided with the second metallic shield.
Preferably, on described the second metallic shield, be provided with at least one louvre.
Preferably, described electronic scales also comprises the second ground wire, and this second ground wire is connected with the second metallic shield.
Preferably, on described core circuit plate, be provided with acp chip, and at each I/O I/O of acp chip mouth, pull-up resistor be set.
Preferably, described electronic scales also comprises a power module, and the power supply chip of the described power module power supply chip that is anti-electromagnetic interference (EMI).
Preferably, the power lead in described electronic scales and/or data line adopt Copper Foil parcel, and establish and be equipped with magnet ring at power lead and/or data line.
In the utility model, by a metallic shield is set in the periphery of A/D modular converter, can avoid the impact on A/D modular converter from electromagnetic interference (EMI) that on the electromagnetic interference (EMI) of core circuit plate outside and core circuit plate, other circuit except A/D modular converter produce, thereby eliminated the main source of electronic scales error, guaranteed the accuracy of electronic scale weighing.
Accompanying drawing explanation
The diagrammatic cross-section of the core circuit plate of a kind of electronic scales that Fig. 1 provides for the utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
The utility model provides a kind of electronic scales, and as shown in Figure 1, this electronic scales comprises:
Comprise housing, gravity sensor, core circuit plate, core circuit plate comprises A/D modular converter, and the periphery of A/D modular converter 1 is provided with the first metallic shield 2.
In practical application, on housing, display screen can be set, keyboard etc., except A/D module 1, can also comprise print module on core circuit plate, and the module that the electronic scaless of the prior art such as valuation module, bar-code identification module adopt conventionally, does not repeat them here.
Realizing in process of the present utility model, the application finds through a large amount of tests and statistics, A/D modular converter is the main source that produces error after electronic scales is interfered, on this basis, present inventor arranges a metallic shield in A/D modular converter periphery, so not only well avoided interference source from core circuit plate outside (can comprise the electromagnetic interference (EMI) in the wireless environment at electronic scales place, the electromagnetic interference (EMI) producing with other circuit except core circuit plate in electronic scales or module) impact on A/D modular converter, also can avoid the electromagnetic interference (EMI) that on core circuit plate, other modules except A/D modular converter produce (such as the display module for controlling display screen is when generation control signal is controlled display screen, or for the print module of controlling printer when producing control signal printer controlled, or while being created in transmitting high-frequency signal with power lead in electronic scales or data line, all likely produce electromagnetic interference (EMI)) impact on A/D modular converter, guaranteed that A/D modular converter moves under the environment without electromagnetic interference (EMI), eliminated the main source of electronic scales error, guarantee the accuracy of electronic scale weighing.
Further, electronic scales can also comprise first ground wire, and this first ground wire is connected with the first metallic shield 2.In this way, can make the first metallic shield 2 ground connection, thereby the voltage of the first metallic shield 2 and the earth are consistent, for the A/D modular converter 1 in the first metallic shield 2 provides stable working environment.
Further, second metallic shield can also be set in core circuit plate periphery.In this way, can be by the electromagnetic interference shield from core circuit plate outside, for the modules on core circuit plate provides a metastable working environment.
Further, on this second metallic shield, at least one louvre can also be set.In this way, can accelerate the diffusion of the heat of core circuit plate generation, guarantee the temperature environment of modules work on core circuit plate.
Further, in core circuit plate periphery, arrange on the basis of the second metallic shield, second ground wire can also be set, this second ground wire is connected with the second metallic shield, for by the second metallic shield ground connection, improve the effect of the second metallic shield shield electromagnetic interference.
In practical application, core circuit plate generally also should comprise acp chip, and this acp chip is installed on the core processor of this electronic scales.In the embodiment that the utility model provides, the model of selected chip is LPC1766, can greatly promote the operational performance of core processor.Further, at each I/O port of acp chip, increase pull-up resistor, guarantee that each I/O port of kernel processor chip is in a stable state, increase the stability of kernel processor chip.In this way, also can further improve the accuracy of electronic scale weighing.
Further, in the embodiment that the utility model provides, electronic scales can also comprise that a power supply chip is the power module of anti-electromagnetic interference (EMI) chip, in this way, the voltage instability that causes power supply to provide because of electromagnetic interference (EMI) can be provided, and then the electronic scales causing restarts, guaranteed that electronic scales can steady operation.
In practical application, except mainboard, core circuit plate also can comprise LED display, keypad etc., and core circuit plate is connected by power lead or data line with LED display, keypad, power supply etc.In this novel embodiment providing, the impact of the electromagnetic interference (EMI) producing when the transmitting high-frequency signal for fear of power lead or data line on the modules in electronic scales or circuit, adopts Copper Foil parcel by power lead and/or data line.Meanwhile, the impact for fear of the electromagnetic interference (EMI) of power lead or data line outside on corresponding power lead or data line can be equipped with magnet ring on power lead or data line.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. an electronic scales, comprises housing, gravity sensor, core circuit plate, and core circuit plate comprises A/D modular converter, it is characterized in that, described A/D modular converter periphery is provided with the first metallic shield.
2. electronic scales as claimed in claim 1, is characterized in that, also comprises the first ground wire, and this first ground wire is connected with the first metallic shield.
3. electronic scales as claimed in claim 1, is characterized in that,
Described core circuit periphery is provided with the second metallic shield.
4. electronic scales as claimed in claim 3, is characterized in that,
On described the second metallic shield, be provided with at least one louvre.
5. electronic scales as claimed in claim 3, is characterized in that, also comprises the second ground wire, and this second ground wire is connected with the second metallic shield.
6. electronic scales as claimed in claim 1, is characterized in that, on described core circuit plate, is provided with acp chip, and at each I/O port of acp chip, pull-up resistor is set.
7. electronic scales as claimed in claim 1, is characterized in that, also comprises a power module, and the power supply chip of the described power module power supply chip that is anti-electromagnetic interference (EMI).
8. the electronic scales as described in claim 1-6 any one, is characterized in that, the power lead in described electronic scales and/or data line adopt Copper Foil parcel, and establishes and be equipped with magnet ring at power lead and/or data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699359.3U CN203587213U (en) | 2013-11-06 | 2013-11-06 | Electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699359.3U CN203587213U (en) | 2013-11-06 | 2013-11-06 | Electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203587213U true CN203587213U (en) | 2014-05-07 |
Family
ID=50585116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320699359.3U Expired - Lifetime CN203587213U (en) | 2013-11-06 | 2013-11-06 | Electronic scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203587213U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318952A (en) * | 2014-07-30 | 2016-02-10 | 徐亚珍 | Heat radiating electronic scale display casing |
| CN105318951A (en) * | 2014-07-30 | 2016-02-10 | 徐亚珍 | Full heat radiating electronic scale display casing |
-
2013
- 2013-11-06 CN CN201320699359.3U patent/CN203587213U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318952A (en) * | 2014-07-30 | 2016-02-10 | 徐亚珍 | Heat radiating electronic scale display casing |
| CN105318951A (en) * | 2014-07-30 | 2016-02-10 | 徐亚珍 | Full heat radiating electronic scale display casing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |
|
| CX01 | Expiry of patent term |