CN104614055A - Analog sensor with digital compensation function - Google Patents
Analog sensor with digital compensation function Download PDFInfo
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- CN104614055A CN104614055A CN201310538774.5A CN201310538774A CN104614055A CN 104614055 A CN104614055 A CN 104614055A CN 201310538774 A CN201310538774 A CN 201310538774A CN 104614055 A CN104614055 A CN 104614055A
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Abstract
The invention relates to an analog sensor with a digital compensation function. The analog sensor comprises an elastic body which deforms according to pressure sensed by the analog sensor; a strain gauge which is connected to the elastic body and generates change of resistance according to the deformation; a strain gauge bridge circuit which is connected to the strain gauge and transmits the change of resistance so as to output a first analog signal; an analog-to-digital conversion module which is connected to the output end of the strain gauge bridge circuit of the analog sensor, receives the first analog signal from the strain gauge bridge circuit and converts the first analog signal into a first digital signal, wherein the first analog signal is an analog signal indicting weight; and an analog output port which outputs a second analog signal. The analog sensor further comprises a signal processing and output circuit which is connected between the output end of the analog-to-digital conversion module and the analog output port, compensates the first digital signal and converts the first digital signal into the second analog signal. High-accuracy compensation can be realized, and interfaces of the analog weighing sensor can be kept simple.
Description
Technical field
The present invention relates to LOAD CELLS field, particularly relate to the simulation LOAD CELLS with digital compensation function.
Background technology
Strain chip simulation LOAD CELLS is a kind of comparatively conventional simulation LOAD CELLS.Because nearly all instrument all supports analog sensor, therefore strain chip simulation LOAD CELLS possess interface simple, the advantages such as dynamic weighing occasion can be directly applied to.But traditional strain chip analog sensor adopts the mode of serial or parallel connection resistance on strain gage bridge road to compensate zero point, sensitivity and temperature coefficient, and can only realize once linear and compensate, compensation precision is poor.And the method for analog compensation, cannot solve the error that creep is relevant to time and heap(ed) capacity with delayed grade.
Be directed to this, LOAD CELLS of the prior art receives the simulating signal on the strain gage bridge road of sensor, by this analog signal figure, the weight signal collected and temperature signal (if having) being undertaken calculating to obtain the weight data through compensating by a series of model simultaneously, finally this weight data through compensation being outputted to instrument or other peripheral hardwares by special digital port (such as RS232/485, CANOPEN etc.).
But the shortcoming of this LOAD CELLS is, owing to needing to adopt special digital port to export weight data through compensating, makes the interface of simulating LOAD CELLS become complicated, and limiting the universal connectability of instrument or other peripheral hardwares.
Summary of the invention
The present invention, for solving the above-mentioned problems in the prior art, proposes and a kind ofly can realize high-accuracy compensation, simulation LOAD CELLS interface can be made to keep simply with the simulation LOAD CELLS of digital compensation function again.
According to an aspect of the present invention, provide a kind of analog sensor, comprising: an elastic body, the pressure that described elastic body senses according to described analog sensor and deformation occurs; One foil gauge, described foil gauge is connected to described elastic body and produces the change of resistance value according to described deformation; One strain gage bridge road, described strain gage bridge road is connected to described foil gauge, transmits the change of described resistance value to export the first simulating signal; One analog-to-digital conversion module, be connected to the output terminal on the strain gage bridge road of analog sensor, receive the first simulating signal from described strain gage bridge road, and convert described first simulating signal to first digital signal, wherein, described first simulating signal is the simulating signal representing weight; One modulating output port, export the second simulating signal, wherein, described analog sensor also comprises a signal transacting and output circuit, be connected between the output terminal of described analog-to-digital conversion module and described modulating output port, described first digital signal compensated and converts thereof into described second simulating signal.
According to another aspect of the invention, described signal transacting and output circuit comprise: a compensating module, are connected to the output terminal of described analog-to-digital conversion module, compensate to obtain the first digital signal through compensating to described first digital signal; And a D/A converter module, be connected to the output terminal of described compensating module, receive described the first digital signal through compensating and convert thereof into described second simulating signal.
According to another aspect of the invention, described signal transacting and output circuit comprise: a compensating module, are connected to the output terminal of described analog-to-digital conversion module, compensate to described first digital signal the second digital signal obtaining expression simulating signal amount to be compensated; One D/A converter module, is connected to the output terminal of described compensating module, receives described second digital signal and converts thereof into the 3rd simulating signal; And an operational amplification circuit, be connected to the output terminal on the strain gage bridge road of analog sensor and the output terminal of described D/A converter module, receive described first simulating signal and described 3rd simulating signal generates described second simulating signal to superpose.
According to another aspect of the invention, described signal transacting and output circuit comprise: a compensating module, are connected to the output terminal of described analog-to-digital conversion module, compensate to obtain simulating signal amount to be compensated to described first digital signal; One pulse width modulation module, is connected to the output terminal of described compensating module, carries out width modulation to obtain the 4th simulating signal with square wave to simulating signal amount to be compensated; And an adding circuit, be connected to the output terminal on the strain gage bridge road of analog sensor and the output terminal of described pulse width modulation module, receive described first simulating signal and described 4th simulating signal generates described second simulating signal to superpose.
According to another aspect of the invention, described analog sensor also comprises a temperature sensor, the output terminal of described temperature sensor is connected to an input end of described analog-to-digital conversion module, the simulating signal of described temperature sensor acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module to, wherein, the simulating signal of described expression temperature is converted into described first digital signal together with described first simulating signal.
According to another aspect of the invention, described analog sensor also comprises a diagnostic module, described diagnostic module is connected between an output terminal of described analog-to-digital conversion module and an input end of described signal transacting and output circuit, analyzes described first simulating signal to obtain the diagnostic state data of the duty representing described analog sensor and described diagnostic state data are sent to described signal transacting and output circuit.
According to another aspect of the invention, described analog sensor also comprises: a temperature sensor, the output terminal of described temperature sensor is connected to an input end of described analog-to-digital conversion module, the simulating signal of described temperature sensor acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module to, the simulating signal of described expression temperature is converted into described first digital signal together with described first simulating signal; And a diagnostic module, described diagnostic module is connected between an output terminal of described analog-to-digital conversion module and an input end of described signal transacting and output circuit, analyzes described first simulating signal to obtain the diagnostic state data of the duty representing described analog sensor and described diagnostic state data are sent to described signal transacting and output circuit.
According to another aspect of the invention, described analog sensor also comprises a digital output port, described signal transacting and output circuit also comprise a transport module, described transport module is connected between the output terminal of described diagnostic module and described digital output port, for transmitting described diagnostic state data.
According to another aspect of the invention, described analog sensor also comprises a digital output port, described signal transacting and output circuit also comprise a transport module, described transport module is connected between the output terminal of described diagnostic module and described digital output port, for transmitting described diagnostic state data.
The present invention not only can introduce temperature compensation, creep and lag compensation in simulation LOAD CELLS, realizes high-precision simulation weighing-up wave and exports.The advantage that the interface of simulation LOAD CELLS keeps simple, general, dynamic following performance is good can be made again simultaneously.In addition, the microprocessor in simulation LOAD CELLS of the present invention can also carry out diagnostic analysis to working sensor state, and by data-out port and peripheral hardware communication, provides additional digital function.
Should be appreciated that more than the present invention generality describe and the following detailed description be all exemplary and explanat, and be intended to for as claimed in claim the invention provides further explanation.
Accompanying drawing explanation
Comprising accompanying drawing is further understand the present invention for providing, and they are included and form a application's part, and accompanying drawing shows embodiments of the invention, and plays the effect explaining the principle of the invention together with this instructions.In accompanying drawing:
Fig. 1 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Fig. 2 is the signal transacting of analog sensor and the schematic diagram of output circuit according to an embodiment of the invention.
Fig. 3 is the schematic diagram of signal transacting according to the analog sensor of further embodiment of this invention and output circuit.
Fig. 4 is the schematic diagram of signal transacting according to the analog sensor of further embodiment of this invention and output circuit.
Fig. 5 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Fig. 6 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Fig. 7 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Fig. 8 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Fig. 9 is the schematic diagram of the analog sensor according to one embodiment of the invention.
Embodiment
With detailed reference to accompanying drawing, embodiments of the invention are described now.
Fig. 1 is the schematic diagram of the analog sensor according to one embodiment of the invention.As shown in Figure 1, analog sensor 100 comprises: an elastic body 102, the pressure that described elastic body senses according to described analog sensor and deformation occurs; One foil gauge 104, described foil gauge is connected to described elastic body and produces the change of resistance value according to described deformation; One strain gage bridge road 106, described strain gage bridge road is connected to described foil gauge, transmits the change of described resistance value to export the first simulating signal; One analog-to-digital conversion module 108, be connected to the output terminal on the strain gage bridge road of analog sensor, receive the first simulating signal from described strain gage bridge road, and convert described first simulating signal to first digital signal, wherein, described first simulating signal is the simulating signal representing weight; One modulating output port 116, exports the second simulating signal.Described analog sensor also comprises a signal transacting and output circuit 110, is connected between the output terminal of described analog-to-digital conversion module 108 and described modulating output port 116, compensates and convert thereof into described second simulating signal to described first digital signal.
Analog sensor 100 shown in Fig. 1 also comprises digital output port 118, and the output of signal transacting and output circuit 110 is also exported by digital output port 118.In one embodiment, digital output port 118 according to the needs of user, can export digital weighing information.
Fig. 2 is the signal transacting of analog sensor and the schematic diagram of output circuit according to an embodiment of the invention.Signal transacting and output circuit 110 comprise: a compensating module 212, are connected to described analog-to-digital conversion module 108(and see Fig. 1) output terminal, described first digital signal is compensated to obtain the first digital signal through compensating; And a D/A converter module 214, be connected to the output terminal of described compensating module 212, receive described the first digital signal through compensating and convert thereof into described second simulating signal.Second simulating signal is shown in Fig. 1 further by modulating output port 116() export.
Fig. 3 is the schematic diagram of signal transacting according to the analog sensor of further embodiment of this invention and output circuit.Signal transacting and output circuit 110 comprise: a compensating module 312, are connected to the output terminal of described analog-to-digital conversion module 108, compensate to described first digital signal the second digital signal obtaining expression simulating signal amount to be compensated; One D/A converter module 314, is connected to the output terminal of described compensating module 312, receives described second digital signal and converts thereof into the 3rd simulating signal; And an operational amplification circuit 316, be connected to the output terminal on the strain gage bridge road 106 of analog sensor and the output terminal of described D/A converter module 314, receive described first simulating signal and described 3rd simulating signal and generate described second simulating signal to superpose.Second simulating signal is shown in Fig. 1 further by modulating output port 116() export.
Fig. 4 is the schematic diagram of signal transacting according to the analog sensor of further embodiment of this invention and output circuit.Signal transacting and output circuit 110 comprise: a compensating module 412, are connected to the output terminal of described analog-to-digital conversion module 108, compensate to obtain simulating signal amount to be compensated to described first digital signal; One pulse width modulation module 414, is connected to the output terminal of described compensating module 412, carries out width modulation to obtain the 4th simulating signal with square wave to simulating signal amount to be compensated; And an adding circuit 416, be connected to the output terminal on the strain gage bridge road 106 of analog sensor and the output terminal of described pulse width modulation module 414, receive described first simulating signal and described 4th simulating signal generates described second simulating signal to superpose.Second simulating signal is shown in Fig. 1 further by modulating output port 116() export.
Fig. 5 is the schematic diagram of the analog sensor according to one embodiment of the invention.Analog sensor 500 shown in Fig. 5 is only with the difference of the analog sensor 100 shown in Fig. 1, analog sensor 500 also comprises a temperature sensor 502, the output terminal of described temperature sensor 502 is connected to an input end of described analog-to-digital conversion module 508, the simulating signal of described temperature sensor 502 acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module 508 to, wherein, the simulating signal of described expression temperature converts described first digital signal to by analog-to-digital conversion module 508 together with described first simulating signal.Signal transacting shown in Fig. 5 and output circuit 510 also can as shown in each embodiment of the signal transacting of Fig. 2-4 and output circuit 110 have various different implementation.The miscellaneous part of Fig. 5 and function are all corresponding with Fig. 1 and similar, do not repeat them here.
Fig. 6 is the schematic diagram of the analog sensor according to one embodiment of the invention.Analog sensor 600 shown in Fig. 6 is with the difference of the analog sensor 100 shown in Fig. 1, analog sensor 600 also comprises a diagnostic module 604, described diagnostic module 604 is connected between an output terminal of described analog-to-digital conversion module 108 and an input end of described signal transacting and output circuit 610, analyzes described first simulating signal to obtain the diagnostic state data of the duty representing described analog sensor and described diagnostic state data are sent to described signal transacting and output circuit 610.Analog sensor 600 shown in Fig. 6 is also with the difference of the analog sensor 100 shown in Fig. 1, signal transacting and output circuit 610 comprise: a compensating module 612, being connected to the output terminal of described analog-to-digital conversion module 108, compensating to obtain the first digital signal through compensating to described first digital signal; One D/A converter module 614, is connected to the output terminal of described compensating module 612, receives described the first digital signal through compensation and converts thereof into described second simulating signal; And a transport module 616, between the output terminal being connected to described diagnostic module 604 and digital output port 118, for transmitting described diagnostic state data.The miscellaneous part of Fig. 6 and function are all corresponding with Fig. 1 and similar, do not repeat them here.
Fig. 7 is the schematic diagram of the analog sensor according to one embodiment of the invention.Analog sensor 600 shown in Fig. 7 is with the difference of the analog sensor 600 shown in Fig. 6, analog sensor 600 also comprises a temperature sensor 702, the output terminal of described temperature sensor 702 is connected to an input end of described analog-to-digital conversion module 708, the simulating signal of described temperature sensor 702 acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module 708 to, wherein, the simulating signal of described expression temperature converts described first digital signal to by analog-to-digital conversion module 708 together with described first simulating signal.The miscellaneous part of Fig. 7 and function are all corresponding with Fig. 6 and similar, do not repeat them here.
Fig. 8 is the schematic diagram of the analog sensor according to one embodiment of the invention.Analog sensor 800 shown in Fig. 8 is with the difference of the analog sensor 700 shown in Fig. 7, and the signal transacting shown in Fig. 8 and output circuit 810 are different from the signal transacting shown in Fig. 7 and output circuit 710.Specifically, signal transacting and output circuit 810 comprise: a compensating module 812, are connected to the output terminal of described analog-to-digital conversion module 808, compensate to described first digital signal the second digital signal obtaining expression simulating signal amount to be compensated; One D/A converter module 814, is connected to the output terminal of described compensating module 812, receives described second digital signal and converts thereof into the 3rd simulating signal; One operational amplification circuit 816, is connected to the output terminal on the strain gage bridge road 106 of analog sensor and the output terminal of described D/A converter module 814, receives described first simulating signal and described 3rd simulating signal and generates described second simulating signal to superpose; And a transport module 816, between the output terminal being connected to described diagnostic module 804 and digital output port 118, for transmitting described diagnostic state data.The miscellaneous part of Fig. 8 and function are all corresponding with Fig. 7 and similar, do not repeat them here.
Fig. 9 is the schematic diagram of the analog sensor according to one embodiment of the invention.Analog sensor 900 shown in Fig. 9 is with the difference of the analog sensor 700 shown in Fig. 7, and the signal transacting shown in Fig. 9 and output circuit 910 are different from the signal transacting shown in Fig. 7 and output circuit 710.Specifically, signal transacting and output circuit 910 comprise: a compensating module 912, are connected to the output terminal of described analog-to-digital conversion module 908, compensate to obtain simulating signal amount to be compensated to described first digital signal; One pulse width modulation module 914, is connected to the output terminal of described compensating module 912, carries out width modulation to obtain the 4th simulating signal with square wave to simulating signal amount to be compensated; One adding circuit 916, is connected to the output terminal on the strain gage bridge road 106 of analog sensor and the output terminal of described pulse width modulation module 914, receives described first simulating signal and described 4th simulating signal and generates described second simulating signal to superpose; And a transport module 916, between the output terminal being connected to described diagnostic module 904 and digital output port 118, for transmitting described diagnostic state data.The miscellaneous part of Fig. 9 and function are all corresponding with Fig. 7 and similar, do not repeat them here.
Those skilled in the art can be obvious, can carry out various modifications and variations and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop within the scope of appended claims and equivalent arrangements thereof to amendment of the present invention and modification.
Claims (9)
1. an analog sensor, comprising:
One elastic body (102), the pressure that described elastic body senses according to described analog sensor and deformation occurs;
One foil gauge (104), described foil gauge is connected to described elastic body and produces the change of resistance value according to described deformation;
One strain gage bridge road (106), described strain gage bridge road is connected to described foil gauge, transmits the change of described resistance value to export the first simulating signal;
One analog-to-digital conversion module (108), be connected to the output terminal on the strain gage bridge road of analog sensor, receive the first simulating signal from described strain gage bridge road, and convert described first simulating signal to first digital signal, wherein, described first simulating signal is the simulating signal representing weight;
One modulating output port (116), exports the second simulating signal,
It is characterized in that,
Described analog sensor also comprises a signal transacting and output circuit (110), be connected between the output terminal of described analog-to-digital conversion module (108) and described modulating output port (116), described first digital signal compensated and converts thereof into described second simulating signal.
2. analog sensor as claimed in claim 1, it is characterized in that, described signal transacting and output circuit (110) comprising:
One compensating module (212), is connected to the output terminal of described analog-to-digital conversion module (108), compensates to obtain the first digital signal through compensating to described first digital signal; And
One D/A converter module (214), is connected to the output terminal of described compensating module (212), receives described the first digital signal through compensation and converts thereof into described second simulating signal.
3. analog sensor as claimed in claim 1, it is characterized in that, described signal transacting and output circuit (110) comprising:
One compensating module (312), is connected to the output terminal of described analog-to-digital conversion module (108), compensates to described first digital signal the second digital signal obtaining expression simulating signal amount to be compensated;
One D/A converter module (314), is connected to the output terminal of described compensating module (312), receives described second digital signal and converts thereof into the 3rd simulating signal; And
One operational amplification circuit (316), be connected to the output terminal on the strain gage bridge road (106) of analog sensor and the output terminal of described D/A converter module (314), receive described first simulating signal and described 3rd simulating signal and generate described second simulating signal to superpose.
4. analog sensor as claimed in claim 1, it is characterized in that, described signal transacting and output circuit (110) comprising:
One compensating module (412), is connected to the output terminal of described analog-to-digital conversion module (108), compensates to obtain simulating signal amount to be compensated to described first digital signal;
One pulse width modulation module (414), is connected to the output terminal of described compensating module (412), carries out width modulation to obtain the 4th simulating signal with square wave to simulating signal amount to be compensated; And
One adding circuit (416), be connected to the output terminal on the strain gage bridge road (106) of analog sensor and the output terminal of described pulse width modulation module (414), receive described first simulating signal and described 4th simulating signal and generate described second simulating signal to superpose.
5. the analog sensor as described in any one of claim 1-4, it is characterized in that, described analog sensor also comprises a temperature sensor (502), the output terminal of described temperature sensor (502) is connected to an input end of described analog-to-digital conversion module (508), the simulating signal of described temperature sensor (502) acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module (508) to
Wherein, the simulating signal of described expression temperature is converted into described first digital signal together with described first simulating signal.
6. the analog sensor as described in any one of claim 1-4, it is characterized in that, described analog sensor also comprises a diagnostic module (604), described diagnostic module (604) is connected between an output terminal of described analog-to-digital conversion module (108) and an input end of described signal transacting and output circuit (610), analyzes described first simulating signal to obtain the diagnostic state data of the duty representing described analog sensor and described diagnostic state data are sent to described signal transacting and output circuit (610).
7. the analog sensor as described in any one of claim 1-4, is characterized in that, described analog sensor also comprises:
One temperature sensor (702), the output terminal of described temperature sensor (702) is connected to an input end of described analog-to-digital conversion module (708), the simulating signal of described temperature sensor (702) acquisition tables temp. displaying function and export the input end of described analog-to-digital conversion module (708) to, the simulating signal of described expression temperature is converted into described first digital signal together with described first simulating signal; And
One diagnostic module (704), described diagnostic module (704) is connected between an output terminal of described analog-to-digital conversion module (708) and an input end of described signal transacting and output circuit (710), analyzes described first simulating signal to obtain the diagnostic state data of the duty representing described analog sensor and described diagnostic state data are sent to described signal transacting and output circuit (710).
8. analog sensor as claimed in claim 6, it is characterized in that, described analog sensor also comprises a digital output port (118), described signal transacting and output circuit (610) also comprise a transport module (616), described transport module (616) is connected between the output terminal of described diagnostic module (604) and described digital output port (118), for transmitting described diagnostic state data.
9. analog sensor as claimed in claim 7, it is characterized in that, described analog sensor also comprises a digital output port (118), described signal transacting and output circuit (710,810,910) also comprise a transport module (716,816,916), between the output terminal that described transport module (716,816,916) is connected to described diagnostic module (704,804,904) and described digital output port (118), for transmitting described diagnostic state data.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310538774.5A CN104614055B (en) | 2013-11-01 | 2013-11-01 | Simulation weighing sensor with digital compensation function |
| EP14858032.7A EP3063514B1 (en) | 2013-11-01 | 2014-10-31 | Analog sensor with digital compensation function |
| PCT/CN2014/089984 WO2015062535A1 (en) | 2013-11-01 | 2014-10-31 | Analog sensor with digital compensation function |
| US15/134,087 US10215617B2 (en) | 2013-11-01 | 2016-04-20 | Analog sensor with digital compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310538774.5A CN104614055B (en) | 2013-11-01 | 2013-11-01 | Simulation weighing sensor with digital compensation function |
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| CN104614055A true CN104614055A (en) | 2015-05-13 |
| CN104614055B CN104614055B (en) | 2017-11-10 |
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| CN201310538774.5A Active CN104614055B (en) | 2013-11-01 | 2013-11-01 | Simulation weighing sensor with digital compensation function |
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