CN103234617A - Remote-control digital weighing machine with temperature compensation function and temperature compensation method for remote-control digital weighing machine - Google Patents
Remote-control digital weighing machine with temperature compensation function and temperature compensation method for remote-control digital weighing machine Download PDFInfo
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Abstract
The invention relates to a remote-control digital weighing machine with a temperature compensation function and a temperature compensation method for the remote-control digital weighing machine. The remote-control digital weighing machine comprises a weighing sensor, an AD (analog and digital) conversion module, a CPU (central processing unit), an external DSP (digital signal processing) display, an interface circuit, a temperature compensation circuit, an external voltage testing circuit, a keyboard circuit, a wireless communication module, a power supply and a DC-DC charge pump of a stabilized voltage supply; an equal-arm bridge of the weighing sensor comprises four resistance strain gauges, and various components are powered by the power supply and the DC-DC charge pump of the stabilized voltage supply; after force signals detected by the weighing sensor are converted into analog electric signals, the analog electric signals are inputted into the AD conversion module and are converted into digital signals, and the digital signals are inputted into the CPU to be processed, so that a weight value of a measured object is obtained; output ends of the CPU are respectively connected with the external DSP display and the interface circuit, an input end of the CPU is connected with the temperature compensation circuit, and another output end of the CPU is connected with the wireless communication module; the power supply outputs two power supply channels via the DC-DC charge pump of the stabilized voltage supply, and the AD conversion module and the CPU are respectively powered by the two power supply channels. The remote-control digital weighing machine and the temperature compensation method can be applied to different service places.
Description
Technical field
The present invention relates to a kind of weighing apparatus and temp compensation method thereof, particularly about the digital weighing apparatus of a kind of remote control temperature compensation and temp compensation method thereof.
Background technology
At present, electronic scales generally is made up of LOAD CELLS (comprising simulation LOAD CELLS or digital LOAD CELLS) and weighing instrument, is separated from each other between LOAD CELLS and the weighing instrument, and the power supply of LOAD CELLS is supplied with by weighing instrument.After LOAD CELLS is stressed, by circuit faint signal is sent to secondary instrument and handles.The feeble signal of LOAD CELLS output has decay, and is subjected to electromagnetic interference (EMI) easily in the circuit transmission course, same secondary instrument also makes moist outside easily, is subjected to the interference of electromagnetic field.Digital LOAD CELLS antijamming capability increases, but digital LOAD CELLS still must external instrument, and inside has CPU and software etc. just can finish the function of electronic scales.
And because LOAD CELLS is the equal arm bridge of a precision, when stressed, be attached to the foil gauge resistance generation subtle change on the elastic body, the electric bridge out of trim, output signal is just arranged, be example with conventional 350 Europe sensors, foil gauge change in resistance 0.0001 Ω will produce 1/3000 error, and visible LOAD CELLS is so high to the stability requirement of foil gauge, when in fact sensor changes in-10 °～+ 40 ° scopes, can produce very big temperature zero drift, and be at random, have just have negative, each temperature section drift value is inconsistent, is difficult to find that a hardware temperature compensation device can fine compensation in the total temperature scope.In fact, according to the result of country's selective examination electronic scale sensor, the temperature drift is underproof to occupy the majority.
In addition, the signal output of LOAD CELLS can be subjected to Temperature Influence, so each LOAD CELLS will carry out the hardware temperatures compensation through complicated technology, and requirement just might be up to state standards.When some industrial electronic scales use at the scene, need backguy to the pulpit, reading can not be directly seen at the existence scene, can not operate at the scene defectives such as demarcation.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of digital weighing apparatus of remote control temperature compensation and temp compensation method thereof that electromagnetic interference (EMI) can effectively be overcome, have temperature compensation function.
For achieving the above object, the present invention takes following technical scheme: the digital weighing apparatus of a kind of remote control temperature compensation, it is characterized in that: it comprises LOAD CELLS, AD modular converter, CPU, external DSP display, interface circuit, temperature-compensation circuit, external voltage test circuit, keyboard circuit, the wireless communication module that is made of equal arm bridge four resistance strain gages, and is power supply and the stabilized voltage supply DC-DC charge pump of each parts power supply; After described LOAD CELLS is converted to analog electrical signal with detected force signal, imports described AD modular converter analog electrical signal is converted to digital signal, and import the gravimetric value that obtains testee after handling in the described CPU; The output terminal of described CPU connects described external DSP display and interface circuit, and the input end of described CPU connects described temperature-compensation circuit, and the output terminal of described CPU also connects described wireless communication module; Described power supply is respectively described AD modular converter and CPU power supply by described stabilized voltage supply DC-DC charge pump output two-way power supply.
Be built-in with 8 tunnel AD converter among the described CPU, wherein three the tunnel connect described temperature-compensation circuit, external voltage test circuit and keyboard circuit respectively; Described temperature-compensation circuit after described 8 tunnel AD converter, is imported detected operating ambient temperature value to carry out temperature compensation in the storer among the described CPU; Described external voltage test circuit is for detection of the supply voltage of described power supply, and after described 8 tunnel AD converter storer among the described CPU of input, detect described power supply power supply state; The push button signalling that described keyboard circuit is imported the outside is also imported the storer among the described CPU after described 8 tunnel AD converter, input in the described CPU storer by the parameter of described keyboard circuit with temperature zero drift and temperature span drift; Thermistor temp-resistance the table of comparisons, temperature drift and the temperature span drift curve that are provided by thermistor producer also are provided in the storer among the described CPU.
Described temperature-compensation circuit comprises measuring resistance and as the SMD thermistor of temperature element, output signal after described measuring resistance and the series connection of SMD thermistor, in the described CPU storer of input, compare with the thermistor temp-resistance table of comparisons that is preset in the described CPU storer after 8 tunnel AD converter in described CPU.
Described power supply adopts 5V～2.5V direct current supply.
Described AD modular converter adopts 24 octal encapsulation conversion chip HX710, and around described AD modular converter, be provided with paster LC element and the screen layer that absorbs electromagnetic interference (EMI), and adopting AD sampling and wireless receiving and dispatching timesharing partition method, described timesharing partition method adopts the software second-order filter.
Described CPU adopts the chip of the high speed 1T TSSOP-20 microencapsulated of STC Corporation; Described external DSP display adopts LCD, LED, VFD or MCD display.
Temp compensation method as the above-mentioned digital weighing apparatus of a kind of remote control temperature compensation, its compensation method is as follows: (1) described AD modular converter is imported detected described LOAD CELLS weight signal among the described CPU, carry out one section or the fixed linearization process of five segment marks by the AD weight signal of described CPU, after fixed through one section or five segment marks, the temperature drift of LOAD CELLS and temperature span drift curve are solidificated in the storer of described CPU; (2) temperature zero compensation: the temperature drift and the temperature range curve that preset in the described CPU storer are divided ten districts in-10 ℃～+ 40 ℃ scopes, each district is 6.4 degree, be divided into 64 compensation steps, be divided into 640 compensation blocks again in each compensation step; Code value in the zero-bit AD of the working temperature of the LOAD CELLS that described 8 tunnel AD converter will record by described temperature-compensation circuit, be directly inputted in the storer of described CPU, at first in temperature-resistance table of comparisons, find corresponding temperature value, then with the compensation block that this temperature value finds in the corresponding compensation step on temperature drift curve and it approaches, the variation at compensation temperature zero point automatically; (3) temperature span compensation: the temperature span drift of described LOAD CELLS and the material of Weighing sensor elastomer and foil gauge have main relation, by recording the drift value of described weighing and sensing actuator temperature range, and be input in the storer of described CPU by described interface circuit or the keyboard circuit drift value with record, temperature according to test, calculate the span compensation value of this temperature by the built-in computation model of CPU, revised and get final product.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention is owing to adopt major function with weighing instrument to be integrated in a less circuit board (for example 1.6 * 1.6cm double-sided printed-circuit board) to go up and be encapsulated in the LOAD CELLS, there is not LOAD CELLS to be connected with external cable between the weighing instrument, do not have the decay of signal transmission, overcome electromagnetic interference (EMI).2, temperature-compensation circuit of the present invention adopts the paster thermistor as temperature element, and in built-in 8 tunnel AD converter of CPU, wherein one tunnel resistance to thermistor detects, by being preset at the temperature-resistance table of comparisons in the CPU, adopt computation of table lookup to obtain the exact value of environment temperature, and the curve by sensor temperature drift curve and temperature span drift, divide 10 warm areas, each warm area 6.4 degree, several a tree name pieces of 640 temperature compensations altogether, according to the temperature that records, obtain temperature zero-bit and the temperature span compensation value that will compensate, revise the error that causes owing to temperature effect, reach the purpose of high-acruracy survey, and then the qualification rate of sensor is improved greatly.The present invention can use in different use occasions.
Description of drawings
Fig. 1 is one-piece construction synoptic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, the digital weighing apparatus of a kind of remote control temperature compensation provided by the invention is that weighing instrument is arranged on (for example 1.6 * 1.6cm double-sided printed-circuit board) on the less double-sided printed-circuit board, and is packaged with various sensors.The present invention includes the LOAD CELLS 1, AD modular converter 2, microprocessor (CPU) 3, external DSP display 4, interface circuit 5, temperature-compensation circuit 6, external voltage test circuit 7, keyboard circuit 8, the wireless communication module 9 that are constituted equal arm bridge by four resistance strain gages, and be power supply 10 and the stabilized voltage supply DC-DC charge pump 11 of above-mentioned each parts power supply.
After LOAD CELLS 1 was converted to analog electrical signal with detected force signal, input AD modular converter 2 was converted to digital signal with analog electrical signal, and obtains the gravimetric value of testee after handling in the input CPU3.The output terminal of CPU3 connects external DSP display 4 and interface circuit 5, can external other equipment by interface circuit 5, carry out connected network communication, and a tree names transmit and man-machine conversation number.The input end of CPU3 connects temperature-compensation circuit 6, realizes that by temperature-compensation circuit 6 measuring-signal that CPU3 is received carries out temperature zero compensation and temperature span compensation.The output terminal of CPU3 also connects wireless communication module 9, can realize multiple communication modes by wireless communication module 9, sending function, receiving function or receipts/send out function for example, and can realize that several data sends form, can also arrange ID number, realize multiple combined network communication function, can arrange and show sign indicating number, need not external display, can be on PC directly demonstration data and function.
In above-described embodiment, the present invention adopts and be built-in with 8 tunnel AD converter (not shown)s in CPU3, wherein three the tunnel is respectively applied to connect temperature-compensation circuit 6, external voltage test circuit 7 and keyboard circuit 8.Temperature-compensation circuit 6 after 8 tunnel AD converter, in the storer among the input CPU3, carries out temperature compensation with detected operating ambient temperature value; External voltage test circuit 7 is for detection of the supply voltage of power supply 10, and after 8 tunnel AD converter storer of input among the CPU3, CPU3 judges whether and need charge to adopting battery powered power supply 10 according to detected power supply 10 voltage signals, and then the serviceable life of protection power supply 10; The push button signalling that keyboard circuit 8 is imported the outside is also imported the storer among the CPU3 after 8 tunnel AD converter, the parameter of temperature zero drift and temperature span drift can be inputed in the CPU3 storer by keyboard circuit 8, therefore do not need LOAD CELLS 1 is carried out again the hardware compensating of temperature zero drift and temperature span drift, save technology one, reduced cost.Thermistor temp-resistance the table of comparisons, temperature drift and the temperature span drift curve that are provided by thermistor producer also are provided in the storer among the CPU3, can obtain the exact value of the digital weighing apparatus operating ambient temperature of remote control temperature compensation of the present invention by computation of table lookup.
In the various embodiments described above, temperature-compensation circuit 6 comprises measuring resistance 61 and as the SMD thermistor 62 of temperature element, output signal after measuring resistance 61 and 62 series connection of SMD thermistor, after 8 tunnel AD converter, import in the CPU3 internal storage, compare with the thermistor temp-resistance table of comparisons that is preset in the CPU3 storer, and then obtain the scope of LOAD CELLS 1 temperature correction.When the digital weighing apparatus working temperature of remote control temperature compensation of the present invention changes from-10 ℃ to+40 ℃, the resistance of thermistor 62 then changes to 15.12K Ω from 244.88K Ω, search in the temperature-resistance table of comparisons of the numerical value that 8 tunnel AD converter are tested in the CPU3 storer, and then LOAD CELLS 1 temperature error is proofreaied and correct in predefined error range.
In the various embodiments described above, power supply 10 is by stabilized voltage supply DC-DC charge pump 11 output two-way power supplys, be the power supply of AD modular converter 2 and the power supply of CPU3, with the power supply of AD modular converter 2 and CPU3 separately, can effectively improve the antijamming capability of AD modular converter 2.Power supply of the present invention 10 adopts 5V～2.5V direct current supplys, and when power supply 10 voltages during at 5V～2.5V fluctuation, stabilized voltage supply DC-DC charge pump 11 can also play pressure stabilization function, and then does not influence testing result.
In the various embodiments described above, because the present invention adopts AD modular converter 2 and wireless communication module 9 all are arranged on the circuit board, close proximity can occur very big wireless wave like this and disturb between the two.Therefore, the present invention adopts and be provided with paster LC element and the screen layer that absorbs electromagnetic interference (EMI) around AD modular converter 2, and adopts AD sampling and wireless receiving and dispatching timesharing partition method, has avoided both interference each other.Timesharing partition method of the present invention adopts the software second-order filter, makes that AD modular converter 2 stability are very good.
In the various embodiments described above, AD modular converter 2 adopts 24 octal encapsulation conversion chip HX710, and its volume is very little, the SOP8 encapsulation, and built-in difference is amplified, and binary channels is selected, and sampling rate is selected, and programmable functions is switched.
In the various embodiments described above, CPU3 adopts the chip of the high speed 1T TSSOP-20 microencapsulated of STC Corporation, externally be provided with asynchronous communication interface and the high-speed synchronous communication interface of 115200 baud rates at a high speed, built-in FLASH and EEP, 8 tunnel 10 high-speed A/D converters, can measure power supply 10 voltages, measure temperature, survey a plurality of buttons, with realization A/D conversion, thermometric, survey key, data processing, wireless receiving and dispatching, the functions such as setting and control of weighing.
Wherein, also be provided with the button control module in the CPU3, adopt the single-signal-line can external a plurality of buttons, the AD value of each button is stored among the FLASH of CPU3 also on-site proving at any time, test, inspection easily.Each button has able to programme self-defined, (generally can not occur) when for example the button resistance value alters a great deal suddenly, can online automatic correcting key value very easily.
In the various embodiments described above, external DSP display 4 can adopt LCD, LED, VFD, MCD(dot matrix Chinese display) etc. various displays, also can adopt interim external displaying block, or directly be fixed on the LOAD CELLS 1; Wherein, LCD shows low-power consumption.Therefore, see the process of weighing by external DSP display 4 is can be at the scene online, do not need peripheral hardware CPU and software.
In sum, the temp compensation method of the digital weighing apparatus of remote control temperature compensation of the present invention, be in CPU3 to carrying out temperature zero compensation and temperature span compensation by the working temperature of LOAD CELLS 1, its compensation method is as follows:
1) AD modular converter 2 is with among the detected LOAD CELLS 1 weight signal input CPU3, carry out one section or five segment marks fixed (being sensor weight linearization process) by the AD weight signal of CPU3, the nonlinearity erron of LOAD CELLS 1 is dwindled greatly, after fixed through one section or five segment marks, its linearization mathematics is touched type (being temperature drift and temperature span drift curve) and is solidificated in the storer of CPU3.User for convenience, cost saving can adopt a segment mark fixed, and having kept original linearization mathematics, to touch type constant, also can reach good effect.
2) temperature zero compensation: the temperature drift and the temperature range curve that preset in the CPU3 storer are divided ten districts in-10 ℃～+ 40 ℃ scopes, each district is 6.4 degree, be divided into 64 compensation steps, be divided into 640 compensation blocks again in each compensation step, namely each compensation block is 0.1 degree.Code value in the zero-bit AD of the working temperature of the LOAD CELLS 1 that 8 tunnel AD converter will record by temperature-compensation circuit 6, need not calculate in the storer that is directly inputted to CPU3, earlier in temperature-resistance table of comparisons, find corresponding temperature value, then this temperature value is found and its compensation block that approaches in the corresponding compensation step on temperature drift curve, automatically the variation at compensation temperature zero point, and according to the different Changing Patterns of each working sensor temperature, all-the-way tracking no longer needs the hardware temperatures zero compensation.
3) temperature span compensation: the temperature span drift of LOAD CELLS 1 is different with temperature zero drift, it and the elastic body of LOAD CELLS 1 and the material of foil gauge have main relation, the elastic feel quantity of every batch of Weighing sensor elastomer and the elasticity coefficient of foil gauge are regular with variation of temperature, discreteness is smaller, so the range temperature compensation is regular, the zero-bit compensate for slower is easy relatively.The present invention adopts the drift value by each sensor temperature range of record, by interface circuit 5 or keyboard circuit 8 drift value that records is input in the storer of CPU3, temperature according to test calculates the span compensation value of this temperature by the built-in computation model of CPU, is revised to get final product.
In sum, temperature-compensation circuit 6 is when carrying out temperature test to LOAD CELLS 1, can record the drift reading of LOAD CELLS 1 temperature zero drift and temperature range, adopt among interface circuit 5 or the keyboard circuit 8 parameter input CPU3 with temperature zero drift and temperature span drift and store, therefore do not need LOAD CELLS 1 is carried out again the hardware compensating of temperature zero drift and temperature span drift, save technology one, reduced cost.And, because temperature-compensation circuit 6 at any time at compensation temperature zero drift and temperature span drift, has improved the qualification rate of LOAD CELLS 1 at any time in the temperature of measuring LOAD CELLS 1 greatly, solved the performance at random of LOAD CELLS 1 temperature zero drift.
The various embodiments described above only are used for explanation the present invention; the connection of each parts and structure all can change to some extent; on the basis of technical solution of the present invention; all improvement and equivalents of connection and the structure of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (10)
1. the digital weighing apparatus of a remote control temperature compensation, it is characterized in that: it comprises LOAD CELLS, AD modular converter, CPU, external DSP display, interface circuit, temperature-compensation circuit, external voltage test circuit, keyboard circuit, the wireless communication module that is made of equal arm bridge four resistance strain gages, and is power supply and the stabilized voltage supply DC-DC charge pump of each parts power supply;
After described LOAD CELLS is converted to analog electrical signal with detected force signal, imports described AD modular converter analog electrical signal is converted to digital signal, and import the gravimetric value that obtains testee after handling in the described CPU; The output terminal of described CPU connects described external DSP display and interface circuit, and the input end of described CPU connects described temperature-compensation circuit, and the output terminal of described CPU also connects described wireless communication module;
Described power supply is respectively described AD modular converter and CPU power supply by described stabilized voltage supply DC-DC charge pump output two-way power supply.
2. the digital weighing apparatus of a kind of remote control temperature compensation as claimed in claim 1, it is characterized in that: be built-in with 8 tunnel AD converter among the described CPU, wherein three the tunnel connect described temperature-compensation circuit, external voltage test circuit and keyboard circuit respectively; Described temperature-compensation circuit after described 8 tunnel AD converter, is imported detected operating ambient temperature value to carry out temperature compensation in the storer among the described CPU; Described external voltage test circuit is for detection of the supply voltage of described power supply, and after described 8 tunnel AD converter storer among the described CPU of input, detect described power supply power supply state; The push button signalling that described keyboard circuit is imported the outside is also imported the storer among the described CPU after described 8 tunnel AD converter, input in the described CPU storer by the parameter of described keyboard circuit with temperature zero drift and temperature span drift; Thermistor temp-resistance the table of comparisons, temperature drift and the temperature span drift curve that are provided by thermistor producer also are provided in the storer among the described CPU.
3. the digital weighing apparatus of a kind of remote control temperature compensation as claimed in claim 1, it is characterized in that: described temperature-compensation circuit comprises measuring resistance and as the SMD thermistor of temperature element, output signal after described measuring resistance and the series connection of SMD thermistor, in the described CPU storer of input, compare with the thermistor temp-resistance table of comparisons that is preset in the described CPU storer after 8 tunnel AD converter in described CPU.
4. the digital weighing apparatus of a kind of remote control temperature compensation as claimed in claim 2, it is characterized in that: described temperature-compensation circuit comprises measuring resistance and as the SMD thermistor of temperature element, output signal after described measuring resistance and the series connection of SMD thermistor, in the described CPU storer of input, compare with the thermistor temp-resistance table of comparisons that is preset in the described CPU storer after 8 tunnel AD converter in described CPU.
5. as claim 1 or the digital weighing apparatus of 2 or 3 or 4 described a kind of remote control temperature compensations, it is characterized in that: described power supply adopts 5V～2.5V direct current supply.
6. as claim 1 or the digital weighing apparatus of 2 or 3 or 4 described a kind of remote control temperature compensations, it is characterized in that: described AD modular converter adopts 24 octal encapsulation conversion chip HX710, and around described AD modular converter, be provided with paster LC element and the screen layer that absorbs electromagnetic interference (EMI), and adopting AD sampling and wireless receiving and dispatching timesharing partition method, described timesharing partition method adopts the software second-order filter.
7. as claim 1 or the digital weighing apparatus of 2 or 3 or 4 described a kind of remote control temperature compensations, it is characterized in that: described CPU adopts the chip of the high speed 1T TSSOP-20 microencapsulated of STC Corporation; Described external DSP display adopts LCD, LED, VFD or MCD display.
8. the digital weighing apparatus of a kind of remote control temperature compensation as claimed in claim 5, it is characterized in that: described CPU adopts the chip of the high speed 1T TSSOP-20 microencapsulated of STC Corporation; Described external DSP display adopts LCD, LED, VFD or MCD display.
9. the digital weighing apparatus of a kind of remote control temperature compensation as claimed in claim 6, it is characterized in that: described CPU adopts the chip of the high speed 1T TSSOP-20 microencapsulated of STC Corporation; Described external DSP display adopts LCD, LED, VFD or MCD display.
10. as the temp compensation method of any digital weighing apparatus of described a kind of remote control temperature compensation of claim 1～9, its compensation method is as follows:
(1) described AD modular converter is imported detected described LOAD CELLS weight signal among the described CPU, carry out one section or the fixed linearization process of five segment marks by the AD weight signal of described CPU, after fixed through one section or five segment marks, the temperature drift of LOAD CELLS and temperature span drift curve are solidificated in the storer of described CPU;
(2) temperature zero compensation: the temperature drift and the temperature range curve that preset in the described CPU storer are divided ten districts in-10 ℃～+ 40 ℃ scopes, each district is 6.4 degree, be divided into 64 compensation steps, be divided into 640 compensation blocks again in each compensation step; Code value in the zero-bit AD of the working temperature of the LOAD CELLS that described 8 tunnel AD converter will record by described temperature-compensation circuit, be directly inputted in the storer of described CPU, at first in temperature-resistance table of comparisons, find corresponding temperature value, then with the compensation block that this temperature value finds in the corresponding compensation step on temperature drift curve and it approaches, the variation at compensation temperature zero point automatically;
(3) temperature span compensation: the material of the temperature span drift of described LOAD CELLS and the elastic body of LOAD CELLS and foil gauge has main relation, by recording the drift value of each sensor temperature range in the described LOAD CELLS, and be input in the storer of described CPU by described interface circuit or the keyboard circuit drift value with record, temperature according to test, calculate the span compensation value of this temperature by the built-in computation model of CPU, revised and get final product.
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| CN110044508A (en) * | 2018-01-15 | 2019-07-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its temp measuring method, device |
| CN110044508B (en) * | 2018-01-15 | 2021-02-26 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and temperature measuring method and device thereof |
| CN108716957A (en) * | 2018-06-21 | 2018-10-30 | 迈格仪表(成都)有限公司 | A kind of characterization buckling diaphragm capsule |
| CN113739881A (en) * | 2021-11-08 | 2021-12-03 | 深圳市杰曼科技股份有限公司 | Temperature drift resistant weighing sensor signal measuring circuit |
| CN113739881B (en) * | 2021-11-08 | 2022-01-25 | 深圳市杰曼科技股份有限公司 | Temperature drift resistant weighing sensor signal measuring circuit |
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Application publication date: 20130807 |