CN203785751U - Weighing circuit and electronic scale possessing same - Google Patents
Weighing circuit and electronic scale possessing same Download PDFInfo
- Publication number
- CN203785751U CN203785751U CN201420039462.XU CN201420039462U CN203785751U CN 203785751 U CN203785751 U CN 203785751U CN 201420039462 U CN201420039462 U CN 201420039462U CN 203785751 U CN203785751 U CN 203785751U
- Authority
- CN
- China
- Prior art keywords
- chip
- weighing
- conversion
- amplification
- circuit
- 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
- 238000005303 weighing Methods 0.000 title claims abstract description 67
- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
- 230000003321 amplification Effects 0.000 claims abstract description 37
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 37
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000011021 bench scale process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011900 installation process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 241001465977 Coccoidea Species 0.000 description 1
- 206010040844 Skin exfoliation Diseases 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Measurement Of Force In General (AREA)
Abstract
The utility model provides a weighing circuit and an electronic scale possessing the same. A weighing sensor and an amplification and conversion device are integrated in the weighing circuit, wherein the output end of the weighing sensor is connected with the input end of the amplification and conversion device, and the amplification and conversion device is used to amplify an analog signal outputted from the output end of the weighing sensor, and convert the analog signal into a digital signal. The weighing sensor and the amplification and conversion device are integrated in the weighing circuit provided by the utility model, wherein the amplification and conversion device can amplify the analog signal outputted from the output end of the weighing sensor, and convert the analog signal into a digital signal, so that the anti-interference performance of the digital signal is better than that of the analog signal. Compared with the weighing circuit outputting the analog signal in the prior art, the anti-interference performance of the weighing circuit provided by the utility model is improved obviously, thereby improving the accuracy of a weighing result.
Description
Technical field
The utility model belongs to weighing technology field, is specifically related to a kind of weighing circuit and possesses the electronic scales of this circuit.
Background technology
Electronic scales, is the automation equipment for goods is weighed, and by the power electricity conversion of LOAD CELLS, through weighing instrument, has processed the metering to goods.The weighing circuit that a lot of existing electronic scaless (for example electronic portable platform and bench scale) adopt at present consists of LOAD CELLS, wherein the output signal of LOAD CELLS is simulating signal (signal amplitude is mV level), and must convert digital signal to through the processing of a series of discrete devices could be connected to show weighing results with the display device such as POS or secondary instrument.
In general the interference free performance of simulating signal is poor, and therefore in use, the interference free performance of the weighing circuit integral body of the electronic scales of this structure is very poor, weighing results is not accurate enough.
Summary of the invention
For solving the defect of the LOAD CELLS circuit anti-interference poor performance that existing electronic scales uses, a kind of weighing circuit is proposed, specific as follows:
A weighing circuit, this weighing circuit is integrated with LOAD CELLS, amplification and conversion equipment, wherein,
The output terminal of this LOAD CELLS is connected to the input end of described amplification and conversion equipment, and described amplification and conversion equipment are used for the simulating signal of the output terminal output from described LOAD CELLS being amplified and converting thereof into digital signal.
Further, described amplification and conversion equipment comprise: amplifier and AD converter; Described amplifier, for amplifying described simulating signal; Described AD converter is used for, and converts the described simulating signal after amplifying to digital signal.
Further, described amplification and conversion equipment comprise wave filter, and described amplification and conversion equipment are also for carrying out the described simulating signal after amplifying filtering and convert the described simulating signal after filtering to digital signal.
Further, described amplification and conversion equipment adopt conversion chip, and described conversion chip is ADS1231 type conversion chip.
Further, described LOAD CELLS is resistance strain type sensor, capacitance type sensor or electro-optical pickoff.
Further, described amplification and conversion equipment adopt conversion chip, and described conversion chip is ADS1231 type conversion chip; Described resistance strain type sensor comprises flexible member, is bonded in resistance strain gage and testing circuit on flexible member, and described testing circuit input end connects described flexible member, and output terminal connects the differential input end of conversion chip.
Further, also comprise a power circuit, this power circuit comprises low pressure difference linearity voltage stabilizing chip, accurate voltage chip and accurate voltage stabilizing chip, described low pressure difference linearity voltage stabilizing chip output+5V voltage to the analog electrical pressure side of described conversion chip, the voltage input end of the input end of accurate voltage chip and described accurate voltage stabilizing chip, the output terminal of this precision voltage stabilizing chip is connected to the reference power source end of conversion chip, and the output terminal of described accurate voltage chip is connected to the digital voltage end of conversion chip.
Further, described testing circuit is Hui Sideng circuit.
The utility model also proposes a kind of electronic scales in addition, and this electronic scales is provided with weighing circuit described above.
Compared with prior art, advantage of the present invention and good effect are as follows:
The weighing circuit that the utility model provides, is integrated with LOAD CELLS and amplification and conversion equipment, and amplification wherein and conversion equipment can amplify the simulating signal of exporting from LOAD CELLS and convert thereof into digital signal.The interference free performance of digital signal is better than the interference free performance of simulating signal, and with respect to the weighing circuit of outputting analog signal in prior art, the interference free performance of the weighing circuit that the utility model provides obviously improves, and then has improved the accuracy of weighing results.
In addition, the utility model also adopts the conversion chip of integrated signal amplifier, filtering circuit and analog to digital conversion circuit, greatly strengthened whole anti-interference, and be installed to electronic scales as electronic portable platform and bench scale on time, only the output terminal of this weighing circuit need be connected with electronic portable platform and bench scale miscellaneous part, make installation process convenient, in addition, during debugging, this weighing circuit is done to as a whole debugging, make debug process also convenient.
Read by reference to the accompanying drawings after embodiment of the present utility model, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the utility model embodiment weighing circuit theory diagram;
Fig. 2 is the utility model embodiment weighing circuit schematic diagram;
Fig. 3 is the utility model embodiment power circuit principle figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment mono-,
The present embodiment proposes a kind of weighing circuit, with reference to figure 1, this weighing circuit is integrated with LOAD CELLS, amplification and conversion equipment, wherein, the output terminal of this LOAD CELLS is connected to the input end of described amplification and conversion equipment, and described amplification and conversion equipment are used for the simulating signal of the output terminal output from described LOAD CELLS being amplified and converting thereof into digital signal.
The utility model provides a kind of weighing circuit, and this weighing circuit is integrated with LOAD CELLS and amplification and conversion equipment, and amplification wherein and conversion equipment can amplify the simulating signal of exporting from LOAD CELLS and convert thereof into digital signal.The interference free performance of digital signal is better than the interference free performance of simulating signal, and with respect to the weighing circuit of outputting analog signal in prior art, the interference free performance of the weighing circuit that the utility model provides obviously improves, and then has improved the accuracy of weighing results.
The signal of above-mentioned weighing circuit output is without the processing through a series of discrete devices such as amplifier, wave filter and AD converter.
In addition, weighing circuit in the utility model embodiment integrates LOAD CELLS and amplification and conversion equipment, in use procedure, only the output terminal of this weighing circuit for example, need be connected with electronic scales (electronic portable platform and bench scale) miscellaneous part, make installation process convenient, in addition, during debugging, this weighing circuit is done to as a whole debugging, make debug process also convenient.
It should be noted that, the LOAD CELLS in the utility model embodiment can adopt polytype LOAD CELLS, and amplification and conversion equipment can have multiple different structure:
In an embodiment, amplification and conversion equipment can comprise: amplifier and analog to digital converter (being AD converter); Described amplifier is for amplifying described simulating signal; Described AD converter is for converting the described simulating signal after amplifying to digital signal.
In another embodiment, amplification and conversion equipment can comprise amplifier, wave filter and AD converter, wave filter is wherein for the simulating signal after amplifier amplifies is carried out to filtering, and this AD converter is used for the filtered simulating signal of device after filtering and converts digital signal to.
In another embodiment, amplification and conversion equipment can be conversion chip (for example ADS1231 type conversion chip), this conversion chip integrates amplifier, wave filter and AD converter, the function of amplifier, wave filter and AD converter that this conversion chip is integrated, can realize amplification, the filtering to simulating signal and be converted into digital signal.
For describing the technical scheme of the utility model embodiment in detail, the ADS1231 pattern number converter of take is below introduced as concrete example.It should be noted that, following example is only a concrete scheme of the present utility model, and the utility model embodiment can also comprise other schemes, at this, does not enumerate.
With reference to figure 2, B in schematic diagram is resistance strain weighing transducer, 1,3 pin of this sensor connect driving voltage, and 2,4 pin convert electric signal to using the variation of resistance and are connected to input end AINP, the AINN of the differential signal of ADS1231 type conversion chip U1 as output.While weighing, sensor converts the weight signal of object to linear with it simulating signal, is input in conversion chip U1, and signal is through amplifying, converting digital signal to, then is transferred in MCU and processes.
Data preparation/the data of conversion chip U1 are exported multiplexing pin DRDY/DOUT and are had dual-use function, the interruption pin INT0 of external MCU reads the state (being connected by serial port of mainboard XS1 between conversion chip U1 and MCU) of this pin, when becoming when low, this pin represents that data are ready to, MCU carries out interrupt routine, 15 first rising edges of pin SCLK at conversion chip U1 come then, the 16 pin DRDY/DOUT of U1 become data output, and MCU can read the output signal of ADC16 pin.4 pin of U1,14 pin are connected on the IO of MCU, by program, data rate, power-down mode can be set.AVDD is analog voltage pin, DVDD is digital voltage pin, in order to improve the precision of conversion chip U1 conversion, the voltage of the present embodiment analog voltage pin and digital voltage pin is provided by different voltage, and 10 pin reference voltage end VREFP provide by standard of precision voltage.
Particularly, with reference to figure 3, the present embodiment proposes a kind of power circuit, this power circuit comprises that model is the low pressure difference linearity voltage stabilizing chip U7 of AS117-5V, model is the accurate voltage chip U8 of AS117-3.3V and the accurate voltage stabilizing chip U6 that model is REF5050, wherein said low pressure difference linearity voltage stabilizing chip U7 output terminal OUT output+5V voltage, this output terminal is connected to the analog electrical pressure side AVDD of conversion chip on the one hand, be connected on the other hand the input end IN of accurate voltage chip U8, be connected on the one hand the voltage input end Vin of more described accurate voltage stabilizing chip U6, the output end vo ut of this precision voltage stabilizing chip is connected to the reference power source end VREFP of conversion chip U1, the output terminal OUT of described accurate voltage chip U8 is connected to the digital voltage end DVDD of conversion chip U1.This circuit construction of electric power is simple, and cost is lower, and reliability is higher.In addition, each chip in this power circuit can also adopt other models, and concrete model illustrated in fig. 3 is only an example.
The present embodiment LOAD CELLS adopts resistance strain type sensor, certainly other can realize the sensor of weighing also can to adopt electro-optical pickoff, capacitance type sensor etc., the present embodiment resistance strain type sensor be based on tinsel when tension or the pressurized generation elastic deformation, its resistance value also produces this physical characteristics of respective change and makes, mainly by three parts, formed: flexible member, resistance strain gage and testing circuit, by technology for applying, three is coupled together, just can realize the linear transformation between weight-electric signal.When the tinsel of resistance strain gage bears External Force Acting generation elastic deformation, can there is corresponding variation in its length, sectional area and resistivity, now the resistance of foil gauge will change, testing circuit is transformed into corresponding Voltage-output by the change in resistance of resistance strain gage, thereby by subsequent conditioning circuit, record added weight, the present embodiment testing circuit adopts Hui Sideng circuit.
The present embodiment conversion chip is high-precision 24 analog to digital converter ADS1231, integrate amplifier, analog switch, A/D converter, comparer, digital filter, output interface, adopt △-∑ technology to make, only need several peripheral components just to form a complete A/D converting system.Because its integrated level is high, so probability of malfunction adopts discrete component A/D converting system obviously to reduce, and then improved system reliability.In addition, its built-in high-performance instrument amplifier, reduces the requirement to signal source greatly.Electronic scales resistance strain weighing transducer output signal is mV level, if just can carry out A/D conversion after adopting general A/D converter often to need to amplify, and △-∑ A/D converter has mostly adopted programmable-gain amplifier, the multinomial advanced technologies such as programmable digital filtering, multiple self calibration technology, and most microprocessors that adopt are managed and control converse routine, owing to having adopted multiple comprehensive technical measure, gain adjustment, digital filtering and the error correction of amplifier all concentrate in same chip, peripheral components is few, easy to use and reliable.
The present embodiment weighing circuit can be widely used in towards miniaturization, and high precision, in the electronic scales product of intelligent direction development.
Embodiment bis-,
The present embodiment also provides a kind of electronic scales, and this electronic scales has weighing circuit described in embodiment mono-, and wherein this weighing circuit can adopt the weighing circuit of the arbitrary structures described in embodiment mono-.
Weighing circuit in embodiment mono-can be applied to multiple different electronic scales, (for example the range of electronic scales is in 200KG for the electronic scales that for example electronic scales of electronic portable platform and bench scale or other types or range are less, such as below 100KG or below 50KG) etc., can determine according to concrete application demand, the utility model does not limit this.
Weighing circuit in above-mentioned electronic scales is integrated with LOAD CELLS and amplification and conversion equipment, and amplification wherein and conversion equipment can amplify the simulating signal of exporting from LOAD CELLS and convert thereof into digital signal.The interference free performance of digital signal is better than the interference free performance of simulating signal, so the interference free performance of the weighing circuit in this electronic scales obviously improves, and then has improved the accuracy of weighing results.
In addition, weighing circuit in above-mentioned electronic scales integrates LOAD CELLS and amplification and conversion equipment, in use procedure, only the output terminal of this weighing circuit for example, need be connected with electronic scales (electronic portable platform and bench scale) miscellaneous part, make the installation process of electronic scales convenient, in addition, during debugging, this weighing circuit is done to as a whole debugging, make the debug process of whole electronic scales also convenient.
The above, be only preferred embodiment of the present utility model, is not to restriction of the present utility model, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But, every technical solutions of the utility model content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present utility model, still belong to the protection domain of technical solutions of the utility model.
Claims (8)
1. a weighing circuit, is characterized in that described weighing circuit is integrated with LOAD CELLS, amplification and conversion equipment, wherein,
The output terminal of this LOAD CELLS is connected to the input end of described amplification and conversion equipment, described amplification and conversion equipment are used for the simulating signal of the output terminal output from described LOAD CELLS being amplified and converting thereof into digital signal, described amplification and conversion equipment comprise wave filter, and described amplification and conversion equipment are also for carrying out the described simulating signal after amplifying filtering and convert the described simulating signal after filtering to digital signal.
2. weighing circuit according to claim 1, is characterized in that, described amplification and conversion equipment comprise: amplifier and AD converter;
Described amplifier, for amplifying described simulating signal;
Described AD converter is used for, and converts the described simulating signal after amplifying to digital signal.
3. weighing circuit according to claim 1, is characterized in that: described amplification and conversion equipment adopt conversion chip, and described conversion chip is ADS1231 type conversion chip.
4. weighing circuit according to claim 1, is characterized in that, described LOAD CELLS is resistance strain type sensor, capacitance type sensor or electro-optical pickoff.
5. weighing circuit according to claim 4, is characterized in that: described amplification and conversion equipment adopt conversion chip, and described conversion chip is ADS1231 type conversion chip; Described resistance strain type sensor comprises flexible member, is bonded in resistance strain gage and testing circuit on flexible member, and described testing circuit input end connects described flexible member, and output terminal connects the differential input end of conversion chip.
6. weighing circuit according to claim 1, it is characterized in that: also comprise a power circuit, this power circuit comprises low pressure difference linearity voltage stabilizing chip, accurate voltage chip and accurate voltage stabilizing chip, described low pressure difference linearity voltage stabilizing chip output+5V voltage is to the analog electrical pressure side of described conversion chip, the voltage input end of the input end of accurate voltage chip and described accurate voltage stabilizing chip, the output terminal of this precision voltage stabilizing chip is connected to the reference power source end of conversion chip, the output terminal of described accurate voltage chip is connected to the digital voltage end of conversion chip, described accurate voltage chip is AS117-3.3V type voltage chip, described accurate voltage stabilizing chip is REF5050 type voltage stabilizing chip.
7. weighing circuit according to claim 5, is characterized in that: described testing circuit is Hui Sideng circuit.
8. an electronic scales, is characterized in that: this electronic scales possesses the weighing circuit described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039462.XU CN203785751U (en) | 2014-01-22 | 2014-01-22 | Weighing circuit and electronic scale possessing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039462.XU CN203785751U (en) | 2014-01-22 | 2014-01-22 | Weighing circuit and electronic scale possessing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203785751U true CN203785751U (en) | 2014-08-20 |
Family
ID=51321929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420039462.XU Expired - Lifetime CN203785751U (en) | 2014-01-22 | 2014-01-22 | Weighing circuit and electronic scale possessing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203785751U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509851A (en) * | 2015-12-07 | 2016-04-20 | 李文艺 | Measurement accuracy self-adjusting type electronic scale |
| CN107966202A (en) * | 2017-12-14 | 2018-04-27 | 来学宝 | Electronic scale weighing module and its implementation |
| CN108489579A (en) * | 2018-04-09 | 2018-09-04 | 济南大学 | One plant feed bin electronic scale |
| CN110371431A (en) * | 2019-07-05 | 2019-10-25 | 山东晶峰玻璃科技有限公司 | A kind of anti-fake white wine bottle of whole process based on Internet of Things and its system |
-
2014
- 2014-01-22 CN CN201420039462.XU patent/CN203785751U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509851A (en) * | 2015-12-07 | 2016-04-20 | 李文艺 | Measurement accuracy self-adjusting type electronic scale |
| CN105509851B (en) * | 2015-12-07 | 2018-05-22 | 李文艺 | A kind of self-adjusting measurement accuracy electronic scale |
| CN107966202A (en) * | 2017-12-14 | 2018-04-27 | 来学宝 | Electronic scale weighing module and its implementation |
| CN108489579A (en) * | 2018-04-09 | 2018-09-04 | 济南大学 | One plant feed bin electronic scale |
| CN110371431A (en) * | 2019-07-05 | 2019-10-25 | 山东晶峰玻璃科技有限公司 | A kind of anti-fake white wine bottle of whole process based on Internet of Things and its system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203785751U (en) | Weighing circuit and electronic scale possessing same | |
| CN101776707A (en) | Current detection device | |
| CN202511939U (en) | Signal conditioning circuit of 0-5V output pressure sensor | |
| CN204705423U (en) | A kind of flapping-wing aircraft lift test macro | |
| CN105588622A (en) | High-precision weighing system | |
| CN102769436A (en) | Inexpensive micro-power-consumption miniaturized signal conditioning module applicable to portable apparatuses | |
| CN101344421B (en) | Dynamic railway truck scale data acquisition instrument and method | |
| CN203719620U (en) | Portable low-power static state resistance strain gauge | |
| CN103852002A (en) | Portable low-power-consumption static resistance strain indicator | |
| CN203551059U (en) | Analog sensor with digital compensation function | |
| CN203133019U (en) | Interference compensation device of electrochemical gas sensor | |
| CN203053529U (en) | Weighting device | |
| CN202562673U (en) | Strain acquisition system based on voltage compensation | |
| CN102035546A (en) | Voltage current transformer | |
| CN103575434A (en) | Pressure detection circuit | |
| CN203163840U (en) | High precision column type weighing sensor | |
| CN203037609U (en) | Humidity transmitter | |
| CN204313869U (en) | A kind of Collection device | |
| CN106289464A (en) | A kind of two-wire system faint strain bridge signal transmitting device | |
| CN202957809U (en) | Signal conditioning circuit improving AD (Analog to Digital) resolution | |
| CN206353049U (en) | A kind of intelligent electronic-scale system | |
| CN102095756B (en) | Humidity sensing circuit with temperature compensation function | |
| CN101509965B (en) | Zero electric voltage detecting and compensating apparatus for programmable power supply of simulation test system | |
| CN202693752U (en) | Power supply IC high precision voltage test circuit | |
| CN205246822U (en) | Gain measuring circuit is put to fortune |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 3 building, No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HISENSE INTELLIGENT COMMERCIAL SYSTEM CO.,LTD. Address before: 3 building, No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao, China Patentee before: HISENSE INTELLIGENT COMMERCIAL SYSTEM Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP03 | Change of name, title or address |
Address after: 266104 Qingdao wisdom Valley, No. 8, Shengshui Road, Laoshan District, Qingdao, Shandong Patentee after: Qingdao Haishi Commercial Technology Co.,Ltd. Address before: 266100, building 151, No. 3, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: QINGDAO HISENSE INTELLIGENT COMMERCIAL SYSTEM CO.,LTD. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |
|
| CX01 | Expiry of patent term |