CN101907480B - Weighting sensor preamplifier circuit - Google Patents
Weighting sensor preamplifier circuit Download PDFInfo
- Publication number
- CN101907480B CN101907480B CN201010251075A CN201010251075A CN101907480B CN 101907480 B CN101907480 B CN 101907480B CN 201010251075 A CN201010251075 A CN 201010251075A CN 201010251075 A CN201010251075 A CN 201010251075A CN 101907480 B CN101907480 B CN 101907480B
- Authority
- CN
- China
- Prior art keywords
- circuit
- instrument amplifier
- usb
- circuit board
- power
- 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.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The invention relates to a weighting sensor preamplifier circuit, in particular to a sensor preamplifier circuit with adjustable output voltage in the range of 0 to 5V. The weighting sensor preamplifier circuit is a circuit board. The circuit board is provided with a USB interface circuit, a 5V power conversion circuit, an instrument amplifier amplifying circuit, a sensor input interface circuit and a circuit board output interface circuit. The invention has the advantages of simple structure, reliable performance, adjustable voltage output range and good measuring accuracy, and is suitable for daily life and industrial process control.
Description
Technical field
The present invention relates to a kind of Weighting sensor preamplifier circuit, particularly relate to the sensor preamplifier circuit of a kind of 0-3.3V of having output or the output of 0-5V voltage.
Background technology
Resistance-strain chip LOAD CELLS can be simplified to resistance bridge; When sensor bears certain load, symmetrical deflection will take place in the resistance of resistance, after giving sensor energize; Signal of sensor will be proportional with added load; Gravimetric value is become measurable simulating signal, and simulating signal is sent the data of weighing after pre-amplification circuit, A/D conversion and CPU handle.Because electrical network imports into; Earth potentials etc. form common mode interference signal; And by external electromagnetic field inductive coupling and by the formed voltage of unbalanced circuit conversion common mode interference between signal; The signal of common mode interference signal and DM EMI all can be sealed in through input signal and output signal, and directly influence is measured and control accuracy.
The treatable A/D sampled voltage of some cpu chip is 0-5V, such as, single-chip microcomputer etc., also the treatable A/D sampled voltage of some cpu chip is 0-3.3V, like DSP, FPGA etc.The Weighting sensor preamplifier circuit output voltage of standard is generally 0-5V on the market, when chips such as cpu chip use DSP or FPGA, just need the 0-5V signal of standard be transformed into again off-gauge 0-3.3V, causes complicated circuit.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of circuit structure, and common mode and DM EMI signal suppressing ability are strong, make things convenient for power taking, has the adjustable Weighting sensor preamplifier circuit of output voltage range.
Technical scheme of the present invention is: a kind of Weighting sensor preamplifier circuit relates to a kind of output voltage adjustable sensor preamplifier circuit in the 0-5V scope that has.This Weighting sensor preamplifier circuit is a circuit board, and circuit board is provided with usb circuit ,-5V power-switching circuit, instrument amplifier amplifying circuit, sensor input interface circuit and circuit board output interface circuit.
Wherein, usb circuit is used for from the computer USB interface power taking;-5V power-switching circuit is made up of ICL7660 chip and two electric capacity, and the ICL7660 chip contains eight pins, and capacitances in series is between the pin pipe of ICL7660 chip, and the ICL7660 chip can be with positive 5V voltage transformation one-tenth-5V voltage; The instrument amplifier amplifying circuit is made up of AD623 instrument amplifier, adjustable resistance and four electric capacity.The AD623 instrument amplifier contains eight pins; Be connected in series adjustable resistance and four electric capacity between its pin respectively; The AD623 instrument amplifier can amplify the positive negative energize differential signal of LOAD CELLS; Electric capacity can carry out effective filtering to AD623 instrument amplifier power pin, and adjustable resistance can regulation meter amplifier gain amplifier.The sensor input interface circuit can be from the sensor number of winning the confidence, and the circuit board output interface circuit can be drawn output voltage and reference voltage.
AD623 instrument amplifier in the instrument amplifier amplifying circuit respectively with usb circuit ,-5V power-switching circuit, sensor input interface circuit be connected with the circuit board output interface circuit; In usb circuit and the-5V power-switching circuit, the ICL7660 chip is connected.
Description of drawings
Fig. 1 is wiring board general frame figure;
Fig. 2 is a usb circuit;
Fig. 3 is-the 5V power-switching circuit;
Fig. 4 is the instrument amplifier amplifying circuit;
Fig. 5 is the sensor input interface circuit;
Fig. 6 is the circuit board output interface.
Embodiment
See shown in Figure 1ly, this Weighting sensor preamplifier circuit is a circuit board.Circuit board is provided with usb circuit ,-5V power-switching circuit, instrument amplifier amplifying circuit, sensor input interface circuit and circuit board output interface circuit.
Like Fig. 2,3,4, shown in 5, in the circuit board, the 1st, 4 pins of usb circuit connect 5V power supply and ground wire respectively, for the entire circuit plate provides 5V power supply and ground wire; Usb circuit links to each other with the ICL7660 chip, for the ICL7660 chip provides power supply and ground; Capacitor C 1 and C2 are connected on respectively between 2,4 pins and 5,3 pins of ICL7660 chip, in the chip transfer process, play a part to discharge and recharge, simultaneously the 5th pin output-5V voltage of ICL7660 chip; Usb circuit and ICL7660 chip are respectively the AD623 instrument amplifier 5V and-5V power supply are provided; Serial connection adjustable resistance R1 between the 1st, 8 pins of AD623 instrument amplifier; Resistance through regulating R1 just can regulation meter amplifier AD623 instrument amplifier gain amplifier, differential output voltage can be according to formula
Convert, wherein, V
OBe the voltage between the 5th, 6 pins of AD623 instrument amplifier, represent the voltage after differential signal amplifies, V
CBe the voltage between sensor positive signal end and the negative signal end, the differential signal voltage of representative sensor output; Capacitor C 3, C4 are connected in parallel between the 4th pin and ground of AD623 instrument amplifier; For get into the 4th pin-the 5V power supply carries out filtering; Capacitor C 5, C6 are connected in parallel between AD623 instrument amplifier the 7th pin and the ground wire, for the 5V power supply that gets into the 7th pin carries out filtering; The circuit board output interface extracts the output voltage and the reference voltage of AD623 instrument amplifier, be convenient to the AD sampling module between interface be connected.
During practical implementation; Power lead, positive signal end, ground wire and the negative signal end of sensor output terminal are received respectively on the 1st, 2,3,4 pins of the sensor input interface circuit on the circuit board; Computer USB interface on the usb circuit termination is carried out power taking; When regulating output voltage; It is the needed output voltage of scalable that contrast
formula is regulated R1, and with the output voltage of circuit board output interface with reference voltage is delivered to the A/D change-over circuit and CPU handles.
Claims (1)
1. Weighting sensor preamplifier circuit; Its one-piece construction is a circuit board, and circuit board is provided with usb circuit ,-5V power-switching circuit; The instrument amplifier amplifying circuit; Sensor input interface circuit and circuit board output interface circuit is characterized in that :-5V power-switching circuit is made up of ICL7660 chip and two capacitor C 1, C2, and capacitor C 1 and C2 are connected on respectively between 2,4 pins and 5,3 pins of ICL7660 chip; The instrument amplifier amplifying circuit is made up of AD623 instrument amplifier, adjustable resistance R1 and four capacitor C 3, C4, C5 and C6; Said AD623 instrument amplifier contains eight pins, and capacitor C 3, C4 are connected in parallel between the 4th pin and ground of AD623 instrument amplifier, and capacitor C 5, C6 are connected in parallel between AD623 instrument amplifier the 7th pin and the ground wire; Serial connection adjustable resistance R1 between the 1st, 8 pins of AD623 instrument amplifier; AD623 instrument amplifier in the instrument amplifier amplifying circuit respectively with usb circuit ,-5V power-switching circuit, sensor input interface circuit be connected with the circuit board output interface circuit, usb circuit is connected with ICL7660 chip in the-5V power-switching circuit, wherein; Usb circuit is used for from the computer USB interface power taking; And for the entire circuit plate provides 5V power supply and ground wire, usb circuit and ICL7660 chip are respectively the AD623 instrument amplifier 5V and-5V power supply are provided, and the circuit board output interface is drawn the output voltage and the reference voltage of AD623 instrument amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010251075A CN101907480B (en) | 2010-08-11 | 2010-08-11 | Weighting sensor preamplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010251075A CN101907480B (en) | 2010-08-11 | 2010-08-11 | Weighting sensor preamplifier circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101907480A CN101907480A (en) | 2010-12-08 |
| CN101907480B true CN101907480B (en) | 2012-10-10 |
Family
ID=43263004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010251075A Active CN101907480B (en) | 2010-08-11 | 2010-08-11 | Weighting sensor preamplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101907480B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157745A (en) * | 2015-05-07 | 2015-12-16 | 黑龙江省科学院自动化研究所 | Multi-sensor signal acquisition and processing device and information acquisition method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1310889A (en) * | 1969-12-04 | 1973-03-21 | Rich P W | Electrical measuring device |
| JPS59228120A (en) * | 1983-06-09 | 1984-12-21 | Tokyo Electric Co Ltd | Load cell scale |
| CN2333005Y (en) * | 1998-05-26 | 1999-08-11 | 张兆义 | High performance/price ratio, portable electronic valuation balance |
| CN2697639Y (en) * | 2004-03-31 | 2005-05-04 | 上海神明控制工程有限公司 | Small size intelligent integrated flame tester |
| CN1821725A (en) * | 2005-01-14 | 2006-08-23 | 中国科学院上海微系统与信息技术研究所 | Real-time online measuring system for over load of high speed vehicle |
| CN101238973A (en) * | 2007-02-06 | 2008-08-13 | 深圳职业技术学院 | Multi-parameter transmission apparatus for telemonitoring |
| GB2450360C (en) * | 2007-06-21 | 2020-01-29 | Niftylift Ltd | Load monitoring system |
| CN201740575U (en) * | 2010-08-11 | 2011-02-09 | 富美科技有限公司 | Weighing sensor preamplification circuit |
-
2010
- 2010-08-11 CN CN201010251075A patent/CN101907480B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 彭早生.运矿索道动态称重若干问题研究.《中国优秀博硕士论文全文数据库（硕士） 工程科技I辑》.2006,(第5期),27-30. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101907480A (en) | 2010-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102901549B (en) | Driving, signal conditioning and acquisition device for strain resistance type pressure sensor | |
| CN203705533U (en) | Current detection circuit of Hall current sensor of electric automobile | |
| CN202793312U (en) | Digital double-shaft angular displacement sensor | |
| CN102032900A (en) | Digital dip-angle sensor | |
| CN101476903A (en) | General-purpose interface collection system of sensor | |
| CN102645293A (en) | Intelligent pressure transmitter | |
| CN102798454A (en) | Miniature electronic balance | |
| CN202372173U (en) | Portable tilt sensor based on micro-electro-mechanical system (MEMS) accelerometer | |
| CN204556077U (en) | A kind of low-power consumption body weigher based on radio communication | |
| CN101907480B (en) | Weighting sensor preamplifier circuit | |
| CN202522348U (en) | Intelligent pressure transmitter | |
| CN201909809U (en) | Measuring instrument for 25-Hz phase-sensitive track circuit | |
| CN201740575U (en) | Weighing sensor preamplification circuit | |
| CN201897473U (en) | Digital inclination sensor | |
| CN207557152U (en) | A kind of novel pH value intelligent measure circuit | |
| CN203785751U (en) | Weighing circuit and electronic scale possessing same | |
| CN1246678C (en) | Digital vibration and impact sensor | |
| CN203812008U (en) | Analog signal collector | |
| CN200989917Y (en) | Voltage sensor | |
| CN202815012U (en) | Digital three-axis micro-acceleration sensor | |
| CN205352461U (en) | Dark monitoring devices of sea water temperature | |
| CN206365585U (en) | A kind of luggage hand handle with function of weighing | |
| CN104713579A (en) | Universal type sensor signal processing system | |
| CN204214462U (en) | A kind of universal sensor signal processing system | |
| CN201247271Y (en) | Electronic single-phase power electric energy meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: FOREVER TECHNOLOGY GROUP CO., LTD. Free format text: FORMER NAME: FOREVER SCIENCE AND TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 250306 Shandong city of Ji'nan province Ji'nan Economic Development Zone (Changqing Peace Road) forrich Formica Technology Group Limited Patentee after: Forever Technology Group Co.,Ltd. Address before: 250306 Fu Jing Road, Ji'nan Economic Development Zone, Ji'nan, Shandong, Changqing Patentee before: Forever Technology Co.,Ltd. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Weighting sensor preamplifier circuit Effective date of registration: 20140123 Granted publication date: 20121010 Pledgee: China Shipping XinDa, Company limited by guarantee Pledgor: Forever Technology Group Co.,Ltd. Registration number: 2014990000043 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20140702 Granted publication date: 20121010 Pledgee: China Shipping XinDa, Company limited by guarantee Pledgor: Forever Technology Group Co.,Ltd. Registration number: 2014990000043 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20151124 Granted publication date: 20121010 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20160524 Granted publication date: 20121010 |
|
| PP01 | Preservation of patent right |
Effective date of registration: 20160524 Granted publication date: 20121010 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Lili Document name: Notice of preservation proceeding |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Lili Document name: Notice of commencement of preservation procedure |