CN201740575U - Weighing sensor preamplification circuit - Google Patents
Weighing sensor preamplification circuit Download PDFInfo
- Publication number
- CN201740575U CN201740575U CN2010202888096U CN201020288809U CN201740575U CN 201740575 U CN201740575 U CN 201740575U CN 2010202888096 U CN2010202888096 U CN 2010202888096U CN 201020288809 U CN201020288809 U CN 201020288809U CN 201740575 U CN201740575 U CN 201740575U
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- instrument amplifier
- sensor
- circuit board
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Abstract
The utility model relates to a weighing sensor preamplification circuit, in particular to a sensor preamplification circuit with an adjustable output voltage range of 0V-5V. The weighing sensor preamplification circuit adopts a circuit board, wherein a USB interface circuit, a minus 5V power conversion circuit, an instrument amplifier amplification circuit, a sensor input interface circuit and a circuit board output interface circuit are arranged on the circuit board. The utility model has the advantages of simple structure, reliable performance, adjustable output voltage range and higher measuring precision, and is suitable for daily life and industrial process control.
Description
Technical field
The utility model relates to a kind of Weighting sensor preamplifier circuit, particularly relates 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 differential mode interference all can be sealed in by 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, as 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 the 0-5V signal of standard need be transformed into again off-gauge 0-3.3V, causes the circuit complexity.
Summary of the invention
It is simple that the purpose of this utility model provides a kind of circuit structure, and common mode and differential mode interference signal suppressing ability are strong, make things convenient for power taking, has the adjustable Weighting sensor preamplifier circuit of output voltage range.
The technical solution of the utility model 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 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.
Shown in Fig. 2,3,4,5, 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, play a part to discharge and recharge, simultaneously the 5th pin output-5V voltage of ICL7660 chip in the chip transfer process; Usb circuit and ICL7660 chip be respectively the AD623 instrument amplifier provide 5V and-the 5V power supply, serial connection adjustable resistance R1 between the 1st, 8 pins of AD623 instrument amplifier, resistance by 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 enter 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 enters 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 concrete enforcement, 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, contrast
It is the needed output voltage of scalable that 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 (3)
1. Weighting sensor preamplifier circuit, its one-piece construction is a circuit board, 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, it is characterized in that :-5V power-switching circuit is by ICL7660 chip and two capacitor C 1, C2 forms, the instrument amplifier amplifying circuit is by the AD623 instrument amplifier, adjustable resistance R1 and four capacitor C 3, C4, C5 and C6 form, AD623 instrument amplifier in the instrument amplifier amplifying circuit respectively with usb circuit,-5V power-switching circuit, the sensor input interface circuit is connected with the circuit board output interface circuit, and usb circuit is connected with ICL7660 chip in the-5V power-switching circuit.
2. Weighting sensor preamplifier circuit according to claim 1, it is characterized in that: the ICL7660 chip contains eight pins, and capacitor C 1 the in-5V power-switching circuit and C2 are connected on respectively between the 2nd, 4 pins and the 5th, 3 pins of ICL7660 chip.
3. Weighting sensor preamplifier circuit according to claim 1, it is characterized in that: the AD623 instrument amplifier in the instrument amplifier amplifying circuit contains eight pins, between the 4th pin and ground that capacitor C 3 in the instrument amplifier amplifying circuit, C4 are connected in parallel on, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202888096U CN201740575U (en) | 2010-08-11 | 2010-08-11 | Weighing sensor preamplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202888096U CN201740575U (en) | 2010-08-11 | 2010-08-11 | Weighing sensor preamplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201740575U true CN201740575U (en) | 2011-02-09 |
Family
ID=43555851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202888096U Expired - Fee Related CN201740575U (en) | 2010-08-11 | 2010-08-11 | Weighing sensor preamplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201740575U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907480A (en) * | 2010-08-11 | 2010-12-08 | 富美科技有限公司 | Weighting sensor preamplifier circuit |
-
2010
- 2010-08-11 CN CN2010202888096U patent/CN201740575U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907480A (en) * | 2010-08-11 | 2010-12-08 | 富美科技有限公司 | Weighting sensor preamplifier circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110209 Termination date: 20150811 |
|
| EXPY | Termination of patent right or utility model |