CN107769786A - A kind of miniature weighing and force-measuring transducer signal conditioning circuit - Google Patents
A kind of miniature weighing and force-measuring transducer signal conditioning circuit Download PDFInfo
- Publication number
- CN107769786A CN107769786A CN201610691119.7A CN201610691119A CN107769786A CN 107769786 A CN107769786 A CN 107769786A CN 201610691119 A CN201610691119 A CN 201610691119A CN 107769786 A CN107769786 A CN 107769786A
- Authority
- CN
- China
- Prior art keywords
- signal conditioning
- force
- conditioning circuit
- circuit
- measuring transducer
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/50—Analogue/digital converters with intermediate conversion to time interval
- H03M1/54—Input signal sampled and held with linear return to datum
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Amplifiers (AREA)
Abstract
A kind of miniature weighing and force-measuring transducer signal conditioning circuit, suitable for fields of measurement.Signal conditioning circuit is made up of power circuit, AD623 amplifying circuits, filtering and amplifying circuit.The signal conditioning circuit using AD623 as core, single supply power supply are devised, a gain resistor completes amplification, and circuit structure is compact, small volume, reduces the usage quantity of component, reduces the design size of circuit board, is easy to vola to install.
Description
Art
The present invention relates to a kind of miniature weighing and force-measuring transducer signal conditioning circuit, suitable for fields of measurement.
Background technology
By development for many years, pressure sensor has turned into a kind of important devices of industry and medical treatment detection.Pressure sensing
Device is widely used：Weighed used in down-hole pressure information gathering, medical treatment detection, the measurement of line-of-sight weapon vertical target dispersion, industry spot
With two sufficient exoskeleton robot plantar pressures measurements etc..Pressure sensor uses bridge type circuit structure, has excellent
The linearity and sensitivity, and temperature-compensating performance well.But a microstrain electric bridge output only has 2mV or so, even in full
In the case of load, the maximum output of foil gauge also only counts l0mV, changes the A/D of signal and is limited, it is impossible to good completion signal
Collecting work.Therefore, it is necessary to the signal of pressure sensor output effectively amplify and nurse one's health, a kind of miniature survey of weighing of design
Force sensor signals modulate circuit has stronger Practical significance.
The content of the invention
The present invention provides a kind of miniature weighing and force-measuring transducer signal conditioning circuit, and circuit structure is compact, small volume, single electricity
Source powers, and a gain resistor completes amplification, reduces the usage quantity of component, reduces the design size of circuit board, just
Installed in vola.
The technical solution adopted in the present invention is.
Miniature weighing and force-measuring transducer signal conditioning circuit is by power circuit, AD623 amplifying circuits, filtering and amplifying circuit group
Into.The signal conditioning circuit using AD623 as core, single supply power supply are devised, a gain resistor completes amplification, reduces member
The usage quantity of device, the design size of circuit board is reduced, is easy to vola to install.
The power circuit uses LM2931 voltage calibrations module to provide+5V for pressure sensor and AD623 and precisely power
Voltage.LM2931 has different model, is divided into fixed voltage output and adjustable voltage output, there is low-down quiescent current, exports
Electric current has short-circuit protection more than 100mA.Output fixed voltage is used to design completion+5V power supply moulds for+5V LM2931AM-5
Block.In order to keep voltage stability, input and output for power module have all added decoupling capacitor, wherein power output end electricity
Capacitance is at least 100uF.
In the AD623 amplifying circuits, AD623 is two-stage structure for amplifying, and the first order is that two inputs amplifier U1 and U2 are pressed
Homophase input connection forms, and the second level is that an output amplifier U3 forms differential amplifier circuit.In first order circuit, pressure passes
Sensor is defeated
The positive signal and negative signal gone out are added in AD623 in-phase end and end of oppisite phase respectively.It is a difference in that and inputs amplifier at two
Two PNP transistors are added to provide common-mode signals to two input amplifiers, and to meet as voltage buffer respectively before
The requirement of power supply limit input discharge circuit structure.Output amplifier is used for differential voltage being converted into single ended voltage, and it is also to above
The common-mode signal of two input amplifier outputs plays inhibitory action, is beneficial to the performance for improving whole circuit.
The filtering and amplifying circuit designs low pass to disclosure satisfy that sampling thheorem while good filter effect is obtained
The cut-off frequency of wave filter is 9.7K.R1 and C3 (same, R2 and C4) composition low pass filter.Resistance R1 is 91K, then calculates
C3 capacitances are 180pF.91K resistance is sufficiently large, can be effectively isolated the input from condenser network, while the circuit noise brought
Influence also very small.For the common mode inhibition capacity of hold amplifier, electric capacity C3 and C4 admissible error need to reach 5% or more
It is good.R1/R2 and C3/C4 constitutes bridge circuit, and their input for outputting through amplifier, C3 and C4 have any mismatch,
It will all make bridge uneven, and reduce common mode inhibition capacity.
The beneficial effects of the invention are as follows：Circuit structure is compact, small volume, reduces the usage quantity of component, reduces
The design size of circuit board, is easy to vola to install.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the power circuit of the present invention.
Fig. 2 is the AD623 amplifying circuits of the present invention.
Fig. 3 is the filtering and amplifying circuit of the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Such as Fig. 1, power circuit uses LM2931 voltage calibrations module to provide+5V for pressure sensor and AD623 and precisely supply
Piezoelectric voltage.LM2931 has different model, is divided into fixed voltage output and adjustable voltage output, there is low-down quiescent current, defeated
Go out electric current more than 100mA, there is short-circuit protection.Output fixed voltage is used to design completion+5V power supply moulds for+5V LM2931AM-5
Block.In order to keep voltage stability, input and output for power module have all added decoupling capacitor, wherein power output end electricity
Capacitance is at least 100uF.
Such as Fig. 2, in AD623 amplifying circuits, AD623 is two-stage structure for amplifying, and the first order is two input amplifiers U1 and U2
Formed by homophase input connection, the second level is that an output amplifier U3 forms differential amplifier circuit.In first order circuit, pressure
The positive signal and negative signal of sensor output are added in AD623 in-phase end and end of oppisite phase respectively.It is a difference in that in two inputs
Before amplifier respectively plus two PNP transistors are used as voltage buffer, so as to two input amplifiers offer common-mode signals, and
Meet the requirement of power supply limit input discharge circuit structure.Output amplifier is used for differential voltage being converted into single ended voltage, and it is also right
Above the common-mode signal of two input amplifier outputs plays inhibitory action, is beneficial to the performance for improving whole circuit.
Such as Fig. 3, filtering and amplifying circuit designs low to disclosure satisfy that sampling thheorem while good filter effect is obtained
The cut-off frequency of bandpass filter is 9.7K.R1 and C3 (same, R2 and C4) composition low pass filter.Resistance R1 is 91K, then calculates
It is 180pF to go out C3 capacitances.91K resistance is sufficiently large, can be effectively isolated the input from condenser network, while the circuit brought is made an uproar
Sound shadow is rung also very small.For the common mode inhibition capacity of hold amplifier, electric capacity C3 and C4 admissible error need to reach 5% or
More preferably.R1/R2 and C3/C4 constitute bridge circuit, their input for outputting through amplifier, C3 and C4 have it is any not
Match somebody with somebody, will all make bridge uneven, and reduce common mode inhibition capacity.
Claims (7)
1. a kind of miniature weighing and force-measuring transducer signal conditioning circuit, it is characterized in that：Described signal conditioning circuit is by power supply electricity
Road, AD623 amplifying circuits, filtering and amplifying circuit composition.
2. a kind of miniature weighing and force-measuring transducer signal conditioning circuit according to claim 1, it is characterized in that：The power supply
Circuit uses LM2931 voltage calibrations module to provide the accurate supply voltages of+5V for pressure sensor and AD623, is fixed using output
The LM2931AM-5 that voltage is+5V designs completion+5V power modules.
3. a kind of Rb atom frequency marking circuit according to claim 1, it is characterized in that：In described AD623 amplifying circuits,
AD623 is two-stage structure for amplifying, and the first order is that two input amplifier U1 and U2 are formed by homophase input connection, and the second level is one
Export amplifier U3 composition differential amplifier circuits.
4. a kind of miniature weighing and force-measuring transducer signal conditioning circuit according to claim 1, it is characterized in that：Described
In AD623 amplifying circuits, the positive signal and negative signal of pressure sensor output are added in AD623 in-phase end and end of oppisite phase respectively.
5. a kind of miniature weighing and force-measuring transducer signal conditioning circuit according to claim 1, it is characterized in that：It is described
In AD623 amplifying circuits, before two input amplifier respectively plus two PNP transistors are as voltage buffer, so as to two
Individual input amplifier provides common-mode signal.
6. a kind of miniature weighing and force-measuring transducer signal conditioning circuit according to claim 1, it is characterized in that：The amplification
In filter circuit, R1 and C3 (same, R2 and C4) composition low pass filter, the cut-off frequency for designing low pass filter is 9.7K.
7. a kind of miniature weighing and force-measuring transducer signal conditioning circuit according to claim 1, it is characterized in that：The amplification
In filter circuit, R1/R2 and C3/C4 constitute bridge circuit, their input for outputting through amplifier, and C3 and C4 have any
Mismatch, will all make bridge uneven, and reduce common mode inhibition capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610691119.7A CN107769786A (en) | 2016-08-20 | 2016-08-20 | A kind of miniature weighing and force-measuring transducer signal conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610691119.7A CN107769786A (en) | 2016-08-20 | 2016-08-20 | A kind of miniature weighing and force-measuring transducer signal conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107769786A true CN107769786A (en) | 2018-03-06 |
Family
ID=61262533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610691119.7A Pending CN107769786A (en) | 2016-08-20 | 2016-08-20 | A kind of miniature weighing and force-measuring transducer signal conditioning circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107769786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520643A (en) * | 2018-11-30 | 2019-03-26 | 安徽云汉智能科技有限公司 | A kind of faint ess-strain signal measurement sensor |
-
2016
- 2016-08-20 CN CN201610691119.7A patent/CN107769786A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520643A (en) * | 2018-11-30 | 2019-03-26 | 安徽云汉智能科技有限公司 | A kind of faint ess-strain signal measurement sensor |
| CN109520643B (en) * | 2018-11-30 | 2020-12-22 | 安徽云汉智能科技有限公司 | Sensor for measuring weak stress-strain signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102128966B (en) | Rogowski coil-based integrator circuit for electronic current transformer | |
| CN101820256A (en) | Sensor signal amplifying and conditioning circuit | |
| CN103858014A (en) | Readout circuit for self-balancing capacitor bridge | |
| CN101975893A (en) | Differential capacitance detection circuit based on instrument amplifier and detection method thereof | |
| CN103684408A (en) | Capacitance-type sensor interface circuit | |
| CN102769436A (en) | Inexpensive micro-power-consumption miniaturized signal conditioning module applicable to portable apparatuses | |
| CN106556717A (en) | A kind of highly sensitive accelerometer weak signal extraction circuit | |
| CN203785751U (en) | Weighing circuit and electronic scale possessing same | |
| CN101441236A (en) | Capacity sensor circuit based on Wien bridge and phase-locked loop | |
| CN107769786A (en) | A kind of miniature weighing and force-measuring transducer signal conditioning circuit | |
| CN203416227U (en) | Small signal amplification circuit | |
| CN205509991U (en) | Amplifier circuit and sensor signal processing apparatus | |
| CN202948026U (en) | Differential capacitance voltage conversion circuit and acceleration sensor detection system | |
| CN209590068U (en) | Constant current source power supply system | |
| CN206740279U (en) | A kind of pressure measurement circuitry | |
| CN102981021A (en) | Differential capacitance-voltage conversion circuit and acceleration sensor detection system | |
| CN201682460U (en) | Sensor signal amplification and conditioning circuit | |
| CN203933538U (en) | A kind of intelligent small voltage is measured amplifying circuit | |
| CN104038161A (en) | Module for amplifying signals in gas concentration detection system of transformer substation | |
| CN103405221A (en) | Temperature compensation method of pressure sensor for blood pressure measurement | |
| CN203561373U (en) | Measuring circuit of capacitive transducer | |
| CN203883778U (en) | Amplification module for detected signals in substation gas concentration detection system | |
| CN206638242U (en) | A kind of interface circuit of Campatible sensor | |
| CN203216569U (en) | High-precision underground water level monitoring device | |
| CN212030713U (en) | Vehicle weighing detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180306 |