CN208937055U - Magnetic navigation sensor based on instrument amplifier - Google Patents
Magnetic navigation sensor based on instrument amplifier Download PDFInfo
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- CN208937055U CN208937055U CN201821001002.2U CN201821001002U CN208937055U CN 208937055 U CN208937055 U CN 208937055U CN 201821001002 U CN201821001002 U CN 201821001002U CN 208937055 U CN208937055 U CN 208937055U
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- Prior art keywords
- instrument amplifier
- amplifier
- instrument
- magnetic
- magnetic navigation
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- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model proposes a kind of magnetic navigation sensors based on instrument amplifier, it is characterised in that: its transmission device is made of the Hall sensor and instrument amplifier being connected；The magnetic field of magnetic-path is converted voltage signal by the Hall sensor, and is transmitted to instrument amplifier；The instrument amplifier is transmitted to signal processing apparatus after amplifying voltage signal.The core of technical solutions of the utility model is: using instrument amplifier as the operational amplifier of magnetic navigation sensor.The utility model can simply and easily build circuit, reduce the error rate of circuit.It also can provide wider bandwidth under the conditions of high-gain.Operating voltage range is much larger than universal amplifier.Noiseproof feature is good.
Description
Technical field
The utility model belongs to magnetic navigation sensor field more particularly to a kind of magnetic navigation sensing based on instrument amplifier
Device.
Background technique
AGV magnetic navigation sensor refers to that one kind can identify the position for the magnetic-path completed and guide magnetic navigation small
The sensor that vehicle advances along path.In existing conventional design, transmission device general arrangement is as follows: generally being passed by Hall
Sensor and amplifier composition.Wherein the magnetic field of magnetic-path is converted into weak voltage by Hall sensor, and amplifier is faint electricity
It presses greatly, finally sends processing equipment to and handled.
Wherein, amplifier is the key that determine magnetic navigation sensor precision property, measures the Primary Reference foundation of its quality
Mainly there is the influence etc. of input impedance, output impedance, common-mode rejection ratio, input bias current, offset voltage to temperature drift.
The most commonly used scheme is amplified using the voltage that universal amplifier exports Hall element in the prior art,
Universal amplifier is made of input stage, medium voltage amplifying stage and output stage.Input stage uses differential amplifier circuit, utilizes difference
The symmetry of parallel circuit reduces influence of the temperature drift to amplifier；Medium voltage amplifying stage generally uses being total to for active load
Emitting stage amplifying circuit is formed to improve voltage gain；Output stage generally uses class AB to mend symmetrical amplifying circuit, for improving
The load capacity of integrated operational amplifier simultaneously reduces the non-linear distortion under large signal operation.The technical solution is by external difference
Parallel circuit, to reduce the influence of temperature drift that universal amplifier this body structure is limited to it, to improve the common mode of entire circuit
Inhibit ratio；For amplifier without energy-efficient treatment, power consumption is big；It is difficult to reach sufficiently high input impedance, while output impedance is small.
Utility model content
There are main technological deficiencies at three for prior art.The first, universal amplifier uses external difference channel,
Discrete component usage amount is big, and the failure rate of element is big, and volume is big, and ghost effect problem is more；The second, structure inside universal amplifier
Make relatively simple, without corresponding low power dissipation design, the required power supply loss of power is big；Third, universal amplifier are due to it
Cost of manufacture is more cheap, and the chip parameters such as similar input impedance, output impedance and the bigoted electric current of input are not superior enough, it is necessary to
Difference channel is built using the big resistance for the 10M or more for being difficult to find on the market, and 10M resistance band carrys out excessive feedback resistance
It is very easy to cause amplifier unstable.
In view of the shortcomings of the prior art and blank, the utility model use following technical scheme:
A kind of magnetic navigation sensor based on instrument amplifier, it is characterised in that: its transmission device is by the Hall that is connected
Sensor and instrument amplifier composition；The magnetic field of magnetic-path is converted voltage signal by the Hall sensor, and is transmitted to instrument
Table amplifier；The instrument amplifier is transmitted to signal processing apparatus after amplifying voltage signal.
Preferably, the Hall sensor is HW108A Hall element；The instrument amplifier is the amplification of ina128 instrument
Device.
Preferably, the output end of the positive input terminal connection HW108A Hall element of the ina128 instrument amplifier, bears defeated
Enter end ground connection, 10k Ω resistance R1 is connected between pin 1 and 8, reference voltage pin ground connection is powered using single supply；It is described
The VCC of HW108A Hall element terminates 1 μ F filter capacitor C1.
Preferably, the power supply stabilization circuit for ina128 instrument amplifier power supply uses power supply voltage stabilizing chip
TPS7350；The enabled pin of the power supply voltage stabilizing chip TPS7350 is grounded after pin connects together, and input pin connects simultaneously
The supply voltage of input, output pin connection are accessed after the 0.1 μ F high-frequency filter capacitor C4 and 10 μ F low frequency filtering capacitor C2 of connection
Output port is used as after 10 μ F low frequency filtering capacitor C3 and 0.1 μ F high-frequency filter capacitor C5 in parallel；The power supply electricity of the input
Pressure is no more than 10V.
The core of technical solutions of the utility model is: being put using instrument amplifier as the operation of magnetic navigation sensor
Big device.
Instrument amplifier is the general-purpose operation amplifier of low power consumption high-precision.Instrument amplifier is high impedance input resistance collection
At the use and error probability for inside amplifier, greatly reducing element.Their general 3 amplifier 3-op amp designs and body
Product is small and exquisite, it is made to have wide range of applications.Instrument amplifier input impedance is high, is much higher than general purpose grade amplifier.High impedance simultaneously
It is meant that minor change only occurs for electric current, i.e. power consumption is very low when voltage changes.And instrument amplifier is modified with laser
Fine tuning has low-down bias voltage, temperature drift and high cmrr, high input impedance, low noise, low linear mistake
The features such as flexible and easy to use is arranged in poor, low offset drift gain.
Technical solutions of the utility model and its preferred embodiment have the advantage that compared with the prior art
(1) amplifier section of the instrument amplifier as magnetic navigation sensor can simply and easily build circuit, reduce electricity
The error rate on road.If building circuit using differential amplifier, it usually needs multiple resistance with high accuracy and a large amount of test,
It is just able to satisfy condition required for magnetic navigation sensor, increases a large amount of economic cost and time cost.
(2) there is the ina128 instrument amplifier used current feedback input circuit can also mention even if under the conditions of high-gain
For wider bandwidth.And have the characteristics that voltage gain easy to set up, single non-essential resistance is accordingly set just according to gain formula
The selection from low gain to high-gain can be achieved, reach as high as 10000 times.The gain equation of industrial standard, circuit design are provided
And gain calculates simply.
(3) since the operating voltage range of instrument amplifier is much larger than universal amplifier, the ina128 used in scheme
For the operating temperature range of instrument amplifier from -40 DEG C to+125 DEG C, wider operating temperature range has instrument amplifier
It keeps working normally under outdoor even rugged environment, to also improve the work that AGV magnetic navigation sensor can bear
Make range.
(4) noiseproof feature is good, and the external difference channel of universal amplifier is made of multiple discrete components, noise
Source be not only in that amplifier itself, the wiring being also between each discrete component and each discrete component, to noise
Processing far away from the instrument amplifier being made of integrated circuit.The ina128 instrument amplifier used in scheme is low-frequency to make an uproar
Sound is about 0.2uVPP.Noise has large effect to the result of amplification, and the output waveform of amplifier is the amplification of useful signal
And the stack result of noise.If noise is excessive, the precision of amplifier not only will affect, but also in useful signal very little,
Useful signal can also be covered, seriously affect the precision of entire AGV magnetic navigation sensor.
(5) due to instrument amplifier provide " detection " end and " reference " end, allow at a distance detect output voltage and it is internal
The influence of resistance drop and ground wire pressure drop (IR) can minimize.
(6) low maladjustment voltage, low input bias current, low quiescent current.
Detailed description of the invention
With reference to the accompanying drawings and detailed description to the further details of explanation of the utility model:
Fig. 1 is the utility model embodiment circuit diagram；
Fig. 2 is the circuit diagram of power supply stabilization circuit in the utility model embodiment.
Specific embodiment
For the feature and advantage of this patent can be clearer and more comprehensible, special embodiment below is described in detail below:
As shown in Figure 1, in the present embodiment, the transmission device (for detecting the device of magnetic-path) of magnetic navigation sensor by
Hall sensor and the instrument amplifier composition being connected；The magnetic field of magnetic-path is converted voltage signal by Hall sensor, and
It is transmitted to instrument amplifier；Instrument amplifier is transmitted to signal processing apparatus after amplifying voltage signal.
Wherein, Hall sensor just uses HW108A Hall element；Instrument amplifier uses ina128 instrument amplifier.
In the amplifying circuit that transmission device is constituted, the positive input terminal connection HW108A Hall member of ina128 instrument amplifier
The output end of part, negative input end are grounded, and 10k Ω resistance R1, reference voltage pin ground connection, using single electricity are connected between pin 1 and 8
Source power supply；The VCC of HW108A Hall element terminates 1 μ F filter capacitor C1.
In the present embodiment, for amplifying circuit voltage gain be arranged: due to use HW108A Hall chip it is defeated
Out voltage range between 122mv to 320mv, output impedance be about 298 Ω, actual test maximum voltage value is about 522mv.
General processing module supply voltage is 3.3v, in order to increase the accuracy of sensor and the dynamic range of voltage, according to
The determining gain calculation formula of ina128 chip interior construction:
,
6 times are set by the gain of instrument amplifier, therefore taking the resistance value of R1 is 10k Ω.
As shown in Fig. 2, the power supply stabilization circuit for the power supply of ina128 instrument amplifier uses power supply voltage stabilizing chip
TPS7350；The enabled pin of power supply voltage stabilizing chip TPS7350 is grounded after pin connects together, input pin connection parallel connection
The supply voltage of input is accessed after 0.1 μ F high-frequency filter capacitor C4 and 10 μ F low frequency filtering capacitor C2, output pin connection is in parallel
10 μ F low frequency filtering capacitor C3 and 0.1 μ F high-frequency filter capacitor C5 after be used as output port；The supply voltage of input is no more than
10V。
This patent is not limited to above-mentioned preferred forms, anyone can obtain other each under the enlightenment of this patent
The magnetic navigation sensor based on instrument amplifier of kind form, all equivalent changes done according to present utility model application the scope of the patents
With modification, it should all belong to the covering scope of this patent.
Claims (4)
1. a kind of magnetic navigation sensor based on instrument amplifier, it is characterised in that: its transmission device is passed by the Hall being connected
Sensor and instrument amplifier composition；The magnetic field of magnetic-path is converted voltage signal by the Hall sensor, and is transmitted to instrument
Amplifier；The instrument amplifier is transmitted to signal processing apparatus after amplifying voltage signal.
2. the magnetic navigation sensor according to claim 1 based on instrument amplifier, it is characterised in that: the hall sensing
Device is HW108A Hall element；The instrument amplifier is ina128 instrument amplifier.
3. the magnetic navigation sensor according to claim 2 based on instrument amplifier, it is characterised in that: the ina128 instrument
The output end of the positive input terminal connection HW108A Hall element of table amplifier, negative input end are grounded, and connect 10k between pin 1 and 8
Ω resistance R1, reference voltage pin ground connection, is powered using single supply；The VCC of the HW108A Hall element terminates 1 μ F filtered electrical
Hold C1.
4. the magnetic navigation sensor according to claim 2 based on instrument amplifier, it is characterised in that: be the ina128
The power supply stabilization circuit of instrument amplifier power supply uses power supply voltage stabilizing chip TPS7350；The power supply voltage stabilizing chip TPS7350's
Enabled pin is grounded after pin connects together, input pin connection 0.1 μ F high-frequency filter capacitor C4 and 10 μ F low frequencies in parallel
The supply voltage of input, output pin connection 10 μ F low frequency filtering capacitor C3 and 0.1 μ F high in parallel are accessed after filter capacitor C2
Output port is used as after frequency filter capacitor C5；The supply voltage of the input is no more than 10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821001002.2U CN208937055U (en) | 2018-06-27 | 2018-06-27 | Magnetic navigation sensor based on instrument amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821001002.2U CN208937055U (en) | 2018-06-27 | 2018-06-27 | Magnetic navigation sensor based on instrument amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208937055U true CN208937055U (en) | 2019-06-04 |
Family
ID=66715554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821001002.2U Expired - Fee Related CN208937055U (en) | 2018-06-27 | 2018-06-27 | Magnetic navigation sensor based on instrument amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208937055U (en) |
-
2018
- 2018-06-27 CN CN201821001002.2U patent/CN208937055U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190604 |