CN109708568A - A kind of signal processing apparatus for hall device angle detection system - Google Patents
A kind of signal processing apparatus for hall device angle detection system Download PDFInfo
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- CN109708568A CN109708568A CN201811472746.7A CN201811472746A CN109708568A CN 109708568 A CN109708568 A CN 109708568A CN 201811472746 A CN201811472746 A CN 201811472746A CN 109708568 A CN109708568 A CN 109708568A
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Abstract
The invention discloses a kind of signal processing apparatus for hall device angle detection system, benchmark source module and signal processing front-end module are separately connected hall device angular transducer, benchmark source module provides stable driving source for hall device angular transducer, hall device angular transducer measures the angle information of system, and it is sent to signal processing front-end module, the analog signal received is realized noise reduction process and impedance matching by signal processing front-end module in prescribed bandwidth, analog signal that treated is quantified as digital signal through analog-digital converter, on the one hand the digital signal of quantization is carried out processing operation by data processing module, be converted to corresponding angle value in hall device angle detection system, information exchange is carried out by communication interface modules and external equipment；On the other hand control signal needed for generating analog-digital converter carries out corresponding parameter setting to analog-digital converter.
Description
Technical field
The invention belongs to angle detection technique fields, are related to a kind of signal processing for hall device angle detection system
Device.
Background technique
Angle measuring sensor generally has contact and contactless two methods.Contact angle measuring sensor due to
There are Mechanical Contact, service life and measurement accuracy are greatly limited；Magnetic effect (magnetoelectricity conversion) based on hall device
Contactless angle magnetic susceptibility sensor, small in size due to its sound construction, light-weight, the service life is long, easy for installation, power consumption
It is small, the advantages that frequency is high, it is widely used in various engineering measurement fields.
Currently, the magnitude for the angle signal for needing to detect is increasingly in the fields such as space flight, air line and Industry Control
It is small, it is desirable that the signal processing apparatus of higher precision.In the angle detection system of the Hall linear unit of use, on the one hand, by
It is the lesser analog quantity of amplitude in output signal, can whether signal processing be reasonable, obtain that resolution ratio is higher, reliability is stronger
Angle measurement directly influences the precision of detection；Still further aspect, with the miniaturization further of product, to signal processing device
The size set requires also more and more compacter.Therefore, needed in hall device angle detection system a kind of high bandwidth, high-precision,
The signal processing apparatus of high dynamic range, high integration.
Summary of the invention
(1) goal of the invention
The object of the present invention is to provide a kind of signal processing apparatus for hall device angle detection system, the devices
The angle value that hall device angular transducer can be accurately detected out, the analog signal that hall device angular transducer is exported
Effectively noise reduction process is carried out, is transferred to external equipment to the acquisition of output signal real-time perfoming after carrying out quantization and data processing.
(2) technical solution
In order to solve the above technical problem, the present invention provides the signal processing devices for hall device angle detection system
It sets comprising benchmark source module, signal processing front-end module, analog-to-digital conversion module, data processing module, communication interface modules,
Benchmark source module and signal processing front-end module are separately connected hall device angular transducer, and benchmark source module is hall device angle
Degree sensor provides stable driving source, and hall device angular transducer measures the angle information of system, and is sent at signal
Front-end module is managed, the analog signal received is realized noise reduction process and impedance by signal processing front-end module in prescribed bandwidth
Match, analog signal that treated is quantified as digital signal through analog-digital converter, and data processing module is on the one hand by the number of quantization
Signal carries out processing operation, is converted to corresponding angle value in hall device angle detection system, by communication interface modules with
External equipment carries out information exchange；On the other hand control signal needed for generating analog-digital converter carries out phase to analog-digital converter
The parameter setting answered.
(3) beneficial effect
The signal processing apparatus of hall device angle detection system is used for provided by above-mentioned technical proposal, link is clear,
High-precision angle measurement, and compact are realized within the scope of very wide frequency domain, flexible and convenient to use, adjustable gain can
User is facilitated to find optimal running parameter in different operating conditions and application places.
Detailed description of the invention
Fig. 1 is the functional block diagram of the signal processing apparatus based on hall device angle detection system.
Fig. 2 is signal processing front-end module schematic block circuit diagram.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention
Specific embodiment is described in further detail.
Design objective of the present invention for the signal processing apparatus of hall device angle detection system is as follows:
It is small in size: 4CM*4CM*2CM；
It is light-weight: to be not more than 0.1Kg；
Small power consumption: it is not more than 1W；
Under the conditions of high bandwidth, signal-to-noise ratio higher: 50dB (bandwidth 70kHz) is realized；
Electric interfaces are simple, and compatibility is strong (communication is 422 interface of standard, single 12V power supply)；
It is at low cost, high reliablity.
As shown in Figure 1, a kind of signal processing apparatus for hall device angle detection system of the present invention includes power supply mould
Block, benchmark source module, signal processing front-end module, analog-to-digital conversion module, data processing module, communication interface modules, at signal
Managing front-end module includes two parts of differential amplification and low-pass filtering.Benchmark source module uses high precision reference source module.
The connection type of each module are as follows:
The power module is used to being converted to external power supply into stable power-supplying power supply required for each module inside device；
The signal processing front-end module and hall device angular transducer, high precision reference source module, analog-to-digital conversion mould
Block is connected；
The analog-to-digital conversion module is connected with signal processing front-end module, data processing module；
The data processing module is connected with analog-to-digital conversion module, communication interface modules；
The communication interface modules is connected with data processing module and external equipment；
The high precision reference source module is connected with hall device angular transducer, signal processing front-end module.
The major function of each module are as follows:
The power module supplies required for each module of the drive dynamic control device for being converted to external input power
Power supply.
Hall device angular transducer measures the angle information of system, and is sent to signal processing front-end module, the letter
Number processing front-end module be the present apparatus key control unit, the digitized processing of hall device angle detection system read output signal
In process, signal processing front-end module is the front end of entire signal processing system, exports analog signal through analog-digital converter
It is quantified as digital signal, digital processing module thereafter is hardly interfered by non-ideal factors such as noises, therefore signal processing
The performance of analog front-end module directly determines the signal-to-noise ratio of entire signal processing in device.
Signal processing front-end module includes two parts of differential amplification and low-pass filtering, and function is by hall device angle
The analog signal of sensor realizes noise reduction process and impedance matching in prescribed bandwidth.The present apparatus selects the high common mode of difference amplifier
Inhibit the difference amplifier of ratio, the output signal of input anode connection hall device angular transducer, input negative terminal connects high-precision
The output end for spending benchmark source module, obtains suitable reference voltage in the way of electric resistance partial pressure, can be effectively by the method
Contain null offset, and increase the ability for inhibiting noise and interference, gain resistor selects adjustable resistor to meet different application
The gain of hall device angular transducer is arranged in environment.Low-pass filter selects RC filtering to reduce the volume of device, while
Increasing matched resistance capacitance between differential output signal reduces external interference.
The processed analog signal of signal processing front-end module is converted digital signal by the analog-to-digital conversion module.
Digital quantity of the data processing module on the one hand by analog-to-digital conversion module quantization carries out processing operation, is converted to suddenly
Corresponding angle value in your device angles detection system carries out information exchange by communication interface modules and external equipment；It is another
Control signal needed for aspect generates analog-digital converter carries out corresponding parameter setting to analog-digital converter.
The communication interface modules realizes the communication function of external equipment and signal processing apparatus, and present apparatus communication interface is
422 interface of standard.
The high precision reference source module provides stable driving source for hall device angular transducer, needs in environment
Sharp pulse have good inhibiting effect, unnecessary interference caused by avoiding because of power-supply fluctuation, to improve hall device angle
Spend the stability of sensor output signal.
As shown in Figure 1, a kind of functional block diagram of the signal processing apparatus based on hall device angular transducer detection system
The specific embodiment of each module is as follows.
Power module is the guarantee of whole system steady operation, according to each corresponding electricity of component power reguirements design of circuit
Conversion module is pressed, module is realized by the way of DC/DC+LDO.Electricity needed for obtaining each module is realized using DC/DC LTC3621
Pressure.The Ripple Noise (LT1763 noise figure is 20uVrms) of power supply is reduced using LDO LT1763, it is smart to improve stablizing for power supply
Degree.
The signal processing front-end module is the key control unit of the present apparatus, includes differential amplification and low-pass filtering two
Part, Fig. 2 are signal processing front-end module functional block diagrams.Differential amplification selects device THS4520, and such chip has high band
The features such as wide, high spurious-free dynamic range, low noise, specific targets are as follows: input voltage noise is 2.2nV/Hz1/2；Bandwidth is
620MHz；Slew rate is 570V/ μ s；Common-mode rejection ratio 84dB；Single supply+5V power supply.Low-pass filter is wanted for 70KHz bandwidth
It asks, RC parameter should meet:
Signal processing front-end module parameter list is shown in Table 1.
1 signal processing front-end module parameter list of table
The processed analog signal of signal processing front-end module is converted digital signal by the analog-to-digital conversion module, selects
Device is ADS8354, and 16 bit resolution of feature, for sampling rate maximum up to 700kSPS, signal-to-noise ratio 93dB, it is complete poor to support
Dividing simulation input, comprising can be used for system-level gain calibration there are two the reference voltage source that can be independently programmable, and being furnished with one
A flexible serial line interface that can be run in wide power supply district, to easily realize the communication with a variety of host controllers.
The data processing module selects single-chip microcontroller as main control chip, realizes data processing, analog-digital converter control, leads to
Believe the functions such as agreement.Comprehensively consider interface requirements, single-chip microcontroller selects the TM4C123AH6PMI of TI company production.Model MCU's
Feature has: ARM-M4F kernel, monocycle multiplying order and hardware divider；80MHz running frequency, 256K monocycle FLASH,
32K monocycle SRAM；8 UART kernels, four SPI interfaces, can satisfy the requirement of the present apparatus.
The communication interface modules is 422 interface of standard, RS422 interface be a kind of single machine send, multimachine it is received it is unidirectional,
Balance transmission specification, data-signal use differential transfer mode.Interface chip selects ADM3490ARZ, RS422 interface circuit
Supply voltage is+3.3V.Peripheral circuit signaling interface end build-out resistor is 110 Ω, and increases by 750 Ω pull-up resistors and drop-down electricity
Resistance.
The high precision reference source module provides stable driving source for hall device angular transducer, and ADR445ARM is
A 2.5 μ Vpp/V noise, 3ppm/ DEG C of drift standard of precision voltage, output voltage pass through capacitor filtering, keep output voltage more steady
Fixed, ripple is smaller.Output drive source is obtained into suitable reference voltage using electric resistance partial pressure mode simultaneously, to difference amplifier
Negative terminal can effectively contain null offset by the method, and increase the ability for inhibiting noise and interference.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of signal processing apparatus for hall device angle detection system, which is characterized in that including benchmark source module, letter
Number processing front-end module, analog-to-digital conversion module, data processing module, communication interface modules, before benchmark source module and signal processing
End module is separately connected hall device angular transducer, and benchmark source module provides stable excitation for hall device angular transducer
Source, hall device angular transducer measure the angle information of system, and are sent to signal processing front-end module, signal processing front end
The analog signal received is realized noise reduction process and impedance matching by module in prescribed bandwidth, and analog signal that treated is through mould
Number converter is quantified as digital signal, on the one hand the digital signal of quantization is carried out processing operation, is converted to by data processing module
Corresponding angle value in hall device angle detection system carries out information exchange by communication interface modules and external equipment；Separately
On the one hand control signal needed for generating analog-digital converter carries out corresponding parameter setting to analog-digital converter.
2. being used for the signal processing apparatus of hall device angle detection system as described in claim 1, which is characterized in that described
Signal processing front-end module includes differential amplification unit and low-pass filter unit.
3. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 2, which is characterized in that described
Differential amplification unit selects the difference amplifier of high cmrr of the common-mode rejection ratio greater than 50, and input anode connects Hall device
The output signal of part angular transducer, input negative terminal are connected the output end of benchmark source module, institute are obtained in the way of electric resistance partial pressure
The reference voltage needed.
4. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 3, which is characterized in that described
Low-pass filter selects RC filter.
5. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 4, which is characterized in that also wrap
It includes: power module, for external power supply to be converted to stable power-supplying power supply required for each module inside device.
6. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 5, which is characterized in that described
Communication interface modules uses 422 interface of standard.
7. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 6, which is characterized in that described
Difference amplifier selects device THS4520, common-mode rejection ratio 84dB.
8. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 7, which is characterized in that described
It is ADS8354 model analog-digital converter that analog-to-digital conversion module, which selects device,.
9. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 8, which is characterized in that described
Data processing module selects single-chip microcontroller as main control chip, and single-chip microcontroller selects TM4C123AH6PMI model single-chip microcontroller.
10. being used for the signal processing apparatus of hall device angle detection system as claimed in claim 9, which is characterized in that institute
It states benchmark source module and selects ADR445ARM model a reference source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112556732A (en) * | 2020-11-19 | 2021-03-26 | 珠海格力电器股份有限公司 | Magnetoelectric angle sensor, encoder and motor |
| CN115421416A (en) * | 2022-08-29 | 2022-12-02 | 中国科学院光电技术研究所 | Digital single rod based on Hall element |
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|---|---|---|---|---|
| CN112556732A (en) * | 2020-11-19 | 2021-03-26 | 珠海格力电器股份有限公司 | Magnetoelectric angle sensor, encoder and motor |
| CN115421416A (en) * | 2022-08-29 | 2022-12-02 | 中国科学院光电技术研究所 | Digital single rod based on Hall element |
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Application publication date: 20190503 |