CN206369549U - Inductosyn signal solution code system - Google Patents
Inductosyn signal solution code system Download PDFInfo
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- CN206369549U CN206369549U CN201621455609.9U CN201621455609U CN206369549U CN 206369549 U CN206369549 U CN 206369549U CN 201621455609 U CN201621455609 U CN 201621455609U CN 206369549 U CN206369549 U CN 206369549U
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Abstract
The utility model provides a kind of inductosyn signal solution code system, and it includes digital control circuit, and for exporting excited signal so that the sine and cosine winding of inductosyn is under the coupling of excited signal, generation is loaded with the cosine and sine signal of positional information；Precise amplifying circuit, the amplitude of the cosine and sine signal for being loaded with positional information for inductosyn to be exported is amplified to volt level；Lock-in amplifier, is connected with precise amplifying circuit, for extracting the signal with excited signal with frequency from the cosine and sine signal amplified through signal amplification circuit, filters other garbage signals beyond magnet excitation frequency；Digital control circuit is also connected with lock-in amplifier, for being decoded the signal that lock-in amplifier is exported to obtain positional information.The utility model has a relatively low cost and higher flexibility, and the filtering of lock-in amplifier can guarantee that the precision of decoding.
Description
Technical field
The utility model is related to signal processing technology field, more particularly to a kind of inductosyn signal solution code system.
Background technology
In fields such as military, industry, daily life and Aero-Space, the application of inductosyn is increasingly by weight
Depending on inductosyn is the displacement transducer that angle or linear displacement signal are transformed to alternating voltage, and also known as plane formula revolves
Change depressor.From principle, its (referred to as rotation becomes) and unsubstantial difference with rotary transformer, but with rotation change difference
It is, its stator is not mounted within the winding in the iron core slot of cylindrical shape and cylinder with rotor, and is analogous to printing electricity
" the printing winding " of road plate, the winding that such " winding " becomes with rotation is compared, and rotary inertia and quality are greatly reduced, therefore extensively
Applied to the locating and tracking of high-precision servo turntable, radar antenna, cannon and radio telescope, precise numerical control machine and
In high precision position detecting system.
But, while reducing quality with inertia, another question is brought, is exactly the output letter of inductosyn
Number, that is, the cosine and sine signal for being loaded with positional information only has millivolt (mV) rank, so relative to rotary transformer, adding decoding
Difficulty, especially needing the use occasion of high precision position signal.
Utility model content
The purpose of this utility model is to provide a kind of inductosyn signal solution code system, larger to solve decoding difficulty
The problem of.
In order to solve the above problems, the utility model provides following technical scheme：
A kind of inductosyn signal solution code system, it includes：Digital control circuit, precise amplifying circuit mutually amplify with lock
Device；The digital control circuit is used to export excited signal so that the sine and cosine winding of inductosyn is in the excited signal
Under coupling, the cosine and sine signal for being loaded with positional information is produced；The precise amplifying circuit is used for the load for exporting inductosyn
The amplitude for having the cosine and sine signal of positional information is amplified to volt level；The lock-in amplifier is connected with the precise amplifying circuit,
For accordingly being extracted with excited signal with the signal of frequency from the cosine and sine signal amplified through the signal amplification circuit
Sine and cosine amplitude signal；The digital control circuit is also connected with the lock-in amplifier, for defeated to the lock-in amplifier
The sine and cosine amplitude signal gone out is decoded to obtain positional information.
In inductosyn signal solution code system as described above, it is preferable that the precise amplifying circuit includes：Low pass
Filter circuit, is connected with the inductosyn, is RC filter circuits；Amplifying circuit, is connected with the RC filter circuits.
In inductosyn signal solution code system as described above, it is preferable that the chip model of the amplifying circuit is
AD625。
In inductosyn signal solution code system as described above, it is preferable that the lock-in amplifier is locked for orthogonal type
Phase amplifier.
In inductosyn signal solution code system as described above, it is preferable that the digital control circuit is believed for numeral
Number process chip.
In inductosyn signal solution code system as described above, it is preferable that the frequency of the excited signal is 10Hz.
Analysis is understood, the utility model proposes one kind using DSP as control main control unit, with reference to accurate operational amplification circuit
The high-precision resolving scheme of corresponding signal processing is carried out with lock-in amplifier.Decoded with hardware after general direct signal amplification
Scheme is compared, and the utility model has relatively low cost and higher flexibility, and the filtering of lock-in amplifier can guarantee that solution
The precision of code.
Brief description of the drawings
Fig. 1 is the general frame of the utility model embodiment；
Fig. 2 is the signal amplification process schematic diagram of the utility model embodiment；
Fig. 3 is the lock phase amplification process schematic diagram of the utility model embodiment；
Fig. 4 is the lock-in amplifier signal processing flow figure of the utility model embodiment；
Fig. 5 is the sinusoidal signal lock-in amplifier schematic diagram of the utility model embodiment；
Fig. 6 is the orthogonal type lock-in amplifier schematic diagram of the utility model embodiment；
Fig. 7 is the decoding schematic diagram of the utility model embodiment；
For the excited signal of the utility model embodiment circuit occurs for Fig. 8；
Fig. 9 is the high-precision amplification circuit of the utility model embodiment；
Figure 10 is the signal generating circuit of the utility model embodiment；
Figure 11 is the lock-in amplifier of the utility model embodiment.
Embodiment
The utility model is described in further details with reference to the accompanying drawings and detailed description.
For principle of the present utility model, the operation decoded to inductosyn can be divided into three steps：Signal
Amplification procedure, lock phase amplification procedure and decoding step.For inductosyn output signal it is weak the characteristics of, put respectively
Greatly, filtering and decoding process.Especially in filtering link, the faint letter of specific frequency can be extracted in noise using lock-in amplifier
Number the characteristics of, effectively filtered to measured signal, and the application of orthogonal type lock-in amplifier can avoid what phase was brought
Problem.
Based on this, such as Fig. 1, in the system that the utility model is provided, hardware component mainly includes three big modules：Numeral control
Circuit processed, precise amplifying circuit, lock-in amplifier.Wherein, in digital control circuit, with DSP (Digital Signal
Processing, digital signal processor) as the digit chip of regulation and control master unit, such as model TMS320X2812, it includes
There is provided 3.3V and 1.8V voltages, the certain frequency for TMS320X2812 is worked for the minimum system being made up of components such as crystal oscillators
Clock signal.Level shifting circuit 74ACT245, the PWM waveform that DSP output amplitudes 3.3V PWM waveform is converted into 5V is believed
Number, improve chip drives ability.The high-precision external sampling chip ADS7864 of sampling module, outside mould can be taken in real time
Intend signal, be converted to and DSP processing is sent to by data/address bus again after data signal.Programming mouthful circuit JTAG is emulated, can be realized
The program burn writing of chip and online procedure simulation, improve development ability.And it is used as the excitatory cores of OSC-15801 of excitatory module
Piece, the circuit connection signal of the excitatory chips of OSC-15801 is as shown in figure 8, pin PAOUT is the pin that excited signal is exported.
Precise amplifying circuit includes：RC filter circuits and amplifying circuit, amplifying circuit is by high accuracy, high cmrr
Instrument amplifier AD625 and its peripheral circuit composition.Amplifier AD625 circuit connection diagram in figure as shown in figure 9, wait to put
Big signal is sinusoidal signal to be measured, and pin Vout is the pin of the sinusoidal signal sin_out outputs after amplification,
Lock-in amplifier includes：Chip AD9850, it is that occurred according to the signal of direct digital synthesis technique principle design
Chip, based on direct synthesizer, the synthesizer applies advanced CMOS technology, it is possible to use DSP pins are controlled to it
System.As shown in Figure 10, LPF is low-pass filter circuit to signal generator chip AD9850 circuit connection diagram in figure.Chip
AD630, Inner Constitution includes two operational amplifier As and B, switching switch, comparator COMP (containing triode T), output integration
Compensating electric capacity in amplifier, piece, resistance in piece.Its advantages, when designing lock-in amplifier, AD630 is used as phase sensitive detection
Device is used, i.e. multiplier, completing the design of correlation detecting circuit.
It will be appreciated by those skilled in the art that although foregoing description is related to chip type, the utility model not with
This is limited.
As shown in figure 1, digital control circuit exports the sinusoidal excited signal of high frequency by its excitatory module, it is preferable that should
The frequency of signal is 10kHz.The amplitude of the sinusoidal excited signal can be 10V.The sine and cosine winding of inductosyn is excitatory
Under the coupling of signal, the cosine and sine signal for being loaded with positional information can be produced：
Excited signal：Um=A ' sin ω t (1)
Wherein, ω represents the angular frequency of excited signal；
Inductosyn output signal：
Wherein, Usin、UcosIn α be position angle signal, for representing positional information, but be due to Usin、UcosSignal is only
There are mV grades, and be particularly easy to by noise jamming, so needing by special processing, that is, be provided with following processing step
Suddenly.
(1) Part I：Signal amplifies
Signal enhanced processing process is as shown in Fig. 2 the effect of this process is the amplitude for improving sine and cosine output signal
(being amplified to V grades by mV ranks), keeps signal interference-free as far as possible in the process, but main purpose is to amplify.The letter
Number method and step can be handled by precise amplifying circuit, and the low-pass filter circuit of precise amplifying circuit uses RC filter circuits,
The amplifier circuit of precise amplifying circuit (or pre-amplification circuit) uses the instrument with high accuracy and high cmrr
Amplifier AD625, and its peripheral circuit is designed, from high-precision configuration resistance, it can easily and flexibly select times of amplification
Number.
The signal obtained after amplification is：
Because position angle α is relative very slow compared with magnet excitation frequency (10kHz) change, can in signal processing
It is assumed to be the signal after invariant, therefore amplification to be represented by：
Wherein, VAFor sinusoidal magnitude value signal, VA' it is cosine amplitude signal.
(2) Part II：Lock mutually amplifies
In Detection of Weak Signals field, compared with adjoint noise, signal amplitude typically all very little, even μ V to nV amounts
Level, general means are difficult accurately to extract small-signal, so needing to be filtered signal processing.Inspection of the prior art
Survey method is mostly using bandpass filter as means of filtering, but the method has drawback, it is necessary to by the very narrow of bandwidth Design, right
Very high requirement is designed with, and is easily influenceed by temperature, voltage.Therefore, in the utility model implementation, by using
Lock-in amplifier is accordingly extracted with excited signal with frequency in obtained cosine and sine signal is amplified through signal amplification procedure
The sine and cosine amplitude signal of signal (i.e. useful signal), filters the garbage signal beyond magnet excitation frequency, in particular by signal
Enter horizontal lock amplification, filtering to obtain.Lock the processing procedure mutually amplified as shown in Figure 3.Lock-in amplifier is to be based on cross-correlation test
Principle design, its core is phase sensitive detection, and relevant principle is repeated no more.The signal processing of lock-in amplifier is such as
, it is necessary to reference signal all the way shown in Fig. 4, this reference signal have to have with pending cosine and sine signal as frequency
(such as all it is
10kHz), can be sinusoidal or square wave, here by taking sine as an example.
It is the processing procedure (decoded signal is sine and cosine two paths of signals) of sinusoidal signal all the way, here with just shown in Fig. 5
Exemplified by string signal, cosine signal is by that analogy.The phase sensitive detector that actual circuit is used is AD630, and signal generator is
AD9850, low pass filter is that RC filter circuits, i.e. lock-in amplifier include：Phase sensitive detector, signal generator and low pass filtered
Ripple device.
The task of phase-sensitive detector must can be inputted after completing the multiplying of input signal and reference signal, calculation process
Signal and reference signal and frequency, difference frequency signal.The purpose of low pass filter is to filter out the radio-frequency component in signal, and this just makes frequency
Band narrows, therefore has reached the purpose for extracting the small-signal in noise.
If sinusoidal signal to be measured is x1(t)=VASin (ω t+a), noise is n (t), and the first reference signal is y1(t)=
Bsin (ω t+b), the second reference signal y2(t)=Bsin (ω t+b-90 °), wherein, amplitude B is, it is known that a, b are represented respectively
The initial phase of sinusoidal signal to be measured and the first reference signal.In phase sensitive detection link, join sinusoidal signal to be measured and first
Examine signal and carry out multiplication operation, its result is as follows：
Section 1 is direct current signal in formula (5), and its numerical value is proportional to the range value of two signals and the cosine of phase difference；Second
The frequency-doubled signal that it is measured signal that item, which is,.Noise is input to multiplier with measured signal in the same time, also assists in reference to letter
Number be multiplied in.To in interpretation of result, it can be seen that n (t) B sin (ω t+b) almost all is AC signal.Low pass filter it is logical
Road can accomplish very narrow, during by low pass filter, filter two frequency-doubled signals and noise and reference signal of echo signal
Product signal, only direct current signal pass through, i.e.,Only it is to be understood that the initial phase a and b of two signals,
Then cos (a-b) is determined, and has the amplitude B of determination, then the amplitude V of measured signalAIt is readily available.
But be difficult in general, in single channel to make cos (a-b) constant, and be difficult to obtain.In order to avoid this brings
Influence, using 90 ° of reference signal travel(l)ing phase and make it as the reference signal (i.e. the second reference signal) on another road, such one
The detection of signal can be just done dynamically and calculate its amplitude and phase by carrying out the lock-in amplifier of orthogonal type.Shown in Fig. 6, it is
The schematic diagram of orthogonal type lock-in amplifier.Sinusoidal signal to be measured and the result of another road reference signal multiplication operation are：
The structure of orthogonal type lock-in amplifier is in certain symmetry, is made up of the signalling channel and correlator of two.Its
In, two signalling channels are identical, and the signalling channel output identical signal of two-way, and reference channel output two-way same frequency is just
String signal, phase differs 90 °, is separately input in two correlators (AD630) carry out computing.Two correlator output difference
For：
v1(t)=0.5VAB cos(a-b)
v2(t)=0.5VAB sin(a-b)
Quadratic sum is carried out by upper two formula, then opens radical sign processing (processing procedure specifically can be through vector/phase bit DSP processing)
It can obtain：
I.e.
From formula (8), v12It can be calculated by sampling, and v12In contain measured signal amplitude VAWith reference signal width
Value B information, because B is, it is known that measured signal amplitude can be tried to achieve；I.e. lock-in amplifier can detect letter to be measured well
Number range value VA, small-signal successfully detected.
I.e.：VA=Asin α
In other words, the signal with excited signal with frequency is extracted in obtained sinusoidal signal is amplified through signal amplification procedure
Sinusoidal magnitude value signal.
Cosine signal to be measured is similarly set as x2(t)=V 'ASin (ω t+a), the process handled cosine signal to be measured
Refer to the processing procedure of above-mentioned sinusoidal signal：
Cosine signal to be measured carries out multiplication operation with the first reference signal and the second reference signal respectively, obtains third phase and multiplies
Operation result and the 4th multiplication operation result, third phase multiplication result are as follows：
The 4th multiplication operation result is as follows：
It can be obtained after low-pass filtered device filtering：
v3(t)=0.5V 'ABcos(a-b)
v4(t)=0.5V 'ABsin(a-b)
Quadratic sum is carried out by upper two formula, then opens radical sign processing (processing procedure specifically can be through vector/phase bit DSP processing)
It can obtain：
I.e.
VA'=Acos α
In other words, the signal with excited signal with frequency is extracted in obtained cosine signal is amplified through signal amplification procedure
Cosine amplitude signal.
In, by formula (8), a and b phase difference are certain, have reached the purpose of locking phase, and reference signal initial phase
Position is, it is known that then measured signal phase can be tried to achieve.
(3) Part III：Decoding
Final step decoding is completed by digital control circuit, as shown in fig. 7, obtaining lock-in amplifier frequency-selecting by AD samplings
Signal after processing, i.e.,：
This obvious two paths of signals, which is divided by, has just obtained tan α, then can be obtained by by the method tabled look-up position angle α value.
To sum up, decoding process of the present utility model can be divided mainly into three parts：Signal amplification, lock mutually amplify and solved
Code.First part signal amplification, is amplified to volt level, it is desirable to putting by the other cosine and sine signal for being loaded with positional information of millivolt level
During big, the distortion of signal is preferably minimized.Part II lock mutually amplifies, the effect of lock-in amplifier here be by
The signal with frequency with excited signal is extracted in the cosine and sine signal of amplification, i.e., useful signal is filtered beyond magnet excitation frequency
Other garbage signals, the wave filter special equivalent to one.Part III, the sine and cosine width obtained after being handled according to first two steps
Value signal calculates position signalling by software built-in in digital control circuit.Test shows that the utility model has relatively low
Cost and higher flexibility, and the filtering of lock-in amplifier can guarantee that the precision of decoding.
As known by the technical knowledge, the utility model can be by the realities of other essence or essential feature without departing from its spirit
Scheme is applied to realize.Therefore, embodiment disclosed above, for each side, is all merely illustrative, and is not only
's.All changes in the range of the utility model or in the range of the utility model is equal to are by the utility model bag
Contain.
Claims (6)
1. a kind of inductosyn signal solution code system, it is characterised in that including：Digital control circuit, precise amplifying circuit and
Lock-in amplifier；
The digital control circuit is used to export excited signal so that the sine and cosine winding of inductosyn is in the excited signal
Coupling under, produce and be loaded with the cosine and sine signal of positional information；
The precise amplifying circuit is used for the amplitude amplification for the cosine and sine signal for being loaded with positional information for exporting inductosyn
To volt level；
The lock-in amplifier is connected with the precise amplifying circuit, for from the sine and cosine amplified through the signal amplification circuit
The sine and cosine amplitude signal with the signal of frequency with excited signal is accordingly extracted in signal, other beyond magnet excitation frequency are filtered
Garbage signal；
The digital control circuit is also connected with the lock-in amplifier, for the sine and cosine width exported to the lock-in amplifier
Value signal is decoded to obtain positional information.
2. inductosyn signal solution code system according to claim 1, it is characterised in that the precise amplifying circuit bag
Include：
Low-pass filter circuit, is connected with the inductosyn, is RC filter circuits；
Amplifying circuit, is connected with the RC filter circuits.
3. inductosyn signal solution code system according to claim 2, it is characterised in that the chip of the amplifying circuit
Model AD625.
4. inductosyn signal solution code system according to claim 1, it is characterised in that the lock-in amplifier is just
Friendship type lock-in amplifier.
5. inductosyn signal solution code system according to claim 1, it is characterised in that the digital control circuit is
Digital signal processing chip.
6. inductosyn signal solution code system according to claim 1, it is characterised in that the frequency of the excited signal
For 10Hz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643815A (en) * | 2016-12-28 | 2017-05-10 | 中国电子科技集团公司第二十研究所 | Signal decoding method and signal decoding system for inductive synchronizer |
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2016
- 2016-12-28 CN CN201621455609.9U patent/CN206369549U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643815A (en) * | 2016-12-28 | 2017-05-10 | 中国电子科技集团公司第二十研究所 | Signal decoding method and signal decoding system for inductive synchronizer |
| CN106643815B (en) * | 2016-12-28 | 2023-10-03 | 中国电子科技集团公司第二十一研究所 | Method and system for decoding signal of induction synchronizer |
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