CN106643815A - Signal decoding method and signal decoding system for inductive synchronizer - Google Patents
Signal decoding method and signal decoding system for inductive synchronizer Download PDFInfo
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- CN106643815A CN106643815A CN201611239193.1A CN201611239193A CN106643815A CN 106643815 A CN106643815 A CN 106643815A CN 201611239193 A CN201611239193 A CN 201611239193A CN 106643815 A CN106643815 A CN 106643815A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
Abstract
The invention provides a signal decoding method and a signal decoding system for an inductive synchronizer. The signal decoding method comprises the following steps of a coupling step, a signal amplifying step, a lock-phase amplifying step and a decoding step. The signal decoding system comprises the components of a digital control circuit which is used for outputting an exciting signal so that a sine/cosine winding of the inductive synchronizer generates a sine/cosine signal which carries position information through coupling of the exciting signal; a precise amplifying circuit which is used for amplifying the amplitude of the sine/cosine signal which is output from the inductive synchronizer and carries the position information; and a lock-phase amplifier which is connected with the precise amplifying circuit and is used for extracting a signal with frequency same with that of the exciting signal from the sine/cosine signal that is amplified by the signal amplifying circuit and filtering other useless signals except for the exciting frequency. The digital control circuit is further connected with the lock-phase amplifier and is used for decoding the signal which is output from the lock-phase amplifier for obtaining the position information. The signal decoding method and the signal decoding system have relatively low cost and relatively high flexibility, and furthermore filtering of the lock-phase amplifier can ensure high decoding precision.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of inductosyn signal decoding method and system.
Background technology
In fields such as military, industry, daily life and Aero-Space, the application of inductosyn is increasingly subject to weight
Depending on inductosyn is the displacement transducer that angle or linear displacement signal are transformed to alternating voltage, also known as plane formula rotation
Transformation depressor.From in principle, its (referred to as rotation becomes) and unsubstantial difference with rotary transformer, but become difference with rotation
It is that its stator is not mounted within the winding in the iron core slot of cylindrical shape and cylinder with rotor, and is analogous to print 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
Be 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, it 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, increased decoding
Difficulty, especially in the use occasion for needing high precision position signal.
The content of the invention
It is an object of the invention to provide a kind of inductosyn signal decoding method and system, with solve to decode difficulty compared with
Big problem.
In order to solve the above problems, the present invention provides following technical scheme：
A kind of inductosyn signal decoding method, it is comprised the following steps：Coupling step, makes the just remaining of inductosyn
Under the coupling of an excited signal, generation is loaded with the cosine and sine signal of positional information to chorded winding；Signal amplification procedure, by coupling step
Suddenly what is obtained be loaded with the amplitude of the cosine and sine signal of positional information is amplified to volt level；Lock phase amplification procedure, puts in signal described in Jing
Big step amplifies the signal sine and cosine amplitude signal accordingly extracted in the cosine and sine signal for obtaining with excited signal with frequency, filter
Fall the garbage signal beyond magnet excitation frequency；Decoding step, according to the sine and cosine amplitude signal for obtaining, calculates and is loaded with positional information
Position signalling.
In inductosyn signal decoding method as above, it is preferable that in coupling step, excited signal UmIt is full
Sufficient formula (1), formula (1) is：UmWherein, ω represents the angular frequency of excited signal to=A ' sin ω t；Inductosyn is exported
Cosine and sine signal Usin、UcosMeet formula (2), formula (2) is：Wherein, Usin、
UcosIn α be position angle signal, for representing positional information；In signal amplification procedure, the cosine and sine signal obtained after amplification
Meet formula (3), formula (3) is：Wherein, it is position angle α is false
It is set to invariant.
In inductosyn signal decoding method as above, it is preferable that in lock phase amplification procedure, filter excitatory
The filter circuit of the garbage signal beyond frequency is low-pass filter circuit.
In inductosyn signal decoding method as above, it is preferable that lock phase amplification procedure in, if it is to be measured just
String signal is x1(t)=VASin (ω t+a), cosine signal to be measured is x2(t)=V'ASin (ω t+a), noise be n (t), first
Reference signal is y1T ()=Bsin (ω t+b), the second reference signal is y2(t)=Bsin (ω t+b-90 °)；Wherein, width
Value B is known quantity, and a, b represent respectively the initial phase of sinusoidal signal to be measured and the first reference signal；Make sinusoidal signal to be measured point
Multiplication operation is not carried out with first reference signal and second reference signal, obtain the first multiplication operation result and second
Multiplication operation result, the first multiplication operation result meets formula (4), and formula (4) is：
Described second
Multiplication operation result meets formula (5), and formula (5) is：
To described
One multiplication operation result and the second multiplication operation result are filtered respectively process, and correspondence is obtained：
Make cosine signal to be measured respectively with first reference signal and described
Second reference signal carries out multiplication operation, obtains third phase multiplication result and is multiplied with the 4th operation result, and the third phase is taken advantage of
Operation result meets formula (6), and formula (6) is：
Described 4th
Multiplication operation result meets formula (7), and formula (7) is：
To described
Three multiplication operation results and the 4th multiplication operation result are filtered respectively process, and correspondence is obtained：
To v1(t) and v2T () carries out quadratic sum, and open what radical sign process was obtained
As a result formula (8) is met, formula (8) is：
To v3(t) and v4T () carries out quadratic sum, and open radical sign and process the result for obtaining and meet formula (9), and formula (9) is：
In inductosyn signal decoding method as above, it is preferable that in decoding step, sampled by AD
Signal v after processing to lock phase amplification procedure12、v34, to v12And v34Carry out being divided by and process the result for obtaining and meet formula
(10), formula (10) is：Tan α=v12/v34Arctangent cp cp operation is carried out to tan α, α is obtained.
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, generation is loaded with the cosine and sine signal of positional information；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；Lock-in amplifier, is connected with the precise amplifying circuit, is used for
Accordingly extract with excited signal with the just remaining of the signal of frequency in the cosine and sine signal amplified from signal amplification circuit described in Jing
String amplitude signal, filters other garbage signals beyond magnet excitation frequency；The digital control circuit also with the lock-in amplifier
Connection, for being decoded to obtain positional information to the sine and cosine amplitude signal that the lock-in amplifier is exported.
In inductosyn signal solution code system as 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 above, it is preferable that the lock-in amplifier is orthogonal type lock
Phase amplifier.
In inductosyn signal solution code system as above, it is preferable that the digital control circuit is numeral letter
Number process chip.
Analysis understands that the present invention proposes one kind using DSP as control main control unit, with reference to accurate operational amplification circuit and lock
Phase amplifier carries out the high accuracy of corresponding signal process and resolves scheme.The scheme of hardware decoding after amplifying with general direct signal
Compare, the present invention has relatively low cost and higher flexibility, and the filtering of lock-in amplifier can guarantee that the precision of decoding.
Description of the drawings
Fig. 1 is the general frame of the embodiment of the present invention；
Fig. 2 is the signal amplification process schematic diagram of the embodiment of the present invention；
Fig. 3 is the lock phase amplification process schematic diagram of the embodiment of the present invention；
Fig. 4 is the lock-in amplifier signal processing flow figure of the embodiment of the present invention；
Fig. 5 is the sinusoidal signal lock-in amplifier schematic diagram of the embodiment of the present invention；
Fig. 6 is the orthogonal type lock-in amplifier schematic diagram of the embodiment of the present invention；
Fig. 7 is the decoding schematic diagram of the embodiment of the present invention；
There is circuit for the excited signal of the embodiment of the present invention in Fig. 8；
Fig. 9 is the high-precision amplification circuit of the embodiment of the present invention；
Figure 10 is the signal generating circuit of the embodiment of the present invention；
Figure 11 is the lock-in amplifier of the embodiment of the present invention.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description.
For the principle of the present invention, the operation decoded to inductosyn can be divided into three steps：Signal amplifies
Step, lock phase amplification procedure and decoding step.For inductosyn output signal it is weak the characteristics of, be amplified respectively, filter
Ripple and decoding process.Especially in filtering link, CF small-signal can be extracted in noise using lock-in amplifier
Feature, is effectively filtered to measured signal, and the application of orthogonal type lock-in amplifier can avoid the problem that phase place is brought.
Based on this, such as Fig. 1, in the system that the present invention is provided, hardware component mainly includes three big modules：Digital control electricity
Road, precise amplifying circuit, lock-in amplifier.Wherein, in digital control circuit, with DSP (Digital Signal
Processing, digital signal processor) used as regulation and control master unit, the such as digit chip of model TMS320X2812, it includes
The minimum system being made up of components and parts such as crystal oscillators, there is provided make 3.3V and 1.8V voltages, certain frequency that TMS320X2812 works
Clock signal.Level shifting circuit 74ACT245, by the PWM waveform of DSP output amplitude 3.3V the PWM waveform letter of 5V is converted into
Number, improve chip drives ability.The high accuracy external sampling chip ADS7864 of sampling module, can in real time take outside mould
Intend signal, be converted to after data signal and again DSP process to be sent to by data/address bus.Emulation programming mouth circuit JTAG, can realize
The program burn writing of chip and online procedure simulation, improve development ability.And 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 of excited signal output.
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 are constituted.The circuit connection diagram of amplifier AD625 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 output after amplifying,
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 advanced CMOS technology of the synthesizer application, it is possible to use DSP pins are controlled to it
System.As shown in Figure 10, LPF is low-pass filter circuit to the circuit connection diagram of signal generator chip AD9850 in figure.Chip
AD630, Inner Constitution includes two operational amplifier As and B, switching switch, comparator COMP (T containing triode), output integration
Resistance in compensating electric capacity, piece in amplifier, piece.Its advantages, when lock-in amplifier is designed, AD630 is used as phase sensitive detection
Using, i.e. multiplier is completing the design of correlation detecting circuit for device.
It will be appreciated by those skilled in the art that although foregoing description is related to chip type, the present invention not as
Limit.
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 due to Usin、UcosSignal is only
There are mV levels, and be particularly easy to by noise jamming, so needing through special process, that is, to be provided with following process and walk
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 levels by mV ranks), keeps in the process signal interference-free as far as possible, but main purpose is to amplify.The letter
Number method and step can be processed 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 claiming pre-amplification circuit) uses the instrument with high accuracy and high cmrr
Amplifier AD625, and design its peripheral circuit, from high-precision configuration resistance, can easily and flexibly select to amplify times
Number.
The signal obtained after amplification is：
Due to, position angle α it is relative compared with the change of magnet excitation frequency (10kHz) slowly, can in signal processing
Invariant is assumed to be, therefore the signal after amplifying is 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 process.Inspection of the prior art
Survey method is mostly using bandpass filter as means of filtering, but the method has drawback, needs the very narrow of bandwidth Design, right
It is designed with very high requirement, and is easily affected by temperature, voltage.Therefore, in the present invention is implemented, by using lock phase
Amplifier accordingly extracts the signal with excited signal with frequency in Jing signals amplification procedure amplifies the cosine and sine signal for obtaining
The sine and cosine amplitude signal of (i.e. useful signal), filters the garbage signal beyond magnet excitation frequency, in particular by carrying out to signal
Lock mutually amplifies, filtering is obtained.The processing procedure that lock mutually amplifies is as shown in Figure 3.Lock-in amplifier is based on cross-correlation test principle
Design, its core is phase sensitive detection, relevant principle is repeated no more.The signal processing of lock-in amplifier such as Fig. 4
It is shown, need reference signal all the way, 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
As a example by string signal, cosine signal is by that analogy.For AD630, signal generator is the phase sensitive detector that side circuit is adopted
AD9850, low pass filter includes for RC filter circuits, i.e. lock-in amplifier：Phase sensitive detector, signal generator and low pass filtered
Ripple device.
The task of phase-sensitive detector is to complete the multiplying of input signal and reference signal, can be input into after calculation process
Signal and reference signal and frequently, difference frequency signal.The purpose of low pass filter is to filter 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, sinusoidal signal to be measured and the first ginseng are made
Examining signal carries out multiplication operation, and 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
For be measured signal frequency-doubled signal.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 initial phase a and b of two signals,
Then cos (a-b) determines, and has amplitude B of determination, then amplitude V of measured signalAIt is readily available.
But in general, it is difficult to make cos (a-b) constant in single channel, and is difficult to obtain.In order to avoid this brings
Impact, 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
Carrying out the lock-in amplifier of orthogonal type can just be done dynamically the detection of signal and calculate its amplitude and phase place.Shown in Fig. 6, it is
The schematic diagram of orthogonal type lock-in amplifier.Sinusoidal signal to be measured is with the result of another road reference signal multiplication operation：
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 identical signal of signalling channel output two-way, and reference channel output two-way same frequency is just
String signal, 90 ° of phase is separately input to carry out computing in two correlators (AD630).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 to process (processing procedure specifically can Jing vectors/phase bit DSP process)
Can obtain：
I.e.
From formula (8), v12Can be calculated by sampling, and v12In contain measured signal amplitude VAWith reference signal width
The information of value B, because B is, it is known that measured signal amplitude can be tried to achieve；I.e. lock-in amplifier can well detect letter to be measured
Number range value VA, small-signal successfully detected.
I.e.：VA=Asin α
In other words, the signal extracted in the sinusoidal signal for obtaining with excited signal with frequency is amplified in Jing signals amplification procedure
Sinusoidal magnitude value signal.
Cosine signal to be measured is set in the same manner as x2(t)=V'ASin (ω t+a), the process that cosine signal to be measured is processed
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 takes advantage of
Operation result and the 4th multiplication operation result, third phase multiplication result is as follows：
The 4th multiplication operation result is as follows：
Can obtain 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 to process (processing procedure specifically can Jing vectors/phase bit DSP process)
Can obtain：
I.e.
VA'=Acos α
In other words, the signal extracted in the cosine signal for obtaining with excited signal with frequency is amplified in Jing signals amplification procedure
Cosine amplitude signal.
Using in, by formula (8), the phase difference of a and b is certain, has reached the purpose of locking phase, and reference signal initial phase
Position is, it is known that then measured signal phase place 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 process, i.e.,：
Obviously this two paths of signals is divided by the tan α that just obtained, then can be obtained by the value of position angle α by the method tabled look-up.
To sum up, decoding process of the invention can be divided mainly into three parts：Signal amplifies, lock mutually amplifies and decodes.The
One part signal amplifies, and the other cosine and sine signal for being loaded with positional information of millivolt level is amplified into volt level, it is desirable to amplified
Cheng Zhong, the distortion of signal is preferably minimized.Part II lock mutually amplifies, and the effect of lock-in amplifier here is exaggerated
Cosine and sine signal in extract signal with excited signal with frequency, i.e., useful signal, filter beyond magnet excitation frequency other
Garbage signal, the wave filter special equivalent to.Part III, according to the sine and cosine amplitude letter obtained after first two steps process
Number position signalling is calculated by software built-in in digital control circuit.Test shows, the present invention have relatively low cost with
Higher flexibility, and the filtering of lock-in amplifier can guarantee that the precision of decoding.
As known by the technical knowledge, the present invention can be by other essence without departing from its spirit or the embodiment party of essential feature
Case is realizing.Therefore, embodiment disclosed above, for each side, is all merely illustrative, and is not only.Institute
Have and be included in the invention within the scope of the present invention or in the change being equal in the scope of the present invention.
Claims (9)
1. a kind of inductosyn signal decoding method, it is characterised in that comprise the following steps：
Coupling step, makes the sine and cosine winding of inductosyn under the coupling of an excited signal, and generation is loaded with positional information
Cosine and sine signal；
Signal amplification procedure, the amplitude of the cosine and sine signal for being loaded with positional information that coupling step is obtained is amplified to volt level；
Lock phase amplification procedure, accordingly extract in signal amplification procedure described in Jing amplifies the cosine and sine signal that obtains with it is excitatory
Signal filters the garbage signal beyond magnet excitation frequency with the sine and cosine amplitude signal of the signal of frequency；
Decoding step, according to the sine and cosine amplitude signal for obtaining, calculates the position signalling for being loaded with positional information.
2. inductosyn signal decoding method according to claim 1, it is characterised in that excitatory in coupling step
Signal UmMeet formula (1), formula (1) is：
Um=A ' sin ω t
Wherein, ω represents the angular frequency of excited signal；
The cosine and sine signal U of inductosyn outputsin、UcosMeet formula (2), formula (2) is：
Wherein, Usin、UcosIn α be position angle signal, for representing positional information；
In signal amplification procedure, the cosine and sine signal obtained after amplification meets formula (3), and formula (3) is：
Wherein, position angle α is assumed to be into invariant.
3. inductosyn signal decoding method according to claim 2, it is characterised in that in lock phase amplification procedure,
The filter circuit for filtering the garbage signal beyond magnet excitation frequency is low-pass filter circuit.
4. inductosyn signal decoding method according to claim 2, it is characterised in that in lock phase amplification procedure,
If sinusoidal signal to be measured is x1(t)=VASin (ω t+a), cosine signal to be measured is x2(t)=V'A Sin (ω t+a), noise is
N (t), the first reference signal is y1T ()=Bsin (ω t+b), the second reference signal is y2(t)=Bsin (ω t+b-
90°)；Wherein, amplitude B is known quantity, and a, b represent respectively the initial phase of sinusoidal signal to be measured and the first reference signal；
Make sinusoidal signal to be measured carry out multiplication operation with first reference signal and second reference signal respectively, obtain
One multiplication operation result is multiplied operation result with second, and the first multiplication operation result meets formula (4), and formula (4) is：
The second multiplication operation result meets formula (5), and formula (5) is：
It is filtered process respectively to the first multiplication operation result and the second multiplication operation result, correspondence is obtained：
v1(t)=0.5VAB cos(a-b)
v2(t)=0.5VAB sin(a-b)
Make cosine signal to be measured carry out multiplication operation with first reference signal and second reference signal respectively, obtain
Three multiplication operation results are multiplied operation result with the 4th, and the third phase multiplication result meets formula (6), and formula (6) is：
The 4th multiplication operation result meets formula (7), and formula (7) is：
It is filtered process respectively to the third phase multiplication result and the 4th multiplication operation result, correspondence is obtained：
v3(t)=0.5V'ABcos(a-b)
v4(t)=0.5V'ABsin(a-b)
To v1(t) and v2T () carries out quadratic sum, and open radical sign and process the result for obtaining and meet formula (8), and formula (8) is：
To v3(t) and v4T () carries out quadratic sum, and open radical sign and process the result for obtaining and meet formula (9), and formula (9) is：
5. inductosyn signal decoding method according to claim 4, it is characterised in that in decoding step,
Obtain locking the signal v after phase amplification procedure is processed by AD samplings12、v34, to v12And v34Carry out being divided by and process what is obtained
As a result formula (10) is met, formula (10) is：
Tan α=v12/v34
Arctangent cp cp operation is carried out to tan α, α is obtained.
6. a kind of inductosyn signal solution code system, it is characterised in that include：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, generation is loaded with the cosine and sine signal of positional information；
The precise amplifying circuit is used for the amplitude of the cosine and sine signal for being loaded with positional information for exporting inductosyn and amplifies
To volt level；
The lock-in amplifier is connected with the precise amplifying circuit, for the sine and cosine amplified from signal amplification circuit described in Jing
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.
7. inductosyn signal solution code system according to claim 6, 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.
8. inductosyn signal solution code system according to claim 6, it is characterised in that the lock-in amplifier is for just
Friendship type lock-in amplifier.
9. inductosyn signal solution code system according to claim 6, it is characterised in that the digital control circuit is
Digital signal processing chip.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107884838A (en) * | 2017-10-18 | 2018-04-06 | 哈尔滨工程大学 | A kind of magnetic electric compound material base magnetic field sensor with sensitivity |
| CN109617464A (en) * | 2019-01-14 | 2019-04-12 | 北京机械设备研究所 | A kind of rotary transformer coding/decoding method and system based on pwm signal excitation |
| CN110530249A (en) * | 2019-08-30 | 2019-12-03 | 无锡市海鹰工程装备有限公司 | A kind of preamplifier and its inductosyn of inductosyn |
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