CN109541272A - It is a kind of based on transformer coupled analog signal isolating method and isolation circuit - Google Patents
It is a kind of based on transformer coupled analog signal isolating method and isolation circuit Download PDFInfo
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Abstract
The invention discloses a kind of based on transformer coupled analog signal isolating method and isolation circuit, it is using analog signal as modulated signal, the square-wave signal of higher-frequency is as carrier signal, using high frequency transformer as analog multiplier, analog signal and square-wave signal are subjected to time domain product by analog multiplier and obtain amplitude-modulated wave, carries out low-pass filtering again after recycling synchronous demodulation method to demodulate amplitude-modulated wave to restore original analog signal.The present invention can equally play the role of the propagation path of interference blocker signal using transformer coupled isolation, have the shortcomings that temperature stability is poor different from photoelectric coupling analog signal isolating circuit, transformer coupled analog signal isolating circuit has preferable temperature stability, the modulation and demodulation of binding signal, using transformer as the analog multiplier in time domain, the isolation of analog signal can be realized more conveniently.
Description
Technical field
The present invention relates to analog signal isolatings to convert application field, specifically a kind of based on transformer coupled analog signal
Partition method and isolation circuit.
Background technique
In many applications, especially with the site of deployment of strong interferers, the mould of analog signal especially low frequency
Quasi- signal is easy the interference by other interference signals such as electromagnetic signal, high-frequency digital signal etc., exists so as to cause analog signal
It is often superimposed useless all kinds of interference signals during transmission, causes signal-to-noise ratio not high, influences detection system and simulation is believed
Number acquisition precision so that the overall accuracy of analog signal detection system declines.Under normal conditions, pass through cutting interference signal
Propagation path and by the analog signal of rather low-frequency be pushed into high frequency region be remove interference signal and improve signal-to-noise ratio effective ways.
Currently, commonly the method for removal interference signal have it is following several: 1) merely using frequency-selective network, by useful signal and dry
Disturb the filter circuits such as the spectrum analysis design band logical of signal, band resistance, low pass and high pass, but the practicality is interfered the frequency of signal
The limitation of rate ingredient multiplicity, effect are limited；2) analog signal is isolated using photoelectric coupling analog isolation circuit, this method
At present using relatively broad, but its temperature stability is relatively poor；3) it uses microcontroller for core, first analog signal is carried out
Digital photoelectric isolation, this kind of partition method applied field little in some interference strengths are carried out to digital quantity again after analog-to-digital conversion
Conjunction has certain effect, but under stronger interference environment, in analog-digital conversion process, the analog signal pole converted has can
Can be superimposed substantial portion of interference signal, there is certain for digital quantity and useful analog signal after causing conversion
Distortion；4) expensive integrated simulation signal isolation chip is used, isolation effect is preferable, but at high cost, to constrain
Its application prospect.
Summary of the invention
The technical problem to be solved in the present invention is to provide it is a kind of based on transformer coupled analog signal isolating method and every
From circuit, compared to the method that analog signal is isolated in photoelectric coupling, transformer coupled isolation can equally play blocking
The effect of the propagation path of interference signal, transformer coupled analog signal isolating circuit have preferable temperature stability, can be with
The isolation of analog signal is realized more conveniently.
The technical solution of the present invention is as follows:
It is a kind of based on transformer coupled analog signal isolating method, using analog signal as modulated signal, higher-frequency
Square-wave signal is as carrier signal, and using high frequency transformer as analog multiplier, analog signal and square-wave signal are passed through mould
Quasi-multiplication device carries out time domain product and obtains amplitude-modulated wave, carries out low pass again after recycling synchronous demodulation method to demodulate amplitude-modulated wave
Filtering is to restore original analog signal.
It is a kind of based on transformer coupled analog signal isolating method, first unipolarity of the analog signal after amplitude transformation
Signal and square wave carrier signal, which enter, to be modulated to obtain amplitude-modulated wave in modulator；Amplitude-modulated wave recycles demodulator to synchronize solution
It adjusts, the low-pass filtered circuit of amplitude-modulated wave after synchronous demodulation is filtered, and is left low frequency similar with original analog frequency spectrum
Signal, finally low frequency signal similar with original analog frequency spectrum restores original analog signal by amplitude transformation.
It is a kind of based on transformer coupled analog signal isolating circuit, include amplitude converting circuit, modulation and synchronous solution
Adjust filter circuit and amplitude inverse transform circuit；
The amplitude converting circuit includes sensor interface JP1, zero-bit adjusting circuit, instrumentation amplifier U1, precision
Operational amplifier U2, potentiometer RG and several capacitors and resistance, the zero-bit adjust circuit connection in sensor interface JP1's
On IN+ pin, the IN+ pin of sensor interface JP1 is connect with the non-inverting input terminal of instrumentation amplifier U1, sensor interface JP1
GND pin connect with the inverting input terminal of instrumentation amplifier U1, the output end and precision operational-amplifier of instrumentation amplifier U1
The non-inverting input terminal of U2 connects, and the inverting input terminal of precision operational-amplifier U2 is grounded by potentiometer RG, accurate operation amplifier
Output end output amplitude transformed unipolar signal Vin1 of the output end of device U2 as amplitude converting circuit；
The modulation and synchronous demodulation filter circuit include reverse protection diode D1, self-recovery fuse F1, just
Grade low-pass filter circuit, resistance R20, resistance R22, capacitor C11, capacitor C12, NPN triode Q4, NPN triode Q5, high frequency become
Depressor T1, diode D5, field-effect tube Q6, high frequency transformer T2, diode D10, field-effect tube Q7 and two-stage low-pass wave electricity
The anode on road, the reverse protection diode D1 is connect with 24V DC power supply, reverse protection diode D1 it is positive with from extensive
One end of double insurance silk F1 connects, and the other end of self-recovery fuse F1 is connect with the input terminal of preliminary low-pass wave circuit, electricity
Hinder one end of R20, one end of resistance R22 connect with the output end of preliminary low-pass wave circuit, the other end of resistance R20 and
The base stage of NPN triode Q4 connects, and the other end of resistance R22 is connect with the base stage of NPN triode Q5, the collection of NPN triode Q4
Electrode is connect by capacitor C11 with the base stage of NPN triode Q5, and the collector of NPN triode Q5 passes through capacitor C12 and NPN tri-
The base stage of pole pipe Q4 connects, and the emitter of NPN triode Q4 and the emitter of NPN triode Q5 are grounded, NPN triode Q4's
Collector is connect with one end of high frequency transformer T1 primary coil, and the collector and high frequency transformer T1 of NPN triode Q5 is primary
The other end of coil connects, and the T1 primary coil of preliminary low-pass wave circuit output end and high frequency transformer is connected to excitation electricity
Source, the secondary generation mutually isolated and independent Symmetrical power supply in three tunnels of high frequency transformer T1, the first of high frequency transformer T1
Road secondary forms 8V Symmetrical power supply, and high frequency transformer T1 the second tunnel secondary forms 14V Symmetrical power supply, and the first via time
The anode of grade is connect with the cathode of diode D5, and the anode of diode D5 is connect with the grid of field-effect tube Q6, field-effect tube Q6
Source electrode connect with the cathode of first via secondary, the drain electrode of field-effect tube Q6 is connect with one end of high frequency transformer T2, high frequency become
The other end of depressor T2 and the output end of amplitude converting circuit connect, and one end of T2 grade of high frequency transformer is with field-effect tube Q7's
Drain electrode connection, the source electrode ground connection of field-effect tube Q7, the grid of field-effect tube Q7 are connect with the cathode of diode D10, diode D10
Positive connection+14V power supply, two-stage low-pass wave circuit is by resistance R12, capacitor C22, capacitor C23, resistance R26 and capacitor
C28 composition, one end of capacitor C28 are connect with one end of T2 grade of high frequency transformer, and one end other end of capacitor C28 passes through resistance
R26 is connect with the other end of T2 grade of high frequency transformer, one end of resistance R12, capacitor C22 one end with high frequency transformer T2
Secondary other end connection, the other end of resistance R12 and one end of capacitor C23 are connected to filtering voltage output end, capacitor C22
The other end and capacitor C23 the other end ground connection；
The amplitude inverse transform circuit selects voltage magnitude inverse transform circuit or current amplitude inverse transform circuit；Voltage amplitude
Value inverse transform circuit include operational amplifier U3, socket P1, socket P2, resistance R7, resistance R24, capacitor C21, resistance R18,
Resistance R15, diode D1, capacitor C17, capacitor C18 and resistance R14, the socket P1 pin 3 be filtering voltage input
End, pin 1 are ground terminal, and the pin 1 of the socket P1 is filtering voltage input terminal, pin 3 is ground terminal, the socket
The pin 2 and 3 of P1 is shorted, the pin 2 and 3 of socket P2, and the pin 2 of socket P1 passes through the same phase of resistance R7 and operational amplifier U3
Input terminal connection, socket P2 be shorted after pin 2 by the inverting input terminal of resistance R24 and operational amplifier U3, capacitor C21 with
One end connect with the inverting input terminal of operational amplifier U3, is after capacitor C21 and resistance R18 parallel connection another after resistance R18 is in parallel
End, the positive of the output end of operational amplifier U3, diode D1 connect with one end of resistance R15, and the cathode of diode D1 connects
+ 14V power supply is connect, one end of resistance R14, one end of capacitor C17 are connect with the other end of resistance R15, the other end of resistance R14
Normal voltage pick-up signal output end is connected to one end of capacitor C18, the other end of the other end of capacitor C17, capacitor C18
It is grounded；
The current amplitude inverse transform circuit includes operational amplifier U3, socket P1, socket P2, socket P3, resistance
R7, resistance R24, capacitor C21, resistance R18, resistance R15, diode D1, capacitor C17, capacitor C18, resistance R8, resistance R25, electricity
The pin 3 for hindering R17, diode D2, PNP triode Q1, PNP triode Q2 and NPN triode Q3, the socket P1 is filtering
Voltage input end, pin 1 are ground terminal, and the pin 1 of the socket P1 is filtering voltage input terminal, pin 3 is ground terminal, institute
The pin 2 and 1 of the socket P1 stated is shorted, the pin 2 and 1 of socket P2, and the pin 2 of socket P1 passes through resistance R7 and operational amplifier
The non-inverting input terminal of U3 connects, and the pin 2 of socket P2 passes through the inverting input terminal of resistance R24 and operational amplifier U3, capacitor C21
One end after in parallel with resistance R18 is connect with the inverting input terminal of operational amplifier U3, after capacitor C21 and resistance R18 parallel connection
The other end, PNP triode Q2 emitter connect with the pin 2 of socket P3, output end, the diode D1 of operational amplifier U3
Anode, socket P3 pin 1 connect with one end of resistance R15, the cathode connection+14V power supply of diode D1, capacitor C17
One end, one end of capacitor C18, the base stage of PNP triode Q1, the collector of PNP triode Q2, diode D2 cathode, electricity
The other end of resistance R15 is connected to electric current pick-up signal output end, and the other end of capacitor C17 and the other end of capacitor C18 connect
The one end on ground, resistance R8 is connect with the non-inverting input terminal of operational amplifier U3, and the other end of resistance R8 is connect with+14V power supply, electricity
One end of resistance R25 is connect with+14V power supply, and one end of resistance R17 is connect with+14V power supply, and the other end of resistance R25 is and PNP
The emitter of triode Q2 connects, and the other end of resistance R17, the base stage of PNP triode Q2, the emitter of PNP triode Q1 are equal
It is connect with the collector of NPN triode Q3, the collector of PNP triode Q1 is connect with the base stage of NPN triode Q3, tri- pole NPN
The collector of pipe Q3 is connect with the anode of diode D2.
The zero-bit adjusts circuit and is made of potentiometer RZ and resistance R4, resistance R1 and resistance R2, and the one of resistance R4
End ground connection, a fixing end of the other end connection potentiometer RZ of resistance R4, another fixing end of potentiometer RZ and the one of resistance R2
End connection, the other end of resistance R2 connect regulated power supply E+, and the adjustable end of potentiometer RZ passes through resistance R4 and sensor interface JP1
IN+ pin connection.
The first via secondary of the high frequency transformer T1 passes through diode D3, diode D4, electrolytic capacitor E1, electrolysis electricity
The circuit for holding E2, capacitor C9 and capacitor C10 composition forms 8V Symmetrical power supply, and the cathode of diode D3, diode D4 are just
It is extremely connect with one end of first via secondary, the anode of diode D3, the cathode of electrolytic capacitor E1 are connected with one end of capacitor C9
As -8V power output end, one end of the cathode of diode D4, the anode of electrolytic capacitor E2 and capacitor C10 is connected to+8V electricity
Source output terminal, the other end company of the anode of electrolytic capacitor E1, the cathode of electrolytic capacitor E2, the other end of capacitor C9 and capacitor C10
It connects as ground terminal GND；The cathode power supply input terminal of the instrumentation amplifier U1 and precision operational-amplifier U2 are electric with+8V
The positive and negative power supply input terminal of source output terminal connection, instrumentation amplifier U1 and precision operational-amplifier U2 are exported with -8V power supply
End connection.
The second tunnel secondary of the high frequency transformer T1 passes through diode D7, diode D9, electrolytic capacitor E4, electrolysis electricity
The circuit for holding E6, capacitor C14 and capacitor C16 composition forms 14V Symmetrical power supply, the anode of diode D7, diode D9
Cathode is connect with one end of first via secondary, and one end of the cathode of diode D7, the anode of electrolytic capacitor E4 and capacitor C14 connects
The cathode of the anode, electrolytic capacitor E6 that meet conduct+14V power output end+14V1, diode D9 is connected with one end of capacitor C16
As -14V power output end -14V1, the cathode of electrolytic capacitor E4, the anode of electrolytic capacitor E6, capacitor C14 the other end and electricity
The other end for holding C16 is connected to ground terminal GND1；+ 14V power output end+14V1 exports regulated power supply by voltage stabilizing chip U4
The second tunnel secondary of E+, transformer T1 are coupled with the auxiliary primary windings of transformer T1, and the auxiliary primary windings of transformer T1 are logical
The circuit for crossing diode D6, diode D8, electrolytic capacitor E3, electrolytic capacitor E5, capacitor C13 and capacitor C15 composition is forming 14V just
Negative symmetric power, the anode of diode D6, the cathode of diode D8 are connect with one end of transformer T1 auxiliary primary windings, and two
One end of the cathode of pole pipe D6, the anode of electrolytic capacitor E3 and capacitor C13 is connected to+14V power output end+14V2, two poles
One end of the anode of pipe D8, the cathode of electrolytic capacitor E5 and capacitor C15 is connected to -14V power output end -14V2, electrolysis electricity
The other end for holding the cathode of E3, the anode of electrolytic capacitor E5, the other end of capacitor C13 and capacitor C15 is connected to ground terminal
GND2；The cathode power supply input terminal of the operational amplifier U3 of voltage magnitude inverse transform circuit or current amplitude inverse transform circuit with
+ 14V power output end+14V2 connection, the operational amplifier U3 of voltage magnitude inverse transform circuit or current amplitude inverse transform circuit
Negative power supply input terminal connect with -14V power output end -14V2.
The principle of the present invention:
Carrier signal of the invention uses the reason of square wave rather than monochromatic wave are as modulated signal are as follows: in actual application
In circuit, square-wave signal is easy to get and load capacity is strong, and by the spectrum analysis of square-wave signal it is found that square-wave signal is practical
On be to be formed by stacking by the single harmonic signal of infinite more frequency, due to square-wave signal centre frequency be equal to multiple-harmonic base
Therefore wave frequency rate need to only determine that the centre frequency of square-wave signal is much higher than the frequency of analog signal, so that it may easily determine
The cutoff frequency of last low-pass filter circuit, to finally restore original analog signal.
If analog signal is x (t), highest frequency fm, P (t) is square wave carrier signal, centre frequency fo, fo>>
fm, transformer isolation process such as Fig. 1 of analog signal.
Modulator therein interlock circuit in conjunction with the demodulator respectively isolating transformer by high frequency is realized, according to Fourier
The correlation theory of sum of series Fourier transformation, the process of the available transformer analog signal isolation based on square wave carrier signal
Frequency spectrum is as follows:
If analog signal after amplitude transformation x ' (t) amplitude-frequency spectrum X ' (f) be Fig. 2, amplitude be 1 square wave carrier signal and
The bilateral amplitude-frequency spectrum of the harmonic component of synchronous square wave demodulated signal is Fig. 3.
After modulation and synchronous demodulation, X ' (f) and each harmonic component convolution knot of periodic square wave can be obtained according to the property of δ function
The amplitude-frequency spectrum of fruit is Fig. 4 and Fig. 5.
Enable Xm" (f) be xm" (t) Fourier transformation, amplitude-frequency spectrum be Fig. 6.
Comparison diagram 1 and Fig. 6 are it is found that Xm" (f) amplitude-frequency is composed and the amplitude-frequency of original signal spectrum X ' (f) essential difference is original
The difference of amplitude in effective frequency range of analog signal, while Xm" (f) there is also other signals of high frequency, high frequency section signals
It can be filtered out by low-pass filtering, only be left low frequency signal similar with original analog frequency spectrum after filtering, can pass through
Amplitude transformation restores original analog signal.
Advantages of the present invention:
Compared to the method that analog signal is isolated in photoelectric coupling, the present invention equally may be used using transformer coupled isolation
To play the role of the propagation path of interference blocker signal, it is different from photoelectric coupling analog signal isolating circuit and stablizes with temperature
Property poor disadvantage, transformer coupled analog signal isolating circuit has a preferable temperature stability, the modulation of binding signal with
Demodulation, using transformer as the analog multiplier in time domain, can realize the isolation of analog signal more conveniently.
Detailed description of the invention
Fig. 1 is the flow chart of analog signal isolating method of the present invention.
Fig. 2 is the amplitude-frequency spectrogram of x ' (t) in Fig. 1.
Fig. 3 is the bilateral width of the square wave carrier signal P (t) that amplitude is 1 and synchronous square wave demodulated signal P ' (t) harmonic component
Spectrogram.
Fig. 4 is the amplitude-frequency spectrogram of amplitude-frequency spectrum X ' (f) convolution results of x ' (t) in Fig. 1.
Fig. 5 is the amplitude-frequency spectrogram of each harmonic component convolution results of periodic square wave.
Fig. 6 is x in Fig. 1m" (t) Fourier transformation amplitude-frequency spectrogram.
Fig. 7 is the circuit diagram of amplitude converting circuit of the present invention.
Fig. 8 is the circuit diagram of present invention modulation and synchronous demodulation filter circuit.
Fig. 9 is the circuit diagram of voltage magnitude inverse transform circuit of the present invention.
Figure 10 is the circuit diagram of current amplitude inverse transform circuit of the present invention.
Figure 11 is the voltage regulator circuit figure of voltage stabilizing chip U4 of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is a kind of based on transformer coupled analog signal isolating method, first unipolarity of the analog signal after amplitude transformation
Signal and square wave carrier signal, which enter, to be modulated to obtain amplitude-modulated wave in modulator；Amplitude-modulated wave recycles demodulator to synchronize solution
It adjusts, the low-pass filtered circuit of amplitude-modulated wave after synchronous demodulation is filtered, and is left low frequency similar with original analog frequency spectrum
Signal, finally low frequency signal similar with original analog frequency spectrum restores original analog signal by amplitude transformation.
It is a kind of based on transformer coupled analog signal isolating circuit, include amplitude converting circuit, modulation and synchronous solution
Adjust filter circuit and amplitude inverse transform circuit；
See that Fig. 7, amplitude converting circuit include sensor interface JP1, zero-bit adjusting circuit, instrumentation amplifier U1, precision
Operational amplifier U2, potentiometer RG and several capacitors and resistance, it is by potentiometer RZ and resistance R4, resistance R1 that zero-bit, which adjusts circuit,
It is formed with resistance R2, one end ground connection of resistance R4, a fixing end of the other end connection potentiometer RZ of resistance R4, potentiometer RZ's
Another fixing end is connect with one end of resistance R2, and the other end of resistance R2 connects regulated power supply E+, and the adjustable end of potentiometer RZ is logical
It crosses resistance R4 to connect with the IN+ pin of sensor interface JP1, the IN+ pin of sensor interface JP1 is same with instrumentation amplifier U1's
The connection of phase input terminal, the GND pin of sensor interface JP1 are connect with the inverting input terminal of instrumentation amplifier U1, instrumentation amplifier
The output end of U1 is connect with the non-inverting input terminal of precision operational-amplifier U2, and the inverting input terminal of precision operational-amplifier U2 passes through
Potentiometer RG ground connection, the output end of precision operational-amplifier U2 are transformed as the output end output amplitude of amplitude converting circuit
Unipolar signal Vin1；Analog signal can access unipolarity and differential signal, the small signal of difference analogue exported with sensor
For, the amplitude transformation to differential analog signal is realized by instrumentation amplifier U1 and precision operational-amplifier U2, potentiometer RZ and
R4, R1, R2 form zeroing circuit, realize and adjust to the zero-bit of differential signal, and amplitude adjusting can be realized by potentiometer RG；
See Fig. 8, modulation and synchronous demodulation filter circuit include reverse protection diode D1, self-recovery fuse F1, just
Grade low-pass filter circuit, resistance R20, resistance R22, capacitor C11, capacitor C12, NPN triode Q4, NPN triode Q5, high frequency become
Depressor T1, diode D5, field-effect tube Q6, high frequency transformer T2, diode D10, field-effect tube Q7 and two-stage low-pass wave electricity
The anode on road, reverse protection diode D1 is connect with 24V DC power supply, and anode and the self- recoverage of reverse protection diode D1 insures
One end connection of silk F1, the other end of self-recovery fuse F1 are connect with the input terminal of preliminary low-pass wave circuit, resistance R20's
One end, resistance R22 one end connect with the output end of preliminary low-pass wave circuit, the other end and NPN triode of resistance R20
The base stage of Q4 connects, and the other end of resistance R22 is connect with the base stage of NPN triode Q5, and the collector of NPN triode Q4 passes through electricity
Hold C11 to connect with the base stage of NPN triode Q5, the collector of NPN triode Q5 passes through the base of capacitor C12 and NPN triode Q4
Pole connection, the emitter of NPN triode Q4 and the emitter of NPN triode Q5 are grounded, the collector and height of NPN triode Q4
One end of frequency power transformer T1 primary coil connects, and the collector of NPN triode Q5 is another with high frequency transformer T1 primary coil
The T1 primary coil of end connection, preliminary low-pass wave circuit output end and high frequency transformer is connected to excitation power supply, and high frequency becomes
The secondary of depressor T1 generates the mutually isolated and independent Symmetrical power supply in three tunnels, and the first via secondary of high frequency transformer T1 is formed
8V Symmetrical power supply, high frequency transformer T1 the second tunnel secondary form 14V Symmetrical power supply, and the secondary anode of the first via with
The cathode of diode D5 connects, and the anode of diode D5 is connect with the grid of field-effect tube Q6, the source electrode of field-effect tube Q6 and the
The connection of secondary cathode, the drain electrode of field-effect tube Q6 are connect with one end of high frequency transformer T2 all the way, and high frequency transformer T2's is another
The connection of the output end of one end and amplitude converting circuit, one end of T2 grade of high frequency transformer are connect with the drain electrode of field-effect tube Q7,
The source electrode of field-effect tube Q7 is grounded, and the grid of field-effect tube Q7 is connect with the cathode of diode D10, and the anode of diode D10 is even
+ 14V power supply is connect, two-stage low-pass wave circuit is made of resistance R12, capacitor C22, capacitor C23, resistance R26 and capacitor C28,
One end of capacitor C28 is connect with one end of T2 grade of high frequency transformer, and one end other end of capacitor C28 passes through resistance R26 and height
The other end of T2 grade of frequency power transformer connects, one end of resistance R12, capacitor C22 one end with T2 grade of high frequency transformer
Other end connection, the other end of resistance R12 and one end of capacitor C23 are connected to filtering voltage output end, and capacitor C22's is another
The other end of one end and capacitor C23 ground connection；It is pushed away by what the primary of R20, R22, C11, C12, Q4, Q5 and high frequency transformer T1 formed
The square-wave signal for drawing circuit generation 40KHz is used to motivate the primary of T1, mutually isolated and independent on three tunnels of secondary generation of T1
Symmetrical power supply；Primary by D5 and field-effect tube Q6 and high frequency transformer T2 is realized to square wave carrier signal and by amplitude
Transformed analog signal Vin1 is modulated；The primary of T2 is 1:1 with secondary turn ratio, is imitated by the primary of T2, D10 and field
Should pipe Q7 form synchronous demodulation circuit, by the low-pass filter circuit that is made of R12, C22, C23 and R26, C28 to synchronous demodulation
Amplitude-modulated wave afterwards is filtered to obtain unipolar voltage signal Vo1.
Wherein, the first via secondary of high frequency transformer T1 passes through diode D3, diode D4, electrolytic capacitor E1, electrolysis electricity
The circuit for holding E2, capacitor C9 and capacitor C10 composition forms 8V Symmetrical power supply, and the cathode of diode D3, diode D4 are just
It is extremely connect with one end of first via secondary, the anode of diode D3, the cathode of electrolytic capacitor E1 are connected with one end of capacitor C9
As -8V power output end, one end of the cathode of diode D4, the anode of electrolytic capacitor E2 and capacitor C10 is connected to+8V electricity
Source output terminal, the other end company of the anode of electrolytic capacitor E1, the cathode of electrolytic capacitor E2, the other end of capacitor C9 and capacitor C10
It connects as ground terminal GND；The cathode power supply input terminal of instrumentation amplifier U1 and precision operational-amplifier U2 is exported with+8V power supply
The positive and negative power supply input terminal of end connection, instrumentation amplifier U1 and precision operational-amplifier U2 are connect with -8V power output end；
The second tunnel secondary of high frequency transformer T1 by diode D7, diode D9, electrolytic capacitor E4, electrolytic capacitor E6, capacitor C14 and
The circuit of capacitor C16 composition forms 14V Symmetrical power supply, the anode of diode D7, diode D9 cathode and the first via
Secondary one end connection, one end of the cathode of diode D7, the anode of electrolytic capacitor E4 and capacitor C14 is connected to+14V power supply
It is defeated that one end of the anode of output end+14V1, diode D9, the cathode of electrolytic capacitor E6 and capacitor C16 is connected to -14V power supply
Outlet -14V1, the cathode of electrolytic capacitor E4, the anode of electrolytic capacitor E6, the other end of capacitor C14 and capacitor C16 the other end
It is connected to ground terminal GND1；+ 14V power output end+14V1 exports regulated power supply E+ by voltage stabilizing chip U4 (see Figure 11), becomes
The second tunnel secondary of depressor T1 is coupled with the auxiliary primary windings of transformer T1, and the auxiliary primary windings of transformer T1 pass through two poles
The circuit formation 14V Symmetrical of pipe D6, diode D8, electrolytic capacitor E3, electrolytic capacitor E5, capacitor C13 and capacitor C15 composition
Power supply, the anode of diode D6, the cathode of diode D8 are connect with one end of transformer T1 auxiliary primary windings, diode D6
Cathode, the anode of electrolytic capacitor E3 and one end of capacitor C13 be connected to+14V power output end+14V2, diode D8's
One end of anode, the cathode of electrolytic capacitor E5 and capacitor C15 is connected to -14V power output end -14V2, electrolytic capacitor E3's
Cathode, the anode of electrolytic capacitor E5, the other end of capacitor C13 and capacitor C15 the other end be connected to ground terminal GND2；Voltage
The cathode power supply input terminal of the operational amplifier U3 of amplitude inverse transform circuit or current amplitude inverse transform circuit with+14V power supply
The negative electricity of the operational amplifier U3 of output end+14V2 connection, voltage magnitude inverse transform circuit or current amplitude inverse transform circuit
Source input terminal is connect with -14V power output end -14V2；
Amplitude inverse transform circuit selects voltage magnitude inverse transform circuit or current amplitude inverse transform circuit；
See after Fig. 9, voltage magnitude inverse transform circuit carry out amplitude transformation to Vo1 and obtain the output of normal voltage pick-up signal,
Voltage magnitude inverse transform circuit includes operational amplifier U3, socket P1, socket P2, resistance R7, resistance R24, capacitor C21, electricity
The pin 3 of R18, resistance R15, diode D1, capacitor C17, capacitor C18 and resistance R14, socket P1 are hindered for filtering voltage input
End, pin 1 are ground terminal, and the pin 1 of socket P1 is filtering voltage input terminal, pin 3 is ground terminal, the pin 2 and 3 of socket P1
It being shorted, the pin 2 and 3 of socket P2, the pin 2 of socket P1 is connect by resistance R7 with the non-inverting input terminal of operational amplifier U3,
Pin 2 after socket P2 short circuit passes through the inverting input terminal of resistance R24 and operational amplifier U3, and capacitor C21 and resistance R18 are in parallel
Afterwards one end connect with the inverting input terminal of operational amplifier U3, capacitor C21 and resistance R18 it is in parallel after the other end, operation amplifier
The output end of device U3, the anode of diode D1 are connect with one end of resistance R15, the cathode connection+14V power supply of diode D1,
One end of resistance R14, one end of capacitor C17 are connect with the other end of resistance R15, the other end of resistance R14 and capacitor C18's
One end is connected to normal voltage pick-up signal output end, and the other end of capacitor C17, the other end of capacitor C18 are grounded；
See after Figure 10, current amplitude inverse transform circuit carry out V/I transformation to Vo1 and obtains the output of electric current pick-up signal, electric current
Amplitude inverse transform circuit include operational amplifier U3, socket P1, socket P2, socket P3, resistance R7, resistance R24, capacitor C21,
Resistance R18, resistance R15, diode D1, capacitor C17, capacitor C18, resistance R8, resistance R25, resistance R17, diode D2, PNP
Triode Q1, PNP triode Q2 and NPN triode Q3, the pin 3 of socket P1 is filtering voltage input terminal, pin 1 is ground connection
End, the pin 1 of socket P1 is filtering voltage input terminal, pin 3 is ground terminal, and the pin 2 and 1 of socket P1 is shorted, socket P2's
The pin 2 of pin 2 and 1, socket P1 is connect by resistance R7 with the non-inverting input terminal of operational amplifier U3, the pin 2 of socket P2
By the inverting input terminal of resistance R24 and operational amplifier U3, capacitor C21 and resistance R18 it is in parallel after one end and operation amplifier
The inverting input terminal of device U3 connects, capacitor C21 and resistance R18 it is in parallel after the other end, PNP triode Q2 emitter with insert
Seat P3 pin 2 connect, the output end of operational amplifier U3, the anode of diode D1, socket P3 pin 1 with resistance R15
One end connection, the cathode connection+14V power supply of diode D1, one end of capacitor C17, one end of capacitor C18, PNP triode Q1
Base stage, the collector of PNP triode Q2, the cathode of diode D2, resistance R15 the other end be connected to electric current pick-up signal
Output end, the other end of capacitor C17 and the other end of capacitor C18 are grounded, and one end of resistance R8 is same with operational amplifier U3's
The connection of phase input terminal, the other end of resistance R8 are connect with+14V power supply, and one end of resistance R25 is connect with+14V power supply, resistance R17
One end connect with+14V power supply, the other end of resistance R25 is connect with the emitter of PNP triode Q2, and resistance R17's is another
End, the base stage of PNP triode Q2, PNP triode Q1 emitter connect with the collector of NPN triode Q3, PNP triode
The collector of Q1 is connect with the base stage of NPN triode Q3, and the collector of NPN triode Q3 is connect with the anode of diode D2.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of based on transformer coupled analog signal isolating method, it is characterised in that: using analog signal as modulated signal,
The square-wave signal of higher-frequency is believed analog signal and square wave using high frequency transformer as analog multiplier as carrier signal
Number carrying out time domain product by analog multiplier obtains amplitude-modulated wave, after recycling synchronous demodulation method to demodulate amplitude-modulated wave again
Low-pass filtering is carried out to restore original analog signal.
2. according to claim 1 a kind of based on transformer coupled analog signal isolating method, it is characterised in that: first
Unipolar signal and square wave carrier signal of the analog signal after amplitude transformation, which enter, to be modulated to obtain amplitude-modulated wave in modulator；
Amplitude-modulated wave recycles demodulator to synchronize demodulation, and the low-pass filtered circuit of the amplitude-modulated wave after synchronous demodulation is filtered, and is left
Low frequency signal similar with original analog frequency spectrum, finally low frequency signal similar with original analog frequency spectrum passes through amplitude
Transformation restores original analog signal.
3. based on claim 1 the method based on transformer coupled analog signal isolating circuit, it is characterised in that: including
There are amplitude converting circuit, modulation and synchronous demodulation filter circuit and amplitude inverse transform circuit；
The amplitude converting circuit includes sensor interface JP1, zero-bit adjusting circuit, instrumentation amplifier U1, accurate operation
Amplifier U2, potentiometer RG and several capacitors and resistance, the zero-bit adjust circuit connection in the IN+ of sensor interface JP1
On pin, the IN+ pin of sensor interface JP1 is connect with the non-inverting input terminal of instrumentation amplifier U1, sensor interface JP1's
GND pin is connect with the inverting input terminal of instrumentation amplifier U1, the output end and precision operational-amplifier U2 of instrumentation amplifier U1
Non-inverting input terminal connection, the inverting input terminal of precision operational-amplifier U2 is grounded by potentiometer RG, precision operational-amplifier
Output end output amplitude transformed unipolar signal Vin1 of the output end of U2 as amplitude converting circuit；
The modulation and synchronous demodulation filter circuit include reverse protection diode D1, self-recovery fuse F1, primary low
Bandpass filter circuit, resistance R20, resistance R22, capacitor C11, capacitor C12, NPN triode Q4, NPN triode Q5, high frequency transformer
T1, diode D5, field-effect tube Q6, high frequency transformer T2, diode D10, field-effect tube Q7 and two-stage low-pass wave circuit, institute
The anode of the reverse protection diode D1 stated is connect with 24V DC power supply, and anode and the self- recoverage of reverse protection diode D1 is protected
One end of dangerous silk F1 connects, and the other end of self-recovery fuse F1 is connect with the input terminal of preliminary low-pass wave circuit, resistance R20
One end, resistance R22 one end connect with the output end of preliminary low-pass wave circuit, the other end of resistance R20 and tri- pole NPN
The base stage of pipe Q4 connects, and the other end of resistance R22 is connect with the base stage of NPN triode Q5, and the collector of NPN triode Q4 passes through
Capacitor C11 is connect with the base stage of NPN triode Q5, and the collector of NPN triode Q5 passes through capacitor C12's and NPN triode Q4
Base stage connection, the emitter of NPN triode Q4 and the emitter of NPN triode Q5 be grounded, the collector of NPN triode Q4 with
One end of high frequency transformer T1 primary coil connects, and the collector of NPN triode Q5 is another with high frequency transformer T1 primary coil
The T1 primary coil of one end connection, preliminary low-pass wave circuit output end and high frequency transformer is connected to excitation power supply, high frequency
The secondary of transformer T1 generates the mutually isolated and independent Symmetrical power supply in three tunnels, the first via secondary shape of high frequency transformer T1
At 8V Symmetrical power supply, high frequency transformer T1 the second tunnel secondary forms 14V Symmetrical power supply, and the anode of first via secondary
Connect with the cathode of diode D5, diode D5 anode connect with the grid of field-effect tube Q6, the source electrode of field-effect tube Q6 and
The cathode of first via secondary connects, and the drain electrode of field-effect tube Q6 is connect with one end of high frequency transformer T2, high frequency transformer T2's
The connection of the output end of the other end and amplitude converting circuit, one end of T2 grade of high frequency transformer and the drain electrode of field-effect tube Q7 connect
It connects, the source electrode ground connection of field-effect tube Q7, the grid of field-effect tube Q7 is connect with the cathode of diode D10, the anode of diode D10
Connection+14V power supply, two-stage low-pass wave circuit are by resistance R12, capacitor C22, capacitor C23, resistance R26 and capacitor C28 group
At, one end of capacitor C28 is connect with one end of T2 grade of high frequency transformer, one end other end of capacitor C28 by resistance R26 with
The other end of T2 grade of high frequency transformer connects, one end of resistance R12, capacitor C22 one end with T2 grade of high frequency transformer
Other end connection, the other end of resistance R12 and one end of capacitor C23 be connected to filtering voltage output end, capacitor C22's
The other end of the other end and capacitor C23 ground connection；
The amplitude inverse transform circuit selects voltage magnitude inverse transform circuit or current amplitude inverse transform circuit；Voltage magnitude is inverse
Translation circuit includes operational amplifier U3, socket P1, socket P2, resistance R7, resistance R24, capacitor C21, resistance R18, resistance
R15, diode D1, capacitor C17, capacitor C18 and resistance R14, the socket P1 pin 3 be filtering voltage input terminal, draw
Foot 1 is ground terminal, and the pin 1 of the socket P1 is filtering voltage input terminal, pin 3 is ground terminal, the socket P1's
Pin 2 and 3 is shorted, the pin 2 and 3 of socket P2, and the pin 2 of socket P1 passes through the homophase input of resistance R7 and operational amplifier U3
End connects, and the pin 2 after socket P2 short circuit passes through the inverting input terminal of resistance R24 and operational amplifier U3, capacitor C21 and resistance
One end connect with the inverting input terminal of operational amplifier U3, the other end after capacitor C21 and resistance R18 parallel connection, transports after R18 is in parallel
The anode of the output end, diode D1 of calculating amplifier U3 is connect with one end of resistance R15, the cathode connection+14V of diode D1
Power supply, one end of resistance R14, one end of capacitor C17 are connect with the other end of resistance R15, the other end and capacitor of resistance R14
One end of C18 is connected to normal voltage pick-up signal output end, and the other end of capacitor C17, the other end of capacitor C18 connect
Ground；
The current amplitude inverse transform circuit includes operational amplifier U3, socket P1, socket P2, socket P3, resistance R7, electricity
Hinder R24, capacitor C21, resistance R18, resistance R15, diode D1, capacitor C17, capacitor C18, resistance R8, resistance R25, resistance
R17, diode D2, PNP triode Q1, PNP triode Q2 and NPN triode Q3, the socket P1 pin 3 be filtered electrical
Pressing input terminal, pin 1 is ground terminal, and the pin 1 of the socket P1 is filtering voltage input terminal, pin 3 is ground terminal, described
The pin 2 and 1 of socket P1 be shorted, the pin 2 and 1 of socket P2, the pin 2 of socket P1 passes through resistance R7 and operational amplifier U3
Non-inverting input terminal connection, the pin 2 of socket P2 passes through the inverting input terminal of resistance R24 and operational amplifier U3, capacitor C21 with
One end after resistance R18 is in parallel is connect with the inverting input terminal of operational amplifier U3, another after capacitor C21 and resistance R18 parallel connection
One end, PNP triode Q2 emitter connect with the pin 2 of socket P3, the output end of operational amplifier U3, diode D1
Positive, socket P3 pin 1 is connect with one end of resistance R15, the cathode connection+14V power supply of diode D1, capacitor C17's
One end, one end of capacitor C18, the base stage of PNP triode Q1, the collector of PNP triode Q2, the cathode of diode D2, resistance
The other end of R15 is connected to electric current pick-up signal output end, and the other end of capacitor C17 and the other end of capacitor C18 are grounded,
One end of resistance R8 is connect with the non-inverting input terminal of operational amplifier U3, and the other end of resistance R8 is connect with+14V power supply, resistance
One end of R25 is connect with+14V power supply, and one end of resistance R17 is connect with+14V power supply, the other end of resistance R25 with PNP tri-
The emitter of pole pipe Q2 connects, the other end of resistance R17, the base stage of PNP triode Q2, PNP triode Q1 emitter with
The collector of NPN triode Q3 connects, and the collector of PNP triode Q1 is connect with the base stage of NPN triode Q3, NPN triode
The collector of Q3 is connect with the anode of diode D2.
4. according to claim 3 based on transformer coupled analog signal isolating circuit, it is characterised in that: described zero
Position adjusts circuit and is made of potentiometer RZ and resistance R4, resistance R1 and resistance R2, and one end ground connection of resistance R4, resistance R4's is another
One end connects a fixing end of potentiometer RZ, and another fixing end of potentiometer RZ is connect with one end of resistance R2, and resistance R2's is another
One end connects regulated power supply E+, and the adjustable end of potentiometer RZ is connect by resistance R4 with the IN+ pin of sensor interface JP1.
5. according to claim 3 based on transformer coupled analog signal isolating circuit, it is characterised in that: the height
The first via secondary of frequency power transformer T1 passes through diode D3, diode D4, electrolytic capacitor E1, electrolytic capacitor E2, capacitor C9 and electricity
The circuit for holding C10 composition forms 8V Symmetrical power supply, and cathode, the anode of diode D4 of diode D3 is secondary with the first via
One end connection, one end of the anode of diode D3, the cathode of electrolytic capacitor E1 and capacitor C9 be connected to -8V power supply output
End, one end of the cathode of diode D4, the anode of electrolytic capacitor E2 and capacitor C10 are connected to+8V power output end, electrolysis electricity
The other end for holding the anode of E1, the cathode of electrolytic capacitor E2, the other end of capacitor C9 and capacitor C10 is connected to ground terminal GND；
The cathode power supply input terminal of the instrumentation amplifier U1 and precision operational-amplifier U2 are connect with+8V power output end, instrument
The positive and negative power supply input terminal of device amplifier U1 and precision operational-amplifier U2 is connect with -8V power output end.
6. according to claim 4 based on transformer coupled analog signal isolating circuit, it is characterised in that: the height
The second tunnel secondary of frequency power transformer T1 passes through diode D7, diode D9, electrolytic capacitor E4, electrolytic capacitor E6, capacitor C14 and electricity
The circuit for holding C16 composition forms 14V Symmetrical power supply, and anode, the cathode of diode D9 of diode D7 is secondary with the first via
One end connection of grade, it is defeated that one end of the cathode of diode D7, the anode of electrolytic capacitor E4 and capacitor C14 is connected to+14V power supply
One end of the anode of outlet+14V1, diode D9, the cathode of electrolytic capacitor E6 and capacitor C16 is connected to the output of -14V power supply
End -14V1, the other end company of the cathode of electrolytic capacitor E4, the anode of electrolytic capacitor E6, the other end of capacitor C14 and capacitor C16
It connects as ground terminal GND1；+ 14V power output end+14V1 exports regulated power supply E+ by voltage stabilizing chip U4, and the of transformer T1
Two tunnel secondary are coupled with the auxiliary primary windings of transformer T1, and the auxiliary primary windings of transformer T1 pass through diode D6, two poles
The circuit formation 14V Symmetrical power supply of pipe D8, electrolytic capacitor E3, electrolytic capacitor E5, capacitor C13 and capacitor C15 composition, two poles
The anode of pipe D6, the cathode of diode D8 are connect with one end of transformer T1 auxiliary primary windings, cathode, the electricity of diode D6
The anode of solution capacitor E3 and one end of capacitor C13 are connected to+14V power output end+14V2, the anode of diode D8, electrolysis
The cathode of capacitor E5 and one end of capacitor C15 are connected to -14V power output end -14V2, the cathode of electrolytic capacitor E3, electrolysis
The other end of the anode of capacitor E5, the other end of capacitor C13 and capacitor C15 is connected to ground terminal GND2；Voltage magnitude inversion
Change the cathode power supply input terminal of the operational amplifier U3 of circuit or current amplitude inverse transform circuit with+14V power output end+
The negative power supply input terminal of the operational amplifier U3 of 14V2 connection, voltage magnitude inverse transform circuit or current amplitude inverse transform circuit
It is connect with -14V power output end -14V2.
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