CN205829588U - A kind of DC voltage amplifier that can suppress high common-mode voltage - Google Patents
A kind of DC voltage amplifier that can suppress high common-mode voltage Download PDFInfo
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- CN205829588U CN205829588U CN201620588097.7U CN201620588097U CN205829588U CN 205829588 U CN205829588 U CN 205829588U CN 201620588097 U CN201620588097 U CN 201620588097U CN 205829588 U CN205829588 U CN 205829588U
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- chopping switch
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Abstract
This utility model relates to a kind of DC voltage amplifier that can suppress high common-mode voltage, including input coil, feedback coil, output winding, chopping switch, exchange bandpass amplifier, demodulator, low-pass filter amplifier, feedback resistance and controller；Input coil is connected with input signal by input signal chopping switch；Feedback coil is connected with feedback resistance R2 by feedback signal chopping switch；The Same Name of Ends of output winding is connected with the positive input of exchange bandpass amplifier, and the other end of output winding is connected with the negative input of exchange bandpass amplifier；The outfan of exchange bandpass amplifier is connected with the input of demodulator, and the outfan of demodulator is connected with the input of low-pass filter amplifier, output voltage VoIt is connected with feedback coil after feedback resistance R2 dividing potential drop through feedback resistance R1；This utility model utilizes optical coupling and magnetic coupling so that amplifier has the highest common-mode voltage ability to bear and the highest common-mode voltage rejection ability.
Description
Technical field
This utility model relates to amplifier technique, a kind of high common-mode voltage suppression technology, and voltage amplifier circuit has
There are the highest common-mode voltage ability to bear and the highest common-mode voltage rejection ability.
Background technology
At the on-the-spot test environment such as Test System for Rocket Engine Test, test equipment distance measured signal distance, common-mode voltage is high,
Require that measurement equipment and calibrator (-ter) unit have the highest common-mode voltage and adapt to ability and rejection ability.Start at space flight liquid rocket
During the calibrating installation of machine scene pilot system is developed, it is desirable to it is 400V that the DC common mode of amplifier adapts to ability, and direct current is common
Mode voltage rejection ratio reaches 180dB；It is 200V that the exchange common-mode voltage requiring amplifier adapts to ability, exchange common-mode voltage suppression
Ratio reaches 150dB.And the common-mode voltage rejection ability of general amplifier is about 100dB, some high common mode rejection amplifier straight
Stream common-mode voltage rejection ratio can reach 120～150dB, and exchange common-mode voltage rejection ratio can reach 100～120dB, common mode
Voltage can only achieve a few volt, it is impossible to meets the calibration requirements of space flight liquid-propellant rocket engine scene pilot system.
Being illustrated in figure 1 existing a kind of amplifier architecture schematic diagram, this amplifier uses the difference of instrument operational amplifier
Dividing amplification mode, have higher common mode inhibition capacity, common-mode voltage rejection ratio can reach 100dB, but common-mode voltage is fitted
Scope is answered not can exceed that power supply voltage range, generally tens volts.
As in figure 2 it is shown, more existing operational amplifiers, use Differential Input, substitute the side of high value resistor with constant-current source
Method and laser adjust symmetric process, although substantially increase the common mode rejection ratio of amplifier, the highest DC common-mode
Voltage rejection ratio can reach 150dB, but common-mode voltage subject range not can exceed that power supply voltage range, and generally ten
Several volts.
In a word, the common-mode voltage of existing amplifier adapts to ability and common-mode voltage rejection ability, all can not meet space flight liquid
The calibration requirements of body rocket engine scene pilot system.
Summary of the invention
Common-mode voltage adaptation ability and common-mode voltage rejection ability in order to solve existing amplifier can not meet space flight liquid
The problem of the calibration requirements of body rocket engine scene pilot system, this utility model provides a kind of high common-mode voltage rejection ratio to put
Big device.
The technical solution of the utility model is as follows:
A kind of DC voltage amplifier that can suppress high common-mode voltage, it is characterized in that and includes input coil 4, anti-
Feeder line circle 5, output winding 6, annular high permeability magnetic core 15, input signal chopping switch (S1, S2), feedback signal chopping switch
(S3, S4), exchange bandpass amplifier 9, demodulator 11, low-pass filter amplifier 12, feedback resistance R1, feedback resistance R2 and control
Device 7 processed, described input coil 4 is isolated by high insulant, is wound in high permeability magnetic core 15；Input coil is by input
Signal chopping switch (S1, S2) is connected with input signal；
Described feedback coil is isolated by high insulant, is wound in high permeability magnetic core；Feedback coil is by feedback
Signal chopping switch (S3, S4) is connected with feedback resistance R2；
Described input coil and the equal turn numbers of feedback coil, be n1Circle, the Same Name of Ends of input coil 4 and input signal
Chopping switch S1 connects, and the Same Name of Ends of feedback coil is connected with feedback signal chopping switch S3；
Described output winding is isolated by high insulant, is wound in high permeability magnetic core, and the number of turn of output winding is
n2Circle, n2＞ n1, the Same Name of Ends of described output winding is connected with the positive input of exchange bandpass amplifier 9, described output winding
The other end of 4 is connected with the negative input of exchange bandpass amplifier 9；The input of described exchange bandpass amplifier 9 and output
Coil is connected, and the outfan of described exchange bandpass amplifier 9 is connected with the input of demodulator 11, described demodulator 11 defeated
Go out end to be connected with the input of low-pass filter amplifier 12, the outfan output voltage V of described low-pass filter amplifier 12o, defeated
Go out voltage VoIt is connected with feedback coil after feedback resistance R2 dividing potential drop through feedback resistance R1；
Described controller produces 3 control signals, and control signal one controls input signal chopping switch S1 and feedback signal
Chopping switch S4 synchronization action；Control signal two is anti-phase with control signal one, controls input signal chopping switch S2 and feedback letter
Number chopping switch S3 synchronization action；Control signal three and control signal one homophase, control demodulator work.
The passband central frequency of exchange bandpass amplifier 9 is identical with chopping switch operating frequency.
Input signal chopping switch controls power supply to be provided by light cell one；The low side of light cell one and the midpoint of input coil
Connect.
Feedback signal chopping switch controls power supply to be provided by light cell two；The low side of light cell two and the midpoint of feedback coil
Connect.
3 control signals all use optocoupler or magnetic coupling to isolate.
It is additionally provided with capacitance C between above-mentioned exchange bandpass amplifier 9 and demodulator 11.
Technique effect of the present utility model is as follows:
1, this utility model utilizes optical coupling and magnetic coupling, carries out the biography of input signal, control signal, Feedback Signal Energy
Pass, it is achieved the high-insulation of input circuit and other multichannel so that amplifier has the highest common-mode voltage ability to bear and very
High common-mode voltage rejection ability.
2, use the technical solution of the utility model, there is good common-mode voltage and adapt to ability and common-mode voltage suppression energy
Power.Common-mode voltage >=100V, common-mode voltage rejection ratio >=150dB.
Accompanying drawing explanation
Fig. 1 is the difference amplifier of existing instrument operational amplifier.
Fig. 2 is that existing amplifier improves common-mode voltage rejection ability schematic diagram.
Fig. 3 is for implementing circuit structure schematic diagram of the present utility model.
Reference lists as follows: the differential amplification pattern of 1-instrument operational amplifier；2-differential input end；3-constant current
Source；4-input coil；5-feedback coil；6-output winding；7-photoelectric isolation module；9-exchanges bandpass amplifier；11-demodulates
Device；12-low-pass filter amplifier；15-annular high permeability magnetic core；16-amplifier in；17-amplifier out, 18-
Light cell one, 19-light cell two.
Detailed description of the invention
3 pairs of this utility model illustrate below in conjunction with the accompanying drawings.
A kind of DC voltage amplifier that can suppress high common-mode voltage, including amplifier in 16, input coil 4, anti-
Feeder line circle 5, output winding 6, annular high permeability magnetic core 15, input signal chopping switch (S1, S2), feedback signal chopping switch
(S3, S4), exchange bandpass amplifier 9, demodulator 11, low-pass filter amplifier 12, feedback resistance R1, feedback resistance R2 and low pass
Filter amplifier outfan 17.
Input coil 4 is isolated by high insulant, is wound in high permeability magnetic core；Input coil is inputted by input
Signal chopping switch (S1, S2) is connected with input signal, and input signal chopping switch controls power supply to be provided by light cell one；Light
The low side of battery 1 is connected with the midpoint of input coil.
Feedback coil is isolated by high insulant, is wound in high permeability magnetic core；Feedback coil passes through feedback signal
Chopping switch (S3, S4) is connected with feedback resistance R2, and feedback signal chopping switch controls power supply to be provided by light cell 2 19；Light
The low side of battery two is connected with the midpoint of feedback coil.
Controller sends 3 control signals, and control signal one controls input signal chopping switch S1 and feedback signal copped wave
Switch S4 synchronization action (be closed at or simultaneously switch off)；Control signal two is anti-phase with control signal one, controls input signal and cuts
Ripple switch S2 and feedback signal chopping switch S3 synchronization action.Control signal three and control signal one homophase, control demodulator work
Make.3 control signals all use optocoupler or magnetic coupling to isolate.
Input coil and the equal turn numbers of feedback coil, be n1Circle, No. * is Same Name of Ends.
Output winding is isolated by high insulant, is wound in high permeability magnetic core, and the output winding number of turn is n2Circle, n2
＞ n1, n2/n1=k1, No. * is Same Name of Ends.
The input of exchange bandpass amplifier 9 is connected with output winding, the passband central frequency of exchange bandpass amplifier 9
Identical with chopping switch operating frequency.The alternating voltage that output winding is exported by exchange bandpass amplifier 9 amplifies k2Times, k2For handing over
The amplification coefficient of stream bandpass amplifier, the outfan of exchange bandpass amplifier is through the input phase of capacitance with demodulator 11
Connect.
Demodulator works asynchronously with controller 7, and bipolarity AC signal is converted to unipolar fluctuating signal.
The input of low-pass filter amplifier 12 is connected with the outfan of demodulator 11, is believed by unipolar pulsating volage
Number be converted to d. c. voltage signal, and amplify k3Times；k3Amplification coefficient for low-pass filter amplifier.
Low-pass filter amplifier 12 outfan is connected with feedback resistance R1 and amplifier out OUT.Amplifier exports
The output voltage of end is connected with feedback coil after feedback resistance R2 dividing potential drop through feedback resistance R1.
Can suppress the amplifier of high common-mode voltage, after negative feedback is automatically adjusted, enter steady statue, amplifier exports
End output voltage is:
Fig. 3 is for implementing circuit structure schematic diagram of the present utility model.As it is shown on figure 3, the height that can suppress of institute's utility model is total to
The amplifier of mode voltage includes amplifier in, input coil, feedback coil, output winding, annular high permeability magnetic core, defeated
Enter signal chopping switch, feedback signal chopping switch, exchange bandpass amplifier, demodulator, low-pass filter amplifier, feedback resistance
R1, feedback resistance R2 and amplifier out.Input coil is isolated by high insulant, is wound in high permeability magnetic core,
And be connected with input signal by chopping switch, chopping switch controls power supply to be provided by battery, the low side of battery and input line
The midpoint of circle connects.Feedback coil is isolated by high insulant, is wound in high permeability magnetic core, and by chopping switch with
Feedback resistance R2 is connected, and the chopping switch of feedback coil controls power supply to be provided by another battery, the low side of battery and feedback
The midpoint of coil connects.Input coil and the equal turn numbers of feedback coil, be n1Circle, No. * is Same Name of Ends.Controller sends 3
Individual control signal, control signal x1 controls chopping switch S1 and S4 synchronization action (be closed at or simultaneously switch off)；Control signal
X2 is anti-phase with control signal x1, controls chopping switch S2 and S3 synchronization action.Control signal x3 and control signal 1 homophase, control
Demodulator works.3 control signals all use optocoupler (or magnetic coupling) to isolate.Output winding by high insulant every
From, it being wound in high permeability magnetic core, chopper controls power supply to be provided by light cell two, the low side of light cell two and feedback coil
Midpoint connect；The output winding number of turn is n2Circle, n2＞ n1, n2/n1=k1, No. * is Same Name of Ends.Controller utilizes with chopping switch
Photoelectrical coupler (magnetic coupler) transmission control signal, it is achieved circuit is isolated.The input of exchange bandpass amplifier and output lead
Circle is connected, and passband central frequency is identical with chopping switch operating frequency.The friendship that output winding is exported by exchange bandpass amplifier
Stream voltage amplification k2Times.The outfan of exchange bandpass amplifier is connected with the input of demodulator through capacitance.Control
Device controls demodulator and works asynchronously with chopper, bipolarity AC signal is converted to unipolar fluctuating signal, and passes through phase
Position control realization outfan and input homophase.The input of low-pass filter amplifier is connected with the outfan of demodulator, will be single
The pulsating voltage signal of polarity is converted to d. c. voltage signal, and amplifies k3Times；Low-pass filter amplifier outfan and feedback electricity
Resistance R1 is connected with amplifier out OUT.The output voltage of amplifier out is through feedback resistance R1 and feedback resistance R2
It is connected with feedback coil after dividing potential drop.The amplifier that can suppress high common-mode voltage of utility model, is automatically adjusted through negative feedback
After, entering steady statue, amplifier out output voltage is:
As follows to further description of the present utility model:
As it is shown on figure 3, input coil and feedback coil are 2000 circles in the present embodiment, output winding is 10000 circles, electricity
Sensibility reciprocal 160mH, chopping switch operating frequency is 100kHz, input impedance 100k Ω.Output winding and turn ratio k1 of input coil
Being 10, the noise of alternative current amplifier reduces by 10 times.Exchange bandpass amplifier transmission coefficient near mid frequency is 103；Solve
The voltage carry-over factor adjusting device is 0.5；Low-pass filter amplifier is 10 for DC voltage carry-over factor5；The electricity of forward path
Pressure carry-over factor is 5 × 108；Feedback resistance R2 uses precision metallic paper tinsel resistance, and resistance is 9.99k Ω；Feedback resistance R1 uses
Precision metallic paper tinsel resistance, resistance is 10 Ω；Amplifier magnification ratio is 1+999=1000.
Open-loop gain affects 2 × 10 to closed-loop gain-9, it is negligible；
The impact of closed-loop gain is by input impedance: R2/Ri=10 Ω/100k Ω=10-4；In view of input impedance
Relevant with winding inductance quantity and operating frequency, its value is the most stable.Therefore, after being calibrated by amplification, only input
The variable quantity of impedance affects closed-loop gain.Relative variation≤5/100 of input impedance, closed loop is put by input impedance change
The impact of big multiple is R2/Ri× 5/100=5 × 10-6。
The common mode rejection ratio of alternative current amplifier is 100dB, supply voltage is ± 15V time maximum common mode voltage be ± 14V.
In the present embodiment, input coil uses polytetrafluoroethylmaterial material, D.C. isolation resistance with the insulation of other coil
≥1012Ω, pressure >=1kV；Input coil exchanges insulation impedance >=3 × 10 with other coil8Ω, ac voltage withstanding >=500V；
DC common mode, through insulation resistance and the dividing potential drop of feedback resistance R2, produces common mode shadow by the pressure drop on R2 to amplifier
Ringing, therefore, DC common mode rejection ratio is:
CMRRDC=20 × log (1012/ 10)=220 (dB)
It is 1kV that DC common mode adapts to ability；
Orthogonal stream common-mode voltage is through insulation AC impedance and the dividing potential drop of feedback resistance R2, by the alternating voltage pressure on R2
Fall, produces exchange common-mode influence to amplifier.Therefore, exchange common-mode voltage rejection ratio is:
CMRRAC=20 × log (3 × 108/ 10)=150 (dB)
It is 500V that exchange common-mode voltage adapts to ability.
Claims (6)
1. the DC voltage amplifier that can suppress high common-mode voltage, it is characterised in that: include input coil (4), feedback line
Circle (5), output winding (6), annular high permeability magnetic core (15), input signal chopping switch S1, input signal chopping switch S2,
Feedback signal chopping switch S3, feedback signal chopping switch S4, exchange bandpass amplifier (9), demodulator (11), low-pass filtering are put
Big device (12), feedback resistance R1, feedback resistance R2 and controller (7), described input coil (4) by high insulant every
From, it is wound in high permeability magnetic core (15)；Input coil is connected with input signal by input signal chopping switch (S1, S2)
Connect；
Described feedback coil is isolated by high insulant, is wound in high permeability magnetic core；Feedback coil passes through feedback signal
Chopping switch S3, feedback signal chopping switch S4 are connected with feedback resistance R2；
Described input coil and the equal turn numbers of feedback coil, be n1Circle, the Same Name of Ends of input coil (4) is cut with input signal
Ripple switch S1 connects, and the Same Name of Ends of feedback coil is connected with feedback signal chopping switch S3；
Described output winding is isolated by high insulant, is wound in high permeability magnetic core, and the number of turn of output winding is n2Circle,
n2＞ n1, the Same Name of Ends of described output winding is connected with the positive input of exchange bandpass amplifier (9), described output winding (4)
The other end with exchange bandpass amplifier (9) negative input be connected；The outfan of described exchange bandpass amplifier (9) and solution
The input adjusting device (11) connects, and the outfan of described demodulator (11) is connected with the input of low-pass filter amplifier (12),
The outfan output voltage V of described low-pass filter amplifier (12)o, output voltage VoThrough feedback resistance R1 and feedback resistance R2
It is connected with feedback coil after dividing potential drop；
Described controller produces 3 control signals, and control signal one controls input signal chopping switch S1 and feedback signal copped wave
Switch S4 synchronization action；Control signal two is anti-phase with control signal one, controls input signal chopping switch S2 and feedback signal is cut
Ripple switch S3 synchronization action；Control signal three and control signal one homophase, control demodulator work.
The DC voltage amplifier that can suppress high common-mode voltage the most according to claim 1, it is characterised in that: described exchange
The passband central frequency of bandpass amplifier (9) is identical with chopping switch operating frequency.
The DC voltage amplifier that can suppress high common-mode voltage the most according to claim 1 and 2, it is characterised in that:
Input signal chopping switch controls power supply to be provided by light cell one；The low side of light cell one connects with the midpoint of input coil
Connect.
The DC voltage amplifier that can suppress high common-mode voltage the most according to claim 3, it is characterised in that: feedback signal
Chopping switch controls power supply to be provided by light cell two；The low side of light cell two is connected with the midpoint of feedback coil.
The DC voltage amplifier that can suppress high common-mode voltage the most according to claim 4, it is characterised in that:
3 control signals all use optocoupler or magnetic coupling to isolate.
The DC voltage amplifier that can suppress high common-mode voltage the most according to claim 5, it is characterised in that:
It is additionally provided with capacitance C between described exchange bandpass amplifier (9) and demodulator (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620588097.7U CN205829588U (en) | 2016-06-16 | 2016-06-16 | A kind of DC voltage amplifier that can suppress high common-mode voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620588097.7U CN205829588U (en) | 2016-06-16 | 2016-06-16 | A kind of DC voltage amplifier that can suppress high common-mode voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205829588U true CN205829588U (en) | 2016-12-21 |
Family
ID=57568906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620588097.7U Withdrawn - After Issue CN205829588U (en) | 2016-06-16 | 2016-06-16 | A kind of DC voltage amplifier that can suppress high common-mode voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205829588U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978517A (en) * | 2016-06-16 | 2016-09-28 | 西安航天计量测试研究所 | Direct-current voltage amplifier capable of restraining high common-mode voltage |
-
2016
- 2016-06-16 CN CN201620588097.7U patent/CN205829588U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978517A (en) * | 2016-06-16 | 2016-09-28 | 西安航天计量测试研究所 | Direct-current voltage amplifier capable of restraining high common-mode voltage |
| CN105978517B (en) * | 2016-06-16 | 2018-05-25 | 西安航天计量测试研究所 | A kind of DC voltage amplifier that can inhibit high common-mode voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20161221 Effective date of abandoning: 20180525 |