CN105763163B - A kind of superelevation frequency weak signal combined amplifier - Google Patents

A kind of superelevation frequency weak signal combined amplifier Download PDF

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Publication number
CN105763163B
CN105763163B CN201610078155.6A CN201610078155A CN105763163B CN 105763163 B CN105763163 B CN 105763163B CN 201610078155 A CN201610078155 A CN 201610078155A CN 105763163 B CN105763163 B CN 105763163B
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signal
resistance
operational amplifier
amplifier
capacitance
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CN105763163A (en
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赵玉顺
郑学慧
曹信杰
夏富生
唐昊
傅毓斐
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ANHUI FUSION INTELLIGENT TECHNOLOGY Co.,Ltd.
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Intelligent Manufacturing Institute Of Hfut
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    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3211Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189High frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics

Abstract

The invention belongs to power equipment high-frequency local dischargings to monitor field, more particularly to a kind of superelevation frequency weak signal combined amplifier on-line.Circuit of the present invention includes signal end, noise end, difference noise abatement pre-amplification circuit, signal amplification circuit, the first biasing circuit, the second biasing circuit, output terminal, the difference noise abatement pre-amplification circuit carries out difference noise abatement processing to input signal and noise signal using the differential amplifier circuit of high symmetry and signal amplifies, the noise end is placed at 5~10m around monitored equipment again, ambient noise is made maximumlly to filter out;The signal amplification circuit uses the design of two-stage amplification, and the signal amplification factor of the first order is 102~104, the signal amplification factor of the second level is 103~106, and filter is equipped in circuit, it is ensured that noise signal is preferably minimized while desired signal is amplified, and the Weak absorption precision of the present invention is up to A grades even nA grades of μ.

Description

A kind of superelevation frequency weak signal combined amplifier
Technical field
The invention belongs to power equipment high-frequency local dischargings to monitor field, more particularly to a kind of faint letter of hyperfrequency on-line Number combined amplifier.
Background technology
Major Utilities Electric Co. of China is being changed the maintenance mode of power equipment from periodic inspection to repair based on condition of component at present, The operating status of power equipment is promptly and accurately grasped, it is primary work that on-line monitoring is carried out to equipment.By to equipment carry out office Portion's On-line Discharge Detection can quickly grasp Electric Power Equipment Insulation state in time, reduce the blindness of maintenance of equipment experiment.Hyperfrequency The Observational frequency band of detection method is generally 300MHz~3GHz, the corona discharge in power equipment use site ambient noise and air Frequency band is in 300MHz hereinafter, can effectively to evade corona, switching manipulation that traditional Partial Discharge Detection means are faced etc. a variety of Electrical Interference, and detection bandwidth, high sensitivity, the operation is stable of ultra-high-frequency detection method, therefore obtained in recent years fast The development and application of speed.
The main problem that hyperfrequency weak signal amplification circuit of the prior art is faced on Weak absorption is just It is that measurement accuracy is inadequate, even if can be measured that mA grades of electric current or the high precision of other same magnitude physical quantity comparisons, and And antijamming capability is weaker, reliability is relatively low.Therefore, the combination it is urgent to provide a kind of high certainty of measurement, strong antijamming capability is put Big circuit.
Invention content
The present invention in order to overcome the above-mentioned deficiencies of the prior art, provides a kind of superelevation frequency weak signal combined amplifier electricity Road, Weak absorption precision of the invention up to A grades even nA grades of μ, and the present invention be also equipped with strong antijamming capability, can By property it is high, can be mass the characteristics of.
To achieve the above object, present invention employs following technical measures:
A kind of superelevation frequency weak signal combined amplifier, this combined amplifier subtract including signal end, noise end, difference It makes an uproar pre-amplification circuit, signal amplification circuit, the first biasing circuit, the second biasing circuit, output terminal, wherein,
Signal end, noise end are respectively used to introduce signal source, the noise source of monitored equipment, the signal end, noise end Signal output end be all connected with the signal input part of difference noise abatement pre-amplification circuit;
Difference noise abatement pre-amplification circuit is believed for receiving respectively from signal end, the input signal at noise end, noise Number, and difference noise abatement processing and signal amplification, the difference noise abatement pre-amplification circuit are carried out to input signal and noise signal Signal output end connection signal amplifying circuit signal input part;
Signal amplification circuit, for being carried out at signal amplification to the input signal for coming from difference noise abatement pre-amplification circuit Reason, the signal output end output of the signal amplification circuit output signal to output terminal convenient for monitoring;
First biasing circuit, the second biasing circuit are respectively used to as the difference noise abatement pre-amplification circuit, signal amplification Circuit provide normal operating conditions voltage, first biasing circuit, the second biasing circuit signal output end connect difference respectively Divide the signal input part of noise abatement pre-amplification circuit, signal amplification circuit.
Preferably, the difference noise abatement pre-amplification circuit includes the first operational amplifier and second operational amplifier, institute State the negative signal input terminal connection input signal of the first operational amplifier, one end of the first capacitance and first resistor, first The positive signal input terminal of operational amplifier connects the first port of the first biasing circuit, the signal of first operational amplifier Output terminal connects the first capacitance, the other end of first resistor and one end of the second capacitance, the other end connection of second capacitance One end of second resistance and the positive signal input terminal of third operational amplifier, the other end ground connection of the second resistance, institute The negative signal input terminal for stating third operational amplifier connects the second port of the first biasing circuit, the letter of third operational amplifier Number output terminal connects the third port of the first biasing circuit and the positive signal input terminal of the 5th differential amplifier, and the described 5th is poor The signal input part of the signal output end connection signal amplifying circuit of dynamic amplifier;
Negative signal input terminal connection noise signal, third capacitance and the 7th resistance of the second operational amplifier One end, the positive signal input terminal of second operational amplifier connects the 4th port of the first biasing circuit, second operation Signal output end connection third capacitance, the other end of the 7th resistance and one end of the 4th capacitance of amplifier, the 4th capacitance The other end connect the 8th resistance one end and four-operational amplifier positive signal input terminal, the 8th resistance it is another One end is grounded, and the negative signal input terminal of the four-operational amplifier connects the fifth port of the first biasing circuit, the 4th fortune The signal output end for calculating amplifier connects the 6th port of the first biasing circuit and the negative signal input of the 5th differential amplifier End.
Preferably, the signal amplification circuit includes the 6th operational amplifier and the 7th operational amplifier, the 6th fortune The negative signal input terminal for calculating amplifier connects one end of the 13rd resistance, the 14th resistance, the 5th capacitance, the 13rd electricity The other end of resistance connects the signal output end of the 5th differential amplifier, and the positive signal input terminal of the 6th operational amplifier connects The first port of the second biasing circuit is connect, the signal output end of the 6th operational amplifier connects the 5th capacitance, the 14th electricity One end of the other end of resistance and the 15th resistance, the other end of the 15th resistance connect the anode letter of the 7th operational amplifier Number input terminal, the negative signal input terminal of the 7th operational amplifier connect one end of the tenth capacitance, the 7th operational amplifier Signal output end connect the tenth capacitance the other end and the 19th resistance one end, the 19th resistance it is another The output signal of monitoring is convenient in the second port of the second biasing circuit of end connection, the signal output end output of the 7th operational amplifier To output terminal;
The negative electricity source of 6th operational amplifier connects the cathode of the first power supply and one end of the 6th capacitance, described The anode of cathode power supply end connection second source of 7th operational amplifier and one end of the 7th capacitance, first power supply is just Pole, the other end of the 6th capacitance, the cathode of second source, the 7th capacitance the other end be grounded;6th operational amplifier Cathode power supply end connection third power supply anode and the 8th capacitance one end, the negative electricity source of the 7th operational amplifier Connect the cathode of the 4th power supply and one end of the 9th capacitance, the cathode of the third power supply, the other end of the 8th capacitance, the 4th electricity The anode in source, the 9th capacitance the other end be grounded.
Preferably, first biasing circuit includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th adjustable resistance, the Nine resistance, the tenth resistance, the 11st resistance, the 12nd adjustable resistance, the 3rd resistor one end ground connection, 3rd resistor it is another One end connect the first operational amplifier positive signal input terminal and the 4th resistance one end, the 4th resistance it is another The anode of the first bias supply of end connection, one end of the 5th resistance, the cathode ground connection of first bias supply, the 5th electricity The negative signal input terminal of other end connection third operational amplifier of resistance and one end of the 6th adjustable resistance, the described 6th The signal output end of the other end connection third operational amplifier of adjustable resistance and the positive signal of the 5th differential amplifier are defeated Enter end;
One end ground connection of 9th resistance, the positive signal of the other end connection second operational amplifier of the 9th resistance are defeated Enter end and one end of the tenth resistance, the other end of the tenth resistance connects anode, the 11st resistance of the second bias supply One end, the cathode ground connection of second bias supply, the other end connection four-operational amplifier of the 11st resistance One end of negative signal input terminal and the 12nd adjustable resistance, the 4th fortune of other end connection of the 12nd adjustable resistance Calculate the signal output end of amplifier and the negative signal input terminal of the 5th differential amplifier.
Preferably, second biasing circuit include the 16th resistance, the 17th resistance, the 18th resistance, the described tenth One end ground connection of six resistance, the other end of the 16th resistance connect positive signal input terminal, the Yi Ji of the 6th operational amplifier One end of 17 resistance, the anode of the other end connection third bias supply of the 17th resistance, one end of the 18th resistance, The cathode ground connection of the third bias supply, the other end of the 18th resistance connect the other end of the 19th resistance.
Further, first operational amplifier, second operational amplifier, third operational amplifier, the 4th operation are put Big device, the 6th operational amplifier, the 7th operational amplifier model be the OPA627 operational amplifiers of American TI Company production, The INA129 differential amplifiers of the model American TI Company production of 5th differential amplifier.
Further, all components in the difference noise abatement pre-amplification circuit, signal amplification circuit are detachable Ground is fixed in supporting plate, and the supporting plate is nested in insulated support.
Further, this combined amplifier is sealed in metal shielding box.
Further, the noise end is placed at 5~10m around monitored equipment.
Further, the signal amplification factor of the difference noise abatement pre-amplification circuit is 101~102Times, the signal is put The signal amplification factor of big circuit is 105~1010Times.
The beneficial effects of the present invention are:
1), circuit of the present invention includes signal end, noise end, difference noise abatement pre-amplification circuit, signal amplification circuit, first Biasing circuit, the second biasing circuit, output terminal, the difference noise abatement pre-amplification circuit are electric using the differential amplification of high symmetry Road carries out difference noise abatement processing to input signal and noise signal and signal amplifies, and the noise end is placed in distance and is monitored Around equipment at 5~10m, ambient noise is made maximumlly to filter out;The signal amplification circuit uses the design of two-stage amplification, the The signal amplification factor of level-one is 102~104, the signal amplification factor of the second level is 103~106, and filtering dress is equipped in circuit It puts, it is ensured that be preferably minimized noise signal while desired signal is amplified, and the Weak absorption precision of the present invention can Up to A grades even nA grades of μ.
2) traditional integrated plated circuit, has been abandoned, difference noise abatement pre-amplification circuit, signal amplification in the present invention All components in circuit are detachably secured in supporting plate, and the supporting plate is nested in insulated support, effectively Ground improves the safety and reliability of entire combined amplifier, and the present invention is interfered in the presence of a harsh environment by extraneous factor The phenomenon that being not susceptible to damage, the present invention are also convenient for installing and dismounting and the maintenance of component, greatly reduce combined amplifier electricity Error caused by interfering with each other between each element in road increases the precision of signal transmission;Using direct between element Conducting wire welding connection, and this combined amplifier is sealed in metal shielding box, greatly shields the interference of outer signals.
3), the 6th operational amplifier in the signal amplification circuit, also fallen between the 7th operational amplifier by polarity Connection is put, error caused by drift voltage is preferably minimized, the monitoring finally obtained waveform is made to be more prone to identify;The difference The 6th adjustable resistance, the 12nd adjustable resistance set in noise abatement pre-amplification circuit, can be according to operational amplifier to biasing The size needed to adjust resistance at any time of voltage, facilitates adjustment of this combined amplifier to signal times magnification.
Description of the drawings
Fig. 1 is the principle of the present invention block diagram;
Fig. 2 is the circuit diagram of the difference noise abatement pre-amplification circuit of the present invention, the first biasing circuit;
Fig. 3 is the circuit diagram of the signal amplification circuit of the present invention, the second biasing circuit.
Reference numeral meaning in figure is as follows:
10-difference noise abatement 20-signal amplification circuit of pre-amplification circuit
30-the first the 40-the second biasing circuit of biasing circuit
The operational amplifier of operational amplifiers of AMP1~AMP7-first~the 7th
The capacitance of capacitances of C1~C10-first~the tenth
The resistance of R1~R5-first resistor~the 5th
The resistance of R7~R11-first resistor~the 11st
The resistance of R13~R19-first resistor~the 19th
The adjustable resistances of adjustable resistance R12-the 12nd of R6-the 6th
The power supply of power supplys of VCC1~VCC4-first~the 4th
Vf1~Vf3-the first bias supply~third bias supply
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, this combined amplifier includes signal end, noise end, difference noise abatement pre-amplification circuit 10, signal Amplifying circuit 20, the first biasing circuit 30, the second biasing circuit 40, output terminal, the signal end, noise end are respectively used to introduce Signal source, the noise source of monitored equipment, the signal end, noise end signal output end be all connected with the preposition amplification of difference noise abatement The signal input part of circuit 10, the signal output end connection signal amplifying circuit 20 of the difference noise abatement pre-amplification circuit 10 Signal input part, first biasing circuit 30, the second biasing circuit 40 signal output end to connect difference noise abatement respectively preposition The signal input part of amplifying circuit 10, signal amplification circuit 20, the signal output end output of the signal amplification circuit 20 are convenient for Monitoring outputs signal to output terminal.
As shown in Fig. 2, the difference noise abatement pre-amplification circuit 10 includes the first operational amplifier A MP1 and the second operation Amplifier AMP2, the first operational amplifier A MP1 negative signal input terminal connection input signal, the first capacitance C1 and One end of first resistor R1, the positive signal input terminal of the first operational amplifier A MP1 connect the first end of the first biasing circuit 30 Mouthful, the signal output end of the first operational amplifier A MP1 connects the other end and second of the first capacitance C1, first resistor R1 One end of capacitance C2, one end of other end connection second resistance R2 of the second capacitance C2 and third operational amplifier A MP3 Positive signal input terminal, the second resistance R2 the other end ground connection, the negative signal of the third operational amplifier A MP3 Input terminal connects the second port of the first biasing circuit 30, the first biasing of signal output end connection of third operational amplifier A MP3 The positive signal input terminal of the third port of circuit 30 and the 5th differential amplifier A MP5, the 5th differential amplifier A MP5's The signal input part of signal output end connection signal amplifying circuit 20;
The negative signal input terminal connection noise signal of the second operational amplifier AMP2, third capacitance C3, Yi Ji One end of seven resistance R7, the positive signal input terminal of second operational amplifier AMP2 connect the 4th end of the first biasing circuit 30 Mouthful, the signal output end connection third capacitance C3 of the second operational amplifier AMP2, the other end and the 4th of the 7th resistance R7 One end of capacitance C4, other end connection one end of the 8th resistance R8 of the 4th capacitance C4 and four-operational amplifier AMP4 Positive signal input terminal, the 8th resistance R8 the other end ground connection, the negative signal of the four-operational amplifier AMP4 Input terminal connects the fifth port of the first biasing circuit 30, the first biasing of signal output end connection of four-operational amplifier AMP4 6th port of circuit 30 and the negative signal input terminal of the 5th differential amplifier A MP5.
As shown in Fig. 2, first biasing circuit 30 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th Adjustable resistance R6, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd adjustable resistance R12, the third electricity Hinder one end ground connection of R3, the other end of 3rd resistor R3 connect the first operational amplifier A MP1 positive signal input terminal and One end of 4th resistance R4, the other end of the 4th resistance R4 connect the anode of the first bias supply Vf1, the 5th resistance R5 One end, the cathode ground connection of the first bias supply Vf1, the other end connection third operational amplifier of the 5th resistance R5 The negative signal input terminal of AMP3 and one end of the 6th adjustable resistance R6, the other end connection of the 6th adjustable resistance R6 The signal output end of third operational amplifier A MP3 and the positive signal input terminal of the 5th differential amplifier A MP5;
One end ground connection of the 9th resistance R9, the other end connection second operational amplifier AMP2 of the 9th resistance R9 is just One end of pole signal input part and the tenth resistance R10, the other end of the tenth resistance R10 connect the second bias supply Vf2 Anode, the 11st resistance R11 one end, the second bias supply Vf2 cathode ground connection, the 11st resistance R11's The negative signal input terminal of other end connection four-operational amplifier AMP4 and one end of the 12nd adjustable resistance R12, it is described The signal output end of the other end connection four-operational amplifier AMP4 of 12nd adjustable resistance R12 and the 5th differential amplification The negative signal input terminal of device AMP5.
As shown in figure 3, the signal amplification circuit 20 includes the 6th operational amplifier A MP6 and the 7th operational amplifier The negative signal input terminal of AMP7, the 6th operational amplifier A MP6 connects the 13rd resistance R13, the 14th resistance R14, the One end of five capacitance C5, the other end of the 13rd resistance R13 connect the signal output end of the 5th differential amplifier A MP5, institute The positive signal input terminal for stating the 6th operational amplifier A MP6 connects the first port of the second biasing circuit 40, the 6th operation The signal output end of amplifier AMP6 connects the one of the 5th capacitance C5, the other end of the 14th resistance R14 and the 15th resistance R15 End, the other end of the 15th resistance R15 connect the positive signal input terminal of the 7th operational amplifier A MP7, the 7th fortune The negative signal input terminal for calculating amplifier AMP7 connects one end of the tenth capacitance C10, and the signal of the 7th operational amplifier A MP7 is defeated Outlet connects the other end of the tenth capacitance C10 and one end of the 19th resistance R19, and the 19th resistance R19's is another One end connects the second port of the second biasing circuit 40, and the signal output end output of the 7th operational amplifier A MP7 is convenient for monitoring Output signal to output terminal;
The negative electricity source of the 6th operational amplifier A MP6 connects the cathode and the 6th capacitance C6 of the first power supply VCC1 One end, the anode of the cathode power supply end connection second source VCC2 of the 7th operational amplifier A MP7 and the 7th capacitance C7's One end, anode, the other end of the 6th capacitance C6, the cathode of second source VCC2, the 7th capacitance C7 of the first power supply VCC1 The other end be grounded;The anode and the 8th of the cathode power supply end connection third power supply VCC3 of the 6th operational amplifier A MP6 One end of capacitance C8, the negative electricity source of the 7th operational amplifier A MP7 connect the cathode and the 9th electricity of the 4th power supply VCC4 Hold one end of C9, the cathode of the third power supply VCC3, the other end of the 8th capacitance C8, the anode of the 4th power supply VCC4, the 9th The other end of capacitance C9 is grounded.
As shown in figure 3, second biasing circuit 40 includes the 16th resistance R16, the 17th resistance R17, the 18th electricity R18, one end ground connection of the 16th resistance R16 are hindered, the other end of the 16th resistance R16 connects the 6th operational amplifier A MP6 Positive signal input terminal and the 17th resistance R17 one end, the 17th resistance R17 the other end connection third it is inclined The anode of power supply Vf3, one end of the 18th resistance R18 are put, the cathode of the third bias supply Vf3 is grounded, and the described 18th The other end of resistance R18 connects the other end of the 19th resistance R19.
Detailed description below the preferred embodiment of the present invention, as shown in Fig. 2, choosing second resistance R2, the 8th resistance R8 Resistance value size be R2=R8=1k Ω, the second capacitance C2, the 4th capacitance C4 capacitance size be C2=C4= 0.53052pF is used to implement preliminary high-pass filtering, and the harmonic wave and ambient noise that will be less than 300MHz filter out;Choose first resistor R1, the 7th resistance R7 resistance value size for R1=R7=100 Ω, the first capacitance C1, third capacitance C3 capacitance size be C1=C3=1.592pF is used to implement low-pass filtering, and the harmonic wave more than 1GHz and other noises are further filtered out;Low pass filtered Wave and the cutoff frequency of high-pass filtering are by formulaIt determines;
The first operational amplifier A MP1, second operational amplifier AMP2, third operational amplifier A MP3, the 4th operation The model of amplifier AMP4 is using the OPA627 operational amplifiers of American TI Company production.
Using two bias supplies, respectively the first bias supply Vf1, the second bias supply in the first biasing circuit 30 Vf2, the first bias supply Vf1 pass through divider resistance 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th adjustable Resistance R6 provides the first operational amplifier A MP1, third operational amplifier A MP3 the bias voltage of steady-working state;It is described Second bias supply Vf2 passes through the 9th resistance R9 of divider resistance, the tenth resistance R10, the 11st resistance R11, the 12nd adjustable electric Hinder the bias voltage that R12 provides second operational amplifier AMP2, four-operational amplifier AMP4 steady-working state;In order to carry The normal work of circuit is not influenced while for bias voltage, adjust the size of divider resistance influences to eliminate by bias voltage, tool Body is analyzed as follows:
By superposition theorem, measured signal gain amplifier and bias voltage gain amplifier are analyzed respectively, with differential electrical For the lower half portion on road, as shown in Fig. 2, the gain amplifier of signal is as follows,
ByV can be releasedo1=IinR7
Therefore, Vb=Vo1, again,
It can release
Bias voltage gain amplifier is as follows,
It can release
It follows that
It can to sum up obtain, the global voltage output function of the lower half portion of difference channel is:
Work as R5R7-R6R8When=0, the gain of bias voltage can be eliminated, this example can use R5=R6=R7=R8, it is poor to obtain The gain divided before amplification is 200 times.
The INA129 differential amplifiers of the model American TI Company production of the 5th differential amplifier A MP5 of afterbody, Amplification factor is by the amplification resistance R inside the 5th differential amplifier A MP5GIt determines, this example RG49.4k Ω are chosen, then this example The amplification factor of the difference noise abatement pre-amplification circuit of middle first part is 4 × 102
The signal amplification circuit 20 is made of 2 grades of amplifying circuits, and two-stage is scaling circuit, but gain size Different, prime amplification factor is smaller convenient for error caused by noise is reduced as far as possible, and prime amplification factor generally exists 10~103Between, rear class amplification factor is generally 104~105Between, while pass through the 5th capacitance C5 of feedback capacity, the tenth capacitance C10 adjusts filter range and reduces self-excitation, the first power supply VCC1 in the signal amplification circuit 20 and second source VCC2, It is also connected between third power supply VCC3 and the 4th power supply VCC4 by polarity inversion, error caused by drift voltage is dropped to most It is low so that the monitoring waveform finally obtained is more prone to identify.In this example, the times magnification of the 6th operational amplifier A MP6 is chosen Number is 102Times, the amplification factor of the 6th operational amplifier A MP6 is 104Times, the whole amplification factor of the signal amplification circuit 20 It is 106Times, with reference to difference noise abatement pre-amplification circuit 10, signal amplification factor of the invention is 4 × 108Times.

Claims (10)

1. a kind of superelevation frequency weak signal combined amplifier, it is characterised in that:This combined amplifier includes signal end, noise End, difference noise abatement pre-amplification circuit (10), signal amplification circuit (20), the first biasing circuit (30), the second biasing circuit (40), output terminal, wherein,
Signal end is used to introduce the signal source of monitored equipment, and noise end is used to introduce the noise source of monitored equipment, the letter Number end, noise end signal output end be all connected with the signal input part of difference noise abatement pre-amplification circuit (10);
Difference noise abatement pre-amplification circuit (10) is believed for receiving respectively from signal end, the input signal at noise end, noise Number, and difference noise abatement processing and signal amplification, the difference noise abatement pre-amplification circuit are carried out to input signal and noise signal (10) signal input part of signal output end connection signal amplifying circuit (20);
Signal amplification circuit (20) is put for carrying out signal to the input signal for coming from difference noise abatement pre-amplification circuit (10) Big processing, the signal output end output of the signal amplification circuit (20) output signal to output terminal convenient for monitoring;
First biasing circuit (30), the second biasing circuit (40), be respectively used to for the difference noise abatement pre-amplification circuit (10), Signal amplification circuit (20) provides normal operating conditions voltage, first biasing circuit (30), the second biasing circuit (40) Signal output end connects the signal input part of difference noise abatement pre-amplification circuit (10), signal amplification circuit (20) respectively.
2. a kind of superelevation frequency weak signal combined amplifier as described in claim 1, it is characterised in that:The difference noise abatement Pre-amplification circuit (10) includes the first operational amplifier (AMP1) and second operational amplifier (AMP2), and first operation is put The negative signal input terminal of big device (AMP1) connects one end of input signal, the first capacitance (C1) and first resistor (R1), the The positive signal input terminal of one operational amplifier (AMP1) connects the first port of the first biasing circuit (30), first operation The signal output end of amplifier (AMP1) connects the first capacitance (C1), the other end of first resistor (R1) and the second capacitance (C2) One end, one end of other end connection second resistance (R2) of second capacitance (C2) and third operational amplifier (AMP3) Positive signal input terminal, the other end ground connection of the second resistance (R2), the cathode letter of the third operational amplifier (AMP3) Number input terminal connects the second port of the first biasing circuit (30), the signal output end connection of third operational amplifier (AMP3) the The positive signal input terminal of the third port of one biasing circuit (30) and the 5th differential amplifier (AMP5), the described 5th differential puts The signal input part of the signal output end connection signal amplifying circuit (20) of big device (AMP5);
The negative signal input terminal connection noise signal of the second operational amplifier (AMP2), third capacitance (C3), Yi Ji One end of seven resistance (R7), the positive signal input terminal of second operational amplifier (AMP2) connect the of the first biasing circuit (30) Four ports, the second operational amplifier (AMP2) signal output end connection third capacitance (C3), the 7th resistance (R7) it is another One end and one end of the 4th capacitance (C4), the other end of the 4th capacitance (C4) connect one end and the of the 8th resistance (R8) The positive signal input terminal of four-operational amplifier (AMP4), the other end ground connection of the 8th resistance (R8), the 4th operation The negative signal input terminal of amplifier (AMP4) connects the fifth port of the first biasing circuit (30), four-operational amplifier (AMP4) signal output end connects the 6th port of the first biasing circuit (30) and the cathode of the 5th differential amplifier (AMP5) Signal input part.
3. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 2, it is characterised in that:The signal amplification Circuit (20) includes the 6th operational amplifier (AMP6) and the 7th operational amplifier (AMP7), the 6th operational amplifier (AMP6) negative signal input terminal connects one end of the 13rd resistance (R13), the 14th resistance (R14), the 5th capacitance (C5), The other end of 13rd resistance (R13) connects the signal output end of the 5th differential amplifier (AMP5), the 6th operation The positive signal input terminal of amplifier (AMP6) connects the first port of the second biasing circuit (40), the 6th operational amplifier (AMP6) signal output end connects the 5th capacitance (C5), the other end of the 14th resistance (R14) and the 15th resistance (R15) One end, the other end of the 15th resistance (R15) connects the positive signal input terminal of the 7th operational amplifier (AMP7), described The negative signal input terminal of 7th operational amplifier (AMP7) connects one end of the tenth capacitance (C10), the 7th operational amplifier (AMP7) signal output end connects the other end of the tenth capacitance (C10) and one end of the 19th resistance (R19), and described the The other end of 19 resistance (R19) connects the second port of the second biasing circuit (40), the 7th operational amplifier (AMP7) Signal output end output outputs signal to output terminal convenient for monitoring;
The negative electricity source of 6th operational amplifier (AMP6) connects the cathode and the 6th capacitance of the first power supply (VCC1) (C6) one end, the anode and the 7th of the cathode power supply end connection second source (VCC2) of the 7th operational amplifier (AMP7) One end of capacitance (C7), the anode of first power supply (VCC1), the other end of the 6th capacitance (C6), second source (VCC2) Cathode, the 7th capacitance (C7) the other end be grounded;The cathode power supply end connection third of 6th operational amplifier (AMP6) One end of the anode of power supply (VCC3) and the 8th capacitance (C8), the negative electricity source connection of the 7th operational amplifier (AMP7) The cathode of 4th power supply (VCC4) and one end of the 9th capacitance (C9), cathode, the 8th capacitance of the third power supply (VCC3) (C8) the other end, the anode of the 4th power supply (VCC4), the other end of the 9th capacitance (C9) is grounded.
4. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 2, it is characterised in that:First biasing Circuit (30) includes 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th adjustable resistance (R6), the 9th resistance (R9), the tenth resistance (R10), the 11st resistance (R11), the 12nd adjustable resistance (R12), one end of the 3rd resistor (R3) Ground connection, the other end of 3rd resistor (R3) connect the positive signal input terminal and the 4th electricity of the first operational amplifier (AMP1) The one end of (R4) is hindered, the other end of the 4th resistance (R4) connects anode, the 5th resistance (R5) of the first bias supply (Vf1) One end, first bias supply (Vf1) cathode ground connection, the 5th resistance (R5) the other end connection third operation put The big negative signal input terminal of device (AMP3) and one end of the 6th adjustable resistance (R6), the 6th adjustable resistance (R6) The signal output end of other end connection third operational amplifier (AMP3) and the positive signal of the 5th differential amplifier (AMP5) Input terminal;
One end ground connection of 9th resistance (R9), the other end connection second operational amplifier (AMP2) of the 9th resistance (R9) One end of positive signal input terminal and the tenth resistance (R10), the second biasing of other end connection of the tenth resistance (R10) One end of the anode of power supply (Vf2), the 11st resistance (R11), the cathode ground connection of second bias supply (Vf2), described the The negative signal input terminal of the other end connection four-operational amplifier (AMP4) of 11 resistance (R11) and the 12nd adjustable One end of resistance (R12), the signal of the other end connection four-operational amplifier (AMP4) of the 12nd adjustable resistance (R12) The negative signal input terminal of output terminal and the 5th differential amplifier (AMP5).
5. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 3, it is characterised in that:Second biasing Circuit (40) includes the 16th resistance (R16), the 17th resistance (R17), the 18th resistance (R18), the 16th resistance (R16) one end ground connection, the other end of the 16th resistance (R16) connect the positive signal input of the 6th operational amplifier (AMP6) End and one end of the 17th resistance (R17), the other end connection third bias supply (Vf3) of the 17th resistance (R17) Anode, the 18th resistance (R18) one end, the third bias supply (Vf3) cathode ground connection, the 18th resistance (R18) the other end connects the other end of the 19th resistance (R19).
6. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 3, it is characterised in that:First operation Amplifier (AMP1), second operational amplifier (AMP2), third operational amplifier (AMP3), four-operational amplifier (AMP4), 6th operational amplifier (AMP6), the 7th operational amplifier (AMP7) model be American TI Company production OPA627 operations Amplifier, the INA129 differential amplifiers of the model American TI Company production of the 5th differential amplifier (AMP5).
7. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 3, it is characterised in that:The difference noise abatement All components in pre-amplification circuit (10), signal amplification circuit (20) are detachably secured in supporting plate, described Supporting plate is nested in insulated support.
8. a kind of superelevation frequency weak signal combined amplifier as claimed in claim 7, it is characterised in that:This combined amplifier electricity Road is sealed in metal shielding box.
9. a kind of superelevation frequency weak signal combined amplifier as described in claim 1, it is characterised in that:It puts at the noise end In around monitored equipment at 5~10m.
10. a kind of superelevation frequency weak signal combined amplifier as described in claim 1, it is characterised in that:The difference subtracts Make an uproar pre-amplification circuit (10) signal amplification factor be 101~102Times, the signal times magnification of the signal amplification circuit (20) Number is 105~1010Times.
CN201610078155.6A 2016-02-02 2016-02-02 A kind of superelevation frequency weak signal combined amplifier Active CN105763163B (en)

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CN109150123A (en) * 2018-09-28 2019-01-04 佛山市顺德区中山大学研究院 A kind of small-signal pre-amplification circuit of high-gain
CN110879087A (en) * 2019-12-30 2020-03-13 江苏特建技术股份有限公司 Operation and maintenance management equipment fault detection system
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