CN104038161A - Module for amplifying signals in gas concentration detection system of transformer substation - Google Patents
Module for amplifying signals in gas concentration detection system of transformer substation Download PDFInfo
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- CN104038161A CN104038161A CN201410274754.6A CN201410274754A CN104038161A CN 104038161 A CN104038161 A CN 104038161A CN 201410274754 A CN201410274754 A CN 201410274754A CN 104038161 A CN104038161 A CN 104038161A
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Abstract
The invention discloses a module for amplifying signals in a gas concentration detection system of a transformer substation. The module comprises an amplifying circuit, a band-pass filtering circuit and an amplified signal output line, the amplifying circuit comprises a first amplifier, the band-pass filtering circuit comprises a second amplifier, a third resistor, a fourth resistor, a seventh capacitor and an eighth capacitor, two ends of the third resistor are connected with an output end of the first amplifier and the eighth capacitor respectively, the other end, opposite to the end connected with the third resistor, of the eighth capacitor is connected with a same-phase input end of the second amplifier, one end of the fourth resistor is connected on a line between the third resistor and the eighth capacitor while the other end of the same is connected with a reverse-phase input end of the second amplifier, one end of the seventh capacitor is connected on a line between the third resistor and the eighth capacitor while the other end of the same is grounded, and the amplified signal output line is connected with an output end of the second amplifier. When the module is applied, by amplifying and then filtering detection signals, accurate displaying of the detection signals can be guaranteed, so that potential safety hazards are eliminated.
Description
Technical field
the present invention relates to substation safety protection field, the module of specifically amplifying signal in transformer station's gas concentration detection system.
Background technology
transformer station is for a long time in closed state, and in it, air, in first valve state, easily deposits the high gas of a large amount of molecular weight in transformer station, therefore, carries out regularly detecting particularly important to gas concentration in transformer station.In order to detect gas concentration in transformer station, design now a kind of transformer station gas concentration detection system, it comprises transducer, D.C. regulated power supply, analog to digital conversion circuit and digital display circuit, when this detection system application, be whole system power supply by D.C. regulated power supply, transducer converts the gas concentration signal detecting to voltage signal, and shows gas concentration value by digital display circuit after analog to digital conversion circuit conversion.Wherein, the weak output signal that when this system applies, transducer detects, in transmitting procedure, can there is attenuation and absorption in signal, and digital display circuit can accurately not reflect gas concentration in transformer station, so, can cause misleading and have potential safety hazard operating personnel.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of can amplify sensor detection signal, to intuitively show the module of signal in the amplification transformer station gas concentration detection system of gas concentration in transformer station.
The present invention addresses the above problem and is achieved through the following technical solutions: the module of amplifying signal in transformer station's gas concentration detection system, comprise amplifying circuit, bandwidth-limited circuit and amplifying signal outlet line, described amplifying circuit comprises the first amplifier, described bandwidth-limited circuit comprises the second amplifier, the 3rd resistance, the 4th resistance, the 7th electric capacity and the 8th electric capacity, described the 3rd resistance two ends are connected with the first amplifier out and the 8th electric capacity respectively, the other end that the 8th electric capacity connects the 3rd resistance terminal is relatively connected with the in-phase input end of the second amplifier, the 4th resistance one end is connected on the circuit between the 3rd resistance and the 8th electric capacity, its other end is connected with the inverting input of the second amplifier, described the 7th electric capacity one end is connected on the circuit between the 3rd resistance and the 8th electric capacity, its other end ground connection, described amplifying signal outlet line is connected with the output of the second amplifier.When the present invention applies, the signal that transducer detects is inputted by in-phase input end and the inverting input of the first amplifier, after the first amplifier amplifies, carries out filtering by bandwidth-limited circuit, then exports through amplifying signal outlet line.
Because AD620 is that it has the feature of low skew, high-gain, high conjugated analoging systeming ratio by three difference instrumentation amplifiers that accurate amplifier is integrated, further, described the first amplifier adopts AD620 chip.
Further, described amplifying circuit also comprises the first adjustable resistance, and the two ends of the first adjustable resistance are connected with the first pin and the 8th pin of the first amplifier respectively.
In order to prevent that power end noise coupling from entering in the first amplifier, further, described amplifying circuit also comprises the first magnetic bead, the second magnetic bead, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, described the first magnetic bead two ends connect respectively the 7th pin of positive source and the first amplifier, parallel branch one end that described the 3rd electric capacity and the 4th Capacitance parallel connection form is connected on the circuit between the first magnetic bead and the first amplifier, its other end ground connection; Described the second magnetic bead two ends connect respectively the 4th pin of power cathode and the first amplifier, and parallel branch one end that described the 5th electric capacity and the 6th Capacitance parallel connection form is connected on the circuit between the second magnetic bead and the first amplifier, its other end ground connection.So, time of the present invention, the each energization pins of the first amplifier is connected to two electric capacity with ground, and carries out power decoupling by a magnetic bead series connection.
Further, described bandwidth-limited circuit also comprises the 5th resistance and the 6th resistance, described the 5th resistance and the 6th resistance homogeneous end ground connection, the 5th resistance relatively other end of its earth terminal is connected on the circuit between the 8th electric capacity and the second amplifier in-phase input end, and the 6th resistance relatively other end of its earth terminal is connected on the circuit between the 4th resistance and the second amplifier inverting input.
Because OP777 chip is a ultraprecise low noise amplifier, there is extremely low voltage and current skew and very high gain stability, further, described the second amplifier adopts OP777 chip.
Further, described amplifying circuit also comprises the first electric capacity, the second electric capacity, the first resistance and the second resistance, described first electric capacity one end is connected with the inverting input of the first amplifier, second electric capacity one end is connected with the in-phase input end of the first amplifier, the first resistance and the second resistance homogeneous end ground connection, the the first resistance relatively other end of its earth terminal is connected on the circuit between the first electric capacity and the first amplifier inverting input, and the second resistance relatively other end of its earth terminal is connected on the circuit between the second electric capacity and the first amplifier in-phase input end.So, when applying, the present invention carries out AC coupled input by the first electric capacity and the second electric capacity, the first electric capacity and the first resistance composition high pass filter, the second electric capacity and the second resistance composition high pass filter, the high pass filter that the present invention consists of the first electric capacity, the second electric capacity, the first resistance and the second resistance is to reduce the low-frequency disturbance in environment.
In sum, the present invention has following beneficial effect: (1) the present invention includes amplifying circuit, bandwidth-limited circuit and amplifying signal outlet line, wherein, amplifying circuit comprises the first amplifier, bandwidth-limited circuit comprises the second amplifier, the 3rd resistance, the 4th resistance, the 7th electric capacity and the 8th electric capacity, the 3rd resistance two ends are connected with the first amplifier out and the 8th electric capacity respectively, the other end that the 8th electric capacity connects the 3rd resistance terminal is relatively connected with the in-phase input end of the second amplifier, the 4th resistance one end is connected on the circuit between the 3rd resistance and the 8th electric capacity, its other end is connected with the inverting input of the second amplifier, the 7th electric capacity one end is connected on the circuit between the 3rd resistance and the 8th electric capacity, its other end ground connection, amplifying signal outlet line is connected with the output of the second amplifier, the present invention adopts said structure, overall structure is simple, be convenient to realize, when the present invention applies, sensor detection signal is inputted and is amplified by the first amplifier, again by exporting after bandwidth-limited circuit filtering, sensor detection signal can ensure that digital display circuit reflects gas concentration in transformer station accurately after amplifying, so, can eliminate and detect not accurate existing potential safety hazard.
(2) when amplifying signal of the present invention is exported, carry out filtering through bandwidth-limited circuit, the noise that in bandwidth-limited circuit energy filtering circuit, element produces, so, can ensure that output signal has sufficiently high precision.
Brief description of the drawings
The structural representation of a specific embodiment of Fig. 1 the present invention.
In accompanying drawing, the corresponding name of Reference numeral is called: R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, R4, the 4th resistance, R5, the 5th resistance, R6, the 6th resistance, RW1, the first adjustable resistance, C1, the first electric capacity, C2, the second electric capacity, C3, the 3rd electric capacity, C4, the 4th electric capacity, C5, the 5th electric capacity, C6, the 6th electric capacity, C7, the 7th electric capacity, C8, the 8th electric capacity, A1, the first amplifier, A2, the second amplifier, L1, the first magnetic bead, L2, the second magnetic bead.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to detailed description further, but embodiments of the present invention are not limited to this.
Embodiment:
As shown in Figure 1, amplify the module of signal in transformer station's gas concentration detection system, comprise amplifying circuit, bandwidth-limited circuit and amplifying signal outlet line, wherein, amplifying circuit comprises the first amplifier A1, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the first resistance R 1, the second resistance R 2, the first magnetic bead L1, the second magnetic bead L2 and the first adjustable resistance RW1, the first amplifier A1 of the present embodiment adopts AD620 chip, the two ends of the first adjustable resistance RW1 are connected with the first pin and the 8th pin of the first amplifier A1 respectively, first capacitor C 1 one end is connected with the inverting input of the first amplifier A1, second capacitor C 2 one end are connected with the in-phase input end of the first amplifier A1, the first resistance R 1 and second resistance R 2 both homogeneous end ground connection, the other end of first resistance R 1 relative its earth terminal is connected on the circuit between the first capacitor C 1 and the first amplifier A1 inverting input, and the other end of second resistance R 2 relative its earth terminals is connected on the circuit between the second capacitor C 2 and the first amplifier A1 in-phase input end.The first magnetic bead L1 two ends connect respectively the 7th pin of positive source and the first amplifier A1, and the 3rd capacitor C 3 and the 4th capacitor C 4 parallel branch one end forming in parallel are connected on the circuit between the first magnetic bead L1 and the first amplifier A1, its other end ground connection.The second magnetic bead L2 two ends connect respectively the 4th pin of power cathode and the first amplifier A1, and the 5th capacitor C 5 and the 6th capacitor C 6 parallel branch one end forming in parallel are connected on the circuit between the second magnetic bead L2 and the first amplifier A1, its other end ground connection.
The bandwidth-limited circuit of the present embodiment comprises the second amplifier A2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th capacitor C 7 and the 8th capacitor C 8, wherein, the second amplifier A2 adopts OP777 chip, the energization pins external power supply of the second amplifier A2 and ground, the 3rd resistance R 3 two ends are connected with the first amplifier A1 output and the 8th capacitor C 8 respectively, the other end that the 8th capacitor C 8 connects the 3rd resistance R 3 ends is relatively connected with the in-phase input end of the second amplifier A2, the 4th resistance R 4 one end are connected on the circuit between the 3rd resistance R 3 and the 8th capacitor C 8, its other end is connected with the inverting input of the second amplifier A2, the 7th capacitor C 7, the 5th resistance R 5 and the 6th resistance R 6 homogeneous end ground connection, the other end of the 7th capacitor C 7 relative its earth terminals is connected on the circuit between the 3rd resistance R 3 and the 8th capacitor C 8, the other end of the 5th resistance R 5 relative its earth terminals is connected on the circuit between the 8th capacitor C 8 and the second amplifier A2 in-phase input end, the other end of the 6th resistance R 6 relative its earth terminals is connected on the circuit between the 4th resistance R 4 and the second amplifier A2 inverting input.The present embodiment is in the time of concrete application, and the first amplifier A1 and the second amplifier A2 all adopt 5V Power supply.
In the present embodiment, the resistance of the first resistance R 1 and the second resistance R 2 is 24.7K Ω, the resistance of the 3rd resistance R 3 is 10 K Ω, the resistance of the 4th resistance R 4 is 28 K Ω, the resistance of the 5th resistance R 5 is 20 K Ω, the resistance of the 6th resistance R 6 and the 7th resistance R 7 is 10 K Ω, the resistance adjustable extent of the first adjustable resistance RW1 is 0～50 K Ω, first capacitor C 1 of the present embodiment, the second capacitor C 2, the 3rd capacitor C 3, the 6th capacitor C 6, the capacitance of the 7th capacitor C 7 and the 8th capacitor C 8 is 0.1 μ F, both have all adopted polarity tantalum electric capacity the 4th capacitor C 4 and the 5th capacitor C 5, both capacitances are 10 μ F.
When the present embodiment application, the signal that transducer detects is inputted with the other end that the second capacitor C 2 is connected the first amplifier A1 end relatively by the first capacitor C 1, the high-pass filtering circuit filtering low-frequency disturbance being formed by the first capacitor C 1, the second capacitor C 2, the first resistance R 1 and the second resistance R 2, by the resistance that regulates the first adjustable resistance RW1, the gain of amplifying is regulated, after amplifying, carry out filtering through bandwidth-limited circuit again, then exported by amplifying signal incoming line.
As mentioned above, can realize preferably the present invention.
Claims (7)
1. amplify the module of signal in transformer station's gas concentration detection system, it is characterized in that, comprise amplifying circuit, bandwidth-limited circuit and amplifying signal outlet line, described amplifying circuit comprises the first amplifier (A1), described bandwidth-limited circuit comprises the second amplifier (A2), the 3rd resistance (R3), the 4th resistance (R4), the 7th electric capacity (C7) and the 8th electric capacity (C8), described the 3rd resistance (R3) two ends are connected with the first amplifier (A1) output and the 8th electric capacity (C8) respectively, the other end that the 8th electric capacity (C8) connects the 3rd resistance (R3) end is relatively connected with the in-phase input end of the second amplifier (A2), the 4th resistance (R4) one end is connected on the circuit between the 3rd resistance (R3) and the 8th electric capacity (C8), its other end is connected with the inverting input of the second amplifier (A2), described the 7th electric capacity (C7) one end is connected on the circuit between the 3rd resistance (R3) and the 8th electric capacity (C8), its other end ground connection, described amplifying signal outlet line is connected with the output of the second amplifier (A2).
2. module of amplifying signal in transformer station's gas concentration detection system according to claim 1, is characterized in that, described the first amplifier (A1) adopts AD620 chip.
3. module of amplifying signal in transformer station's gas concentration detection system according to claim 2, it is characterized in that, described amplifying circuit also comprises the first adjustable resistance (RW1), and the two ends of the first adjustable resistance (RW1) are connected with the first pin and the 8th pin of the first amplifier (A1) respectively.
4. module of amplifying signal in transformer station's gas concentration detection system according to claim 2, it is characterized in that, described amplifying circuit also comprises the first magnetic bead (L1), the second magnetic bead (L2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5) and the 6th electric capacity (C6), described the first magnetic bead (L1) two ends connect respectively the 7th pin of positive source and the first amplifier (A1), described the 3rd electric capacity (C3) and the 4th electric capacity (C4) parallel branch one end forming in parallel is connected on the circuit between the first magnetic bead (L1) and the first amplifier (A1), its other end ground connection, described the second magnetic bead (L2) two ends connect respectively the 4th pin of power cathode and the first amplifier (A1), described the 5th electric capacity (C5) and the 6th electric capacity (C6) parallel branch one end forming in parallel is connected on the circuit between the second magnetic bead (L2) and the first amplifier (A1), its other end ground connection.
5. module of amplifying signal in transformer station's gas concentration detection system according to claim 1, it is characterized in that, described bandwidth-limited circuit also comprises the 5th resistance (R5) and the 6th resistance (R6), described the 5th resistance (R5) and the 6th resistance (R6) homogeneous end ground connection, the 5th resistance (R5) the relatively other end of its earth terminal is connected on the circuit between the 8th electric capacity (C8) and the second amplifier (A2) in-phase input end, the 6th resistance (R6) the relatively other end of its earth terminal is connected on the circuit between the 4th resistance (R4) and the second amplifier (A2) inverting input.
6. module of amplifying signal in transformer station's gas concentration detection system according to claim 1, is characterized in that, described the second amplifier (A2) adopts OP777 chip.
7. according to the module of signal in the amplification transformer station gas concentration detection system described in any one in claim 1～6, it is characterized in that, described amplifying circuit also comprises the first electric capacity (C1), the second electric capacity (C2), the first resistance (R1) and the second resistance (R2), described the first electric capacity (C1) one end is connected with the inverting input of the first amplifier (A1), the second electric capacity (C2) one end is connected with the in-phase input end of the first amplifier (A1), both homogeneous end ground connection of the first resistance (R1) and the second resistance (R2), the first resistance (R1) the relatively other end of its earth terminal is connected on the circuit between the first electric capacity (C1) and the first amplifier (A1) inverting input, the second resistance (R2) the relatively other end of its earth terminal is connected on the circuit between the second electric capacity (C2) and the first amplifier (A1) in-phase input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274754.6A CN104038161B (en) | 2014-06-19 | 2014-06-19 | Amplify the module of signal in transformer station's gas concentration detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410274754.6A CN104038161B (en) | 2014-06-19 | 2014-06-19 | Amplify the module of signal in transformer station's gas concentration detection system |
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| CN104038161A true CN104038161A (en) | 2014-09-10 |
| CN104038161B CN104038161B (en) | 2016-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738573A (en) * | 2016-02-27 | 2016-07-06 | 乐清市启铭电气有限公司 | Portable gas alarming device and debugging method |
| CN106685373A (en) * | 2017-01-04 | 2017-05-17 | 四川友邻有家电子商务有限公司 | Signal amplification circuit of double-screen all-in-one machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414807B (en) * | 2008-11-24 | 2011-02-09 | 薛文伟 | Signal amplification circuit |
| CN203883774U (en) * | 2014-06-19 | 2014-10-15 | 国网四川省电力公司成都市新都供电分公司 | Module for amplifying signals in transformer substation gas concentration detection system |
-
2014
- 2014-06-19 CN CN201410274754.6A patent/CN104038161B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738573A (en) * | 2016-02-27 | 2016-07-06 | 乐清市启铭电气有限公司 | Portable gas alarming device and debugging method |
| CN105738573B (en) * | 2016-02-27 | 2017-11-28 | 乐清市启铭电气有限公司 | A kind of portable gas alarm and adjusting process |
| CN106685373A (en) * | 2017-01-04 | 2017-05-17 | 四川友邻有家电子商务有限公司 | Signal amplification circuit of double-screen all-in-one machine |
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| Publication number | Publication date |
|---|---|
| CN104038161B (en) | 2016-11-09 |
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