CN104038162B - The signal amplification circuit of transformer station's gas concentration detection system - Google Patents
The signal amplification circuit of transformer station's gas concentration detection system Download PDFInfo
- Publication number
- CN104038162B CN104038162B CN201410274780.9A CN201410274780A CN104038162B CN 104038162 B CN104038162 B CN 104038162B CN 201410274780 A CN201410274780 A CN 201410274780A CN 104038162 B CN104038162 B CN 104038162B
- Authority
- CN
- China
- Prior art keywords
- resistance
- amplifier
- electric capacity
- circuit
- gas concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses the signal amplification circuit of transformer station's gas concentration detection system, including primary amplifying circuit, bandwidth-limited circuit, secondary amplification circuit and amplification output line road, primary amplifying circuit includes the first amplifier, 3rd resistance two ends of bandwidth-limited circuit are connected with the first amplifier out and the 8th electric capacity respectively, the in-phase input end of the other end and the second amplifier that its 8th electric capacity connects the 3rd resistance terminal relatively connects, its the 4th resistance one end is connected on the circuit between the 3rd resistance and the 8th electric capacity, the inverting input of the 4th resistance other end and the second amplifier connects.3rd amplifier in-phase input end of secondary amplification circuit and the second amplifier out connect, and its second adjustable resistance two ends are connected with the 3rd amplifier inverting input and outfan respectively, and its 3rd amplifier out is connected with amplifying output line road.Amplify and filtering through two-stage when the present invention applies, can guarantee that detectable signal can accurately show follow-up.
Description
Technical field
The present invention relates to substation safety protection field, the specifically signal amplification circuit of transformer station's gas concentration detection system.
Background technology
Transformer station is chronically at closed state, and in it, air is in first valve state, easily deposits the gas that a large amount of molecular weight are high, therefore, gas concentration in transformer station is carried out periodic detection particularly important in transformer station.In order to detect gas concentration in transformer station, devise a kind of transformer station gas concentration detection system now, it includes sensor, D.C. regulated power supply, analog to digital conversion circuit and digital display circuit, it is that whole system is powered by D.C. regulated power supply during the application of this detecting system, the gas concentration signal detected is converted into voltage signal by sensor, and shows gas concentration value by digital display circuit after analog to digital conversion circuit is changed.Wherein, the weak output signal that during application of this system, sensor detects, signal can occur decay in transmitting procedure and absorb, and digital display circuit can accurately not reflect gas concentration in transformer station, so, operating personnel can cause misleading there is potential safety hazard.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that sensor detection signal can be amplified by one, in order to the signal amplification circuit of transformer station's gas concentration detection system of gas concentration in display transformer station directly perceived.
nullThe present invention solves the problems referred to above and is achieved through the following technical solutions: the signal amplification circuit of transformer station's gas concentration detection system，Including primary amplifying circuit、Bandwidth-limited circuit、Secondary amplification circuit and amplification output line road，Described primary amplifying circuit includes the first amplifier，Described bandwidth-limited circuit includes the second amplifier、3rd resistance、4th resistance、5th resistance、6th resistance、7th electric capacity and the 8th electric capacity，Described 3rd resistance two ends are connected with the first amplifier out and the 8th electric capacity respectively，The in-phase input end of the other end and the second amplifier that the 8th electric capacity connects the 3rd resistance terminal relatively connects，4th resistance one end is connected on the circuit between the 3rd resistance and the 8th electric capacity，The inverting input of its other end and the second amplifier connects，Described 7th electric capacity、5th resistance and the 6th resistance homogeneous end ground connection，7th electric capacity is connected on the circuit between the 3rd resistance and the 8th electric capacity relative to the other end of its earth terminal，5th resistance is connected on the circuit between the 8th electric capacity and the second amplifier in-phase input end relative to the other end of its earth terminal，6th resistance is connected on the circuit between the 4th resistance and the second amplifier inverting input relative to the other end of its earth terminal；Described secondary amplification circuit includes the 3rd amplifier, the second adjustable resistance, the 7th resistance and the 8th resistance, described 3rd amplifier in-phase input end and the second amplifier out connect, second adjustable resistance two ends are connected with the 3rd amplifier inverting input and outfan respectively, 7th resistance one end is connected on the circuit between the 3rd amplifier inverting input and the second adjustable resistance, its other end ground connection, described 8th resistance two ends are connected with the 3rd amplifier out and amplification output line road respectively.When the present invention applies, the signal that sensor detects is inputted by in-phase input end and the inverting input of the first amplifier, after the first amplifier carries out primary amplification, bandwidth-limited circuit it is filtered, then by amplifying the output of output line road after secondary amplification circuit is amplified again.
Because AD620 is the difference instrumentation amplifier integrated by three accurate amplifiers, it has low skew, high-gain, the feature of high conjugated analoging systeming ratio, and further, described first amplifier uses AD620 chip.
Further, described primary amplifying circuit also includes 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 power end noise coupling from entering in the first amplifier, further, described primary amplifying circuit also includes 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 first magnetic bead two ends connect the 7th pin of positive source and the first amplifier respectively, parallel branch one end that described 3rd electric capacity and the 4th electric capacity parallel connection are constituted is connected on the circuit between the first magnetic bead and the first amplifier, its other end ground connection；Described second magnetic bead two ends connect the 4th pin of power cathode and the first amplifier respectively, and parallel branch one end of described 5th electric capacity and the 6th electric capacity parallel connection composition is connected on the circuit between the second magnetic bead and the first amplifier, its other end ground connection.So, during the present invention, the first each energization pins of amplifier is connected to ground two electric capacity, and carries out power decoupling by a magnetic bead series connection.
Further, the signal amplification circuit of transformer station's gas concentration detection system, also include that the 9th resistance, described 9th resistance one end are connected to amplify on output line road, its other end external power supply.
Because OP777 chip is a ultraprecise low-noise operational amplifier, having extremely low voltage and current skew and the highest gain stability, further, described second amplifier and the 3rd amplifier all use OP777 chip.
Further, described primary amplifying circuit also includes 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, first resistance and second resistance both of which one end ground connection, first resistance is connected on the circuit between the first electric capacity and the first amplifier inverting input relative to the other end of its earth terminal, and the second resistance is connected on the circuit between the second electric capacity and the first amplifier in-phase input end relative to the other end of its earth terminal.So, AC coupled input is carried out by the first electric capacity and the second electric capacity when the present invention applies, first electric capacity and the first resistance composition high pass filter, second electric capacity and the second resistance composition high pass filter, the present invention passes through the high pass filter of the first electric capacity, the second electric capacity, the first resistance and the second resistance composition to reduce the low-frequency disturbance in environment.
nullIn sum，The method have the advantages that (1) present invention includes primary amplifying circuit、Bandwidth-limited circuit、Secondary amplification circuit and amplification output line road，Primary amplifying circuit includes the first amplifier，Bandwidth-limited circuit includes the second amplifier、3rd resistance、4th resistance、5th resistance、6th resistance、7th electric capacity and the 8th electric capacity，Secondary amplification circuit includes the 3rd amplifier、Second adjustable resistance、7th resistance and the 8th resistance，3rd amplifier in-phase input end and the second amplifier out connect，Second adjustable resistance two ends are connected with the 3rd amplifier inverting input and outfan respectively，The present invention uses said structure，Overall structure is simple，Facilitate implementation，When the present invention applies, sensor detection signal is inputted by the first amplifier and is amplified，Input secondary amplification circuit by bandwidth-limited circuit after being filtered again again to amplify，Sensor detection signal is amplified can guarantee that digital display circuit reflects gas concentration in transformer station accurately，So，The potential safety hazard that detection is not the most existing can be eliminated.
(2) it is filtered by bandwidth-limited circuit when the present invention amplifies again, the noise that in bandwidth-limited circuit energy filtering circuit, element produces, so, can guarantee that signal also has sufficiently high precision after again amplifying.
Accompanying drawing explanation
The structural representation of one specific embodiment of Fig. 1 present invention.
Entitled corresponding to reference in accompanying drawing: R1, first resistance, R2, second resistance, R3, 3rd resistance, R4, 4th resistance, R5, 5th resistance, R6, 6th resistance, R7, 7th resistance, R8, 8th resistance, R9, 9th resistance, RW1, first adjustable resistance, RW2, second adjustable resistance, C1, first electric capacity, C2, second electric capacity, C3, 3rd electric capacity, C4, 4th electric capacity, C5, 5th electric capacity, C6, 6th electric capacity, C7, 7th electric capacity, C8, 8th electric capacity, A1, first amplifier, A2, second amplifier, A3, 3rd amplifier, L1, first magnetic bead, L2, second magnetic bead.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is done detailed description further, but embodiments of the present invention are not limited to this.
Embodiment:
nullAs shown in Figure 1，The signal amplification circuit of transformer station's gas concentration detection system，Including primary amplifying circuit、Bandwidth-limited circuit、Secondary amplification circuit and amplification output line road，Wherein，Primary amplifying circuit includes the first amplifier A1、First electric capacity C1、Second electric capacity C2、3rd electric capacity C3、4th electric capacity C4、5th electric capacity C5、6th electric capacity C6、First resistance R1、Second resistance R2、First magnetic bead L1、Second magnetic bead L2 and the first adjustable resistance RW1，The first amplifier A1 of the present embodiment uses 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 electric capacity C1 one end is connected with the inverting input of the first amplifier A1，Second electric capacity C2 one end is connected with the in-phase input end of the first amplifier A1，First resistance R1 and second resistance R2 both of which one end ground connection，First resistance R1 is connected on the circuit between the first electric capacity C1 and the first amplifier A1 inverting input relative to the other end of its earth terminal，Second resistance R2 is connected on the circuit between the second electric capacity C2 and the first amplifier A1 in-phase input end relative to the other end of its earth terminal.First magnetic bead L1 two ends connect positive source and the 7th pin of the first amplifier A1 respectively, and parallel branch one end of the 3rd electric capacity C3 and the 4th electric capacity C4 parallel connection composition is connected on the circuit between the first magnetic bead L1 and the first amplifier A1, its other end ground connection.Second magnetic bead L2 two ends connect power cathode and the 4th pin of the first amplifier A1 respectively, and parallel branch one end of the 5th electric capacity C5 and the 6th electric capacity C6 parallel connection composition is connected on the circuit between the second magnetic bead L2 and the first amplifier A1, its other end ground connection.
nullThe bandwidth-limited circuit of the present embodiment includes the second amplifier A2、3rd resistance R3、4th resistance R4、5th resistance R5、6th resistance R6、7th electric capacity C7 and the 8th electric capacity C8，Wherein，Second amplifier A2 uses OP777 chip，The energization pins external power supply of the second amplifier A2 and ground，3rd resistance R3 two ends are connected with the first amplifier A1 outfan and the 8th electric capacity C8 respectively，The in-phase input end of the other end and the second amplifier A2 that the 8th electric capacity C8 connects the 3rd resistance R3 end relatively connects，4th resistance R4 one end is connected on the circuit between the 3rd resistance R3 and the 8th electric capacity C8，The inverting input of its other end and the second amplifier A2 connects，7th electric capacity C7、5th resistance R5 and the 6th resistance R6 homogeneous end ground connection，7th electric capacity C7 is connected on the circuit between the 3rd resistance R3 and the 8th electric capacity C8 relative to the other end of its earth terminal，5th resistance R5 is connected on the circuit between the 8th electric capacity C8 and the second amplifier A2 in-phase input end relative to the other end of its earth terminal，6th resistance R6 is connected on the circuit between the 4th resistance R4 and the second amplifier A2 inverting input relative to the other end of its earth terminal.
The secondary amplification circuit of the present embodiment includes the 3rd amplifier A3, second adjustable resistance RW2, 7th resistance R7 and the 8th resistance R8, wherein, 3rd amplifier A3 is also adopted by OP777 chip, 3rd amplifier A3 energization pins external power supply both positive and negative polarity, 3rd amplifier A3 in-phase input end and the second amplifier A2 outfan connect, second adjustable resistance RW2 two ends are connected with the 3rd amplifier A3 inverting input and outfan respectively, 7th resistance R7 one end is connected on the circuit between the 3rd amplifier A3 inverting input and the second adjustable resistance RW2, its other end ground connection, 8th resistance R8 two ends are connected with the 3rd amplifier A3 outfan and amplification output line road respectively.The present embodiment also includes that the 9th resistance R9, the 9th resistance R9 one end are connected to amplify on output line road, its other end external power supply.The present embodiment is when specifically applying, and the first amplifier A1, the second amplifier A2 and the 3rd amplifier A3 all use 5V power supply to power.
nullIn the present embodiment, the resistance of the first resistance R1 and the second resistance R2 is 24.7K Ω，The resistance of the 3rd resistance R3 is 10 K Ω，The resistance of the 4th resistance R4 is 28 K Ω，The resistance of the 5th resistance R5 is 20 K Ω，The resistance of the 6th resistance R6 and the 7th resistance R7 is 10 K Ω，The resistance of the 8th resistance R8 and the 9th resistance R9 is 20 K Ω，The resistance adjustable extent of the first adjustable resistance RW1 is 0～50 K Ω，The resistance adjustable extent of the second adjustable resistance RW2 is 0～200 K Ω，The first electric capacity C1 of the present embodiment、Second electric capacity C2、3rd electric capacity C3、6th electric capacity C6、The capacitance of the 7th electric capacity C7 and the 8th electric capacity C8 is 0.1 μ F，4th electric capacity C4 and the 5th electric capacity C5 both of which use polarized tantalum electric capacity，Both capacitances are 10 μ F.
During the present embodiment application, the signal that sensor detects is connected the other end input of the first amplifier A1 end relatively by the first electric capacity C1 and the second electric capacity C2, by the first electric capacity C1, second electric capacity C2, the high-pass filtering circuit that first resistance R1 and the second resistance R2 is constituted filters low-frequency disturbance, the gain amplified primary by the resistance regulating the first adjustable resistance RW1 is adjusted, it is filtered through bandwidth-limited circuit again after carrying out primary amplification, when ensureing secondary amplification, input signal stablizes, the gain amplified secondary by the resistance regulating the second adjustable resistance RW2 is adjusted, carry out the signal after secondary amplification by amplifying the output of signal input line road.
As it has been described above, the present invention can preferably be realized.
Claims (5)
- null1. the signal amplification circuit of transformer station's gas concentration detection system，It is characterized in that，Including primary amplifying circuit、Bandwidth-limited circuit、Secondary amplification circuit and amplification output line road，Described primary amplifying circuit includes the first amplifier (A1)，Described bandwidth-limited circuit includes the second amplifier (A2)、3rd resistance (R3)、4th resistance (R4)、5th resistance (R5)、6th resistance (R6)、7th electric capacity (C7) and the 8th electric capacity (C8)，Described 3rd resistance (R3) two ends are connected with the first amplifier (A1) outfan and the 8th electric capacity (C8) respectively，8th electric capacity (C8) connects the other end and the in-phase input end connection of the second amplifier (A2) that the 3rd resistance (R3) is held relatively，4th resistance (R4) one end is connected on the circuit between the 3rd resistance (R3) and the 8th electric capacity (C8)，The inverting input of its other end and the second amplifier (A2) connects，Described 7th electric capacity (C7)、5th resistance (R5) and the 6th resistance (R6) homogeneous end ground connection，The other end of the 7th electric capacity (C7) its earth terminal relatively is connected on the circuit between the 3rd resistance (R3) and the 8th electric capacity (C8)，The other end of the 5th resistance (R5) its earth terminal relatively is connected on the circuit between the 8th electric capacity (C8) and the second amplifier (A2) in-phase input end，The other end of the 6th resistance (R6) its earth terminal relatively is connected on the circuit between the 4th resistance (R4) and the second amplifier (A2) inverting input；Described secondary amplification circuit includes the 3rd amplifier (A3), second adjustable resistance (RW2), 7th resistance (R7) and the 8th resistance (R8), described 3rd amplifier (A3) in-phase input end and the second amplifier (A2) outfan connect, second adjustable resistance (RW2) two ends are connected with the 3rd amplifier (A3) inverting input and outfan respectively, 7th resistance (R7) one end is connected on the circuit between the 3rd amplifier (A3) inverting input and the second adjustable resistance (RW2), its other end ground connection, described 8th resistance (R8) two ends are connected with the 3rd amplifier (A3) outfan and amplification output line road respectively；Described first amplifier (A1) uses AD620 chip；Also include that the 9th resistance (R9), described 9th resistance (R9) one end are connected to amplify on output line road, its other end external power supply.
- The signal amplification circuit of transformer station the most according to claim 1 gas concentration detection system, it is characterized in that, described primary amplifying circuit also includes 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.
- The signal amplification circuit of transformer station the most according to claim 1 gas concentration detection system, it is characterized in that, described primary amplifying circuit also includes the first magnetic bead (L1), second magnetic bead (L2), 3rd electric capacity (C3), 4th electric capacity (C4), 5th electric capacity (C5) and the 6th electric capacity (C6), described first magnetic bead (L1) two ends connect positive source and the 7th pin of the first amplifier (A1) respectively, described 3rd electric capacity (C3) and the 4th electric capacity (C4) parallel branch one end constituted in parallel are connected on the circuit between the first magnetic bead (L1) and the first amplifier (A1), its other end ground connection；Described second magnetic bead (L2) two ends connect power cathode and the 4th pin of the first amplifier (A1) respectively, described 5th electric capacity (C5) and the 6th electric capacity (C6) parallel branch one end constituted in parallel are connected on the circuit between the second magnetic bead (L2) and the first amplifier (A1), its other end ground connection.
- The signal amplification circuit of transformer station the most according to claim 1 gas concentration detection system, it is characterised in that described second amplifier (A2) and the 3rd amplifier (A3) all use OP777 chip.
- null5. according to the signal amplification circuit of the transformer station's gas concentration detection system described in any one in Claims 1 to 4，It is characterized in that，Described primary amplifying circuit also includes the first electric capacity (C1)、Second electric capacity (C2)、First resistance (R1) and the second resistance (R2)，Described first electric capacity (C1) one end is connected with the inverting input of the first amplifier (A1)，Second electric capacity (C2) one end is connected with the in-phase input end of the first amplifier (A1)，First resistance (R1) and the second resistance (R2) both of which one end ground connection，The other end of the first resistance (R1) its earth terminal relatively is connected on the circuit between the first electric capacity (C1) and the first amplifier (A1) inverting input，The other end of the second resistance (R2) its earth terminal relatively 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 |
|---|---|---|---|
| CN201410274780.9A CN104038162B (en) | 2014-06-19 | 2014-06-19 | The signal amplification circuit of transformer station's gas concentration detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410274780.9A CN104038162B (en) | 2014-06-19 | 2014-06-19 | The signal amplification circuit of transformer station's gas concentration detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104038162A CN104038162A (en) | 2014-09-10 |
| CN104038162B true CN104038162B (en) | 2016-10-05 |
Family
ID=51468786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410274780.9A Active CN104038162B (en) | 2014-06-19 | 2014-06-19 | The signal amplification circuit of transformer station's gas concentration detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104038162B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958962B (en) * | 2016-06-07 | 2018-07-06 | 河北梅特电气设备股份有限公司 | A kind of filter circuit for being used to illuminate metering switch box |
| CN113708856B (en) * | 2021-08-13 | 2024-06-14 | 苏州翼凯通信科技有限公司 | Handheld base station information and signal strength acquisition device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001080A (en) * | 2006-12-31 | 2007-07-18 | 南京航空航天大学 | Programme-controlled gain charge amplifier based on computer system bus |
| CN203883775U (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 | Signal amplification circuit for substation gas concentration detection system |
-
2014
- 2014-06-19 CN CN201410274780.9A patent/CN104038162B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001080A (en) * | 2006-12-31 | 2007-07-18 | 南京航空航天大学 | Programme-controlled gain charge amplifier based on computer system bus |
| CN203883775U (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 | Signal amplification circuit for substation gas concentration detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104038162A (en) | 2014-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203849325U (en) | Alternating-current and direct-current voltage isolation differential sampling circuit | |
| WO2015139655A1 (en) | Residual current protection device | |
| CN107741571B (en) | Battery voltage detection circuit | |
| CN103852674A (en) | Residual current transformer secondary coil disconnection detection circuit | |
| CN104038161B (en) | Amplify the module of signal in transformer station's gas concentration detection system | |
| CN104038162B (en) | The signal amplification circuit of transformer station's gas concentration detection system | |
| CN108318729A (en) | A kind of direct-current high voltage detection circuit | |
| CN203732610U (en) | Current detection device | |
| CN203883778U (en) | Amplification module for detected signals in substation gas concentration detection system | |
| CN203883774U (en) | Module for amplifying signals in transformer substation gas concentration detection system | |
| CN204989290U (en) | Wide dynamic range's high -pressure side current detection circuit | |
| CN203883775U (en) | Signal amplification circuit for substation gas concentration detection system | |
| CN104038169A (en) | Amplification module for detecting signals in gas concentration detecting system of transformer substation | |
| CN108074364A (en) | Amplify the module of detectable signal in transformer anti-theft system | |
| CN203981772U (en) | The marking current pick-up unit of OLED CELL checkout equipment | |
| CN204349932U (en) | A kind of simple infrared signal two-stage amplifying circuit | |
| CN104601122A (en) | Amplifying circuit for optical sensor of Internet of Things | |
| CN103869863B (en) | Sensor conditioning circuit | |
| CN112904071A (en) | Zero-flux current transformer | |
| CN108075735A (en) | The module of signal in amplifying transformer anti-theft monitoring system | |
| CN108074362A (en) | The amplifying circuit of detectable signal in transformer anti-theft system | |
| CN203232525U (en) | Signal amplifying circuit in antitheft monitoring system of transformer | |
| CN102944250A (en) | Front-end conditioning circuit for measuring high impedance weak signal | |
| CN210347754U (en) | Residual current detection circuit | |
| CN203289386U (en) | Collected signals amplification module in transformer substation air-conditioner intelligent control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |