CN204392204U - A kind of ultra-weak electronic signal low-power consumption filter circuit - Google Patents
A kind of ultra-weak electronic signal low-power consumption filter circuit Download PDFInfo
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- CN204392204U CN204392204U CN201520082687.8U CN201520082687U CN204392204U CN 204392204 U CN204392204 U CN 204392204U CN 201520082687 U CN201520082687 U CN 201520082687U CN 204392204 U CN204392204 U CN 204392204U
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Abstract
The utility model discloses a kind of ultra-weak electronic signal low-power consumption filter circuit, this filter circuit is by operational amplifier A 1, A2, resistance R1, R2, R3, R4, R5 and R6 and electric capacity C1, C2 and C3 forms, input signal Vin is connected with the normal phase input end of operational amplifier A 1 through resistance R1 with R2, the output of circuit signal output end vo ut and A1 is connected, filter circuit is with adjustable Q value, the active rejector circuit of double T is core, and on active rejector circuit basis, turn increase the operational amplifier with feedback function, this ultra-weak electronic signal filter circuit construction is simple, with low cost, there is good filtering, amplify, feedback, regulatory function, in low frequency signal information processing, transfer of data, the aspects such as interference are suppressed to be used widely.
Description
Technical field
The utility model belongs to electric and electronic technical field, particularly relates to a kind of ultra-weak electronic signal low-power consumption filter circuit.
Background technology
To the frequency of signal, there is optionally circuit and be called filter circuit, it can make the signal in certain particular frequency range pass through, the signal beyond this frequency range is stoped to pass through. low pass (LPF) can be divided into according to the difference of band connection frequency, high pass (HPF), band logical (BPF) hinders (BEF) four kinds of filter circuits with band, active filter and passive filter can be divided into again with or without active element according in filter circuit. passive filtering is coupling by inductance and electric capacity and forms a low resistance state path to certain subharmonic current, passive filtering cost is low, stable, but harmonic filtration rate generally only has 80, active power filtering can effective bucking-out system harmonic wave, and for small-power low frequency signal, active power filtering is better than passive filter circuit overall performance, filtering harmonic wave is with better function.
Early stage harmonic detecting all adopts filter to realize, and also exists easily to be disturbed, to detect the defects such as harmonic number is few.When software FFT(fast Fourier transform) algorithm occur after, owing to overcoming the defect of hardware harmonic detecting mode, be thus widely applied, in current most of intelligent power supply system harmonic detecting and analyze all adopt this software algorithm to realize.But in actual applications, because software FFT algorithm needs the data of a complete primitive period, and the harmonic number as detected raises, sampled point must be multiplied, then problems such as taking processor memory space is large, data operation time length, spectral aliasing can be produced, this will certainly increase very large load to CPU, even likely has influence on real-time and the stability of control system, and uses the cost that high performance processor will inevitably increase system instead.
Utility model content
The purpose of this utility model is to provide a kind of ultra-weak electronic signal low-power consumption filter circuit, the utility model has good filtering, amplification, feedback, regulatory function, can be used widely in low frequency signal information processing, transfer of data, suppression interference etc.。
The technical scheme that the utility model solves the problem is: a kind of ultra-weak electronic signal low-power consumption filter circuit, comprises two operational amplifiers, 6 resistance and 3 electric capacity, it is characterized in that, input signal end (Vin) is connected with the normal phase input end (1) of the first operational amplifier (A1) with the second resistance (R2) through first resistance (R1) of series connection, the inverting input (2) of the first operational amplifier (A1) is connected with the output (4) of the first operational amplifier by the 4th resistance (R4), the positive power source terminal (5) of the first operational amplifier (A1) connects+5V power supply, the negative power end (3) of the first operational amplifier (A1) connects-5V power supply, the output (4) of the first operational amplifier (A1) is connected with circuit signal output (Vout), first electric capacity (C1) and the second electric capacity (C2) are connected between the normal phase input end (1) of signal input part (Vin) and the first operational amplifier (A1), and the 5th resistance (R5) is connected between the output (4) of the first operational amplifier (A1) and ground, input signal end (Vin) is connected with the output (6) of the second operational amplifier (A2) through the 3rd electric capacity (C3), the inverting input (9) of the second operational amplifier (A2) is connected with its output (6) through the 6th resistance (R6), to connect between the first electric capacity (C1) and the output (6) of the second operational amplifier (A2) the 3rd resistance (R3), the positive power source terminal (7) of the second operational amplifier (A2) connects+12V power supply, the negative power end (10) of the second operational amplifier (A2) connects-12V power supply, the input end grounding of the second operational amplifier (A2).
By such scheme, the model of described first operational amplifier (A1) is ICL7650S chip, and the model of described second operational amplifier (A2) is SGM8141.
The principle of this device work is: band stop filter refer to a certain inband signal be subject to very high attenuation or suppress interference signal not by, at the circuit structure that all the other frequency range signal then can pass through smoothly, be mainly used in eliminating some unwanted signal, to reduce the interference to useful signal.The active rejector circuit of one-level in-phase proportion amplifier is added after the double-t filter network that resistance, electric capacity are formed, form basic second order active rejector circuit, wherein R1, R2, C1 and C2, C3, R3 form double-T network, and operational amplifier A 2 has amplification and feedback effect.The filter circuit design of filtering 50 Hz Hz noise, adopt the active rejector circuit of adjustable Q value double T with filtering, amplification, feedback, regulatory function, on active rejector circuit basis, turn increase the operational amplifier U2 with feedback function and the potentiometer R3 with regulatory function.Wherein, potentiometer R3 has the effect of the quality factor q of regulating circuit, Q value is larger, resistance band is narrower, selecting frequency characteristic is better. for 50 Hz power frequency and second harmonics thereof, devise two arrowband stopband center frequencies, be respectively the active rejector circuit of Independent adjustable Q value double T of 50 Hz and 100 Hz, the two is successively connected in series i.e. formation there is filtering 50 Hz interference signal.
The beneficial effect that the utility model device brings is: this weak biological signal of telecommunication filter circuit construction is simple, with low cost, there is good filtering, amplification, feedback, regulatory function, can be used widely in low frequency signal information processing, transfer of data, suppression interference etc.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the schematic diagram of micro-signal of telecommunication 100Hz filter circuit, this micro-signal of telecommunication 100Hz filter circuit, by operational amplifier A 1, A2, and resistance R1, R2, R3, R4, R5 and R6 and electric capacity C1, C2 and C3 composition; Input signal Vin is connected with the normal phase input end 1 of operational amplifier A 1 through resistance R1 with R2, and circuit signal output end vo ut is connected with the output 4 of operational amplifier A 1; The positive power source terminal 5 of operational amplifier A 1 connects+5V power supply, and the negative power end 3 of A1 connects-5V power supply, and the positive power source terminal 2 of operational amplifier A 2 connects+5V power supply, and the negative power end 5 of A2 connects-5V power supply, and the inverting input 4 of A2 is connected with its output 1 through resistance R6; Resistance R1 is connected between signal input part Vin and resistance R2, resistance R2 is connected between resistance R1 and A1 normal phase input end 1, resistance R3 is connected between the output 1 of electric capacity C1 and operational amplifier A 2, resistance R4 is connected between A1 inverting input 2 and its output 4, and resistance R5 is connected between the output 4 of A1 and ground; Electric capacity C1 and electric capacity C2 is connected between the normal phase input end 1 of signal input part Vin and A1; Electric capacity C3 is connected between the output 1 of signal input part Vin and operational amplifier A 2; The model of operational amplifier A 1 is ICL7650S chip; The model of operational amplifier A 2 is SGM8141, is a kind of single channel super low-power consumption operational amplifier.
General technical staff of the technical field of the invention also can understand in addition to the foregoing, can change combination further in this explanation and illustrated specific embodiment.Such as, single channel super low-power consumption operational amplifier A 1, A2 can be replaced by the operational amplifier of other types according to actual condition.
Claims (4)
1. a ultra-weak electronic signal low-power consumption filter circuit, comprises two operational amplifiers, 6 resistance and 3 electric capacity; It is characterized in that, input signal end is connected with the normal phase input end of the second resistance with the first operational amplifier through the first resistance of series connection, the inverting input of the first operational amplifier is connected with the output of the first operational amplifier by the 4th resistance, positive supply termination+5V the power supply of the first operational amplifier, negative supply termination-5V the power supply of the first operational amplifier, the output of the first operational amplifier is connected with circuit signal output; First electric capacity and the second capacitances in series between signal input part and the normal phase input end of the first operational amplifier, between the output that the 5th resistance is connected on the first operational amplifier and ground; Input signal end is connected with the output of the second operational amplifier through the 3rd electric capacity, the inverting input of the second operational amplifier is connected with its output through the 6th resistance, to connect between the first electric capacity and the output of the second operational amplifier the 3rd resistance, positive supply termination+5V the power supply of the second operational amplifier, negative supply termination-5V the power supply of the second operational amplifier, the input end grounding of the second operational amplifier.
2. low-power consumption filter circuit according to claim 1, is characterized in that, the model of the first operational amplifier (A1) is ICL7650S chip.
3. low-power consumption filter circuit according to claim 1, is characterized in that, the second operational amplifier (A2) is single channel super low-power consumption operational amplifier.
4. low-power consumption filter circuit according to claim 1, is characterized in that, the model of the second operational amplifier (A2) is SGM8141.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520082687.8U CN204392204U (en) | 2015-02-06 | 2015-02-06 | A kind of ultra-weak electronic signal low-power consumption filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520082687.8U CN204392204U (en) | 2015-02-06 | 2015-02-06 | A kind of ultra-weak electronic signal low-power consumption filter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204392204U true CN204392204U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520082687.8U Expired - Fee Related CN204392204U (en) | 2015-02-06 | 2015-02-06 | A kind of ultra-weak electronic signal low-power consumption filter circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639085A (en) * | 2015-02-06 | 2015-05-20 | 国家电网公司 | Low-power filter circuit for weak electrical signals |
| CN106712740A (en) * | 2016-12-28 | 2017-05-24 | 宁波斯凯勒智能科技有限公司 | Multi-output tunable filter circuit |
| CN106788325A (en) * | 2016-12-28 | 2017-05-31 | 宁波斯凯勒智能科技有限公司 | A kind of high q-factor tunable filter circuit |
| CN110568304A (en) * | 2019-09-27 | 2019-12-13 | 上海锐开电气有限公司 | Filter circuit of iron core grounding power frequency current |
| CN111416588A (en) * | 2020-04-17 | 2020-07-14 | 濮阳市中原石化实业有限公司 | Wind power self-stabilizing system for wind head of film blowing machine |
-
2015
- 2015-02-06 CN CN201520082687.8U patent/CN204392204U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639085A (en) * | 2015-02-06 | 2015-05-20 | 国家电网公司 | Low-power filter circuit for weak electrical signals |
| CN106712740A (en) * | 2016-12-28 | 2017-05-24 | 宁波斯凯勒智能科技有限公司 | Multi-output tunable filter circuit |
| CN106788325A (en) * | 2016-12-28 | 2017-05-31 | 宁波斯凯勒智能科技有限公司 | A kind of high q-factor tunable filter circuit |
| CN110568304A (en) * | 2019-09-27 | 2019-12-13 | 上海锐开电气有限公司 | Filter circuit of iron core grounding power frequency current |
| CN111416588A (en) * | 2020-04-17 | 2020-07-14 | 濮阳市中原石化实业有限公司 | Wind power self-stabilizing system for wind head of film blowing machine |
| CN111416588B (en) * | 2020-04-17 | 2024-01-30 | 濮阳市中原石化实业有限公司 | Wind head and wind power self-stabilizing system of film blowing machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 |