CN204156830U - A kind of filter - Google Patents
A kind of filter Download PDFInfo
- Publication number
- CN204156830U CN204156830U CN201420512945.7U CN201420512945U CN204156830U CN 204156830 U CN204156830 U CN 204156830U CN 201420512945 U CN201420512945 U CN 201420512945U CN 204156830 U CN204156830 U CN 204156830U
- Authority
- CN
- China
- Prior art keywords
- resistance
- output
- electric capacity
- amplifier
- operational amplifier
- 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.)
- Expired - Fee Related
Links
Landscapes
- Networks Using Active Elements (AREA)
Abstract
The utility model discloses a kind of filter, comprise filter input end U1, filter input end U1 is connected with electric capacity C1 one end, the electric capacity C1 other end is connected with electric capacity C2 one end, resistance R7 one end respectively, the electric capacity C2 other end is connected with the positive output end of resistance R8 one end, operational amplifier A 1 respectively, the inverting input of operational amplifier A 1 is by resistance R1 concatenation operation amplifier A1 output, and operational amplifier A 1 output is connected with electric capacity C3 one end, the electric capacity C3 other end connects the in-phase output end of the 3rd resistance R3 one end, operational amplifier A 2 respectively; The inverting input of operational amplifier A 2 is by resistance R2 concatenation operation amplifier A2 output, and operational amplifier A 2 output contact resistance R4 simultaneously; The other end of resistance R4 connects the reverse input end of amplifier A; The utility model can filter out low-frequency component unnecessary in signal, the ripple current of complete filtering Switching Power Supply.
Description
Technical field
The utility model relates to filter, specifically a kind of filter.
Background technology
Filter is a kind of frequency selective device, and specific frequency content in signal can be made to pass through, and other frequency content that greatly decays.In testing apparatus, utilize this frequency-selecting effect of filter, can filtering interfering noise or carry out spectrum analysis.And high pass filter allows that high-frequency signal passes through but weakens the filter that (or reduce) frequency passes through lower than cut-off frequency signal.Current high pass filter kind is on the market a lot, but it is unreliable to work, and practicality is not strong.
Utility model content
The purpose of this utility model is to provide a kind of good wave filtering effect, the filter of steady operation, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of filter, comprise filter input end U1, filter input end U1 is connected with electric capacity C1 one end, the electric capacity C1 other end is connected with electric capacity C2 one end, resistance R7 one end respectively, the electric capacity C2 other end is connected with the positive output end of resistance R8 one end, operational amplifier A 1 respectively, the inverting input of operational amplifier A 1 is by resistance R1 concatenation operation amplifier A1 output, and operational amplifier A 1 output is connected with electric capacity C3 one end, the electric capacity C3 other end connects the in-phase output end of the 3rd resistance R3 one end, operational amplifier A 2 respectively; The inverting input of operational amplifier A 2 is by resistance R2 concatenation operation amplifier A2 output, and operational amplifier A 2 output contact resistance R4 simultaneously; The other end of resistance R4 connects the reverse input end of amplifier A, resistance R4 is simultaneously by the emitter of resistance R6 connecting triode Q, the base stage of the output connecting triode Q of amplifier A, the positive input of amplifier A passes through the emitter of resistance R3 and emitter resistance Rt connecting triode Q, and the collector electrode of triode Q connects filter output U2; Described resistance R3 is also connected filter input end U1 with the wiring point of emitter resistance Rt simultaneously.
Further, described amplifier A, resistance R3, resistance R4, resistance R5 and resistance R6 form subtracter block.
Further, described resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 are identical with the resistance value of resistance R6.
Compared with prior art, the utility model can filter out low-frequency component unnecessary in signal, in electric power system, with high pass filter filtering certain and above each harmonic thereof during harmonic compensation, during circuit steady operation, Current Decomposition is a DC component and an alternating current component (ripple current), if do not compensated inductance ripple current, outputting inductance electric current, containing ripple component; Triode Q is operated in Linear Amplifer state, and its collector current (that is, offset current) equally decomposes a DC component and an alternating current component, superposes with output current, thus can the ripple current of completely filtering Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of filter.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of filter, comprise filter input end U1, filter input end U1 is connected with electric capacity C1 one end, the electric capacity C1 other end respectively with electric capacity C2 one end, resistance R7 one end is connected, the electric capacity C2 other end respectively with resistance R8 one end, the positive output end of operational amplifier A 1 is connected, the inverting input of operational amplifier A 1 is by resistance R1 concatenation operation amplifier A1 output, and operational amplifier A 1 output is connected with electric capacity C3 one end, the electric capacity C3 other end connects the 3rd resistance R3 one end respectively, the in-phase output end of operational amplifier A 2, the inverting input of operational amplifier A 2 is by resistance R2 concatenation operation amplifier A2 output, and operational amplifier A 2 output contact resistance R4 simultaneously, the other end of resistance R4 connects the reverse input end of amplifier A, resistance R4 is simultaneously by the emitter of resistance R6 connecting triode Q, the base stage of the output connecting triode Q of amplifier A, the positive input of amplifier A passes through the emitter of resistance R3 and emitter resistance Rt connecting triode Q, and the collector electrode of triode Q connects filter output U2, described resistance R3 is also connected filter input end U1 with the wiring point of emitter resistance Rt simultaneously, described amplifier A, resistance R3, resistance R4, resistance R5 and resistance R6 form subtracter block, described resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 are identical with the resistance value of resistance R6, during work, filter out low-frequency component unnecessary in signal, in electric power system, with high pass filter filtering certain and above each harmonic thereof during harmonic compensation, during high pass filter refers to and can allow in vehicle-mounted power amplifier, high-frequency signal passes through and does not allow the circuit that low frequency signal passes through, its effect is the bass contribution in elimination audio signal, enhancing middle pitch and treble contribution are to drive middle pitch and the voice unit of loud speaker, when circuit steady operation, Current Decomposition is a DC component and an alternating current component (ripple current), if do not compensated inductance ripple current, outputting inductance electric current, containing ripple component, triode Q is operated in Linear Amplifer state, and its collector current (that is, offset current) equally decomposes a DC component and an alternating current component, superposes with output current, thus can the ripple current of completely filtering Switching Power Supply.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (3)
1. a filter, comprise filter input end U1, it is characterized in that, filter input end U1 is connected with electric capacity C1 one end, the electric capacity C1 other end is connected with electric capacity C2 one end, resistance R7 one end respectively, the electric capacity C2 other end is connected with the positive output end of resistance R8 one end, operational amplifier A 1 respectively, the inverting input of operational amplifier A 1 is by resistance R1 concatenation operation amplifier A1 output, and operational amplifier A 1 output is connected with electric capacity C3 one end, the electric capacity C3 other end connects the in-phase output end of the 3rd resistance R3 one end, operational amplifier A 2 respectively; The inverting input of operational amplifier A 2 is by resistance R2 concatenation operation amplifier A2 output, and operational amplifier A 2 output contact resistance R4 simultaneously; The other end of resistance R4 connects the reverse input end of amplifier A, resistance R4 is simultaneously by the emitter of resistance R6 connecting triode Q, the base stage of the output connecting triode Q of amplifier A, the positive input of amplifier A passes through the emitter of resistance R3 and emitter resistance Rt connecting triode Q, and the collector electrode of triode Q connects filter output U2; Described resistance R3 is also connected filter input end U1 with the wiring point of emitter resistance Rt simultaneously.
2. filter according to claim 1, is characterized in that, described amplifier A, resistance R3, resistance R4, resistance R5 and resistance R6 form subtracter block.
3. filter according to claim 1, is characterized in that, described resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 are identical with the resistance value of resistance R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420512945.7U CN204156830U (en) | 2014-09-09 | 2014-09-09 | A kind of filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420512945.7U CN204156830U (en) | 2014-09-09 | 2014-09-09 | A kind of filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204156830U true CN204156830U (en) | 2015-02-11 |
Family
ID=52514917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420512945.7U Expired - Fee Related CN204156830U (en) | 2014-09-09 | 2014-09-09 | A kind of filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204156830U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732387A (en) * | 2017-09-29 | 2018-02-23 | 德清利维通讯科技股份有限公司 | Wave filter |
-
2014
- 2014-09-09 CN CN201420512945.7U patent/CN204156830U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732387A (en) * | 2017-09-29 | 2018-02-23 | 德清利维通讯科技股份有限公司 | Wave filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203416230U (en) | Filter | |
| CN103297894A (en) | Earphone power amplifier, working method and mobile terminal equipment | |
| CN105338446B (en) | Audio track control circuit | |
| CN204290889U (en) | A kind of filtering and amplifying circuit | |
| CN204156830U (en) | A kind of filter | |
| CN104410942A (en) | Phase shift type audio processing system by low-pass filtering and amplification | |
| CN103491482A (en) | Audio processing device for mobile terminals | |
| CN104348427B (en) | A kind of D class audio frequencies power amplifier, power amplifier and audio playing apparatus | |
| CN205051664U (en) | Filter | |
| CN203775149U (en) | Class-D power amplification chip with power limiting function and audio play device | |
| CN204304948U (en) | A kind of high-pass filter | |
| CN203984359U (en) | A kind of onboard audio power amplification circuit | |
| CN104300926A (en) | Audio power amplifier used for multimedia electronic equipment | |
| CN105487442A (en) | Reset switch mute function synchronous control circuit | |
| RU146421U1 (en) | ACOUSTIC SYSTEM | |
| CN202634678U (en) | Noise-reduction circuit | |
| CN203563019U (en) | Power amplification circuit for loudspeaker box loudspeaker | |
| CN102546895A (en) | Mobile phone and audio processing circuit thereof | |
| CN104469611A (en) | Audio processing system for widening range | |
| CN204206116U (en) | A kind of audio-frequency power amplifier for multimedia electronic equipment | |
| CN204104105U (en) | A kind of circuit of Earphone Amplifier | |
| CN205081763U (en) | Regulation and control formula earphone integrated amplifier circuit | |
| CN203522664U (en) | Tone control circuit | |
| CN203057083U (en) | High-accuracy negative feedback active audio machine | |
| CN203057468U (en) | Anti-sound cracking audio frequency machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20150211 Termination date: 20170909 |