CN204349935U - A kind of filter circuit of efficient filtering - Google Patents
A kind of filter circuit of efficient filtering Download PDFInfo
- Publication number
- CN204349935U CN204349935U CN201420814895.8U CN201420814895U CN204349935U CN 204349935 U CN204349935 U CN 204349935U CN 201420814895 U CN201420814895 U CN 201420814895U CN 204349935 U CN204349935 U CN 204349935U
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- filtering
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Abstract
The utility model belongs to filter circuit technical field, particularly relate to a kind of filter circuit of efficient filtering, comprise input J1, output J2, active power filtering, passive filtering, described active power filtering comprises triode Q1, resistance R4, electric capacity C1, electric capacity C4, resistance R1, amplifier U1, one end of the pin 2 connecting resistance R1 of described amplifier U1, one end of resistance R2, one end of another termination capacitor C1 of described resistance R1, the emitter of triode Q1, one end of the base stage connecting resistance R4 of described triode Q1, one end of electric capacity C4, one end of its collector electrode connecting resistance R4, the pin 2 of input J1, described passive filtering comprises resistance R3, resistance R2, electric capacity C3, electric capacity C2, one end of the pin 1 connecting resistance R3 of described input J1, the pin 1 of another termination amplifier U2 of described electric capacity C2, the other end of resistance R2 and meet output J2.
Description
Technical field
The utility model belongs to filter circuit technical field, particularly relates to a kind of filter circuit of efficient filtering.
Background technology
Filter (filter) refers to and reduces or eliminates the electric component of harmonic wave to effect on power system.Filter is a kind of device being used for eliminating jamming incoherent signal, obtains pure direct current by inputing or outputing through filtration.Frequency beyond the frequency of characteristic frequency or this frequency being carried out to the circuit of effective filtering, is exactly filter, and its function obtains a characteristic frequency exactly or eliminates a characteristic frequency.Often need to filter the electromagnetic wave of transmission in field of microwave communication, retain the electromagnetic wave of wavelength between 0.1 millimeter to 1 meter, also need in this process to use filter circuit.Existing filter circuit characteristic affects greatly by system parameters, can only eliminate specific a few subharmonic, and can produce amplification to some subharmonic, even can produce resonance phenomena, not be conducive to microwave communication.In addition, also have filter circuit to produce resonance phenomena, but integrated transporting discharging broadband is limited, what cause the operating frequency on filter circuit to be difficult to do is very high.And microwave communication is due to the transmission that its bandwidth, capacity are large, may be used for various telecommunication service, being constantly widely used, all there is very large defect in existing filter circuit, is unfavorable for the development of microwave communication.
Summary of the invention
The utility model provides a kind of filter circuit of efficient filtering, to solve filter circuit current in above-mentioned background technology, can produce the problem of resonance phenomena.
The technical problem that the utility model solves realizes by the following technical solutions: the utility model provides a kind of filter circuit of efficient filtering, it is characterized in that: comprise input J1, output J2, active power filtering, passive filtering, described active power filtering comprises triode Q1, resistance R4, electric capacity C1, electric capacity C4, resistance R1, one end of the pin 2 connecting resistance R1 of amplifier U1, described amplifier U1, one end of resistance R2, one end of another termination capacitor C1 of described resistance R1, the emitter of triode Q1, one end of the base stage connecting resistance R4 of described triode Q1, one end of electric capacity C4, one end of its collector electrode connecting resistance R4, the pin 2 of input J1, described passive filtering comprises resistance R3, resistance R2, electric capacity C3, one end of the pin 1 connecting resistance R3 of electric capacity C2, described input J1, one end of electric capacity C3, one end of electric capacity C1, one end of electric capacity C4, one end of electric capacity C2, the pin 3 of amplifier U1, the other end of the other end connecting resistance R3 of described electric capacity C3 and ground connection, the pin 1 of another termination amplifier U2 of described electric capacity C2, the other end of resistance R2 and meet output J2.
The resistance of described resistance R4 is greater than the resistance of resistance R3.
Described triode Q1 selects NPN transistor.
The beneficial effects of the utility model are:
In the active filter circuit of 1 this patent, adopt the design of triode Q1 and amplifier U1, when solution resistance R4 is excessive, the loss of direct voltage can be increased, and when C4 value is excessive, the problem that volume and weight increases can be made.
2 this patents are placed with power filter at input, then devise passive filtering again, adopt the design of twice filtering, and its good wave filtering effect, does not need signal of communication, make last received signal transmission more accurate, avoid the generation of resonance phenomena.
The structure of 3 this patents is simple, and each components and parts are relatively cheap, and low cost of manufacture, volume is little, easy of integration, can widely use.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Embodiment:
The present embodiment comprises: input J1, output J2, active power filtering, passive filtering, active power filtering comprises triode Q1, resistance R4, electric capacity C1, electric capacity C4, resistance R1, amplifier U1, one end of the pin 2 connecting resistance R1 of amplifier U1, one end of resistance R2, one end of another termination capacitor C1 of resistance R1, the emitter of triode Q1, one end of the base stage connecting resistance R4 of triode Q1, one end of electric capacity C4, one end of its collector electrode connecting resistance R4, the pin 2 of input J1, passive filtering comprises resistance R3, resistance R2, electric capacity C3, electric capacity C2, one end of the pin 1 connecting resistance R3 of input J1, one end of electric capacity C3, one end of electric capacity C1, one end of electric capacity C4, one end of electric capacity C2, the pin 3 of amplifier U1, the other end of the other end connecting resistance R3 of electric capacity C3 and ground connection, the pin 1 of another termination amplifier U2 of electric capacity C2, the other end of resistance R2 and meet output J2.
Utilize the technical solution of the utility model, or those skilled in the art being under the inspiration of technical solutions of the utility model, designing similar technical scheme, and reach above-mentioned technique effect, is all fall into protection range of the present utility model.
Claims (3)
1. a filter circuit for efficient filtering, is characterized in that: comprise input J1, output J2, active power filtering, passive filtering, described active power filtering comprises triode Q1, resistance R4, electric capacity C1, electric capacity C4, resistance R1, one end of the pin 2 connecting resistance R1 of amplifier U1, described amplifier U1, one end of resistance R2, one end of another termination capacitor C1 of described resistance R1, the emitter of triode Q1, one end of the base stage connecting resistance R4 of described triode Q1, one end of electric capacity C4, one end of its collector electrode connecting resistance R4, the pin 2 of input J1, described passive filtering comprises resistance R3, resistance R2, electric capacity C3, one end of the pin 1 connecting resistance R3 of electric capacity C2, described input J1, one end of electric capacity C3, one end of electric capacity C1, one end of electric capacity C4, one end of electric capacity C2, the pin 3 of amplifier U1, the other end of the other end connecting resistance R3 of described electric capacity C3 and ground connection, the pin 1 of another termination amplifier U2 of described electric capacity C2, the other end of resistance R2 and meet output J2.
2. the filter circuit of a kind of efficient filtering according to claim 1, is characterized in that: the resistance of described resistance R4 is greater than the resistance of resistance R3.
3. the filter circuit of a kind of efficient filtering according to claim 1, is characterized in that: described triode Q1 selects NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420814895.8U CN204349935U (en) | 2014-12-19 | 2014-12-19 | A kind of filter circuit of efficient filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420814895.8U CN204349935U (en) | 2014-12-19 | 2014-12-19 | A kind of filter circuit of efficient filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349935U true CN204349935U (en) | 2015-05-20 |
Family
ID=53233172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420814895.8U Expired - Fee Related CN204349935U (en) | 2014-12-19 | 2014-12-19 | A kind of filter circuit of efficient filtering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349935U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109147680A (en) * | 2018-09-29 | 2019-01-04 | 京东方科技集团股份有限公司 | A kind of backlight source driving circuit and display device |
-
2014
- 2014-12-19 CN CN201420814895.8U patent/CN204349935U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109147680A (en) * | 2018-09-29 | 2019-01-04 | 京东方科技集团股份有限公司 | A kind of backlight source driving circuit and display device |
| CN109147680B (en) * | 2018-09-29 | 2020-05-05 | 京东方科技集团股份有限公司 | Backlight source drive circuit and display device |
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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 |
Granted publication date: 20150520 Termination date: 20151219 |
|
| EXPY | Termination of patent right or utility model |