CN103457572A - Second-order active power filter circuit - Google Patents
Second-order active power filter circuit Download PDFInfo
- Publication number
- CN103457572A CN103457572A CN201310407707XA CN201310407707A CN103457572A CN 103457572 A CN103457572 A CN 103457572A CN 201310407707X A CN201310407707X A CN 201310407707XA CN 201310407707 A CN201310407707 A CN 201310407707A CN 103457572 A CN103457572 A CN 103457572A
- Authority
- CN
- China
- Prior art keywords
- amplifier
- resistance
- electric capacity
- filter circuit
- output
- 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.)
- Granted
Links
Images
Landscapes
- Networks Using Active Elements (AREA)
Abstract
The invention discloses a second-order active power filter circuit which comprises operational amplifiers, a variable capacitor, capacitors, resistors and diodes. According to the second-order active power filter circuit, band-stop filtering is adopted to restrain or attenuate signals of a certain frequency band so that all signals outside the frequency band can pass through. The second-order active power filter circuit has strong anti-interference characteristics, and is simple in structure, good in stability and strong in filter capacity.
Description
?
Technical field
The present invention relates to a kind of filter circuit, particularly a kind of second-order active filter circuit.
Background technology
The major function of filter is to transmit useful frequency content in input signal, usually be used as signal processing, data transmission and suppress interference etc. with him on engineering, what the operating frequency of filter circuit was done at present is very high, but, due to the limited bandwidth of integrated transporting discharging, can't carry out filtering to power signal.
Therefore need a kind of new technical scheme to solve the problems referred to above.
Summary of the invention
Goal of the invention: the problem and shortage existed for above-mentioned prior art, the purpose of this invention is to provide a kind of second-order active filter circuit, can effectively suppress the unwanted frequency composition in input signal.
Technical scheme: the technical solution used in the present invention is a kind of second-order active filter circuit, this circuit comprises amplifier, variable capacitance, electric capacity, resistance and diode, the normal phase input end of the first amplifier is as signal input part, its inverting input is by the first grounding through resistance, the output of this first amplifier is by the series connection ground connection of the first electric capacity and the second electric capacity, one end of variable capacitance is connected with the output of the first amplifier, its other end is by the 4th capacity earth, the output of the first amplifier is connected with the normal phase input end of the second amplifier by the series connection of the 5th electric capacity and the 6th electric capacity, and the output of the first amplifier is connected with the normal phase input end of the second amplifier by the series connection of the second resistance and the 3rd resistance, the link of the 5th electric capacity and the 6th electric capacity is connected with an end of rectifier bridge, the link of the second resistance and the 3rd resistance is connected with the other end of rectifier bridge, the other end of this rectifier bridge the 7th capacity earth that was connected, the output of the second amplifier is by the series connection ground connection of the 5th resistance and the 6th resistance, this output is connected with an end of rectifier bridge by the series connection of the 8th electric capacity and the 4th resistance, the inverting input of the second amplifier is by the series connection ground connection of the 9th electric capacity and the 6th resistance.
Preferably, the 4th electric capacity is quartz crystal.
Preferably, rectifier bridge is connected and forms with the negative pole of the second diode by the negative pole of the first diode.
Beneficial effect: compared with prior art, its advantage is that the present invention adopts bandreject filtering in the present invention, suppresses or the signal of a certain frequency range that decays, allow this frequency range all signals in addition pass through, there is very strong noiseproof feature, and circuit structure is simple, good stability, filter capacity is strong.
The accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention includes amplifier, variable capacitance, electric capacity, resistance and diode, the normal phase input end of the first amplifier U1 is as signal input part, its inverting input is by the first resistance R 1 ground connection, the output of this first amplifier U1 is by the series connection ground connection of the first capacitor C 1 and the second capacitor C 2, the end of variable capacitance C3 is connected with the output of the first amplifier U1, its other end is by the 4th capacitor C 4 ground connection, the output of the first amplifier U1 is connected with the normal phase input end of the second amplifier U2 by the series connection of the 5th capacitor C 5 and the 6th capacitor C 6, and the output of the first amplifier U1 is connected with the normal phase input end of the second amplifier U2 by the series connection of the second resistance R 2 and the 3rd resistance R 3, the link of the 5th capacitor C 5 and the 6th capacitor C 6 is connected with an end of rectifier bridge, the link of the second resistance R 2 and the 3rd resistance R 3 is connected with the other end of described rectifier bridge, the other end of this rectifier bridge the 7th capacitor C 7 ground connection that were connected, the output of the second amplifier U2 is by the series connection ground connection of the 5th resistance R 5 and the 6th resistance R 6, this output is connected with an end of rectifier bridge by the series connection of the 8th capacitor C 8 and the 4th resistance R 4, the inverting input of the second amplifier U2 is by the series connection ground connection of the 9th capacitor C 9 and the 6th resistance R 6.
The 4th capacitor C 4 is for adopting quartz crystal, its induction reactance is very large, and capacitive reactance is very little, makes other elements and stray parameter atomic on the impact of frequency of oscillation, so frequency stability is high, rectifier bridge is connected and forms with the negative pole of the second diode D2 by the negative pole of the first diode D1.
The present invention adopts bandreject filtering, suppresses or the signal of a certain frequency range that decays, and allows all signals beyond this frequency range pass through, and have very strong noiseproof feature, and circuit structure is simple, good stability, and filter capacity is strong.
Claims (3)
1. a second-order active filter circuit, it is characterized in that: comprise amplifier, variable capacitance, electric capacity, resistance and diode, the normal phase input end of described the first amplifier (U1) is as signal input part, its inverting input is by the first resistance (R1) ground connection, the output of this first amplifier (U1) is by the series connection ground connection of the first electric capacity (C1) and the second electric capacity (C2), one end of described variable capacitance (C3) is connected with the output of the first amplifier (U1), its other end is by the 4th electric capacity (C4) ground connection, the output of described the first amplifier (U1) is connected with the normal phase input end of the second amplifier (U2) by the series connection of the 5th electric capacity (C5) and the 6th electric capacity (C6), and the output of the first amplifier (U1) is connected with the normal phase input end of the second amplifier (U2) by the series connection of the second resistance (R2) and the 3rd resistance (R3), the link of the 5th electric capacity (C5) and the 6th electric capacity (C6) is connected with an end of rectifier bridge, the link of the second resistance (R2) and the 3rd resistance (R3) is connected with the other end of described rectifier bridge, the other end of this rectifier bridge the 7th electric capacity (C7) ground connection that was connected, the output of described the second amplifier (U2) is by the series connection ground connection of the 5th resistance (R5) and the 6th resistance (R6), this output is connected with an end of rectifier bridge by the series connection of the 8th electric capacity (C8) and the 4th resistance (R4), the inverting input of described the second amplifier (U2) is by the series connection ground connection of the 9th electric capacity (C9) and the 6th resistance (R6).
2. a kind of second-order active filter circuit according to claim 1, it is characterized in that: described the 4th electric capacity (C4) is quartz crystal.
3. a kind of second-order active filter circuit according to claim 1, it is characterized in that: described rectifier bridge comprises the first diode (D1) and the second diode (D2), the negative pole of described the first diode (D1) is connected with the negative pole of the second diode (D2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310407707.XA CN103457572B (en) | 2013-09-10 | 2013-09-10 | A kind of second-order active power filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310407707.XA CN103457572B (en) | 2013-09-10 | 2013-09-10 | A kind of second-order active power filter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103457572A true CN103457572A (en) | 2013-12-18 |
| CN103457572B CN103457572B (en) | 2016-06-08 |
Family
ID=49739613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310407707.XA Expired - Fee Related CN103457572B (en) | 2013-09-10 | 2013-09-10 | A kind of second-order active power filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103457572B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591617A (en) * | 2015-12-17 | 2016-05-18 | 常州大学 | Simple LC chaotic oscillating circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4999522A (en) * | 1987-10-30 | 1991-03-12 | U.S. Philips Corp. | Active RC filter circuit for use as a band-stop filter |
| CN2578825Y (en) * | 2002-11-21 | 2003-10-08 | 河源市雅达电子有限公司 | Detecting alarm devices |
| CN202931258U (en) * | 2012-11-14 | 2013-05-08 | 深圳市振华微电子有限公司 | Biquad band-pass filter circuit and band pass filter |
| CN103137408A (en) * | 2011-11-30 | 2013-06-05 | 中国科学院微电子研究所 | Radio-frequency power supply with precision power detector |
-
2013
- 2013-09-10 CN CN201310407707.XA patent/CN103457572B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4999522A (en) * | 1987-10-30 | 1991-03-12 | U.S. Philips Corp. | Active RC filter circuit for use as a band-stop filter |
| CN2578825Y (en) * | 2002-11-21 | 2003-10-08 | 河源市雅达电子有限公司 | Detecting alarm devices |
| CN103137408A (en) * | 2011-11-30 | 2013-06-05 | 中国科学院微电子研究所 | Radio-frequency power supply with precision power detector |
| CN202931258U (en) * | 2012-11-14 | 2013-05-08 | 深圳市振华微电子有限公司 | Biquad band-pass filter circuit and band pass filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591617A (en) * | 2015-12-17 | 2016-05-18 | 常州大学 | Simple LC chaotic oscillating circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103457572B (en) | 2016-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104536416A (en) | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system | |
| CN103208975A (en) | Matching circuit system | |
| CN204119178U (en) | A kind of intelligent ultra-weak electronic signal low-power consumption filter circuit | |
| CN103457572B (en) | A kind of second-order active power filter circuit | |
| CN102983837A (en) | Bootstrap high-pass filtering circuit | |
| CN107689782B (en) | Filter for inhibiting second harmonic | |
| CN108051671B (en) | Device and method for inhibiting power line conduction emission in wide frequency range | |
| CN206620108U (en) | A kind of new bandstop filter for filtering out Hz noise | |
| EP2773041B1 (en) | A two stage source-follower based filter | |
| CN105765863B (en) | A kind of power amplifier stabilizing circuit and transmitter | |
| CN207039550U (en) | A kind of anti-interference low bit error wave filter | |
| CN203300775U (en) | Weak coupling cavity filter | |
| CN207835421U (en) | Double frequency LC filter circuits | |
| CN102624356B (en) | Narrow-band band-pass filter | |
| CN203368415U (en) | Electric-tuning filter | |
| CN206332149U (en) | Dielectric filter near-end parasitic harmonic wave suppresses structure | |
| CN205945670U (en) | High -order common mode filter circuit and PCB circuit board | |
| CN104506145A (en) | Low-noise small signal amplification circuit and realization method thereof | |
| CN104579194A (en) | High-gain computer network signal amplifier | |
| CN211209677U (en) | Low-pass filter with small dynamic high out-of-band rejection | |
| CN203984365U (en) | A kind of adjustable printed panel transformer | |
| CN203181056U (en) | Novel anti-interference modem | |
| CN202977670U (en) | High-selectivity comb filter | |
| CN202931259U (en) | 4-order trap wave circuit | |
| CN202798611U (en) | Common module filter circuit |
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 | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160810 Address after: 215300 2 building, 3 Feng Feng Road, Zhang Pu town, Suzhou, Jiangsu Patentee after: Kunshan Longshida Electronic Material Co.,Ltd. Address before: Suzhou City, Jiangsu Province, Kunshan City Zhang Pu Feng Zhenjiang Road No. 3 room 2 Patentee before: Kunshan Xinjinfu Precision Electronics Co., Ltd. |
|
| 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: 20160608 Termination date: 20160910 |