CN201928242U - Automatic gain control device for power line carrier communication - Google Patents
Automatic gain control device for power line carrier communication Download PDFInfo
- Publication number
- CN201928242U CN201928242U CN2011200597404U CN201120059740U CN201928242U CN 201928242 U CN201928242 U CN 201928242U CN 2011200597404 U CN2011200597404 U CN 2011200597404U CN 201120059740 U CN201120059740 U CN 201120059740U CN 201928242 U CN201928242 U CN 201928242U
- Authority
- CN
- China
- Prior art keywords
- power line
- carrier communication
- frequency amplifier
- line carrier
- 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
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Abstract
The utility model discloses an automatic gain control device for power line carrier communication, comprising a high-frequency amplifier (1). A frequency converter (2) is connected with the high-frequency amplifier (1), three stages of intermediate-frequency amplifiers (3) are sequentially connected with the frequency converter (2), a filter (4) is connected with the third stage intermediate-frequency amplifier (3), a wave detector (5) is connected with the filter (4), an AGC (Automatic Gain Control) magnifier (6) is connected with the wave detector (5), and the AGC magnifier (6) is respectively connected with the first stage intermediate-frequency amplifier (3) and the second stage intermediate-frequency amplifier (3). In the utility model, the automatic gain control device for the power line carrier communication allows the power line carrier communication system to track signals automatically and complete the gain automatic control, so as to improve receiving sensitivity and reduce the influences of the noise on the power line carrier communication system.
Description
Technical field
The utility model relates to a kind of automatic gain control equipment that is used for power line carrier communication, belongs to electrical equipment, circuit arrangement technical field.
Background technology
In power line carrier communication, carrier communication signal receiving module output level size depends on the gain of the level and the receiver module self of input signal, but can be in the practical communication process because a variety of causes causes received signal level to take place than great fluctuation process, especially in China, the power line environment more complicated, the clutter kind that is comprised in the 220V power line is also many, interference to useful signal in the power line carrier communication is also many, cause present equipment can not well intercept useful signal, and existing signal amplification equipment can not be selected the signal frequency of the amplification of wanting voluntarily, causes the amplification effect relatively poor.
Summary of the invention
The technical problems to be solved in the utility model is: the automatic gain control equipment that is used for power line carrier communication of a kind of sensitivity of finishing automatic ride gain, improving received signal, minimizing noise jamming is provided, can overcomes the deficiencies in the prior art.
The technical solution of the utility model is: it comprises high-frequency amplifier, on high-frequency amplifier, be connected with frequency converter, be connected with three grades of intermediate frequency amplifiers on the frequency converter in turn, on the intermediate frequency amplifier of the third level, connect filter, tie geophone on filter, be connected with the AGC amplifier on wave detector, the AGC amplifier is connected with partial intermediate frequency amplifier with the intermediate frequency amplifier of the first order respectively.
Compared with the prior art, the utility model amplifies the high frequency noise signal that receives with high-frequency amplifier, with grade processing to noise signal after an action of the bowels; By the processing of frequency converter, can will extract the signal that comprises clutter of useful carrier communication signal after high-frequency amplifier amplifies; Because the wanted carrier signal amplitude that receives is less, signal a little less than, by the processing of three grades of intermediate frequency amplifiers, carrier signal can satisfy the requirement of wave detector to the input rectified signal; The AGC amplifier changes according to the power of input signal, by its output voltage U
AGCAutomatically finish variable gain amplifier to intermediate frequency amplifier 1() and intermediate frequency amplifier 2(variable gain amplifier) control of gain, when time gain a little less than the input signal raises, gain reduced when input signal was strong.Utilize the automatic gain control equipment of power line carrier communication, can make the power-line carrier communication system automatic tracking signal, finish the automatic control of gain, improve receiving sensitivity, reduce the influence of noise power-line carrier communication system thereby reach.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Embodiment 1: as shown in Figure 1, on high-frequency amplifier 1, be connected with frequency converter 2, on frequency converter 2, be connected with three grades of intermediate frequency amplifiers 3 in turn, on the intermediate frequency amplifier 3 of the third level, connect filter 4, tie geophone 5 on filter 4, be connected with AGC amplifier 6 on wave detector 5, AGC amplifier 6 is connected with partial intermediate frequency amplifier 3 with the intermediate frequency amplifier 3 of the first order respectively.Its process be the signal that receives through high-frequency amplifier 1, the high-frequency signal that comprises clutter that high-frequency amplifier 1 will receive amplifies, with level after an action of the bowels to Signal Processing; By the processing of frequency converter 2, extract in the signal that comprises clutter after the wanted carrier signal of communication can being amplified from high-frequency amplifier 1; Because the carrier signal amplitude that receives is less, signal a little less than, by the processing of three grades of intermediate frequency amplifiers 3, carrier signal can satisfy the requirements of 5 pairs of inputs of wave detector rectified signal; AGC amplifier 6 changes according to the power of input signal, by its output voltage U
AGCAutomatically finish variable gain amplifier to first order intermediate frequency amplifier 3() and second level intermediate frequency amplifier 2(variable gain amplifier) gain control, when time gain a little less than the input signal raises, gain reduced when input signal was strong, finished the automatic control of gain.
Claims (1)
1. automatic gain control equipment that is used for power line carrier communication, it is characterized in that: it comprises high-frequency amplifier (1), on high-frequency amplifier (1), be connected with frequency converter (2), be connected with three grades of intermediate frequency amplifiers (3) on the frequency converter (2) in turn, go up connection filter (4) at the intermediate frequency amplifier (3) of the third level, go up tie geophone (5) at filter (4), be connected with AGC amplifier (6) on wave detector (5), AGC amplifier (6) is connected with partial intermediate frequency amplifier (3) with the intermediate frequency amplifier (3) of the first order respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200597404U CN201928242U (en) | 2011-03-09 | 2011-03-09 | Automatic gain control device for power line carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200597404U CN201928242U (en) | 2011-03-09 | 2011-03-09 | Automatic gain control device for power line carrier communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201928242U true CN201928242U (en) | 2011-08-10 |
Family
ID=44432076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200597404U Expired - Fee Related CN201928242U (en) | 2011-03-09 | 2011-03-09 | Automatic gain control device for power line carrier communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201928242U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071781A (en) * | 2015-09-22 | 2015-11-18 | 浙江方大智控科技有限公司 | Passive selective-frequency filter attenuation receiving circuit |
-
2011
- 2011-03-09 CN CN2011200597404U patent/CN201928242U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071781A (en) * | 2015-09-22 | 2015-11-18 | 浙江方大智控科技有限公司 | Passive selective-frequency filter attenuation receiving circuit |
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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: 20110810 Termination date: 20150309 |
|
| EXPY | Termination of patent right or utility model |