CN2792032Y - High-precision narrow-frequency-band power line carrier receiver - Google Patents
High-precision narrow-frequency-band power line carrier receiver Download PDFInfo
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- CN2792032Y CN2792032Y CN 200520011298 CN200520011298U CN2792032Y CN 2792032 Y CN2792032 Y CN 2792032Y CN 200520011298 CN200520011298 CN 200520011298 CN 200520011298 U CN200520011298 U CN 200520011298U CN 2792032 Y CN2792032 Y CN 2792032Y
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- line carrier
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Abstract
The utility model relates to a novel high-precision narrow-band power line carrier receiver, which is suitable for power-line carrier communication devices and other similar devices. The utility model is characterized in that a quartz crystal oscillator (X1) is connected to a signal input point (A) by one end after connected in parallel with a C7, and the other end is connected in series with an R11 and connected to a signal output point (B), so that a first stage high-precision narrow-band frequency selector is jointly formed. Similarly, a quartz crystal oscillator (X2) is connected to a signal input point (C) by one end after connected in parallel with a C8, and the other end is connected in series with an R13 and connected to a signal output point (D), so that a second stage high-precision narrow-band frequency selector is jointly formed. A C6 is connected in series with an R10 and an L2, connected to the point (A), and taken as a pre-frequency selector. A first stage amplifier which is composed of a U1A, U1B, etc., is arranged between the points (B, C), and a second stage amplifier which composed of a U2A, U2B, etc., is arranged after the point (D). The utility model has the excellent performances of narrow pass band, low drift, good selectivity and low insertion loss.
Description
Technical field
The utility model relates to a kind of novel high-precision narrow-band power line carrier receiver, and it is applicable to similar devices such as electric line carrier communication.
Background technology
For the used frequency-selector of this type systematic of electric line carrier communication,, be difficult to select for use quartz-crystal filter because carrier frequency is lower, have to adopt the RC filter, this filter drift is big, and the insertion loss is big, the centre frequency calibration difficulties, because the Q value is low, selectivity is very poor, and passband is very wide, so be easy to be disturbed, error rate height, extremely unreliable.
In the low-tension network carrier communication system, because lead is thick, the network total length is big, so that the width of cloth is penetrated intensity is very big.Have to adopt lower carrier frequency (for example 38KHZ),, reduce power consumption to fall low radiation intensity.The double-T shaped RC filter of the general now employing of frequency-selector in the system in the receiver.This kind filter measured data mean value is as follows:
1. the degree of decay;-40db (designing requirement)
2. passband; Monolateral 410000PPM (400,000=40%/1000000th)
Test condition: the degree of decay-40db
3. insertion loss :-25.5db
Test condition: signal strength=5mV
4. temperature drift: 10000PPM/ ℃ (=1%/℃)
(using, electricity aging each high precision components of 72 hour aging) through excess temperature.
The index of most of electric line carrier communication integrated circuit is the same.The understandable communication quality of such index is very poor! For example in the electric line carrier communication kilowatt meter reading-out system, cause communication utmost point labile state, have a strong impact on system's operation.The examination analyzing failure cause is as follows:
1. main cause is passband too wide (double-side band 800000PPM), disturbs as easy as rolling off a log entering, and causes the error rate too high.
2. it is too big to insert loss, reduces receiving sensitivity.
3. temperature drift is big, and centre frequency is extremely unstable.
Summary of the invention
The purpose of this utility model is to design in order solving the aforementioned problems in the prior that a kind of passband is narrow, drift is extremely low, selectivity is fabulous, to insert the minimum novel high-precision narrow-band power line carrier receiver of loss.
The utility model is realized as follows: quartz oscillator X1 with one terminate to signal input A point after C7 is in parallel, the other end and R11 are connected in series in signal and export the B point, form first order high accuracy narrow-band frequency-selector jointly; Equally, quartz oscillator X2 with one terminate to signal input C point after C8 is in parallel, the other end and R13 are connected in series in signal and export the D point, form second level high accuracy narrow-band frequency-selector jointly; C6 and R10, L2 are connected in series in the A point, as pre-frequency-selector, and the second level amplifier of forming by U2A, U2B etc. after the first order amplifier of forming by U1A, U1B etc. between B point and the C point, D point.
Characteristics of the present utility model are: utilize the high accuracy series connection frequency width of cloth characteristic of quartz oscillator X1, X2, on the unwanted signal frequency, X1, X2 produce a high impedance (tens of approximately M Ω), and the signal voltage ratio of Chuan Lian R11, R13 is very low with it.In other words decay is greatly appearred in unwanted signal frequency (interference signal).Otherwise on the signal frequency (useful signal) of needs, X1, X2 manifest an extremely low impedance (hundreds of approximately Ω), and the signal voltage ratio of Chuan Lian R11, R13 is very high with it.Decay does not appear in signal frequency to needs substantially in other words.This has just reached the purpose of high accuracy frequency-selecting.Because the frequency band extremely narrow (0.38HZ) between the quartz oscillator series and parallel resonance point, so can make the arrowband frequency-selector, but because this frequency band is too narrow, can not avoid the inconsistency of element, thus on quartz oscillator C7 in parallel or C8 in order to broadening passband (the about 5-10HZ of wide logical frequency band range; Be equivalent to 132-263PPM).Owing to the about 10PPM of drift of quartz oscillator, passband is narrow, drift is extremely low, selectivity is fabulous so this frequency-selector has, insert the minimum excellent properties of loss again.
Description of drawings
Fig. 1 is the utility model circuit diagram
Among the figure:
X is that quartz oscillator C is that electric capacity R is a resistance
A and C are the signal input points, and B and D are the signal output points
U amplifies (LF353)
Embodiment
As shown in Figure 1, quartz oscillator X1 with one terminate to signal input A point after C7 is in parallel, the other end and R11 are connected in series in signal and export the B point, form first order high accuracy narrow-band frequency-selector jointly; Equally, quartz oscillator X2 with one terminate to signal input C point after C8 is in parallel, the other end and R13 are connected in series in signal and export the D point, form second level high accuracy narrow-band frequency-selector jointly; C6 and R10, L2 are connected in series in the A point, as pre-frequency-selector; The second level amplifier of forming by U2A, U2B etc. after the first order amplifier of forming by U1A, U1B etc. between B point and the C point, D point.
Claims (1)
1. novel high-precision narrow-band power line carrier receiver, it is characterized in that: quartz oscillator X1 with one terminate to signal input A point after C7 is in parallel, the other end and R11 are connected in series in signal output B point, form first order high accuracy narrow-band frequency-selector jointly; Quartz oscillator X2 with one terminate to signal input C point after C8 is in parallel, the other end and R13 are connected in series in signal and export the D point, form second level high accuracy narrow-band frequency-selector jointly; C6 and R10, L2 are connected in series in the A point, as pre-frequency-selector; The second level amplifier of forming by U2A, U2B after the first order amplifier of forming by U1A, U1B between B point and the C point, D point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520011298 CN2792032Y (en) | 2005-04-01 | 2005-04-01 | High-precision narrow-frequency-band power line carrier receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520011298 CN2792032Y (en) | 2005-04-01 | 2005-04-01 | High-precision narrow-frequency-band power line carrier receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2792032Y true CN2792032Y (en) | 2006-06-28 |
Family
ID=36808077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520011298 Expired - Fee Related CN2792032Y (en) | 2005-04-01 | 2005-04-01 | High-precision narrow-frequency-band power line carrier receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2792032Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611086A (en) * | 2021-08-25 | 2021-11-05 | 曾青龙 | Safety detection system for gas boiler room |
-
2005
- 2005-04-01 CN CN 200520011298 patent/CN2792032Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611086A (en) * | 2021-08-25 | 2021-11-05 | 曾青龙 | Safety detection system for gas boiler room |
| CN113611086B (en) * | 2021-08-25 | 2023-03-28 | 北京欣岳永信热力投资管理有限公司 | Gas boiler room safety detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |