CN1066351A - Power line frequency-amplitude cable station - Google Patents
Power line frequency-amplitude cable station Download PDFInfo
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- CN1066351A CN1066351A CN 92102122 CN92102122A CN1066351A CN 1066351 A CN1066351 A CN 1066351A CN 92102122 CN92102122 CN 92102122 CN 92102122 A CN92102122 A CN 92102122A CN 1066351 A CN1066351 A CN 1066351A
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- frequency
- stage
- modulation
- fmam
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Abstract
A kind of power line frequency-amplitude cable station uses on qualified logical broadcasting electrical network.Circuit comprises the converter stage of prestage, frequency modulation modulation lines, raising signal frequency, " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage that change constant amplitude frequency-modulated wave is " FMAM ripple ", frequency divider stage, the power-amplifier stage that reduces signal frequency.Output is served low voltage electric network through coupling isolator, forms the induction of signal field of FMAM ripple.
Description
The invention belongs to wired broadcast system.Power line frequency-amplitude cable station proposes a kind of FMAM ripple transmitter that the constant amplitude frequency-modulated wave is transformed into not only frequency modulation but also amplitude modulation.
At present, power network broadcast does not also have the transmission broadcasting equipment of two kinds of multiple display modes compatibles of FMAM.
The object of the invention provides a kind of power line frequency-amplitude cable station, and the compatible FMAM ripple that it sends can not only receive by power supply network amplitude modulation machine, can receive by the power supply network frequency modulation machine again.
The present invention seeks to realize like this, at first handle low voltage electric network main line end well, make electrical network become the qualified broadcasting electrical network of getting rid of wireless radiation.Power line frequency-amplitude cable station is served low voltage electric network with the FMAM ripple of compatibility.With the electrical network coupling process,, select to use zero method, phase ground method, zero ground method mutually according to the networking situation.When there was electric power compensation electric capacity in electrical network, method was exactly zero ground method mutually.Zero ground method constitutes closed circuit transmission loop with the terminal ground connection of zero line main line.Near electrical network, form FMAM ripple induction of signal field.Frequency adopts low carrier frequency, so do not have the phase shift and the frequency attenuation problem of long line transmission.
The power line frequency-amplitude cable station circuit comprises prestage, the prestage circuit of being made up of two 741 integrated circuits; The frequency modulation modulating stage, the fm modulation circuit of forming by integrated circuit LM566 integrated circuit; Converter stage improves the FM signal frequency, and 3 DG201 form frequency changer circuit by triode; " frequency modulation FMAM " translation circuit, 3 DG201 form translation circuit by triode; Frequency divider stage, LM4060 forms frequency dividing circuit by integrated circuit, again the FM signal frequency is lowered into carrier frequency; Power-amplifier stage, MP1238 forms power amplifier by integrated operational amplifier; Power stage is formed voltage-stabilized power supply circuit by integrated package 7805,7815,7824.Several audio broadcast signals, input frequency modulation modulating stage carries out frequency modulation(FM) with audio signal to carrier frequency after prestage is amplified, and the output fm carrier signal is sent into converter stage raising signal frequency and is sent into " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage again.The utility model center is the FMAM ripple that the constant amplitude frequency-modulated wave is transformed into two kinds of multiple display modes compatibles of not only frequency modulation but also amplitude modulation.The slope discriminator circuit of the approximate FM receiver of translation circuit.(the ratio detector circuit also can be used, later labor circuit, application in addition).To become the FMAM ripple that an amplitude, frequency all change by the modulation signal instantaneous value by the constant amplitude FM signal of modulator input.FM signal from frequency interleaved modulation modulator, after improving signal frequency, converter stage is added to transistor base, collector load is the shunt-resonant circuit that inductance L, capacitor C constitute, select L, C value, make the resonance frequency of the resonant tank of their formations be higher than (or being lower than) FM signal frequency, the FM signal frequency is on the mid point of resonance curve linearity range by the converter stage input.At this moment, the resonant tank both end voltage is directly proportional with frequency, though, input be constant amplitude frequency-modulated wave signal, transistor collector resonant tank both end voltage has been a FMAM signal, to secondary again through frequency divider stage, is lowered into the carrier frequency frequency through transformer coupled.
Frequency divider stage is made up of integrated circuit LM4060, and the high frequency FMAM ripple signal frequency split of importing is become carrier frequency FMAM ripple square-wave signal, through frequency-selective circuit the harmonic wave composition in the square wave is removed again, and frequency-selecting becomes pure sine wave signal, the input power amplifying stage.
The integrated operational amplifier MPC1238 of power-amplifier stage exports after with the power amplification of carrier frequency FMAM sine wave signal.
The power-amplifier stage output signal is served low voltage electric network zero earth-return through coupling isolator, and coupling isolator intercepts 50Hz electric current coupled transfer CF signal.
Owing to adopted such scheme, power line frequency-amplitude cable station just can be carried the FMAM wave carrier signal signal of two kinds of multiple display modes compatibles of not only frequency modulation but also amplitude modulation to qualified broadcasting electrical network.
The present invention is further described below in conjunction with drawings and Examples.
Accompanying drawing 1 power line frequency-amplitude cable station transmitting/receiving system circuit block diagram.
Accompanying drawing 2 power line frequency-amplitude cable station circuit structure block diagrams.
Accompanying drawing 3 power line frequency-amplitude cable station circuit theory diagrams.
Shown in accompanying drawing 1 power line frequency-amplitude cable station transmitting/receiving system circuit block diagram: the end of low voltage electric network zero line main line OO ' adds earth connection O ' D '.Power line frequency-amplitude cable station F output FMAM wave carrier frequency signal is via inductance L, capacitor C, capacitor C
50, inductance L
50, fuse D
XThe coupling isolator of forming is served zero earth-return.C
50, L
50Be the 50Hz shunt-resonant circuit, intercept the 50Hz electric current.Near formation induction of signal field low voltage electric network zero earth-return DOO ' D '.Electrical network AM receiver S in the induction of signal field
AM, electrical network FM receiver S
FMInduction receives the FMAM wave carrier frequency signal.
Shown in accompanying drawing 2 power line frequency-amplitude cable station circuit structure block diagrams: power line frequency-amplitude cable station is made up of prestage 1, frequency modulation modulating stage 2, converter stage 3, " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4, frequency divider stage 5, power-amplifier stage 6, power stage 7.
Audio signal after prestage 1 output is amplified, input frequency modulation modulating stage 2, the carrier frequency input converter stage 3 after the modulation improves input " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4 after the frequency with frequency modulated carrier, the constant amplitude frequency-modulated wave is transformed into FMAM ripple signal, input frequency divider stage 5 carries out frequency division, reduces frequency and becomes carrier frequency, but the carrier frequency of output is a square wave, become sinusoidal wave carrier signal through frequency-selective circuit, input power amplifying stage 6, output FMAM wave carrier frequency signal after the power amplification.Power stage 7 is common voltage-stabilized power supply circuits.
Shown in accompanying drawing 3 power line frequency-amplitude cable station circuit theory diagrams: power line frequency-amplitude cable station prestage 1 is by capacitor C
1-C
6, resistance R
1-R
10; Integrated circuit 741
1, 741
2Form.Three kinds of audio broadcast signals (microphone, phonograph, recording) input 741
12 pin, amplify back 6 pin through integrated circuit 741 and export, through C
65 pin of input frequency interleaved modulation modulator LM566.When binaural signal was imported, left channel signals entered 741
1Right-channel signals enters 741
2, amplify after R
6, C
3And R
18, C
5, R
19, C
6Input frequency interleaved modulation modulator LM566.
Frequency modulation modulating stage 2 is by frequency interleaved modulation modulator LM566 R
20-R
22, C
7-C
9Form.Audio signal enters 5 pin of LM566, in integrated package carrier frequency is carried out the frequency modulation modulation, and fm carrier signal is exported by 3 pin, through C
9Enter converter stage 3.
Converter stage 3 is by triode 3DG201
(1), capacitor C
10-C
14, resistance R
23-R
25, local oscillator transformer B
1, frequency-selecting transformer B
2Form.Because LM566 output carrier frequency frequency is low, and " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4 operating frequency height, so will be through 3 DG201
(1)Frequency conversion, B
2The frequency modulation that frequency-selecting goes out after the frequency conversion enters " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4.
" FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4 is by triode 3 DG201
2Capacitor C
15-C
19, resistance R
26-R
28, frequency-selecting transformer B
2, double tuned circuit B
3Form.
The slope discriminator circuit of " FM-FM frequency modulation-frequency modulation amplitude modulation " translation circuit and FM receiver similar (the ratio detector circuit is also passable, applies in addition later on).To be transformed into the FMAM ripple that an amplitude, frequency all change by the modulation signal instantaneous value by the constant amplitude FM signal of modulator input.Constant amplitude FM signal from converter stage is added to 3 DG201
2Base stage, collector load are double tuned circuit B in parallel
3Inductance L, capacitor C constitute.Select L, C value to make the resonance frequency of the resonant tank of their formations be higher than (or being lower than) constant amplitude FM signal frequency, the FM signal frequency is on the resonant tank curve linear section mid point by the converter stage input.At this moment the resonant tank both end voltage is directly proportional with frequency, though, input be the constant amplitude FM signal, 3 DG201
2Collector electrode resonant tank B
3, both end voltage but has been a FMAM ripple signal.To secondary,, send into frequency divider stage through transformer coupled in order to be lowered into the carrier frequency frequency.
From the FMAM signal of " FM-FM frequency modulation-frequency modulation amplitude modulation " conversion stage 4, in order to be lowered into the carrier frequency frequency, again through C
21After entering 9 pin of LM4060 circuit carrying out 64 frequency divisions in the LM4060 piece, by 6 pin output FMAM CF signal, but output is square-wave signal, again through capacitor C
22Send into frequency-selective circuit B
4, D is the sharpening diode, to the preliminary smothing filtering of square-wave signal.Again through frequency-selective circuit B
4Remove harmonic components, take out pure sine wave.The sinusoidal CF signal of FMAM ripple is through C
24Ingoing power amplifying stage 6.
Power-amplifier stage 6 is by power integrated operational amplifier PC1238, capacitor C
24-C
26, resistance R
30-R
33Form.
FMAM ripple signal is through C
24Enter 1 pin, 5 pin input+15 power supplys of PC1238,3 pin input-15V power supplys, after the power amplification, FMAM wave carrier signal signal is exported by 4 pin.Enter coupling isolator later on and serve zero earth-return.
Power stage 7 is by power transformer T, regulator block 7824,7815,7805, diode D
1-D
10Capacitor C
27-C
38Form common voltage-stabilized power supply circuit.
For FMAM ripple in this circuit, can be for the reception of amplitude modulation machine, detection; Can do some explanation for the feature of frequency modulation machine reception, frequency discrimination again: the slope discriminator syntonizing coil place in the commercially available wireless frequency modulation broadcast receiver can survey the FMAM waveform is shown, as this waveform is sent into the amplitude-modulation receiver detecting circuit, just can detect former audio signal modulation, this just illustrates that the FMAM ripple can receive detection for amplitude modulation; Can receive frequency discrimination for frequency modulation machine again, illustrate that local circuit is feasible.This machine is used for the low voltage electric network handled well by electrical net work broadcasting method, remains problems such as technical solution index, existing standard and radio station scale if be used for high-frequency radio.
Claims (1)
1, use on qualified logical broadcasting electrical network in the wired radio station of a kind of electrical network " frequently--the width of cloth ", and circuit comprises prestage, frequency modulation modulating stage, converter stage, " frequency modulation--FMAM " conversion stage, frequency divider stage, power-amplifier stage, power stage.It is characterized in that: audio frequency amplifies through prestage to be modulated through the frequency modulation modulating stage again, the constant amplitude FM signal improves frequency through converter stage, be transformed into the FMAM ripple through " frequency modulation--FMAM " conversion stage again, again through the frequency divider stage frequency division, become carrier frequency by the frequency-selective circuit frequency-selecting, amplify output through the power amplifier level again and serve low voltage electric network through coupling isolator again, to form the induction of signal field of FMAM ripple.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 92102122 CN1066351A (en) | 1992-03-28 | 1992-03-28 | Power line frequency-amplitude cable station |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 92102122 CN1066351A (en) | 1992-03-28 | 1992-03-28 | Power line frequency-amplitude cable station |
Publications (1)
Publication Number | Publication Date |
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CN1066351A true CN1066351A (en) | 1992-11-18 |
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Application Number | Title | Priority Date | Filing Date |
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CN 92102122 Pending CN1066351A (en) | 1992-03-28 | 1992-03-28 | Power line frequency-amplitude cable station |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102716892A (en) * | 2012-03-12 | 2012-10-10 | 王启庚 | Garbage crushing station apparatus |
CN108540414A (en) * | 2017-03-02 | 2018-09-14 | 杭州萤石网络有限公司 | A kind of modulated signal compatibility method, device and communication system |
-
1992
- 1992-03-28 CN CN 92102122 patent/CN1066351A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102716892A (en) * | 2012-03-12 | 2012-10-10 | 王启庚 | Garbage crushing station apparatus |
CN108540414A (en) * | 2017-03-02 | 2018-09-14 | 杭州萤石网络有限公司 | A kind of modulated signal compatibility method, device and communication system |
CN108540414B (en) * | 2017-03-02 | 2020-12-11 | 杭州萤石网络有限公司 | Modulation signal compatibility method, device and communication system |
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