CN112688718A - Low-voltage direct-current carrier slave communication system based on frequency modulation - Google Patents
Low-voltage direct-current carrier slave communication system based on frequency modulation Download PDFInfo
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Abstract
The invention discloses a frequency modulation-based low-voltage direct current carrier slave communication system, which comprises a transmitter and a receiver, wherein a transmitter frequency generator transmits a generated modulation signal to a signal synthesizer through a band-pass filter; the main control MCU module amplifies the signal through the signal amplifier by controlling the signal synthesizer and then transmits the signal to the direct current coupling circuit, and the direct current coupling circuit transmits the signal to the receiver; the transmitter signal is transmitted to the band-pass filter through a signal amplifier, and the signal is transmitted to the sampling decision device through an envelope demodulator after being filtered by the band-pass filter; the sampling decision device analyzes and compares the signals and transmits the signals to the second main control MCU module to analyze and process the signal information; the second main control MCU module controls the direct current coupling circuit to modulate signal coupling. The invention provides a low-voltage direct-current carrier slave communication system based on frequency modulation, which has long-distance communication transmission, high communication transmission quality and can bear load energy of a slave system.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a low-voltage direct-current carrier slave communication system based on frequency modulation.
Background
At present, digital signals of communication modes such as 485, CAN, RS232 and the like are transmitted through voltage modulation, but because the host communication voltage is low, when the distance between the host and the slave is long and the impedance of a communication line is too large, the voltage amplitude of a communication waveform is greatly attenuated, and long-distance communication cannot be realized. In addition, during long-distance communication and multi-master and slave devices, the impedance of the line is easy to be mismatched, and voltage reflection can be caused, so that voltage waveform generates oscillation, and the identification of long-distance communication signals is very difficult. In addition, the communication can only support the communication function of the master and slave machines, and the master machine cannot provide load energy required by the slave machines.
The Chinese patent application numbers are: 201910482653.0, application date is 04/06/2019, publication date is: 30/07/2019, with patent names: the invention discloses a low-power-consumption close-range half-duplex power supply carrier communication circuit and a communication method, and the communication circuit comprises a first circuit module and a second circuit module, wherein the first circuit module comprises a host end, a direct current power supply and a resistor R1, the second circuit module comprises a slave end, a diode D1 and a capacitor C1, a host MCU communication port of the host end and a slave MCU communication port of the slave end are connected through a communication line, the positive pole of the direct current power supply is connected in parallel with the positive pole end of the power input of the host end and one end of the resistor R1, the other end of the resistor R1 is communicated with one end of the communication line, the other end of the communication line is connected in parallel with the positive pole of a diode D1, the negative pole of a diode D1 is connected in parallel with one end of the capacitor C1 and the other end of the capacitor C1, the power input negative electrode end of the host end and the power input negative electrode end of the slave end are connected with the negative electrode of the direct-current power supply in parallel. The invention can realize time-sharing power supply and half-duplex communication, the whole power consumption of the circuit is low, and the circuit can be used for a long time by using a battery for power supply.
The above patent document discloses a low power consumption close-range half-duplex power carrier communication circuit and a communication method, but the system can only carry out short-range communication transmission, and cannot identify long-range communication signals, and the transmission quality is low, so that the requirement of the development of the times can not be met.
Disclosure of Invention
In view of the above, the present invention provides a low-voltage dc carrier slave communication system based on frequency modulation, which has high communication transmission quality and can bear load energy of a slave system, for long-distance communication transmission.
In order to realize the purpose of the invention, the following technical scheme can be adopted:
a frequency modulation-based low-voltage direct current carrier slave communication system comprises a transmitter and a receiver, wherein the transmitter comprises at least two frequency generators, at least two band-pass filters, a master control MCU module, a signal synthesizer, a signal amplifier, a direct current coupling circuit and a direct current signal power supply;
the frequency generator is used for generating a modulation signal frequency; the band-pass filter is used for filtering frequency noise signals; the master control MCU module is used for analyzing and processing signal information; the signal synthesizer is used for synthesizing signals and selecting corresponding signal frequency information; the signal amplifier is used for amplifying and outputting the modulation signal; the direct current coupling circuit is used for coupling the modulation signals; the direct current signal power supply is used for providing a direct current power supply for the direct current coupling circuit;
the frequency generator transmits the generated modulation signal to a signal synthesizer through a band-pass filter; the main control MCU module amplifies signals through a signal amplifier by controlling the signal synthesizer and then transmits the amplified signals to the direct current coupling circuit, and the direct current coupling circuit transmits the signals to a receiver;
the receiver comprises a signal amplifier, at least two band-pass filters, at least two envelope demodulators, a sampling decision device, a second main control MCU module, a current modulation coupler and a direct-current signal power supply;
the signal amplifier is used for amplifying the signal amplitude; at least two band-pass filters for filtering out frequency signals; at least two envelope demodulators, for demodulating the carrier signal and outputting a digital signal; the sampling decision device is used for analyzing and comparing signals; the second main control MCU module is used for processing and analyzing signal information; the current modulation coupler is used for modulating signal coupling; the direct current signal power supply is used for providing a direct current power supply for the current modulation coupler;
the transmitter signal is amplified by a signal amplifier and transmitted to the band-pass filter, and the signal is transmitted to the sampling decision device through the envelope demodulator after being filtered by the band-pass filter; the sampling decision device analyzes and compares the signals and transmits the signals to the second main control MCU module to analyze and process the signal information; and the second main control MCU module controls the direct current coupling circuit to modulate signal coupling.
The transmitter is a direct current signal transmitter.
The main control MCU module comprises a control switch and a controllable constant current load, and the main control MCU module controls the controllable constant current load through the control switch.
The frequency generator of the transmitter is 2 or 4 or 6, the band pass filters are 2 or 4 or 6, the frequency generator corresponds to the number of the band pass filters, and the frequency generator transmits signals to the band pass filters in a one-to-one correspondence mode.
The band-pass filter is a gaussian filter.
The signal synthesizer comprises a digital decoder, a multi-path analog gating switch and an adder.
The direct current coupling circuit comprises optical coupling or magnetic coupling or direct coupling.
The receiver is a direct current voltage signal receiver.
The number of the band-pass filters of the receiver is 2, 4 or 6, the number of the envelope demodulators is 2, 4 or 6, the number of the band-pass filters corresponds to the number of the envelope demodulators, and the band-pass filters transmit signals to the envelope demodulators in a one-to-one correspondence mode.
The receiver band-pass filter is a Gaussian filter.
The technical scheme provided by the invention has the beneficial effects that:
firstly, the slave communication system can realize long-distance communication transmission, has low transmission attenuation and low line impedance, realizes high quality of long-distance communication transmission signals, and greatly improves the communication transmission quality;
secondly, the slave system of the invention ensures that the waveform of long-distance communication transmission voltage has small oscillation and the signal identification quality is high;
thirdly, the slave system can bear the load energy required by the work, the communication efficiency is greatly improved, and the long-distance communication reliability is greatly enhanced.
Drawings
Fig. 1 is a block diagram of a transmitter system of a slave communication system of a low-voltage dc carrier based on frequency modulation according to an embodiment of the present invention;
fig. 2 is a block diagram of a receiver system of a communication system of a slave device of a low-voltage dc carrier based on fm modulation according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and embodiments thereof.
Example 1
Referring to fig. 1 and fig. 2, the slave communication system based on frequency modulation low-voltage direct current carrier comprises a transmitter and a receiver, wherein the transmitter comprises at least two frequency generators, and in the embodiment, the frequency generators comprise a frequency generator 11, a frequency generator 12, a frequency generator 13 and a frequency generator 14; at least two band-pass filters, in this embodiment, the band-pass filters include a band-pass filter 21, a band-pass filter 22, a band-pass filter 23, and a band-pass filter 24; the main control MCU module 3, the signal synthesizer 4, the signal amplifier 5, the direct current coupling circuit 7 and the direct current signal power supply 6;
the frequency generator 11, the frequency generator 12, the frequency generator 13 and the frequency generator 14 are used for generating modulation signal frequency; the band-pass filter 21, the band-pass filter 22, the band-pass filter 23 and the band-pass filter 24 are used for filtering frequency noise signals; the main control MCU module 3 is used for analyzing and processing signal information; the signal synthesizer 4 is used for synthesizing signals and selecting corresponding signal frequency information; the signal amplifier 5 is used for amplifying and outputting the modulation signal; a direct current coupling circuit 7 for coupling the modulation signal; the direct current signal power supply 6 is used for providing a direct current power supply for the direct current coupling circuit;
the frequency generator 11, the frequency generator 12, the frequency generator 13 and the frequency generator 14 respectively transmit the generated modulation signals to the signal synthesizer 4 through the band-pass filter 21, the band-pass filter 22, the band-pass filter 23 and the band-pass filter 24; the main control MCU module 3 amplifies the signal by controlling the signal amplifier 5 of the signal synthesizer 4, and then transmits the signal to the direct current coupling circuit 7, and the direct current coupling circuit 7 transmits the signal to the receiver;
the receiver comprises a signal amplifier 8 and at least two band-pass filters, wherein the band-pass filters comprise a band-pass filter 91, a band-pass filter 92 and a band-pass filter 93; the system comprises at least two envelope demodulators, a sampling decision device 11, a second main control MCU module 12, a current modulation coupler 13 and a direct current signal power supply 14, wherein the envelope demodulators comprise an envelope demodulator 101, an envelope demodulator 102, an envelope demodulator 103;
the signal amplifier 8 is used for amplifying the signal amplitude; at least two band-pass filters for filtering out frequency signals; at least two envelope demodulators, for demodulating the carrier signal and outputting a digital signal; the sampling decision device 11 is used for analyzing and comparing signals; the second main control MCU module 12 is used for processing and analyzing signal information; the current modulation coupler 13 is used for modulating signal coupling; the direct current signal power supply 14 is used for supplying direct current power to the current modulation coupler 13;
the transmitter signal is amplified by a signal amplifier 8 and transmitted to the band-pass filter, and the signal is transmitted to the sampling decision device 11 through an envelope demodulator after being filtered by the band-pass filter; the sampling decision device 11 analyzes and compares the signals and transmits the signals to the second main control MCU module 13 to analyze and process the signal information; the second master control MCU module 13 controls the current modulation coupler 13 to modulate signal coupling.
In this embodiment, preferably, the transmitter is a direct current signal transmitter; the receiver is a direct current voltage signal receiver.
In this embodiment, the number of the frequency generators may be multiple, and may be set to n; the number of the band pass filters of the transmitter may be plural, and may be n
In this embodiment, the number of the frequency generators of the transmitter is 2, 4 or 6, the number of the band pass filters is 2, 4 or 6, the number of the frequency generators corresponds to the number of the band pass filters, and the frequency generators transmit signals to the band pass filters in a one-to-one correspondence manner; that is, the frequency generator 11, the frequency generator 12, the frequency generator 13, and the frequency generator 14 are 4 frequency generators, and the band pass filter 21, the band pass filter 22, the band pass filter 23, and the band pass filter 24 are also 4 band pass filters; the frequency generator 11, the frequency generator 12, the frequency generator 13 and the frequency generator 14 are respectively in one-to-one correspondence with the band-pass filter 21, the band-pass filter 22, the band-pass filter 23 and the band-pass filter 24; the frequency generator 11, the frequency generator 12, the frequency generator 13, and the frequency generator 14 transmit signals to the band pass filter 21, the band pass filter 22, the band pass filter 23, and the band pass filter 24, respectively.
In this embodiment, the number of the band pass filters of the receiver may be multiple, and may be set to n; the envelope demodulator can be multiple and can be set to be n;
in this embodiment, the number of the receiver band-pass filters is 2, 4, or 6, the number of the envelope demodulators is 2, 4, or 6, the number of the band-pass filters corresponds to the number of the envelope demodulators, and the band-pass filters transmit signals to the envelope demodulators in a one-to-one correspondence manner. That is, the band pass filters 91, 92, 93 are 3 band pass filters; the envelope demodulators 101, 102 and 103 are also 3 envelope demodulators, the band pass filters 91, 92 and 93 are in one-to-one correspondence with the envelope demodulators 101, 102 and 103, and the band pass filters 91, 92 and 93 transmit signals to the envelope demodulators 101, 102 and 103 respectively.
The slave system of the low-voltage direct-current carrier communication system mainly comprises a direct-current transmitter and a direct-current voltage receiver, realizes direct-current voltage communication signal output with a frequency modulation carrier signal, and can receive direct-current communication signal input of a host.
In this embodiment, the frequency generator 11, the frequency generator 12, the frequency generator 13, and the frequency generator 14 are mainly used for generating the frequencies required by the modulation signal (if N frequencies are used, N-ary data transmission can be realized).
The band-pass filter 21, the band-pass filter 22, the band-pass filter 23 and the band-pass filter 24 adopt Gaussian filters, and filter frequency signals generated by the frequency generator according to required frequency points to filter invalid noise frequency signals.
The main control MCU module 3 outputs a digital communication signal s (t) to be modulated.
In this embodiment, the signal synthesizer 4 includes a digital decoder, a plurality of analog gating switches, and an adder. The signal synthesizer 4 receives various frequency information and transmits different frequency information to the multi-channel analog gating switch, the digital decoder decodes the digital signal s (t) output by the MCU, outputs selection information to the corresponding gating switch, selects the corresponding frequency information to pass through, (for example, if the digital signal 2 is received, the frequency information f2 is output by the corresponding analog gating switch), finally superposes the output signals of the multi-channel gating switch through an adder, and outputs the corresponding related frequency information f(s) from the digital communication signal s (t) transmitted by the main control chip in real time.
In this embodiment, the signal amplifier 5 includes an analog signal amplitude amplifier and an analog signal power amplifier for amplifying the amplitude and power of the modulated signal f(s) and outputting f(s).
In this embodiment, the dc signal power supply 6 is mainly responsible for generating a dc carrier voltage, and the output has sufficient load capacity, and can carry a large number of slaves with large power to operate.
In this embodiment, the dc coupling circuit 7 couples the modulated signal f(s) to the dc carrier by means of optical coupling, magnetic coupling, or direct coupling, and finally outputs the dc carrier signal.
In this embodiment, preferably, the main control MCU module 3 includes a control switch 31 and a controllable constant current load 32, and the main control MCU module 3 controls the controllable constant current load 32 through the control switch 31.
In this embodiment, the controllable constant current source may control its own constant current load according to the control signal, and receive the f(s) voltage modulation signal, and then adjust the magnitude of the constant current load according to the following of the modulation signal, thereby implementing the current modulation signal if(s).
The control switch 31 is directly controlled by the main control MCU module 3, and in the idle communication state, the main control MCU module 3 controls the switch 31 to be turned off, so as to turn off the current signal of the controllable constant current load, and in the communication state, the control switch 31 is turned on, and outputs the current signal to the current coupling circuit 12.
In this embodiment, the dc coupling circuit 7 may be connected to the host power input interface through the direct coupling circuit, so as to load the current modulation signal onto the power input line, and finally realize output of the current modulation carrier signal.
Referring to fig. 2, in the present embodiment, the signal amplifier 8 amplifies the signal amplitude of v (fs).
In this embodiment, the band-pass filters 1 to n are gaussian band-pass filters with center frequencies of f1 to fn, and filter frequency signals generated by the frequency generator according to required frequency points, and output filtered frequency information fn(s); (if the frequency modulation information carried by the modulation information does not contain the center frequency of the bandpass filter, fn(s) signal will be close to zero.)
In this embodiment, the envelope demodulators 1 to n are envelope demodulation circuits having center frequencies f1 to fn, respectively, and demodulate the carrier signals corresponding to the center frequencies, remove frequency modulation signal components in the signals, and output digital signals sn (t).
In this embodiment, after receiving the sampling pulse signal, the sampling decision device 11 compares the signal strengths of S1(t) -sn (t) output by the envelope demodulators 1-n, selects a signal Smax with the highest signal strength, and compares the signal Smax with a preset signal lower limit slim; if the signal is lower than Slimit, no signal is input; if the signal is higher than Slimit, the decision device outputs a digital signal S (t); if the signal intensity of S2(t) in S1(t) -SN (t) is strongest and is higher than the preset lower signal limit Slimit at the moment t0, identifying that the digital signal is 2 at the moment; the sampling decision device 11 transmits the output digital signal to the second main control MCU module 12 for processing and analyzing signal information; the second master control MCU module 13 controls the current modulation coupler 13 to modulate signal coupling.
The slave power supply system is mainly used for acquiring the power supply energy of the slave from the input signal of the master V (Fs), and providing power supply for the slave current modulation coupler 12.
The current modulation coupler 12 is a modulation coupling circuit of a slave system current signal transmitter.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A low-voltage direct current carrier slave communication system based on frequency modulation is characterized in that: the transmitter comprises at least two frequency generators, at least two band-pass filters, a master control MCU module, a signal synthesizer, a signal amplifier, a direct current coupling circuit and a direct current signal power supply;
the frequency generator is used for generating a modulation signal frequency; the band-pass filter is used for filtering frequency noise signals; the master control MCU module is used for analyzing and processing signal information; the signal synthesizer is used for synthesizing signals and selecting corresponding signal frequency information; the signal amplifier is used for amplifying and outputting the modulation signal; the direct current coupling circuit is used for modulating signal coupling; the direct current signal power supply is used for providing a direct current power supply for the direct current coupling circuit;
the frequency generator transmits the generated modulation signal to a signal synthesizer through a band-pass filter; the main control MCU module amplifies signals through a signal amplifier by controlling the signal synthesizer and then transmits the amplified signals to the direct current coupling circuit, and the direct current coupling circuit transmits the signals to a receiver;
the receiver comprises a signal amplifier, at least two band-pass filters, at least two envelope demodulators, a sampling decision device, a second main control MCU module, a current modulation coupler and a direct-current signal power supply;
the signal amplifier is used for amplifying the signal amplitude; at least two band-pass filters for filtering out frequency signals; at least two envelope demodulators, for demodulating the carrier signal and outputting a digital signal; the sampling decision device is used for analyzing and comparing signals; the second main control MCU module is used for processing and analyzing signal information; the current modulation coupler is used for modulating signal coupling; the direct current signal power supply is used for providing a direct current power supply for the current modulation coupler;
the transmitter signal is amplified by a signal amplifier and transmitted to the band-pass filter, and the signal is transmitted to the sampling decision device through the envelope demodulator after being filtered by the band-pass filter; the sampling decision device analyzes and compares the signals and transmits the signals to the second main control MCU module to analyze and process the signal information; and the second main control MCU module controls the direct current coupling circuit to modulate signal coupling.
2. A frequency modulation based low voltage dc carrier slave communication system according to claim 1, wherein: the transmitter is a direct current signal transmitter.
3. A frequency modulation based low voltage dc carrier slave communication system according to claim 2, wherein: the main control MCU module comprises a control switch and a controllable constant current load, and the main control MCU module controls the controllable constant current load through the control switch.
4. A frequency modulation based low voltage dc carrier slave communication system according to claim 2, wherein: the frequency generator of the transmitter is 2 or 4 or 6, the band pass filters are 2 or 4 or 6, the frequency generator corresponds to the number of the band pass filters, and the frequency generator transmits signals to the band pass filters in a one-to-one correspondence mode.
5. A frequency modulation-based low-voltage direct current carrier slave communication system according to claim 4, wherein: the band-pass filter is a gaussian filter.
6. A frequency modulation-based low-voltage direct current carrier slave communication system according to claim 5, characterized in that: the signal synthesizer comprises a digital decoder, a multi-path analog gating switch and an adder.
7. A frequency modulation-based low-voltage direct current carrier slave communication system according to claim 6, wherein: the direct current coupling circuit comprises optical coupling or magnetic coupling or direct coupling.
8. A frequency modulation based low voltage dc carrier slave communication system according to claim 1, wherein: the receiver is a direct current voltage signal receiver.
9. A frequency modulation based low voltage dc carrier slave communication system according to claim 7, wherein: the number of the band-pass filters of the receiver is 2, 4 or 6, the number of the envelope demodulators is 2, 4 or 6, the number of the band-pass filters corresponds to the number of the envelope demodulators, and the band-pass filters transmit signals to the envelope demodulators in a one-to-one correspondence mode.
10. A frequency modulation based low voltage dc carrier slave communication system according to claim 9, wherein: the receiver band-pass filter is a Gaussian filter.
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Effective date of registration: 20221212 Address after: 066000 No. 86, Longhai Road, economic and Technological Development Zone, Qinhuangdao City, Hebei Province Patentee after: Qinhuangdao taihe'an Technology Co.,Ltd. Address before: 518000 East, 4th floor, building A1, xinjianxing science and Technology Industrial Park, Fengxin Road, Lou village, Gongming street, Guangming District, Shenzhen City, Guangdong Province Patentee before: TANDA TECHNOLOGY Co.,Ltd. |
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