CN106408907B - Dual-mode comprehensive wave trap - Google Patents
Dual-mode comprehensive wave trap Download PDFInfo
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- CN106408907B CN106408907B CN201510466239.2A CN201510466239A CN106408907B CN 106408907 B CN106408907 B CN 106408907B CN 201510466239 A CN201510466239 A CN 201510466239A CN 106408907 B CN106408907 B CN 106408907B
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Abstract
The invention relates to a dual-mode comprehensive wave trap, which comprises a coaxial input end, a first filtering coupling unit, an alternating current power supply filtering unit, a second filtering coupling unit and a coaxial output end, wherein the coaxial input end is used for receiving a first mixed signal containing a first carrier signal and a first wireless radio-frequency signal; the first filtering coupling unit is used for stripping the first carrier signal from the first mixed signal; the alternating current power supply filtering unit is provided with a power supply input end and a power supply output end; the power supply output end is used for inputting the first carrier signal to the carrier wireless dual-mode communication module and outputting a second mixed signal containing a second carrier signal and a second wireless radio-frequency signal sent by the carrier wireless dual-mode communication module; the second filtering coupling unit is used for stripping the second carrier signal from the second mixed signal; the coaxial output end is used for outputting a second carrier signal. The invention solves the problem that the carrier signal and the wireless radio frequency signal in the dual-mode communication centralized meter reading networking are difficult to separate, simplifies the structure of the networking system and reduces the cost.
Description
Technical Field
The invention relates to the technical field of carrier and wireless radio frequency communication, in particular to a dual-mode comprehensive wave trap.
Background
With the development of the large transformation of the national grid, how to solve the problem of the automatic management of the increasingly large power supply network is urgent. The power utilization data are transmitted by using a low-voltage power carrier communication technology, timely and effective collection and statistics are realized, the power supply quality monitoring capability and the management level of a power system are improved, and the method is a preferred scheme recognized at home and abroad at present. The low-voltage power line is the most extensive communication medium network, the ready-made medium is fully used by adopting a proper technology, so that the low-voltage power line carrier meter reading system meets the practical requirement, and the generated economic benefit and the production efficiency are obvious. However, due to the complexity of the low-voltage power grid structure and the serious attenuation of high-frequency signals of the line, in particular, the randomness and the irregularity of various interferences of the power grid, and the distributed capacitance, the distributed inductance, the load property, the load impedance value, the noise and the like of the power grid are all dynamic rather than constant, the power carrier technology has certain limitations. In recent years, with the development of wireless communication technology, a wireless ad hoc network communication mode is adopted, the advantages are very obvious, a communication network is irrelevant to a power utilization environment, the network is stable and reliable, and normal communication faults of other nodes cannot be caused when a single node in the network breaks down. In order to improve the meter reading success rate, two mutually standby communication channels of different communication modes, namely a power line carrier communication mode and a wireless ad hoc network communication mode, are adopted, and the respective advantages of the carrier and the wireless communication are fully combined. By adopting a dual-mode communication centralized meter reading technology, the meter reading success rate reaches 100 percent.
However, in the dual-mode communication centralized meter reading analog communication (i.e., in a laboratory, a field communication environment is simulated by establishing a carrier communication channel and wireless communication, and a carrier signal and a wireless radio frequency signal are correspondingly attenuated, so that the communication performance of the dual-mode communication centralized meter reading system is tested) and an actual communication process, a plurality of user electric meters (or dual-mode collectors) and a concentrator are networked with the plurality of user electric meters, each user electric meter (or dual-mode collector) is used as a slave node in the network, the concentrator is used as a master node in the network, and two communication channels, namely the carrier communication channel and the wireless communication channel, are formed between each node. When reading, the reading controller sends a reading instruction to the concentrator, the concentrator respectively forwards the reading instruction to the user electric meter or the dual-mode collector through the carrier communication channel and the wireless communication channel, and similarly, the reading instruction forwarded between the user electric meters is also respectively forwarded through the carrier communication channel and the wireless communication channel; correspondingly, the user ammeter or the dual-mode collector responds to the reading instruction, corresponding reading data are uploaded to the concentrator respectively through the carrier communication channel and the wireless communication channel, and then uploaded to the reading controller through the concentrator, and reading can be completed.
That is to say, because a dual-mode communication technology is adopted, the reading instruction forwarded by the concentrator and the user electric meter (or the dual-mode collector) and the reading data uploaded by the user electric meter are respectively carried out in two modes of a carrier signal and a wireless radio frequency signal, so that the power line carrier and wireless ad hoc network dual-mode communication reading is realized.
Therefore, for the carrier signal and the wireless radio frequency signal sent by the carrier wireless dual-mode communication module in the electric meter, a set of complex lines need to be designed to separate the carrier signal from the wireless radio frequency signal, so as to form an independent analog channel, and the analog line has a complex structure, high cost and inconvenient maintenance.
Disclosure of Invention
The present invention provides a dual-mode comprehensive wave trap, which overcomes the above-mentioned shortcomings in the prior art.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows: a dual-mode synthetic wave trap comprising:
a coaxial input for receiving a first mixed signal comprising a first carrier signal and a first radio frequency signal;
a first filtering coupling unit, an input end of the first filtering coupling unit is connected with the coaxial input end, and is used for stripping the first carrier signal from the first mixed signal;
the alternating current power supply filtering unit is provided with a power supply input end used for connecting an alternating current power supply and a power supply output end connected with the carrier wireless dual-mode communication module; the power supply output end is connected with the output end of the first filtering coupling unit and used for inputting the first carrier signal to the carrier wireless dual-mode communication module and outputting a second mixed signal which is sent by the carrier wireless dual-mode communication module and contains a second carrier signal and a second wireless radio frequency signal;
the input end of the second filtering coupling unit is connected with the power supply output end and is used for stripping the second carrier signal from the second mixed signal;
and the coaxial output end is connected with the output end of the second filtering coupling unit and used for outputting the second carrier signal.
Preferably, the first filtering coupling unit includes:
the first filtering module is connected with the coaxial input end and is used for carrying out primary filtering on the first mixed signal;
the first coupling transformer is connected with the first filtering module and is used for coupling the first mixed signal after primary filtering;
and the second filtering module is connected with the first coupling transformer and is used for carrying out secondary filtering on the coupled first mixed signal so as to filter the first wireless radio-frequency signal and separate out the first carrier signal.
Preferably, the first filtering module includes a first filtering capacitor and a first zener diode, one end of the first filtering capacitor is connected to the positive electrode of the coaxial input terminal, the other end of the first filtering capacitor is connected to one end of the first zener diode, and the other end of the first zener diode is connected to the negative electrode of the coaxial input terminal;
the one end of the first zener diode is connected to one end of the primary coil of the first coupling transformer, and the other end of the first zener diode is connected to the other end of the primary coil of the first coupling transformer.
Preferably, the second filter module includes a first inductor, a second filter capacitor, and a first resistor, one end of the first inductor is connected to one end of the secondary winding of the first coupling transformer, the other end of the first inductor is connected to one end of the second filter capacitor and one end of the first resistor, the other end of the second filter capacitor and the other end of the first resistor are connected to the positive electrode of the power output terminal, and the other end of the secondary winding of the first coupling transformer is connected to the negative electrode of the power output terminal.
Preferably, the second filtering coupling unit includes:
the third filtering module is connected with the power output end and is used for carrying out primary filtering on the second mixed signal;
the second coupling transformer is connected with the third filtering module and is used for coupling the second mixed signal after primary filtering;
and the fourth filtering module is connected with the second coupling transformer and is used for carrying out secondary filtering on the coupled second mixed signal so as to filter the second wireless radio frequency signal, separate out the second carrier signal and output the second carrier signal to the coaxial output end.
Preferably, the third filter module includes a second inductor, a third filter capacitor and a second resistor, one end of the second inductor is connected to one end of the secondary coil of the second coupling transformer, the other end of the second inductor is connected to one end of the third filter capacitor and one end of the second resistor, the other end of the third filter capacitor and the other end of the second resistor are connected to the positive electrode of the power output terminal, and the other end of the secondary coil of the second coupling transformer is connected to the negative electrode of the power output terminal.
Preferably, the fourth filtering module includes a fourth filtering capacitor and a second zener diode, one end of the fourth filtering capacitor is connected to the positive electrode of the coaxial output terminal, the other end of the fourth filtering capacitor is connected to one end of the second zener diode, and the other end of the second zener diode is connected to the negative electrode of the coaxial output terminal;
the one end of the second zener diode is connected to one end of the primary coil of the second coupling transformer, and the other end of the second zener diode is connected to the other end of the primary coil of the second coupling transformer.
Preferably, the ac power filtering unit includes:
the fifth filtering module is connected with the power supply input end and is used for filtering input alternating current for the first time;
the common mode choke coil is connected with the fifth filtering module and used for filtering electromagnetic interference in the alternating current;
and the sixth filtering module is connected with the common mode choke coil and is used for carrying out secondary filtering on the alternating current to form stable alternating current.
Preferably, the fifth filtering module includes a fifth filtering capacitor, one end of the fifth filtering capacitor is connected to the positive electrode of the power input end, and the other end of the fifth filtering capacitor is connected to the negative electrode of the power input end;
one end of one coil of the common mode choke coil is connected to the one end of the fifth filter capacitor, and one end of the other coil of the common mode choke coil is connected to the other end of the fifth filter capacitor.
Preferably, the sixth filter module includes a sixth filter capacitor, a third coil, a fourth coil and a seventh filter capacitor, one end of the sixth filter capacitor is connected to the other end of the one coil of the common mode choke coil, and the other end of the sixth filter capacitor is connected to the other end of the other coil of the common mode choke coil;
one end of the third coil is connected with one end of the sixth filter capacitor, the other end of the third coil is connected with one end of the seventh filter capacitor and the anode of the power output end, one end of the fourth coil is connected with the other end of the sixth filter capacitor, and the other end of the fourth coil is connected with the other end of the seventh filter capacitor and the cathode of the power output end.
The dual-mode comprehensive wave trap provided by the invention has the advantages that the coaxial input end is accessed into the first mixed signal, the first filtering coupling unit can be used for coupling the first carrier signal in the first mixed signal and filtering the first wireless radio frequency signal, so that the first wireless radio frequency signal in the first mixed signal can be filtered out, the first carrier signal is further separated, and the separated first carrier signal is input to the carrier wireless dual-mode communication module through the power output end of the alternating current power supply filtering unit; correspondingly, the second mixed signal output by the carrier wireless dual-mode communication module can couple the second carrier signal in the second mixed signal through the second filtering coupling unit to filter the second wireless radio frequency signal, so that the second wireless radio frequency signal in the second mixed signal is first filtered, and the second carrier signal is further separated. Therefore, the problem that carrier signals and wireless radio frequency signals in the dual-mode communication centralized meter reading networking are difficult to separate is solved. In addition, the dual-mode comprehensive wave trap of the invention separates the carrier signal from the wireless radio frequency signal, thereby simplifying the structure of the analog networking system and greatly reducing the system cost.
Drawings
FIG. 1 is a block diagram of a dual-mode synthetic wave trap according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a dual-mode integrated trap according to an embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, an embodiment of the present invention provides a dual-mode comprehensive wave trap, which includes a coaxial input terminal 11, a first filtering coupling unit 10, an ac power filtering unit 20, a second filtering coupling unit 30, and a coaxial output terminal 31.
Specifically, the coaxial input terminal 11 is configured to receive a first mixed signal including a first carrier signal and a first radio frequency signal. The first mixed signal is generally a signal sent by a previous node (a user electric meter or a dual-mode collector) in the network after being attenuated by the simulated carrier communication channel and the wireless communication channel, and therefore, the coaxial input end 11 is generally connected with the output ends of the simulated carrier communication channel and the wireless communication channel between the previous node and the current node. The carrier frequency point center frequency of the carrier signal is preferably: 150KHz-500KHz, the wireless radio frequency center frequency of the wireless radio frequency signal is preferably: 400MHz-800 MHz.
The input of the first filtering and coupling unit 10 is connected to the coaxial input 11 for stripping the first carrier signal from the first mixed signal. That is to say, the first filtering and coupling unit 10 has a coupling effect on the first carrier signal in the first mixed signal, and has a wave-blocking effect on the first wireless rf signal in the first mixed signal, so that the first carrier signal can be separated from the power line after the first mixed signal enters the first filtering and coupling unit 10.
The ac power filter unit 20 has a power input terminal 21 for connecting an ac power and a power output terminal 22 for connecting a carrier wireless dual-mode communication module. The power output terminal 22 is connected to the output terminal of the first filtering coupling unit, and is used for inputting the first carrier signal to the carrier wireless dual-mode communication module, and outputting a second mixed signal containing a second carrier signal and a second wireless radio frequency signal to the carrier wireless dual-mode communication module.
The carrier wireless dual-mode communication module is a communication unit in a user electric meter (or a dual-mode collector), that is, on one hand, the power output end 22 is connected to the user electric meter (or the dual-mode collector) and is configured to filter the alternating current accessed by the power input end 21 to form stable alternating current to supply power to the user electric meter (or the dual-mode collector). On the other hand, the power output end 22 is connected to the output end of the first filtering and coupling unit, and is configured to load the first carrier signal separated by the first filtering and coupling unit to the power output end 22, transmit the first carrier signal to the carrier wireless dual-mode communication module in the user electric meter (or dual-mode collector) through the power line, and finally output the first carrier signal to the user electric meter (or dual-mode collector) through the carrier wireless dual-mode communication module. On the other hand, the second mixed signal sent by the carrier wireless dual-mode communication module to the user electric meter (or the dual-mode collector) can be loaded onto the power line through the power output terminal 22.
An input of the second filtering and coupling unit 30 is connected to the power supply output 22 for stripping the second carrier signal from the second mixed signal. That is to say, for the second mixed signal sent by the user electricity meter (or the dual-mode collector) through the carrier wireless dual-mode communication module, the carrier signal can be separated through the second filtering and coupling unit 30, specifically, the second filtering and coupling unit 30 has a coupling effect on the second carrier signal in the second mixed signal, and has a wave blocking effect on the second wireless radio frequency signal in the second mixed signal, so that after the second mixed signal enters the second filtering and coupling unit 30, the second carrier signal therein can be separated from the power line.
The coaxial output terminal 31 is connected to the output terminal of the second filtering and coupling unit 30 for outputting the second carrier signal. The coaxial output 31 is typically connected to the input of analog carrier and wireless communication channels between the current node and the next node.
In other words, the first filtering and coupling unit 10 is configured to separate the first mixed signal sent by the previous node to the current node to separate a first carrier signal, load the first carrier signal to the power line through the power output end 22 of the ac power filtering unit 20, and finally transmit the first carrier signal to the current node; the second filtering and coupling unit 30 is used for separating the second mixed signal sent from the current node to the next node to separate out the second carrier signal, and then outputting the second carrier signal to the next node through the coaxial output terminal 31.
According to the dual-mode comprehensive wave trap provided by the embodiment of the invention, the coaxial input end 11 is connected to the first mixed signal, the first filtering coupling unit 10 can couple the first carrier signal in the first mixed signal and filter the first wireless radio frequency signal, so that the first wireless radio frequency signal in the first mixed signal can be filtered out, the first carrier signal is further separated, and the separated first carrier signal is input to the carrier wireless dual-mode communication module through the power output end 22 of the alternating current power supply filtering unit 20; correspondingly, the second mixed signal output by the carrier wireless dual-mode communication module may couple the second carrier signal in the second mixed signal through the second filtering coupling unit 30 to filter the second wireless radio frequency signal, so as to first filter the second wireless radio frequency signal in the second mixed signal, and further separate the second carrier signal. Therefore, the problem that carrier signals and wireless radio frequency signals in the dual-mode communication centralized meter reading networking are difficult to separate is solved. In addition, the dual-mode comprehensive wave trap of the invention separates the carrier signal from the wireless radio frequency signal, thus simplifying the structure of a networking system and greatly reducing the system cost.
Referring to fig. 2, in an embodiment of the present invention, the first filtering coupling unit 10 includes a first filtering module 101, a first coupling transformer 102, and a second filtering module 103.
The first filtering module 101 is connected to the coaxial input terminal 11 for performing a first filtering on the first mixed signal. The first coupling transformer 102 is connected to the first filtering module 101, and is configured to couple the first mixed signal after the first filtering; the second filtering module 103 is connected to the first coupling transformer 102, and is configured to perform secondary filtering on the coupled first mixed signal to filter the first radio frequency signal and separate a first carrier signal.
That is to say, the first filtering module 101 and the second filtering module 103 have a wave blocking function on the first radio frequency signal in the first mixed signal, the first mixed signal accessed by the coaxial input terminal 11 is subjected to primary filtering, coupling of the first coupling transformer 102 and secondary filtering of the second filtering module 103 by the first filtering module 101, so that the first radio frequency signal in the first mixed signal can be completely filtered, and the first carrier signal in the first mixed signal can be coupled to the power output terminal 22 of the ac power filtering unit 20. The first filtering and coupling unit 10 used in this embodiment can completely separate the first carrier signal from the first wireless rf signal, thereby ensuring the stability and reliability of the carrier communication channel.
More specifically, in an embodiment of the present invention, the first filtering module 101 may include a first filtering capacitor C1 and a first zener diode D1, one end of the first filtering capacitor C1 is connected to the anode of the coaxial input end 11, the other end of the first filtering capacitor C1 is connected to one end of the first zener diode D1, and the other end of the first zener diode D1 is connected to the cathode of the coaxial input end 11. One terminal of the first zener diode D1 is connected to one terminal of the primary coil of the first coupling transformer 102, and the other terminal of the first zener diode D1 is connected to the other terminal of the primary coil of the first coupling transformer 102. Thus, the first filtering module 101 formed by the first filtering capacitor C1 and the first zener diode D1 can filter the first radio frequency signal once, and the first carrier signal can pass through.
Correspondingly, the second filtering module 103 may include a first inductor L1, a second filtering capacitor C2 and a first resistor R1, one end of the first inductor L1 is connected to one end of the secondary winding of the first coupling transformer 102, the other end of the first inductor L1 is connected to one end of the second filtering capacitor C2 and one end of the first resistor R1, the other end of the second filtering capacitor C2 and the other end of the first resistor R1 are connected to the positive pole of the power output terminal 22, and the other end of the secondary winding of the first coupling transformer 102 is connected to the negative pole of the power output terminal 22. Thus, the second filtering module 103 composed of the first inductor L1, the second filtering capacitor C2 and the first resistor R1 can filter the first radio frequency signal for the second time, completely filter the first radio frequency signal in the first mixed signal, and couple the first carrier signal in the first mixed signal to the power output end 22 of the ac power filtering unit 20.
Referring to fig. 2, in an embodiment of the present invention, the second filtering coupling unit 30 includes a third filtering module 301, a second coupling transformer 302 and a fourth filtering module 303.
The third filtering module 301 is connected to the power output terminal 22 for performing a first filtering on the second mixed signal. The second coupling transformer 302 is connected to the third filtering module 301, and is configured to couple the once-filtered second mixed signal. The fourth filtering module 303 is connected to the second coupling transformer 302, and is configured to perform secondary filtering on the coupled second mixed signal to filter the second wireless rf signal, separate out a second carrier signal, and output the second carrier signal to the coaxial output terminal 31.
That is to say, the third filtering module 301 and the fourth filtering module 303 have a wave blocking effect on the second radio frequency signal in the second mixed signal output by the power output terminal 22, the second mixed signal output by the power output terminal 22 is subjected to primary filtering by the third filtering module 301, coupling by the second coupling transformer 302, and secondary filtering by the fourth filtering module 303, so that the second radio frequency signal in the second mixed signal can be completely filtered, and the second carrier signal in the second mixed signal can be coupled to the coaxial output terminal 31. The second filtering and coupling unit 30 used in this embodiment can completely separate the second carrier signal from the second radio frequency signal, thereby ensuring the stability and reliability of the carrier communication channel.
More specifically, in an embodiment of the present invention, the third filtering module 301 may include a second inductor L2, a third filtering capacitor C3 and a second resistor R2, one end of the second inductor L2 is connected to one end of the secondary winding of the second coupling transformer 302, the other end of the second inductor L2 is connected to one end of the third filtering capacitor C3 and one end of the second resistor R2, the other end of the third filtering capacitor C3 and the other end of the second resistor R2 are connected to the positive pole of the power output terminal 22, and the other end of the secondary winding of the second coupling transformer 302 is connected to the negative pole of the power output terminal 22. In this way, the third filtering module 301 composed of the second inductor L2, the third filtering capacitor C3 and the second resistor R2 can filter the second radio frequency signal once.
Correspondingly, the fourth filtering module 303 may include a fourth filtering capacitor C4 and a second zener diode D2, one end of the fourth filtering capacitor C4 is connected to the anode of the coaxial output terminal 31, the other end of the fourth filtering capacitor C4 is connected to one end of the second zener diode D2, and the other end of the second zener diode D2 is connected to the cathode of the coaxial output terminal 31. The one terminal of the second zener diode D2 is connected to one terminal of the primary coil of the second coupling transformer 302, and the other terminal of the second zener diode D2 is connected to the other terminal of the primary coil of the second coupling transformer 302. Thus, the second rf signal can be filtered again by the fourth filtering module 303 composed of the fourth filtering capacitor C4 and the second zener diode D2, so as to completely filter the second rf signal in the second mixed signal, and couple the second carrier signal in the second mixed signal to the coaxial output terminal 31.
Referring to fig. 2, in an embodiment of the present invention, the ac power filtering unit 20 includes a fifth filtering module 201, a common mode choke 202, and a sixth filtering module 203.
The fifth filtering module 201 is connected to the power input terminal 21 for performing primary filtering on the input ac power. The common mode choke 202 is connected to the fifth filtering module 201 for filtering out electromagnetic interference in the alternating current. The sixth filtering module 203 is connected to the common-mode choke 202 for performing secondary filtering on the alternating current to form a stable alternating current.
That is to say, in this embodiment, the ac power filtering unit 20 adopts an EMI filtering unit, the ac power accessed by the power input terminal 21 is firstly filtered by the fifth filtering module 201, then the common mode choke 202 suppresses the electromagnetic interference, and finally the sixth filtering module 203 is used for secondary filtering to finally form stable ac power which is output from the power output terminal 22 to supply power to the user electric meter (or the dual-mode collector).
It should be noted that, the first filtering and coupling unit 10 and the second filtering and coupling unit 30 are connected to the power output terminal 22 of the ac power filtering unit 20, and the first carrier signal separated by the first filtering and coupling unit 10 is coupled to the power output terminal 22 and directly output to the user electricity meter (or the dual-mode collector) from the power output terminal 22; and the second mixed signal sent by the user electric meter (or the dual-mode collector) is directly loaded to the second filtering and coupling unit 30 through the power output terminal 22. That is, the ac power filter unit 20 is used only for supplying power, and is not used as a carrier signal transmission carrier. Therefore, the separation of the carrier signal and the power frequency signal can be realized, and the signal crosstalk is avoided.
More specifically, in an embodiment of the present invention, the fifth filter module 201 may include a fifth filter capacitor C5, one end of the fifth filter capacitor C5 is connected to the positive pole of the power input terminal 21, and the other end of the fifth filter capacitor C5 is connected to the negative pole of the power input terminal 21. One end of one coil of the common mode choke coil 202 is connected to one end of a fifth filter capacitor C5, and one end of the other coil of the common mode choke coil 202 is connected to the other end of the fifth filter capacitor C5. In this way, the fifth filter capacitor C5 can perform primary filtering on the ac power inputted from the power input terminal 21, and perform anti-electromagnetic interference processing through the common mode choke coil 202.
Correspondingly, the sixth filter module 203 includes a sixth filter capacitor C6, a third coil L3, a fourth coil L4 and a seventh filter capacitor C6, wherein one end of the sixth filter capacitor C6 is connected to the other end of one coil of the common mode choke coil 202, and the other end of the sixth filter capacitor C6 is connected to the other end of the other coil of the common mode choke coil 202.
One end of the third coil L3 is connected to one end of the sixth filter capacitor C6, the other end of the third coil L3 is connected to one end of the seventh filter capacitor C7 and the positive electrode of the power output terminal 22, one end of the fourth coil L4 is connected to the other end of the sixth filter capacitor C6, and the other end of the fourth coil L4 is connected to the other end of the seventh filter capacitor C7 and the negative electrode of the power output terminal 22.
In this way, the sixth smoothing module 203 composed of the sixth smoothing capacitor C6, the third coil L3, the fourth coil L4 and the seventh smoothing capacitor C7 can perform secondary smoothing on the alternating current to form a stable alternating current.
In summary, in the dual-mode comprehensive wave trap provided by the present invention, the coaxial input end 11 is connected to the first mixed signal, and the first filtering and coupling unit 10 can couple the first carrier signal in the first mixed signal and filter the first wireless radio frequency signal, so that the first wireless radio frequency signal in the first mixed signal can be filtered out, and the first carrier signal is separated, and the separated first carrier signal is input to the carrier wireless dual-mode communication module through the power output end 22 of the ac power filtering unit 20; correspondingly, the second mixed signal output by the carrier wireless dual-mode communication module may couple the second carrier signal in the second mixed signal through the second filtering coupling unit 30 to filter the second wireless radio frequency signal, so as to first filter the second wireless radio frequency signal in the second mixed signal, and further separate the second carrier signal. Therefore, the problem that carrier signals and wireless radio frequency signals in the dual-mode communication centralized meter reading networking are difficult to separate is solved. In addition, the dual-mode comprehensive wave trap of the invention separates the carrier signal from the wireless radio frequency signal, thus simplifying the structure of a networking system and greatly reducing the system cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A dual-mode synthetic wave trap, comprising:
a coaxial input for receiving a first mixed signal comprising a first carrier signal and a first radio frequency signal;
a first filtering coupling unit, an input end of the first filtering coupling unit is connected with the coaxial input end, and is used for stripping the first carrier signal from the first mixed signal;
the alternating current power supply filtering unit is provided with a power supply input end used for connecting an alternating current power supply and a power supply output end connected with the carrier wireless dual-mode communication module; the power supply output end is connected with the output end of the first filtering coupling unit and used for inputting the first carrier signal to the carrier wireless dual-mode communication module and outputting a second mixed signal which is sent by the carrier wireless dual-mode communication module and contains a second carrier signal and a second wireless radio frequency signal;
the input end of the second filtering coupling unit is connected with the power supply output end and is used for stripping the second carrier signal from the second mixed signal;
and the coaxial output end is connected with the output end of the second filtering coupling unit and used for outputting the second carrier signal.
2. The dual-mode synthesis trap of claim 1, wherein the first filtering coupling unit comprises:
the first filtering module is connected with the coaxial input end and is used for carrying out primary filtering on the first mixed signal;
the first coupling transformer is connected with the first filtering module and is used for coupling the first mixed signal after primary filtering;
and the second filtering module is connected with the first coupling transformer and is used for carrying out secondary filtering on the coupled first mixed signal so as to filter the first wireless radio-frequency signal and separate out the first carrier signal.
3. The dual-mode integrated wave trap of claim 2, wherein the first filtering module comprises a first filtering capacitor and a first zener diode, one end of the first filtering capacitor is connected to the positive pole of the coaxial input terminal, the other end of the first filtering capacitor is connected to one end of the first zener diode, and the other end of the first zener diode is connected to the negative pole of the coaxial input terminal;
the one end of the first zener diode is connected to one end of the primary coil of the first coupling transformer, and the other end of the first zener diode is connected to the other end of the primary coil of the first coupling transformer.
4. The dual-mode integrated wave trap of claim 2, wherein the second filtering module comprises a first inductor, a second filtering capacitor, and a first resistor, one end of the first inductor is connected to one end of the secondary winding of the first coupling transformer, the other end of the first inductor is connected to one end of the second filtering capacitor and one end of the first resistor, the other end of the second filtering capacitor and the other end of the first resistor are connected to the positive electrode of the power output terminal, and the other end of the secondary winding of the first coupling transformer is connected to the negative electrode of the power output terminal.
5. The dual-mode synthesis trap of claim 1, wherein the second filtering coupling unit comprises:
the third filtering module is connected with the power output end and is used for carrying out primary filtering on the second mixed signal;
the second coupling transformer is connected with the third filtering module and is used for coupling the second mixed signal after primary filtering;
and the fourth filtering module is connected with the second coupling transformer and is used for carrying out secondary filtering on the coupled second mixed signal so as to filter the second wireless radio frequency signal, separate out the second carrier signal and output the second carrier signal to the coaxial output end.
6. The dual-mode integrated wave trap of claim 5, wherein the third filtering module comprises a second inductor, a third filtering capacitor and a second resistor, one end of the second inductor is connected to one end of the secondary winding of the second coupling transformer, the other end of the second inductor is connected to one end of the third filtering capacitor and one end of the second resistor, the other end of the third filtering capacitor and the other end of the second resistor are connected to the positive electrode of the power output terminal, and the other end of the secondary winding of the second coupling transformer is connected to the negative electrode of the power output terminal.
7. The dual-mode integrated wave trap of claim 5, wherein the fourth filtering module comprises a fourth filtering capacitor and a second zener diode, one end of the fourth filtering capacitor is connected to the positive pole of the coaxial output terminal, the other end of the fourth filtering capacitor is connected to one end of the second zener diode, and the other end of the second zener diode is connected to the negative pole of the coaxial output terminal;
the one end of the second zener diode is connected to one end of the primary coil of the second coupling transformer, and the other end of the second zener diode is connected to the other end of the primary coil of the second coupling transformer.
8. The dual-mode integrated wave trap of claim 1, wherein the ac power filtering unit comprises:
the fifth filtering module is connected with the power supply input end and is used for filtering input alternating current for the first time;
the common mode choke coil is connected with the fifth filtering module and used for filtering electromagnetic interference in the alternating current;
and the sixth filtering module is connected with the common mode choke coil and is used for carrying out secondary filtering on the alternating current to form stable alternating current.
9. The dual-mode integrated wave trap of claim 8, wherein the fifth filtering module comprises a fifth filtering capacitor, one end of the fifth filtering capacitor is connected to the positive electrode of the power input terminal, and the other end of the fifth filtering capacitor is connected to the negative electrode of the power input terminal;
one end of one coil of the common mode choke coil is connected to the one end of the fifth filter capacitor, and one end of the other coil of the common mode choke coil is connected to the other end of the fifth filter capacitor.
10. The dual-mode integrated wave trap of claim 9, wherein the sixth filtering module comprises a sixth filtering capacitor, a third coil, a fourth coil and a seventh filtering capacitor, one end of the sixth filtering capacitor is connected to the other end of the one coil of the common mode choke, and the other end of the sixth filtering capacitor is connected to the other end of the other coil of the common mode choke;
one end of the third coil is connected with one end of the sixth filter capacitor, the other end of the third coil is connected with one end of the seventh filter capacitor and the anode of the power output end, one end of the fourth coil is connected with the other end of the sixth filter capacitor, and the other end of the fourth coil is connected with the other end of the seventh filter capacitor and the cathode of the power output end.
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