CN112003802A - Coding system and method using reactive current pulse - Google Patents
Coding system and method using reactive current pulse Download PDFInfo
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- CN112003802A CN112003802A CN202010565932.6A CN202010565932A CN112003802A CN 112003802 A CN112003802 A CN 112003802A CN 202010565932 A CN202010565932 A CN 202010565932A CN 112003802 A CN112003802 A CN 112003802A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
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Abstract
The invention discloses a coding system and a coding method using reactive current pulses, wherein the coding system comprises a signal generating device, a reactive current generating device, a collecting device and a coding device; the signal generating device is connected with the reactive current generating device and is used for outputting PWM signals; the reactive current generating device is connected with the collecting device; the collecting device is connected with the coding device; the encoding device performs binary encoding by means of reactive current pulses, the method comprising the steps of: step S1: setting parameters of the PWM signal and the on-off frequency of the switch module; step S2: the acquisition device acquires the reactive current pulse signal and outputs a oscillogram thereof; step S3: taking the absolute value of the 1/4 period value according to the waveform diagram; step S4: binary encoding according to the value of step S3; the invention not only enables the reactive current to have a basic communication function, but also can develop related advanced applications, thereby effectively making up the defects of micropower wireless and power line carrier in the aspect of topology identification.
Description
Technical Field
The invention relates to the technical field of coding, in particular to a coding system and a coding method applying reactive current pulses.
Background
The existing micropower wireless can realize the function of topology identification in a disciplinary environment, but in the face of burst, the topological relation and the user variation relation cannot be identified from the physical angle under the condition that the installation configuration is wrong manually, the topological stability and accuracy under the micropower wireless can be perfectly realized, the installation and the setting are accurate in the early period and the periodic maintenance in the later period are required, the labor cost is greatly increased, and the efficiency is not high.
The power line carrier can solve the capacity of the platform area topology identification and the household variation relation from a physical surface, but the hierarchical relation of equipment in a power grid cannot be identified due to the characteristics of voltage signals, so that although the topological relation is identified, the upper and lower levels cannot be accurately positioned, and the primary topology identification is realized.
Reactive current identification, aiming at the defects and shortcomings of the 2 schemes at present, the reactive current identification technology can effectively solve the capabilities of physical identification and superior and subordinate relation identification, but has a fatal problem, and is a characteristic signal, so that the technology cannot have the communication capability like the technology in the 2, and therefore, the function is single, and some higher-level applications cannot be realized.
The reactive pulse current encoding technology is to output binary codes in a pulse mode under the condition of applying the reactive current characteristic, so that the reactive current has a basic communication function.
For example, a "method and apparatus for encoding concatenated channels applied to narrowband power line communication" disclosed in chinese patent document has the following publication number: CN104518844B, filing date thereof: 27/09/2013, which includes determining the minimum number of symbols contained in a single coding block which meets a first mapping relation according to an expected code rate of reed-solomon (RS) coding of a signal sequence and a preset number of symbols contained in check bits in the single coding block obtained after the RS coding; the first mapping relation is the mapping relation among the expected code rate, the preset number and the number of symbols contained in the single coding block; determining the length of the single symbol mapped by the minimum number of the symbols contained in the single coding block according to a second mapping relation between the number of the symbols contained in the single coding block and the length of the single symbol in the single coding block; wherein the second mapping relation satisfies: the length of the single symbol is increased along with the increase of the number of the symbols contained in the single coding block; according to the expected code rate, the minimum number of symbols contained in the single coding block and the determined length of the symbols, RS coding is carried out on the signal sequence to obtain each coding block; interweaving the code blocks to obtain the interwoven code blocks; and carrying out convolutional coding on the symbols of each interleaved coding block according to a sequence to obtain a data sequence after convolutional coding. The channel coding method of the application adopts power line carriers, the hierarchical relation of the equipment in the power grid cannot be identified, and the topology identification is low.
Disclosure of Invention
The invention mainly solves the problems of high cost and low topology identification of the encoding method in the prior art; the coding system and method using the reactive current pulse are provided, so that the reactive current has a basic communication function and is higher in topological level.
The technical problem of the invention is mainly solved by the following technical scheme: an encoding system applying reactive current pulses comprises a signal generating device, a reactive current generating device, a collecting device and an encoding device; the signal generating device is connected with the reactive current generating device and is used for outputting PWM signals; the reactive current generating device is connected with the collecting device, generates reactive current and generates reactive current pulse under the control of the PWM signal; the collecting device is connected with the encoding device and collects the reactive current pulse; the coding device performs binary coding by means of reactive current pulses. The signal generating device is used for controlling the reactive current generating device to generate reactive current pulses, binary coding is carried out according to the generated pulse signals, so that the reactive current has a basic communication function, and equipment identification application, ad hoc network application and the like can be carried out according to the coding.
Preferably, the signal generating device is an MCU. The output PWM waveform can be adjusted by programming the MCU.
Preferably, the reactive current generating device comprises a trigger module, a switch module, a power supply module and a reactive current generating source, the reactive current generating source is connected with the trigger module through the switch module, the trigger module controls the switch module to be switched on and switched off, the power supply module supplies power to the trigger module, and the trigger module is connected with the acquisition device.
Preferably, the trigger module is an MOC3083 chip. By selecting the MOC3083 chip as the trigger device of the switch module, the switch module can be started at any angle and turned on or off.
Preferably, the switch module is a bidirectional thyristor. The bidirectional thyristor is used as a switching device, can be controlled by the trigger device at any angle, and is more convenient to control.
Preferably, the reactive current generating source is a super capacitor.
An encoding method using reactive current pulses, comprising the steps of:
step S1: setting parameters of the PWM signal and the on-off frequency of the switch module;
step S2: the acquisition device acquires the reactive current pulse signal and outputs a oscillogram thereof;
step S3: taking the absolute value of the 1/4 period value according to the waveform diagram;
step S4: binary encoding is performed according to the value of step S3.
According to the characteristics of the silicon controlled rectifier, the maximum on-off frequency is 5ms, in order to guarantee the use universality, the on-off frequency is set within 5-10ms, the pulse width of the PWM of the MCU is programmed to be 7ms, the period is 28ms, the duty ratio is 0.25 of square waves, the silicon controlled rectifier drives the SCR pin to output the pulse, the value at the 7ms position of the central point is obtained through the collection of the reactive current pulse, the absolute value is uniformly obtained, and binary coding is carried out according to the magnitude of the absolute value.
Preferably, in step S4, a value greater than 0.5 is binary "1" coded and a value less than 0.5 is binary "0" coded with 0.5 as a boundary.
The invention has the beneficial effects that: the signal generating device is used for controlling the reactive current generating device to generate reactive current pulses, binary coding is carried out according to the generated pulse signals, so that the reactive current has a basic communication function.
Drawings
Fig. 1 is a block diagram of the coding system according to the first embodiment.
Fig. 2 is a schematic circuit diagram of a reactive current generating apparatus according to the first embodiment.
Fig. 3 is a waveform diagram acquired by the acquisition device according to the first embodiment.
In the figure, 1 is a signal generating device, 2 is a reactive current generating device, 3 is a collecting device, and 4 is an encoding device.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows: an encoding system using reactive current pulses is shown in fig. 1 and comprises a signal generating device 1, a reactive current generating device 2, a collecting device 3 and an encoding device 4; the signal generating device 1 is connected with the reactive current generating device 2, and the signal generating device 1 is used for outputting PWM signals; the reactive current generating device 2 is connected with the collecting device 3, the reactive current generating device 2 generates reactive current and generates reactive current pulse under the control of the PWM signal; the acquisition device 3 is connected with the coding device 4, and the acquisition device 3 acquires reactive current pulses; the coding means 4 perform a binary coding by means of the reactive current pulses.
As shown in fig. 2, the reactive current generating device 2 includes a trigger module, a switch module, a power supply module and a reactive current generating source, the reactive current generating source is connected with the trigger module through the switch module, the trigger module controls the switch module to be switched on and off, the power supply module supplies power to the trigger module, and the trigger module is connected with the collecting device 3; the signal generating device 1 is an MCU, the trigger module is an MOC3083 chip, the switch module is a bidirectional thyristor, and the reactive current generating source is a super capacitor.
An encoding method using reactive current pulses, comprising the steps of:
step S1: setting parameters of the PWM signal and the on-off frequency of the switch module;
step S2: as shown in fig. 3, the acquisition device 3 acquires a reactive current pulse signal and outputs a waveform diagram thereof;
step S3: taking the absolute value of the 1/4 period value according to the waveform diagram;
step S4: binary encoding according to the value of step S3; with 0.5 as a boundary, a value greater than 0.5 is binary "1" coded, and a value less than 0.5 is binary "0" coded.
According to the characteristics of the silicon controlled rectifier, the maximum on-off frequency is 5ms, in order to guarantee the use universality, the on-off frequency is set within 5-10ms, the pulse width of the PWM of the MCU is programmed to be 7ms, the period is 28ms, the duty ratio is 0.25 of square waves, the silicon controlled rectifier drives the SCR pin to output the pulse, the value at the 7ms position of the central point is obtained through the collection of the reactive current pulse, the absolute value is uniformly obtained, and binary coding is carried out according to the magnitude of the absolute value.
In the specific application, the PWM of the MCU is programmed to enable the pulse width of the output PWM signal to be 7ms, the period to be 28ms and the square wave with the duty ratio to be 0.25, the SCR pin is driven by the silicon controlled rectifier to output the section of pulse to the MOC3083 chip, the MOC3083 chip triggers the on and off of the bidirectional silicon controlled rectifier, the reactive current generated by the capacitor is output and is output to the EXCEL table to output a waveform diagram after AD sampling, the output waveform of the reactive current pulse is consistent with the duty ratio and the period of the PWM signal waveform, and the reactive current pulse has a positive part and a negative part, so that after the pulse signal takes the value at the central point of 7ms through the coding device 4, the absolute value is required to be taken, binary coding is carried out according to the magnitude of the absolute value, the reactive current pulse signal belongs to a slow pulse because of the influence of the triggering of the silicon controlled rectifier, and the capacity of transmitting a large amount of data information is not provided, the method can exist as a certain characteristic signal in many times, a bit binary system is transmitted according to 5ms to calculate, 40ms is needed for completing one byte transmission, 8 bits of coding is carried out on a reactive current signal, 256 different combinations can be formed, high-level topology identification applications such as equipment identification, networking topology identification and equipment fault alarm can be carried out according to the 256 combinations, and the defects of micropower wireless and power line carriers in the aspect of topology identification are effectively overcome.
Compared with a micropower wireless station area topology implementation scheme, the invention solves the problem of inaccurate topology caused by cross-station area identification, manual file entry error and the like from a physical angle, can realize the identification of the superior-subordinate relation of power equipment compared with power carrier PLC identification, thereby realizing more accurate and higher-practicability topology relation, adopts a scheme of identifying potential application reactive current on the market at present, has smaller current and is designed for a pulse coding type invention, the reactive current is no longer a signal in a pure sense, has the capability of information transmission, and extends various intelligent applications on the basis: such as device networking, device failure alarm, device plug and play, etc.
The second embodiment is an encoding system applying reactive current pulses, and the second embodiment is different from the first embodiment in that an acquisition device 3 of the first embodiment comprises a shell, a current transformer, a spring, a first pressure sensor, a second pressure sensor, a sliding block and a comparator, wherein the current transformer is connected with a reactive current generation device 2, the spring is connected with the current transformer, one end of the spring is fixedly connected with the inner wall of the shell, the other end of the spring is connected with the sliding block, the sliding block is slidably installed in the shell, one end facing the spring is the front end of the sliding block, the front end of the sliding block is abutted against the first pressure sensor, the rear end of the sliding block is abutted against the second pressure sensor, the output end of the first pressure sensor is connected with the first input end of the comparator, and the output end of the second pressure sensor is connected with the second input end of; the reactive current generated by the reactive current generating device 2 is transmitted through the current transformer, the spring contracts when the current flows, when the spring is installed, the spring is pre-compressed, the pre-compression degree is set according to a binary coding value dividing line, so that the second pressure sensor has a certain output value, when the current is larger, the contraction degree of the spring is larger, the second pressure sensor is not stressed, the first pressure sensor is stressed and outputs a certain pressure value, the output pressure value is larger than the output pressure value of the second pressure sensor, the comparator outputs '1', when the current is smaller, the contraction degree of the spring is small and does not exceed the pre-compression degree, the output value of the second pressure sensor is still larger than the output value of the first pressure sensor, the comparator outputs '0', an oscilloscope is connected behind the comparator, and binary coding can be performed according to the waveform of the oscilloscope, the coding device 4 is not needed to be arranged separately, so that the cost is saved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. An encoding system using reactive current pulses, comprising
The device comprises a signal generating device, a reactive current generating device, a collecting device and a coding device;
the signal generating device is connected with the reactive current generating device and is used for outputting PWM signals;
the reactive current generating device is connected with the collecting device, generates reactive current and generates reactive current pulse under the control of the PWM signal;
the collecting device is connected with the encoding device and collects the reactive current pulse;
the coding device performs binary coding by means of reactive current pulses.
2. The encoding system using reactive current pulses as claimed in claim 1,
the signal generating device is an MCU.
3. The coding system using reactive current pulses according to claim 1 or 2,
the reactive current generating device comprises a trigger module, a switch module, a power supply module and a reactive current generating source, wherein the reactive current generating source is connected with the trigger module through the switch module, the trigger module controls the switch module to be switched on and switched off, the power supply module supplies power for the trigger module, and the trigger module is connected with the acquisition device.
4. The coding system using reactive current pulses as claimed in claim 3,
the trigger module is an MOC3083 chip.
5. The coding system using reactive current pulses as claimed in claim 3,
the switch module is a bidirectional thyristor.
6. The coding system using reactive current pulses as claimed in claim 3,
the reactive current generating source is a super capacitor.
7. An encoding method using reactive current pulses, which is applied to the encoding system using reactive current pulses as claimed in any one of claims 1 to 6, and which comprises the steps of:
step S1: setting parameters of the PWM signal and the on-off frequency of the switch module;
step S2: the acquisition device acquires the reactive current pulse signal and outputs a oscillogram thereof;
step S3: taking the absolute value of the 1/4 period value according to the waveform diagram;
step S4: binary encoding is performed according to the absolute value magnitude of step S3.
8. The encoding method using reactive current pulses as claimed in claim 7,
in step S4, a value greater than 0.5 is binary "1" coded and a value less than 0.5 is binary "0" coded with 0.5 as a boundary.
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