CN112003802B - Coding system and method using reactive current pulse - Google Patents
Coding system and method using reactive current pulse Download PDFInfo
- Publication number
- CN112003802B CN112003802B CN202010565932.6A CN202010565932A CN112003802B CN 112003802 B CN112003802 B CN 112003802B CN 202010565932 A CN202010565932 A CN 202010565932A CN 112003802 B CN112003802 B CN 112003802B
- Authority
- CN
- China
- Prior art keywords
- reactive current
- coding
- generating device
- current pulses
- pressure sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
Abstract
The invention discloses a coding system and a coding method using reactive current pulses, comprising 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 acquisition device is connected with the coding device; the encoding device carries out binary encoding through reactive current pulse, and the method comprises the following steps: step S1: setting parameters of PWM signals and the switching-on and switching-off frequency of a switch module; step S2: the acquisition device acquires the reactive current pulse signal and outputs a waveform chart of the reactive current pulse signal; step S3: taking an absolute value of the 1/4 period value according to the waveform diagram; step S4: performing binary coding according to the value of the step S3; the invention not only enables reactive current to have basic communication function, but also can develop related advanced application, and effectively overcomes the defects of micro-power wireless and power line carrier in topology identification.
Description
Technical Field
The invention relates to the technical field of coding, in particular to a coding system and a coding method using reactive current pulses.
Background
The existing micropower wireless can realize the function of topology identification in an environment with disciplinary, but in the face of sudden, manual fault installation configuration, the topology relationship and the family change relationship cannot be identified from a physical angle, so that the topology stability under the micropower wireless is perfectly and accurately realized, the accurate installation and the setting in the early stage and the periodic maintenance in the later stage are required, the labor cost is greatly increased, and the efficiency is not high.
The power line carrier can solve the capability of topological identification and household change relation of a platform from a physical surface, but the voltage signal characteristics of the power line carrier cannot identify the hierarchical relation of equipment in a power grid, so that although the topological relation is identified, the upper and lower stages cannot be accurately positioned, and the power line carrier is primary topological identification.
Reactive current identification, aiming at the defects and shortcomings of the 2 schemes, can effectively solve the capability of physical identification and upper and lower relation identification, but has a fatal problem, is a characteristic signal, cannot have communication capability like the 2 schemes, has single function, and cannot realize higher-level application.
The reactive pulse current coding technology realizes binary coding through pulse mode output under the condition of applying reactive current characteristics, so that reactive current has basic communication function, the technology is applied to realize the basic function of topology identification, and related advanced application development such as alarm, equipment self-identification and networking can be performed.
For example, a "cascade channel coding method and apparatus applied to narrowband power line communication" disclosed in chinese patent literature, its bulletin number: CN104518844B, filing date: the method comprises the following steps of determining the minimum number of symbols contained in a single coding block meeting a first mapping relation according to an expected code rate of Reed-Solomon RS coding on a signal sequence and the preset number of symbols contained in check bits in the single coding block obtained after RS coding in 2013, 09 and 27 days; the first mapping relation is a 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 increases with the number of symbols contained in the single coding block; RS encoding is carried out on the signal sequence according to the expected code rate, the minimum number of symbols contained in the single encoding block and the determined length of the symbols, so that each encoding block is obtained; interleaving the code blocks to obtain interleaved code blocks; and carrying out convolutional coding on the symbols of each interleaved coding block according to the sequence to obtain a data sequence after convolutional coding. The channel coding method of the application adopts a power line carrier, cannot identify the hierarchical relationship of equipment in a power grid, and has low topology identification.
Disclosure of Invention
The invention mainly solves the problems of high cost and low topology identification of the coding method in the prior art; the reactive current pulse coding system and method are provided, so that reactive current has a basic communication function, and the topology level is higher.
The technical problems of the invention are mainly solved by the following technical proposal: a coding system applying reactive current pulses 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 acquisition device, and generates reactive current and reactive current pulses under the control of PWM signals; the acquisition device is connected with the encoding device and acquires reactive current pulses; the coding device performs binary coding through reactive current pulse. 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, equipment identification application, ad hoc network application and the like can be carried out according to the codes, the basic function of topology identification is realized, related advanced application development can be carried out, and the defects of micro-power wireless and power line carrier in the aspect of topology identification are effectively overcome.
Preferably, the signal generating device is an MCU. The output PWM waveform can be regulated 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, 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 opened and closed, the power supply module supplies power for the trigger module, and the trigger module is connected with the acquisition device.
Preferably, the triggering module is a MOC3081 chip. By selecting the MOC3081 chip as a triggering device of the switch module, the switch module can be triggered at any angle to be opened or closed.
Preferably, the switch module is a bidirectional thyristor. The bidirectional silicon controlled rectifier is adopted as a switch device, and can be controlled by a trigger device at any angle, so that the control is more convenient.
Preferably, the reactive current generating source is a super capacitor.
A method of encoding using reactive current pulses, comprising the steps of:
step S1: setting parameters of PWM signals and the switching-on and switching-off frequency of a switch module;
step S2: the acquisition device acquires the reactive current pulse signal and outputs a waveform chart of the reactive current pulse signal;
step S3: taking an 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 characteristic of the silicon controlled rectifier, the switching-off frequency is set to be 5ms at most once, in order to ensure the universality of use, the switching-off frequency is set to be 5-10ms, the PWM of the MCU is programmed with a square wave with the pulse width of 7ms, the period of 28ms and the duty ratio of 0.25, the silicon controlled rectifier is driven to output the pulse at the SCR foot, the value at the 7ms position of the central point is taken through the collection of reactive current pulse, the absolute value is taken uniformly, and binary coding is carried out according to the absolute value.
Preferably, in the step S4, a binary value of greater than 0.5 is encoded as "1" and a binary value of less than 0.5 is encoded as "0" using 0.5 as a boundary.
The beneficial effects of the invention are as follows: 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, the basic function of topology identification is realized by using the technology, the development of related advanced application can be carried out, and the defects of micro-power wireless and power line carrier in the aspect of topology identification are effectively overcome.
Drawings
Fig. 1 is a block diagram of the structure of an encoding system of the first embodiment.
Fig. 2 is a schematic circuit diagram of a reactive current generating device according to the first embodiment.
Fig. 3 is a waveform diagram of acquisition by the acquisition device of the first embodiment.
In the figure, a signal generating device, a reactive current generating device, a collecting device and a coding device are shown in the figure, wherein the signal generating device, the reactive current generating device, the collecting device and the coding device are shown in the figure.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Embodiment one: an encoding system using reactive current pulses, as shown in fig. 1, 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 acquisition device 3, the reactive current generating device 2 generates reactive current, and reactive current pulses are generated under the control of PWM signals; the acquisition device 3 is connected with the encoding device 4, and the acquisition device 3 acquires reactive current pulses; the encoding device 4 performs binary encoding by reactive current pulses.
As shown in fig. 2, the reactive current generating device 2 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 opened and closed, the power supply module supplies power for the trigger module, and the trigger module is connected with the acquisition device 3; the signal generating device 1 is an MCU, the trigger module is an MOC3081 chip, the switch module is a bidirectional thyristor, and the reactive current generating source is a super capacitor.
A method of encoding using reactive current pulses, comprising the steps of:
step S1: setting parameters of PWM signals and the switching-on and switching-off frequency of a switch module;
step S2: as shown in fig. 3, the acquisition device 3 acquires a reactive current pulse signal and outputs a waveform chart thereof;
step S3: taking an absolute value of the 1/4 period value according to the waveform diagram;
step S4: performing binary coding according to the value of the step S3; with 0.5 as a boundary, a value greater than 0.5 is binary-coded as "1", and a value less than 0.5 is binary-coded as "0".
According to the characteristic of the silicon controlled rectifier, the switching-off frequency is set to be 5ms at most once, in order to ensure the universality of use, the switching-off frequency is set to be 5-10ms, the PWM of the MCU is programmed with a square wave with the pulse width of 7ms, the period of 28ms and the duty ratio of 0.25, the silicon controlled rectifier is driven to output the pulse at the SCR foot, the value at the 7ms position of the central point is taken through the collection of reactive current pulse, the absolute value is taken uniformly, and binary coding is carried out according to the absolute value.
In a specific application, the PWM of MCU is programmed to make the pulse width of the output PWM signal 7ms, the period is 28ms, the duty ratio is 0.25 square wave, the SCR foot is driven by the SCR to output this section of pulse to the MOC3081 chip, the MOC3081 chip triggers the on and off of the bidirectional SCR, the reactive current generated by the capacitor is output, the output waveform of the reactive current pulse is output to the EXCEL form output waveform chart after AD sampling, the duty ratio and period of the waveform of the PWM signal are consistent, because the reactive current pulse has positive and negative components, the encoding device 4 takes the value of 7ms at the central point of the pulse signal, the value also takes absolute value, binary encoding is carried out according to the magnitude of the absolute value, the reactive pulse current signal belongs to a slow pulse, the capability of transmitting a large amount of data information is not possessed, a bit (bit) is transmitted according to 5ms to binary calculation, a transmission byte 40ms is completed, the combination of the reactive current and the 256-bit carrier wave can be identified, the topology can be used in the aspect of the network, the topology is different from the aspect of the topology, the topology is identified, and the fault can be identified, and the topology is well, and the fault can be identified.
Compared with a micro-power wireless platform area topology implementation scheme, the method solves the problem of inaccurate topology caused by inter-platform area identification, manual file entry errors and the like possibly occurring from a physical perspective, and compared with power carrier PLC identification, the method can realize the identification of the upper and lower relationships of power equipment, so that the more accurate and practical topology relationship is realized, and the scheme for identifying the potential application reactive current in the market at present adopts the scheme that the current is smaller, is designed for the pulse coding type, is not a signal in a simple sense any more, has the capability of information transmission, and extends various intelligent applications on the basis of the identification: such as device networking, device failure alerting, device plug and play, etc.
In the second embodiment, compared with the first embodiment, the difference is that the collecting device 3 in the first embodiment includes a housing, a current transformer, a spring, a first pressure sensor, a second pressure sensor, a slider and a comparator, the current transformer is connected with the reactive current generating device 2, the spring is connected with the current transformer, one end of the spring is fixedly connected with the inner wall of the housing, the other end of the spring is connected with the slider, the slider is slidably mounted in the housing, one end facing the spring is the front end of the slider, the front end of the slider is abutted with the first pressure sensor, the rear end of the slider is abutted with 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 comparator; the reactive current generated by the reactive current generating device 2 is transmitted through the current transformer, the spring is contracted when the current flows, the spring is precompressed when the spring is installed, the precompressed degree is set according to a binary code value dividing line, 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 pressure value output by the second pressure sensor, the comparator outputs '1', when the current is smaller, the contraction degree of the spring is smaller and does not exceed the precompressed degree, the value output by the second pressure sensor is still larger than the value output by the first pressure sensor, the comparator outputs '0', an oscilloscope is connected behind the comparator, binary codes can be carried out according to the waveform of the oscilloscope, the encoding device 4 is not required to be independently arranged, and the cost is saved.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (8)
1. A coding system employing 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 acquisition device, and generates reactive current and reactive current pulses under the control of PWM signals;
the acquisition device is connected with the encoding device and acquires reactive current pulses;
the coding device performs binary coding through reactive current pulse;
the collection device 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 the reactive current generation device, 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 mounted 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 comparator.
2. A coding system employing reactive current pulses according to claim 1,
the signal generating device is an MCU.
3. A coding system using reactive current pulses according to claim 1 or 2, characterized in that,
the reactive current generating device comprises a triggering module, a switch module, a power supply module and a reactive current generating source, wherein the reactive current generating source is connected with the triggering module through the switch module, the triggering module controls the switch module to be opened and closed, the power supply module supplies power for the triggering module, and the triggering module is connected with the acquisition device.
4. A coding system employing reactive current pulses according to claim 3,
the trigger module is a MOC3081 chip.
5. A coding system employing reactive current pulses according to claim 3,
the switch module is a bidirectional silicon controlled rectifier.
6. A coding system employing reactive current pulses according to claim 3,
the reactive current generating source is a super capacitor.
7. A method of encoding using reactive current pulses, suitable for use in a system as claimed in any one of claims 3 to 6, comprising the steps of:
step S1: setting parameters of PWM signals and the switching-on and switching-off frequency of a switch module;
step S2: the acquisition device acquires reactive current pulses and outputs a waveform chart of the reactive current pulses;
step S3: taking an absolute value of the 1/4 period value according to the waveform diagram;
step S4: binary encoding is performed according to the absolute value of the step S3.
8. A method of encoding using reactive current pulses according to claim 7, wherein,
in the step S4, a value greater than 0.5 is binary-coded with 0.5 as a boundary, and a value less than 0.5 is binary-coded with "0".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010565932.6A CN112003802B (en) | 2020-06-19 | 2020-06-19 | Coding system and method using reactive current pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010565932.6A CN112003802B (en) | 2020-06-19 | 2020-06-19 | Coding system and method using reactive current pulse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112003802A CN112003802A (en) | 2020-11-27 |
| CN112003802B true CN112003802B (en) | 2023-09-19 |
Family
ID=73467860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010565932.6A Active CN112003802B (en) | 2020-06-19 | 2020-06-19 | Coding system and method using reactive current pulse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112003802B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691349A (en) * | 2021-08-02 | 2021-11-23 | 北京中科格励微科技有限公司 | Data coding and decoding method and device of Sigma-Delta modulator |
| CN114552584A (en) * | 2022-01-14 | 2022-05-27 | 珠海多创科技有限公司 | Low-voltage power grid distribution area topology identification system and identification method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859890Y (en) * | 2005-12-06 | 2007-01-17 | 梁久忠 | Intellectual power electricity-saving appliance |
| CN102946259A (en) * | 2012-10-18 | 2013-02-27 | 宋莉莉 | Carrier wave communication system based on electric power line and carrier wave communication method |
| CN103311932A (en) * | 2013-05-29 | 2013-09-18 | 国电南京自动化股份有限公司 | Double-DSP (digital signal processor) control system based on chained SVG (scalable vector graphics) |
| CN103560521A (en) * | 2013-11-13 | 2014-02-05 | 国网上海市电力公司 | Controller for dynamic voltage reactive compensator |
| CN103840475A (en) * | 2014-03-12 | 2014-06-04 | 兴盛电器股份有限公司 | Stepless compensating device and method |
| CN104769851A (en) * | 2012-09-17 | 2015-07-08 | 意法爱立信有限公司 | A method of and receiver for communication during wireless power transmission |
| CN106899025A (en) * | 2017-04-26 | 2017-06-27 | 武汉国想电力科技股份有限公司 | A kind of comprehensive compensation type alternating current steady voltage plug |
| CN108683368A (en) * | 2018-04-24 | 2018-10-19 | 电子科技大学 | A kind of brshless DC motor device |
| CN109103899A (en) * | 2018-09-13 | 2018-12-28 | 江苏科技大学 | A kind of grid-connected wind generator system reactive power compensator in sea and its control method |
| CN110784965A (en) * | 2018-07-30 | 2020-02-11 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
| CN110932396A (en) * | 2019-11-26 | 2020-03-27 | 山东电亮亮信息科技有限公司 | Low-voltage distribution network topology identification system based on pulse characteristic current signals |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6126499B2 (en) * | 2013-08-30 | 2017-05-10 | 株式会社東芝 | Power conversion apparatus, cooperative control method, and program |
-
2020
- 2020-06-19 CN CN202010565932.6A patent/CN112003802B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859890Y (en) * | 2005-12-06 | 2007-01-17 | 梁久忠 | Intellectual power electricity-saving appliance |
| CN104769851A (en) * | 2012-09-17 | 2015-07-08 | 意法爱立信有限公司 | A method of and receiver for communication during wireless power transmission |
| CN102946259A (en) * | 2012-10-18 | 2013-02-27 | 宋莉莉 | Carrier wave communication system based on electric power line and carrier wave communication method |
| CN103311932A (en) * | 2013-05-29 | 2013-09-18 | 国电南京自动化股份有限公司 | Double-DSP (digital signal processor) control system based on chained SVG (scalable vector graphics) |
| CN103560521A (en) * | 2013-11-13 | 2014-02-05 | 国网上海市电力公司 | Controller for dynamic voltage reactive compensator |
| CN103840475A (en) * | 2014-03-12 | 2014-06-04 | 兴盛电器股份有限公司 | Stepless compensating device and method |
| CN106899025A (en) * | 2017-04-26 | 2017-06-27 | 武汉国想电力科技股份有限公司 | A kind of comprehensive compensation type alternating current steady voltage plug |
| CN108683368A (en) * | 2018-04-24 | 2018-10-19 | 电子科技大学 | A kind of brshless DC motor device |
| CN110784965A (en) * | 2018-07-30 | 2020-02-11 | 上海雷舞照明技术有限公司 | Driving device and driving chip |
| CN109103899A (en) * | 2018-09-13 | 2018-12-28 | 江苏科技大学 | A kind of grid-connected wind generator system reactive power compensator in sea and its control method |
| CN110932396A (en) * | 2019-11-26 | 2020-03-27 | 山东电亮亮信息科技有限公司 | Low-voltage distribution network topology identification system based on pulse characteristic current signals |
Non-Patent Citations (3)
| Title |
|---|
| 差异化级联型电流质量调节装置的补偿策略;徐永海等;《电网技术》;20110131(第01期);全文 * |
| 配电网电能质量调节装置集散配置策略;冯兴田等;《电力系统保护与控制》;第37页 * |
| 静止无功补偿装置的整体设计;张维俊;《中国高新技术企业》;20091015(第20期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112003802A (en) | 2020-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112003802B (en) | Coding system and method using reactive current pulse | |
| CN105262490B (en) | Based on Manchester Code/decode Adaptable System and its method | |
| CN102740568A (en) | Non-isolated LED (light-emitting diode) power supply with power factor correction function | |
| CN1106101C (en) | FSK demodulator using a super linear integrator | |
| CN104144001B (en) | A kind of method improving power line carrier signal transmission reliability | |
| CN104218975B (en) | Power line carrier communication method and information transmitting device | |
| CN206300696U (en) | A kind of photo-electronic directly reading gas meter controller based on LoRa spread spectrum technics | |
| CN112003635B (en) | Networking and topology identification system and method under pure reactive current pulse signal | |
| CN201535876U (en) | Solar slit tracking device | |
| CN203025931U (en) | Singlechip-based wireless encoding and decoding remote controller | |
| CN108023680A (en) | Low speed variable bit rate multi-mode encoding modulator based on VTDM frame structures | |
| CN103259628B (en) | Based on method for estimating error rate and the device of Model Matching | |
| CN104811082A (en) | Nanosecond rising edge type pulse power source | |
| CN205377652U (en) | Intelligent control digital power supply | |
| CN108646617A (en) | A kind of absolute encoder angle reading circuit and method based on FPGA | |
| CN111654111B (en) | GOOSE simulation test method for secondary system of intelligent substation | |
| CN103166676B (en) | Method capable of achieving multichannel transmission of power frequency communication uplink signals simultaneously | |
| Mandourarakis et al. | Transmission of Digital Data to Cascaded H-bridge Converters Through the Power Line | |
| CN107256199B (en) | Single bus circuit with low power consumption | |
| CN105553625A (en) | Remote channel message compression method and system for electricity consumption collection system | |
| CN205959914U (en) | Can read circuit breaker of combined floodgate number of times | |
| CN106527644B (en) | Power supply and control method thereof | |
| CN206542445U (en) | A kind of Internet of Things gas meter controller based on LoRa spread spectrum technics | |
| CN208999500U (en) | Lightning stroke motion detector circuit | |
| CN214704943U (en) | Telecontrol communication unit of electric power system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |