CN206742966U - A kind of novel intelligent power supply unit - Google Patents
A kind of novel intelligent power supply unit Download PDFInfo
- Publication number
- CN206742966U CN206742966U CN201720469526.3U CN201720469526U CN206742966U CN 206742966 U CN206742966 U CN 206742966U CN 201720469526 U CN201720469526 U CN 201720469526U CN 206742966 U CN206742966 U CN 206742966U
- Authority
- CN
- China
- Prior art keywords
- power supply
- intelligent power
- supply unit
- novel intelligent
- input
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a kind of novel intelligent power supply unit, including multiple harvesters, all harvesters are communicated with data concentrator, and each harvester is connected with a clock synchronization unit；The clock synchronization unit includes FPGA controller, the input of the FPGA controller is connected with constant-temperature crystal oscillator, output end is connected with optical transmitting set, and the input of at least one clock synchronization unit is connected with time service module, is communicated between all clock synchronization units by wireless communication module.The utility model contains the network controller of integrated ICP/IP protocol, can facilitate and is attached with server, and connected mode can arbitrarily select in the mode such as netting twine, WIFI, 3G.Each harvester can complete synchronous acquisition by optical fiber in standing, and can fully ensure that the time synchronized between each collection point, it is ensured that accomplish that exact time samples, target is accurate during guarantee.
Description
Technical field
It the utility model is related to intelligent power distribution network technology field, more particularly to a kind of novel intelligent power supply unit.
Background technology
The assurance of Operation of Electric Systems, analysis personnel to power network characteristic is dependent on the real-time monitoring based on electric network model point
Analysis.Accurate electrical network parameter is to form the basis that accurate electric network model carries out power system computation.Therefore, electrical network parameter is improved
Accuracy and reliability, the safe and stable operation of short-term load is significant.
Current power distribution network lacks accurate information in real time, and gathered data is mostly each autonomous device collection, lacks accurate markers
Information, when carrying out the work such as tidal current analysis, state estimation, Loop Closing Operation, the data message of same time cross-section can not be obtained,
Therefore the precision of result of calculation will necessarily be a greater impact.
Sum it up, a technical problem for needing those skilled in the art urgently to solve at present is：How in power distribution system
A kind of work is found under system normal operation comprehensive, efficient device realizes the real-time online measuring of synchrodata.
Utility model content
The purpose of this utility model is exactly to solve the above problems, there is provided a kind of novel intelligent power supply unit, to
Synchronized data carry out real-time on-line measurement, and reasonable in design, practical, cost is low, and operating efficiency is high.
To achieve these goals, the utility model adopts the following technical scheme that：
A kind of novel intelligent power supply unit, including multiple harvesters, all harvester and data concentrator
Communication, each harvester are connected with a clock synchronization unit；
The clock synchronization unit includes FPGA controller, and the input of the FPGA controller is connected with constant-temperature crystal oscillator,
Output end is connected with optical transmitting set, and the input of at least one clock synchronization unit is connected with time service module, and all clocks are same
Communicated between step unit by wireless communication module.
The time service module uses UM220 modules.
Synchronized between the harvester and clock synchronization unit using optical fiber.
The harvester is attached with data concentrator by Ethernet.
The harvester includes data processing unit, and the data processing unit is sent out with memory cell, optical receiver, light
Emitter, analog-digital converter and network controller connection, are also connected by photoelectric isolating circuit with digital quantity imput output circuit.
The network controller uses W5100 type network interface chips, and W5100 types network interface chip connects with RJ45 interfaces
Connect.
The analog-digital converter is also connected with range switch circuit, and the range switch circuit includes four amplifying circuits,
The input exported by connecting the analog-digital converter after one switch of connection of each amplifying circuit, the first Current Mutual Inductance
Device is directly connected to the input of two of which amplifying circuit, while the input of another two amplifying circuit is connected by switching, the
Two current transformers connect the input of four amplifying circuits by switching respectively.
The memory cell uses SD card, and data are stored in SD card by data processing unit by spi bus.
The wireless communication module is ZigBee communication module.
The data processing unit uses TMS320F28335DSP.
The beneficial effects of the utility model are：
The utility model contains the network controller of integrated ICP/IP protocol, can facilitate and is attached with server, even
The mode of connecing can arbitrarily select in the mode such as netting twine, WIFI, 3G.
Each harvester can complete synchronous acquisition by optical fiber in standing, and can fully ensure that the time between each collection point
It is synchronous, it is ensured that to accomplish that exact time samples, target is accurate during guarantee.
Brief description of the drawings
Fig. 1 is overall structure figure of the present utility model；
Fig. 2 is the structure chart of harvester and clock synchronization unit；
Fig. 3 is the concrete structure diagram of clock synchronization unit；
Fig. 4 is the concrete structure diagram of harvester；
Fig. 5 is range switch circuit；
Fig. 6 is cyclization circuit diagram.
Embodiment：
The utility model is described further with embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of novel intelligent power supply unit, including multiple harvesters, all harvesters with
Data concentrator is communicated, and each harvester is connected with a clock synchronization unit；As Figure 2-3, the clock is same
Step unit includes FPGA controller, and the input of the FPGA controller is connected with constant-temperature crystal oscillator, and output end connects with optical transmitting set
Connect, the input of at least one clock synchronization unit is connected with time service module, by wireless between all clock synchronization units
Communication module is communicated.
, can be by being only that host node is equipped with time service mould when there is two or more (containing two) measuring node in same station
Block, remaining child node obtain the precise time information of time service module by way of ZigBee communication.The present apparatus uses TI's
For CC2530 type ZigBee chips as wireless communication module, it has the compatible wireless transceivers of IEE802.15.4, contains inside it
There are programmable MCU units, the synchronous protocol between node can be implanted into ZigBee module, also provided is MCU with penetrating
The communication interface of frequency part, it can be used for reading reiving/transmitting state, it is accurate to capture data start time, simultaneously provide standard for message
True sequential.Synchronizing process uses IEEE1588 agreements.Synchronizing process uses three step synchronous modes, even the synchronous mode exists
Remain to complete accurate synchronizing process in the case that slave clock drift is larger.
When module use UM220 modules, the time service precision of the module can reach 100ns, and this clock accuracy is fully able to full
Requirement of the foot to phase angle measurement.The pattern of the module output time information is the form of serial data+pulse signal, passes through serial ports
The information such as the time for being accurate to second rank, coordinate are sent to FPGA, the other correct time of nanosecond is accurate to and passes through Plush arteries and veins
Rush signal to be demarcated, ensure the absolute accurate of time.Two kinds of time service modes of the time service module compatible with GPS and the Big Dipper, Yong Huke
With according to application selection GPS patterns, Big Dipper pattern, GPS+ Big Dippeves pattern these three patterns.
The main task of FPGA controller is the clock in maintenance system.On the one hand GPS second pulse signal is finely divided
12.8KHz synchronous acquisition pulse is generated, on the other hand, in GPS because maintaining system when environment or other factors loss clock signal
The accurate clock of system.In order to ensure the precision of clock, stable clock is provided for FPGA using constant-temperature crystal oscillator, in the punctual side of device
Face performance compared with conventional active crystal oscillator can improve 50 times.Controller herein allows for FPGA corresponding speed from FPGA
The advantages of fast is spent, using common CPU, needs current operating data being pressed into storehouse after external trigger generation, then locate
Respective interrupt processing function is managed, because the used time is different, therefore meeting when this process triggers different at the time of
Carry out relatively large deviation to clock zone.
As shown in Figure 2 and Figure 4, harvester by DSP, a/d converter, network controller, digital quantity imput output circuit,
The part such as optical receiver, optical transmitting set, memory forms.
DSP uses the TMS320F28335 type high-performance 32-bit processors of TIX's production, the processor
Hardware floating point processing unit (FPU) is internally integrated, the operational capability to floating data can be greatly improved, can be solved with this
A large amount of floating-point operations in Fast Fourier Transform (FFT) (FFT) when calculating phase angle.In addition there is the processor abundant outside to connect
Mouth can be communicated with multiple external equipments, and wherein SCIA is responsible for interacting time scale information, time deviation information etc. with FPGA；
SCIB is responsible for communicating with external host by MAX232 or RS485；SPI is responsible for being communicated with internal mass SD card storage,
It is responsible for the store function of data；General address and data/address bus are communicated with Ethernet control, and data are entered by Ethernet
Row transmission, the phase angle information calculated, amplitude information are sent to server host.
DSP calculates a three-phase voltage, the phase angle and amplitude of electric current per 20ms, and the data calculated are passed through into Ethernet
It is sent to server end.Device uses W5100 type network interface chips, and the chip internal integrates ICP/IP protocol stack, and it is supported
Agreement have TCP, UDP, IPv4, ICMP, ARP, IGMP, PPPoE etc., can simplify data communication architecture using the chip sets
Meter, remove the migration process of ICP/IP protocol from.Communication mode between chip and processor has SPI and parallel two kinds.Consider
The content of the data volume of transmission etc., ensure that transmission speed DSP uses the communication mode of parallel bus with network chip, herein
Highest network transfer speeds can arrive 100Mpbs under kind pattern, disclosure satisfy that rate request of the device to network service.Network pair
External tapping uses RJ45 interfaces, and netting twine, WIFI, 3G etc. can be selected with transmission means by the interface.The upload frequency of data
Rate user can flexibly set (1,5,10,25,50) secondary/second.
As synchronized phase measurement device, precision and the control at collection moment to analog acquisition have very high want
Ask, therefore analog-digital converter AD7606 is sampled using 16 8 Channel Synchronous in the present apparatus.It is anti-mixed that the chip internal contains second order
Folded wave filter, can effectively filter out High-frequency Interference by the wave filter, make the phase angle information of measurement more accurate.In addition, should
Chip can complete the absolute synchronization sampling of 8 passages, can so ensure the absolute unification at each phase acquisition moment, from design structure
Upper reduction phase angle error.Because the clock of FPGA in device is the most accurate, therefore AD beginning transition trigger signal is carried by FPGA
For saltus step can occur for its Busy signal after the completion of AD conversion, and DSP, which is detected, begins through the parallel bus of 16 after Busy signals
Change data is read out.
In view of the input range of measurement signal, remain to record corresponding waveform when circuit breaks down, for AD
In failure, measurement signal can not be completely inclined, therefore is needing to consider the problem of multichannel switches on circuit.It is as shown in figure 5, described
Analog-digital converter is also connected with range switch circuit, and the range switch circuit includes four amplifying circuits, each amplifying circuit
Output all by connecting the input of the analog-digital converter after connecting a switch, the first current transformer is directly connected to it
In two amplifying circuits input, while pass through switch connection another two amplifying circuit input, the second current transformer
Connect the input of four amplifying circuits respectively by switching.
The multiplication factor of amplifying circuit can be configured by toggle switch, and user can be by adjusting toggle switch reality
Now to measurement CT and protection CT configuration, the automatic switchover of range can also be realized for protection CT, now, is adopted by two-way AD
Collection is with signal all the way, and in Figure 5, K1, K3, K6 closure, K2, K4, K5 disconnect, you can realize and CT1 dynamic range was adjusted
Journey.When input signal is smaller, to ensure the acquisition precision of signal, processor, as signal value, works as input using ADC2 value
When signal is larger, processor, as signal, so both can guarantee that the acquisition precision in signal, and can ensures using ADC1 value
The acquisition range of signal.
The data collected can be stored in Large Copacity SD card by harvester by spi bus, and user can be according to depositing
The time of storage and sample frequency option and installment SD capacity.8 tunnels analogy amount signals gather the byte for needing to take every time
16Byte, convert into 20Byte after adding time scale information.
Data volume=20*256*50*60*60=92160000Byte=878.9Mbyte hourly
Data concentrator is mainly responsible for collecting the gathered data of harvester, and data are further analyzed and
Calculate, complete to be stored locally after calculating, while data can be forwarded into each master according to specified requirement as requested
Stand.Data concentrator is the industrial control host with embedded system, according to processor corresponding to the configuration of the size of amount of calculation.
Application of the present utility model is wider, and the network analysis to whole power network can provide reliable data supporting,
Wherein, good effect can be played during cyclization, as shown in fig. 6, passing through the measurement of the side transformers of AB two before cyclization
The voltage phasor of measurement device both sides, the dash current value of cyclization moment can be calculated by the data.Such a mode only needs
The voltage phasor and cyclization line impedance of bus are closed, and it is unrelated with level structure above and below power network, therefore not by operation of power networks
The influence of mode.
Online line parameter circuit value measurement is the very advantageous application scenario of the utility model.Measuring the line of certain end line
The device can be disposed respectively at circuit both ends, target phase when carrying accurate of both ends measurement is received by server during the parameter of road
The data such as angle, amplitude, frequency, the design parameter of this circuit can be analyzed, calculated by two groups of data.According to calculating
Design parameter can be further to calculate line loss, Line Flow etc..
The utility model can be analyzed measured point harmonic data in real time, calculate each harmonic containing ratio, side in real time
Administration of power networks personnel's real-time searching mains by harmonics source is helped, power network 2-50 subharmonic voltage harmonics electric current can be directed to and carry out harmonic wave
Emission level is analyzed, and helps administration of power networks personnel to judge influence of the harmonic source to power network around.
The utility model can calculate the quality of power supply of measured point, calculate accurate active power, reactive power, electricity
Can etc..Accurate trend value can be provided in circuit cyclization, avoid occurring big rush of current during cyclization.
The utility model is mainly that other subsystems provide accurate basic data, utilizes the voltage and the width of electric current measured
The data such as value, phase angle, frequency can calculate power network line parameter, line loss, Line Flow equivalent, can be also used for measuring
Data carry out accident analysis and Power Network Status Estimation.
It is not new to this practicality although above-mentioned specific embodiment of the present utility model is described with reference to accompanying drawing
The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability
Field technique personnel need not pay the various modifications that creative work can make or deformation still in protection model of the present utility model
Within enclosing.
Claims (10)
1. a kind of novel intelligent power supply unit, it is characterized in that, including multiple harvesters, all harvesters and data
Concentrator is communicated, and each harvester is connected with a clock synchronization unit；
The clock synchronization unit includes FPGA controller, and the input of the FPGA controller is connected with constant-temperature crystal oscillator, output
End is connected with optical transmitting set, and the input of at least one clock synchronization unit is connected with time service module, and all clocks are synchronous single
Communicated between member by wireless communication module.
2. a kind of novel intelligent power supply unit as claimed in claim 1, it is characterized in that, the time service module uses UM220 moulds
Block.
3. a kind of novel intelligent power supply unit as claimed in claim 1, it is characterized in that, the harvester is synchronous with clock single
Synchronized between member using optical fiber.
4. a kind of novel intelligent power supply unit as claimed in claim 1, it is characterized in that, the harvester and data concentrator
It is attached by Ethernet.
5. a kind of novel intelligent power supply unit as claimed in claim 1, it is characterized in that, the harvester includes data processing
Unit, the data processing unit are connected with memory cell, optical receiver, optical transmitting set, analog-digital converter and network controller,
Also it is connected by photoelectric isolating circuit with digital quantity imput output circuit.
6. a kind of novel intelligent power supply unit as claimed in claim 5, it is characterized in that, the network controller uses W5100
Type network interface chip, W5100 types network interface chip are connected with RJ45 interfaces.
7. a kind of novel intelligent power supply unit as claimed in claim 5, it is characterized in that, the analog-digital converter is also cut with range
Circuit connection is changed, the range switch circuit includes four amplifying circuits, and the output of each amplifying circuit is by connecting one
The input of the analog-digital converter is connected after switch, the first current transformer is directly connected to the input of two of which amplifying circuit
End, while by switching the input of connection another two amplifying circuit, the second current transformer passes through to switch connects four respectively
The input of amplifying circuit.
8. a kind of novel intelligent power supply unit as claimed in claim 5, it is characterized in that, the memory cell uses SD card, number
Data are stored in SD card by spi bus according to processing unit.
9. a kind of novel intelligent power supply unit as claimed in claim 1, it is characterized in that, the wireless communication module is ZigBee
Communication module.
10. a kind of novel intelligent power supply unit as claimed in claim 5, it is characterized in that, the data processing unit uses
TMS320F28335DSP。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469526.3U CN206742966U (en) | 2017-04-27 | 2017-04-27 | A kind of novel intelligent power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720469526.3U CN206742966U (en) | 2017-04-27 | 2017-04-27 | A kind of novel intelligent power supply unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206742966U true CN206742966U (en) | 2017-12-12 |
Family
ID=60563344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720469526.3U Active CN206742966U (en) | 2017-04-27 | 2017-04-27 | A kind of novel intelligent power supply unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206742966U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507936A (en) * | 2019-01-17 | 2019-03-22 | 广东电网有限责任公司 | A kind of composite type processing unit |
| CN109683060A (en) * | 2019-01-14 | 2019-04-26 | 国网江西省电力有限公司南昌供电分公司 | A kind of distribution network line state monitoring method and system |
-
2017
- 2017-04-27 CN CN201720469526.3U patent/CN206742966U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683060A (en) * | 2019-01-14 | 2019-04-26 | 国网江西省电力有限公司南昌供电分公司 | A kind of distribution network line state monitoring method and system |
| CN109507936A (en) * | 2019-01-17 | 2019-03-22 | 广东电网有限责任公司 | A kind of composite type processing unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104698320B (en) | The electric Parameter Measuring device and method of power transmission and distribution circuit | |
| CN101515015B (en) | Power quality monitoring and recording device of power system | |
| CN101498757B (en) | Real-time dynamic monitoring and recording equipment of power system | |
| CN101566641B (en) | Power system transmission line parameter synchronic measurement and recording device | |
| CN101692104A (en) | Power quality and synchronized phasor monitoring device for power system | |
| CN201368905Y (en) | Power quality monitoring and recording device of power system | |
| CN204495932U (en) | The electric Parameter Measuring device of power transmission and distribution circuit | |
| CN205453290U (en) | Intelligent substation relay protection operating condition real time kinematic monitoring and recorder | |
| CN103575971B (en) | A kind of intelligent substation universal data collection method | |
| CN201569691U (en) | Electric power quality monitoring and synchronous phasor monitoring device of power system | |
| CN105572516A (en) | Multifunctional FPGA acquisition unit with time reference output | |
| CN107105056A (en) | A kind of cloud control electric meter system based on WiFi communication | |
| CN107942168A (en) | A kind of replaceable digital and analog equipment for monitoring power quality and method | |
| CN206742966U (en) | A kind of novel intelligent power supply unit | |
| CN111064536A (en) | Power distribution network monitoring device and method based on clock synchronization | |
| CN206248746U (en) | A kind of power network electric energy quality monitoring terminal | |
| CN107947365A (en) | A kind of measure and control device for supporting intelligent substation multi-compartment concentrated collection to control and centralized observing and controlling networking | |
| CN102832713B (en) | CAN (controller area network) bus based distribution automation terminal and analog quantity acquisition method thereof | |
| CN104101806A (en) | ARM and DSP based multi-circuit power quality online monitoring device | |
| CN205404700U (en) | Take multi -functional FPGA acquisition unit of time reference output | |
| CN202503362U (en) | Distribution terminal unit integrating measurement, control and protection for intelligent distribution network | |
| CN205404703U (en) | Electric energy quality disturbance alarm system | |
| CN103259334A (en) | Three-state integrated measuring and controlling device for transformer substation | |
| CN103986231A (en) | Networked intelligent transformer substation metering system | |
| CN202583354U (en) | Network type power quality on-line monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |