CN111952986A - High-performance power supply and method for direct current electric arc furnace - Google Patents
High-performance power supply and method for direct current electric arc furnace Download PDFInfo
- Publication number
- CN111952986A CN111952986A CN202010687320.4A CN202010687320A CN111952986A CN 111952986 A CN111952986 A CN 111952986A CN 202010687320 A CN202010687320 A CN 202010687320A CN 111952986 A CN111952986 A CN 111952986A
- Authority
- CN
- China
- Prior art keywords
- power supply
- power
- current
- arc furnace
- phase
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a high-performance power supply and a method for a direct current electric arc furnace, and belongs to the technical field of power supplies. The device includes: the device comprises a vacuum circuit breaker, a pre-charging circuit, a multi-winding phase-shifting transformer, a plurality of chopping power units, an output isolating switch, a power supply controller and a signal acquisition unit; compared with the traditional thyristor phase-controlled rectifying power supply, the invention provides the high-performance direct current electric arc furnace power supply which has high power factor in a full power range, small harmonic content and large-range continuous adjustment of direct current side output voltage and current, and solves the problems of over low power factor, complex power supply structure and low production efficiency of the traditional direct current electric arc furnace.
Description
Technical Field
The invention belongs to the technical field of power supplies, and relates to a power supply and a method for a high-performance direct current electric arc furnace.
Background
At present, most of processes of iron and steel enterprises are long-flow steelmaking with high pollution, high energy consumption and high raw materials, and the problems of environmental unfriendliness, high environmental protection pressure and the like exist. Compared with long-flow steelmaking, the short-flow steelmaking method which is mainstream in the world at present has the advantages of less primary investment, short construction period, energy consumption saving, carbon emission reduction and the like, so that the short-flow steelmaking method has good application prospect.
The short-process steelmaking uses an electric arc furnace as smelting equipment, can be divided into alternating current electric arc furnace steelmaking and direct current electric arc furnace steelmaking according to different types of power supplies, and has more inherent technical advantages and good development prospect because the direct current electric arc does not have the problems of zero-crossing shutdown and the like.
The power supply of the traditional direct current electric arc furnace adopts the system structure shown in figure 1, compared with the alternating current electric arc furnace, a thyristor rectification power supply part is added, and in addition, a large-capacity reactive power compensation and filtering device still needs to be configured for the system to improve the power factor and reduce the current harmonic wave on the network side. Particularly, in the middle and later stages of smelting, along with the reduction of load, the power factor and harmonic problems of the traditional direct current electric arc furnace power supply are more serious, and reactive compensation and a filtering device are indispensable, so that the traditional direct current electric arc furnace power supply has the problems of high investment, large floor area, easy occurrence of overcompensation and the like, which is an important reason for restricting the application of the direct current electric arc furnace.
In addition, in order to prevent the power factor of the system from being too low, the regulating capability of the thyristor rectifying power supply of the traditional direct-current electric arc furnace to the output voltage is very limited, the regulation of the arc voltage is realized only by regulating the lifting of the electrode in practical application, the abrasion of a mechanical part is easily caused, and the control is not flexible. The added thyristor electronic device has weak self shock resistance, and the thyristor is easy to damage under the large-current application working conditions such as an electric arc furnace power supply and the like which require quick response and sudden change, thereby further limiting the development of the traditional direct current electric arc furnace.
Disclosure of Invention
In view of the above, the present invention provides a power supply and method for a high performance dc arc furnace, which solves the problems of low power factor, complex power structure and low production efficiency of the existing dc arc furnace.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-performance DC arc furnace power supply comprises a vacuum circuit breaker, a pre-charging circuit, a multi-winding phase-shifting transformer, a plurality of chopping power units, an output isolating switch, a power supply controller and a signal acquisition unit;
the primary side of the multi-winding phase-shifting transformer is connected with an alternating current power grid through a vacuum circuit breaker and a pre-charging circuit, and the secondary side of the multi-winding phase-shifting transformer is connected to the input end of each chopping power unit and supplies power to an electric furnace load through an isolating switch after rectification and voltage reduction of the chopping power units;
the power supply of the direct current electric arc furnace is configured with the number of phase-shifting transformers, the number of secondary windings and phase shifting angles according to the system power; the phase-shifting transformer plays a role in voltage reduction so that a low-voltage chopping power unit can be connected to a medium-high voltage power grid and is 10-35 kV, and on the other hand, the multi-winding phase-shifting design is adopted so that grid-connected current harmonics can be reduced;
the power supply of the direct-current electric arc furnace comprises a plurality of groups of PWM rectification and Buck circuit chopping power units, the input end of each chopping power unit is connected to a secondary winding of the phase-shifting transformer, and the output ends of the plurality of groups of chopping power units are connected in parallel and converged to supply power to the load of the direct-current electric arc furnace through a short network.
Optionally, the power device in the chopping power unit is an IGBT, an IGCT, or an IEGT;
the chopping power unit adopts a carrier phase-shifting control method, so that ripple current output by the power unit in parallel is reduced, and smelting production efficiency is improved;
the power supply of the direct current electric arc furnace comprises a DSP chip which is used as a main control chip and is assisted by a high-precision peripheral hardware circuit to form a power supply controller;
the power supply controller receives signals such as three-phase alternating current input voltage and input current, direct current bus voltage, direct current output voltage and output current sampled by the signal acquisition unit, and outputs control pulses of the PWM rectifier and the Buck circuit through a fuzzy recognition closed-loop control strategy.
The power supply method of the high-performance direct-current electric arc furnace based on the power supply comprises the following steps:
the method comprises the following steps: respectively collecting three-phase voltage and three-phase current of grid connection of a power supply of the direct current arc furnace, and calculating to obtain a module value e of the current grid voltagemoPhase angle theta, and d and q axis components i of currentd、iqPreparing for subsequent control;
step two: the module value e of the current power grid voltagemoAnd a set value e* gridInputting the voltage into a first regulator, judging whether the current power supply device needs to send certain reactive power to compensate the power grid drop or not, and obtaining a reactive current given value i* q；
Step three: setting the current DC bus voltage and the DC bus voltage given by the intelligent arc-stabilizing controller to V* busInputting the current into a third regulator to obtain an active current given value i* d；
Step four: according to the reactive current and active current set values obtained in the second step and the third step, Pulse 1-6 pulses are obtained through vector control;
step five: output a direct current IdcAnd the intelligent arc stabilization controller gives a set value I 'after a slope'dcAnd (4) inputting the difference to a lower-level PI parameter fuzzy controller, and performing carrier phase shift control to obtain pulses of Pulse 7-8.
The invention has the beneficial effects that:
(1) the large-range continuous adjustment of the output voltage and current at the direct current side can be realized through a fuzzy identification closed-loop control strategy;
(2) the direct-current bus capacitor intermediate energy storage link is included, the voltage of a grid-connected point cannot be directly influenced by the severe change of the load condition, and the problem of voltage flashover of the grid-connected point is fundamentally solved;
(3) the network side adopts PWM controllable rectification, so that the device can operate near a power factor of 1 in a full power range, and when voltage sag problems such as flicker and the like occur in the voltage of a grid-connected point, the power supply device can generate certain reactive power compensation voltage drop, thereby achieving the effect of really omitting a reactive power compensation device;
(4) a high-frequency LCL filter is adopted, the size of a filter device is small, the harmonic content is low, the network side current THD is within 3% after the filter device is matched with a phase-shifting transformer, and the filter device can be completely omitted;
(5) the traditional direct current electric arc furnace power transformer has a plurality of voltage regulating taps, and has the defects of high manufacturing cost, easy damage of mechanical parts, high maintenance cost and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a power supply system for a conventional DC arc furnace;
FIG. 2 is a schematic diagram of a DC arc furnace power supply apparatus according to the present invention;
FIG. 3 is a schematic diagram of a chopper power cell according to the present invention;
FIG. 4 is a schematic diagram of the control system of the DC arc furnace power supply apparatus according to the present invention;
FIG. 5 is a schematic diagram of a control strategy of a power supply device for a DC arc furnace according to the present invention;
FIG. 6 is a schematic diagram of a power supply apparatus for a DC arc furnace according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a control system of a DC arc furnace power supply device according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 2 to 6, for the present embodiment, a five-winding set design of the transformer is taken as an example to meet the requirement of system power output, and five chopping power units are respectively connected after five amplitude windings of the phase-shifting transformer shift phases of 0 °, ± 12 °, ± 24 °.
The acquisition unit is responsible for acquiring signals such as three-phase alternating current input voltage and input current, direct current bus voltage, direct current output voltage and output current of a power grid, and transmitting the signals to the power supply controller through optical fibers.
The power supply controller of the embodiment adopts a DSP + FPGA system architecture, and is responsible for receiving detection signals of a sampling unit, outputting control pulses of PWM rectifiers and Buck circuits of 5 power units through a fuzzy recognition closed-loop control strategy, operating peripheral switches and receiving switch feedback states, and carrying out EtherCAT high-speed real-time communication with a superior process controller.
In addition to EtherCAT communication, the power controller of this embodiment adopts optical fiber communication for signal transmission with the peripheral interface, so as to reduce signal interference.
The process controller of the embodiment adopts high-performance IPC, is in charge of arc flow optimization control, lifting control of the electrode actuating mechanism and the like, and is in communication with a human-computer interface through a Modbus protocol. After the human-computer interface uploads the data to the cloud platform through the local edge gateway, the data are displayed by a remote monitoring and mobile phone APP end, and observation, operation and maintenance of related personnel are facilitated.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. The utility model provides a high performance direct current electric arc furnace power supply which characterized in that: the power supply comprises a vacuum circuit breaker, a pre-charging circuit, a multi-winding phase-shifting transformer, a plurality of chopping power units, an output isolating switch, a power supply controller and a signal acquisition unit;
the primary side of the multi-winding phase-shifting transformer is connected with an alternating current power grid through a vacuum circuit breaker and a pre-charging circuit, and the secondary side of the multi-winding phase-shifting transformer is connected to the input end of each chopping power unit and supplies power to an electric furnace load through an isolating switch after rectification and voltage reduction of the chopping power units;
the power supply of the direct current electric arc furnace is configured with the number of phase-shifting transformers, the number of secondary windings and phase shifting angles according to the system power; the phase-shifting transformer plays a role in voltage reduction so that a low-voltage chopping power unit can be connected to a medium-high voltage power grid and is 10-35 kV, and on the other hand, the multi-winding phase-shifting design is adopted so that grid-connected current harmonics can be reduced;
the power supply of the direct-current electric arc furnace comprises a plurality of groups of PWM rectification and Buck circuit chopping power units, the input end of each chopping power unit is connected to a secondary winding of the phase-shifting transformer, and the output ends of the plurality of groups of chopping power units are connected in parallel and converged to supply power to the load of the direct-current electric arc furnace through a short network.
2. A high performance dc arc furnace power supply according to claim 1, wherein: the power device in the chopping power unit is an IGBT, an IGCT or an IEGT;
the chopping power unit adopts a carrier phase-shifting control method, so that ripple current output by the power unit in parallel is reduced, and smelting production efficiency is improved;
the power supply of the direct current electric arc furnace comprises a DSP chip which is used as a main control chip and is assisted by a high-precision peripheral hardware circuit to form a power supply controller;
the power supply controller receives signals such as three-phase alternating current input voltage and input current, direct current bus voltage, direct current output voltage and output current sampled by the signal acquisition unit, and outputs control pulses of the PWM rectifier and the Buck circuit through a fuzzy recognition closed-loop control strategy.
3. The power supply method of the high-performance direct-current electric arc furnace based on the power supply source of claim 1 or 2 is characterized in that: the method comprises the following steps:
the method comprises the following steps: respectively collecting three-phase voltage and three-phase current of grid connection of a power supply of the direct current arc furnace, and calculating to obtain a module value e of the current grid voltagemoPhase angle theta, and d and q axis components i of currentd、iqPreparing for subsequent control;
step two: the module value e of the current power grid voltagemoAnd a set value e* gridInputting the voltage into a first regulator, judging whether the current power supply device needs to send certain reactive power to compensate the power grid drop or not, and obtaining a reactive current given value i* q；
Step three: setting the current DC bus voltage and the DC bus voltage given by the intelligent arc-stabilizing controller to V* busInputting the current into a third regulator to obtain an active current given value i* d；
Step four: according to the reactive current and active current set values obtained in the second step and the third step, Pulse 1-6 pulses are obtained through vector control;
step five: output a direct current IdcAnd the intelligent arc stabilization controller gives a set value I 'after a slope'dcAnd (4) inputting the difference to a lower-level PI parameter fuzzy controller, and performing carrier phase shift control to obtain pulses of Pulse 7-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687320.4A CN111952986A (en) | 2020-07-16 | 2020-07-16 | High-performance power supply and method for direct current electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010687320.4A CN111952986A (en) | 2020-07-16 | 2020-07-16 | High-performance power supply and method for direct current electric arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111952986A true CN111952986A (en) | 2020-11-17 |
Family
ID=73341592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010687320.4A Pending CN111952986A (en) | 2020-07-16 | 2020-07-16 | High-performance power supply and method for direct current electric arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111952986A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787353A (en) * | 2021-01-25 | 2021-05-11 | 清华大学 | Hybrid flexible power supply system of alternating current electric arc furnace and control method thereof |
| CN113675848A (en) * | 2021-09-14 | 2021-11-19 | 中冶赛迪工程技术股份有限公司 | Power supply control device, device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5638263A (en) * | 1994-03-01 | 1997-06-10 | Halmar Robicon Group | Low and medium voltage PWM AC/DC power conversion method and apparatus |
| CN202103587U (en) * | 2011-06-30 | 2012-01-04 | 西安华恒新能科技有限公司 | Direct current supply power source for polycrystalline silicon ingot furnace |
| CN104578834A (en) * | 2013-10-15 | 2015-04-29 | 高毅夫 | High-performance direct-current power supply implementation method of direct-current electric arc furnace |
| CN110247562A (en) * | 2019-06-14 | 2019-09-17 | 中冶赛迪工程技术股份有限公司 | A kind of power supply unit and method of supplying power to of direct current electric arc furnace |
| CN110350606A (en) * | 2019-06-27 | 2019-10-18 | 荣信汇科电气技术有限责任公司 | A kind of electric arc furnaces DC chopped-wave power supply device and method |
-
2020
- 2020-07-16 CN CN202010687320.4A patent/CN111952986A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5638263A (en) * | 1994-03-01 | 1997-06-10 | Halmar Robicon Group | Low and medium voltage PWM AC/DC power conversion method and apparatus |
| CN202103587U (en) * | 2011-06-30 | 2012-01-04 | 西安华恒新能科技有限公司 | Direct current supply power source for polycrystalline silicon ingot furnace |
| CN104578834A (en) * | 2013-10-15 | 2015-04-29 | 高毅夫 | High-performance direct-current power supply implementation method of direct-current electric arc furnace |
| CN110247562A (en) * | 2019-06-14 | 2019-09-17 | 中冶赛迪工程技术股份有限公司 | A kind of power supply unit and method of supplying power to of direct current electric arc furnace |
| CN110350606A (en) * | 2019-06-27 | 2019-10-18 | 荣信汇科电气技术有限责任公司 | A kind of electric arc furnaces DC chopped-wave power supply device and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787353A (en) * | 2021-01-25 | 2021-05-11 | 清华大学 | Hybrid flexible power supply system of alternating current electric arc furnace and control method thereof |
| CN113675848A (en) * | 2021-09-14 | 2021-11-19 | 中冶赛迪工程技术股份有限公司 | Power supply control device, device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102916437B (en) | The soft combination method of a kind of grid-connected converter | |
| CN102223090B (en) | High-power simplified electrolytic and electroplating high-frequency switch power supply and control method thereof | |
| CN109217687A (en) | Power distribution network electric power electric transformer and its control method based on MMC | |
| WO2023179029A1 (en) | Control method for offshore wind power uncontrolled rectifier direct-current power transmission system | |
| CN110086355B (en) | High-frequency control compensation type controllable alternating current distribution transformer | |
| CN110350606B (en) | DC chopper power supply device and method for electric arc furnace | |
| CN110729909B (en) | Multi-port railway power regulator system and comprehensive control method thereof | |
| CN110920422B (en) | High-power electric vehicle charging device based on current source and control method | |
| CN111900884A (en) | Power electronic transformation equipment of direct current distribution network and control method thereof | |
| CN202353232U (en) | High-voltage cascaded inverter power unit grid-connection feedback device | |
| CN111952986A (en) | High-performance power supply and method for direct current electric arc furnace | |
| CN104993713A (en) | Control method for double PWM solid-state transformer | |
| CN102496950A (en) | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter | |
| CN114498718B (en) | Flexible traction substation and control method thereof | |
| CN211880102U (en) | Multifunctional four-quadrant converter | |
| CN111952987A (en) | Direct current electric arc furnace rectification power supply device and control method | |
| CN110739701A (en) | low-voltage distribution network line low-voltage treatment system and treatment method | |
| CN217692677U (en) | Station service power electronic transformation system | |
| CN108683353A (en) | Substation's energy-saving multifunctional integration charge and discharge device and control method | |
| CN107026475B (en) | A kind of distributed solar electricity generation system enters network control method | |
| CN202797977U (en) | Power electronic system combining voltage support with fault current limiting | |
| CN113141121B (en) | Current source type high-frequency isolation matrix type cascade converter and control method | |
| CN107370396A (en) | A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network | |
| CN115912944B (en) | Water electrolysis hydrogen production power supply, control method and hydrogen production system | |
| CN113381435B (en) | Flexible loop closing device and control method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201117 |