CN113098269A - Direct current converter for electric automobile charging pile - Google Patents
Direct current converter for electric automobile charging pile Download PDFInfo
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- CN113098269A CN113098269A CN202110362100.9A CN202110362100A CN113098269A CN 113098269 A CN113098269 A CN 113098269A CN 202110362100 A CN202110362100 A CN 202110362100A CN 113098269 A CN113098269 A CN 113098269A
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- 239000003990 capacitor Substances 0.000 claims description 60
- 230000009467 reduction Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 19
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a direct current converter for an electric vehicle charging pile. This resonant circuit adopts the second grade transform structure, including preceding stage buck circuit and back level boost circuit, can provide stable output current for back level boost converter according to preceding stage buck converter's structure, has longer life, can still provide higher output level under the discontinuous circumstances of electric current, and back level boost circuit can effectively reduce the output ripple.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a direct-current converter for an electric automobile charging pile.
Background
Buck-boost dc-dc converters have long been known. The present invention relates to a switching converter which operates alternately or in the transition region simultaneously in the manner of a step-up converter and in the manner of a step-down converter. In many cases, a common reactor and a common input filter and a common output filter are provided in the respective charging post circuit arrangements. The coupling degree is high, the control is greatly influenced, the control is difficult to realize under the condition of input voltage fluctuation, and the stable operation of the rear-stage circuit needs the front-stage circuit to provide stable and reliable output to ensure the high-efficiency operation of the rear-stage circuit. The conventional buck-boost circuit (shown in fig. 1) has difficulty in achieving the above requirements.
Disclosure of Invention
The invention provides a direct current converter for an electric vehicle charging pile, wherein a front-stage circuit can provide stable output for a rear-stage circuit, the duty ratio of the circuit is allowed to work in a wider range, and the control robustness is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a direct current converter for an electric vehicle charging pile comprises a voltage reduction circuit at the front stage and a voltage boosting circuit at the rear stage, wherein the positive electrode of an input power source Uin is connected with one end of a switching tube S, the other end of the switching tube S is connected with the cathode of a diode D1 and one end of an inductor L1, the other end of the inductor L1 is connected with the anode of a diode D3, the cathode of a diode D2 and one end of a capacitor C1, the cathode of the diode D3 is connected with one end of an inductor L2, the other end of a capacitor C1 is connected with the other end of the inductor L2 and one end of a capacitor C2, the connection point of the other end of the inductor L2 and one end of a capacitor C2 is connected with the connection point of one end of a capacitor C3 and one end of a capacitor C4, the connection point of one end of the capacitor C3 and one end of a capacitor C5 is connected with one end of an inductor L57323, the other end of the inductor L3 is connected with the anode of a, a diode D5 is connected in parallel with a branch of a diode D4 and an inductor L4, the anode of the diode D5 is connected with the anode of a diode D4, the cathode of a diode D5 is connected with the other end of an inductor L4, switching tubes S1, S2, S3 and S4 form an H-bridge circuit, switching tubes S1 and S4 form a first bridge arm, switching tubes S2 and S3 form a second bridge arm, the other end of the inductor L4 is connected with the midpoint of the first bridge arm, one end of an inductor L5 is connected with the midpoint of the second bridge arm, the other end of the inductor L5 is connected with one end of an output capacitor C0, the upper end of the H-bridge circuit is connected with the other end of the capacitor C0, the lower end of the H-bridge circuit, the other end of the capacitor C0, the other end of the capacitor C0, the anode of the diode; each switching tube is an IGBT or an MOSFET.
Drawings
FIG. 1: the structure schematic diagram of the existing step-down and step-up DC-DC converter;
FIG. 2: the structure schematic diagram of the direct current converter for the electric vehicle charging pile is shown;
FIG. 3: the first-stage working energy flow schematic diagram of the preceding-stage voltage reduction circuit;
FIG. 4: the working energy flow diagram of the second stage of the preceding-stage voltage reduction circuit;
FIG. 5: the third-stage working energy flow schematic diagram of the preceding-stage voltage reduction circuit;
FIG. 6: the working energy flow diagram of the fourth stage of the preceding-stage voltage reduction circuit;
FIG. 7: the working energy flow diagram of the fifth stage of the preceding-stage voltage reduction circuit;
FIG. 8: the working energy flow diagram of the first stage of the post-stage booster circuit;
FIG. 9: the second-stage working energy flow diagram of the post-stage boosting circuit;
FIG. 10: the third-stage working energy flow diagram of the post-stage booster circuit;
FIG. 11: and the fourth stage working energy flow diagram of the post-stage booster circuit.
Detailed Description
As shown in fig. 2, the dc converter for an electric vehicle charging pile according to the present invention has a specific structure in which the positive electrode of an input power source Uin is connected to one end of a switching tube S, the other end of the switching tube S is connected to the cathode of a diode D1 and one end of an inductor L1, the other end of the inductor L1 is connected to the anode of a diode D3, the cathode of a diode D2 and one end of a capacitor C1, the cathode of a diode D3 is connected to one end of an inductor L2, the other end of a capacitor C1 is connected to the other end of an inductor L2 and one end of a capacitor C2, the connection point of the other end of the inductor L2 and one end of a capacitor C2 is connected to the connection point 6959 and one end of a capacitor C2, the connection point of one end of a capacitor C3 and one end of a capacitor C4 is connected to one end of an inductor L3, the other end of an inductor L3 is connected to the anode of a diode D867, the cathode of a diode D4 is connected to one end of a, an anode of the diode D5 is connected with an anode of the diode D4, a cathode of the diode D5 is connected with the other end of the inductor L4, the switching tubes S1, S2, S3 and S4 form an H-bridge circuit, the switching tubes S1 and S4 form a first bridge arm, the switching tubes S2 and S3 form a second bridge arm, the other end of the inductor L4 is connected with the midpoint of the first bridge arm, one end of the inductor L5 is connected with the midpoint of the second bridge arm, the other end of the inductor L5 is connected with one end of the output capacitor C0, an upper end of the H-bridge circuit is connected with the other end of the capacitor C4, the other end of the capacitor C0, a lower end of the H-bridge circuit, the other end of the capacitor C5, the other end of the capacitor C3, the other end of the capacitor C2, an anode of the diode D2 and an anode of the diode D1 are connected with a cathode of.
The working principle of the buck-boost DC-DC converter for the electric vehicle charging pile of the invention is explained with reference to the accompanying fig. 2-11;
the converter mainly comprises two parts, wherein the front stage is a buck converter, the rear stage is a boost converter, the front stage buck converter provides energy for the rear stage boost converter, and the converter is different from the existing buck circuit. The working condition of the preceding-stage voltage reduction circuit is as follows:
the first stage is as follows: as shown in fig. 3, the switching tube S is turned on, the diode D1 and the diode D2 are in a reverse cut-off state and are not turned on, at this time, the energy of the input voltage Uin charges the inductor L1 and the capacitor C1, the inductor L2 and the capacitor C2 are charged through the diode D3, energy required by the post-stage boost circuit is generated, and kirchhoff voltage and current law are satisfied at each node;
and a second stage: as shown in fig. 4, the switching tube S is turned off, at this time, the diode D2 is in a reverse cut-off state due to the reverse induced voltage of L1, and the diode D1 is turned on to form a freewheeling circuit, at this time, the energy of the inductor L1 is transferred to the capacitor C1, the inductor L2 and the capacitor C2, and the energy required by the subsequent boost circuit is generated;
and a third stage: as shown in fig. 5, the switch tube S is still in an off state, at this time, as the energy of the inductor L1 decreases, the diode D2 will be in a forward bias state and turned on, the diode D1 and the diode D2 together form a freewheeling circuit, at this time, the energy stored in the capacitor C1 and the energy stored in the inductor L1 will be released to the inductor L2 and the capacitor C2 together, and the energy required by the subsequent boost circuit is generated; at this time, if the switching tube S is conducted next, one switching cycle is completed, and the circuit state of the first stage is returned;
a fourth stage: as shown in fig. 6, if the switching tube S is still in the off state, the energy of the inductor L1 continues to decrease, and the current in the inductor L1 will be in the intermittent operation state, and based on the circuit structure of the buck converter, the diode D1 will be in the off state at this time, the diode D2 will continue to operate as a freewheeling diode, the energy stored in the capacitor C1 and the energy in the inductor L2 continue to discharge to the capacitor C2, and the current in the inductor L2 is ensured to operate in the continuous state, and the energy required by the subsequent boost circuit continues to be generated; if the switching tube S is conducted next, one switching period is finished, and the circuit state of the first stage is returned;
the fifth stage: as shown in fig. 7, if the switching tube S is still in the off state, the energy in the capacitor C1 and the inductor L2 is exhausted, and the current in the inductor L2 will be in the intermittent operation state, then the diode D2 and the diode D3 will also be turned off, and at this time, only the energy in the capacitor C2 is left for the subsequent boost circuit to operate; if the switching tube S is subsequently switched on, a switching cycle will be completed and the circuit state will return to the first stage.
Through the working stages, the circuit structure ensures the reliability of providing energy for the post-stage booster circuit, allows the duty ratio of the circuit to work in a wider range, and improves the robustness of control.
Under the condition that the power supply of the front-stage circuit is reliable, the working condition of the back-stage boosting circuit is as follows:
the first stage is as follows: as shown in fig. 8, the switching tubes S1 and S3 are turned on, the switching tubes S2 and S4 are turned off, the diode D5 is turned off due to a reverse voltage drop, the diode D4 is in a forward bias conducting state, one path of current from the preceding stage circuit charges the capacitor C5 through the capacitor C4 and the inductor L4, and the other path charges the capacitor C5 through the inductor L3;
and a second stage: as shown in fig. 9, the switching tubes S1 and S2 are turned on, the switching tubes S3 and S4 are turned off, the diode D5 is turned off due to a reverse voltage drop, the diode D4 is in a forward bias conducting state, one path of current from the preceding stage circuit charges the inductor L5 and the capacitor C0 through the capacitor C4, and the other path charges the capacitor C5 through the inductor L3;
and a third stage: as shown in fig. 10, the switching tubes S2 and S4 are turned on, the switching tubes S1 and S3 are turned off, the diode D5 is in a forward biased on state, and the diode D4 is turned off due to a reverse voltage drop, at this time, the energy stored in the capacitor C4, the inductor L3, the inductor L4 and the capacitor C5 will charge the inductor L5 and the capacitor C0 through the reverse diode of the switching tube S1 and the switching tube S2, so as to release the energy;
a fourth stage: as shown in fig. 11, the switches S3 and S4 are turned on, the switches S1 and S2 are turned off, the diode D5 is in a forward biased on state, and the diode D4 is turned off due to a reverse voltage drop, at this time, a current from a previous stage circuit stores energy in the inductors L3 and L4 and the capacitor C5, the inductor L5 releases the stored energy to the capacitor C0, and freewheeling is achieved through the anti-parallel diode of the switch S3.
Energy conversion is completed through the four stages, boost output is achieved, and output ripples are effectively reduced.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (3)
1. The utility model provides an electric automobile fills direct current converter for electric pile which characterized in that: the power supply circuit comprises two stages of circuits, wherein the front stage is composed of a voltage reduction circuit and provides energy for the rear stage circuit, and the rear stage is composed of a voltage boosting circuit and forms output voltage.
2. The dc converter of claim 1, wherein: the connection relationship of the circuit is that the anode of an input power source Uin is connected with one end of a switch tube S, the other end of the switch tube S is connected with the cathode of a diode D1 and one end of an inductor L1, the other end of the inductor L1 is connected with the anode of a diode D3, the cathode of a diode D2 and one end of a capacitor C1, the cathode of a diode D3 is connected with one end of an inductor L2, the other end of a capacitor C1 is connected with the other end of an inductor L2 and one end of a capacitor C2, the connection point of the other end of an inductor L2 and one end of a capacitor C2 is connected with the connection point of one end of a capacitor C3 and one end of a capacitor C4, the connection point of one end of a capacitor C3 and one end of a capacitor C3 is connected with one end of an inductor L3, the other end of the inductor L3 is connected with the anode of a diode D3, the cathode of the diode D3 is connected with one end of the diode D3 and one end of the inductor L36, the cathode of the diode D5 is connected with the other end of the inductor L4, the switching tubes S1, S2, S3 and S4 form an H-bridge circuit, the switching tubes S1 and S4 form a first bridge arm, the switching tubes S2 and S3 form a second bridge arm, the other end of the inductor L4 is connected with the midpoint of the first bridge arm, one end of the inductor L5 is connected with the midpoint of the second bridge arm, the other end of the inductor L5 is connected with one end of the output capacitor C0, the upper end of the H-bridge circuit is connected with the other end of the capacitor C4, the other end of the capacitor C0, the lower end of the H-bridge circuit, the other end of the capacitor C5, the other end of the capacitor C3, the other end of the capacitor C2, the anode of the diode D2 and the anode of the diode D1 are connected to the cathode of the input power source Uin.
3. The dc converter of claim 1, wherein: each switching tube is an IGBT or an MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110362100.9A CN113098269A (en) | 2021-04-02 | 2021-04-02 | Direct current converter for electric automobile charging pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110362100.9A CN113098269A (en) | 2021-04-02 | 2021-04-02 | Direct current converter for electric automobile charging pile |
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| Publication Number | Publication Date |
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| CN113098269A true CN113098269A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110362100.9A Pending CN113098269A (en) | 2021-04-02 | 2021-04-02 | Direct current converter for electric automobile charging pile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332821A (en) * | 2010-07-12 | 2012-01-25 | Abb公司 | Current-fed converter with quadratic conversion ratio |
| TW201414158A (en) * | 2012-09-26 | 2014-04-01 | Nat Univ Tsing Hua | Down-convert converter |
| CN111711227A (en) * | 2020-07-22 | 2020-09-25 | 阳光电源股份有限公司 | Photovoltaic power generation system and starting control method thereof |
-
2021
- 2021-04-02 CN CN202110362100.9A patent/CN113098269A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332821A (en) * | 2010-07-12 | 2012-01-25 | Abb公司 | Current-fed converter with quadratic conversion ratio |
| TW201414158A (en) * | 2012-09-26 | 2014-04-01 | Nat Univ Tsing Hua | Down-convert converter |
| CN111711227A (en) * | 2020-07-22 | 2020-09-25 | 阳光电源股份有限公司 | Photovoltaic power generation system and starting control method thereof |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220609 Address after: 102200 No. 16 Nanzhong Road, Nanshao Town, Changping District, Beijing Applicant after: BEIJING STATE GRID PURUI EXTRA-HIGH VOLTAGE POWER TRANSMISSION TECHNOLOGY Co.,Ltd. Applicant after: NARI Group Corp. Address before: 102200 No. 16 Nanzhong Road, Nanshao Town, Changping District, Beijing Applicant before: BEIJING STATE GRID PURUI EXTRA-HIGH VOLTAGE POWER TRANSMISSION TECHNOLOGY Co.,Ltd. |
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