CN103731029B - Voltage reducing type direct current converter - Google Patents
Voltage reducing type direct current converter Download PDFInfo
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- CN103731029B CN103731029B CN201410026107.3A CN201410026107A CN103731029B CN 103731029 B CN103731029 B CN 103731029B CN 201410026107 A CN201410026107 A CN 201410026107A CN 103731029 B CN103731029 B CN 103731029B
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- switch pipe
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a voltage reducing type direct current converter. According to the voltage reducing type direct current converter, when a first switching tube is powered on, an input power source charges for a first inductor and a first resistor; when the first switching tube is powered off and a second switching tube is powered off, the first inductor continues current through a third second diode and charges the first resistor; when the second switching tube is powered on, conduction of the second switching tube achieves zero voltage switching, the first inductor and the first resistor discharge to the second resistor through the second switching tube and a first diode to achieve voltage output due to the fact that the second switching tube keeps a conduction state; when the second switching tube is powered off, a second inductor which continues current through a second diode charges to the second resistor to achieve voltage output; when the first switching tube is powered on, conduction of the first switching tube achieves zero voltage switching. The voltage reducing type direct current converter has the advantages of achieving the zero voltage switching, improving the voltage conversing efficiency and reducing electromagnetic interference.
Description
Technical field
The present invention relates to field of circuit technology, more particularly, to a kind of buck DC converter.
Background technology
With the development of electronic technology, in voltage conversion circuit, the power conversion frequency more and more higher of power switch pipe, right
In the occasion carrying out contactor with power switch pipe, switching loss is usually quite greatly, and can produce strong electromagnetism and do
Disturb.
As shown in figure 1, in FIG, device is in hard switching state to existing non-isolated reduction voltage circuit, in switch conduction or
The moment turning off, the voltage instantaneous of switch ends change a lot, and result in electromagnetic interference seriously, switching loss is also relatively
Greatly, have impact on power supply conversion efficiency.
Content of the invention
Embodiments provide a kind of buck DC converter, to realize power in non-isolated voltage conversion circuit
Device works under Sofe Switch state, reduces switching loss, improves voltage conversion efficiency, reduces electromagnetic interference.
In a first aspect, embodiments providing a kind of buck DC converter, described buck DC converter
Including：First switch pipe, second switch pipe, the first electric capacity, the second electric capacity, the first diode, the second diode, the three or two pole
Pipe, the first inductance, the second inductance；
The first end of described first switch pipe is connected with the negative pole of the positive pole of input power, described second diode, institute
State the second end of first switch pipe and the positive pole of described second diode, the first end of described second switch pipe, the described 3rd 2
The negative pole of pole pipe, the first end of described first electric capacity are connected；
The positive pole of the second end of described second switch pipe and described 3rd diode, the first end of described first inductance, institute
The first end stating the second electric capacity is connected, the second end of the second end of described first inductance and described first electric capacity, described first
The negative pole of diode is connected；
The positive pole of described first diode is by the negative pole of the second electric capacity and input power, the second end of described second electric capacity
It is connected；
Wherein, the drive signal of the drive signal of described first switch pipe and described second switch pipe is complementary signal, and
And there is dead band between the drive signal of described first switch pipe and the drive signal of second switch pipe；
When described first switch pipe turns on, described input power is described first inductance and described first electric capacity charges；
When the shutoff of described first switch pipe, described second switch pipe are also switched off, described first inductance passes through described 3rd diode and continues
Stream, and described first electric capacity is charged；When described second switch pipe turns on, described in parallel with described second switch pipe
3rd diode is in the conduction state, and the conducting of therefore described second switch pipe achieves ZVT, with described second
Switching tube tends to remain on, and described first inductance, described first electric capacity pass through described second switch pipe, described first diode
To described second electric capacity electric discharge, realize voltage output；When described second switch pipe turns off, described second inductance passes through described the
Two diode continuousing flows, and to described second electric capacity electric discharge, realize voltage output；When described first switch pipe turns on, due to
Described first switch pipe described second diode in parallel is in the conduction state, and the conducting of therefore described first switch pipe achieves
ZVT.
According in a first aspect, in the first possible implementation, when described input power synchronous rectification, described fall
Pressure type DC converter also includes rectifier switch pipe, and described rectifier switch pipe and described second switch pipe driven in phase.
According to the first possible implementation of first aspect, in the possible implementation of second, described input
Line lock rectification is specially：Described first diode replaces with metal oxide layer-quasiconductor-field-effect transistor MOSFET, and
And described replace after MOSFET turn on when the sense of current is consistent with body diode direction.
According to the first possible implementation of first aspect or first aspect, in the third possible implementation
In, described first switch pipe and described second switch pipe are metal oxide layer-quasiconductor-field-effect transistor MOSFET；Or,
Described first switch pipe and described second switch pipe are insulated gate bipolar transistor IGBT；Or, described first switch pipe and
Described second switch pipe is bipolar junction transistor BJT.
According in a first aspect, in the 4th kind of possible implementation, described first diode, described second diode and
Described 3rd diode is independent semiconductor diode, or the parasitic diode for MOSFET element.
According to first aspect or first aspect the first, second, the 4th kind of possible implementation, at the 5th kind
In possible implementation, described buck DC converter also includes the 3rd electric capacity；The first end of described 3rd electric capacity with defeated
The positive pole entering power supply is connected, and the second end of described 3rd electric capacity is connected with the first end of described second electric capacity；Described 3rd
Electric capacity is filter capacitor, for realizing filter function to the voltage of described input power and the supply voltage of output.
In buck DC converter provided in an embodiment of the present invention, when first switch pipe turns on, input power is the
One inductance and the first electric capacity charge；When the shutoff of first switch pipe, second switch pipe are also switched off, the first inductance passes through the three or two pole
Pipe afterflow, and the first electric capacity is charged；When second switch pipe turns on, the conducting of second switch pipe achieves ZVT,
Tend to remain on second switch pipe, the first inductance, the first electric capacity pass through second switch pipe, first diode pair the second electricity
Discharge capacitor, realizes voltage output；When second switch pipe turns off, the second inductance passes through the second diode continuousing flow, and to the second electricity
Discharge capacitor, realizes voltage output；When first switch pipe turns on, the conducting of first switch pipe achieves ZVT.Thus
Switching tube in the embodiment of the present invention works in ZVT state, decreases switching loss, reduces electromagnetic interference, improves
Voltage conversion efficiency, and the drive signal of two switching tubes is complementary signal, therefore drives and simplifies.
Brief description
Fig. 1 is a kind of non-isolated reduction voltage circuit schematic diagram under prior art；
Fig. 2 is a kind of buck DC converter schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the work wave schematic diagram of the buck DC converter shown in Fig. 2 provided in an embodiment of the present invention；
Fig. 4 is the schematic equivalent circuit of the buck DC converter shown in Fig. 2 provided in an embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Fig. 2 is a kind of buck DC converter schematic diagram provided in an embodiment of the present invention, as illustrated, this buck is straight
Current converter include the first inductance L1, the second inductance L2, first switch pipe S1, second switch pipe S2, the first diode D1,
Two diode D2, the 3rd diode D3, the first electric capacity C1, the second electric capacity C2.
As shown in Fig. 2 the first end of first switch pipe S1 is connected with the positive pole of input power, the negative pole of the second diode D2
Connect, the positive pole of second end of first switch pipe S1 and the second diode D2, the first end of second switch pipe S2, the 3rd diode D3
Negative pole, the first end of the first electric capacity C1 is connected；Second end of second switch pipe S2 and the positive pole of the 3rd diode D3, first
The first end of inductance L1, the first end of the second electric capacity C2 are connected, second end of the first inductance L1 and the second of the first electric capacity C1
End, the negative pole of the first diode D1 are connected；The positive pole of the first diode D1 pass through the second electric capacity C2 and input power negative pole,
Second end of the second electric capacity C2 is connected.
Wherein, Fig. 3 is the work wave schematic diagram of the buck DC converter shown in Fig. 2 provided in an embodiment of the present invention
Wherein, in figure S1 and the waveform corresponding to S2 are the drive signal waveform of S1 and the drive signal waveform of S2；IL1It is through first
The current waveform of inductance L1, IL2It is the current waveform through the second inductance；VS2Voltage waveform for second switch pipe S2 two ends；
VS1Voltage waveform for first switch pipe S1 two ends；IS2It is the current waveform through second switch pipe S2, IS1It is to open through first
Close the current waveform of pipe S1；IoutWaveform for the electric current without filtering capacitor filtering for the buck DC converter output.Logical
The work wave crossing S1 and S2 shown in Fig. 3 can be seen that the first drive signal (i.e. the drive signal of S1) and the second driving letter
Number (drive signal of S1) is to there is dead band between complementary signal, and the first drive signal and the second drive signal, that is, first
Drive signal and the second drive signal exist simultaneously for the low level time.Wherein, Dead Time is very short, in Fig. 3, t0 and t1 it
Between time be Dead Time, the time between t2 and t3 is also Dead Time.As illustrated, this buck DC converter
Work process as follows：
1st, when first switch pipe S1 turns on, the first inductance L1 and the first electric capacity C1 starts to charge up；
2nd, when first switch pipe S1 shutoff, second switch pipe are also switched off, because the second inductance L2 is in first switch pipe S1
Do not have energy storage, so the unidirectional current of now the first inductance L1 output cannot pass through the second inductance L2, then the first inductance during conducting
L1 passes through the 3rd diode D3 afterflow and continues the first electric capacity C1 is charged；
3rd, when second switch pipe S2 turns on, because the threeth diode D3 in parallel with second switch pipe is on shape
State, it is achieved that the ZVT state of second switch pipe.
4th, continue in turn on process in second switch pipe S2, the galvanic flow direction by second switch pipe S2 is reverse
, the first inductance L1, described first electric capacity C1 pass through described second switch pipe S1, described first diode D1 to load discharge,
Achieve voltage output.
5th, when second switch pipe S2 turns off, due in second switch pipe S2 turn on process, by the second inductance L2's
Electric current is greater than the electric current by the first inductance L1, so this size of current relation can make the second inductance L2 pass through the two or two
The afterflow of pole pipe D2 is simultaneously discharged to load simultaneously, the second electric capacity is discharged, realizes voltage output.
6th, when first switch pipe S1 turns on, because the second diode D2 in parallel with first switch pipe S1 is on shape
State, it is achieved that the ZVT state of first switch pipe S1.
Above-mentioned steps 1-6 are a work process, and this buck DC converter can circulate according to step 1-6 afterwards
Work, alternately makes first switch pipe S1 and second switch pipe S2 turn on and realize ZVT, decreases switching loss, and
Improve direct current photoelectric transformation efficiency, and the alternately break-make of above-mentioned control first switch pipe S1 and second switch pipe belongs to Sofe Switch
Controlled state, can efficiently reduce electromagnetic interference.
In above-mentioned work process, the relation of the input voltage vin of buck DC converter and output voltage Vout is such as
Shown in following formula：
Vout=Vin*D/ (1+D)
Wherein, D is the duty cycle of switching of first switch pipe S1, is adjustable output voltage by adjusting duty cycle of switching D
Vout.
Because the drive signal of first switch pipe S1 and second switch pipe S2 is complementary signal, therefore the driving of switching tube is relatively
For simple.When input power is for synchronous rectification input power, the drive signal of synchronous rectification switch pipe and second switch pipe S2
For driven in phase signal, the driving of circuit is simple.
Wherein, when input power is for synchronous rectification input power, the first diode D1 needs to replace with MOSFET, and
The MOSFET after replacing is driven to turn on when the MOSFET sense of current is consistent with body diode direction by rational drive signal,
Realize synchronous rectification.
In the embodiment of the present invention, the first switch pipe S1 in buck DC converter and second switch pipe S2 can be for appointing
The all-controlled semiconductor device of meaning, non-limiting as an example, S1 and S2 can be metal oxide layer-quasiconductor-field-effect transistor
MOSFET；Or it is insulated gate bipolar transistor IGBT；Or it is bipolar junction transistor BJT.And the first diode D1,
Two diode D2 and the 3rd diode D3 are independent semiconductor diode, or the parasitic diode for MOSFET element, or
Person can also be by the equivalent function of the control realization diode to all-controlled semiconductor device.But same to input power application
During step rectification, the first diode D1 need to be replaced by the full-control type semiconductor device such as MOSFET.
Buck DC converter shown in Fig. 2 is only a kind of concrete implementation mode, and it is not intended to limit the present invention
The protection domain of embodiment, such as changes the order of in figure Tandem devices, such as the second inductance L2 in Fig. 2 and the first diode D1
Series sequence can change.Fig. 4 (a), (b), (c), (d), (e) are soft shown in Fig. 2 provided in an embodiment of the present invention
The schematic equivalent circuit of switch buck formula DC converter, therein is illustrated with the buck DC converter shown in Fig. 2 etc.
The operating circuit of effect.
Wherein, on the basis of the buck DC converter shown in Fig. 2 and Fig. 4, those skilled in the art can also be in not shadow
Increase some devices on the premise of the working condition ringing buck DC converter, such as can increase filter capacitor, filter capacitor
It is to be added between input power positive pole and negative pole, between out-put supply positive pole and negative pole；Or, because the embodiment of the present invention provides
DC converter be non-isolated topology, filter capacitor can also be connected to input power and out-put supply not common end it
Between, such as, in the buck DC converter shown in Fig. 2, the common port of input power and out-put supply is the negative of input power
Pole and the negative pole of out-put supply, then filter capacitor can also increase between input power positive pole and out-put supply positive pole, i.e. Fig. 4
The 3rd electric capacity C3 position of (d).In addition, between first switch pipe S1, the two ends of second switch pipe S2 parallel resonance electric capacity, etc.
Imitate in the parasitic capacitance increasing switch tube device, the voltage change ratio at switching device two ends can be reduced, switch can be reduced
Loss during shutoff.
It should be noted that the effect of C3 includes to input voltage and output voltage is filtered in Fig. 4 (d).This
The buck DC converter acquiescence input power that bright embodiment provides is ideal voltage source, and the buck therefore shown in Fig. 2 is straight
It is not provided with the input filter capacitor for being filtered to input voltage in current converter, and in practical application, often
Between the positive pole and negative pole of the input power of buck DC converter, setting input filter capacitor input voltage is carried out
Filtering.After being provided with input filter capacitor, the 3rd electric capacity C3 of Fig. 4 (b) and Fig. 4 (d) and input filter capacitor have public company
Contact, the 3rd electric capacity C3 is equivalent to after being connected with input capacitance and is connected between output positive and negative terminal, and effect is still to output electricity
Pressure is filtered.
It should be noted that when being not provided with input filter capacitor, the 3rd electric capacity C3 and output filter capacitor have common port,
3rd electric capacity C3 connect with output filter capacitor after Equivalent conjunction between the positive pole and negative pole of input power, to input power electricity
It is pressed with filter action.
When being provided with output filter capacitor, and when the input of circuit is voltage source, the 3rd electric capacity C3 is not required, this fall
Pressure type DC converter can also be simultaneously using input filter capacitor, output filter capacitor and the 3rd electric capacity C3, to input, output
Voltage is filtered.Increase the purpose of the 3rd electric capacity C3, mainly from the perspective of practical application, by increasing by the 3rd electric capacity
The capacity of C3 can reduce input or output filter capacitor capacity, can reduce whole buck DC converter volume and
Cost.
Thus the switching tube in buck DC converter provided in an embodiment of the present invention works in ZVT state,
Decrease switching loss, reduce electromagnetic interference, improve voltage conversion efficiency, and the drive signal of two switching tubes is mutual
Complement signal, therefore drives and simplifies.
Professional should further appreciate that, each example describing in conjunction with the embodiments described herein
Unit and algorithm steps, can be hard in order to clearly demonstrate with electronic hardware, computer software or the two be implemented in combination in
Part and the interchangeability of software, generally describe composition and the step of each example in the above description according to function.
These functions to be executed with hardware or software mode actually, the application-specific depending on technical scheme and design constraint.
Professional and technical personnel can use different methods to each specific application realize described function, but this realization
It is not considered that it is beyond the scope of this invention.
The step of the method in conjunction with the embodiments described herein description or algorithm can be with hardware, computing device
Software module, or the combination of the two is implementing.Software module can be placed in random access memory (RAM), internal memory, read only memory
(ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
In interior known any other form of storage medium.
Above-described specific embodiment, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., all should comprise
Within protection scope of the present invention.
Claims (6)
1. a kind of buck DC converter is it is characterised in that described buck DC converter includes：First switch pipe,
Two switching tubes, the first electric capacity, the second electric capacity, the first diode, the second diode, the 3rd diode, the first inductance, the second electricity
Sense；
The first end of described first switch pipe is connected with the negative pole of the positive pole of input power, described second diode, and described
The positive pole of the second end of one switching tube and described second diode, the first end of described second switch pipe, described 3rd diode
Negative pole, the first end of described first electric capacity is connected；
The positive pole of the second end of described second switch pipe and described 3rd diode, the first end of described first inductance, described the
The first end of two electric capacity is connected, the second end of the second end of described first inductance and described first electric capacity, described one or two pole
The negative pole of pipe is connected；
The positive pole of described first diode is connected with the negative pole of input power, the second end of described second electric capacity by the second inductance
Connect；
Wherein, the drive signal of the drive signal of described first switch pipe and described second switch pipe is complementary signal, and institute
State and there is dead band between the drive signal of first switch pipe and the drive signal of second switch pipe；
When described first switch pipe turns on, described input power is described first inductance and described first electric capacity charges；Work as institute
State that first switch pipe turns off, described second switch pipe is when being also switched off, described first inductance passes through described 3rd diode continuousing flow, and
Described first electric capacity is charged；When described second switch pipe turns on, due to the in parallel with described second switch pipe the described 3rd
Diode is in the conduction state, and the conducting of therefore described second switch pipe achieves ZVT, with described second switch
Pipe tends to remain on, and described first inductance, described first electric capacity pass through described second switch pipe, described first diode pair institute
State the second electric capacity electric discharge, realize voltage output；When described second switch pipe turns off, described second inductance passes through the described 2nd 2
Pole pipe afterflow, and to described second electric capacity electric discharge, realize voltage output；When described first switch pipe turns on, due to described
First switch pipe described second diode in parallel is in the conduction state, and the conducting of therefore described first switch pipe achieves zero electricity
Compress switch.
2. buck DC converter according to claim 1 is it is characterised in that work as described input power synchronous rectification
When, described buck DC converter also includes rectifier switch pipe, and described rectifier switch pipe is same with described second switch pipe
Mutually drive.
3. buck DC converter according to claim 2 is it is characterised in that described input power synchronous rectification is concrete
For：Described first diode replaces with metal oxide layer-quasiconductor-field-effect transistor MOSFET, and the MOSFET after replacing
Turn on when the sense of current is consistent with body diode direction.
4. buck DC converter according to claim 1 and 2 is it is characterised in that described first switch pipe and described
Second switch pipe is metal oxide layer-quasiconductor-field-effect transistor MOSFET；Or,
Described first switch pipe and described second switch pipe are insulated gate bipolar transistor IGBT；Or,
Described first switch pipe and described second switch pipe are bipolar junction transistor BJT.
5. buck DC converter according to claim 1 it is characterised in that described first diode, described second
Diode and described 3rd diode are independent semiconductor diode, or the parasitic diode for MOSFET element.
6. the buck DC converter according to claim 1-3 or 5 any one, described buck DC converter also wraps
Include the 3rd electric capacity；
The first end of described 3rd electric capacity is connected with the positive pole of input power, second end and described second of described 3rd electric capacity
The first end of electric capacity is connected；
Described 3rd electric capacity is filter capacitor, for realizing filtering work(to the voltage of described input power and the supply voltage of output
Energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410026107.3A CN103731029B (en) | 2014-01-20 | 2014-01-20 | Voltage reducing type direct current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410026107.3A CN103731029B (en) | 2014-01-20 | 2014-01-20 | Voltage reducing type direct current converter |
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| CN103731029A CN103731029A (en) | 2014-04-16 |
| CN103731029B true CN103731029B (en) | 2017-02-08 |
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| CN201410026107.3A Active CN103731029B (en) | 2014-01-20 | 2014-01-20 | Voltage reducing type direct current converter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106026641B (en) * | 2016-06-29 | 2019-04-16 | 儒竞艾默生环境优化技术（上海）有限公司 | A kind of step-down type dc translation circuit, transformer and transform method |
| CN109347465B (en) * | 2018-10-29 | 2022-09-16 | 阳光电源（上海）有限公司 | Switching tube driving circuit, turn-off device and distributed power generation system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5343140A (en) * | 1992-12-02 | 1994-08-30 | Motorola, Inc. | Zero-voltage-switching quasi-resonant converters with multi-resonant bipolar switch |
| CN1713497A (en) * | 2004-06-25 | 2005-12-28 | 台达电子工业股份有限公司 | Soft switching DC/DC converter with less assembly |
| CN101404447A (en) * | 2008-03-12 | 2009-04-08 | 北方工业大学 | Soft switch BUCK converter and its design method |
| CN102710121A (en) * | 2012-05-31 | 2012-10-03 | 南京航空航天大学 | Non-isolation type switching electric capacity adjuster for soft switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012100490A (en) * | 2010-11-04 | 2012-05-24 | Kawasaki Heavy Ind Ltd | Step-down chopper using resonance switch, and power supply system |
-
2014
- 2014-01-20 CN CN201410026107.3A patent/CN103731029B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5343140A (en) * | 1992-12-02 | 1994-08-30 | Motorola, Inc. | Zero-voltage-switching quasi-resonant converters with multi-resonant bipolar switch |
| CN1713497A (en) * | 2004-06-25 | 2005-12-28 | 台达电子工业股份有限公司 | Soft switching DC/DC converter with less assembly |
| CN101404447A (en) * | 2008-03-12 | 2009-04-08 | 北方工业大学 | Soft switch BUCK converter and its design method |
| CN102710121A (en) * | 2012-05-31 | 2012-10-03 | 南京航空航天大学 | Non-isolation type switching electric capacity adjuster for soft switch |
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Effective date of registration: 20211116 Address after: 518043 No. 01, 39th floor, building a, antuoshan headquarters building, No. 33, antuoshan Sixth Road, Xiang'an community, Xiangmihu street, Futian District, Shenzhen, Guangdong Province Patentee after: Huawei Digital Energy Technology Co., Ltd Address before: 518129 Huawei headquarters office building, Bantian, Longgang District, Shenzhen, Guangdong Patentee before: Huawei Technology Co., Ltd |
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