CN107342687B - Bidirectional Buck-Boost converter circuit and control method thereof - Google Patents
Bidirectional Buck-Boost converter circuit and control method thereof Download PDFInfo
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- CN107342687B CN107342687B CN201710700720.2A CN201710700720A CN107342687B CN 107342687 B CN107342687 B CN 107342687B CN 201710700720 A CN201710700720 A CN 201710700720A CN 107342687 B CN107342687 B CN 107342687B
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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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- 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
- H02M3/157—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 with digital control
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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
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a bidirectional Buck-Boost converter circuit which comprises a power main circuit consisting of 10 power switch tubes QCo 1-QCo 5 and QBu 1-QBu 5, wherein each power switch tube is internally provided with a power diode which is correspondingly DBO 1-DBO 5 and DBu 1-DBu 5, the whole power circuit comprises a power inductor LB, 4 capacitors CBT, co 1-Co 3 and a digital control system, the digital control system comprises a PWM signal isolation amplification module, a synchronous stacking control algorithm module and an MIMO filtering module, and output control signals sQCo 1-sQCo 5 and sQBu 1-sQBu 5 of the digital control system are respectively connected to control ends of 10 power switch tubes QCo 1-QBu 5 and QBu 1-QBu 5 through control buses. The control method of the invention greatly reduces the voltage stress of the high-voltage end capacitor and prolongs the service life of the capacitor by adopting the synchronous stack control technology and the circuit structure.
Description
Technical Field
The invention relates to a converter circuit, in particular to a bidirectional Buck-Boost converter circuit and a control method thereof.
Background
With the rapid development of the related technologies of electric vehicles, the corresponding energy conversion and storage technologies are also continuously developed, wherein the bidirectional converter technology can be widely applied to tests of capacity grading cabinets, parameter matching and the like of power batteries due to the fact that the utilization rate of energy can be improved to the maximum extent. The electric automobile is a key technology which takes a vehicle-mounted power supply as power and has 4 aspects to be solved in the development of the electric automobile: battery technology, motor driving and control technology, electric vehicle whole technology and energy management technology. Among them, the high-efficiency energy recovery and storage technology is one of the key technologies, and the bidirectional converter is the most important one.
The existing bidirectional Buck-Boost converter technology and products have the problems of large system voltage stress, high power tube heating loss and poor system reliability, so that research and development of a novel bidirectional Buck-Boost converter circuit and a control method thereof are very urgent subjects in the electric automobile industry. The bidirectional direct-current converter can realize direct-current voltage conversion and bidirectional flow of energy, and the bidirectional Buck-Boost converter is the simplest topological structure in the bidirectional direct-current converter and has the advantages of few used power electronic devices, simplicity in driving, high energy conversion efficiency and the like.
Disclosure of Invention
The present invention is directed to a bidirectional Buck-Boost converter circuit and a control method thereof, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a bidirectional Buck-Boost converter circuit comprises a power main circuit consisting of 10 power switch tubes QBo 1-QBo 5 and QBu 1-QBu 5, wherein each power switch tube is provided with a built-in power diode, DBo 1-DBo 5 and DBu 1-DBu 5 respectively, the whole power circuit comprises a power inductor LB, 4 capacitors CBT, co 1-Co 3 and a digital control system, the digital control system comprises a PWM signal isolation amplification module, a synchronous stacking control algorithm module and a MIMO filter module, output control signals sQBo 1-sQBo 5 and sQBu 1-sQBu 5 of the digital control system are respectively connected to the control ends of 10 power switch tubes QBo 1-QBo 5 and QBu 1-QBu 5 through control buses, a terminal voltage signal UCBT of the capacitor CBT is electrically connected to a first input end of the digital control system, a current signal ILB of the inductor LB is electrically connected to a second input end of the digital control system, the voltage signals at the ends of the capacitors Co1 to Co3 are respectively and electrically connected to a third input end of a digital control system, corresponding voltage signals UCo1, UCo2 and UCo3 are respectively input into the digital control system, the high-voltage side current IDC is electrically connected to a fourth input end of the digital control system, 6 signals including the voltage signal at the end of the capacitor CBT, the current signal ILB of the inductor LB, the voltage signals UCo1, UCo2 and UCo3 at the ends of the capacitors Co1 to Co3 and the high-voltage side current IDC are electrically connected to the input end of an MIMO filter module in the digital control system, the 6 filtered signals are output to the input end of a synchronous stacking control algorithm module after being processed by the MIMO filter module, the output of the synchronous stacking control algorithm module is connected to the input end of a PWM signal isolation amplification module, and the control signal output of the PWM signal isolation amplification module is connected to a control bus.
As a still further scheme of the invention: the control method of the bidirectional Buck-Boost converter circuit comprises the following steps: step 1: the MIMO filtering module filters the acquired 6 signal data, the filtering framework is a multi-input multi-output structure, namely 6 paths of input and 6 paths of output, and the filtering process is as follows:
the signals are first constructed into a matrix of digital signals, setting the window width of the digital signal to be n to enable
U CBT ＝X *1 ，I LB ＝X *2 ，U Co1 ＝X *3 ，U Co2 ＝X *4 ，U Co3 ＝X *5 ，I DC ＝X *6 Wherein "#" denotes the index coefficient of a digital signal
Then calculating the average value of each path of signal in the 6 paths of signals to obtain
Then, the variance of each signal in the 6 signals is calculated
Then, the covariance between each two paths of signals in the 6 paths of signals is calculated to obtain
By using s jk The value of the data sequence is subjected to abnormal value detection and updating, a threshold value is set, and filtered 6 signal data can be obtained after updating, so that MIMO filtering is realized;
and 2, step: sending the filtered 6 signal data obtained in the step (1) into a synchronous stacking control algorithm module, and synchronously controlling all power switching tubes in a synchronous stacking control algorithm to generate synchronous stacking control logic;
and 3, step 3: according to the synchronous stacking control algorithm flow, the synchronous stacking process and the reverse synchronous stacking process are sequentially executed, a control period can be obtained, control information generated by the synchronous stacking control algorithm module is input to the PWM signal isolation and amplification module for power amplification and then is directly connected to the control end of each power switch tube through the control bus, and the control of the whole circuit is realized;
and 4, step 4: and (5) repeatedly executing the step 1 to the step 3.
Compared with the prior art, the invention has the beneficial effects that: according to the control method, due to the adoption of the synchronous stack control technology and the circuit structure, the voltage stress of the high-voltage-end capacitor is greatly reduced, and the service life of the capacitor is prolonged; according to the circuit structure and the control method, the diodes which work in an isolated mode do not exist, each diode is a built-in diode of an MOS (metal oxide semiconductor) tube, the actual effect is only to protect the circuit, a main high-current loop does not depend on diode transmission, switching noise and power loss caused by diode voltage drop are eliminated, and the energy recovery efficiency of a system is improved; by adopting a synchronous stacking structure, voltage ripples of a system are reduced, and conducted interference of switching noise is reduced, so that the measurement precision is improved; the voltage stress of all power switching devices is far smaller than that of the high-voltage end, and the system has higher stability and reliability.
Drawings
Fig. 1 is a schematic diagram of a bidirectional Buck-Boost converter circuit.
FIG. 2 is a schematic diagram of the forward synchronous stacking process of the present invention.
FIG. 3 is a schematic diagram of the reverse synchronous stacking process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, in an embodiment of the present invention, a bidirectional Buck-Boost converter circuit includes a power main circuit composed of 10 power switch tubes QBo1 to QBo5, QBu1 to QBu5, each power switch tube has a built-in power diode, and is respectively DBo1 to DBo5, DBu1 to DBu5, and the whole power circuit includes a power inductor LB, 4 capacitors CBT, co1 to Co3, and a digital control system, the digital control system includes a PWM signal isolation amplification module, a synchronous stack control algorithm module, and a MIMO filter module, output control signals sbco 1 to sbco 5, and sbu 1 to sbu 5 of the digital control system are respectively connected to control terminals of the QBo1 to QBo5, QBu1 to QBu5, and 10 power switch tubes in total through a control bus, a voltage signal UCBT is electrically connected to a first input terminal of the digital control system, a current signal qbb of the capacitor CBT is electrically connected to a second input terminal of the digital control system, a voltage signal Co1 to QBu3 of the capacitor, a terminal voltage signal UCBT is electrically connected to a first input terminal of the digital control system, a fourth input terminal voltage control module of the digital control system, a corresponding to a corresponding input terminal voltage control module of the IDC 2 of the dc signal processing system, a corresponding to the dc signal UCo3, a corresponding input terminal voltage control module of the dc signal ucco 3, a corresponding to the dc signal input terminal of the digital control module, and a digital control module of the digital control system, and a corresponding to the dc signal IDC control module of the dc signal processing system, a corresponding to the dc control module.
The PWM signal isolation amplifying module preferably selects a special optical coupling device driven by power, the synchronous stacking control algorithm module and the MIMO filtering module are arranged in a program in an embedded processor, and the embedded processor can be a DSP processor, an FPGA or an ARM processor.
The control method of the bidirectional Buck-Boost converter circuit comprises the following steps: step 1: the MIMO filtering module filters the acquired 6 signal data, the filtering framework is multi-input multi-output, namely 6 paths of input and 6 paths of output, and the filtering process is as follows:
the signal is first constructed into a digital signalNumber matrix, setting window width of digital signal as n, making U CBT ＝X *1 ，I LB ＝X *2 ，U Co1 ＝X *3 ，U Co2 ＝X *4 ，U Co3 ＝X *5 ，I DC ＝X *6 Wherein the ". Sup." denotes index coefficient of the digital signal
Then calculating the average value of each path of signal in the 6 paths of signals to obtain
Then, the variance of each signal in the 6 signals is calculated
Then, the covariance between each two paths of signals in the 6 paths of signals is calculated to obtain
By using s jk The abnormal value detection and updating are carried out on the data sequence by the value of (A), a threshold value is set, and the method is as the following formula
and 2, step: sending the filtered 6 signal data obtained in the step (1) into a synchronous stacking control algorithm module, and synchronously controlling all power switching tubes in a synchronous stacking control algorithm to generate synchronous stacking control logic;
and 3, step 3: according to the synchronous stacking control algorithm flow, the synchronous stacking process and the reverse synchronous stacking process are sequentially executed, a control period can be obtained, control information generated by the synchronous stacking control algorithm module is input to the PWM signal isolation and amplification module for power amplification and then is directly connected to the control end of each power switch tube through a control bus, and the control of the whole circuit is realized;
and 4, step 4: and (5) repeatedly executing the step 1 to the step 3.
For the control method, the specific embodiment of the MIMO filtering module is as follows:
in one embodiment, the signal is first constructed into a digital signal matrix, the window width of the digital signal is set to 64, let U CBT ＝，I LB ＝，U Co1 ＝，U Co2 ＝，U Co3 ＝，I DC =, wherein the symbol indicates the index coefficient of the digital signal
Then, calculating the mean value of each path of signal in the 6 paths of signals to obtain
Then, the variance of each signal in the 6 signals is calculated
Then, the covariance between each two paths of signals in the 6 paths of signals is calculated to obtain
Under the same physical condition (the same power supply, the same control system and other basically consistent working environments) of the bidirectional Buck-Boost converter circuit system, under a steady state, multiple paths of signals have strong correlation, and when the influence of external strong noise interference is received, the noncorrelation characteristic can occur, so that the s-Boost converter circuit system is adopted jk The value of (3) is used for detecting and updating abnormal values of the data sequence, a threshold =0.5 is set, and then the updating method is the following formula
6 filtered signal data can be obtained after updating, and MIMO filtering is realized.
For the control method, the specific embodiment of the synchronous stack control algorithm is as follows:
(1) In the forward synchronous stacking process, the working processes are arranged in sequence, and the states of the working circuits are drawn as shown in fig. 2, wherein the working circuits are represented by thick lines, the non-working circuits are represented by thin lines, and the same is applied below.
The specific working circuit of fig. 2 (a) in this embodiment is: UBT- > LB- > QBu1 (DBu 1) - > QBu2 (DBu 2) - > QBu4- > Co2- > Co1- > UBT and CBT- > QCo 1- > QCo 4 (DBo 4) - > Co2- > Co1- > CBT and Co1- > Co2- > Co3, 3 loops are activated.
The specific working circuit of fig. 2 (b) is: UBT- > LB- > QBu1 (DBu 1) - > QBu5- > Co1- > UBT and CBT- > LB- > QCo 1- > QCo 2- > QCo 5 (DBo 5) - > Co1- > CBT and Co1- > Co2- > Co3, and 3 loops are activated.
The specific workflow of fig. 2 (c) is: UBT- > LB- > QCo 1- > QCo 2- > QCo 3- > Co1- > Co2- > Co3 and UBT- > CBT- > UBT, and 2 loops are activated.
(2) In the reverse synchronous stacking process, see fig. 3.
The specific workflow of fig. 3 (a) in this embodiment is as follows: UBT- > LB- > QBu1 (DBu 1) - > QBu5- > Co1- > UBT and CBT- > LB- > QCo 1- > QCo 2- > QCo 5 (DBo 5) - > Co1- > CBT and Co1- > Co2- > Co3, 3 loops are activated,
the specific workflow of fig. 3 (b) is: UBT- > LB- > QBu1 (DBu 1) - > QBu2 (DBu 2) - > QBu4- > Co2- > Co1- > UBT and CBT- > LB- > QCo 1- > QCo 4 (DBo 4) - > Co2- > Co1- > CBT and Co1- > Co2- > Co3, 3 loops are activated,
the specific workflow of fig. 3 (c) is: UBT- > LB- > QBu1 (DBu 1) - > QBu2 (DBu 2) - > QBu3 (DBu 3) - > Co3- > Co2- > Co1- > UBT and UBT- > CBT- > UBT, for a total of 2 loops activated.
The above two processes of the forward synchronous stacking and the reverse synchronous stacking are sequentially and repeatedly executed, when the processes are executed circularly according to fig. 2 (a) - > fig. 2 (b) - > fig. 2 (c) - > fig. 3 (a) - > fig. 3 (b) - > fig. 3 (c) - > fig. 2 (a), the energy transmission direction is from left to right; when the process is executed circularly according to fig. 3 (c) - > fig. 3 (b) - > fig. 3 (a) - > fig. 2 (c) - > fig. 2 (b) - > fig. 2 (a) - > fig. 3 (c), the energy transmission direction is from left to right, and the bidirectional conversion of energy is realized.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (2)
1. A bidirectional Buck-Boost converter circuit is characterized by comprising a power main circuit consisting of 10 power switch tubes QCo 1-QCo 5 and QBu 1-QBu 5, wherein each power switch tube is provided with a built-in power diode which is respectively DBo 1-DBo 5 and DBu 1-DBu 5, the whole power circuit comprises a power inductor LB, 4 capacitors CBT and Co 1-Co 3 and a digital control system, the digital control system comprises a PWM signal isolation amplification module, a synchronous stack control algorithm module and an MIMO filter module, output control signals sQCo 1-sQCo 5 and sQBu 1-sQBu 5 of the digital control system are respectively connected to control ends of 10 power switch tubes QCo 1-QBu 5 and QBu 1-QBu 5 through control buses, a terminal voltage signal UCBT of the capacitor T is electrically connected to a first input end of the digital control system, a current signal ILB of the inductor LB is electrically connected to a second input end of the digital control system, the voltage signals at the ends of the capacitors Co1 to Co3 are respectively and electrically connected to a third input end of a digital control system, corresponding voltage signals UCo1, UCo2 and UCo3 are respectively input into the digital control system, the high-voltage side current IDC is electrically connected to a fourth input end of the digital control system, in the digital control system, 6 signals including a capacitor CBT terminal voltage signal UCBT, a current signal ILB of an inductor LB, voltage signals UCo1, UCo2 and UCo3 at the ends of the capacitors Co1 to Co3 and high-voltage side current IDC are electrically connected to the input end of an MIMO filtering module, the 6 filtered signals are output to the input end of a synchronous stacking control algorithm module after being processed by the MIMO filtering module, the output of the synchronous stacking control algorithm module is connected to the input end of a PWM signal isolation amplification module, and the control signal output of the PWM signal isolation amplification module is connected to a control bus.
2. The control method of the bidirectional Buck-Boost converter circuit according to claim 1, characterized by comprising the steps of: step 1: the MIMO filtering module filters the acquired 6 signal data, the filtering framework is multi-input multi-output, namely 6 paths of input and 6 paths of output, and the filtering process is as follows:
firstly, constructing the signal into a digital signal matrix, setting the window width of the digital signal as n, and making U CBT ＝X *1 ，I LB ＝X *2 ，U Co1 ＝X *3 ，U Co2 ＝X *4 ，U Co3 ＝X *5 ，I DC ＝X *6 Wherein the ". Sup." denotes index coefficient of the digital signal
Then calculating the average value of each path of signal in the 6 paths of signals to obtain
Then, the variance of each signal in the 6 signals is calculated
Then, the covariance between each two paths of signals in the 6 paths of signals is calculated to obtain
By using s jk The abnormal value detection and updating are carried out on the data sequence by the value of (A), a threshold value is set, and the method is as the following formula
step 2: sending the filtered 6 signal data obtained in the step (1) into a synchronous stacking control algorithm module, and synchronously controlling all power switching tubes in a synchronous stacking control algorithm to generate synchronous stacking control logic, wherein the method is to divide the whole control process into a forward synchronous stacking process and a reverse synchronous stacking process;
and step 3: according to the synchronous stacking control algorithm flow, the synchronous stacking process and the reverse synchronous stacking process are sequentially executed, a control period can be obtained, control information generated by the synchronous stacking control algorithm module is input to the PWM signal isolation and amplification module for power amplification and then is directly connected to the control end of each power switch tube through the control bus, and the control of the whole circuit is realized;
and 4, step 4: and (5) repeatedly executing the step 1 to the step 3.
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| CN102136797A (en) * | 2010-09-08 | 2011-07-27 | 上海岩芯电子科技有限公司 | Modulating method for noninverting Buck-Boost power inverter |
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Effective date of registration: 20190125 Address after: Room 330, Building A, Baiwang Building, No. 1 South Xili Songbai Road, Nanshan District, Shenzhen City, Guangdong Province, 518000 Applicant after: SHENZHEN QUNZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 518000 6, 5 Nangang Second Industrial Park, 1026 West Li Song Bai Road, Nanshan District, Shenzhen, Guangdong. Applicant before: SHENZHEN PARWA TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20190319 Address after: 518000 Guangdong, Shenzhen, Nanshan District Xili street, Shahe West Road, Bai Mong village, South 1, A 330, Bai Wang mansion. Applicant after: Shenzhen Huayuan Technology Industry Co.,Ltd. Address before: Room 330, Building A, Baiwang Building, No. 1 South Xili Songbai Road, Nanshan District, Shenzhen City, Guangdong Province, 518000 Applicant before: SHENZHEN QUNZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. |
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