CN104113145B - Receiving device and method for simultaneously performing radio frequency energy extraction and data communication - Google Patents
Receiving device and method for simultaneously performing radio frequency energy extraction and data communication Download PDFInfo
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- CN104113145B CN104113145B CN201410356181.1A CN201410356181A CN104113145B CN 104113145 B CN104113145 B CN 104113145B CN 201410356181 A CN201410356181 A CN 201410356181A CN 104113145 B CN104113145 B CN 104113145B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
The invention provides a receiving device and a method for simultaneously performing radio frequency energy extraction and data communication. The receiving device comprises a receiving port, an energy extraction circuit and a power management unit, wherein the receiving port is used for receiving radio frequency signals coming from the outside; the energy extraction circuit is connected to the receiving port and used for extracting power signals and data signals out of the radio frequency signals, outputting the power signals to a power management unit and outputting the data signals to a communication unit; and the power management unit is connected with the energy extraction circuit and used for receiving the power signals and storing energy extracted by the energy extraction circuit. According to the technical scheme, wireless energy collection and data communication can be performed simultaneously, and accordingly a mobile device or a handheld device can provide electric energy for itself while performing data communication.
Description
Technical field
The present invention relates to communication technical field, carry out radio frequency energy in particular to a kind of reception device and one kind simultaneously
The method that amount extracts data communication.
Background technology
Three unique systemic-functions are made to become possibility based on the wireless technology of radio frequency, i.e. radio communication (data/language
Sound), wireless sensing (parameter) and wireless power (energy).The first two wireless application present life in all visible they
Figure, and changed our daily life.3rd wireless application wireless energy transfer or transmission (wpt) are in the public
Rarely known by the people, not yet obtain good development and application so far.Strictly speaking, any nature in space or artificial electromagnetism
Radiation and transmission should be referred to as wpt, but we generally refer in particular to " towards electric power " with wpt, well below in infrared ray and light
Energy transmission on wireless frequency in frequency range.
Through the development of nearly more than 20 years, high-density power device, low power consumption integrated circuit, high efficiency RECTIFYING ANTENNA and innovation
Circuit structure promote various wireless energy transmission technologies progress.Additionally, emerging application and market are promoting and " are pushing away
Enter " role of key is played on wpt, such as implant the cmos device exempting from energy content of battery collection system in biomedical engineering
Part, the non-contact type wireless RF identification (rfid) in security application and communications and transportation, and electric automobile and mobile device
Long-range charging and power supply.
The feature of mobile device and hand held system is power consumption and voltage driving is more and more lower, and this has benefited from less honeycomb
The developing rapidly of structure and advanced cmos technology, with the fast development of mobile device and hand held system, it makes this
In a little equipment collection surrounding environment, the electromagnetic energy from broadcast service and radio communication is powered to these equipment becomes possibility.
Therefore, in terms of wireless energy transfer and collection, develop a kind of separate transceivers to realize transmission and the reception of data and energy,
To be research and the application focus of wireless system of future generation.
Content of the invention
The present invention is based on the problems referred to above it is proposed that a kind of carry out the skill that RF energy extracts data communication simultaneously
Art, can be using receiver module wirelessly receiving data and energy simultaneously.
In view of this, according to an aspect of the invention, it is provided a kind of reception device, comprising: receiving port, it is used for connecing
Receive from outside radiofrequency signal；Energy extraction circuit, connects to described receiving port, for extracting from described radiofrequency signal
Go out power signal data signal, described power signal is exported to power management block, and described data-signal is exported
Enter row data communication to communication unit；Described power management block, connects to described Energy extraction circuit, for receiving described work(
Rate signal, stores the energy of described Energy extraction circuit extraction.
Increase Energy extraction circuit in the output of receiving port, from the radiofrequency signal receiving, extract power signal
Data signal (data-signal can be intermediate-freuqncy signal or low frequency signal), this power signal is used for radio frequency power harvesting, data
Signal is used for data communication.Accordingly, it is capable to amount extracts circuit extracts dc power from the radio-frequency carrier receiving, and from identical
Obtain in radio-frequency carrier supporting the power required for data communication it is achieved that carrying out the receipts of wireless energy while data communication
Collection.
It is preferred that described Energy extraction circuit includes rectification circuit in technique scheme, for believing to described radio frequency
Number carry out rectification process, obtain described power signal data signal.
It is preferred that described receiving port includes n output port in any of the above-described technical scheme, described n be more than etc.
In 2 integer；Described rectification circuit includes n rectifier, and described n rectifier is corresponded even with described n output port
Connect.
The receiving port of any structure all can be hereby incorporated by, up to the present the output port quantity of receiving port have 2,
4th, 8 and combinations thereof species.It should be understood that odd number multiport receiver is also possible.Because receiving port has multiple output ends
Mouthful, therefore each output port can connect a rectifier (i.e. power detector), for the radio frequency that output port is exported
Signal carries out rectification process and power reads, and power signal is separated from intermediate frequency or low-frequency data signal, for
Power scavenging.
It is preferred that each rectifier includes in any of the above-described technical scheme: the rectification list being made up of multiple diodes
Unit, described radiofrequency signal is converted into described power signal data signal；Filter circuit, receives from described rectification unit
Output signal, filters out described data-signal from described output signal, and residual signal is described power signal.
The output signal of rectification unit after filtering after the filtration of circuit it is allowed to data-signal and commutating DC signal point
From direct current signal (i.e. power signal) is imported in power scavenger (i.e. power management block).
It is preferred that described rectifier also includes low pass filter or bandpass filter in any of the above-described technical scheme, even
It is connected between described rectification unit and described receiving port, filtration treatment is carried out to described radiofrequency signal, and will be at filtration
The radiofrequency signal of reason exports to described rectification unit.
It is preferred that described rectifier also includes impedance matching network in any of the above-described technical scheme, it is connected to described low
Between bandpass filter or bandpass filter and described rectification unit.
It is preferred that described filter circuit is the topological structure of electric capacity and/or inductance in any of the above-described technical scheme.
It is preferred that the topological structure of described rectification unit is one of following structure in any of the above-described technical scheme:
The cascaded structure of multiple diodes, the parallel-connection structure of multiple diode, voltage multiplication formula structure, bridge architecture.
It is preferred that being composed in series by multiple diodes or in parallel in described rectification unit in any of the above-described technical scheme
During composition, each diode is also associated with resistance, to protect respective diode.In order that diode is from the damage of static discharge
Bad, protection diode is come using the path with high value resistor.
It is preferred that described power management block includes in any of the above-described technical scheme: battery and/or super capacitor；Electricity
Pressure converter, connects to described battery and/or super capacitor, for described power signal is carried out voltage conversion, and will be through electricity
Power signal after pressure conversion exports to described battery and/or super capacitor, to fill to described battery and/or super capacitor
Electricity.To guarantee to provide a constant DC voltage supply.Can use a kind of low leakage capacitance as depositing in power management block
Storage part, and with a DC-to-dc converter, the level of low-voltage is drawn high.According to a further aspect in the invention, also provide
One kind carries out RF energy simultaneously and extracts data communication means, comprising: receive from outside radiofrequency signal；Penetrate from described
Power signal data signal is extracted in frequency signal；Described power signal is exported to power management block, to carry out energy
Storage, and described data-signal is exported to communication unit, to enter row data communication.
It is preferred that rectification process is carried out to described radiofrequency signal using rectification circuit in technique scheme, obtain institute
State power signal and described data-signal.
Increase Energy extraction circuit in the output of receiving port, from the radiofrequency signal receiving, extract power signal
Data signal, this power signal is used for radio frequency power harvesting, and data-signal is used for data communication.Accordingly, it is capable to amount extracts circuit
Extract dc power from the radio-frequency carrier receiving, and obtain supporting required for data communication from identical radio-frequency carrier
Power is it is achieved that carry out the collection of wireless energy while data communication.
Brief description
Fig. 1 shows the schematic diagram of six ports (one of the conventional multiport) receiver in correlation technique；
Fig. 2 shows the Basic architecture figure of reception device according to an embodiment of the invention；
Fig. 3 shows the schematic diagram of reception device according to an embodiment of the invention；
Fig. 4 carries out the processing stream of collection of energy data communication while showing corresponding to reception device shown in Fig. 3
Journey schematic diagram；
Fig. 5 shows the schematic diagram of the rectification circuit in reception device shown in Fig. 3；
Fig. 6 shows the schematic diagram of reception device according to another embodiment of the present invention；
Fig. 7 shows output dc power that this rectifier obtained with respect to the emulation of input power and measurement result；
Fig. 8 shows rf-dc (radio frequency-direct current) conversion efficiency with respect to the emulation of input power and measurement result；
Fig. 9 shows the flow process simultaneously carrying out that RF energy extracts data communication means according to an embodiment of the invention
Figure.
Specific embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specifically real
Mode of applying is further described in detail to the present invention.It should be noted that in the case of not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Elaborate a lot of details in the following description in order to fully understand the present invention, but, the present invention also may be used
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not described below
Specific embodiment restriction.
The basic functional principle of n end receiver and essential characteristic described in a lot of public publications, for convenience
Understand the operation principle of the reception device according to the present invention, below, simple declaration six port receives taking six end receivers as a example
The basic functional principle of machine although hereinafter taking six end receivers as a example, it should be understood that n end receiver all can be combined in
This is realizing the reception device according to the present invention.
Fig. 1 shows the schematic diagram of six end receivers in correlation technique.
As shown in figure 1, depicting the structure of six port receiver, in general, the structure master of six port receiver
Including two parts, i.e. AFE(analog front end) 102 and digital front-end 104.AFE(analog front end) 102 is connected to power detector net by one
Six ports 1022 of network are formed.Six ports 1022 are linear units, including two inputs (radio frequency (rf) letter receiving
Number with local oscillator (lo) signal) with four outputs (by rf with lo signal with certain phase relation form four kinds different
Combination output).The power signal recording is input to analog-digital converter (adc) by analog signal, to convert analog signals into
Data signal, by the data input after conversion to communications portion (such as fpga).Digital front-end 104 includes analog-digital converter and leads to
Letter part.It should be understood that under some actual conditions, adc may be included in fpga module.Fpga circuit board comprises necessity
Digital signal processor, this be calculate complex baseband signal required for.
Based on the research and development of former multiterminal vocal imitation skill, the Basic architecture of the reception device according to the present invention can
Referring to Fig. 2, power harvester 2042 can extract the RF energy of radiofrequency signal, and data transmission unit 2044 completes data and leads to
Letter, carries out Energy extraction data transmission simultaneously.In such a configuration, achievable data message and connecing while dc power
Receive, data message can extract from modulation carrier signal, and dc power can obtain from radio-frequency carrier component.
Synchronous energy collects one kind that data communication is follow-on self-powered or energy mix and communication system to be had very much
The method of prospect.In general, structure is simple, low-power consumption, small volume, low cost and be all emerging wireless receiving and dispatching at high speed
Necessary to device.Receive and dispatch scheme compared to heterodyne system, application in transceiver design for the multiterminal vocal imitation skill has shown that significantly
Advantage.Because the power of multiport homodyne technique reads simply, rather than the frequency mixer using high-power driving, therefore multiport zero
Difference technology is very noticeable always.Therefore, based on the receiver of six ports be to existing receive topological structure favourable optimization.Remove
Outside i the and q component of rectified signal, (dc) direct current signal can be obtained from the output end of six end receivers.This
DC component can be recycled or be used for system power supply in addition to the battery.This will mitigate the burden of battery or extend battery
Service life.Therefore, the receiver of synchrodata and energy can be implemented, and this scheme is pneumatic/electric similar to mixing
Motor-car, the motion of this vehicle can produce electric power and be used further to the power supply of vehicle itself.
In order to realize one kind, there is bifunctional data and power reception system, the power detection of six port receiver simultaneously
Device and filtering part are rectified module and are substituted, and this rectification module has very high radio frequency-direct current conversion efficiency, and also has
Separate the ability of intermediate frequency or low-frequency data signal and DC power signal.Referring to Fig. 3, six ends are based on according to reception device of the present invention
Mouth reception technique, it mainly includes 302,4 Energy extraction circuit 304 of six port joint, a power management block 306
With a communication unit 308, this communication unit 308 includes adc module and fpga module.In figure 3, Energy extraction circuit 304
Correspond to the power harvester 2042 in Fig. 2 with power management block 306, communication unit 308 corresponds to the data transfer in Fig. 2
Unit 2044.Six port 302 receives the radiofrequency signal from outside such as transmitter, and Energy extraction circuit 304 is believed to this radio frequency
Number processed, isolated DC power signal data signal (intermediate frequency or low frequency signal), wherein, DC power signal is defeated
Go out to power management block 306, carry out collection of energy, can power for receiver, realize the self-powered of receiver；Data-signal quilt
Export to communication unit 308, realize data transfer.
In figure 3, due to based on Six-port technique, therefore there being four tunnel outputs, each output connects an energy and carries
Sense circuit 304, to extract the RF energy in each output.
Although it will be understood by those skilled in the art that the reception dress according to the present invention to be herein described with Six-port technique
The embodiment put, it is true that current n port reception technique all can be combined in this, each output connects an Energy extraction
Circuit.
The process chart of the reception device according to the present invention can be found in Fig. 4, Fig. 4 be carry out simultaneously wireless power transfer and
The process chart of data communication.
As shown in figure 4, first, six port joints receive from outside radiofrequency signal 402, and then this radiofrequency signal is defeated
Enter rectification circuit and carry out processing 404, the output of rectification circuit is divided into two parts: is transferred to an optimal ohmic load with reality
The wireless energy of existing power scavenging collects part 406, and is transferred to data communication units to realize the number of data extraction procedure
According to communications portion 408.The extraction of data-signal is to be realized by the coherent combination of these Multi-ported Data signals.Once from
All output ends of six port joints collect dc power or rectified wave, and the DC voltage all collected will be by power management
Unit is adjusted, to guarantee to provide a constant DC voltage supply.Can use a kind of low leakage capacitance as power tube
Memory unit in reason unit, and with a DC-to-dc converter, the level of low-voltage is drawn high.
Understood based on above description, after rf signal is received by reception antenna, by six port joints, in four output ends
With lo signal combination, thus forming four signals of out of phase.They are to be injected into rectification circuit in this four output ends
's.The output signal of this rectification circuit passes through some filter processes, is then transferred into communication unit and is demodulated process data
Extract.This filter process allows the separation of data-signal (base band) and commutating DC.Simplest circuit can be with suitable
Doing, these capacitors can allow base band to pass through to capacitive form, but can stop whole DC components, and DC component can be by again
It is input in power management block.
In the reception device according to the present invention, more important part is Energy extraction circuit, and this Energy extraction circuit can
It is made up of rectification circuit.Further describe the base according to the rectification circuit in the reception device of the present invention with reference to Fig. 5
In composition and basic functional principle.
As shown in figure 5, generally, the rectification circuit being connected with six port joints 502 may include that a low pass filtered
Ripple device or bandpass filter 504 (this wave filter may not be necessary under some application scenarios), using low pass filter or
Bandpass filter, depending on different operating frequencies, suppresses undesired higher hamonic wave by rectifier cell；Impedance matching net
Network 506；Rectifier cell 508, in the present embodiment, this rectifier cell is made up of one or more diodes, concrete topological structure
Certainly in the configuration of reception device structure；One is used for smooth dc voltage output and the filter circuit 510 improving systematic function, right
In the Nonlinear Processing process of rectification, produced higher hamonic wave is decayed；One DC load (or DC-to-dc charges
Module).
It should be noted that, rectification circuit has different topological structures, in the present embodiment, can be according to practical application needs
To select suitable topological structure, such as the cascaded structure of multiple diodes, the parallel-connection structure of multiple diodes, voltage multiplication formula is tied
Structure and bridge architecture.Cascaded structure and parallel-connection structure can reduce diode losses, and can be used as low-power rectifier design
Preferably alternative construction.The rectification circuit of two diode compositions in a voltage multiplication formula structure can be with producing ratio list two
The VD of at least high twice of pole pipe rectifier, the size holding of circuit is constant simultaneously.It should be understood that above-mentioned example is only
It is a kind of example, be not limited to the present invention.For realizing wireless power transmission it is important to realize radio frequency efficiently turning to direct current
Change the rectification circuit of efficiency.There is efficient radio frequency in the rectification circuit of the conversion efficiency of direct current in design, diode is
Important element.The power conversion efficiency of one rectifier mainly to be determined by three parameters of diode, series resistance
(rs) efficiency be directly limit by power loss, zero inclined junction capacity (cj0), have impact on the harmonic wave electricity by Diode oscillation
Flow, and breakdown voltage (vbr) limits the power handling capability (this can use in high-power applications) of rectification circuit.For
Realize rectification it is necessary to select a diode with speed-sensitive switch characteristic, high-frequency input signal to be processed, and
This diode need to have relatively low blanking voltage, to work when rf input power is relatively low.
Next the another embodiment of the reception device according to the present invention is further illustrated with reference to Fig. 6.In the present embodiment,
Rectification circuit includes bandpass filter 504, impedance matching network 506 and rectifier cell, filter circuit 510, wherein rectifier cell
Including two diodes (602 and 604), filter circuit 510 is electric capacity.Rectification circuit can be by direct current component from intermediate frequency or low frequency portion
Separate, that is, the rectified wave from each output port of six ports 504 can collect dc power, and can keep simultaneously
The intermediate frequency of rectified wave output or low frequency (related to base band) part, and send it to decoder execution demodulating process.In harmonic wave
Completed (it should be understood that this dc blocking capacitors can be incorporated in using dc blocking capacitors after rejects trap
In filter).Direct current component collected by rectification circuit provides bucking-out system power loading or charges the battery required
Power.And it is related to the intermediate frequency of whole i and q components of rf signal that receives or low frequency part is then directed to the data of receiver
Processing unit.
As described above, the invention provides a kind of simple rectification topology, this structure can be used on may be self-powered
In transceiver configuration.In the present embodiment, have also been devised two very high paths of the resistance using high value resistor design to protect
Diode, and can when diode is injected into the signal of a HDR so as to damage from static discharge (esd)
Diode is prevented to be burned out.The design of impedance matching network can determine according to the input impedance of diode.
In order to ensure structure proposed by the invention can normal work in microwave and millimeter wave frequency band, rectifier is designed to
It is operated in 24ghz.According to simulation result, the rectifier in the rf input power of 35mw and 610 ω ohmic loads is optimal.
Fig. 7 shows output dc power that this rectifier obtained with respect to the emulation of input power and measurement result, and Fig. 8 shows
Radio frequency-direct current conversion efficiency is with respect to the emulation of input power and measurement result.The model machine made is to mate with 23ghz
, therefore recorded is the efficiency measured in 23ghz, and under this frequency, it shows better performance.Emulation
4% frequency displacement (1ghz) producing in 24ghz and the model machine made between is acceptable.It should be noted that, in milli
Meter wave frequency band, is to have certain difference between the emulation of efficiency and measurement result.This deviation is considered as because rectification two
The effect of the Non-linear Junction Capacitance of pole pipe.When input power is less than 35mw, conversion efficiency is gradually increased, afterwards because diode
Voltage exceed breakdown voltage, conversion efficiency is i.e. rapid to be declined.
Wireless Telecom Equipment, such as mobile phone, panel computer, intelligent watch etc. be can be applicable to according to the reception device of the present invention
Portable mobile apparatus.
As shown in figure 9, carry out RF energy according to an embodiment of the invention to extract data communication means simultaneously, permissible
Comprise the following steps:
Step 902, receives from outside radiofrequency signal；Step 904, extracts power signal sum from radiofrequency signal
It is believed that number；Step 906, power signal is exported to power management block, to carry out energy storage, and data-signal is exported
To communication unit, to enter row data communication.
It is preferred that rectification process is carried out to radiofrequency signal using rectification circuit in technique scheme, obtain power letter
Number and base-band data signal.
Increase Energy extraction circuit in the output of receiving port, from the radiofrequency signal receiving, extract power signal
Data signal, this power signal is used for radio frequency power harvesting, and data-signal is used for data communication.Accordingly, it is capable to amount extracts circuit
Dc power is extracted from the rf carrier wave receiving, and obtains supporting the work(required for data communication from identical rf carrier schemes
Rate is it is achieved that carry out the collection of wireless energy while data communication.
Technology according to the present invention scheme is described in detail above in association with accompanying drawing, the reception device according to the present invention can be same
Shi Jinhang Energy extraction data communicates, so that RF energy can be recycled or be used for system in addition to the battery is supplied
Electricity, this will mitigate the burden of battery or the service life extending battery.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of reception device is it is characterised in that include:
Receiving port, for receiving from outside radiofrequency signal；
Energy extraction circuit, connects to described receiving port, for extracting power signal data from described radiofrequency signal
Signal, described power signal is exported to power management block, and described data-signal is exported enters line number to communication unit
According to communication；Described power management block, connects to described Energy extraction circuit, for receiving described power signal, storage is described
The energy of Energy extraction circuit extraction；
Wherein, described Energy extraction circuit includes rectification circuit, for carrying out rectification process to described radiofrequency signal, obtains described
Power signal data signal；
Described receiving port includes n output port, and described n is the integer more than or equal to 2；
Described rectification circuit includes n rectifier, and described n rectifier is connected one to one with described n output port；
Each rectifier includes:
The rectification unit being made up of multiple diodes, by power rectification by described radiofrequency signal be converted into described power signal with
And described data-signal is obtained by interference technique；
Filter circuit, receives the output signal from described rectification unit, filters out described data letter from described output signal
Number, residual signal is described power signal, and described filter circuit is the topological structure of electric capacity and/or inductance；
The topological structure of described rectification unit is one of following structure:
The cascaded structure of multiple diodes compositions, the parallel-connection structure of multiple diode composition, voltage multiplication formula structure, bridge-type knot
Structure.
2. reception device according to claim 1 is it is characterised in that described rectifier also includes low pass filter or band logical
Wave filter, is connected between described rectification unit and described receiving port, carries out filtration treatment to described radiofrequency signal, and will be through
The radiofrequency signal crossing filtration treatment exports to described rectification unit.
3. reception device according to claim 2, it is characterised in that described rectifier also includes impedance matching network, connects
It is connected between described low pass filter or bandpass filter and described rectification unit.
4. reception device according to claim 1 is it is characterised in that in described rectification unit by multiple Diode series groups
When becoming or composing in parallel, each diode is also associated with resistance, to protect respective diode.
5. reception device according to any one of claim 1 to 4 is it is characterised in that described power management block includes:
Battery or super capacitor；
Electric pressure converter, connects to described battery or super capacitor, for described power signal is carried out voltage conversion, and will be through
Power signal after voltage conversion exports to described battery or super capacitor, to be charged to described battery or super capacitor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356181.1A CN104113145B (en) | 2014-07-24 | 2014-07-24 | Receiving device and method for simultaneously performing radio frequency energy extraction and data communication |
| PCT/CN2014/083838 WO2016011676A1 (en) | 2014-07-24 | 2014-08-06 | Receiving apparatus and method for simultaneously performing radio frequency energy extraction and data communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356181.1A CN104113145B (en) | 2014-07-24 | 2014-07-24 | Receiving device and method for simultaneously performing radio frequency energy extraction and data communication |
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| CN104113145A CN104113145A (en) | 2014-10-22 |
| CN104113145B true CN104113145B (en) | 2017-01-25 |
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2014
- 2014-07-24 CN CN201410356181.1A patent/CN104113145B/en active Active
- 2014-08-06 WO PCT/CN2014/083838 patent/WO2016011676A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| CN104113145A (en) | 2014-10-22 |
| WO2016011676A1 (en) | 2016-01-28 |
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Effective date of registration: 20210407 Address after: 311101 room 570, building 3, No.1 luting Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG ZHEHAI ENTERPRISE MANAGEMENT Co.,Ltd. Address before: Room 1302, 13th floor, No.1 building, Zhejiang overseas high level Talents Innovation Park, no.998, Wenyi West Road, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU KEMAO RUIHAI TECHNOLOGY Co.,Ltd. |