CN208570239U - A kind of solid relay device of low-cost and high-precision - Google Patents
A kind of solid relay device of low-cost and high-precision Download PDFInfo
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- CN208570239U CN208570239U CN201820929031.9U CN201820929031U CN208570239U CN 208570239 U CN208570239 U CN 208570239U CN 201820929031 U CN201820929031 U CN 201820929031U CN 208570239 U CN208570239 U CN 208570239U
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Abstract
The utility model provides a kind of solid relay device of low-cost and high-precision, including MCU, short switch and adjustable resistance module, the output end of the adjustable resistance module is provided with one group of resistance output interface, the short switch is connected in parallel on the outlet side of the adjustable resistance module, and one group of SOUT switch is in series between the short switch and the resistance output interface；The short switch, the adjustable resistance module and SOUT switch are connected with the MCU.Utility model has the advantages that commonplace components can be used to realize in the various devices in the utility model solid relay device, and resistance value can type selecting range it is wide, resistance type selecting is at low cost, while can also be achieved the resistance output of superhigh precision.
Description
Technical field
The utility model relates to electronic technology field, in particular to the solid relay device of a kind of low-cost and high-precision.
Background technique
Currently, requiring using adjustable resistance durings testing temperature, the pressure resistance etc. of circuit as test source.But
There are following defects for existing adjustable resistance:
1, current adjustable resistor (such as TPL501-1000) is usually present 20% trueness error, and precision is too
Low, pressure resistance is also relatively low (general only tens volts), is unable to satisfy current testing requirement at all；
2, Contemporary Digital adjustable resistance uses resistance to connect, therefore when in use, needs using in multiple resistance value
Precision resistance realizes that this causes resistance type selecting difficult, and cost is also relatively high；
3, current solid relay cannot achieve the resistance value output of 0 Ω resistance；
4, current solid relay cannot achieve the resistance value output of infinite resistance；
5, the adjustable resistance module of Most current all only has a kind of communication interface, cannot achieve compatible a variety of circuits, this
It will lead to development cost increase.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of solid relay device of low-cost and high-precision,
The resistance output of superhigh precision can be realized by the solid relay device.
The utility model is realized in this way: a kind of solid relay device of low-cost and high-precision, the number is adjustable
Resistor includes MCU, short switch and adjustable resistance module, and the output end of the adjustable resistance module is provided with one group of resistance
Output interface, the short switch are connected in parallel on the outlet side of the adjustable resistance module, and the short switch and the resistance are defeated
One group of SOUT switch is in series between outgoing interface；The short switch, the adjustable resistance module and SOUT switch are and institute
MCU is stated to be connected.
Further, the adjustable resistance module includes that a plurality of resistance being cascaded and a plurality of first order are opened
It closes to a plurality of N grades and switchs；A first order, which is formed, with a first order switch in parallel per the resistance adjusts unit；
The every A1 continuous first order adjust unit and form adjusting unit in a second level with a second level switch in parallel；
The every A2 continuous second level adjust unit and form third level adjusting unit with a third level switch in parallel；
And so on；
Until every Ai continuous N-1 grades of adjustings units form a N grades of adjustings lists with a N grades of switch in parallel
Member；Wherein, A1 to Ai is the natural number more than or equal to 2；N is the natural number more than or equal to 3；
A plurality of first order, which are switched to a plurality of N grades of switches, to be connected with the MCU.
Further, in concatenated each resistance, the range of choice of first resistance is that entire number is adjustable
Between 0.6 times of the maximum resolution of resistor~0.9 times, and the choosing value range for being located at the resistance of latter one is position
Between 0.6 times~0.9 times of the choosing value range of one resistance in front；The maximum of the solid relay device is differentiated
Rate is the sum of the resistance value of all resistance.
Utility model has the advantages that
1, commonplace components can be used to realize in the various devices in the utility model solid relay device, and resistance value
Can type selecting range it is wide, resistance type selecting is at low cost, at the same can also be achieved superhigh precision resistance output；
2, the utility model solid relay device can realize that 0 Ω resistance exports easily；
3, the utility model solid relay device can realize that infinite resistance exports easily；
4, the switch of the utility model solid relay device and resistance is many kinds of, can easily select very much pressure resistance etc.
The different switch and resistance of grade meets different grades of resistance to pressure request as the device for designing circuit, with this；
5, the utility model solid relay device is controlled using MCU, and MCU can support multiple communication modes,
Therefore it, it can be achieved that compatible a variety of circuits, is not used only more flexible, and helps to reduce development cost.
Detailed description of the invention
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of schematic block circuit diagram of the solid relay device of low-cost and high-precision of the utility model.
Fig. 2 is a kind of control principle block diagram of the solid relay device of low-cost and high-precision of the utility model.
Fig. 3 is the schematic block circuit diagram that the first order adjusts unit in the utility model.
Fig. 4 is the schematic block circuit diagram that the second level adjusts unit in the utility model.
Fig. 5 is the schematic block circuit diagram that the third level adjusts unit in the utility model.
Fig. 6 is the schematic block circuit diagram of N grades of adjusting units in the utility model.
Fig. 7 is a kind of circuit diagram of a specific example of the solid relay device of low-cost and high-precision of the utility model.
Fig. 8 is a kind of execution process of the control method of the solid relay device of low-cost and high-precision of the utility model
Figure.
Specific embodiment
Please emphasis referring to figs. 1 to shown in Fig. 8, a kind of solid relay device of low-cost and high-precision of the utility model compared with
Good embodiment, the solid relay device include MCU, short switch and adjustable resistance module, the adjustable resistance module
Output end be provided with one group of resistance output interface；The short switch is connected in parallel on the outlet side of the adjustable resistance module, institute
It states and is in series with one group of SOUT switch between short switch and the resistance output interface；The short switch, the adjustable resistance
Module and SOUT switch are connected with the MCU.
In the specific implementation, entire solid relay device is controlled by MCU, due to being using MCU
Circuit mode, therefore can support multiple communication modes (such as SPI, IIC, SMBUS etc.), MCU is by different communication interfaces
It after receiving data, all can uniformly be handled, including go to change resistance variations and other operations.The resistance output interface is used for
Realize the output of resistance value；The short switch is used to evade the impedance loop of entire adjustable resistor, to realize 0 Ω resistance
Output；The SOUT switch disconnects for realizing the circuit of entire adjustable resistor, to realize output infinite resistance value
Effect.
The adjustable resistance module includes that a plurality of resistance (R1~Rn) being cascaded and a plurality of first order are opened
It closes to a plurality of N grades and switchs；A first order is formed with a first order switch in parallel per the resistance adjusts unit (i.e. minimum
Adjustable unit)；In the specific implementation, when needing to use some resistance, just by the first order corresponding to the resistance
Switch is opened；Else if not needing just to close the switch the first order corresponding to the resistance using to some resistance, thus real
The now short circuit operation of the resistance；
The every A1 continuous first order adjust unit and form adjusting unit in a second level with a second level switch in parallel；?
When it is implemented, when a certain A1 continuous first order adjust the first order switch in unit and are in closed state, so that it may
To close the switch the corresponding second level, the first order switch that A1 have been connected is shorted, to reach elimination first
The purpose of the conduction impedance of grade switch；
The every A2 continuous second level adjust unit and form third level adjusting unit with a third level switch in parallel；?
When it is implemented, when a certain A2 continuous second level adjust the second level switch in unit and are in closed state, so that it may
To close the switch the corresponding third level, the second level switch that A2 have been connected is shorted, to reach elimination second
The purpose of the conduction impedance of grade switch；
And so on；
Until every Ai continuous N-1 grades of adjustings units form a N grades of adjustings lists with a N grades of switch in parallel
Member；Wherein, A1 to Ai is the natural number more than or equal to 2；N is the natural number more than or equal to 3；It is being embodied
When, when the N-1 grades of switches that a certain Ai continuous N-1 grades are adjusted in unit are in closed state, so that it may will be right
N grades answered close the switch, and the N-1 grades of switches that Ai have been connected are shorted, to reach N-1 grades of switches of elimination
Conduction impedance purpose；
A plurality of first order, which are switched to a plurality of N grades of switches, to be connected with the MCU, to pass through MCU
It is controlled to switch the first order to a plurality of N grades of switches.
In concatenated each resistance, the range of choice of first resistance be entire solid relay device most
Between 0.6 times~0.9 times of big resolution ratio, and the choosing value range for being located at the resistance of latter one is positioned at front one
0.6 times~0.9 times of choosing value range of the resistance between；The maximum resolution of the solid relay device is all electricity
The sum of resistance value of resistance.Since each resistance can have 20% or so trueness error, by using latter one will be located at
The choosing value range of the resistance be set as between 0.6 times~0.9 times of choosing value range of the resistance of front one,
Trueness error can be reduced well.For example, the maximum resolution of solid relay device is the Europe X, then, the choosing value range of R1 is just
Between 0.6 times~0.9 times of the Europe X, the choosing value range of R2 just between 0.6 times~0.9 times of R1, and so on go down.
The example being embodied below with one is described further come the adjustable resistance module to the utility model:
In the solid relay device of the example, one group of resistance output of the output end including being set to adjustable resistance module
Interface；Short switch M_ss is connected in parallel on the outlet side of adjustable resistance module, goes here and there between short switch M_ss and resistance output interface
Join one group of SOUT switch M_sout；The adjustable resistance module includes resistance R1~R8, first order switch SA1~SA8, the second level
Switch SB1~SB4, third level switch SC1~SC2.Wherein, resistance R1~R8 is cascaded；Resistance R1 and the first order switch
SA1 composes in parallel first first order and adjusts unit, and resistance R2 and first order switch SA2 compose in parallel second first order and adjust
Unit ... resistance R8 and first order switch SA8 composes in parallel the 8th first order and adjusts unit；First first order is adjusted
Unit and second first order adjust unit and first second level switch SB1 composes in parallel first second level and adjust list
Member ... the 7th first order adjusts unit and the 8th first order adjusting unit is in parallel with the 4th second level switch SB4
It forms the 4th second level and adjusts unit；First second level adjusts unit and second second level adjusts unit and first the
Three step switch SC1 composes in parallel first third level and adjusts unit, and the third second level adjusts unit and the 4th second level tune
Section unit and second third level switch SC2 compose in parallel second third level and adjust unit.
When specifically used, control method includes a kind of solid relay device of low-cost and high-precision of the utility model
Following steps:
Step S1, the short switch, SOUT switch, resistance and the first order are switched to N grades of switches and carries out electricity
Resistance value calibration；Resistance value mark is first carried out by switching short switch, SOUT switch, resistance and the first order to N grades of switches
It is fixed, the loading error of system can be reduced well；
Step S2, MCU is loaded from external equipment needs target output value Res to be used；
Step S3, the short switch, SOUT switch and the first order are disconnected to switch to N grades and switch, makes whole system
It is all default by the way of disconnecting all switches in subsequent description in original state；Certainly, it is being embodied
When, it can also be closed using switching the short switch, SOUT switch and the first order to N grades of switches come real
It is existing.
Step S4, minimum resolution output is carried out to target output value Res to determine；
Step S5, maximum resolution output is carried out to target output value Res to determine；
Step S6, the conduction impedance of compensation first order switch；
Step S7, it screens resistance and the second level switchs to N grades and switchs, and final loading error value is returned to outside
Portion's equipment.
Wherein, the step S1 specifically:
The resistance value of each resistance is measured using multimeter, and the resistance value for each resistance measured is transmitted to MCU, by
MCU demarcates the resistance value of each resistance；
The conduction impedance of short switch is checked or measured, and the conduction impedance of short switch is transmitted to MCU, by MCU pairs
The conduction impedance of short switch is demarcated；
The conduction impedance of SOUT switch is checked or measured, and the SOUT conduction impedance switched is transmitted to MCU, by MCU pairs
The conduction impedance of SOUT switch is demarcated；
It checks or measures the first order and switch the conduction impedance switched to N grades, and the first order is switched to N grades and is switched
Conduction impedance be transmitted to MCU, by MCU to the first order switch to N grades switch conduction impedance demarcate.
Above-mentioned short switch, SOUT switch, resistance and the first order are switched to N grade switches after demarcating, when
When needing using corresponding resistance value or conduction impedance is arrived, so that it may directly be obtained from MCU.
The step S4 is specifically included:
Step S41, judge whether target output value Res is less than minimum resolution Res_min, the minimum resolution Res_
Min is the sum of the conduction impedance of the resistance value of minimum resistance or two SOUT switch in the adjustable resistor, if so, holding
Row step S42；If it is not, thening follow the steps S5；
Step S42, it controls short switch and two SOUT is closed the switch；Target output value Res is first subtracted into short switch
Conduction impedance, then subtract the sum of the conduction impedance of two SOUT switch and obtain loading error value, and return loading error value to
External equipment.
For example, the target output value Res of MCU load is 3 Ω, the resistance value of the smallest resistance is 2 Ω, two SOUT switches
The sum of conduction impedance be 1.6 Ω.It is short therefore, it is necessary to control since target output value Res is smaller than minimum resolution Res_min
Way switch and two SOUT are closed the switch, and return to loading error value=3 Ω -2 Ω -1.6 Ω=- 0.6 Ω to external equipment.
The step S5 is specifically included:
Step S51, judge whether target output value Res is greater than maximum resolution Res_max, and the maximum less than twice point
Resolution Res_max, the maximum resolution Res_max is the sum of the resistance value of all resistance, if it is, entering step S52；
If not, thening follow the steps S53；
Step S52, two SOUT are controlled to close the switch, maximum resolution Res_max is subtracted into target output value Res and is obtained
Loading error value, and loading error value is returned to external equipment；
Step S53, judge whether target output value Res is more than or equal to twice of maximum resolution Res_max, if so,
It then controls two SOUT switches to disconnect, target output value Res is loading error value at this time, and exports the resistance of approximate infinity
To external equipment；If not, thening follow the steps S6.
For example, the target output value Res of MCU load is 3M Ω, maximum resolution Res_max is 2M Ω.Since target is defeated
Value Res is greater than maximum resolution Res_max, and the maximum resolution Res_max less than twice out, and therefore, it is necessary to control two
SOUT is closed the switch, and returns to loading error value=3M Ω -2M Ω=1M Ω to external equipment.If the mesh of MCU load at this time
Mark output valve Res is 5M Ω, since target output value Res is greater than twice of maximum resolution Res_max, it is therefore desirable to control two
A SOUT switch disconnects, and makes the approximate infinitely great resistance value of system output.
The step S6 specifically:
The conduction impedance of each first order switch of calibration is obtained, and the conduction impedance that each first order switchs is added
Into target output value Res, i.e., the conduction impedance that each first order switchs uniformly is charged first in target output value Res, mesh
Be compensation each first order switch conduction impedance, to improve the loading accuracy of solid relay device.
The step S7 is specifically included:
Step S71, do you judge that m is less than n? if so, thening follow the steps S72；If it is not, then the complete target of non-operation is exported
Value Res returns to external equipment as final loading error value；Wherein, n indicates the number of resistance, and m expression loops to determine
Number, and the initial value of m is 1；
Step S72, participation judgement is carried out to m-th of resistance, i.e., has been selected from n resistance according to target output value Res
Participate in the resistance adjusted；
Step S73, the conduction impedance of all first order switch in single second level switch is handled；Handle the single third level
The conduction impedance of all second level switch in switch；And so on；
Until having handled the conduction impedance of all N-1 grades of switches in single N grades of switches；
Step S74, m=m+1 is enabled, and executes step S71.
The step S72 specifically:
Target output value Res is compared with the resistance value of m-th of resistance (for example, being needed when compare for the first time
Target output value Res is compared with the resistance value of first resistance), and if target output value Res is more than or equal to m
The resistance value of a resistance then illustrates that m-th of resistance needs to participate in resistance adjustment, at this point, disconnecting the with m-th of resistor coupled in parallel
M-th of resistance string entry loop is participated in adjusting by level-one switch, and marking first order switch is off-state, meanwhile, it will
Target output value Res first subtracts the resistance value of m-th of resistance, then subtract corresponding first order switch conduction impedance obtain it is new
Target output value Res, enters step S73 later；Wherein, subtract m-th of resistance resistance value be in order to will participate in adjust electricity
Resistance is deducted, and subtracting the conduction impedance that the corresponding first order switchs is the loading accuracy in order to improve system.
Otherwise, if target output value Res illustrates that m-th of resistance needs not participate in less than the resistance value of m-th of resistance
M-th of the resistance is shorted, and mark by resistance adjustment at this point, closure and the first order of m-th of resistor coupled in parallel switch
Remember that first order switch is closed state, enters step S73 later.
The step S73 is specifically included:
Step S731, judge whether A1 can be divided exactly by m, A1 indicates the first order switch for being included in each second level switch
Number, if A1 can be divided exactly by m (for example, the value that A1 value is 2, m is 6), then to switch and wrapped to the m/A1 second level
The state of the first order switch contained is judged, and if it is to close that the m/A1 second level, which switchs included first order switch,
Conjunction state (state of first order switch is labeled in step S72), then closed the switch the m/A1 second level, come with this
It eliminates the m/A1 second level and switchs the conduction impedance of included first order switch, and mark the m/A1 second level switch
For closed state, meanwhile, target output value Res is first subtracted into each first order that the m/A1 second level switch is included and is switched
The sum of conduction impedance enters later along with the conduction impedance of the m/A1 second level switch obtains new target output value Res
Step S732；If the m/A1 second level switchs included first order switch and is not all closed state, by m/A1
Second level switch disconnects, and marking the m/A1 second level switch is off-state, enters step S732 later；If A1 is not
It can be divided exactly by m, then enter step S732；
Step S732, judge whether A2 can be divided exactly by m/A1, A2 indicates the second level for being included in each third level switch
The number of switch, if A2 can be divided exactly by m/A1 (for example, the value that the value of A1 is 3, A2 be 2, m value be 12), then it is right
The state that a third level of m/ (A1*A2) switchs included second level switch judged, and if m/ (A1*A2) a the
The second level switch that three step switch is included is closed state, then closes the switch m/ (A1*A2) a third level, come with this
It eliminates a third level of m/ (A1*A2) and switchs the conduction impedance of included second level switch, and mark the m/ (A1*A2) a
Third level switch is closed state, meanwhile, target output value Res, which is first subtracted a third level switch of m/ (A1*A2), is included
Each second level switch the sum of conduction impedance, along with the conduction impedance of m/ (A1*A2) a third level switch obtain it is new
Target output value Res, enters step S733 later；If a third level of m/ (A1*A2) switchs included second level switch
It is not all closed state, then is disconnected a third level switch of m/ (A1*A2), and m/ (A1*A2) a third level is marked to open
Closing is off-state, enters step S733 later；If A2 cannot be divided exactly by m/A1, S733 is entered step；
And so on；
Up to step S73i, judge whether Ai can be divided exactly by m/ (A1*A2...*A (i-1)), Ai indicates each N grades and opens
The number for N-1 grades of switches for being included inside the Pass, if Ai can be divided exactly by m/ (A1*A2...*A (i-1)), to m/ (A1*
A2...*Ai) state of N-1 grades of included switches of a N grades of switches is judged, and if m/ (A1*A2...*Ai)
N-1 grades of included switches of a N grades of switches are closed state, then close a N grades of switches of m/ (A1*A2...*Ai)
It closes, the conduction impedance of N-1 grades of included switches of a N grades of switches of m/ (A1*A2...*Ai) is eliminated with this, and mark
A N grades of switches of the m/ (A1*A2...*Ai) are closed state, meanwhile, target output value Res is first subtracted into m/ (A1*
A2...*Ai it) switchs the sum of the conduction impedance that each N-1 grades for being included switch for a N grades, adds m/ (A1*A2...*
Ai) conduction impedance of a N grades of switches obtains new target output value Res, enters step S74 later；If m/ (A1*
A2...*Ai) N-1 grades of included switches of a N grades of switches are not all closed state, then m/ (A1*A2...*Ai) is a
Third level switch disconnects, and marking a N grades of switches of the m/ (A1*A2...*Ai) is off-state, is entered step later
S74；If Ai cannot be divided exactly by m/ (A1*A2...*A (i-1)), S74 is entered step.
In conclusion the utility model has the advantages that
1, commonplace components can be used to realize in the various devices in the utility model solid relay device, and resistance value
Can type selecting range it is wide, resistance type selecting is at low cost, at the same can also be achieved superhigh precision resistance output；
2, the utility model solid relay device can realize that 0 Ω resistance exports easily；
3, the utility model solid relay device can realize that infinite resistance exports easily；
4, the switch of the utility model solid relay device and resistance is many kinds of, can easily select very much pressure resistance etc.
The different switch and resistance of grade meets different grades of resistance to pressure request as the device for designing circuit, with this；
5, the utility model solid relay device is controlled using MCU, and MCU can support multiple communication modes,
Therefore it, it can be achieved that compatible a variety of circuits, is not used only more flexible, and helps to reduce development cost.
Although those familiar with the art answers the foregoing describe specific embodiment of the present utility model
Working as understanding, we are merely exemplary described specific embodiment, rather than for the limit to the scope of the utility model
Fixed, those skilled in the art modification and variation equivalent made by the spirit according to the utility model all should
Cover in the scope of the claimed protection of the utility model.
Claims (3)
1. a kind of solid relay device of low-cost and high-precision, it is characterised in that: including MCU, short switch and adjustable electric
Module is hindered, the output end of the adjustable resistance module is provided with one group of resistance output interface, and the short switch is connected in parallel on described
The outlet side of adjustable resistance module is in series with one group of SOUT switch between the short switch and the resistance output interface；Institute
Short switch, the adjustable resistance module and SOUT switch is stated to be connected with the MCU.
2. a kind of solid relay device of low-cost and high-precision as described in claim 1, it is characterised in that: the adjustable electric
Resistance module includes that a plurality of resistance being cascaded and a plurality of first order are switched to a plurality of N grades and switched；Per described
Resistance forms a first order with a first order switch in parallel and adjusts unit；
The every A1 continuous first order adjust unit and form adjusting unit in a second level with a second level switch in parallel；
The every A2 continuous second level adjust unit and form third level adjusting unit with a third level switch in parallel；
And so on；
Until every Ai continuous N-1 grades of adjustings units form a N grades of adjusting units with a N grades of switch in parallel；Its
In, A1 to Ai is the natural number more than or equal to 2；N is the natural number more than or equal to 3；
A plurality of first order, which are switched to a plurality of N grades of switches, to be connected with the MCU.
3. a kind of solid relay device of low-cost and high-precision as claimed in claim 2, it is characterised in that: concatenated each
In the resistance, the range of choice of first resistance is 0.6 times of the maximum resolution of entire solid relay device~
Between 0.9 times, and the choosing value range for being located at the resistance of latter one is the choosing value of the resistance positioned at front one
Between 0.6 times of range~0.9 times；The maximum resolution of the solid relay device is the sum of the resistance value of all resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820929031.9U CN208570239U (en) | 2018-06-15 | 2018-06-15 | A kind of solid relay device of low-cost and high-precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820929031.9U CN208570239U (en) | 2018-06-15 | 2018-06-15 | A kind of solid relay device of low-cost and high-precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208570239U true CN208570239U (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820929031.9U Active CN208570239U (en) | 2018-06-15 | 2018-06-15 | A kind of solid relay device of low-cost and high-precision |
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| Country | Link |
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| CN (1) | CN208570239U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108831643A (en) * | 2018-06-15 | 2018-11-16 | 福建星云电子股份有限公司 | A kind of adjustable resistor and control method of low-cost and high-precision |
-
2018
- 2018-06-15 CN CN201820929031.9U patent/CN208570239U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108831643A (en) * | 2018-06-15 | 2018-11-16 | 福建星云电子股份有限公司 | A kind of adjustable resistor and control method of low-cost and high-precision |
| CN108831643B (en) * | 2018-06-15 | 2023-06-30 | 福建星云电子股份有限公司 | Low-cost high-precision adjustable resistor and control method |
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Denomination of utility model: Digital adjustable resistor of low -cost high accuracy Effective date of registration: 20200703 Granted publication date: 20190301 Pledgee: China Exim Bank Fujian branch Pledgor: FUJIAN NEBULA ELECTRONICS Co.,Ltd. Registration number: Y2020980003784 |