CN213149586U - Multi-interface intrinsically safe embedded mainboard - Google Patents
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- CN213149586U CN213149586U CN202022196810.2U CN202022196810U CN213149586U CN 213149586 U CN213149586 U CN 213149586U CN 202022196810 U CN202022196810 U CN 202022196810U CN 213149586 U CN213149586 U CN 213149586U
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Abstract
The utility model belongs to the technical field of embedded system, concretely relates to embedded mainboard of many interfaces safe type of essence. The utility model comprises a central processing unit and a memory; the central processing unit is respectively connected with a serial port for connecting computer debugging and a plurality of peripheral interfaces, the peripheral interfaces comprise a VGA display interface, an RJ45 network interface, an LED indicator light interface, a buzzer interface, an RS485 interface and a USB interface, and the mutual transmission of data is realized; the interfaces are connected with the external module, and electromagnetic compatibility is ensured among the interfaces; the central processor is also connected with a D/A module and an A/D module. The utility model has strong anti-electromagnetic interference ability, good stability and meets the explosion-proof requirement; the requirement on the intrinsically safe circuit is met.
Description
Technical Field
The utility model belongs to the technical field of embedded system, concretely relates to embedded mainboard of many interfaces safe type of essence.
Background
Along with the rapid development of economy and science and technology, the intelligent instrument obtains the wide application in explosive dangerous gas environment such as oil, chemical industry, gas, colliery, but the intelligent instrument that uses on the existing market mainly is explosion-proof type explosion-proof design, and the instrument is heavy, and be not convenient for carry and control, for developing light in weight, be convenient for carry and control convenient safe type intelligent instrument of essence, just at first will develop the core component of intelligent instrument: the multi-interface intrinsically safe embedded mainboard.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-interface intrinsically safe embedded mainboard which has strong anti-electromagnetic interference capability and good stability and meets the explosion-proof requirement; the requirement on the intrinsically safe circuit is met.
The utility model adopts the technical proposal that:
a multi-interface intrinsically safe embedded mainboard comprises a central processing unit, a memory, a VGA display interface, an RJ45 network interface, an LED indicator lamp interface, a buzzer interface, an RS485 interface, a USB interface, a D/A module and an A/D module; the central processing unit is respectively connected with a serial port for connecting computer debugging and a plurality of peripheral interfaces, the peripheral interfaces comprise a VGA display interface, an RJ45 network interface, an LED indicator light interface, a buzzer interface, 2 RS485 interfaces and a USB interface, and the mutual transmission of data is realized; the interfaces are connected with the external module, and electromagnetic compatibility is ensured among the interfaces; the central processing unit is also connected with a system bus and IO; one of the 2 RS485 interfaces is connected with an external explosion-proof touch liquid crystal display screen and realizes the mutual transmission of data; the other one is connected with an internal intrinsic safety power system module and realizes the mutual transmission of data; the USB interface is used for connecting with external data storage equipment and realizing the mutual transmission of data; the central processing unit is further connected with a D/A module and an A/D module, wherein an external current signal of the oil gas concentration alarm instrument transmits a signal to one A/D module, the A/D module transmits the signal to the central processing unit, and the explosion-proof gas mass flow controller transmits data with the central processing unit through the paired D/A module and the paired A/D module.
The central processor adopts an I.MX6ULL chip and a single Arm Cortex-A7 kernel, and the running speed is as high as 800 MHz; the memory adopts low-voltage LPDDR3 with the capacity of 512MB, the memory chip is eMMC with the capacity of 4 GB.
The VGA display interface is 15 pins, supports two resolutions of 800 × 600 and 1024 × 768, realizes VGA display in a mode of converting RGB signals into VGA signals, and adopts an ADV7123 chip, and the RGB and ADV7123 chips also adopt a 74LVC8T245PW chip.
The RJ45 network interface adapts to 10/100M network interface, and KSZ8081RNB is adopted.
The LED indicator lamp interface adopts a 2pin base with the thickness of 2.0mm, and the current is limited by a 1K resistor, so that the LED lamp is prevented from being burnt out due to overlarge current; the buzzer interface is connected with a 5V passive buzzer as an indication alarm signal, a triode S9013 is used as a switching tube, and the sound tone of the buzzer is controlled through the PWM signal frequency and the duty ratio.
The RS485 chip adopts UM3483EESA to provide complete RS485 compatibility for +15KV ESD protection, slew rate limitation and an ultra-low differential line transceiver, and simultaneously adopts a 3.3V single power supply to supply power.
The USB adopts a HOST equipment HOST interface, adopts a USBHUB chip GL850G, has four split and supports the USB specification of 2.0/1.1.
The signal source of the A/D module is current loop output, the current signal is converted into a voltage signal through a resistor, then measurement is carried out, the ADS8866 is adopted as a conversion chip, and small-sized isolation power supply modules are adopted among the A/D modules, so that the A/D modules are mutually electrically isolated; connected by a daisy chain; TVS protection is added at the input end; reverse protection is added at the input end.
The D/A modules adopt current loop output and AD5422, and the D/A modules adopt isolation power supply modules to be isolated from each other; connected by a daisy chain; and TVS protection is added at the output end of the current loop.
The intrinsic safety power supply system module is isolated from the mainboard; the main board power supply chip adopts MP2159 GJ.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the utility model provides a multi-interface intrinsically safe embedded mainboard which is used for a calibration device of an oil gas concentration detection alarm system and is convenient to access current signals of an explosion-proof mass flow controller and an oil gas concentration detection alarm instrument;
(2) the utility model provides an embedded mainboard of many interfaces essence safety type, consider portable reliability and explosion-proof of calibrating installation, adopt anti-electromagnetic interference ability reinforce, satisfy explosion-proof requirement, the integrative plate structure design that stability is good, wholly adopt 4 layers of PCB design, divide top surface layer, ground plane, power supply layer, bottom surface layer, each part power and ground connection of mainboard keep apart, analog circuit, digital circuit distribution and overall arrangement safe distance are wide enough, D/A and A/D module have independent power module all the way, make D/A and A/D module keep apart with other circuits;
(3) the utility model provides an embedded mainboard of many interfaces essential safety type ib explosion-proof requirement design, circuit power source adopt 5V-DC low voltage, and electric current, energy storage element's capacitance and inductance value, electric clearance and creepage distance all satisfy and accord with GB3836.1-2010 "1 st part of electrical equipment for explosive gas environment in the well way: general requirements, GB3836.4-2010 "part 4 of an electrical apparatus for explosive gas atmosphere: intrinsically safe "i" protected devices "require intrinsically safe circuits.
Drawings
Fig. 1 is a schematic diagram of the structure of the multi-interface intrinsically safe embedded motherboard provided by the present invention.
Detailed Description
The following describes the multi-interface intrinsically safe embedded motherboard in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model provides an embedded mainboard of many interfaces intrinsic safety type for oil gas concentration detection alarm system verification calibrating device, including central processing unit, memory, VGA display interface, RJ45 network interface, LED pilot lamp interface, bee calling organ interface, RS485 interface, USB interface, D/A module, AD module;
the central processor adopts an I.MX6ULL chip of NXP company, the i.MX6ULL is an application processor series with high efficiency and high cost performance, a single Arm Cortex-A7 inner core is adopted, and the running speed is as high as 800 MHz. The memory adopts low-voltage LPDDR3 with the capacity of 512MB, the memory chip is eMMC with the capacity of 4 GB. The configuration can ensure the smooth operation of the linux system, store data and exert the highest performance of the system. The central processing unit is respectively connected with a serial port for connecting computer debugging and a plurality of peripheral interfaces, the peripheral interfaces comprise a VGA display interface, an RJ45 network interface, an LED indicator light interface, a buzzer interface, 2 RS485 interfaces and 3 USB interfaces, and data transmission is realized; the interfaces are connected with corresponding external modules, and electromagnetic compatibility design is added among the interfaces;
this mainboard adopts 5V 2A DC power supply, with first type peripheral equipment connecting terminal: 15VDC, connecting an explosion-proof gas mass flow controller with a second type peripheral device: and 24VDC, and accessing an oil gas concentration detection alarm. The power supply to the connected devices is isolated from the motherboard and is designed to prevent interference between the devices.
The mainboard power supply chip is selected according to the power-on time sequence requirements of each voltage of the CPU and the working voltage and current of the chip, the voltage of the CPU core is 0.925V-1.4V, MP2159GJ of MPS company is selected, the maximum current is 1A, the current required by the highest frequency of the CPU is met, and 1.4V is obtained through voltage division of two precise resistors.
The memory model is magnesium light MT41K256M16HA-125E, the voltage is 1.35V, MP2159GJ of MPS company is selected, the maximum current is 1A, the current required by the 400MHZ frequency of the memory is met, and 1.35V is obtained by dividing the voltage through two precise resistors.
The central processing unit is also connected with a system bus and IO, the voltage of an IO port is 3.3V, the MP2144GJ is selected, the maximum current is 2A, an enabling pin is connected with an open-drain reset chip, an input pin of the reset chip is connected with a reset key and a Power key, and the Power key is pressed for a long time, so that the on-off can be realized.
The VGA display interface is 15 pins, two resolutions of 800 × 600 and 1024 × 768 are supported, the central processing unit does not have VGA signals, the VGA display is realized by converting RGB signals into VGA signals, an ADV7123 chip is adopted, and 74LVC8T245PW chips are also adopted for RGB type and ADV7123, so that the driving capability is increased, and the anti-interference capability is improved.
The ADV7123 is a single-chip, three-channel, high-speed digital-to-analog converter with three built-in high-speed, 10-bit, video digital-to-analog converters with complementary outputs, a standard TTL input interface, and a high-impedance, analog output current source.
The method comprises the following steps: 330 MSPS;
the device is provided with three channels and a 10-bit digital-analog converter;
the compatible output of RS-343A/RS-170 is supported;
supporting complementary output;
fifthly, the output current range of the DAC: 2mA to 26 mA;
supporting TTL compatible input;
using a 1.23V internal reference voltage source;
and 5V/3.3V single power supply is adopted for supplying power;
low self-sustaining power consumption: 30mW (minimum, 3V), standby mode: 6mW (typical value, 3V); the RJ45 network interface accommodates the 10/100M network interface, choosing KSZ8081RNB, KS28081 to be a single power supply 10BASE-T/100BASE-TX Ethernet physical layer transceiver for transmitting and receiving data over standard CAT-5 Unshielded Twisted Pair (UTP) cable. The circuit is simple to build, and remote transmission, remote login and the like of data can be realized.
The method comprises the steps of adopting an RMII/RMI mode;
the back-to-back mode is supported, and the 100Mbps copper repeater is supported;
the MDC/MDIO management interface is used for configuring the PHY register;
fourthly, programmable interrupt output;
fifthly, outputting LEDs for indicating states of the link, the activity and the speed;
sixthly, terminating resistors on the chip for the differential pair;
pruning-baseline drift correction;
and HP automatic MDI/M DI-X, through forbid and enable option detect and correct straight-through and cross cable connection reliably;
auto-negotiation of self-drilling, automatic selection of highest link speed (10/100Mbps) and duplex mode (half duplex/full duplex)
The power-down mode and the energy-saving mode are supported;
the LinkMD is based on TDR cable diagnosis and is used for identifying faulty copper cable wiring;
the parameterized NAND tree is supported by the core, and fault detection can be performed between the chip I/O and the circuit board;
the selection HBM ESD rating is: 6 kV;
loop-back mode for diagnostics is supported;
the self-sensing adopts a single power supply of 3.3V; VDD l/0 option with 1.8V, 2.5V, or 3.3V;
a built-in 1.2V voltage stabilizer supporting the kernel in a presence/absence manner;
the LED indicating lamp interface adopts a 2pin base with the thickness of 2.0mm, and the current is limited by a 1K resistor, so that the LED lamp is prevented from being burnt out due to overlarge current.
The buzzer interface is connected with a 5V passive buzzer as an indication alarm signal. A triode S9013 is used as a switching tube, and the sound tone of the buzzer is controlled through the PWM signal frequency and the duty ratio.
One of the 2 RS485 interfaces is connected with an external explosion-proof touch liquid crystal display screen and realizes the mutual transmission of data; the other one is connected with an internal intrinsic safety power system module and realizes the mutual transmission of data;
RS485 is a standard defined to balance the electrical characteristics of drivers and receivers in digital multipoint systems, which is defined by the telecommunications industry association and the electronics industry consortium. The digital communication network using the standard can effectively transmit signals under long-distance conditions and in environments with large electronic noise.
The RS485 chip selects UM3483EESA, provides complete RS485 compatibility for +15KV ESD protection, slew rate limitation and an ultra-low differential line transceiver, and simultaneously adopts a 3.3V single power supply for power supply. Each device contains a driver and a receiver designed for data transmission with an extended common mode range (-7V to 12V). UM3483E has slew rate limited drivers that minimize driver EMI and reduce reflections caused by improperly terminated cables, allowing error free data transmission at data rates up to 500 kbps. All devices have enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs were protected to 15kV using IEC 1000-4-2 air gap discharge, using a human model to protect 15 kV. The driver is limited by the short circuit current and protected by the thermal shutdown circuit to prevent excessive power consumption, thereby placing the driver output in a high impedance state. The receiver inputs have a fail-safe function that can guarantee a logic high level output when both inputs are open, shorted or idle.
The 3 USB interfaces are used for being connected with external data storage equipment and realizing mutual data transmission.
The USB adopts a HOST device HOST interface, adopts a USB BUB chip GL850G, and can completely support the USB2.0/1.1 specification by one drive by four, so that the USB can be completely compatible with a HOST side or transmission connection (high-speed/full-speed/low-speed device transmission) of other USB device interfaces. GL850G also provides overload protection, provides good EMI/ESD handling, and self-power and bus-power auto-detect modes, so that the user does not have to re-insert or unplug the device. Since the hub is a relay station between the host computer and the peripheral devices, the market demand of the USB hub has grown greatly in view of the market popularity of the USB peripheral devices and the popularity of the peripheral devices. The GL850G can be used in different application fields such as an independent hub, a notebook computer base, or a USB composite hub combined with other USB devices, which not only simplifies the wiring method, but also helps the user to easily manage and achieve the purpose of expanding the performance. 3 USB ports of mainboard extension support USB keyboard input, other USB main equipments such as USB flash disk.
The central processing unit is further connected with a D/A module and an A/D module, wherein an external current signal of the oil gas concentration alarm instrument transmits a signal to one A/D module, the A/D module transmits the signal to the central processing unit, and the explosion-proof gas mass flow controller transmits data with the central processing unit through the paired D/A module and the paired A/D module.
The device comprises 5 paths of A/D modules and 4 paths of D/A modules, wherein two paths of A/D modules and two paths of D/A modules are reserved, and the verification and calibration device only uses 3 paths of A/D modules and 2 paths of D/A modules;
and the signal source of the 5 paths of A/D modules is output by a current loop. The signal is transmitted with a current because the current is not sensitive to noise. The 4-20 mA current loop is widely applied, 4mA is used for representing a zero signal, 20mA is used for representing the full scale of the signal, and signals lower than 4mA and higher than 20mA are used for alarming various faults, such as open circuit and the like.
For convenience of measurement, the design directly adopts a precision resistor to convert a current signal into a voltage signal, then measurement is carried out, and ADS8866 of TI company is selected as a conversion chip, and the conversion chip is mainly characterized in that:
first 16-bit sampling accuracy. If ADS8866 fails to meet the requirements, there are also alternative models in its family with 18-bit accuracy
And the sampling rate reaches 100 kSPS. If ADS8866 can not meet the requirement, 250kSPS, 400kSPS, 500kSPS, 680kSPS and 1MSPS are also available in the family cluster
Successive approximation type (SAR) analog-to-digital converter
And a single-pole input is adopted, and a 5.0V reference is selected. If ADS8866 fails to meet the requirements, there are alternative models of true differential inputs in its family
Fifthly SPI compatible serial interface with daisy chain option
Sixthly, excellent alternating current and direct current performances:
-signal-to-noise ratio (SNR): 93dB, THD: -108 Db;
-integral non-linearity (INL): ± 1.0LSB (typical value), ± 2.0LSB (maximum value);
-DNL: 1.0LSB (max), 16 bit no loss code (NMC);
the training is low in power consumption, and is only 0.7 mW;
industrial temperature range: -40 ℃ to +85 ℃;
in the design, the 5-path A/D module is further optimized:
the method comprises the steps that a small-sized isolation power supply module is adopted, so that the A/D modules are mutually electrically isolated;
the control is convenient, and the 5-path ADCs are connected by adopting a daisy chain, so that the control is very concise;
the input end is protected by TVS;
the input end is added with reverse protection;
4-way D/A module
The D/A module is output by adopting a current loop, and an output signal is 4-20 mA. We use current to transmit signals because current is not sensitive to noise. The 4-20 mA current loop uses 4mA to represent a zero signal, uses 20mA to represent the full scale of the signal, and uses the signal which is lower than 4mA and higher than 20mA to alarm various faults.
Aiming at the requirements, AD5422 of ADI company is finally selected, and the main characteristics are as follows:
making a first 16-bit resolution and a monotonicity;
the current output range is: 4mA to 20mA, 0mA to 24mA, total misalignment error (TUE): ± 0.01% (typical value, FSR), output drift: plus or minus 3 ppm;
the flexible serial digital interface is adopted;
fourth, reference voltage source inside the slice: maximum temperature drift of 10 ppm/deg.C
Output loop compliance voltage: 9.5V (Voltage when DAC output open circuit)
Sixthly, industrial temperature range: -40 ℃ to +85 DEG C
In the design, the 4-path D/A module performs the following optimization treatment:
the method comprises the steps of adopting isolation power supply modules to perform mutual isolation;
the control is convenient, and the 4 paths of D/A modules are connected by adopting daisy chains, so that the control is very concise;
the TVS protection is added at the output end of the current loop;
supplementary explanation: because the four groups of A/D modules and D/A modules share the signal ground, the A/D modules and the D/A modules in the four groups are not electrically isolated, and each path of the A/D modules and the D/A modules is provided with an independent power supply module, so that the A/D modules and the D/A modules are isolated from other circuits.
And the use of a USB differential line is considered in LAYOUT, and the impedance matching is carried out according to 90 ohms, so that the stability is improved. Data lines and address lines of the eMMC memory are processed in equal length.
This embedded mainboard is according to the explosion-proof design of safe type of essence, and explosion-proof grade is ib grade, and technical characterstic is as follows:
the ib class circuit cannot ignite an explosive gas mixture during both normal operation and a fault. Namely, the safety factor is 2 when the device works normally; the safety factor is 1.5 when one fault occurs.
2. The parameters of energy storage devices (capacitance and inductance) are required to be kept with 150% allowance besides meeting the working requirements by avoiding easily explosive devices such as tantalum capacitors and electrolytic capacitors as much as possible.
3. The number of energy storage components should be limited, as little as possible, in the early stages of ensuring functionality.
4. The heat rising characteristics of the power dissipation element are fully considered.
5. The device has reliable independent grounding, and system grounding, AD and DA signal circuit grounding of each path and shielding grounding are independent grounding.
6. And finally, an overvoltage protection circuit is designed at the 5V input end of the main board power supply to prevent the chip from being burnt due to overvoltage to generate spark heat to detonate combustible gas.
The above description is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept thereof equally within the technical scope disclosed in the present invention, and all the modifications should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a many interfaces intrinsically safe type embedded mainboard which characterized in that: the system comprises a central processing unit, a memory, a VGA display interface, an RJ45 network interface, an LED indicator lamp interface, a buzzer interface, an RS485 interface, a USB interface, a D/A module and an A/D module; the central processing unit is respectively connected with a serial port for connecting computer debugging and a plurality of peripheral interfaces, the peripheral interfaces comprise a VGA display interface, an RJ45 network interface, an LED indicator light interface, a buzzer interface, 2 RS485 interfaces and a USB interface, and the mutual transmission of data is realized; the interfaces are connected with the external module, and electromagnetic compatibility is ensured among the interfaces; the central processing unit is also connected with a system bus and IO; one of the 2 RS485 interfaces is connected with an external explosion-proof touch liquid crystal display screen and realizes the mutual transmission of data; the other one is connected with an internal intrinsic safety power system module and realizes the mutual transmission of data; the USB interface is used for connecting with external data storage equipment and realizing the mutual transmission of data; the central processing unit is further connected with a D/A module and an A/D module, wherein an external current signal of the oil gas concentration alarm instrument transmits a signal to one A/D module, the A/D module transmits the signal to the central processing unit, and the explosion-proof gas mass flow controller transmits data with the central processing unit through the paired D/A module and the paired A/D module.
2. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the central processor adopts an I.MX6ULL chip and a single Arm Cortex-A7 kernel, and the running speed is as high as 800 MHz; the memory adopts low-voltage LPDDR3 with the capacity of 512MB, the memory chip is eMMC with the capacity of 4 GB.
3. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the VGA display interface is 15 pins, supports two resolutions of 800 × 600 and 1024 × 768, realizes VGA display in a mode of converting RGB signals into VGA signals, and adopts an ADV7123 chip, and the RGB and ADV7123 chips also adopt a 74LVC8T245PW chip.
4. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the RJ45 network interface adapts to 10/100M network interface, and KSZ8081RNB is adopted.
5. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the LED indicator lamp interface adopts a 2pin base with the thickness of 2.0mm, and the current is limited by a 1K resistor, so that the LED lamp is prevented from being burnt out due to overlarge current; the buzzer interface is connected with a 5V passive buzzer as an indication alarm signal, a triode S9013 is used as a switching tube, and the sound tone of the buzzer is controlled through the PWM signal frequency and the duty ratio.
6. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the RS485 chip adopts UM3483EESA to provide complete RS485 compatibility for +15KV ESD protection, slew rate limitation and an ultra-low differential line transceiver, and simultaneously adopts a 3.3V single power supply to supply power.
7. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the USB adopts a HOST equipment HOST interface, adopts a USBHUB chip GL850G, has four split and supports the USB specification of 2.0/1.1.
8. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the signal source of the A/D module is current loop output, the current signal is converted into a voltage signal through a resistor, then measurement is carried out, the ADS8866 is adopted as a conversion chip, and small-sized isolation power supply modules are adopted among the A/D modules, so that the A/D modules are mutually electrically isolated; connected by a daisy chain; TVS protection is added at the input end; reverse protection is added at the input end.
9. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the D/A modules adopt current loop output and AD5422, and the D/A modules adopt isolation power supply modules to be isolated from each other; connected by a daisy chain; and TVS protection is added at the output end of the current loop.
10. The multi-interface intrinsically safe embedded motherboard of claim 1, wherein: the intrinsic safety power supply system module is isolated from the mainboard; the main board power supply chip adopts MP2159 GJ.
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| CN113193879A (en) * | 2021-05-28 | 2021-07-30 | 慧感(上海)物联网科技有限公司 | Multi-interface-based explosion-proof industrial data transmission device and data transmission method thereof |
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|---|---|---|---|---|
| CN113193879A (en) * | 2021-05-28 | 2021-07-30 | 慧感(上海)物联网科技有限公司 | Multi-interface-based explosion-proof industrial data transmission device and data transmission method thereof |
| CN113193879B (en) * | 2021-05-28 | 2023-10-31 | 慧感(上海)物联网科技有限公司 | Explosion-proof industrial data transmission device based on multiple interfaces and data transmission method thereof |
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Effective date of registration: 20231018 Address after: 100076 No. 2, 6 East guard Road, Beijing, Fengtai District Patentee after: BEIJING AERONAUTICAL ENGINEERING TECHNOLOGY RESEARCH CENTER Address before: 100076 No. 2, 6 East guard Road, Beijing, Fengtai District Patentee before: BEIJING AERONAUTICAL ENGINEERING TECHNOLOGY RESEARCH CENTER Patentee before: BEIJING KINGSUN ELECTRONICS Co.,Ltd. |
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Inventor after: Yue Bin Inventor after: Li Shengqiang Inventor after: Wang Xiaoyu Inventor before: Yue Bin Inventor before: Li Shengqiang Inventor before: Wang Xiaoyu Inventor before: OuYang Hui |
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