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58results about How to "Reduce the number of plugging and unplugging" patented technology

Method and device for detecting insulation fault of power battery system

The invention discloses a method and device for detecting an insulation fault of a power battery system, and the method comprises the steps: detecting an insulation value between the power battery system and a vehicle frame after an insulation fault of a whole vehicle high-voltage loop is detected and positive and negative high-voltage relays are turned off, and comparing the insulation value with a preset value; determining that an insulation fault happens to a power battery in the whole vehicle high-voltage loop if the insulation value is less than the preset value, and enabling a message that the insulation fault happens to the power battery to be transmitted to a whole vehicle controller; judging that the insulation fault happens to a high-voltage load, except the power battery, in the whole vehicle high-voltage loop if the insulation value is not less than the preset value, and transmitting a message that the insulation fault happens to the high-voltage load, except the power battery, in the whole vehicle high-voltage loop to the whole vehicle controller. The method can determine that the insulation fault happens to the power battery or other high-voltage loads, thereby greatly reducing the inspection difficulty of the insulation fault of the vehicle. The method does not need to carry out the disassembly of a connector assembly in the insulation inspection process of the whole vehicle, and improves the connection reliability of devices.
Owner:GAC AION NEW ENERGY AUTOMOBILE CO LTD

Wireless cache recorder

The invention belongs to the technical field of aviation electronics and particularly relates to a wireless cache recorder. The wireless cache recorder comprises a power module, a data management module, a wireless communication module and an antenna, wherein the power module is connected with the data management module and the wireless communication module; and the data management module is connected with the wireless communication module which is connected with the antenna. The wireless cache recorder has the advantages that a direct, reliable and fast point-to-point data exchange channel can be established between an airplane and a data analysis center of an airline company without huge additional investment and any human intervention after a commercial wireless network all over the world is used to download flight data, so that the data distribution time and relay links are effectively reduced and the need of ground maintainers and the expense of supporting equipment are reduced; and therefore, the wireless cache recorder has obvious advantages in the aspects of reducing the operation cost of the airplane, improving the maintenance efficiency of the airplane, reducing the maintenance workload and the like.
Owner:SHAANXI QIANSHAN AVIONICS

Current lead structure for superconducting magnet

The invention discloses a current lead structure for a superconducting magnet, relates to a current lead structure, and provides a current lead structure for a superconducting magnet, wherein electric power can through the current lead structure, and a coolant can also pass through the current lead structure. The current lead structure for the superconducting magnet comprises a moving part and a fixed part which are axially butted, wherein the fixed part comprises a first fixed electrode and a second fixed electrode which are mutually insulated and arranged in an embedding way, a space inside the second fixed electrode is a coolant receiving channel; the moving part comprises a first moving electrode and a second moving electrode which are mutually insulated and embedded and arranged, a space inside the second moving electrode is a coolant guiding channel; and the end part of the first moving electrode and the end part of the first fixed electrode are conducted through contact, the end part of the second moving electrode and the end part of the second fixed electrode are conducted through contact and sealed, and the coolant guiding channel is communicated with a coolant receiving channel. Magnetizing and bleeding a superconducting coil by connecting a power supply and adding or reducing a coolant in a low temperature closed container holding the superconducting coil can be realized through the current lead structure.
Owner:ALLTECH MEDICAL SYST

Multi-shooting tissue clamp

The invention relates to the technical field of minimally invasive surgical instruments and particularly relates to a multi-shooting tissue clamp. The tissue clamp comprises a shell, sliding ring, a flexible pipe, at least two clamping mechanisms and an operation rod, wherein the sliding ring is connected with the shell in a sliding manner; the flexible pipe is fixed at one end of the shell and iscommunicated with the shell; the clamping mechanism is mounted in the flexible pipe and can be pushed out of the flexible pipe; two ends of the operation rod are respectively connected with the clamping mechanisms and the sliding ring; and at least two clamping mechanisms are distributed along the axial direction of the flexible pipe, the sliding ring slides to push the clamping mechanisms out ofthe flexible pipe through the operation rod, and when a tissue is clamped by virtue of the clamping mechanism located outside the flexible pipe, the operation rod is pulled to be separated from the clamping mechanism and is connected with the next clamping mechanism, and the next clamping mechanism can be pushed by the operation rod and can be used for separating the last clamping mechanism fromthe flexible pipe. According to the technical scheme, the surgical operation process is greatly simplified, the efficiency of a hemostasis surgery is effectively improved, the plugging number of timesduring the single surgery is reduced, the service life of a pincers channel is prolonged, and the equipment cost is lowered.
Owner:ZHUJI PENGTIAN MEDICAL DEVICES

Improved transfusion alarm and use method thereof

The invention relates to an improved transfusion alarm and a use method thereof. The transfusion alarm comprises a liquid level detection device and an alarming device, wherein the liquid level detection device comprises a puncture needle body, a prism, a first optical fiber, a second optical fiber and an optical fiber connecting head; and the alarming device comprises an optical fiber connecting seat, a light emitting diode, a photosensitive diode, a signal amplification circuit, a reference voltage circuit, a comparison circuit, a singlechip microcomputer, a sound-light alarm circuit, an electronic switch, a peripheral circuit and the like. The improved transfusion alarm is simple in structure, safe and reliable, low in manufacturing cost and convenient to use, and is suitable for mass production and large-scale use, and the working amount of nurses is not increased; a photoelectrical principle is used to detect the liquid level; the optical fibers are utilized to transmit signals to the alarming device; the transfusion alarm is high in alarming accuracy, and is not influenced by the factors such as medicine liquid containers and the liquid level detection device; and electrolytic reaction cannot be generated on the medicine liquid. With the adoption of the transfusion alarm, the liquid level detection device is separated from the alarming device; and the liquid level detection device is extremely low in cost and is disposable, so that safety is ensured; and the alarming device can be used repeatedly, and has the characteristics of energy conservation, environment friendliness and the like.
Owner:包云芸

Test fixture and test method

The invention discloses a test fixture and a test method. The test fixture comprises a base, connecting components and a plug. Each connecting component comprises a socket, a connecting interface and a connector. The socket is used for installing a product to be tested and supplying power to the product to be tested. The connecting interface is used for being connected with the output end of the product to be tested. One end of the connector is electrically connected with the connecting interface, and the other end is used for being electrically connected with a test device so as to transmit the electric signals outputted by the product to be tested to the test device. One end of the plug is electrically connected with the socket, and the other end is used for being electrically connected with an external power supply so as to supply power to the socket. According to the technical scheme, multiple sets of connecting components are arranged on the same base, each connecting component can perform installation testing on one power supply product, and the whole set of the power supply product is directly moved to the next test position without unplugging the power supply product when testing of the test position is completed so that the plugging frequency of the power supply product can be effectively reduced, test speed can be enhanced and the appearance beauty of the power supply product can be guaranteed.
Owner:广东省博康电子有限公司

Electronic device provided with two USB interfaces

The invention provides an electronic device provided with two USB interfaces. The electronic device mainly comprises a first USB interface module, a second USB interface module, a memory module, a control storage module electrically connected with the memory module, and a switch module which is electrically connected with the control storage module, the first USB interface module, and the second USB interface module respectively. When the switch module is turned on, data storage of the memory module is performed by the control storage module of the electronic device via the first USB interface module; and when the switch module is turned off, data storage of the memory module is performed by the control storage module of the electronic device via the second USB interface module The electronic device provided with two USB interfaces can be connected with a computer via the other USB interface when data storage is performed, and data can be modified at the same time, so that time is saved, plugging and unplugging times are reduced, and damages on the USB interfaces are avoided effectively.
Owner:KUNDA COMP TECHKUSN +1

Mobile terminal and earphone

The embodiment of the invention provides a mobile terminal and an earphone. The mobile terminal includes an upper cover, a lower cover, a first preset number of contact springs and an earphone circuit. A first preset number of hole grooves are arranged symmetrically on the same side of the upper cover and the lower cover. When the upper cover and the lower cover are closed, a first preset number of loudspeaker holes are formed. Each hole groove of the lower cover is provided with one contact spring. Each contact spring is used for being clamped with an insert post contact of each insert post in the earphone when an earphone plug is plugged into the mobile terminal. Each contact spring is connected with the earphone circuit. According to the invention, the loudspeaker holes can also be used as earphone interfaces.
Owner:VIVO MOBILE COMM CO LTD

Multi-frequency point phase distribution method for radar antenna array elements

The invention belongs to the field of microwave measurement, and relates to a multi-frequency point phase distribution method for radar antenna array elements. The multi-frequency point phase distribution method comprises the following steps: S1, connecting a test probe into an appointed antenna array element; S2, sending control information corresponding to a frequency point of the appointed antenna array element to an array plane control source by a control computer; S3, measuring data corresponding to the frequency point by using a vector network analyzer, and transmitting the data to the control computer through a GPIB (general purpose interface bus) cable; S4, storing the data in a corresponding database after the data under the frequency point is received by the control computer and corresponding data processing is performed; S5, judging whether the phase distribution of all the frequency points of one array element is finished or not; S6, judging whether the phase distribution of all the frequency points of all the array elements is finished or not. The plug time of each frequency point is greatly reduced, so the plug time of a whole phase distribution cycle is further shortened, manpower, material resources and financial resources in the phase distribution process are saved, and the development cycle and the production cycle are greatly shortened.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA

Rotary type safety power strip

The invention relates to a power strip, in particular to a rotary type safety power strip. The rotary type safety power strip comprises a wire, an upper power strip cover and a lower power strip cover; power strip panels are arranged on the upper power strip cover and each provided with a null line jack and a live line jack, the lower power strip cover is provided with null line clamping slots and live line clamping slots with conductive copper sheets, the null line clamping slots and the live line clamping slots are symmetrical with the null line jacks and the live line jacks, one sides of the null line jacks and the live line jacks extend in the opposite directions to form arc slots of 30-90 degrees, the arc slot of each null line jack and the arc slot of the corresponding live line jack are concentric, the null line clamping slots and the live line clamping slots are open in one side in the extending direction of the null line jacks and the live line jacks, and the conductive copper sheets are open in one sides of the openings of the null line clamping slots and the live line clamping slots respectively. The effect of switching on and switching off a power source is achieved by rotating plugs, the power source can be switched off without need of pulling out the plugs or the frequency of plugging is reduced, the danger of electric shock is reduced, and use is safer.
Owner:WUXI X RES PROD DESIGN & RES

A New Separate Controllable Urinary Catheter

The invention discloses a novel separating type controllable catheter which comprises a catheter body. A bag body is arranged on the catheter body. A conveying tube connected with the bag body is arranged on the side edge of the catheter body. The catheter body is formed by connecting a front flow guide tube and a drainage tube. The bag body is arranged on the front flow guide tube. The front end of the front flow guide tube is provided with a telescopic tube section. A catheterization hole is formed in the telescopic tube section and located in the middle of the bag body. The front flow guide tube is provided with a pressing device to be connected with the telescopic tube section. The pressing device controls the telescopic tube section to act to enable the catheterization hole to extend out of the bag body or extend into the middle of the bag body. According to the novel separating type controllable catheter, the design is user-friendly, the length of the catheter body can be greatly shortened after the drainage tube is separated, the front flow guide tube inserted into the bladder can be automatically controlled by a patient for urination, no inconvenience is brought even though the front flow guide tube is inserted into the bladder for a long time, catheter inserting-pulling frequency can be reduced, and the pains of the patient are reduced.
Owner:尹伟强

Mouse

A mouse comprises a body and an inductor and a controller which are arranged in the body. The mouse is characterized in that the controller is provided with a mouse function control module, a data storage module and a network communication control module. The invention integrates wireless fidelity, data storage and the mouse creatively, dispenses with connection with the independent communication media again, can surf the internet without increasing the peripheral components of the computer and reduces the plug-pull frequency of the peripheral connecting interfaces of the computer, thus greatly reducing the probability of computer failure and damage.
Owner:昆山富泰科电脑有限公司

A FPGA emulator switching device and method

The invention provides a switching device and method for an FPGA emulator, comprising a shell and an intermediate conversion module; the shell is provided with an input port and more than two output ports; it also includes a switch button to control the intermediate conversion module, and the input port and the output port The corresponding relationship is selected; more than two output ports are connected to the indicator lights, which correspond to the output ports one by one; when there is one input port, the switch button controls the intermediate conversion module to select the output port corresponding to the input port; the input port includes n, and the output port There are n ports, when n≥2; the connection indicators of the input ports correspond to the input ports one by one; the switch button controls the middle switching module to select the connection correspondence between a single input port and a single output port, and the m input ports actually used One-to-one connected connection relationship with m output ports, and none connected connection relationship. The number of plugging and unplugging of the FPGA board interface and the plugging and unplugging of the emulator is reduced, and at the same time, the probability of easy damage due to multiple plugging and unplugging of the download port of the emulator is reduced.
Owner:CHENGDU AEROSPACE COMM EQUIP CO LTD

Track inspection system host

The invention relates to a track inspection system host which comprises a host case, an inspection server and a control device, wherein the inspection server and the control device are arranged inside the host case. A signal input interface and more than one misplug prevention signal output interface are formed in the host case, the control device comprises a power device, a signal distribution module and a programmable controller, the signal input interface is connected with the signal distribution module, the misplug prevention signal output interfaces are connected with the inspection server, the power device and the signal distribution module, and the inspection server, the programmable controller and the signal distribution module are sequentially connected. The inspection server and the control device are fixedly mounted in the host case, cable connection is performed in the host case, the host case with the misplug prevention signal output interfaces is high in integration level, connection errors can be prevented, the track inspection system host is convenient to mount and use, and the service life of the host can be prolonged.
Owner:北京鹰路科技有限公司

Data processing device and mainboard thereof

The invention relates to a data processing device and a mainboard thereof, and the mainboard used by the data processing device consists of two subboards, wherein a first subboard is fixedly connected with the data processing device, and a second subboard is connected with the first subboard through a connector. The components needing to be replaced frequency such as data processing assemblies, data storing assemblies and the like are arranged on the second subboard. In addition, a hard disc signal flat cable, an optical disk signal flat cable or a screen signal flat cable are capable to be electrically connected on the first subboard, therefore, the second subboard can be taken out from the data processing device for replacing components without dismantling a case when the data processing device is updated or maintained, thus reducing the plugging times of the connecting lines.The invention has the advantages of facilitating disassembly and replacement of components, improving universality of the mainboard, reducing the plugging times of the connecting lines when the data processing device is disassembled, and prolonging the service life of the connecting lines.
Owner:ELITEGROUP COMPUTER SYSTEMS

Relay protection device and safety isolation control method and control device thereof

The invention relates to a relay protection device and a safety isolation control method and a control device thereof. The relay protection device comprises a safety isolation control device, wherein the safety isolation control device and the control method are respectively applicable to an intelligent transformer station; an optical port receiving and sending safety isolation module is arranged in the control device; during the safety isolation, a control instruction of stopping the operation is sent to a corresponding optical port module; the corresponding optical port module is controlled to stop operation; the safe isolation of the rely protection device is realized. The control device has the advantages that during the safety isolation, the number of times of plugging and unplugging optical fiber when an optical port of the relay protection device is isolated can be reduced; the misoperation risk on the relay protection device is reduced; the service life of the optical port of the device and the service life of optical fiber are prolonged; the reliable transmission of information is guaranteed.
Owner:XUJI GRP +2

Current lead structure for superconducting magnet

The invention discloses a current lead structure for a superconducting magnet, relates to a current lead structure, and provides a current lead structure for a superconducting magnet which can be energized and can pass through a coolant. The current lead structure for a superconducting magnet includes a moving part and a fixed part that are axially butted; the fixed part includes a first fixed electrode and a second fixed electrode that are insulated from each other and are nested, and the inner space of the second fixed electrode is for receiving coolant. channel; the moving part includes a first moving electrode and a second moving electrode that are insulated from each other and nested, and the inner space of the second moving electrode is a coolant conducting channel; the end of the first moving electrode is in contact with the end of the first fixed electrode The end portion of the second moving electrode and the end portion of the second fixed electrode conduct through contact and are closed and communicate with the coolant conducting channel and the coolant receiving channel. The superconducting coil is connected to a power source for magnetization, energy discharge, and adding and subtracting coolant to the low-temperature closed container accommodating the superconducting coil can be realized by the present invention.
Owner:ALLTECH MEDICAL SYST

Server

The invention discloses a server, which comprises a shell; a mobile platform which is arranged in the shell and capable of moving between a first position and a second position to pass in and out of the shell; and mainboards installed on the mobile platform. According to the server, all the mainboards are arranged on the mobile platform. When the mainboards are damaged, the mainboards can be directly pulled out from the mobile platform for maintenance or change without pulling out the whole server from a cabinet, so that, technicians can conveniently maintain and change the mainboards, and the maintenance time of the mainboards is shortened and the maintenance efficiency is improved. In addition, as the plugging time of the server is reduced, the service life of the server is further prolonged, and the operating cost of a machine room is reduced.
Owner:BEIJING BAIDU NETCOM SCI & TECH CO LTD

Novel test fixture and test method suitable for microwave assembly

The invention provides a novel test fixture suitable for a microwave assembly and a test method. The novel test fixture comprises a test base, a left side fixing frame, a right side fixing frame, an A-type combined fixture and a B-type combined fixture, wherein the left side fixing frame, the right side fixing frame, the A-type combined fixture and the B-type combined fixture are detachably assembled on the test base; the fastening positions of the left side fixing frame and the right side fixing frame on the test base are adjustable; one end of the A-type combined clamp and one end of the B-type combined clamp are connected with a port of the microwave assembly, the other end of the A-type combined clamp and the other end of the B-type combined clamp are connected with a port of testing equipment, and the A-type combined clamp and the B-type combined clamp are detached after being completely tested along with the microwave assembly. According to the invention, the microwave assembly is rapidly positioned by using the combined clamp, and the test of the microwave assembly can be rapidly completed, so that the test efficiency of the microwave assembly is greatly improved, the damage of repeated plugging to a product interface can be avoided, and the test efficiency of the microwave assembly and the product reliability are greatly improved.
Owner:BEIJING RES INST OF TELEMETRY +1

Device and method for testing standing-wave ratio of multi-unit radio frequency antenna and antenna feeder system

The invention is suitable for the field of aviation testing, and provides a multi-unit radio frequency antenna and antenna feeder system standing-wave ratio testing device which comprises an antenna feeder adaptation assembly, a control assembly and a connecting cable. The antenna feeder adapter assembly comprises an external screw inner hole coaxial connector, a radio frequency circuit board, an earphone socket and four ARINC600 SIZE1 radio frequency coaxial adapters; according to the characteristics of the multi-unit radio frequency antenna, a radio frequency switch chip is taken as a core, a peripheral control circuit and a power supply circuit are designed, a correct method for testing the multi-unit antenna and an adaptive device required by the method are provided, the method and the device avoid the use of an incorrect test method from a device end, and the test efficiency is improved. The test data can be accurately and efficiently acquired, the plugging times of the coaxial connector of the test equipment and the tested antenna feeder system are reduced by half, and the service life of the coaxial connector is prolonged under the condition of the same test times.
Owner:宁波易测电子科技有限公司

Ultrasonic probe extension and connection dock

The present invention discloses an ultrasonic probe extension and connection dock. The ultrasonic probe extension and connection dock comprises an extension dock panel, and the extension dock panel is fixed on a portable-type or trolley-type ultrasonic host; the extension dock panel is provided with a switch, signal output ends, a plurality of probe interfaces, probe signal input channels and channel buttons, the switch controls opening or closing of the extension dock panel, the channel buttons are in an one-to-one correspondence with the probe signal input channels to realize switching of each probe signal input channel, the plurality of the probe interfaces can be respectively connected with ultrasonic probes, each probe interface is in an one-to-one correspondence with the probe signal input channel, and the signal output ends are connected with signal input ends of the portable-type or trolley-type ultrasonic host. The ultrasonic probe extension and connection dock greatly reduces inserting and extracting times of the ultrasonic probes, reduces loss of the probe interfaces of the ultrasonic host and has strong practicability.
Owner:万东百胜(苏州)医疗科技有限公司

FPGA emulator switching device and method

The invention provides a FPGA emulator switching device and method. The FPGA emulator switching device comprises a shell, an intermediate switching module, a switching button and more than two output port connected indicator lamps; wherein the shell is provided with input ports and more than two output ports; the switching button controls the intermediate switching module to select the corresponding relationship between the input ports and the output ports; and the output port connected indicator lamps correspond to the output ports one by one. When the number of the input port is one, the switching button controls the intermediate switching module to select the output port corresponding to the input port; when the number of the input ports is n, then the number of the output ports is n, and the n is greater than or equal to 2; the indicator lamps connect the input ports and correspond to the input ports one by one; and the switch button controls the intermediate switching module to select the connection relationship between a single input port and a single output port, the one by one connection relationship between the actually used m input ports and m output ports, and the connection relationship that is not connected. By means of the FPGA emulator switching device, the number of insertion and extraction times of the FPGA card interface and the number of insertion and extraction times of the emulator are reduced, and the probability of easy damage caused by the multiple times of insertion and extraction of the emulator downloader is reduced.
Owner:CHENGDU AEROSPACE COMM EQUIP CO LTD

Nuclear power plant driving mechanism insulation and direct-current resistance tester

The invention discloses a nuclear power plant driving mechanism insulation and direct-current resistance tester. The tester comprises an insulation resistance tester, a direct-current resistance tester and a switching control device; the insulation resistance tester is connected with a nuclear power plant driving mechanism and detects the insulation resistance of the nuclear power plant driving mechanism; the direct-current resistance tester is connected with the nuclear power plant driving mechanism and tests the direct-current resistance of the test nuclear power plant driving mechanism; andthe switching control module is connected with the insulation resistance tester and the direct-current resistance tester, and controls the insulation resistance tester and the direct-current resistance tester to work alternately. With the nuclear power plant driving mechanism insulation and direct-current resistance tester of the invention adopted, the insulation coefficients and direct-current resistance parameters of hundreds of driving mechanisms in a nuclear power plant reactor can be quickly and efficiently measured, manpower and time costs can be significantly reduced, and the safety ofstaff can be improved.
Owner:上海东缘机电设备有限公司 +1

Novel energy-saving plug

The invention belongs to the technical field of electric connectors and specifically provides a novel energy-saving plug including pin, a plug body, a connector, a plug wire and a button. According to the invention, whether an electricity consuming device is in a working state or not is judged through current detection. When the electricity consuming device is not in the working state, automatic power cut of the plug is implemented. The plug can be connected to another plug through the connector, so as to implement a function of an extension plug. Since separate connection / disconnection control is set for the pins and a circuit board, accidents in a plugging moment are avoided. The bottom of the plug body is also provided with a groove, so that plugging and unplugging are facilitated. The plug can save electricity consumption of the electricity consuming device in the non-working state, reduces plug plugging and unplugging times, avoids risks of electric shock caused by finger slipping when plugging or unplugging the plug. At the same time, automatic starting after power restoration since a power switch is not switched off timely in power failure is avoided, so that safety is ensured.
Owner:西安神盾信息技术安全有限责任公司

A Radar Antenna Array Element Multi-frequency Matching Method

The invention belongs to the field of microwave measurement, and relates to a method for multi-frequency point matching of radar antenna array elements, which includes the following steps: Step 1: Connect a test probe to a designated antenna array element; The source sends the control information corresponding to a frequency point of the specified antenna element; Step 3: Measure the data of the corresponding frequency point with a vector network analyzer, and transmit it to the control computer through the GPIB cable; Step 4: The control computer receives the data at this frequency point The data is stored in the corresponding database after corresponding data processing. Step 5: Judging whether the matching of all frequency points of an array element is completed; Step 6: Judging whether matching of all frequency points of all array elements is completed. The number of times of plugging and unplugging at each frequency point is greatly reduced, thereby reducing the plugging and unplugging time of the entire matching cycle, saving manpower, material resources, and financial resources in the matching process, and greatly shortening the development and production cycle.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA

docking station

The present application discloses a docking station, comprising: a main body structure (100), which is provided with at least two expansion interfaces (110), and the upper side of the main structure (100) is used for the rear area of ​​the lower side of the notebook computer to be placed; Two clamping structures (200) are disposed opposite to each other in the left-right direction, at least one clamping structure (200) can slide in the left-right direction relative to the main structure (10), and at least one clamping structure (20) is provided with at least one A conductive structure (210), the conductive structure (210) includes a first electrical connector (211) and a second electrical connector (212), and the first electrical connector (211) clamps a notebook computer between the two clamping structures (200) When plugged into the side port of the notebook computer. The docking station is connected with the notebook computer as a whole, and can be used continuously as a whole, which reduces the times of plugging and unplugging the notebook computer and the docking station, and prolongs the service life of the notebook computer.
Owner:FULLINK TECH CO LTD
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