CN107706977B - Charging current detection method and charging device - Google Patents
Charging current detection method and charging device Download PDFInfo
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- CN107706977B CN107706977B CN201710962190.9A CN201710962190A CN107706977B CN 107706977 B CN107706977 B CN 107706977B CN 201710962190 A CN201710962190 A CN 201710962190A CN 107706977 B CN107706977 B CN 107706977B
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- 208000032953 Device battery issue Diseases 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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Abstract
The invention discloses a charging current detection method and a charging device, wherein the charging current detection method is applied to the charging device and comprises the following steps: when the charging device is connected with the electronic equipment for charging, signals of a D + signal line and/or a D-signal line in the charging device are changed; different signals of the D + signal line and/or the D-signal line are used for enabling the electronic equipment to be switched to different charging modes; respectively detecting charging currents of the electronic equipment in different charging modes; and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment. By the mode, signals of the signal lines in the charging device can be changed under the condition that the charging device is not switched, so that the charging mode of the electronic equipment is correspondingly switched, the charging current of the electronic equipment in different charging modes is measured, and the charging process of the electronic equipment can be conveniently and quickly detected.
Description
Technical Field
The present invention relates to the field of charging technologies, and in particular, to a method for detecting a charging current and a charging device.
Background
Existing electronic devices each include a built-in battery to power the electronic device. The electric quantity of the battery is connected to an external power supply through a charging wire to supply power, and specifically, the battery is charged in a charging mode.
With the development of electronic devices and the diversification of functions, when a battery of the electronic device is charged, diversified charging modes can be adopted, each charging mode corresponds to different charging currents, and the different charging currents are suitable for different states of the electronic device.
Disclosure of Invention
In order to solve the technical problems, the invention adopts a technical scheme that: the detection method of the charging current is applied to a charging device and comprises the following steps: when the charging device is connected with the electronic equipment for charging, signals of a D + signal line and/or a D-signal line in the charging device are changed; different signals of the D + signal line and/or the D-signal line are used for enabling the electronic equipment to be switched to different charging modes; respectively detecting charging currents of the electronic equipment in different charging modes; comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a charging device, the device including: the first connecting end is connected with a power supply or an external terminal; the second connecting end is connected with the electronic equipment; the first connecting end and the second connecting end are connected through a line, and the line at least comprises a D + signal line and a D-signal line; the control circuit is connected with the D + signal line and/or the D-signal line and is used for changing signals of the D + signal line and/or the D-signal line; different signals of the D + signal line and/or the D-signal line are used for enabling the electronic equipment to be switched to different charging modes; the detection circuit is used for detecting the charging current of the electronic equipment in different charging modes so as to compare the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode, thereby judging the charging performance of the electronic equipment.
Drawings
Fig. 1 is a schematic flowchart of a charging current detection method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for detecting a charging current according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging device according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for detecting a charging current according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of another embodiment of a charging device provided in the present invention;
fig. 6 is a schematic structural diagram of a charging device according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart illustrating a method for detecting a charging current according to still another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a charging device according to still another embodiment of the present invention;
fig. 9 is a schematic structural diagram of an embodiment of a charging system provided in the present invention;
fig. 10 is a schematic structural diagram of another embodiment of the charging system provided in the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second", and the like in the present invention are used for distinguishing different objects, not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The communication equipment provided by the embodiment of the invention can be a mobile phone, a tablet personal computer, intelligent wearable equipment and the like.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for detecting a charging current, the method including:
step 11: when the charging device is connected with the electronic equipment for charging, the signals of the D + signal line and/or the D-signal line in the charging device are changed.
Wherein different signals of the D + signal line and/or the D-signal line are used for switching the electronic equipment to different charging modes.
As can be appreciated, the existing charging device generally includes an adapter and a USB connection line, and the adapter and the USB connection line are connected in a pluggable manner. The plug of adapter grafting external power source, the USB connecting wire is connected electronic equipment, and the port that the USB connecting wire is connected electronic equipment then can be different according to electronic equipment's model difference, specifically can be Micro-USB interface, Type-c interface or Lightning interface.
The adapter includes various types, for example, a common adapter may include an adapter with a charging current of 1A and an adapter with a charging current of 2A. When different adapters are adopted for charging, the electronic equipment can be switched to different charging modes according to different adapters. For example, when the adapter is an adapter with a 1A charging current, the electronic device switches the charging mode to the 1A charging mode, so as to perform charging safely and quickly.
In particular, in the prior art, different adapters are specifically used for changing signals of a D + signal line and a D-signal line in a USB interface so as to enable an electronic device to switch to a corresponding charging mode according to different signals. For example, one adapter shorts the D + signal line and the D-signal line in the USB interface, and the other adapter disconnects the D + signal line and the D-signal line in the USB interface. Due to the fact that the connection modes of the D + signal line and the D-signal line in the USB interface are different, signals transmitted by the USB interface change, and therefore the electronic equipment can be switched to the corresponding charging mode according to the difference of the signals.
In the prior art, it is often detected whether a charging process of an electronic device is normal, and specifically, whether a charging current is normal. For example, it is detected whether the actual charging current of the electronic device is 1A in the charging mode with 1A current, if yes, it indicates that the charging process of the electronic device is normal, and if no, it indicates that the charging process of the electronic device is abnormal, and there may be a problem such as a battery failure or a charging circuit failure.
When detecting charging current, in order to comprehensively detect whether the current of the electronic device is normal in different charging modes, the prior art is to replace different adapters, so that the electronic device switches different charging modes according to different adapters, and then detect whether the charging current of the electronic device in each charging mode meets the requirements. In such a mode, the adapter needs to be replaced for many times, the adapter is inconvenient, and the battery can be damaged by plugging and unplugging the power supply for many times in the charging process.
Therefore, in step 11 of the present embodiment, the signals of the D + signal line and/or the D-signal line in the charging device can be changed by providing a control circuit in the charging device or receiving a corresponding control signal.
The charging mode may include fast charging, trickle charging, and the like, and in addition, different charging modes may also be adopted for different functions when the electronic device is charged, for example, a mobile phone charges while taking a picture, or a mobile phone charges while turning on a flashlight, and the like.
Step 12: the charging currents of the electronic equipment in different charging modes are respectively detected.
Alternatively, in an embodiment, the charging current of the electronic device may be detected by detecting the current of the charging line in the charging device. In another embodiment, the charging current of the electronic device can be detected.
Step 13: and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment.
For example, in the set charging mode, the standard charging current is 1A, and in this mode, the detected charging current is 1A, the charging performance of the electronic device is determined to be good, and if the detected charging current is not 1A and the difference from 1A is greater than the set threshold, the charging performance of the electronic device is determined to be poor. Specifically, the specific determination may be made according to a specific difference between the charging current and the standard current, and details are not repeated here.
Unlike the prior art, the method for detecting the charging current of the present embodiment includes: when the charging device is connected with the electronic equipment for charging, signals of a D + signal line and/or a D-signal line in the charging device are changed; different signals of the D + signal line and/or the D-signal line are used for enabling the electronic equipment to be switched to different charging modes; respectively detecting charging currents of the electronic equipment in different charging modes; and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment. By the mode, signals of the signal lines in the charging device can be changed under the condition that the charging device is not switched, so that the charging mode of the electronic equipment is correspondingly switched, the charging current of the electronic equipment in different charging modes is measured, and the charging process of the electronic equipment can be conveniently and quickly detected.
Referring to fig. 2, fig. 2 is a schematic flow chart of another embodiment of a method for detecting a charging current according to the present invention, the method includes:
step 21: when the charging device is connected with the electronic equipment for charging, the D + signal line and the D-signal line in the charging device are in short circuit or disconnected.
Step 22: the charging currents of the electronic equipment in different charging modes are respectively detected.
Step 23: and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment.
It can be understood that in the prior art, different adapters are specifically used for changing signals of a D + signal line and a D-signal line in a USB interface so as to enable an electronic device to switch to a corresponding charging mode according to different signals. For example, one adapter shorts the D + signal line and the D-signal line in the USB interface, and the other adapter disconnects the D + signal line and the D-signal line in the USB interface. Due to the fact that the connection modes of the D + signal line and the D-signal line in the USB interface are different, signals transmitted by the USB interface change, and therefore the electronic equipment can be switched to the corresponding charging mode according to the difference of the signals.
In the embodiment, the short circuit and disconnection of the D + signal line and the D-signal line are realized by designing a special control circuit.
As shown in fig. 3, in an embodiment of the charging device provided by the present invention, the charging device includes a first connection terminal 31, a second connection terminal 32, a control circuit 33, and a detection circuit 34.
The first connection end 31 is connected to a power supply or an external terminal, and the second connection end 21 is connected to an electronic device.
It is understood that the first connection terminal 31 and the second connection terminal 32 are connected by a line, and the line includes at least a D + signal line and a D-signal line. Specifically, in an embodiment, the first connection terminal 31, the second connection terminal 32 and the circuit therebetween form a USB data line, where the first connection terminal 31 is a USB interface, and the second connection terminal 32 is a Micro-USB interface, a Type-c interface, or a Lightning interface. The signal line between the first connection terminal 31 and the second connection terminal 32 includes VCC (positive electrode), a D-signal line, a D + signal line, and GND (ground terminal).
Optionally, the first connection end 31 is a USB interface, and may be directly connected to a USB interface of the terminal for charging, for example, a USB interface of a computer end is plugged, in addition, the USB interface may also be plugged into an adapter, and the adapter is plugged into a charging socket.
The control circuit 33 is connected to the D + signal line and the D-signal line, and configured to short-circuit or disconnect the D + signal line and the D-signal line when the charging device is connected to the electronic device for charging.
Optionally, the control circuit 33 is further connected to an external terminal, such as a computer, the external terminal sends a control command to the control circuit 33, and the control circuit 33 operates according to the received control command.
The detection circuit 34 is configured to detect the charging current of the electronic device in different charging modes, so as to compare the charging current of the electronic device in different charging modes with the standard charging current of the corresponding mode, thereby determining the charging performance of the electronic device.
Alternatively, in an embodiment, the charging device may be directly modified from the existing USB connection line, for example, the control circuit 33 and the detection circuit 34 are disposed in the USB connection line, and a third connection terminal is led out from the existing USB connection line for connecting an external terminal to receive a control command.
Alternatively, in another embodiment, the charging device may be an adapter, and the adapter includes a first connection terminal 31, a second connection terminal 32, and a third connection terminal (i.e., a connection terminal of the control circuit 33 connected to the external terminal). The first connection end 31 is directly connected to a power supply or a terminal, or connected to the power supply or the terminal through a data line, the second connection end 32 is directly connected to the electronic device, or connected to the electronic device through a data line, and the third connection end is connected to an external terminal, or connected to the external terminal through a data line.
Referring to fig. 4, fig. 4 is a schematic flow chart of a charging current detection method according to another embodiment of the present invention, the method includes:
step 41: when the charging device is connected with the electronic equipment for charging, the impedance between the D + signal line and/or the D-signal line and the grounding terminal in the charging device is changed.
Step 42: the charging currents of the electronic equipment in different charging modes are respectively detected.
Step 43: and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment.
In the present embodiment, the change of the impedance between the D + signal line or the D-signal line and the ground is realized by designing a special control circuit.
As shown in fig. 5, in another embodiment of the charging device provided by the present invention, the charging device includes a first connection terminal 31, a second connection terminal 32, a control circuit 33, and a detection circuit 34.
The first connection end 31 is connected to a power supply or an external terminal, and the second connection end 21 is connected to an electronic device.
It is understood that the first connection terminal 31 and the second connection terminal 32 are connected by a line, and the line includes at least a D + signal line and a D-signal line. Specifically, in an embodiment, the first connection terminal 31, the second connection terminal 32 and the circuit therebetween form a USB data line, where the first connection terminal 31 is a USB interface, and the second connection terminal 32 is a Micro-USB interface, a Type-c interface, or a Lightning interface. The signal line between the first connection terminal 31 and the second connection terminal 32 includes VCC (positive electrode), a D-signal line, a D + signal line, and GND (ground terminal).
Optionally, the first connection end 31 is a USB interface, and may be directly connected to a USB interface of the terminal for charging, for example, a USB interface of a computer end is plugged, in addition, the USB interface may also be plugged into an adapter, and the adapter is plugged into a charging socket.
The control circuit 33 is connected to the D + signal line and the ground GND, and is configured to change an impedance between the D + signal line and the ground GND when the charging device is connected to the electronic device for charging. Alternatively, the control circuit 33 may be a potentiometer, the control circuit 33 is further connected to an external terminal, such as a computer, the external terminal sends a control command to the control circuit 33, and the control circuit 33 changes the impedance according to the received control command.
In addition, as shown in fig. 6, the control circuit 33 may be further connected to the D-signal line and the ground GND for changing the impedance between the D-signal line and the ground GND when the charging device is connected to the electronic apparatus for charging. Alternatively, the control circuit 33 may be a potentiometer, the control circuit 33 is further connected to an external terminal, such as a computer, the external terminal sends a control command to the control circuit 33, and the control circuit 33 changes the impedance according to the received control command.
It will be appreciated that varying the impedance between the D + or D-signal line and the ground GND varies the signal in the D + or D-signal line, thereby causing the electronic device to switch between different charging modes.
Specifically, taking the circuit of fig. 5 as an example, the magnitude of the impedance, the correspondence between different signals and the charging mode may be preset, for example, when the electronic device needs to be switched to the trickle charging mode, a corresponding control instruction is sent to the control circuit 33 through the terminal, the control circuit 33 changes the impedance between the D + signal line and the ground GND to a corresponding resistance value, then the signal on the D + signal line changes, and the electronic device switches the charging mode to the trickle charging mode according to the signal on the D + signal line.
The detection circuit 34 is configured to detect the charging current of the electronic device in different charging modes, so as to compare the charging current of the electronic device in different charging modes with the standard charging current of the corresponding mode, thereby determining the charging performance of the electronic device.
Alternatively, in an embodiment, the charging device may be directly modified from the existing USB connection line, for example, the control circuit 33 and the detection circuit 34 are disposed in the USB connection line, and a third connection terminal is led out from the existing USB connection line for connecting an external terminal to receive a control command.
Alternatively, in another embodiment, the charging device may be an adapter, and the adapter includes a first connection terminal 31, a second connection terminal 32, and a third connection terminal (i.e., a connection terminal of the control circuit 33 connected to the external terminal). The first connection end 31 is directly connected to a power supply or a terminal, or connected to the power supply or the terminal through a data line, the second connection end 32 is directly connected to the electronic device, or connected to the electronic device through a data line, and the third connection end is connected to an external terminal, or connected to the external terminal through a data line.
Referring to fig. 7, fig. 7 is a schematic flow chart of a charging current detection method according to another embodiment of the present invention, the method including:
step 71: when the charging device is connected with the electronic equipment for charging, the first end acquires an instruction sent by an external terminal, and the second end sends the instruction to the electronic equipment; the instruction is used for enabling the electronic equipment to be switched to different charging modes.
Step 72: the charging currents of the electronic equipment in different charging modes are respectively detected.
Step 73: and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode to judge the charging performance of the electronic equipment.
The charging device of the present embodiment is a USB cable.
It is understood that since the USB connection line includes VCC (positive), a D-signal line, a D + signal line, and GND (ground). The signal lines D-signal line and D + signal line can be used to transmit control commands, so in this embodiment, the signal lines in the USB connection line are directly used to transmit control commands.
As shown in fig. 8, in another embodiment of the charging device provided by the present invention, the charging device has a first connection terminal 31 and a second connection terminal 32. The first connection end 31 is connected to an external terminal, and the second connection end 21 is connected to an electronic device.
It is understood that the first connection terminal 31 and the second connection terminal 32 are connected by a line, and the line includes at least a D + signal line and a D-signal line. Specifically, in an embodiment, the first connection terminal 31, the second connection terminal 32 and the circuit therebetween form a USB data line, where the first connection terminal 31 is a USB interface, and the second connection terminal 32 is a Micro-USB interface, a Type-c interface, or a Lightning interface. The signal line between the first connection terminal 31 and the second connection terminal 32 includes VCC (positive electrode), a D-signal line, a D + signal line, and GND (ground terminal).
It should be noted that, since the first connection end 31 in the embodiment is to receive the control command sent by the terminal, the first connection end 31 is directly plugged into an external terminal, such as a computer, without being plugged into a power socket through an adapter.
When charging, the external terminal can directly send the control instruction to the electronic equipment through a data line (a D + signal line and/or a D-signal line) in the USB connecting line, and the electronic equipment directly switches the corresponding charging mode according to the control instruction so as to realize current detection in different charging modes.
Referring to fig. 9, the present invention further provides a charging system, which includes a power source 91, a charging device 92, an electronic device 93, and a terminal 94.
The charging device 92 is connected to the power supply 91, the electronic device 93, and the terminal 94 through three connection terminals.
The electronic device 93 may be a mobile phone, a tablet, or an intelligent wearable device, and the terminal 94 may be a computer.
When the charging device 92 is connected to the power supply 91 and the electronic device 93 for charging, the terminal 94 sends a control instruction to the charging device 92 to change signals of a D + signal line and a D-signal line, wherein different signals of the D + signal line and/or the D-signal line are used for switching the electronic device 93 to different charging modes.
The charging device 92 is the charging device according to the above embodiments, and may be a USB connection line or a charging adaptor, which is not described herein again.
Referring to fig. 10, the present invention further provides another charging system, which includes a terminal 94, a charging device 92 and an electronic device 93 connected in sequence.
When the charging device 92 is connected with the terminal 94 and the electronic device 93 for charging, the terminal 94 sends a control instruction to the charging device 92 to change signals of a D + signal line and a D-signal line, wherein different signals of the D + signal line and/or the D-signal line are used for switching the electronic device 93 to different charging modes.
It is to be understood that in the present embodiment, the electronic device 93 is charged through the terminal 94.
The charging device 92 is the charging device according to the above embodiments, and may be a USB connection line or a charging adaptor, which is not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A charging current detection method applied to a charging device, wherein the charging device is connected between an external terminal and an electronic device to charge the electronic device through the external terminal, the charging device comprises a VCC power supply line, a GND ground line, a D + signal line and a D-signal line, and a potentiometer is further connected between the D + signal line and/or the D-signal line and the GND ground line, and the method comprises the following steps:
when the charging device is connected with the electronic equipment for charging, acquiring a control instruction sent by the external terminal;
changing the impedance of a potentiometer based on the control instruction to further change the impedance between the D + signal line and/or the D-signal line and the GND ground line, thereby changing the signal transmitted by the D + signal line and/or the D-signal line to cause the electronic device to switch to a different charging mode in response to the change in the signal transmitted by the D + signal line and/or the D-signal line;
respectively detecting charging currents of the electronic equipment in different charging modes;
and comparing the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode, and determining that the charging performance of the electronic equipment does not pass when the difference value between the detected charging current and the standard charging current is greater than a set threshold value.
2. A charging device, comprising:
the first connecting end is connected with an external terminal;
the second connecting end is connected with the electronic equipment; the external terminal charges the electronic equipment through the charging device, the first connecting end and the second connecting end are connected through a line, and the line comprises a VCC power supply line, a GND ground line, a D + signal line and a D-signal line;
a control circuit, connected to the external terminal and the D + signal line and/or the D-signal line, wherein a potentiometer is further connected between the D + signal line and/or the D-signal line and the GND ground, the control circuit is connected to the potentiometer, and is configured to receive a control instruction sent by the external terminal, and change an impedance of the potentiometer based on the control instruction, so as to further change an impedance between the D + signal line and/or the D-signal line and the GND ground, thereby changing a signal transmitted by the D + signal line and/or the D-signal line, so that the electronic device is switched to a different charging mode in response to a change in the signal transmitted by the D + signal line and/or the D-signal line;
the detection circuit is connected with the VCC power supply line and the GND ground wire and used for detecting the charging current of the electronic equipment in different charging modes so as to compare the charging current of the electronic equipment in different charging modes with the standard charging current of the corresponding mode, and when the difference value of the detected charging current and the standard charging current is greater than a set threshold value, the charging performance of the electronic equipment is determined not to pass.
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| CN111896884B (en) * | 2020-07-31 | 2023-11-14 | 北京小米移动软件有限公司 | Charging detection method and device |
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| CN106716389A (en) * | 2014-08-05 | 2017-05-24 | 德州仪器公司 | Methods, electronic devices, and charger apparatus for quick USB charging |
| CN106655316A (en) * | 2016-09-21 | 2017-05-10 | 奇酷互联网络科技（深圳）有限公司 | Charging circuit and terminal equipment |
| CN206272290U (en) * | 2016-12-16 | 2017-06-20 | 深圳市方格子电子有限公司 | Intelligent protection data wire |
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| CN107706977A (en) | 2018-02-16 |
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