CN109031004A - USB charging wire detection device - Google Patents

USB charging wire detection device Download PDF

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Publication number
CN109031004A
CN109031004A CN201811020827.3A CN201811020827A CN109031004A CN 109031004 A CN109031004 A CN 109031004A CN 201811020827 A CN201811020827 A CN 201811020827A CN 109031004 A CN109031004 A CN 109031004A
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China
Prior art keywords
electrically connected
wire
tested
detection module
power supply
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CN201811020827.3A
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Chinese (zh)
Inventor
汪顺祥
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Guangdong Pineng Industrial Co ltd
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Guangdong Pineng Industrial Co ltd
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Priority to CN201811020827.3A priority Critical patent/CN109031004A/en
Publication of CN109031004A publication Critical patent/CN109031004A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a USB charging wire detection device, which comprises a power supply module and a charging detection module, wherein the power supply module can be electrically connected with one end of a tested wire, the charging detection module can be electrically connected with the other end of the tested wire, the power supply module, the power line of the tested wire, the ground wire of the tested wire and the charging detection module form a detection loop to detect the quality of the tested wire, the power supply module, the power line of the tested wire, the charging detection module and the ground wire of the tested wire are connected to form the charging detection loop by using the detection device of the charging detection module and the power supply detection module, whether the process of a USB charging wire is qualified or not and whether the whole wire is broken or not can be analyzed and detected by using the voltage difference value of the power supply module and the first load of the charging detection module, the fault phenomenon that equipment works abnormally is effectively avoided, and the production quality of the USB charging wire is ensured, and the after-sale cost is reduced.

Description

A kind of USB charging line detector
Technical field
The present invention relates to data line field, especially a kind of detection device applied to USB charging cable.
Background technique
USB charging cable is the key lines that existing mobile terminal or other computer peripherals are connect with computer equipment Road.There are two types of general USB charging cables, and one is the charging cable for being able to carry out data transmission, the positive and negative data lines of this data line All it is conducting, can charges also and can be carried out data transmission；A kind of charging cable for being primarily used for charging to terminal device, The positive and negative data line of this charging cable is shorted, and can enable terminal device to one, terminal device feedback when grafting in port Charging.The intact USB charging cable of one quality is very important, but irregular due to production technology, and especially one A little long USB charging cables, the part of in-between line segment connector will appear open circuit or other techniques are underproof existing As causing USB charging cable to cannot proceed normally use.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of USB charging line detectors.
The technical solution adopted by the present invention is that:
A kind of USB charges line detector, including power supply module and charging detecting model, and the power supply module can be with One end electrical connection of tested wire rod, the charging detecting model can be electrically connected with the other end of tested wire rod, and mould of powering Block, the power supply line of tested wire rod, charging detecting model, tested wire rod ground wire to connect and compose charging measure loop tested to detect The quality of the charging circuit of wire rod.
The charging detecting model includes the first load, first voltage table, and one end of first load is respectively with first The power supply line electrical connection of positive, the tested wire rod of voltmeter, the other end of the first load respectively with the cathode of first voltage table, quilt Survey line material is electrically connected to ground.
The charging detecting model further includes the first indicator light and the first current-limiting resistance, the anode of first indicator light It is electrically connected with one end of the first current-limiting resistance, the cathode of the first indicator light and one end of the first load electrically connect, first limit The other end of leakage resistance and the other end of the first load electrically connect.
Further include data port detection module, the data port detection module respectively with the negative data line of tested wire rod, Whether the electrical connection of correction data line is shorted between the negative data line of tested wire rod and correction data line with detecting.
The data port detection module include the second indicator light and DC power supply, second indicator light anode and The anode electrical connection of DC power supply, the cathode of the second indicator light are electrically connected with the negative data line of tested wire rod, the DC power supply Cathode be electrically connected with the correction data line of tested wire rod.
The power supply module is provided with the first attachment base, and first attachment base can electrically be inserted with one end of tested wire rod It connects, the first attachment base is provided with the first terminal being electrically connected with the positive output end of power supply module and the negative output with power supply module The Second terminal of electrical connection is held, the first terminal can be electrically connected with the power supply line of the tested wire rod, the Second terminal It can be electrically connected to ground with tested wire rod.
The charging detecting model is provided with the second attachment base, and second attachment base can be with the other end of tested wire rod Electrical grafting is provided with the third terminal being electrically connected with one end of charging detecting model on the second attachment base, examines with data port The forth terminal for surveying the output end electrical connection of module, the 5th terminal that is electrically connected with the input terminal of data port detection module and The 6th terminal being electrically connected with the other end of charging detecting model, the third terminal are electrically connected with the power supply line of tested wire rod, The forth terminal is electrically connected with the negative data line of tested wire rod, and the correction data line of the 5th terminal and tested wire rod is electrically connected It connects, the 6th terminal is electrically connected to ground with tested wire rod.
It further include data transmission detection module, the data transmission detection module can be electrically connected with the other end of tested wire rod It connects, and the negative data line of power supply module, the correction data line of tested wire rod, data transmission detection module, tested wire rod connects structure The quality of the data transmission link of tested wire rod is detected at Data Detection circuit.
The data transmission detection module includes the second load and second voltage table, one end difference of second load Be electrically connected with the negative data line of positive, the tested wire rod of second voltage table, second other end loaded respectively with second voltage table Cathode, tested wire rod the electrical connection of correction data line.
Data transmission detection module further includes third indicator light and third current-limiting resistance, the third indicator light Anode is electrically connected with one end of third current-limiting resistance, and the cathode of the third indicator light and one end of the second load electrically connect, institute The other end of the other end and the second load of stating third current-limiting resistance electrically connects.
Beneficial effects of the present invention:
The detection device of current a charging detecting model and power supply module, power supply module, fill the power supply line for being tested wire rod Electro-detection module, the ground wire for being tested wire rod connect and compose charging measure loop, and the voltage of power supply module power supply and charging is utilized to examine Survey the voltage difference of the first load of module, can analysis detection go out USB charging cable technique whether qualification and whole route It is whether breaking, the abnormal phenomenon of the failure of equipment work is effectively prevented, has ensured the production quality of USB charging cable, reduction is sold Cost afterwards.
Detailed description of the invention
A specific embodiment of the invention is described further with reference to the accompanying drawing.
Fig. 1 is the schematic diagram of present invention detection one type wire rod；
Fig. 2 is the schematic diagram of present invention detection another type wire rod.
Specific embodiment
The line detector as shown in Figure 1, a kind of USB charges, including power supply module 1 and charging detecting model 2, mould of powering Block 1 can be electrically connected with one end of tested wire rod, and charging detecting model 2 can be electrically connected with the other end of tested wire rod, and Power supply module 1, the power supply line of tested wire rod, charging detecting model 2, tested wire rod ground wire connect and compose charging measure loop with Detect the quality of the charging circuit of tested wire rod.Utilize the voltage of 1 power supply of power supply module and the first load of charging detecting model 2 21 voltage difference, can analysis detection go out USB charging cable technique it is whether qualified and whether whole route breaking, effectively keep away The abnormal phenomenon of the failure of equipment work is exempted from, has ensured the production quality of USB charging cable, reduced after cost.
Charging detecting model 2 includes the first load 21, first voltage table 22, and one end of the first load 21 is electric with first respectively The power supply line electrical connection of positive, the tested wire rod of table 22 is pressed, the other end of the first load 21 is negative with first voltage table 22 respectively Pole is tested being electrically connected to ground for wire rod.First load 21 is programmable electronic load, can need to adjust resistance according to different Size, can so obtain multiple groups experimental data, reduce experimental error.In addition to this it is possible to replace with conventional, electric-resistance One load 21.
Charging detecting model 2 further includes the first indicator light 23 and the first current-limiting resistance 24, the anode of the first indicator light 23 It being electrically connected with one end of the first current-limiting resistance 24, the cathode of the first indicator light 23 and one end of the first load 21 electrically connect, and first The other end of current-limiting resistance 24 and the other end of the first load 21 electrically connect.First indicator light 23 is light emitting diode.First limit Leakage resistance 24 is to prevent electric current, voltage are excessive from burning out the first indicator light 23 for protecting the first indicator light 23.If power supply module 1, be tested the power supply line of wire rod, charging detecting model 2, tested wire rod ground wire to connect and compose charging measure loop be that access then refers to Show that lamp is bright, it is on the contrary then do not work.In addition to this, the first indicator light 23 can also be replaced using LED lamp source, the first current-limiting resistance 24 It can also be replaced using general-purpose diode.
Further include data port detection module 3, data port detection module 3 respectively with the negative data line of tested wire rod, just Whether data line electrical connection is shorted between the negative data line of tested wire rod and correction data line with detecting.The negative data line of tested wire rod Being shorted between correction data line can enable terminal device to charge to one, terminal device feedback.
Data port detection module 3 include the second indicator light 31 and DC power supply 33, the second indicator light 31 anode and The anode electrical connection of DC power supply 33, the cathode of the second indicator light 31 are electrically connected with the negative data line of tested wire rod, DC power supply 33 cathode is electrically connected with the correction data line of tested wire rod.If the negative data line of data port detection module 3 and tested wire rod, The circuit that correction data line is formed is access, and the second indicator light 31 will be bright, then illustrates the negative data line and correction data line of survey line material Between be shorted.Second indicator light 31 is Light-Emitting Diode.In addition to this, the second indicator light 31 can also use LED light source To replace.
Data port detection module 3 further includes the second current-limiting resistance 32, one end of the second current-limiting resistance 32 and DC power supply 33 anode electrical connection, the other end of the second current-limiting resistance 32 are electrically connected with the anode of the second indicator light 31.Second current-limiting resistance 32 be to prevent electric current, voltage are excessive from burning out the second indicator light 31 for protecting the second indicator light 31.In addition to this, the second current limliting Resistance 32 can also be replaced using general-purpose diode.
Power supply module 1 is provided with the first attachment base 11, the first attachment base 11 can with one end electrical property grafting of tested wire rod, First attachment base 11 is provided with the first terminal being electrically connected with the positive output end of power supply module 1 and defeated with bearing for power supply module 1 The Second terminal of outlet electrical connection, first terminal can be electrically connected with the power supply line of tested wire rod, Second terminal can be tested Wire rod is electrically connected to ground.Because the terminal in tested wire rod socket is smaller, it is not only located inside socket and position is close, Directly connect with tested wire rod with conducting wire it is more troublesome and difficult, with one end electrical property grafting of the first attachment base 11 and tested wire rod Power supply module 1 and one end of tested wire rod can be made to be electrically connected, eliminate the trouble connected with conducting wire.
Charging detecting model 2 is provided with the second attachment base 25, and the second attachment base 25 can be with the other end electricity of tested wire rod Property grafting, the third terminal being electrically connected with one end of charging detecting model 2 is provided on the second attachment base 25, is examined with data port The forth terminal for surveying the output end electrical connection of module 3, the 5th terminal that is electrically connected with the input terminal of data port detection module 3 with And the 6th terminal being electrically connected with the other end of charging detecting model 2, third terminal are electrically connected with the power supply line of tested wire rod, the Four terminals are electrically connected with the negative data line of tested wire rod, and the 5th terminal is electrically connected with the correction data line of tested wire rod, the 6th terminal With being electrically connected to ground for tested wire rod.Because the terminal in tested wire rod socket is smaller, it is not only located at socket inside and position Set it is close, directly connect with tested wire rod with conducting wire it is more troublesome and difficult, it is another with the second attachment base 25 and tested wire rod It holds electrical grafting that charging detecting model 2 and the other end of tested wire rod can be made to be electrically connected, eliminates the trouble connected with conducting wire.
As shown in Fig. 2, further including data transmission detection module 4, data transmit detection module 4 can be another with tested wire rod One end electrical connection, and the negative of power supply module 1, the correction data line of tested wire rod, data transmission detection module 4, tested wire rod Data Detection circuit is connected and composed according to line to detect the quality of the data transmission link of tested wire rod.If tested wire rod just, Negative data line is all conducting, can thus detect whether the quality of the data transmission link of tested wire rod is qualified.
It includes the second load 41 and second voltage table 42, one end difference of the second load 41 that data, which transmit detection module 4, It is electrically connected with the negative data line of positive, the tested wire rod of second voltage table 42, the other end of the second load 41 is electric with second respectively Press the correction data line electrical connection of the cathode, tested wire rod of table 42.Second load 41 is programmable electronic load, can be according to different It needs to adjust the size of resistance, can so obtain multiple groups experimental data, reduce experimental error.In addition to this it is possible to general The resistance that is powered replaces the second load 41.
Data transmission detection module 4 further includes third indicator light 43 and third current-limiting resistance 44, third indicator light 43 Anode is electrically connected with one end of third current-limiting resistance 44, and the cathode of third indicator light 43 and one end of the second load 41 electrically connect, The other end of third current-limiting resistance 44 and the other end of the second load 41 electrically connect.Third current-limiting resistance 44 is for protecting third Indicator light 43 prevents electric current, voltage are excessive from burning out third indicator light 43.If the correction data line of power supply module 1, tested wire rod, Data transmission detection module 4, the Data Detection circuit that the negative data line of tested wire rod connects and composes are that then indicator light is bright for access, instead Do not work then.Third indicator light 43 is light emitting diode.In addition to this, third indicator light 43 can also be LED light source, third limit Leakage resistance 44 can also be general-purpose diode.
Power supply module 1 includes programmable digital power supply, ammeter and tertiary voltage table, one end of ammeter and programmable The positive output end of digital power is electrically connected, and the other end of ammeter is electrically connected with one end of tertiary voltage table, tertiary voltage table The other end is electrically connected with the negative output terminal of programmable digital power supply.
Power supply module 1 is additionally provided with third attachment base 12, and third attachment base 12 can electrically be inserted with one end of tested wire rod It connects, third attachment base 12 is provided with the 7th terminal being electrically connected with the positive output end of power supply module 1, just defeated with power supply module 1 8th terminal of outlet electrical connection, the 9th terminal, defeated with bearing for power supply module 1 being electrically connected with the negative output terminal of power supply module 1 Tenth terminal of outlet electrical connection, the 7th terminal can be electrically connected with the power supply line of tested wire rod, the 8th terminal can be tested The negative data line of wire rod is electrically connected, and the 9th terminal can be electrically connected with the correction data line of tested wire rod, and the tenth terminal can be with quilt Survey line material is electrically connected to ground.Because the terminal in tested wire rod socket is smaller, it is not only located at socket inside and position phase Closely, directly connect with tested wire rod with conducting wire it is more troublesome and difficult, it is electrical with one end of third attachment base 12 and tested wire rod Grafting can be such that power supply module 1 and one end of tested wire rod is electrically connected, and eliminate the trouble connected with conducting wire.
Charging detecting model 2 is provided with the 4th attachment base 26, and the 4th attachment base 26 can be with the other end electricity of tested wire rod Property grafting, the 11st terminal being electrically connected with one end of charging detecting model 2 is provided on the 4th attachment base 26, is transmitted with data Tenth two-terminal of one end electrical connection of detection module 4, the 13rd terminal being connect with the other end of data transmission detection module 4 And the 14th terminal connecting with the other end of charging detecting model 2, the power supply line of the 11st terminal and tested wire rod are electrically connected It connecing, the tenth two-terminal is electrically connected with the negative data line of tested wire rod, and the 13rd terminal is electrically connected with the correction data line of tested wire rod, 14th terminal is electrically connected to ground with tested wire rod.Because the terminal in tested wire rod socket is smaller, it is not only located at socket Internal and position is close, directly connect with tested wire rod with conducting wire it is more troublesome and difficult, with the 4th attachment base 26 be tested The other end electrical property grafting of wire rod can make charging detecting model 2, data transmission detection module 4 another with tested wire rod respectively End electrical connection, eliminates the trouble connected with conducting wire.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to above embodiment, as long as with Essentially identical means realize that the technical solution of the object of the invention belongs within protection scope of the present invention.

Claims (10)

1.一种USB充电线检测装置，其特征在于：包括供电模块(1)以及充电检测模块(2)，所述供电模块(1)能够与被测线材的一端电连接，所述充电检测模块(2)能够与被测线材的另一端电连接，并且供电模块(1)、被测线材的电源线、充电检测模块(2)、被测线材的地线连接构成充电检测回路以检测被测线材的充电线路的质量。1. A USB charging line detection device, characterized in that: comprising a power supply module (1) and a charging detection module (2), the power supply module (1) can be electrically connected to an end of the wire to be tested, and the charging detection module (2) It can be electrically connected to the other end of the wire to be tested, and the power supply module (1), the power line of the wire to be tested, the charging detection module (2), and the ground connection of the wire to be tested constitute a charging detection circuit to detect The quality of the charging line of the wire. 2.根据权利要求1所述的一种USB充电线检测装置，其特征在于：所述充电检测模块(2)包括第一负载(21)、第一电压表(22)，所述第一负载(21)的一端分别与第一电压表(22)的正极、被测线材的电源线电连接，第一负载(21)的另一端分别与第一电压表(22)的负极、被测线材的的地线电连接。2. A USB charging line detection device according to claim 1, characterized in that: the charging detection module (2) includes a first load (21), a first voltmeter (22), and the first load One end of (21) is electrically connected with the positive pole of the first voltmeter (22) and the power line of the wire to be tested respectively, and the other end of the first load (21) is connected with the negative pole of the first voltmeter (22) and the wire to be tested respectively. ground electrical connection. 3.根据权利要求2所述的一种USB充电线检测装置，其特征在于：所述充电检测模块(2)还包括第一指示灯(23)以及第一限流电阻(24)，所述第一指示灯(23)的正极与第一限流电阻(24)的一端电连接，第一指示灯(23)的负极与第一负载(21)的一端电联接，所述第一限流电阻(24)的另一端与第一负载(21)的另一端电联接。3. A USB charging line detection device according to claim 2, characterized in that: the charging detection module (2) also includes a first indicator light (23) and a first current limiting resistor (24), the The positive pole of the first indicator light (23) is electrically connected to one end of the first current limiting resistor (24), and the negative pole of the first indicator light (23) is electrically connected to one end of the first load (21). The other end of the resistor (24) is electrically connected to the other end of the first load (21). 4.根据权利要求2所述的一种USB充电线检测装置，其特征在于：还包括数据端口检测模块(3)，所述数据端口检测模块(3)分别与被测线材的负数据线、正数据线电连接以检测被测线材的负数据线与正数据线之间是否短接。4. A kind of USB charging line detection device according to claim 2, is characterized in that: also comprises data port detection module (3), and described data port detection module (3) is respectively connected with the negative data line of tested wire rod, The positive data line is electrically connected to detect whether there is a short circuit between the negative data line and the positive data line of the tested wire. 5.根据权利要求4所述的一种USB充电线检测装置，其特征在于：所述数据端口检测模块(3)包括第二指示灯(31)以及直流电源(33)，所述第二指示灯(31)的正极和直流电源(33)的正极电连接，第二指示灯(31)的负极与被测线材的负数据线电连接，所述直流电源(33)的负极与被测线材的正数据线电连接。5. A USB charging cable detection device according to claim 4, characterized in that: the data port detection module (3) includes a second indicator light (31) and a DC power supply (33), and the second indication The positive pole of the lamp (31) is electrically connected to the positive pole of the DC power supply (33), the negative pole of the second indicator light (31) is electrically connected to the negative data line of the wire to be tested, and the negative pole of the DC power supply (33) is connected to the wire to be tested. The positive data line is electrically connected. 6.根据权利要求5所述的一种USB充电线检测装置，其特征在于：所述供电模块(1)设置有第一连接座(11)，所述第一连接座(11)能够与被测线材的一端电性插接，第一连接座(11)设置有与供电模块(1)的正输出端电连接的第一端子以及与供电模块(1)的负输出端电连接的第二端子，所述第一端子能够与所述被测线材的电源线电连接，所述第二端子能够与被测线材的地线电连接。6. A USB charging cable detection device according to claim 5, characterized in that: the power supply module (1) is provided with a first connection seat (11), and the first connection seat (11) can be connected with the One end of the measuring wire is electrically plugged, and the first connecting seat (11) is provided with a first terminal electrically connected to the positive output end of the power supply module (1) and a second terminal electrically connected to the negative output end of the power supply module (1). terminals, the first terminal can be electrically connected to the power line of the tested wire, and the second terminal can be electrically connected to the ground wire of the tested wire. 7.根据权利要求5所述的一种USB充电线检测装置，其特征在于：所述充电检测模块(2)设置有第二连接座(25)，所述第二连接座(25)能够与被测线材的另一端电性插接，第二连接座(25)上设置有与充电检测模块(2)的一端电连接的第三端子、与数据端口检测模块(3)的输出端电连接的第四端子、与数据端口检测模块(3)的输入端电连接的第五端子以及与充电检测模块(2)的另一端电连接的第六端子，所述第三端子与被测线材的电源线电连接，所述第四端子与被测线材的负数据线电连接，所述第五端子与被测线材的正数据线电连接，所述第六端子与被测线材的地线电连接。7. A USB charging cable detection device according to claim 5, characterized in that: the charging detection module (2) is provided with a second connection base (25), and the second connection base (25) can be connected with The other end of the wire to be tested is electrically plugged in, and the second connection seat (25) is provided with a third terminal electrically connected to one end of the charging detection module (2) and electrically connected to the output end of the data port detection module (3) The fourth terminal, the fifth terminal electrically connected to the input end of the data port detection module (3) and the sixth terminal electrically connected to the other end of the charging detection module (2), the third terminal is connected to the wire to be tested The power line is electrically connected, the fourth terminal is electrically connected to the negative data line of the tested wire, the fifth terminal is electrically connected to the positive data line of the tested wire, and the sixth terminal is electrically connected to the ground wire of the tested wire. connect. 8.根据权利要求1所述的一种USB充电线检测装置，其特征在于：还包括数据传输检测模块(4)，所述数据传输检测模块(4)能够与被测线材的另一端电连接，并且供电模块(1)、被测线材的正数据线、数据传输检测模块(4)、被测线材的负数据线连接构成数据检测回路以检测被测线材的数据传输线路的质量。8. A USB charging cable detection device according to claim 1, characterized in that: it also includes a data transmission detection module (4), and the data transmission detection module (4) can be electrically connected to the other end of the wire to be tested , and the power supply module (1), the positive data line of the tested wire, the data transmission detection module (4), and the negative data line of the tested wire are connected to form a data detection circuit to detect the quality of the data transmission line of the tested wire. 9.根据权利要求8所述的一种USB充电线检测装置，其特征在于：所述数据传输检测模块(4)包括第二负载(41)以及第二电压表(42)，所述第二负载(41)的一端分别与第二电压表(42)的正极、被测线材的负数据线电连接，第二负载(41)的另一端分别与第二电压表(42)的负极、被测线材的正数据线电连接。9. A USB charging line detection device according to claim 8, characterized in that: the data transmission detection module (4) includes a second load (41) and a second voltmeter (42), the second One end of the load (41) is electrically connected to the positive pole of the second voltmeter (42) and the negative data line of the tested wire rod, and the other end of the second load (41) is respectively connected to the negative pole of the second voltmeter (42) and the negative data line of the tested wire. The positive data line of the test wire is electrically connected. 10.根据权利要求9所述的一种USB充电线检测装置，其特征在于：所述数据传输检测模块(4)还包括第三指示灯(43)以及第三限流电阻(44)，所述第三指示灯(43)的正极与第三限流电阻(44)的一端电连接，所述第三指示灯(43)的负极与第二负载(41)的一端电联接，所述第三限流电阻(44)的另一端与第二负载(41)的另一端电联接。10. A USB charging line detection device according to claim 9, characterized in that: the data transmission detection module (4) also includes a third indicator light (43) and a third current limiting resistor (44), so The positive pole of the third indicator light (43) is electrically connected to one end of the third current limiting resistor (44), the negative pole of the third indicator light (43) is electrically connected to one end of the second load (41), and the first The other end of the three current limiting resistors (44) is electrically connected with the other end of the second load (41).
CN201811020827.3A 2018-09-03 2018-09-03 USB charging wire detection device Pending CN109031004A (en)

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Application publication date: 20181218