CN204008905U - USB interface measurement jig - Google Patents
USB interface measurement jig Download PDFInfo
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- CN204008905U CN204008905U CN201420409110.9U CN201420409110U CN204008905U CN 204008905 U CN204008905 U CN 204008905U CN 201420409110 U CN201420409110 U CN 201420409110U CN 204008905 U CN204008905 U CN 204008905U
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Abstract
The utility model provides a kind of USB interface measurement jig, it is for testing a USB main equipment, and USB main equipment is provided with multiple USB interface, described USB interface measurement jig comprises some USB test interfaces and some test modules, described USB test interface is electrically connected to respectively described USB interface, and described USB test interface comprises power input and earth terminal; Described test module is electrically connected respectively described USB test interface, and described test module comprises test voltage circuit, excess current artifical resistance and switch, wherein test voltage circuit is connected between power input and earth terminal, the first end of excess current artifical resistance connects power input, the first end of the second end connecting valve of excess current artifical resistance, the second end of switch connects earth terminal; And in all test modules, the first end of switch is electrically connected.
Description
Technical field
The utility model relates to a kind of USB interface measurement jig, particularly a kind of USB interface measurement jig that improves testing efficiency.
Background technology
USB interface, because supporting hot plug, compatible good, not high of cost, is subject to the welcome of PC manufacturer for many years always, has become the standard configuration expansion interface on computer main board.USB device is divided into HOST(main equipment) and SLAVE(from equipment), only have the transmission that could realize data in the time that a HOST is connected with a SLAVE.The output voltage of the USB interface on computer is direct current 5V, and output current is not more than 500 milliamperes.In USB current supply circuit, there is capacitor filtering, insurance resistance, current limliting IC or power power-supply pipe, this design can ensure that each USB interface of mainboard provides the supply current of maximum 500MA to peripheral hardware, simultaneously in the time of peripheral hardware short circuit, current limliting IC can cut off the power supply of USB interface automatically, ensures the normal stable work of main frame.
Before shipment, need USB interface to test, whether have electricity shortage or defect that cannot overcurrent protection to test USB interface.Test for the first time: in test loop,, without excess current artifical resistance, supply voltage is exported whether reach+5V; Test for the second time: have excess current artifical resistance in test loop, whether reach+5V of supply voltage output.But existing measurement jig need be tested respectively each USB interface, cannot improve testing efficiency.
Summary of the invention
Fundamental purpose of the present utility model is to provide a kind of USB interface measurement jig that improves testing efficiency.
The utility model provides a kind of USB interface measurement jig, and it is for testing a USB main equipment, and USB main equipment is provided with multiple USB interface, and described USB interface measurement jig comprises:
Some USB test interfaces, it is electrically connected to respectively described USB interface, and described USB test interface comprises power input and earth terminal;
Some test modules, it is electrically connected respectively described USB test interface, and described test module comprises test voltage circuit, excess current artifical resistance and switch, wherein test voltage circuit is connected between power input and earth terminal, the first end of excess current artifical resistance connects power input, the first end of the second end connecting valve of excess current artifical resistance, the second end of switch connects earth terminal; And in all test modules, the first end of switch is electrically connected.
Especially, described test voltage circuit comprises the first resistance, the second resistance, the 3rd resistance, transistor AND gate pilot lamp, the first end of the first resistance connects power input, the second end of the first resistance connects first end and the transistorized G utmost point of the second resistance, the second end of the second resistance connects earth terminal, the 3rd resistance and pilot lamp are connected in series in power input and the transistorized D utmost point, and the transistorized S utmost point connects earth terminal.
Compared with prior art, the utility model USB interface measurement jig is electrically connected respectively described USB test interface by some test modules, switch in closed arbitrary test module can be realized between excess current artifical resistance in all test modules and the USB interface of docking and form closed-loop path, and no longer need single test module to distinguish switching over, improve production efficiency.
Brief description of the drawings
Fig. 1 is the constitutional diagram of the utility model USB interface measurement jig when without excess current artifical resistance.
Fig. 2 is the constitutional diagram of the utility model USB interface measurement jig in the time having excess current artifical resistance.
Embodiment
Refer to shown in Fig. 1, the utility model provides a kind of USB interface measurement jig, and it is for testing a USB main equipment, and USB main equipment is provided with multiple USB interface (not shown), and described USB interface measurement jig comprises:
Some USB test interface (not shown), it is electrically connected to respectively described USB interface, and described USB test interface comprises power input and earth terminal;
Some test modules 10, it is electrically connected respectively described USB test interface, and described test module 10 comprises test voltage circuit 11, excess current artifical resistance 12 and switch 13, wherein test voltage circuit 11 is connected between power input and earth terminal, the first end of excess current artifical resistance 12 connects power input, the first end of the second end connecting valve of excess current artifical resistance 12, the second end of switch 13 connects earth terminal; And in all test modules 10, the first end of switch 13 is electrically connected.
In the present embodiment, described test voltage circuit 11 comprises the first resistance 111, the second resistance 112, the 3rd resistance 113, transistor 115 and pilot lamp 114, the first end of the first resistance 111 connects power input, the second end of the first resistance 111 connects the first end of the second resistance 112 and the G utmost point of transistor 115, the second end of the second resistance 112 connects earth terminal, the 3rd resistance 113 and pilot lamp 114 are connected in series in the D utmost point of power input and transistor 115, and the S utmost point of transistor 115 connects earth terminal.The setting parameter of test voltage circuit 11 need meet following requirement: suppose the resistance R1 of the first resistance 111, and the resistance R2 of the second resistance 112, the voltage of power input is U, the resistance R0 of excess current artifical resistance 12.
Switch 13 in all test modules 10 disconnects, the excess current artifical resistance 12 in all test modules 10 is in off state, the voltage that the G of transistor 115 gets on is extremely U1=U*R2/ (R1+R2), in the time of U=5V, the large I of U1 makes transistor 115 keep conducting state, now, the 3rd resistance 113, transistor 115 form galvanic circle with pilot lamp 114, and pilot lamp 114 is luminous normal with prompting testing staff supply voltage; And in the time of U < 5V, the size of U1 makes transistor 115 remain open state, now, the 3rd resistance 113, transistor 115 form and open circuit with pilot lamp 114, and pilot lamp 114 is not luminous abnormal with prompting testing staff supply voltage.
Refer to shown in Fig. 2, switch 13 in closed arbitrary test module 10, between excess current artifical resistance 12 in all test modules 10 and the USB interface of docking, form closed-loop path, electric current I=U/R0 in test module 10, now, total current on test module 10 exceeds the output-current rating of USB interface, if the circuit overcurrent protection in USB main equipment is normal, the power supply of the instantaneous trip USB interface that can occur in excess current, , U < 5V, now, the 3rd resistance 113, transistor 115 forms and opens circuit with pilot lamp 114, pilot lamp 114 is not luminous normal with prompting testing staff circuit overcurrent protection, otherwise, if the circuit overcurrent protection in USB main equipment is abnormal, the moment that can occur in excess current is not cut off the power supply of USB interface,, U=5V, the 3rd resistance 113, transistor 115 form galvanic circle with pilot lamp 114, and pilot lamp 114 is luminous abnormal with prompting testing staff circuit overcurrent protection.
The utility model USB interface measurement jig is electrically connected respectively described USB test interface by some test modules, switch in closed arbitrary test module can be realized between excess current artifical resistance in all test modules and the USB interface of docking and form closed-loop path, and no longer need single test module to distinguish switching over, improve production efficiency.
The above; it is only embodiment of the present utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (2)
1. a USB interface measurement jig, it is for testing a USB main equipment, and USB main equipment is provided with multiple USB interface, it is characterized in that comprising:
Some USB test interfaces, it is electrically connected to respectively described USB interface, and described USB test interface comprises power input and earth terminal;
Some test modules, it is electrically connected respectively described USB test interface, and described test module comprises test voltage circuit, excess current artifical resistance and switch, wherein test voltage circuit is connected between power input and earth terminal, the first end of excess current artifical resistance connects power input, the first end of the second end connecting valve of excess current artifical resistance, the second end of switch connects earth terminal; And in all test modules, the first end of switch is electrically connected.
2. USB interface measurement jig according to claim 1, it is characterized in that: described test voltage circuit comprises the first resistance, the second resistance, the 3rd resistance, transistor AND gate pilot lamp, the first end of the first resistance connects power input, the second end of the first resistance connects first end and the transistorized G utmost point of the second resistance, the second end of the second resistance connects earth terminal, the 3rd resistance and pilot lamp are connected in series in power input and the transistorized D utmost point, and the transistorized S utmost point connects earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409110.9U CN204008905U (en) | 2014-07-23 | 2014-07-23 | USB interface measurement jig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409110.9U CN204008905U (en) | 2014-07-23 | 2014-07-23 | USB interface measurement jig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204008905U true CN204008905U (en) | 2014-12-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420409110.9U Expired - Fee Related CN204008905U (en) | 2014-07-23 | 2014-07-23 | USB interface measurement jig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204008905U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502773A (en) * | 2015-01-06 | 2015-04-08 | 东莞华贝电子科技有限公司 | Jig and method for detecting short circuit protection function of mobile terminal |
| CN110118911A (en) * | 2018-12-28 | 2019-08-13 | 贸联电子(昆山)有限公司 | USBC cable test circuit |
| CN111796147A (en) * | 2020-07-15 | 2020-10-20 | 苏州聚点智能科技有限公司 | USB interface test module |
-
2014
- 2014-07-23 CN CN201420409110.9U patent/CN204008905U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502773A (en) * | 2015-01-06 | 2015-04-08 | 东莞华贝电子科技有限公司 | Jig and method for detecting short circuit protection function of mobile terminal |
| CN110118911A (en) * | 2018-12-28 | 2019-08-13 | 贸联电子(昆山)有限公司 | USBC cable test circuit |
| CN111796147A (en) * | 2020-07-15 | 2020-10-20 | 苏州聚点智能科技有限公司 | USB interface test module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160723 |