CN203929949U - A kind of Intelligent Measurement USB interface load capacity device - Google Patents
A kind of Intelligent Measurement USB interface load capacity device Download PDFInfo
- Publication number
- CN203929949U CN203929949U CN201420365223.3U CN201420365223U CN203929949U CN 203929949 U CN203929949 U CN 203929949U CN 201420365223 U CN201420365223 U CN 201420365223U CN 203929949 U CN203929949 U CN 203929949U
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- China
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- usb interface
- load capacity
- slide rheostat
- intelligent measurement
- current measuring
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Abstract
The utility model discloses a kind of Intelligent Measurement USB interface load capacity device, described device comprises slide rheostat and current measuring device, after wherein slide rheostat is connected with current measuring device, then connect respectively the VCC of USB interface and GND end, form a current measurement circuit.The technology that adopts the utility model to provide, can detect the load capacity of the USB interface of mainboard more accurately, make to measure more accurate and visual, easy to detect, save test resource.
Description
Technical field
The utility model relates to USB interface technical field, is specifically related to a kind of Intelligent Measurement USB interface load capacity device.
Background technology
Along with the arrival of information society, people are increasing to the demand of computer product, and USB interface device category is also more and more.And the load capacity of the USB interface of every kind of computing machine is different, the USB interface that load capacity is good can drive more USB device, and the poor USB interface of load capacity will be very poor to the compatibility of the equipment of USB.Because the load capacity of USB interface can not allow you see intuitively, so when load compatibility issue appears in USB interface, we are difficult to provide intuitively answer.Therefore develop the device of the detection USB interface load capacity of a intelligence, by this device, can provide intuitively the size of the load capacity of USB interface.
Summary of the invention
The technical problems to be solved in the utility model is: the purpose of this utility model is just to provide a kind of Intelligent Measurement USB interface load capacity device.
The technical scheme that the utility model adopts is:
A kind of Intelligent Measurement USB interface load capacity device, described device comprises slide rheostat and current measuring device, after wherein slide rheostat is connected with current measuring device, the VCC and the GND end that connect respectively again USB interface, be connected to the both positive and negative polarity of USB interface, form a current measurement circuit.
According to USB standard, the output current maximal value of USB interface is 500mA, therefore at the power supply two ends of USB interface, connect an adjustable slide rheostat, change rheostatic resistance, along with diminishing of resistance value, the both end voltage of slide rheostat can be stabilized to a definite value, after stablizing, just stops changing and slides.The electric current that now flows through resistance is exactly the maximum load capability of this interface.
In order to be convenient for measuring, described device also comprises a USB plug, and VCC and GND that described device is connected to USB interface by USB plug hold.During use, USB plug is inserted to interface, facilitate circuit to connect.
In described current measurement circuit, also comprise a bleeder circuit.Avoid burning slide rheostat because of overtension.
Current measuring device can be voltage table, can be also reometer, and while using voltage table, voltage table is in parallel with slide rheostat, and then, by the voltage of measuring, the resistance divided by slide rheostat, draws electric current.
For the purpose of convenient, described current measuring device is reometer, after connecting, is connected to USB interface with slide rheostat, can directly obtain current value.
Described current measuring device comprises analog to digital conversion circuit part, single chip part and LED display section, wherein:
Analog to digital conversion circuit part is carried out dividing potential drop slide rheostat two ends, and by modulus conversion chip, the magnitude of voltage of simulation is converted to digital voltage and be transported on single-chip microcomputer;
Single chip part, the main functions such as collection, conversion, storage, processing and I/O of being responsible for data, it through receiving, calculate, latch (frequency division, selection), decoding, finally delivers to LED display section the data that obtain from modulus conversion chip output;
Display section comprises processing section and the periphery circuit part that is integrated in single-chip microcomputer inside;
The both end voltage of slide resistor is after bleeder circuit dividing potential drop, pass to modulus conversion chip, the analog voltage that modulus conversion chip is come biography converts digital voltage to, then the digital voltage after conversion is passed to single-chip microcomputer, single-chip microcomputer is receiving to such an extent that digital voltage converts through calculating the actual current that flows through slide rheostat to, and process latchs, decoding is transferred to display section.
The beneficial effects of the utility model are: the technology that adopts the utility model to provide, can detect more accurately the load capacity of the USB interface of mainboard, make to measure more accurate and visual, easy to detect, save test resource.
Accompanying drawing explanation
Fig. 1 is the utility model electrical block diagram.
Embodiment
With reference to the accompanying drawings, by embodiment, the utility model is further illustrated:
Embodiment 1:
A kind of Intelligent Measurement USB interface load capacity device, described device comprises slide rheostat 2 and current measuring device 3, after wherein slide rheostat 2 is connected with current measuring device 3, the VCC and the GND end that connect respectively again usb 1, be connected to the both positive and negative polarity of usb 1, form a current measurement circuit.
Embodiment 2:
On the basis of embodiment 1, in order to be convenient for measuring, described device also comprises a USB plug, and VCC and GND that described device is connected to usb 1 by USB plug hold.During use, USB plug is inserted to interface, facilitate circuit to connect.
Embodiment 3:
On the basis of embodiment 1 or 2, in described current measurement circuit, also comprise a bleeder circuit, can be a divider resistance 4, avoid burning slide rheostat because of overtension.
Embodiment 4:
On the basis of embodiment 1 or 2, described current measuring device 3 is reometer, after connecting, is connected to usb 1 with slide rheostat, can directly obtain current value.
Embodiment 4:
On the basis of embodiment 1 or 2, described current measuring device comprises analog to digital conversion circuit part, single chip part and LED display section, wherein:
Analog to digital conversion circuit part is carried out dividing potential drop slide rheostat two ends, and by modulus conversion chip, the magnitude of voltage of simulation is converted to digital voltage and be transported on single-chip microcomputer;
Single chip part is mainly responsible for the functions such as collection, conversion, storage, processing and I/O of data, it through receiving, calculate, latch (frequency division, selection), decoding, finally delivers to LED display section the data that obtain from modulus conversion chip output;
Display section comprises processing section and the periphery circuit part that is integrated in single-chip microcomputer inside;
The both end voltage of slide resistor is after bleeder circuit dividing potential drop, pass to modulus conversion chip, the analog voltage that modulus conversion chip is come biography converts digital voltage to, then the digital voltage after conversion is passed to single-chip microcomputer, single-chip microcomputer is receiving to such an extent that digital voltage converts through calculating the actual current that flows through slide rheostat to, and process latchs, decoding is transferred to display section.
Claims (5)
1. an Intelligent Measurement USB interface load capacity device, it is characterized in that: described device comprises slide rheostat and current measuring device, after wherein slide rheostat is connected with current measuring device, then connect respectively the VCC of USB interface and GND end, form a current measurement circuit.
2. a kind of Intelligent Measurement USB interface load capacity device according to claim 1, is characterized in that: described device also comprises a USB plug, and VCC and GND that described device is connected to USB interface by USB plug hold.
3. a kind of Intelligent Measurement USB interface load capacity device according to claim 1 and 2, is characterized in that: in described current measurement circuit, also comprise a bleeder circuit.
4. a kind of Intelligent Measurement USB interface load capacity device according to claim 3, is characterized in that: described current measuring device is reometer, after connecting, is connected to USB interface with slide rheostat.
5. a kind of Intelligent Measurement USB interface load capacity device according to claim 3, is characterized in that: described current measuring device comprises analog to digital conversion circuit part, single chip part and LED display section, wherein:
Analog to digital conversion circuit part is carried out dividing potential drop slide rheostat two ends, and by modulus conversion chip, the magnitude of voltage of simulation is converted to digital voltage and be transported on single-chip microcomputer;
The data that single chip part handle obtains from modulus conversion chip output are passed through and are received, calculate, latch, decoding, finally deliver to LED display section;
Display section comprises processing section and the periphery circuit part that is integrated in single-chip microcomputer inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365223.3U CN203929949U (en) | 2014-07-03 | 2014-07-03 | A kind of Intelligent Measurement USB interface load capacity device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420365223.3U CN203929949U (en) | 2014-07-03 | 2014-07-03 | A kind of Intelligent Measurement USB interface load capacity device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203929949U true CN203929949U (en) | 2014-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420365223.3U Expired - Fee Related CN203929949U (en) | 2014-07-03 | 2014-07-03 | A kind of Intelligent Measurement USB interface load capacity device |
Country Status (1)
| Country | Link |
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| CN (1) | CN203929949U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103761174A (en) * | 2014-01-21 | 2014-04-30 | 浪潮电子信息产业股份有限公司 | Design method of marginal test for memory signals in start-up process |
| CN106154083A (en) * | 2016-06-20 | 2016-11-23 | 西可通信技术设备（河源）有限公司 | A kind of USB interface load testing device |
-
2014
- 2014-07-03 CN CN201420365223.3U patent/CN203929949U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103761174A (en) * | 2014-01-21 | 2014-04-30 | 浪潮电子信息产业股份有限公司 | Design method of marginal test for memory signals in start-up process |
| CN106154083A (en) * | 2016-06-20 | 2016-11-23 | 西可通信技术设备（河源）有限公司 | A kind of USB interface load testing device |
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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 |
Granted publication date: 20141105 Termination date: 20150703 |
|
| EXPY | Termination of patent right or utility model |