CN204855625U - Voltage current detection tool of general type USB interface - Google Patents
Voltage current detection tool of general type USB interface Download PDFInfo
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- CN204855625U CN204855625U CN201520455602.6U CN201520455602U CN204855625U CN 204855625 U CN204855625 U CN 204855625U CN 201520455602 U CN201520455602 U CN 201520455602U CN 204855625 U CN204855625 U CN 204855625U
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Abstract
The utility model provides a voltage current detection tool of general type USB interface, including first voltmeter, second voltmeter, SW1 switch, SW2 switch, SW3 switch, SW5 switch, the public first interface of USB and comparator, the public first interface of USB includes VCC end, D+ end, D - end and GND end, the VCC end is connected with SW3 switch, SW5 switch, second voltmeter respectively, the D - end is connected with the SW1 switch, the SW1 switch is connected with the comparator, the D+ end is connected with the SW2 switch, the SW2 switch is connected with the comparator, the comparator is connected with first voltmeter, not GND termination ground. This voltage current detection tool of general type USB interface's appearance is small and exquisite, and simple structure can make things convenient for the voltage or the current value of accurate test USB output, has improved efficiency, has more made things convenient for producers' test.
Description
Technical field
The utility model relates to USB interface technical field, particularly relates to a kind of measure voltage & current tool of Universal USB interface.
Background technology
Along with the arrival of information society, the demand of people to electronic product is increasing, and have many electronic products to be all adopt USB interface to provide power supply at present, USB interface device category also gets more and more.Generally, the voltage export USB or electric current adopt special load machine to test, but expensive, the volume of load machine is also corresponding comparatively large, takes up an area large, be not easy to carry, and cost is high.
Utility model content
For above technical matters, the utility model provides a kind of measure voltage & current tool of Universal USB interface, low-profile, structure is simple, the voltage or current value of testing USB output terminal accurately can be facilitated, improve efficiency, the more convenient test of producers.
To this, the technical solution of the utility model is:
A measure voltage & current tool for Universal USB interface, comprises the first voltage table, the second voltage table, SW1 switch, SW2 switch, SW3 switch, SW5 switch, USB male joint interface and comparer; Described USB male joint interface comprises VCC end, D+ end, D-end and GND end, and described VCC end is connected with SW3 switch, SW5 switch, the second voltage table respectively; Described D-end is connected with SW1 switch, and described SW1 switch is connected with comparer; Described D+ end is connected with SW2 switch, and described SW2 switch is connected with comparer; Described comparer is connected with the first voltage table; Described GND holds ground connection.
As further improvement of the utility model, described VCC end is connected with SW3 switch, and described SW3 switch is connected with resistance R4, described resistance R4 ground connection; Described VCC end is connected with SW5 switch, and described SW5 switch is connected with resistance R5, described resistance R5 ground connection; Described resistance R4 is power-adjustable cement resistor.
As further improvement of the utility model, described resistance R4 is cement resistor, and resistance is 2.4 ohm.After making SW3 switch 5 connect like this, the electric current through this resistance R4 load is 2.1A.Resistance by regulating resistance R4 changes load current, thus whether the load capacity being convenient to detect the load voltage of detected USB interface output terminal and product is normal.
As further improvement of the utility model, described resistance R5 is 0 Ω.
As further improvement of the utility model, the material of described resistance R5 is iron wire.
As further improvement of the utility model, the model of described comparer is LM358.
As further improvement of the utility model, the D-end of described USB male joint interface is connected with SW1 switch, described SW1 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table.
As further improvement of the utility model, the D+ end of described USB male joint interface is connected with SW2 switch, described SW2 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table.
As further improvement of the utility model, the resistance of described resistance R1 and resistance R2 is 100 Ω, and the resistance of described resistance R3 is 1M Ω.
As further improvement of the utility model, the range of described first voltage table and the second voltage table is 10V.
Compared with prior art, the beneficial effects of the utility model are:
Adopt technology of the present utility model which is put, only need to adopt USB line to be connected with USB output terminal to be measured by described USB male joint interface, voltage, current data that USB output terminal to be measured exports can be tested out accurately, improve efficiency, facilitate the test of producers, and low-profile, structure is simple, be easy to carry, cost is low.
Accompanying drawing explanation
Fig. 1 is the external structure schematic diagram of a kind of embodiment of the utility model;
Fig. 2 is a kind of embodiment electrical block diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present utility model is described in further detail.
As depicted in figs. 1 and 2, a kind of measure voltage & current tool of Universal USB interface, comprises the first voltage table 1, second voltage table 2, SW1 switch 3, SW2 switch 4, SW3 switch 5, SW5 switch 6, USB male joint interface and comparer; The model of described comparer is LM358; Described USB male joint interface is connected with the USB interface of Devices to test; Described USB male joint interface comprises VCC end, D+ end, D-end and GND end, and described VCC end is connected with one end of SW3 switch 5, SW5 switch 6, second voltage table 2 respectively; Be specially, described VCC end is connected with SW3 switch 5, and described SW3 switch 5 is connected with resistance R4, described resistance R4 ground connection; Described VCC end is connected with SW5 switch 6, and described SW5 switch 6 is connected with resistance R5, described resistance R5 ground connection; Wherein, described resistance R4 is the resistance of movable detachable, is preferably the cement resistor of 2.4 ohm, and after making SW3 switch 5 connect like this, the electric current through this resistance R4 load is 2.1A; Also can adjust according to object to be measured, thus change the current value exported; Described resistance R5 is 0 Ω, and the material of described resistance R5 is preferably iron wire.
Described D-end is connected with SW1 switch, described SW1 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table 1.
Described D+ end is connected with SW2 switch, described SW2 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table 1.
The resistance of described resistance R1 and resistance R2 is preferably 100 Ω, and the resistance of described resistance R3 is preferably 1M Ω.
Described GND holds ground connection.
Described first voltage table 1 and the second voltage table 2 ground connection.The range of described first voltage table 1 and the second voltage table 2 is 10V.
As shown in Figure 1, described first voltage table 1, second voltage table 2, SW1 switch 3, SW2 switch 4, SW3 switch 5, SW5 switch 6 are all connected on the shell of the measure voltage & current tool of described Universal USB interface, are convenient to operate; Circuit part is located at the inside of the measure voltage & current tool of described Universal USB interface.
The function of SW1 switch 3: the voltage that general usb data D+ holds is 2.8V, the function of this switch is whether the voltage that detection usb data D-holds is normal, when switch is " ON " position, i.e. SW1 switch 3 conducting, circuit utilizes common emitter current comparator to be 0 amplification principle, the voltage of test input, export the first voltage table 1 to by the output terminal of comparer, voltage is shown as 2.8 ± 0.2V; When switch is " OFF " position and SW1 switch 3 not conducting, now the first voltage table 1 is shown as 4V.
The function of SW2 switch 4: general, the voltage that usb data D-holds is 2.1V, the function of this switch is whether the voltage that detection usb data D-holds is normal, when switch is " NO " position, i.e. SW2 switch 4 conducting, circuit utilizes common emitter current comparator to be the voltage of 0 amplification principle, test input, export the first voltage table 1 to by output terminal 1 or 7 pin of comparer, voltage is shown as 2.1 ± 0.2V; When switch is " OFF " position, i.e. SW2 switch 4 not conducting, the first voltage table 1 is shown as 4V.
The function of SW3 switch 5: the function of this switch is that simulation is when product is connected to mobile phone or other digital equipment, whether inspection USB output voltage current load ability is normal, according to Ohm law electric current I=voltage U/resistance R, want required electric current can regulate R4 resistance to realize; When switch is " ON " position, i.e. SW3 switch 5 conducting, whether the second voltage table 2 displayed value is 4.7 ~ 4.8V, and USB output voltage is connect the load of 2.3 Ω by the effect of this switch, be used for checking the load capacity of product normal; When switch is " OFF " position, i.e. SW3 switch 5 not conducting, the second voltage table 2 shows the output end voltage of Devices to test, is normally 5.1 ~ 5.2V.
The function of SW5 switch 6: be mainly stopping and return 0, the function of this switch is whether simulation product protection function when output short-circuit is normal, when switch is " ON " position, i.e. SW5 switch 6 conducting, the second voltage table 2 is shown as 0V; Effect is by USB output voltage, directly uses iron wire shorted to earth, sees circuit whether self-protecting; When switch is " OFF ", i.e. SW5 switch 6 not conducting, the second voltage table 2 shows 5.1V.
The measure voltage & current tool of described a kind of Universal USB interface is mainly used in the electric current and voltage test of the output terminal of regular handset charger, 5V switch power source adapter, apple charger device, massage bed or onboard charger etc.
Adopt the USB port end of the measure voltage & current tool of described Universal USB interface to massage bed control box to test below, method of operating is as follows:
(1) the measure voltage & current tool internal switch power supply of described a kind of Universal USB interface exports, and the second voltage table 2 shows 5V; USB male joint interface connects required testing apparatus;
(2) USB male joint interface is inserted the USB port of massage bed control box; This interface can be apple and Android mobile phone charging USB interface;
(3) press SW3 switch 5, i.e. SW3 switch 5 conducting, the displayed value of the second voltage table 2 have dropped 0.4V by 5V; When unclamping SW3 switch 5, i.e. SW3 switch 5 not conducting, the second voltage table 2 is shown as 5.1V again;
Whether the load capacity that this keypress function mainly detects 5V power supply reaches requirement; Wherein load can from Row sum-equal matrix, to verify self size of current;
(4) press SW5 switch 6 and maintain 1 second, be i.e. SW5 switch 6 conducting, the voltage of the second voltage table 2 is shown as 0V; When unclamping SW5 switch 6, i.e. SW5 switch 6 not conducting, the second voltage table 2 is shown as 5.1V; Whether the overload protection function that the function of this button mainly detects power supply is normal;
(5) press SW1 switch 3, i.e. SW1 switch 3 conducting, the first voltage table 1 shows 2.1V ± 0.2V; When unclamping SW1 switch 3, i.e. SW1 switch 3 not conducting, the first voltage table 1 shows 4V;
(6) press SW2 switch 4, i.e. SW2 switch 4 conducting, the first voltage table 1 shows 2.8V+0V/-0.2V; When unclamping SW2 switch 4, i.e. SW2 switch 4 not conducting, the first voltage table 1 shows 4V;
By above-mentioned detection, the voltage of this massage bed control box exports normal, can normally use.
The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection domain of the present utility model.
Claims (10)
1. a measure voltage & current tool for Universal USB interface, is characterized in that: comprise the first voltage table, the second voltage table, SW1 switch, SW2 switch, SW3 switch, SW5 switch, USB male joint interface and comparer; Described USB male joint interface comprises VCC end, D+ end, D-end and GND end, and described VCC end is connected with SW3 switch, SW5 switch, the second voltage table respectively; Described D-end is connected with SW1 switch, and described SW1 switch is connected with comparer; Described D+ end is connected with SW2 switch, and described SW2 switch is connected with comparer; Described comparer is connected with the first voltage table; Described GND holds ground connection.
2. the measure voltage & current tool of Universal USB interface according to claim 1, is characterized in that: described VCC end is connected with SW3 switch, and described SW3 switch is connected with resistance R4, described resistance R4 ground connection; Described VCC end is connected with SW5 switch, and described SW5 switch is connected with resistance R5, described resistance R5 ground connection; Described resistance R4 is power-adjustable cement resistor.
3. the measure voltage & current tool of Universal USB interface according to claim 2, is characterized in that: described resistance R4 is cement resistor, and resistance is 2.4 ohm.
4. the measure voltage & current tool of Universal USB interface according to claim 2, is characterized in that: described resistance R5 is 0 Ω.
5. the measure voltage & current tool of Universal USB interface according to claim 4, is characterized in that: the material of described resistance R5 is iron wire.
6. the measure voltage & current tool of Universal USB interface according to claim 2, is characterized in that: the model of described comparer is LM358.
7. the measure voltage & current tool of Universal USB interface according to claim 6, it is characterized in that: the D-end of described USB male joint interface is connected with SW1 switch, described SW1 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table.
8. the measure voltage & current tool of Universal USB interface according to claim 6, it is characterized in that: the D+ end of described USB male joint interface is connected with SW2 switch, described SW2 switch is connected with resistance R1, resistance R3 respectively, described resistance R1 is connected with the positive input terminal of comparer, the negative input end of described comparer is connected with resistance R2, described resistance R2 is connected with the output terminal of described comparer, and the output terminal of described comparer is connected with the first voltage table.
9. the measure voltage & current tool of the Universal USB interface according to claim 7 or 8, is characterized in that: the resistance of described resistance R1 and resistance R2 is 100 Ω, and the resistance of described resistance R3 is 1M Ω.
10. the measure voltage & current tool of the Universal USB interface according to claim 1 ~ 8 any one, is characterized in that: the range of described first voltage table and the second voltage table is 10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520455602.6U CN204855625U (en) | 2015-06-29 | 2015-06-29 | Voltage current detection tool of general type USB interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520455602.6U CN204855625U (en) | 2015-06-29 | 2015-06-29 | Voltage current detection tool of general type USB interface |
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| Publication Number | Publication Date |
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| CN204855625U true CN204855625U (en) | 2015-12-09 |
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| CN201520455602.6U Expired - Fee Related CN204855625U (en) | 2015-06-29 | 2015-06-29 | Voltage current detection tool of general type USB interface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891594A (en) * | 2016-05-16 | 2016-08-24 | 上海市共进通信技术有限公司 | Cement resistor-based USB test load and test load construction method |
| CN106597153A (en) * | 2016-12-08 | 2017-04-26 | 英业达科技有限公司 | Jig for detecting adapter |
| CN107247179A (en) * | 2017-05-03 | 2017-10-13 | 北京世纪龙脉科技有限公司 | A kind of voltage detecting circuit of USB device |
| CN109425758A (en) * | 2017-08-23 | 2019-03-05 | 广州灿能电子科技有限公司 | A kind of USB power source plate detection fixture |
-
2015
- 2015-06-29 CN CN201520455602.6U patent/CN204855625U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891594A (en) * | 2016-05-16 | 2016-08-24 | 上海市共进通信技术有限公司 | Cement resistor-based USB test load and test load construction method |
| CN106597153A (en) * | 2016-12-08 | 2017-04-26 | 英业达科技有限公司 | Jig for detecting adapter |
| CN107247179A (en) * | 2017-05-03 | 2017-10-13 | 北京世纪龙脉科技有限公司 | A kind of voltage detecting circuit of USB device |
| CN109425758A (en) * | 2017-08-23 | 2019-03-05 | 广州灿能电子科技有限公司 | A kind of USB power source plate detection fixture |
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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: 20151209 Termination date: 20190629 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |