CN203233167U - USB flash disk with lightning-protection function - Google Patents
USB flash disk with lightning-protection function Download PDFInfo
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- CN203233167U CN203233167U CN 201320261628 CN201320261628U CN203233167U CN 203233167 U CN203233167 U CN 203233167U CN 201320261628 CN201320261628 CN 201320261628 CN 201320261628 U CN201320261628 U CN 201320261628U CN 203233167 U CN203233167 U CN 203233167U
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- usb flash
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Abstract
The utility model discloses a USB flash disk with a lightning-protection function, and the USB flash disk comprises a USB interface which is connected with a lightning-protection circuit. The lightning-protection circuit comprises a diode D2, a diode D3, a Zener diode D4, a resistor R4, and a field effect transistor. The positive electrode of the diode D2 is connected with the negative electrode of the diode D3, and the negative electrode of the diode D2 is connected with the negative electrode of the Zener diode D4 and also connected with a VDD. The positive electrode of the diode D3 is connected with the positive electrode of the Zener diode D4 and also grounded. One terminal of the resistor R4 is connected to the positive electrode of the diode D2, and the other terminal of resistor R4 is connected to the drain electrode of the field effect transistor. The grid electrode and the source electrode of the field effect transistor are connected with each other and also grounded. The USB flash disk is advantageous in that the USB interface of the USB flash disk is connected with the lightning-protection circuit, which makes the USB flash disk have the lightning-protection function. Moreover, the lightning-protection circuit has a simple structure and is convenient to integrate inside the USB flash disk, which does not bring a burden to the cost of the USB flash disk.
Description
Technical field
The utility model relates to a kind of USB flash disk, relates to a kind of USB flash disk with lightning protected function in particular.
Background technology
USB flash disk is as the instrument of people for storage picture, data, image store or exchanges data, and it seems more and more important.Because the volume of USB flash disk is less, its internal circuit is difficult for too complicated, so general USB flash disk does not have the lightning protection function.At ordinary times, though thunder and lightning can not threaten to USB flash disk,, because USB flash disk is directly to be connected on computer or other electronic equipments by USB interface, forget after USB flash disk uses and pull up that it is easy to be subjected to the invasion and attack of thunder and lightning, especially in thunderstorm in summer multiple season.After thunder and lightning damages the internal circuit of USB flash disk, the data of USB flash disk storage inside can't be found or lose, bring the certain economic loss to the people, especially concerning those preserve the USB flash disk of capsule information.
The utility model content
The utility model provides a kind of USB flash disk with lightning protected function, and its USB interface place at USB flash disk is connected with lightning protected circuit, make USB flash disk have the lightning protection function, and this circuit structure is simple, is convenient to be integrated in USB flash disk inside.
For solving above-mentioned technical problem, the utility model by the following technical solutions:
A kind of USB flash disk with lightning protected function; it comprises USB interface; be connected with lightning protected circuit on the described USB interface; described lightning protected circuit comprises diode D2; diode D3; voltage stabilizing didoe D4; resistance R 4 and field effect transistor; the positive pole of described diode D2 is connected on the negative pole of diode D3; the negative pole of described diode D2 links to each other with the negative pole of voltage stabilizing didoe D4 and is connected on the VDD simultaneously; the positive pole of described diode D3 links to each other with the positive pole of voltage stabilizing didoe D4 and while ground connection; one end of described resistance R 4 is connected on the positive pole of diode D2; resistance R 4 other ends are connected in the drain electrode of field effect transistor, and the grid of described field effect transistor links to each other with source electrode and while ground connection.
In the utility model, lightning protected circuit comprises three diodes, a resistance and a field effect transistor, and its circuit structure is simple, be convenient to be integrated in the USB flash disk, and it is too complicated can not make USB flash disk get circuit structure.When thunder and lightning acted on the USB flash disk, diode D2, diode D3 and the thunder and lightning of voltage stabilizing didoe D4 provided many paths of releasing.Resistance R 4 and field effect transistor provide the second class protection circuit; when diode D2, diode D3 and voltage stabilizing didoe D4 do not release thunder and lightning when complete; resistance R 4 and field effect transistor are carried out secondary to thunder and lightning and are released, and thunder and lightning is released fully, avoid thunder and lightning that the responsive electronic devices and components in the USB flash disk are damaged.Resistance R 4 also plays metering function, avoids that circuit is much to damage USB flash disk.
Further technical scheme is:
Also be connected with surge protection circuit on the described lightning protected electricity; described surge protection circuit comprises variable resistor R1; resistance R 2; resistance R 3; diode D1 and comparator; two inputs of described comparator are connected to the two ends of resistance R 2; the two ends of described resistance R 2 link to each other with the end of variable resistor R1 and the negative pole of diode D1 respectively; the other end of described variable resistor R1 is connected on the positive pole of diode D1 and ground connection simultaneously; the collector electrode of described triode links to each other with the positive pole of diode D2 and an end of resistance R 3 simultaneously; the other end of described resistance R 3 is connected between variable resistor R1 and the resistance R 2 and is connected on the VDD grounded emitter of described triode simultaneously.
The Standard resistance range of described resistance R 4 is 3500 ohm-4000 ohm.
Because USB flash disk can produce surge when computer or the connection of other equipment, it also is great that surge destroys the USB flash disk internal circuit.Diode D1 produces the reference voltage of comparator, when surge is done the time spent, variable resistor R1 dividing potential drop is input to comparator, comparator detect voltage when excessive output signal open triode, with the transistor collector current drain, prevent from internal circuit is impacted, to avoid surge the USB flash disk internal circuit is damaged.
Compared with prior art, the beneficial effects of the utility model are:
1, the utility model is connected with lightning protected circuit at the USB interface place of USB flash disk, makes USB flash disk have the lightning protection function, can avoid thunder and lightning that the USB flash disk internal circuit is damaged, with protection people's significant data information.
2, circuit structure of the present utility model is simple, is convenient to be integrated in USB flash disk inside, and the electronic devices and components of selecting for use are cheap, can not bring great burden to the cost of USB flash disk, is fit to large-scale production.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Execution mode of the present utility model includes but not limited to the following example.
[embodiment]
A kind of USB flash disk with lightning protected function as shown in Figure 1; it comprises USB interface; be connected with lightning protected circuit on the described USB interface; described lightning protected circuit comprises diode D2; diode D3; voltage stabilizing didoe D4; resistance R 4 and field effect transistor; the positive pole of described diode D2 is connected on the negative pole of diode D3; the negative pole of described diode D2 links to each other with the negative pole of voltage stabilizing didoe D4 and is connected on the VDD simultaneously; the positive pole of described diode D3 links to each other with the positive pole of voltage stabilizing didoe D4 and while ground connection; one end of described resistance R 4 is connected on the positive pole of diode D2; resistance R 4 other ends are connected in the drain electrode of field effect transistor, and the grid of described field effect transistor links to each other with source electrode and while ground connection.
Also be connected with surge protection circuit on the described lightning protected electricity; described surge protection circuit comprises variable resistor R1; resistance R 2; resistance R 3; diode D1 and comparator; two inputs of described comparator are connected to the two ends of resistance R 2; the two ends of described resistance R 2 link to each other with the end of variable resistor R1 and the negative pole of diode D1 respectively; the other end of described variable resistor R1 is connected on the positive pole of diode D1 and ground connection simultaneously; the collector electrode of described triode links to each other with the positive pole of diode D2 and an end of resistance R 3 simultaneously; the other end of described resistance R 3 is connected between variable resistor R1 and the resistance R 2 and is connected on the VDD grounded emitter of described triode simultaneously.
The Standard resistance range of described resistance R 4 is 3500 ohm-4000 ohm.
Be embodiment of the present utility model as mentioned above.The utility model is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.
Claims (3)
1. USB flash disk with lightning protected function; it comprises USB interface; it is characterized in that: be connected with lightning protected circuit on the described USB interface; described lightning protected circuit comprises diode D2; diode D3; voltage stabilizing didoe D4; resistance R 4 and field effect transistor; the positive pole of described diode D2 is connected on the negative pole of diode D3; the negative pole of described diode D2 links to each other with the negative pole of voltage stabilizing didoe D4 and is connected on the VDD simultaneously; the positive pole of described diode D3 links to each other with the positive pole of voltage stabilizing didoe D4 and while ground connection; one end of described resistance R 4 is connected on the positive pole of diode D2; resistance R 4 other ends are connected in the drain electrode of field effect transistor, and the grid of described field effect transistor links to each other with source electrode and while ground connection.
2. a kind of USB flash disk with lightning protected function according to claim 1; it is characterized in that: also be connected with surge protection circuit on the described lightning protected electricity; described surge protection circuit comprises variable resistor R1; resistance R 2; resistance R 3; diode D1 and comparator; two inputs of described comparator are connected to the two ends of resistance R 2; the two ends of described resistance R 2 link to each other with the end of variable resistor R1 and the negative pole of diode D1 respectively; the other end of described variable resistor R1 is connected on the positive pole of diode D1 and ground connection simultaneously; the collector electrode of described triode links to each other with the positive pole of diode D2 and an end of resistance R 3 simultaneously; the other end of described resistance R 3 is connected between variable resistor R1 and the resistance R 2 and is connected on the VDD grounded emitter of described triode simultaneously.
3. a kind of USB flash disk with lightning protected function according to claim 1, it is characterized in that: the Standard resistance range of described resistance R 4 is 3500 ohm-4000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320261628 CN203233167U (en) | 2013-05-15 | 2013-05-15 | USB flash disk with lightning-protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320261628 CN203233167U (en) | 2013-05-15 | 2013-05-15 | USB flash disk with lightning-protection function |
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| Publication Number | Publication Date |
|---|---|
| CN203233167U true CN203233167U (en) | 2013-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320261628 Expired - Fee Related CN203233167U (en) | 2013-05-15 | 2013-05-15 | USB flash disk with lightning-protection function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248034A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Lightning protection USB flash disk |
| CN103683243A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Refrigerator with surge protection function |
| CN105870904A (en) * | 2016-06-14 | 2016-08-17 | 四川福豆科技有限公司 | Cache server based on school co-education platform |
| CN107527601A (en) * | 2017-09-28 | 2017-12-29 | 深圳市华星光电技术有限公司 | The circuit overcurrent protection and method and liquid crystal display device of GOA circuits |
-
2013
- 2013-05-15 CN CN 201320261628 patent/CN203233167U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248034A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Lightning protection USB flash disk |
| CN103248034B (en) * | 2013-05-15 | 2015-08-12 | 成都市宏山科技有限公司 | Can the USB flash disk of lightning protection |
| CN103683243A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Refrigerator with surge protection function |
| CN105870904A (en) * | 2016-06-14 | 2016-08-17 | 四川福豆科技有限公司 | Cache server based on school co-education platform |
| CN107527601A (en) * | 2017-09-28 | 2017-12-29 | 深圳市华星光电技术有限公司 | The circuit overcurrent protection and method and liquid crystal display device of GOA circuits |
| CN107527601B (en) * | 2017-09-28 | 2020-01-31 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit and method of GOA circuit and liquid crystal display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20140515 |