CN101566871A - USB protection device - Google Patents
USB protection device Download PDFInfo
- Publication number
- CN101566871A CN101566871A CNA2009101069836A CN200910106983A CN101566871A CN 101566871 A CN101566871 A CN 101566871A CN A2009101069836 A CNA2009101069836 A CN A2009101069836A CN 200910106983 A CN200910106983 A CN 200910106983A CN 101566871 A CN101566871 A CN 101566871A
- Authority
- CN
- China
- Prior art keywords
- usb
- triode
- resistance
- importation
- protective device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002775 capsule Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
The invention discloses a USB protection device, comprising a power supply, an input part and an output part, wherein a control part is between the input part and the output part and the control part is connected with the +5V power supply pin of the input part, comprising a Zener diode ZD, a triode Q1 connected with the Zener diode ZD by a first resistance R1, and an one-way controllable silicon VT connected with the triode Q1. The mobile storage device and the document in the mobile storage device are effectively prevented from being damaged by combining the series voltage-stabilization theory composed of the triode Q1 and the Zener diode ZD with the current control theory of the one-way controllable silicon VT with simple structure and low cost.
Description
[technical field]
The present invention relates to the USB technical field, particularly a kind of USB protective device.
[background technology]
Present various forms of USB movable storage device generally uses in people's live and work, but the use and maintenance aspect of various USB movable storage devices is ignored by people usually, causes the damage of movable storage device easily owing to reasons such as misoperation or power supply static.Not only bring economically loss, the more important thing is that losing of some capsule information can be given in work or the life to bring irremediable heavy losses to us.Chinese patent the 200720027026.0th discloses a kind of USB holding circuit, and it includes USB interface, power supply and over-current detection control circuit, and this over-current detection control circuit includes a power management chip and a processor.The input end of power management chip connects power supply; output terminal connects the power pins of USB interface; when surpassing setting value, passes through output end current its fault-signal end output fault-signal to described processor when detecting; the switch controlling signal output pin of this processor connects the switch control end of power management chip; the control power management chip turn-offs the output of its output terminal when receiving fault-signal, thereby reaches the effect of protection USB device.Yet this method needs components and parts such as power management chip, processor, the circuit structure complexity, and cost is higher.
[summary of the invention]
For addressing the above problem, it is a kind of simple in structure that fundamental purpose of the present invention is to provide, the USB protective device that cost is low.
For achieving the above object, technical scheme of the present invention is:
A kind of USB protective device; include power supply, importation and output; wherein be connected with control section between importation and the output; described control section connects importation+5V power pins, and it includes voltage stabilizing diode ZD, the triode Q1 that links to each other with voltage stabilizing diode ZD by first resistance R 1 and the one-way SCR VT that is connected with triode Q1.
Compared to prior art; USB protective device of the present invention adopts the triode Q1 and the series connection principle of stabilized voltage of voltage stabilizing diode ZD composition and the Current Control principle of one-way SCR VT to combine; effectively protection movable storage device itself and data wherein are not damaged, and simple in structure, cost is low.
[description of drawings]
Fig. 1 is a USB protective device schematic block circuit diagram of the present invention.
[embodiment]
A kind of USB protective device of the present invention adopts the triode Q1 and the series connection principle of stabilized voltage of voltage stabilizing diode ZD composition and the Current Control principle of one-way SCR VT to combine; when the importation overtension or when unusual electrostatic pulse is arranged; control section can be controlled and protect; cut off the output power path, thereby effectively protect movable storage device itself and data wherein not to be damaged.
See also shown in Figure 1, the output that a kind of USB protective device of the present invention includes power supply (not shown), importation, the control section that is connected with the importation and connects control section.Described importation is a USB plug, is used to insert the USB socket of televisor; And described output is the USB socket, is used for inserting for USB flash disk.Wherein, control section connect the importation+the 5V power pins, it includes voltage stabilizing diode ZD, the triode Q1 that links to each other with voltage stabilizing diode ZD by first resistance R 1 and the one-way SCR VT that is connected with triode Q1.The base stage of triode Q1 connects first resistance R 1, and collector is connected with one second resistance R 2, and collector also connects the control utmost point G of one-way SCR VT simultaneously; And the grounded emitter of triode Q1.The grid K of controllable silicon VT is connected to USB output terminal+5V pin, and the grid K of controllable silicon VT also is connected with LED simultaneously, and LED is by one the 3rd resistance R 3 ground connection.In addition, the importation+the 5V power supply also is connected to second resistance R, 2 one ends, and the anode A of controllable silicon VT.
Under the normal condition, the supply voltage of USB movable storage device is between 3.5V to 6V.When input voltage just often (is 3.5V to 6V), its electric current directly passes through anode A and the grid K of one-way SCR VT, output normal voltage (3.5V to 6V) is for the work of USB movable storage device, at this moment, LED and the 3rd resistance R 3 have the voltage source mistake, form the loop over the ground, the LED lamp is bright, and expression USB movable storage device is working properly; And when input voltage surpassed normal power supply voltage 6V, voltage stabilizing diode ZD began the avalanche breakdown conducting, and its electric current is by after the current limliting step-down of first resistance R 1, to the base stage of triode Q1.The grounded emitter of triode Q1, and the collector order is to the control utmost point G of controllable silicon VT.When the voltage of triode Q1 base stage during greater than its dead band voltage; the conducting of triode Q1 positively biased; when its collector voltage quickly falls to the operating voltage of the control utmost point G that can not keep one-way SCR VT; one-way SCR VT is in the characteristic of ending and cuts off current path between single-phase silicon-controlled anode A and the grid K; at this moment; one-way SCR VT ends; its grid K no-output voltage; thereby cut off the voltage of USB movable storage device; play the overvoltage protection effect; make that the USB movable storage device can be because of input voltage surpass normal power supply voltage 6V, and be damaged.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (5)
1. USB protective device; include power supply, importation and output; it is characterized in that: be connected with control section between importation and the output; described control section connects importation+5V power pins, and it includes voltage stabilizing diode (ZD), by continuous triode (Q1) of first resistance (R1) and voltage stabilizing diode (ZD) and the one-way SCR (VT) that is connected with triode (Q1).
2. USB protective device as claimed in claim 1 is characterized in that: the base stage of described triode (Q1) connects first resistance (R1), and collector is connected with one second resistance (R2), and collector also connects the control utmost point (G) of one-way SCR (VT) simultaneously; And the grounded emitter of triode (Q1).
3. USB protective device as claimed in claim 2; it is characterized in that: the grid (K) of described controllable silicon (VT) be connected to the USB output terminal+the 5V pin; the grid (K) of controllable silicon (VT) also is connected with light emitting diode (LED) simultaneously, and light emitting diode (LED) is by one the 3rd resistance (R3) ground connection.
4. USB protective device as claimed in claim 3 is characterized in that: described importation+the 5V power supply also is connected to second resistance (R2) end, and the anode (A) of controllable silicon (VT).
5. USB protective device as claimed in claim 4 is characterized in that: described importation is a USB plug, is used to insert the USB socket of televisor; And described output is the USB socket, is used for inserting for USB flash disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101069836A CN101566871B (en) | 2009-05-15 | 2009-05-15 | USB protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101069836A CN101566871B (en) | 2009-05-15 | 2009-05-15 | USB protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101566871A true CN101566871A (en) | 2009-10-28 |
| CN101566871B CN101566871B (en) | 2011-01-05 |
Family
ID=41283058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101069836A Expired - Fee Related CN101566871B (en) | 2009-05-15 | 2009-05-15 | USB protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101566871B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515923A (en) * | 2012-06-19 | 2014-01-15 | 三星电子株式会社 | Interface unit having overcurrent and overvoltage protection device |
| CN104735873A (en) * | 2015-03-18 | 2015-06-24 | 深圳市锦兴流明科技有限公司 | Switching circuit and lamp compatible with fluorescent lamp ballast |
| WO2017185200A1 (en) * | 2016-04-25 | 2017-11-02 | 深圳市瑞耐斯技术有限公司 | Interface protection circuit for movable storage device, and movable storage device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375021Y (en) * | 1999-05-28 | 2000-04-19 | 董世荣 | Overvoltage safety protector for electrical appliances |
| CN2750618Y (en) * | 2004-06-12 | 2006-01-04 | 中兴通讯股份有限公司 | An electrostatic discharge protection structure for USB interface |
| CN2772067Y (en) * | 2005-03-14 | 2006-04-12 | 联想(北京)有限公司 | Universal serial bus interface electrostatic protective circuit and device |
| CN101242090A (en) * | 2007-02-08 | 2008-08-13 | 鸿富锦精密工业（深圳）有限公司 | Over-voltage protector |
-
2009
- 2009-05-15 CN CN2009101069836A patent/CN101566871B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515923A (en) * | 2012-06-19 | 2014-01-15 | 三星电子株式会社 | Interface unit having overcurrent and overvoltage protection device |
| CN103515923B (en) * | 2012-06-19 | 2018-10-19 | 惠普打印机韩国有限公司 | Interface unit with overcurrent and overvoltage protecting device |
| CN104735873A (en) * | 2015-03-18 | 2015-06-24 | 深圳市锦兴流明科技有限公司 | Switching circuit and lamp compatible with fluorescent lamp ballast |
| CN104735873B (en) * | 2015-03-18 | 2017-08-18 | 深圳市锦兴流明科技有限公司 | A kind of change-over circuit and lamp of compatible fluorescent lamp ballast |
| WO2017185200A1 (en) * | 2016-04-25 | 2017-11-02 | 深圳市瑞耐斯技术有限公司 | Interface protection circuit for movable storage device, and movable storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101566871B (en) | 2011-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING FINANCIAL ASSETS EXCHANGE CO., LTD. Free format text: FORMER OWNER: SHENZHEN SKYWORTH-RGB ELECTRONIC CO., LTD. Effective date: 20111231 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518057 SHENZHEN, GUANGDONG PROVINCE TO: 100032 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20111231 Address after: 100032 No. 17, Finance Street, Beijing, Xicheng District Patentee after: Beijing financial assets Bats Exchange Inc Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A13-16 Patentee before: Shenzhen Skyworth-RGB Electronics Co., Ltd. |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing financial assets Bats Exchange Inc Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: Ren Lian Document name: Notice of termination of patent |
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| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20200515 |
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| CF01 | Termination of patent right due to non-payment of annual fee |