CN206908272U - A kind of vehicle-mounted USB interface short-circuit protection circuit - Google Patents
A kind of vehicle-mounted USB interface short-circuit protection circuit Download PDFInfo
- Publication number
- CN206908272U CN206908272U CN201720876642.7U CN201720876642U CN206908272U CN 206908272 U CN206908272 U CN 206908272U CN 201720876642 U CN201720876642 U CN 201720876642U CN 206908272 U CN206908272 U CN 206908272U
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- semiconductor
- oxide
- metal
- main road
- usb interface
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Abstract
It the utility model is related to a kind of vehicle-mounted USB interface short-circuit protection circuit,Including diode D1,Main road metal-oxide-semiconductor Q1,Control metal-oxide-semiconductor Q2,Resistance R1,R2 and R3 and electric capacity C1,Diode D1 positive pole connects the+5V inputs of USB interface,Negative pole connects main road metal-oxide-semiconductor Q1 source electrode,It is grounded after main road metal-oxide-semiconductor Q1 grid series resistor R3,Drain electrode connects+5V outputs,Control metal-oxide-semiconductor Q2 source electrode is connected to the node between diode D1 negative pole and main road metal-oxide-semiconductor Q1 source electrode,Drain electrode is connected to the node between main road metal-oxide-semiconductor Q1 grid and resistance R3,Grid series resistor R1 is followed by the node between the drain electrode to main road metal-oxide-semiconductor Q1 and+5V outputs,It is serially connected in after resistance R2 and electric capacity C1 parallel connections between control metal-oxide-semiconductor Q2 source electrode and grid,The main road metal-oxide-semiconductor Q1 and control metal-oxide-semiconductor Q2 is p-type metal-oxide-semiconductor.The utility model has circuit simple, and cost is low, and securely and reliably, temperature resistant range is wide and the advantages that long lifespan.
Description
Technical field
It the utility model is related to a kind of vehicle-mounted USB interface short-circuit protection circuit.
Background technology
Existing vehicle-mounted increasing people can use vehicle-mounted usb interfaces to charge, such as the equipment such as mobile phone, flat board, extraneous
Using causing, interface protection is more and more important, and generally interface is protected using resettable fuse herein, but resettable fuse is deposited
In multifactor impacts such as temperature, life-spans, drawback is shown all the more.
Chinese utility model CN205489434U discloses a kind of vehicle-mounted USB power source short-circuit protection circuit, and it includes first
NMOS tube, the second NMOS tube, the first counnter attack diode, the second counnter attack diode, light emitting diode, the first electric capacity, the second electric capacity,
First resistor, second resistance, 3rd resistor and voltage comparator.The electric circuit electronics technical device is more, and circuit is relative complex, cost compared with
It is high.
The content of the invention
The purpose of this utility model is to provide a kind of low cost, the simply vehicle-mounted USB interface short-circuit protection circuit of circuit.For
This, the concrete technical scheme that the utility model uses is as follows：
A kind of vehicle-mounted USB interface short-circuit protection circuit, it is characterised in that including diode D1, main road metal-oxide-semiconductor Q1, control
Metal-oxide-semiconductor Q2, resistance R1, R2 and R3 and electric capacity C1, diode D1 positive pole connect the+5V inputs of USB interface, and negative pole connects main road
Metal-oxide-semiconductor Q1 source electrode, it is grounded after main road metal-oxide-semiconductor Q1 grid series resistor R3, drain electrode connects+5V outputs, control metal-oxide-semiconductor Q2 source
Pole is connected to the node between diode D1 negative pole and main road metal-oxide-semiconductor Q1 source electrode, drain electrode be connected to main road metal-oxide-semiconductor Q1 grid with
Node between resistance R3, grid series resistor R1 are followed by the node between the drain electrode to main road metal-oxide-semiconductor Q1 and+5V outputs, electricity
It is serially connected in after resistance R2 and electric capacity C1 parallel connections between control metal-oxide-semiconductor Q2 source electrode and grid, the main road metal-oxide-semiconductor Q1 and control MOS
Pipe Q2 is p-type metal-oxide-semiconductor.
Further, the main road metal-oxide-semiconductor Q1 and control metal-oxide-semiconductor Q2 model AP3401.
The utility model uses above-mentioned technical proposal, has an advantageous effect in that, the utility model has that circuit is simple, into
This is low, and securely and reliably, temperature resistant range is wide and the advantages that long lifespan.
Brief description of the drawings
Fig. 1 is the circuit diagram of the vehicle-mounted USB interface short-circuit protection circuit of the utility model embodiment.
Embodiment
To further illustrate each embodiment, the utility model is provided with accompanying drawing.These accompanying drawings are in the utility model discloses
A part for appearance, it can coordinate the associated description of specification to explain the running of embodiment original mainly to illustrate embodiment
Reason.Cooperation refers to these contents, and those of ordinary skill in the art will be understood that other possible embodiments and this practicality are new
The advantages of type.
The utility model is further illustrated in conjunction with the drawings and specific embodiments.Fig. 1 is the utility model embodiment
Vehicle-mounted USB interface short-circuit protection circuit circuit diagram.Vehicle-mounted USB interface short-circuit protection circuit may include diode D1, main road
Metal-oxide-semiconductor Q1, control metal-oxide-semiconductor Q2, resistance R1, R2 and R3 and electric capacity C1.Wherein, diode D1 positive pole meets the+5V of USB interface
5V_IN (i.e.+5V outputs of power supply) is inputted, negative pole connects main road metal-oxide-semiconductor Q1 source electrode, main road metal-oxide-semiconductor Q1 grid concatenation
It is grounded after resistance R3, drain electrode connects the+5V outputs of USB interface, and control metal-oxide-semiconductor Q2 source electrode is connected to diode D1 negative pole and main road
Node between metal-oxide-semiconductor Q1 source electrode, drain electrode are connected to the node between main road metal-oxide-semiconductor Q1 grid and resistance R3, grid concatenation
Resistance R1 is followed by the node between the drain electrode to main road metal-oxide-semiconductor Q1 and+5V outputs, and control is serially connected in after resistance R2 and electric capacity C1 parallel connections
Between metal-oxide-semiconductor Q2 processed source electrode and grid.The main road metal-oxide-semiconductor Q1 and control metal-oxide-semiconductor Q2 is p-type metal-oxide-semiconductor.
Preferably, the main road metal-oxide-semiconductor Q1 and control metal-oxide-semiconductor Q2 model AP3401.
It is briefly described as follows circuit operation principle of the present utility model.When working properly, metal-oxide-semiconductor Q2 is controlled to close
Close, main road metal-oxide-semiconductor Q1 is opened, and+5V inputs 5V_IN and turned on+5V outputs 5V_OUT, and USB interface power supply is normal.As extraneous OUT
When abnormal short-circuit, voltage die to 0V, control metal-oxide-semiconductor Q2 is opened, and control main road metal-oxide-semiconductor Q1 is closed ,+5V input 5V_IN and+5V
Export 5V_OUT to disconnect, the power supply of USB interface is protected.Control metal-oxide-semiconductor Q2 monitors OUT voltages in real time, when short circuit solves
Except when, USB interface recover normal work.
Although specifically showing and describing the utility model with reference to preferred embodiment, those skilled in the art should
This is understood, is not departing from the spirit and scope of the present utility model that appended claims are limited, in form and details
On the utility model can be made a variety of changes, be the scope of protection of the utility model.
Claims (2)
1. a kind of vehicle-mounted USB interface short-circuit protection circuit, it is serially connected in+5V the inputs and+5V outputs of USB interface, its feature exists
In, including diode D1, main road metal-oxide-semiconductor Q1, control metal-oxide-semiconductor Q2, resistance R1, R2 and R3 and electric capacity C1, diode D1 is just
Pole connects the+5V inputs of USB interface, and negative pole connects main road metal-oxide-semiconductor Q1 source electrode, and main road metal-oxide-semiconductor Q1 grid series resistor R3 is followed by
Ground, drain electrode connect+5V outputs, and control metal-oxide-semiconductor Q2 source electrode is connected between diode D1 negative pole and main road metal-oxide-semiconductor Q1 source electrode
Node, drain electrode are connected to the node between main road metal-oxide-semiconductor Q1 grid and resistance R3, and grid series resistor R1 is followed by main road MOS
Control metal-oxide-semiconductor Q2 source electrode and grid are serially connected in after node between pipe Q1 drain electrode and+5V outputs, resistance R2 and electric capacity C1 parallel connections
Between pole, the main road metal-oxide-semiconductor Q1 and control metal-oxide-semiconductor Q2 are p-type metal-oxide-semiconductor.
2. vehicle-mounted USB interface short-circuit protection circuit as claimed in claim 1, it is characterised in that the main road metal-oxide-semiconductor Q1 and control
Metal-oxide-semiconductor Q2 processed model AP3401.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720876642.7U CN206908272U (en) | 2017-07-19 | 2017-07-19 | A kind of vehicle-mounted USB interface short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720876642.7U CN206908272U (en) | 2017-07-19 | 2017-07-19 | A kind of vehicle-mounted USB interface short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206908272U true CN206908272U (en) | 2018-01-19 |
Family
ID=61311876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720876642.7U Expired - Fee Related CN206908272U (en) | 2017-07-19 | 2017-07-19 | A kind of vehicle-mounted USB interface short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206908272U (en) |
-
2017
- 2017-07-19 CN CN201720876642.7U patent/CN206908272U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180119 Termination date: 20200719 |
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| CF01 | Termination of patent right due to non-payment of annual fee |