CN207184027U - A kind of USB interface is to vehicle power short-circuit protection circuit - Google Patents
A kind of USB interface is to vehicle power short-circuit protection circuit Download PDFInfo
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- CN207184027U CN207184027U CN201721011844.1U CN201721011844U CN207184027U CN 207184027 U CN207184027 U CN 207184027U CN 201721011844 U CN201721011844 U CN 201721011844U CN 207184027 U CN207184027 U CN 207184027U
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- usb interface
- vehicle power
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Abstract
A kind of USB interface be the utility model is related to vehicle power short-circuit protection circuit; it is arranged between USB power supplies IC output end and USB interface input; including detection circuit and feedback action circuit; the input of the detection circuit is connected between the USB interface input and the motional feedback circuit, and the motional feedback circuit also includes the on-off circuit of connection and enabled circuit；The enabled input of the on-off circuit is connected by enabling circuit with the output end of the detection circuit.The beneficial effect that USB interface of the present utility model is played to vehicle power short-circuit protection circuit includes：1st, the utility model solve thes problems, such as that infringement power supply IC occurs in vehicle-mounted USB power supply ends short circuit on-vehicle battery.2nd, the utility model ensure that can recover normal condition automatically after short circuit removal, it is not necessary to the control logic and its interlock circuit of additional complexity.
Description
Technical field
Vehicle electronic circuit protection field is the utility model is related to, more particularly to a kind of USB interface is to vehicle power short-circuit protection
Circuit.
Background technology
In current vehicle-mounted USB interface, the power supply of USB interface is typically all to be provided by the power supply IC of main circuit, due to
Vehicle-mounted USB some is directly installed on before console main system of audio, and some USB are then drawn out to behind main system of audio with USB line
Other positions, as hand by case, glove compartment, plus USB interface connection be external equipment, interface is exposed, if USB power
Power end short circuit on-vehicle battery in the case of accident, USB power supply IC damages are may result in very much greatly so as to cause USB functions can not
Use, the use of a USB interface protection circuit is necessary for main system of audio for this risk.
The content of the invention
The utility model is in order to solve the above-mentioned technical problem, there is provided a kind of USB interface is to vehicle power short-circuit protection electricity
Road.
For a kind of USB interface to vehicle power short-circuit protection circuit, output end and the USB interface for being arranged on USB power supplies IC are defeated
Between entering end, including detection circuit and feedback action circuit, the input of the detection circuit connect the USB interface input
Between end and the motional feedback circuit, the motional feedback circuit also includes the on-off circuit of connection and enabled circuit；Institute
The enabled input for stating on-off circuit is connected by enabling circuit with the output end of the detection circuit.
Further, the enabled circuit includes first resistor and triode, and the transistor base connects the inspection
Slowdown monitoring circuit output end, colelctor electrode connect the enabled input and access driving electricity of the on-off circuit by the first resistor
Source.Also include second resistance, the second resistance is connected between the driving power and the first resistor.The driving electricity
Source is 8V dc source.
In addition, the on-off circuit includes metal-oxide-semiconductor, the source electrode connection USB power supplies IC of metal-oxide-semiconductor output end, drain electrode
USB interface input is connected, grid is enabled input.
Further, the detection circuit includes voltage-stabiliser tube, 3rd resistor and the 4th resistance, and the voltage-stabiliser tube positive pole leads to
The 3rd resistor and the 4th resistance eutral grounding of series connection are crossed, negative pole connects the USB interface input, the 3rd resistor and the 4th electricity
Node between resistance is also connected with the enabled circuit.
Preferably, in addition to the first electric capacity and the second electric capacity, the first electric capacity one end ground connection, the other end are connected to institute
State the base stage of triode.Second electric capacity one end ground connection, the other end are connected to the grid of the metal-oxide-semiconductor.
The beneficial effect that USB interface of the present utility model is played to vehicle power short-circuit protection circuit includes：
1st, the utility model efficiently solves vehicle-mounted USB power supply ends short circuit on-vehicle battery and occurs damaging asking for power supply IC
Topic.
2nd, the utility model ensure that can recover normal condition automatically after short circuit removal, it is not necessary to the control of additional complexity
Logic processed and its interlock circuit.
Brief description of the drawings
Fig. 1 is the circuit access system schematic diagram in the utility model embodiment 1.
Fig. 2 is the architecture principle figure in the utility model embodiment 1.
Fig. 3 is the circuit theory diagrams in the utility model embodiment 2.
Wherein, it is 10 to detect circuit；Feedback action circuit is 20；Enabled circuit is 21；On-off circuit is 22；Vehicle-mounted USB
The output end for IC chip of powering is POW_IN；Vehicle-mounted USB power supply interfaces are POW_OUT；Metal-oxide-semiconductor is Q1；Triode is Q2；Voltage stabilizing
Manage as D1；First resistor is R1；Second resistance is R2；3rd resistor is R3；4th resistance is R4；First electric capacity is C1；Second
Electric capacity is C2.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model
It is more easy to be readily appreciated by one skilled in the art with feature, so as to make the scope of protection of the utility model apparent define.
Embodiment 1：
A kind of USB interface is to vehicle power short-circuit protection circuit, as shown in figure 1, being arranged on vehicle-mounted USB power supplies IC chip
Between output end POW_IN and vehicle-mounted USB power supply interfaces POW_OUT, for carrying out short-circuit guarantor to power supply IC in interface short circuit
Shield.It is specific to include detection circuit 10 and feedback action circuit 20, wherein detection circuit 10 is used to detect whether circuit 10 goes out
Existing short-circuit conditions, and feedback action circuit 20 then switches off and on according to the testing result of detection circuit 10 to circuit realiration.
As shown in Fig. 2 between the input connection USB interface input and motional feedback circuit of detection circuit 10, exported for gathering
The magnitude of voltage of voltage.And motional feedback circuit includes the on-off circuit 22 and enabled circuit 21 of connection, on-off circuit 22 includes
Input, output end and enabled input, wherein input and the single USB of the connection respectively power supply IC of output and USB interface, make
Energy input is connected by enabling circuit 21 with detecting the output end of circuit 10.Enabled circuit 21 is then defeated according to detection circuit 10
The magnitude of voltage gone out decides whether that no on-off circuit 22 sends the enable signal of shut-off.When circuit occurs short-circuit, the output of circuit
Voltage can be more than normal value, reach the magnitude of voltage 12V of on-vehicle battery, now detect circuit 10 and detect short circuit, as enabling circuit
21 send the signal for needing to turn off, and then enable the enable signal that circuit 21 sends breaking circuit to on-off circuit 22, switch electricity
Road 22 turns off to circuit, plays a protective role.
Embodiment 2：
As the further optimization of embodiment 1, the present embodiment and the difference of embodiment 1 are：As shown in figure 3, this implementation
In example, enabled circuit 21 includes first resistor R1, second resistance R2 and triode Q2, triode Q2 base stage connection detection circuit
10 output ends, colelctor electrode connect the enabled input and access driving power of on-off circuit 22, emitter stage by first resistor R1
Ground connection.Second resistance R2 is connected between driving power and first resistor R1.Driving power is 8V dc source.
In addition, on-off circuit 22 includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 source electrode connection USB power supplies IC output end, drain electrode connects
USB interface input is connect, grid is enabled input.
Lead at the aspect of detection circuit 10, including voltage-stabiliser tube D1,3rd resistor R3 and the 4th resistance R4, voltage-stabiliser tube D1 positive poles
Cross 3rd resistor R3 and the 4th resistance the R4 ground connection of series connection, negative pole connection USB interface input, 3rd resistor R3 and the 4th resistance
Node between R4 is also connected with enabled circuit 21.3rd resistor R3 and the 4th resistance R4 play a part of partial pressure, can pass through tune
Whole 3rd resistor R3 and the 4th resistance R4 resistance and the resistance value ratio between it, to reach the effect of adjustment critical voltage.This
In embodiment, voltage-stabiliser tube D1 pincers pressure value is 5.6V, and it will conducting after magnitude of voltage is more than 5V.
Influenceed to reduce circuit noise, further comprises Dolby circuit, that includes the first electric capacity C1 and the second electric capacity
C2, first electric capacity C1 one end ground connection, the other end are connected to triode Q2 base stage.Second electric capacity C2 one end is grounded, and the other end connects
It is connected on metal-oxide-semiconductor Q1 grid.
In circuit normal work, because voltage-stabiliser tube D1 ends so that triode Q2 ends, so as to which driving voltage will add
On metal-oxide-semiconductor Q1Q1 grid, now grid voltage has exceeded conducting critical voltage, metal-oxide-semiconductor Q1 conductings, its be equivalent to one it is non-
Often small resistance.When external-connected port is to on-vehicle battery short circuit, that is, 12V is accessed, now detect circuit 10 and start working, voltage-stabiliser tube
D1 is turned on, and so as to cause triode Q2Q2 base stages to produce electric current, and then makes the saturation conduction state of Q2 entrance, now metal-oxide-semiconductor Q1
Grid be pulled low, enter off state so as to metal-oxide-semiconductor Q1, the 12V for avoiding on-vehicle battery enters USB and powered IC output
End, therefore USB power supply IC are protected, otherwise when on-vehicle battery short circuit removes, the protection circuit can be returned to automatically normally
Working condition.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to
Above-mentioned embodiment, in those of ordinary skill in the art's possessed knowledge, the utility model can also not departed from
Various changes can be made on the premise of objective.
Claims (8)
1. a kind of USB interface, to vehicle power short-circuit protection circuit, the output end for being arranged on USB power supplies IC inputs with USB interface
Between end, it is characterised in that including detection circuit and feedback action circuit, described in the input connection of the detection circuit
Between USB interface input and the motional feedback circuit, the motional feedback circuit also include connection on-off circuit and
Enabled circuit；The enabled input of the on-off circuit is connected by enabling circuit with the output end of the detection circuit.
2. USB interface according to claim 1 is to vehicle power short-circuit protection circuit, it is characterised in that the enabled electricity
Road includes first resistor and triode, and the transistor base connects the detection circuit output end, and colelctor electrode passes through described
First resistor connects the enabled input and access driving power of the on-off circuit, grounded emitter.
3. USB interface according to claim 2 is to vehicle power short-circuit protection circuit, it is characterised in that also including second
Resistance, the second resistance are connected between the driving power and the first resistor.
4. USB interface according to claim 2 is to vehicle power short-circuit protection circuit, it is characterised in that the driving electricity
Source is 8V dc source.
5. the USB interface according to any one of claim 1 ~ 4 is to vehicle power short-circuit protection circuit, it is characterised in that
The on-off circuit includes metal-oxide-semiconductor, and the source electrode connection USB power supplies IC of metal-oxide-semiconductor output end, it is defeated that drain electrode connects USB interface
Enter end, grid is enabled input.
6. USB interface according to claim 1 is to vehicle power short-circuit protection circuit, it is characterised in that the detection electricity
Road includes voltage-stabiliser tube, 3rd resistor and the 4th resistance, the 3rd resistor and the 4th resistance that the voltage-stabiliser tube positive pole passes through series connection
Ground connection, negative pole connect the USB interface input, and the node between the 3rd resistor and the 4th resistance is also connected with described enabled
Circuit.
7. USB interface according to claim 2 is to vehicle power short-circuit protection circuit, it is characterised in that also including first
Electric capacity, the first electric capacity one end ground connection, the other end are connected to the base stage of the triode.
8. USB interface according to claim 5 is to vehicle power short-circuit protection circuit, it is characterised in that also including second
Electric capacity, the second electric capacity one end ground connection, the other end are connected to the grid of the metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721011844.1U CN207184027U (en) | 2017-08-14 | 2017-08-14 | A kind of USB interface is to vehicle power short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721011844.1U CN207184027U (en) | 2017-08-14 | 2017-08-14 | A kind of USB interface is to vehicle power short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207184027U true CN207184027U (en) | 2018-04-03 |
Family
ID=61740847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721011844.1U Active CN207184027U (en) | 2017-08-14 | 2017-08-14 | A kind of USB interface is to vehicle power short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207184027U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712159A (en) * | 2018-05-03 | 2018-10-26 | 福建科立讯通信有限公司 | A kind of the igniting start-up circuit and method of Vehicle mounted station |
| TWI736190B (en) * | 2020-03-23 | 2021-08-11 | 瑞昱半導體股份有限公司 | Usb signal output circuit and operation method thereof having reverse current prevention mechanism |
-
2017
- 2017-08-14 CN CN201721011844.1U patent/CN207184027U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712159A (en) * | 2018-05-03 | 2018-10-26 | 福建科立讯通信有限公司 | A kind of the igniting start-up circuit and method of Vehicle mounted station |
| CN108712159B (en) * | 2018-05-03 | 2023-11-28 | 福建科立讯通信有限公司 | Ignition starting circuit and method for vehicle-mounted platform |
| TWI736190B (en) * | 2020-03-23 | 2021-08-11 | 瑞昱半導體股份有限公司 | Usb signal output circuit and operation method thereof having reverse current prevention mechanism |
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