CN207677423U - A kind of USB port output protection circuit and electronic equipment - Google Patents
A kind of USB port output protection circuit and electronic equipment Download PDFInfo
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- CN207677423U CN207677423U CN201721569823.1U CN201721569823U CN207677423U CN 207677423 U CN207677423 U CN 207677423U CN 201721569823 U CN201721569823 U CN 201721569823U CN 207677423 U CN207677423 U CN 207677423U
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Abstract
The utility model discloses a kind of USB port output protection circuit and electronic equipment, USB port output protection circuit, including load AM access module, access detection module and current detection module；The output end of load AM access module is separately connected the input terminal of the input terminal and current detection module of access detection module；Wherein, access detection module includes detection load end；Current detection module includes first switch pipe, detection resistance, current detecting end and circuit protection unit；The control terminal of first switch pipe is the control terminal of current detection module; the first end of first switch pipe is the input terminal of current detection module; one end of the second end connecting detection resistance of first switch pipe; the other end of detection resistance is grounded; the input terminal of the first end connection circuit protection unit of first switch pipe, the output end connection current detecting end of circuit protection unit.The USB port output protection circuit of the utility model embodiment effectively simplifies circuit using simple circuit structure, reduces circuit cost.
Description
Technical field
The utility model is related to electronic circuit technology field more particularly to a kind of USB port output protection circuits and electronics
Equipment.
Background technology
At present to realize safety and being protected to device, and also to meet LPS (Limited Power Supply)
It is required that, wherein LPS requires to want for one in IEC 60950-1 clause 2.5 (a kind of standard that IT classes power supply need to meet)
It asks, overcurrent and short-circuit protection mechanism generally can be all arranged in the circuit that mobile power equipment is externally exported by USB port.And it is existing
In technology, the discharge path of mobile power product frequently with circuit protection unit have：Battery core protection module, current limliting chip dies
Block, PTC (Positive Temperature Coefficient, posive temperature coefficient thermistor) module.
Wherein, battery core protection module is mainly used for the case where battery core overcurrent protection, over and additives for overcharge protection,
But on the mobile power of big specification output, such as specification is exported for 5V/2A+5V/1A or the mobile power of bigger, then requires
Battery core can export the electric current of bigger, and overcurrent value is often more than 8A, cannot be satisfied the 8A current limlitings requirement during LPS is required.Needle
To this situation, need additionally to increase current limliting chip module or PTC modules to meet LPS requirements, but which again increases hardware costs
Also reduce discharging efficiency.
Invention content
The purpose of this utility model is to provide a kind of USB port output protection circuit, can effectively solve existing scheme needs
Additional the problem of increasing protection module, reduces the discharging efficiency that circuit cost improves circuit.
To achieve the above object, the utility model embodiment provides a kind of USB port output protection circuit, including load
AM access module, access detection module and current detection module；The output end of the load AM access module is separately connected the access
The input terminal of the input terminal of detection module and the current detection module；Wherein,
The access detection module includes detection load end；
The current detection module includes first switch pipe, detection resistance, current detecting end and circuit protection unit；It is described
The control terminal of first switch pipe is the control terminal of the current detection module, and the first end of the first switch pipe is the electric current
The second end of the input terminal of detection module, the first switch pipe connects one end of the detection resistance, the detection resistance
The other end is grounded, and the first end of the first switch pipe connects the input terminal of the circuit protection unit, the circuit protection list
The output end of member connects the current detecting end.
Compared with prior art, USB port output protection circuit disclosed in the utility model embodiment is detected by accessing
Module completes the detection of load access, then the signal for obtaining load access is led to triggering the startup of corresponding current detection module
The current detection module for including first switch pipe, detection resistance and circuit protection unit is crossed, to realize USB port output protection electricity
The over-current detection and short-circuit protection of circuit in road, wherein first switch pipe is used to control the break-make of discharge circuit.The ends USB
Mouth output protection circuit is solved by the way of the multiplexing of first switch pipe to be needed additionally to increase protection mould in prior art
The problem of block, avoids the electric current mistake in short circuit further through the mode for the drain electrode that current detecting point is arranged to first switch pipe
The big risk for be easy to causeing component damage, simplifying circuit structure reduces circuit cost.
As the improvement of said program, the circuit protection unit includes capacitance, first resistor and the first zener diode；
One end of the capacitance and one end of the first resistor are collectively as the input terminal of the circuit protection unit, institute
The other end for stating capacitance is grounded, and the cathode of the other end of the first resistor and first zener diode is collectively as described
The output end of circuit protection unit, the plus earth of first zener diode.
As the improvement of said program, the load AM access module includes USB interface stand, power end, the second voltage stabilizing two
Pole pipe, second resistance and detection source input terminal；
The power input foot of the USB interface stand is separately connected one end of the power end and the second resistance, institute
The other end for stating second resistance connects the cathode of first Schottky diode, and the anode of first Schottky diode connects
Connect the detection source input terminal；Output end of the grounding leg of the USB interface stand as the load AM access module, wherein
The USB interface stand further includes data input pin and data output pin.
As the improvement of said program, the USB interface stand includes the first pin, second pin, third pin, the 4th
Pin, the 5th pin and the 6th pin, wherein the first pin is the power input foot, and the 4th pin is the grounding leg, the
Five pins and the 6th pin are connected to the 4th pin, collectively as the output end of the load AM access module；Second pin is
The data output pin, third pin are the data input pin.
As the improvement of said program, the detection resistance includes the first detection resistance and the second detection resistance, and described the
One end of one detection resistance and one end of second detection resistance are collectively as one end of the detection resistance, first inspection
The other end of the other end of measuring resistance and the other end of second detection resistance collectively as the detection resistance.
As the improvement of said program, the access detection module includes second switch pipe, 3rd resistor；
The control terminal of the second switch pipe and one end of the 3rd resistor are collectively as the access detection module
Input terminal, the other end of the 3rd resistor and the second end of the second switch pipe are grounded jointly, the second switch pipe
First end connects the detection load end.
As the improvement of said program, the second switch pipe is NMOS tube, the control terminal of the second switch pipe, first
End and second end correspond to grid, drain electrode and the source electrode of the NMOS tube respectively.
As the improvement of said program, the first switch pipe is NMOS tube, the control terminal of the first switch pipe, first
End and second end correspond to grid, drain electrode and the source electrode of the NMOS tube respectively.
Compared with prior art, USB port output protection circuit disclosed in the utility model embodiment, by including first
Switching tube, detection resistance, current detecting end and circuit protection unit current detection module, to realize USB port output protection
The over-current detection and short-circuit protection of circuit in circuit.The USB port output protection circuit uses the side of first switch pipe multiplexing
Formula solves the problems, such as to need in prior art additionally to increase protection module, and first is changed to further through by current detecting point
The mode of the drain electrode of switching tube avoids the excessive risk for be easy to causeing component damage of the electric current in short circuit, simplifies electricity
Line structure reduces circuit cost.
To achieve the above object, the utility model embodiment additionally provides a kind of electronic equipment comprising any reality as above
Apply the USB port output protection circuit disclosed in example.
Description of the drawings
Fig. 1 is the circuit theory schematic diagram of USB port output protection circuit in the utility model embodiment 1；
Fig. 2 is the circuit structure diagram of USB port output protection circuit in the utility model embodiment 2.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment 1
It is that the utility model embodiment 1 provides a kind of circuit theory signal of USB port output protection circuit referring to Fig. 1
Figure, including load AM access module 1, access detection module 2 and current detection module 3；The output end point of the load AM access module 1
The input terminal of the input terminal and the current detection module 3 for being inserted into detection module 2 is not connected；
The access detection module 2 includes detection load end CheckLoad；
The current detection module 3 includes first switch pipe U23, detection resistance R6, current detecting end CUREENT1 and electricity
Road protection location 31；The control terminal of the first switch pipe U23 is the control terminal of the current detection module 3, and described first opens
The first end for closing pipe U23 is the input terminal of the current detection module 3, described in the second end connection of the first switch pipe U23
The other end of one end of detection resistance R6, the detection resistance R6 is grounded, described in the first end connection of the first switch pipe U23
The output end of the input terminal of circuit protection unit 31, the circuit protection unit 31 connects the current detecting end CUREENT1.
Specifically, when the responsible AM access module 1 access USB loads, the grid of the second switch pipe Q1 will produce
The voltage that one amplitude is 1.5v~2.5v is formed negative so that the voltage of the detection load end CheckLoad is pulled low
Carry access signal.In practical situations, the controlling switch of the grid connection microcontroller of the first switch pipe U23, works as microcontroller
Then microcontroller control OTG pins make the first switch pipe U23 conductings discharge when receiving the load access signal.It is single
Piece machine by detect the current value of the detection resistance R6 come decision circuitry whether overcurrent or short circuit.When microcontroller detects circuit
When overcurrent or short circuit, then microcontroller controls the first switch pipe U23 shutdowns, to realize the purpose of protection circuit.
Further, traditional detection method works as circuit using the electric current for detecting the first switch pipe U23 source electrodes
When output short-circuit, microcontroller detects that circuit overcurrent then turns off the first switch pipe U23, but due to the output of USB port
It is directly coupled to the access detection module 2 so that the access detection module 2 in an ON state, causes the vacation of load insertion
As, therefore the first switch pipe U23 can be connected again, be discharged.It is periodically connected in the first switch pipe U23
During, electric current is very big when due to short circuit, can there is the risk of damage component.The present embodiment uses current detecting point
Method in the drain electrode of the first switch pipe U23 is set, and the current value that microcontroller is read when short circuit can exceed pre-
If threshold value then the first switch pipe U23 will not be switched on.When the electric current that microcontroller is read is in normal range (NR), monolithic
Machine just allows circuit to carry out the judgement of load insertion, so can be periodically connected to avoid the first switch pipe U23,
To play the role of protecting component.
USB port output protection circuit disclosed in the utility model embodiment, by including first switch pipe U23, detection
The current detection module 3 of resistance R6, current detecting end CUREENT1 and circuit protection unit 31, to realize that USB port output is protected
The over-current detection and short-circuit protection of circuit in protection circuit.The USB port output protection circuit is using the U23 multiplexings of first switch pipe
Mode solve the problems, such as to need additionally to increase protection module in prior art, meanwhile, by current detecting point setting exist
The mode of the drain electrode of first switch pipe U23 avoids the excessive risk for be easy to causeing component damage of the electric current in short circuit,
Simplifying circuit structure reduces circuit cost.
Embodiment 2
With reference to Fig. 2, the utility model embodiment 2 provides a kind of circuit structure diagram of USB port output protection circuit.It should
USB port output protection circuit includes load AM access module 1, access detection module 2 and current detection module 3；The load connects
The output end for entering module 1 is separately connected the input terminal of the input terminal and the current detection module 3 for accessing detection module 2；
Wherein,
The access detection module 2 includes detection load end CheckLoad；
The current detection module 3 includes first switch pipe U23, detection resistance R6, current detecting end CUREENT1 and electricity
Road protection location 31；The control terminal of the first switch pipe U23 is the control terminal of the current detection module 3, and described first opens
The first end for closing pipe U23 is the input terminal of the current detection module 3, described in the second end connection of the first switch pipe U23
The other end of one end of detection resistance R6, the detection resistance R6 is grounded, described in the first end connection of the first switch pipe U23
The output end of the input terminal of circuit protection unit 31, the circuit protection unit 31 connects the current detecting end CUREENT1.
Specifically, the circuit protection unit 31 includes capacitance C54, first resistor R295 and the first zener diode ZD3；
One end of the capacitance C54 and one end of the first resistor R295 are collectively as the circuit protection unit 31
Input terminal, the other end ground connection of the capacitance C54, the other end of the first resistor R295 and first zener diode
The cathode of ZD3 is collectively as the output end of the circuit protection unit 31, the plus earth of the first zener diode ZD3.
Further, the capacitance C54 is used for the detection filter of the current detecting end CUREENT1；First voltage stabilizing
Voltage excessive damage component when diode ZD3 is for preventing short circuit；The first resistor R295 is used for ESD
(Electro-Static discharge, Electro-static Driven Comb) is protected.
Specifically, the load AM access module 1 includes USB interface stand J5, power end USB_OUT, the first Schottky two
Pole pipe D8, second resistance R372 and detection source input terminal VCC_2V5；
The power input foot of the USB interface stand J5 is separately connected the power end USB_OUT and the second resistance
One end of R372, the other end of the second resistance R372 connect the cathode of the first Schottky diode D8, and described first
The anode of Schottky diode D8 connects the detection source input terminal VCC_2V5；The grounding leg conduct of the USB interface stand J5
The output end of the load AM access module 1, wherein the USB interface stand J5 further includes data input pin and data output pin.
Further, the first Schottky diode D8 is for preventing when the USB interface stand J5 is accessed and loaded
Electric current pours in down a chimney, and the second resistance R372 is used for the current-limiting protection when the USB interface stand J5 is accessed and loaded.
Specifically, the USB interface stand J5 include the first pin 1, second pin 2, third pin 3, the 4th pin 4,
5th pin 5 and the 6th pin 6, wherein first pin 1 is the power input foot, and the 4th pin 4 is the ground connection
Foot, the 5th pin 5 and the 6th pin 6 are connected to the 4th pin 4, collectively as the output end of the load AM access module 1；The
Two pins 2 are the data output pin, and third pin 3 is the data input pin.
Specifically, the detection resistance R6 includes the first detection resistance R61 and the second detection resistance R62, first inspection
One end of measuring resistance R61 and one end of the second detection resistance R62 collectively as the detection resistance R6 one end, described
The other end of the other end of one detection resistance R61 and the second detection resistance R62 are collectively as the another of the detection resistance R6
One end；Certainly, use the first detection resistance R61 and the second detection resistance R62 parallel connections as detection resistance R6's in the present embodiment
Mode is merely illustrative, in other embodiments, also exists by the way of constituting detection resistance R6 using the combining form of other resistance
Within the scope of protection of the utility model.
Specifically, the access detection module 2 includes second switch pipe Q1,3rd resistor R67；
Mould is detected in the control terminal of the second switch pipe Q1 and one end of the 3rd resistor R67 collectively as the access
The input terminal of block 2, the other end of the 3rd resistor R67 and the second end of the second switch pipe Q1 are grounded jointly, and described
The first end of two switching tube Q1 connects the detection load end CheckLoad.
Specifically, the second switch pipe Q1 is NMOS tube, control terminal, the first end and second of the second switch pipe Q1
End corresponds to grid, drain electrode and the source electrode of the NMOS tube respectively.
Specifically, the first switch pipe U23 is NMOS tube, the control terminal of the first switch pipe U23, first end and the
Two ends correspond to grid, drain electrode and the source electrode of the NMOS tube respectively.
Below to a kind of operation principle progress of the embodiment 2 of USB port output protection circuit provided by the utility model
Detailed description：
Under normal operating conditions, the anode of the first Schottky diode D8 connects the detection source input terminal VCC_
2V5, when the USB interface stand J5 does not access load, the first switch pipe U23 is off state；As the USB
When the J5 access USB loads of interface stand, under the action of the detection source input terminal VCC_2V5, the second switch pipe Q1's
Grid will produce the voltage that an amplitude is 1.5v~2.5v, then described at this time using the on state characteristic of the second switch pipe Q1
The Q1 conductings of second switch pipe form load access letter so that the voltage of the detection load end CheckLoad is pulled low
Number.In practical situations, the controlling switch of the grid connection microcontroller of the first switch pipe U23, when microcontroller receives institute
Then microcontroller controls the first switch pipe U23 conductings by OTG pins when stating load access signal so that the power end
USB_OUT is detected by the USB interface stand J5 to the first switch pipe U23, the first detection resistance R61 and second
Resistance R62 discharges.Microcontroller detects the electricity of the first switch pipe U23 drain electrodes by the current detecting end CUREENT1
Flow valuve come decision circuitry whether overcurrent or short circuit.When microcontroller detects circuit overcurrent or short circuit, then described in microcontroller control
First switch pipe U23 shutdowns, to achieve the purpose that protect circuit.
Further, traditional detection method works as circuit using the electric current for detecting the first switch pipe U23 source electrodes
When output short-circuit, microcontroller detects that circuit overcurrent then turns off the first switch pipe U23, but due to the output of USB port
It is directly coupled to the grid of the second switch pipe Q1 so that the second switch pipe Q1 is in the conduction state, and load is caused to be inserted into
Illusion, therefore the first switch pipe U23 can be connected again, be discharged.In the first switch pipe U23 by periodicity
During conducting, electric current is very big when due to short circuit, can there is the risk of damage component.The present embodiment is examined using electric current
The method in the drain electrode of the first switch pipe U23 is arranged in measuring point, and the current value that microcontroller is read when short circuit can surpass
Going out preset threshold value, then the first switch pipe U23 will not be switched on.When the electric current that microcontroller is read is in normal range (NR),
Microcontroller just allow circuit carry out load insertion judgement, so can be periodic to avoid the first switch pipe U23
Conducting, to play the role of protecting component.
Preferably, the cathode of the first zener diode ZD3 described in the present embodiment is connected by current detecting end CUREENT1
Connect the I/O pins of microcontroller.
As it can be seen that USB port output protection circuit provided in this embodiment is by including first switch pipe U23, detection resistance
The current detection module 3 of R6, current detecting end CUREENT1 and circuit protection unit 31, to realize USB port output protection electricity
The over-current detection and short-circuit protection of circuit in road.The side that the USB port output protection circuit is multiplexed using first switch pipe U23
Formula solves the problems, such as to need in prior art additionally to increase protection module；Meanwhile the setting of current detecting point is opened first
The mode for closing the drain electrode of pipe U23 avoids the excessive risk for be easy to causeing component damage of the electric current in short circuit, simplifies
Circuit structure reduces circuit cost, and also can avoid in circuit overcurrent or short circuit by the first zener diode ZD3
The drain electrode of Shi Suoshu first switch pipes U23 damages the risk of microcontroller pin there are excessively high voltage.
Embodiment 3
The utility model embodiment additionally provides a kind of electronic equipment, including as disclosed in the utility model any embodiment
USB port output protection circuit；Specific USB port output protection circuit is referred to saying for above-mentioned better embodiment
Bright, details are not described herein again.
It the above is only the better embodiment of the utility model, it is noted that above-mentioned better embodiment should not regard
For limitations of the present invention.The scope of protection of the utility model should be subject to claim limited range.For
For those skilled in the art, without departing from the spirit and scope of the utility model, it can also make several
Improvements and modifications, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (9)
1. a kind of USB port output protection circuit, which is characterized in that including load AM access module, access detection module and electric current
Detection module；The output end of the load AM access module is separately connected input terminal and the electric current inspection of the access detection module
Survey the input terminal of module；Wherein,
The access detection module includes detection load end；
The current detection module includes first switch pipe, detection resistance, current detecting end and circuit protection unit；Described first
The control terminal of switching tube is the control terminal of the current detection module, and the first end of the first switch pipe is the current detecting
The input terminal of module, the second end of the first switch pipe connect one end of the detection resistance, the detection resistance it is another
End ground connection, the first end of the first switch pipe connect the input terminal of the circuit protection unit, the circuit protection unit
Output end connects the current detecting end.
2. USB port output protection circuit as described in claim 1, which is characterized in that the circuit protection unit includes electricity
Appearance, first resistor and the first zener diode；
One end of the capacitance and one end of the first resistor are collectively as the input terminal of the circuit protection unit, the electricity
The other end of appearance is grounded, and the cathode of the other end of the first resistor and first zener diode is collectively as the circuit
The output end of protection location, the plus earth of first zener diode.
3. USB port output protection circuit as described in claim 1, which is characterized in that the load AM access module includes USB
Interface stand, power end, the first Schottky diode, second resistance and detection source input terminal；
The power input foot of the USB interface stand is separately connected one end of the power end and the second resistance, and described
The other end of two resistance connects the cathode of first Schottky diode, and the anode of first Schottky diode connects institute
State detection source input terminal；Output end of the grounding leg of the USB interface stand as the load AM access module, wherein described
USB interface stand further includes data input pin and data output pin.
4. USB port output protection circuit as claimed in claim 3, which is characterized in that the USB interface blocks attached bag includes
One pin, second pin, third pin, the 4th pin, the 5th pin and the 6th pin, wherein the first pin is the power supply
Input pin, the 4th pin are the grounding leg, and the 5th pin and the 6th pin are connected to the 4th pin, collectively as described negative
Carry the output end of AM access module；Second pin is the data output pin, and third pin is the data input pin.
5. USB port output protection circuit as described in claim 1, which is characterized in that the detection resistance includes the first inspection
One end of measuring resistance and the second detection resistance, one end of first detection resistance and second detection resistance is collectively as institute
State one end of detection resistance, the other end of the other end of first detection resistance and second detection resistance is collectively as institute
State the other end of detection resistance.
6. USB port output protection circuit as described in claim 1, which is characterized in that the access detection module includes the
Two switching tubes and 3rd resistor；
The control terminal of the second switch pipe and one end of the 3rd resistor are collectively as the input for accessing detection module
End, the other end of the 3rd resistor and the second end of the second switch pipe are grounded jointly, and the first of the second switch pipe
End connects the detection load end.
7. USB port output protection circuit as claimed in claim 6, which is characterized in that the second switch pipe is NMOS tube,
Control terminal, the first end and second end of the second switch pipe correspond to grid, drain electrode and the source electrode of the NMOS tube respectively.
8. USB port output protection circuit described in claim 1, which is characterized in that the first switch pipe is NMOS tube, institute
State the control terminal of first switch pipe, first end and second end corresponds to grid, drain electrode and the source electrode of the NMOS tube respectively.
9. a kind of electronic equipment, which is characterized in that including such as claim 1~8 any one of them USB port output protection electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721569823.1U CN207677423U (en) | 2017-11-21 | 2017-11-21 | A kind of USB port output protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721569823.1U CN207677423U (en) | 2017-11-21 | 2017-11-21 | A kind of USB port output protection circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN207677423U true CN207677423U (en) | 2018-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721569823.1U Expired - Fee Related CN207677423U (en) | 2017-11-21 | 2017-11-21 | A kind of USB port output protection circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964787A (en) * | 2021-11-04 | 2022-01-21 | 广东远通工业科技有限公司 | Protection circuit of sensor |
-
2017
- 2017-11-21 CN CN201721569823.1U patent/CN207677423U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964787A (en) * | 2021-11-04 | 2022-01-21 | 广东远通工业科技有限公司 | Protection circuit of sensor |
| CN113964787B (en) * | 2021-11-04 | 2023-08-04 | 广东远通工业科技有限公司 | Protection circuit of sensor |
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