CN110109792A - USB device plug-pull detecting circuit under a kind of operating system off-line state - Google Patents
USB device plug-pull detecting circuit under a kind of operating system off-line state Download PDFInfo
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- CN110109792A CN110109792A CN201910439631.6A CN201910439631A CN110109792A CN 110109792 A CN110109792 A CN 110109792A CN 201910439631 A CN201910439631 A CN 201910439631A CN 110109792 A CN110109792 A CN 110109792A
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- 230000005669 field effect Effects 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 27
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000002262 irrigation Effects 0.000 claims description 2
- 238000003973 irrigation Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 5
- 238000009510 drug design Methods 0.000 abstract description 3
- 238000011897 real-time detection Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/2215—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test error correction or detection circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
- G06F11/273—Tester hardware, i.e. output processing circuits
- G06F11/2733—Test interface between tester and unit under test
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Sources (AREA)
Abstract
The invention discloses USB device plug-pull detecting circuits under a kind of operating system off-line state, including the USB connector for connecting USB device and the USB plug-pull detecting circuit for detecting USB device plug state, the USB connector is electrically connected with the USB plug-pull detecting circuit.Compared to traditional technology, the present invention has rational design, power consumption is lower, facilitate user still can be with the plug state of real-time detection USB under operating system off-line state, cooperate the USB plug-pull detecting circuit as composed by various passive devices based on USB connector, has many advantages, such as that power consumption is low, can normally plug USB to realize data communication.
Description
Technical field
The present invention relates to USB circuit field, USB device plug detection electricity under especially a kind of operating system off-line state
Road.
Background technique
The detection of USB device at present, typically by operating system (such as windows, android etc.) go judgement be
It is no to have data communication, when operating system is in off-line state, USB device can not just be detected whether plug, therefore can not
Carry out the effective serviceable condition for reminding user USB.Also, under traditional mode, it is if necessary to constant testing USB device
No by plug, operating system must be always on, then can a large amount of waves for some low-power consumption products, such as handheld device etc.
Power-consuming energy.
Summary of the invention
To solve the above-mentioned problems, the object of the present invention is to provide USB devices under a kind of operating system off-line state to plug
Detection circuit, it is low in energy consumption, while facilitating the plug state of user's real-time detection USB.
In order to make up for the deficiencies of the prior art, technical solution used in the embodiment of the present invention is:
USB device plug-pull detecting circuit under a kind of operating system off-line state connects including the USB for connecting USB device
Device and the USB plug-pull detecting circuit for detecting USB device plug state are connect, the USB connector and USB plug detect
Circuit electrical connection；
The USB plug-pull detecting circuit includes as the field-effect tube of USB device plug detecting element, for preventing circuit
The first diode of electric current reverse irrigation, is used for conduct at the first resistor for providing bias voltage for the grid of the field-effect tube
The second resistance of the output loading of the field-effect tube, for exporting high level or low level to judge inspection that whether USB is inserted into
Survey level output end and for preventing USB device generated interference during plug from damaging the protection of the field-effect tube
Circuit；
The protection circuit includes zener diode, for excluding USB device generated interference electricity during plug
The first capacitor of stream and the second diode for playing anti-reverse protective effect for the field-effect tube；The field-effect tube
Source electrode is connected to by the second resistance with reference to ground, the detection level output end be set to the source electrode of the field-effect tube with
Between the second resistance；The grid of the field-effect tube is connected respectively to positive, described first electricity of the zener diode
Hold one end and described first resistor one end, the anode of the zener diode and the first capacitor other end are connected to reference
Ground, the first resistor other end is connected respectively to drain electrode and the cathode of second diode of the field-effect tube, described
The anode of second diode is connected to reference to ground；
The Metal shielding shell of the USB connector is connected to the cathode of the first diode, the first diode
Anode be connected respectively to positive, the described first capacitor, the first resistor and the field-effect tube of the zener diode
Grid.
Further, the USB connector and the USB plug-pull detecting circuit form detection group, the detection group setting
Have mutually indepedent between several groups and each detection group.
Further, the USB connector has the DM data-interface and DP data-interface for connecting USB device.
Further, the USB plug-pull detecting circuit further includes for carrying out power supply for the USB plug-pull detecting circuit
Power supply, the power supply are connected to the drain electrode of the field-effect tube by second diode.
Further, the power supply is button cell, and the anode of the button cell is connected to second diode
Anode, the cathode of the button cell are connected to reference to ground.
The one or more technical solutions provided in the embodiment of the present invention are at least had the following beneficial effects: and are connected based on USB
Device cooperation USB plug-pull detecting circuit as composed by various passive devices is connect, with power consumption is low, can plug USB normally with reality
The advantages that existing data communication；The Metal shielding shell of USB connector and the ground wire of external circuit are not connected directly, but are connect in USB
The input terminal of plug-pull detecting circuit, when USB device is not inserted into, the cathode of first diode is in vacant state, because of the first electricity
The bias of resistance, field-effect tube are in off state, then detect level output end output low level, illustrate that USB device is not inserted
Enter；When USB device insertion, since the Metal shielding shell of Universal USB equipment is connect with ground wire, USB can be made to connect
The Metal shielding shell ground connection of device is connect, then the cathode ground connection of first diode, field-effect tube conducting, detection level output end output
High level illustrates that USB device is inserted into.Therefore, the present invention has rational design, and power consumption is lower, facilitates user in the offline shape of operating system
It still can be with the plug state of real-time detection USB under state.
Detailed description of the invention
Present pre-ferred embodiments are provided, with reference to the accompanying drawing with the embodiment that the present invention will be described in detail.
Fig. 1 is the circuit theory of USB device plug-pull detecting circuit under a kind of operating system off-line state of the embodiment of the present invention
Figure.
Specific embodiment
This part will be described in specific embodiments of the present invention, and the preferred embodiments of the invention is shown in the accompanying drawings, attached
The effect of figure be with figure remark additionally book word segment description, enable a person to intuitively, visually understand of the invention
Each technical characteristic and overall technical architecture, but it should not be understood as limiting the scope of the invention.
In the description of the present invention, it is to be understood that, be related to orientation description, for example, above and below, front, rear, left and right etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.
In the description of the present invention, several to be meant that one or more, it is multiple to be meant that two or more, be greater than,
Be less than, more than etc. be interpreted as not including this number, it is above, following, within etc. be interpreted as including this number.If there is being described to first,
Second is only intended to for the purpose of distinguishing technical characteristic, is not understood to indicate or imply relative importance or implicitly indicates institute
The quantity of the technical characteristic of instruction or the precedence relationship for implicitly indicating indicated technical characteristic.
In description of the invention, unless otherwise restricted clearly, the words such as setting, installation, connection be shall be understood in a broad sense, institute
Above-mentioned word in the present invention specific can rationally be determined with the particular content of combination technology scheme by belonging to technical field technical staff
Meaning.
With reference to the accompanying drawing, the embodiment of the present invention is further elaborated.
Referring to Fig.1, the embodiment of the invention provides USB device plug-pull detecting circuit under a kind of operating system off-line state,
Including the USB connector U1 for connecting USB device and the USB plug-pull detecting circuit for detecting USB device plug state
100, the USB connector U1 is electrically connected with the USB plug-pull detecting circuit 100；
The USB plug-pull detecting circuit 100 includes as the field-effect tube Q1 of USB device plug detecting element, for preventing
Only circuital current flow backward first diode D1, for providing the first resistor of bias voltage for the grid of the field-effect tube Q1
R1, for the second resistance R2 of the output loading as the field-effect tube Q1, for exporting high level or low level to judge
Detection level output end DET-OUT that whether USB is inserted into and for preventing USB device generated interference during plug
Damage the protection circuit of the field-effect tube Q1；
The protection circuit includes zener diode D3, for excluding USB device generated interference during plug
The first capacitor C1 of electric current and the second diode D2 for playing anti-reverse protective effect for the field-effect tube Q1；The field
The source electrode of effect pipe Q1 is connected to by the second resistance R2 with reference to ground, and the detection level output end DET-OUT is set to
Between the source electrode of the field-effect tube Q1 and the second resistance R2；The grid of the field-effect tube Q1 is connected respectively to described steady
Positive, described one end first capacitor C1 and the one end the first resistor R1 of diode D3 are pressed, the zener diode D3 is just
Pole and the first capacitor C1 other end are connected to reference to ground, and the first resistor R1 other end is connected respectively to the field-effect
The drain electrode of pipe Q1 and the cathode of the second diode D2, the anode of the second diode D2 are connected to reference to ground；
The Metal shielding shell of the USB connector U1 is connected to the cathode of the first diode D1, and the described 1st
The anode of pole pipe D1 be connected respectively to the zener diode D3 positive, described first capacitor C1, the first resistor R1 and
The grid of the field-effect tube Q1.
In the present embodiment, USB connector U1 can be used for connecting USB, realize normal data communication, be connected based on USB
Device U1 cooperation USB plug-pull detecting circuit 100 as composed by various passive devices is connect, with power consumption is low, can normally plug USB
The advantages that realize data communication；The Metal shielding shell of USB connector U1 and the ground wire of external circuit are not connected directly, but are connect
In the input terminal of USB plug-pull detecting circuit 100, when USB device is not inserted into, the cathode of first diode D1 is in hanging shape
State, because of the bias of first resistor R1, field-effect tube Q1 is in off state, then detects level output end DET-OUT output
Low level illustrates that USB device is not inserted into；When USB device insertion, since the Metal shielding shell of Universal USB equipment is and ground
Line connection, therefore if insertion USB device, USB device can be made to be electrically connected with USB connector U1, therefore pass through USB
The relationship that equipment is connect with ground wire can be such that the Metal shielding shell of USB connector U1 is grounded at this moment, then first diode
The cathode of D1 is grounded, and field-effect tube Q1 is connected at this time, and detection level output end DET-OUT exports high level, illustrates that USB device is inserted
Enter.
Using detection level output end DET-OUT test level height, whether measurement USB device is inserted into indirectly to realize, should
Mode is directly considerable, monitors convenient for user；What the second diode D2, zener diode D3 and first capacitor C1 cooperated acts on
In: protected for predominantly detecting device field-effect tube Q1, while enable first diode D1 conducting input signal through
It is exported again after crossing filtering, the interference electric current for preventing USB device from generating in swapping process is flowed into field-effect tube Q1, guarantees inspection
That surveys is normally carried out；First resistor R1, which then plays, provides the purpose of bias voltage for field-effect tube Q1, and second resistance R2 is as defeated
It loads out, plays and provide the purpose of detection voltage for detection level output end DET-OUT.
Therefore, the present invention has rational design, and power consumption is lower, facilitates user still can be real-time under operating system off-line state
Detect the plug state of USB.
Further, another embodiment of the present invention provides USB device plug detections under a kind of operating system off-line state
Circuit, wherein the USB connector U1 and the USB plug-pull detecting circuit 100 form detection group, and the detection group is provided with
It is mutually indepedent between several groups and each detection group.In the present embodiment, relationship similar can be interpreted as circuit between each detection group
In parallel relationship between multiple resistance, design in this way can accommodate the insertion situation for detect multiple USB devices simultaneously, for need
The frequently locality (such as printing portion etc.) of plug USB device, is able to ascend the detection efficiency of its USB device.
Further, another embodiment of the present invention provides USB device plug detections under a kind of operating system off-line state
Circuit, wherein the USB connector U1 has the DM data-interface and DP data-interface for connecting USB device.In this implementation
In example, two data-interfaces that USB connector U1 has universality strong can be matched with the USB device of polymorphic type, for user
For, it is more convenient to use.
Further, another embodiment of the present invention provides USB device plug detections under a kind of operating system off-line state
Circuit, wherein the USB plug-pull detecting circuit 100 further includes for carrying out power supply for the USB plug-pull detecting circuit 100
Power supply B1, the power supply B1 are connected to the drain electrode of the field-effect tube Q1 by the second diode D2.In the present embodiment,
Power supply B1 is powered by the second diode D2 of forward conduction to field-effect tube Q1, due to USB plug-pull detecting circuit 100
Using being all small-power passive device, such as capacitor, resistance etc., therefore power supply B1 voltage is lower, generally reaches output energy
Enough be connected the second diode D2, the power of such integrated circuit is low, also has preferable protection to each passive device
Property.
Further, another embodiment of the present invention provides USB device plug detections under a kind of operating system off-line state
Circuit, wherein the power supply B1 is button cell, and the anode of the button cell is being connected to the second diode D2 just
Pole, the cathode of the button cell are connected to reference to ground.In the present embodiment, power supply B1 preferably uses button cell, voltage
It is not high, coincident circuit design requirement, and it is at low cost, it is convenient for industrial production, naturally it is also possible to use pressure common voltage source or electricity
Stream source is replaced.
Presently preferred embodiments of the present invention and basic principle is discussed in detail in the above content, but the invention is not limited to
Above embodiment, those skilled in the art should be recognized that also have on the premise of without prejudice to spirit of the invention it is various
Equivalent variations and replacement, these equivalent variations and replacement all fall within the protetion scope of the claimed invention.
Claims (5)
1. USB device plug-pull detecting circuit under a kind of operating system off-line state, it is characterised in that:
Including the USB connector for connecting USB device and the USB plug-pull detecting circuit for detecting USB device plug state,
The USB connector is electrically connected with the USB plug-pull detecting circuit；
The USB plug-pull detecting circuit includes as the field-effect tube of USB device plug detecting element, for preventing circuital current
The first diode of reverse irrigation, is used for described in conduct the first resistor for providing bias voltage for the grid of the field-effect tube
The second resistance of the output loading of field-effect tube, for exporting high level or low level to judge detection that whether USB is inserted into electricity
Flat output end and for preventing USB device generated interference during plug from damaging the protection electricity of the field-effect tube
Road；
The protection circuit includes zener diode, for excluding USB device generated interference electric current during plug
First capacitor and the second diode for playing anti-reverse protective effect for the field-effect tube；The source electrode of the field-effect tube
Be connected to by the second resistance with reference to ground, the detection level output end be set to the source electrode of the field-effect tube with it is described
Between second resistance；The grid of the field-effect tube is connected respectively to positive, the described first capacitor one of the zener diode
End and described first resistor one end, the anode of the zener diode and the first capacitor other end are connected to reference to ground, institute
State the first resistor other end be connected respectively to the field-effect tube drain electrode and second diode cathode, the described 2nd 2
The anode of pole pipe is connected to reference to ground；
The Metal shielding shell of the USB connector is connected to the cathode of the first diode, and the first diode is just
Pole is connected respectively to the grid of positive, the described first capacitor of the zener diode, the first resistor and the field-effect tube
Pole.
2. USB device plug-pull detecting circuit under a kind of operating system off-line state according to claim 1, feature exist
In: the USB connector and the USB plug-pull detecting circuit form detection group, and the detection group is provided with several groups and each inspection
It is mutually indepedent between survey group.
3. USB device plug-pull detecting circuit under a kind of operating system off-line state according to claim 1 or 2, feature
Be: the USB connector has the DM data-interface and DP data-interface for connecting USB device.
4. USB device plug-pull detecting circuit under a kind of operating system off-line state according to claim 1 or 2, feature
Be: the USB plug-pull detecting circuit further includes the power supply for carrying out power supply for the USB plug-pull detecting circuit, the electricity
Source is connected to the drain electrode of the field-effect tube by second diode.
5. USB device plug-pull detecting circuit under a kind of operating system off-line state according to claim 4, feature exist
In: the power supply is button cell, and the anode of the button cell is connected to the anode of second diode, the button electricity
The cathode in pond is connected to reference to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910439631.6A CN110109792B (en) | 2019-05-24 | 2019-05-24 | USB device plug detection circuit under off-line state of operating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910439631.6A CN110109792B (en) | 2019-05-24 | 2019-05-24 | USB device plug detection circuit under off-line state of operating system |
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| Publication Number | Publication Date |
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| CN110109792A true CN110109792A (en) | 2019-08-09 |
| CN110109792B CN110109792B (en) | 2024-06-25 |
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| CN201910439631.6A Active CN110109792B (en) | 2019-05-24 | 2019-05-24 | USB device plug detection circuit under off-line state of operating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766545A (en) * | 2020-05-14 | 2020-10-13 | 浙江南都电源动力股份有限公司 | Connector testing method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110109792B (en) | 2024-06-25 |
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