CN105988963A - External power supply identification circuit for large current touch equipment and electronic signature screen - Google Patents
External power supply identification circuit for large current touch equipment and electronic signature screen Download PDFInfo
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- CN105988963A CN105988963A CN201510066569.2A CN201510066569A CN105988963A CN 105988963 A CN105988963 A CN 105988963A CN 201510066569 A CN201510066569 A CN 201510066569A CN 105988963 A CN105988963 A CN 105988963A
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Abstract
The invention is suitable for the field of electronics and provides an external power supply identification circuit for large current touch equipment and an electronic signature screen. The circuit comprises a USB (universal serial bus) detection unit, a DC (direct current) detection unit, an identification control unit and a filtering unit, wherein the USB detection unit is used for generating a USB detection signal during external USB power supply; the DC detection unit is used for generating a DC detection signal and DC power supply voltage/current during external DC power supply; the identification control unit is used for outputting USB power supply voltage/current when the USB detection signal is only received and stopping outputting USB power supply voltage/current when the DC detection signal is received; the filtering unit is used for filtering USB power supply voltage/current or DC power supply voltage/current. The circuit has the beneficial effects that low current USB power supply is used without external power adapters; under the condition of insufficiency of USB power supply, power is supplied by the external power adapters, and meanwhile, a USB power supply circuit is blocked to prevent the current of the power adapters from flowing back to the USB, thus solving the problem of insufficiency of USB power supply.
Description
Technical field
The invention belongs to electronic applications, particularly relate to a kind of external power supply for big electric current touch control device and identify
Circuit and electronic signature screen.
Background technology
With the development of electronic technology, electronic signature screen has been widely used in finance, mobile service, and
No paper office system.The electronic signature screen occurring on the market at present mostly uses USB to be powered, with
It is more and more higher that the response speed shield to electronic signature and display effect etc. require, liquid crystal display (Liquid
Crystal Display, LCD) size increasing, the required operating current of electronic signature screen is also increasingly
Greatly, and electric current that traditional USB power supply mode can provide is limited, cannot meet new power demands.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of external power supply for big electric current touch control device to identify electricity
Road, it is intended to solve existing USB electricity shortage, it is impossible to the problem meeting large-current electric signature screen power demands.
The embodiment of the present invention is achieved in that a kind of external power supply for big electric current touch control device identifies electricity
Road, described circuit includes:
USB detector unit, for when circumscribed USB is powered, generates USB detection signal, described USB
The input of detector unit is connected with circumscribed USB interface；
DC detector unit, for when external DC powers, generates DC detection signal and DC supply voltage
/ electric current, the input of described DC detector unit is connected with external power adapter；
Identification control unit, for when only receiving USB detection signal, exporting USB supply voltage/electricity
Stream, when receiving DC detection signal, stops output USB supply voltage/electric current, and described identification controls
The first input end of unit is connected with the output of described USB detector unit, the of described identification control unit
Two inputs are connected with the detection output of described DC detector unit；
Filter unit, for USB supply voltage/electric current or DC supply voltage/current filtering, described filter
The power supply with the output of described identification control unit and described DC detector unit simultaneously of the input of ripple unit
Output connects, the output of described filter unit input and the system power supply with described filter unit simultaneously
End connects.
The another object of the embodiment of the present invention is, provides one electronic signature screen, described electronic signature screen bag
Include:
USB I/O unit, USB HUB unit, control panel, electric capacity electromagnetic screen, and above-mentioned
External power supply identification circuit for big electric current touch control device；
Described USB I/O unit is connected with exterior PC, described USB HUB unit and described USB
I/O unit connects, and described control panel is connected with described USB HUB unit, described electric capacity electromagnetic screen
It is connected with described control panel.
The embodiment of the present invention is not in the case of having external power adapter, it is possible to use the USB of small area analysis supplies
Electricity, in the case of USB electricity shortage, can be powered by external power adapter, blocks USB simultaneously
Power supply circuits, prevent power supply adaptor electric current to usb bus reverse irrigated current, solve USB electricity shortage,
The problem that cannot meet large-current electric signature screen power demands.
Brief description
The knot of the external power supply identification circuit for big electric current touch control device that Fig. 1 provides for the embodiment of the present invention
Composition；
Showing of the external power supply identification circuit for big electric current touch control device that Fig. 2 provides for the embodiment of the present invention
Example circuit structure diagram；
The structure chart of the electronic signature screen that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only it should be appreciated that specific embodiment described herein
It only in order to explain the present invention, is not intended to limit the present invention.Additionally, each reality of invention described below
As long as execute technical characteristic involved in mode each other do not constitute conflict just can be mutually combined.
The embodiment of the present invention, in the case of not having external power adapter, uses the USB of small area analysis to power,
In the case of USB electricity shortage, powered by external power adapter, block USB simultaneously and power electricity
Road, prevents power supply adaptor electric current to usb bus reverse irrigated current, the problem solving USB electricity shortage.
It is described in detail below in conjunction with the realization to the present invention for the specific embodiment:
Fig. 1 shows the external power supply identification circuit for big electric current touch control device that the embodiment of the present invention provides
Structure, for convenience of description, illustrate only part related to the present invention.
As one embodiment of the invention, this external power supply identification circuit can apply to the touch-control of any big electric current
It in equipment, is particularly suited in the electronic signature screen of big electric current, should be for the external confession of big electric current touch control device
Electricity identification circuit 1 specifically includes:
USB detector unit 11, at circumscribed USB (Universal Serial Bus, USB)
During power supply, generate USB detection signal, the input of USB detector unit 11 and circumscribed USB interface (PC
USB interface) connect；
DC detector unit 12, for when external DC powers, generates DC detection signal and DC powers electricity
Pressure/electric current, the input of DC detector unit 12 is connected with external power adapter；
Identification control unit 13, for when only receiving USB detection signal, exporting USB supply voltage
/ electric current, when receiving DC detection signal, stops output USB supply voltage/electric current, identifies that control is single
The first input end of unit 13 is connected with the output of USB detector unit 11, the of identification control unit 13
Two inputs are connected with the detection output of DC detector unit 12；
Filter unit 14, for USB supply voltage/electric current or DC supply voltage/current filtering, filtering
The input of unit 14 is simultaneously defeated with the power supply of the output of identification control unit 13 and DC detector unit 12
Going out end to connect, the output of filter unit 14 connects with input and the system power supply end of filter unit 14 simultaneously
Connect.
The embodiment of the present invention is not in the case of having external power adapter, it is possible to use the USB of small area analysis supplies
Electricity, in the case of USB electricity shortage, can be powered by external power adapter, and power supply adaptor supplies
The electric current of electricity can select according to the actual demand of equipment, generally can choose the power adaptation of big electric current
Device, blocks USB power supply circuits simultaneously, prevents power supply adaptor electric current to usb bus reverse irrigated current, solves
Determine USB electricity shortage, it is impossible to the problem meeting large-current electric signature screen power demands.
Fig. 2 shows the external power supply identification circuit for big electric current touch control device that the embodiment of the present invention provides
Exemplary circuit structure, for convenience of description, illustrate only part related to the present invention.
As one embodiment of the invention, this USB detector unit 11 includes:
Electric capacity C5, electric capacity C6, electric capacity C7 and diode D12；
The anode of diode D12 is the input of USB detector unit 11, and the negative electrode of diode D12 is
The output of USB detector unit 11 is connected with electric capacity C5, electric capacity C6, one end of electric capacity C7 simultaneously, electricity
Appearance C5, electric capacity C6, the other end of electric capacity C7 are grounded simultaneously.
DC detector unit 12 includes:
Diode D9, resistance R3 and second switch pipe Q2；
The anode of diode D9 be DC detector unit 12 input simultaneously with one end of resistance R3 and the
The control end of two switching tube Q2 connects, and the negative electrode of diode D9 is the power supply output of DC detector unit 12
Holding, the other end of resistance R3 and the output of second switch pipe Q2 are grounded simultaneously, second switch pipe Q2's
Input is the detection output of DC detector unit 12.
As one embodiment of the present invention, this second switch pipe Q2 can use NPN type triode to realize,
The base stage of this NPN type triode is the control end of second switch pipe Q2, and the current collection of NPN type triode is extremely
The input of second switch pipe Q2, the output of the transmitting of NPN type triode extremely second switch pipe Q2.
Identification control unit 13 includes:
Resistance R4, resistance R5 and the 3rd switching tube Q3；
One end of resistance R4 is the input of the first input end of identification control unit 13 and the 3rd switching tube Q3
End connects, and the other end of resistance R4 is the second input one end with resistance R5 of identification control unit 13
Connecting, the other end of resistance R5 and the control end of the 3rd switching tube Q3 connect, and the 3rd switching tube Q3's is defeated
Go out the output that end is identification control unit 13.
As one embodiment of the present invention, the 3rd switching tube Q3 can use N-type metal-oxide-semiconductor to realize,
The grid of this N-type metal-oxide-semiconductor is the control end of the 3rd switching tube Q3, and the drain electrode of N-type metal-oxide-semiconductor is the 3rd
The input of switching tube Q3, the grid of N-type metal-oxide-semiconductor is the output of the 3rd switching tube Q3.
Filter unit 14 includes:
Electric capacity C8 and electric capacity C13；
One end of electric capacity C13 is the input of filter unit 14, and one end of electric capacity C8 is filter unit 14
Output be connected with one end of electric capacity C13, the other end of electric capacity C13 and electric capacity C8 is grounded simultaneously.
As one embodiment of the invention, for the ease of grafting, this external power supply identification circuit 1 can also include:
First interface J1, first interface J1 are USB interface, the energization pins (USB5V) of USB interface
It is connected with the input of USB detector unit 11, the grounding pin ground connection of USB interface；
Second interface J2, the second interface J2 are DC interface, the energization pins (USB5V) of the second interface J2
It is connected with the input of DC detector unit 12, the DC pin (HAND1) of the second interface J2 and ground connection
Pin is grounded simultaneously.
In embodiments of the present invention, under normal condition, first interface J1 is connected with the USB interface of PC, by
USB, to system power supply, feeds system, now the 3rd switching tube when USB inserts by diode D12
The grid of Q3 is high level, power supply by diode D12, the 3rd switching tube Q3 to electric capacity C13 positive pole,
To system for 5V voltage；
When USB powers and cannot meet big electric current touch control device, the second interface J2 external power adapter,
Direct current (DC) is taked to power, when external DC inserts, the base stage high level of second switch pipe Q2, the
Two switching tube Q2 conductings, the grid low level of the 3rd switching tube Q3, the 3rd switching tube Q3 disconnects, and blocks
USB to system power supply, DC by diode D9 to system power supply, diode D12 reverse blocking simultaneously
Circuit pours in down a chimney to USB.
As one embodiment of the invention, this external power supply identification circuit 1 can also include:
USB indicating member 15, for sending acousto-optic indication signal when circumscribed USB is powered, USB indicates
The input of unit 15 is connected with the output of USB detector unit 11.
Preferably, this USB indicating member 15 includes:
Resistance R1, resistance R2 and LED 1；
One end of resistance R1 is that the input of USB indicating member 15 connects with the anode of LED 1
Connecing, the other end of resistance R1 is connected with the negative electrode of LED 1 and one end of resistance R2 simultaneously,
The other end ground connection of resistance R2.
In embodiments of the present invention, by red light emitting diodes, USB power supply state can be shown in real time
Showing, i.e. when grafting USB powers, red light emitting diodes is lighted.
Furthermore it is also possible to send prompt tone by connecting loudspeaker, i.e. when grafting USB powers, send " dripping "
A sound prompt tone, represent USB grafting success.
The embodiment of the present invention is not in the case of having external power adapter, it is possible to use the USB of small area analysis supplies
Electricity, in the case of USB electricity shortage, can be powered by external power adapter, blocks USB simultaneously
Power supply circuits, prevent power supply adaptor electric current to usb bus reverse irrigated current, solve USB electricity shortage,
The problem that cannot meet large-current electric signature screen power demands.
The another object of the embodiment of the present invention is, provides a kind of electricity using above-mentioned external power supply identification circuit
Son signature screen.
Fig. 3 shows the structure that the electronic signature that the embodiment of the present invention provides is shielded, and for convenience of description, only shows
Go out part related to the present invention.
As one embodiment of the invention, this electronic signature screen 10 includes:
USB I/O unit the 2nd, USB HUB unit the 3rd, control panel the 4th, electric capacity electromagnetic screen 5, and
The external power supply identification circuit for big electric current touch control device that above-described embodiment provides；
USB I/O unit 2 is connected with exterior PC, USB HUB unit 3 and USB input/output
Unit 2 connects, and control panel 4 is connected with USB HUB unit 3, and electric capacity electromagnetic screen 5 is with control panel 4 even
Connect.
In embodiments of the present invention, time writer is transmitted wireless signals to electric capacity electromagnetic screen 5, electric capacity electromagnetic screen 5
The electromagnetic touch signal sending time writer positions, and the signal after control panel 4 will position is converted into USB
Signal, then passed by USB HUB (transponder of multiport) unit 3 and USB I/O unit 2
To PC, PC is identified according to usb signal and positions.
This electromagnetic touch signal is different from conventional mouse signal, and conventional mouse signal can only provide light and be marked on screen
X, the coordinate of Y-axis thus calculate track, and this electromagnetic touch signal not only has X, Y-axis signal, and
May also provide the signal of Z axis, identify, by the signal of Z axis, the weight that pen presses, it is thick that ink marks is write
Thin and the vigour of style in writing.
PC (personal computer, personal computer), it is also possible to vision signal is passed by usb signal
To control panel 4, usb signal is converted into the LVDS signal that electric capacity electromagnetic screen 5 can identify by control panel 4
(Low Voltage Differential Signal, low-voltage differential signal) shows for electric capacity electromagnetic screen 5.
In the process, can be whole by the external power supply identification circuit 1 for big electric current touch control device
System (electronic signature screen 10) power supply, when USB electricity shortage, by external power adapter for being
System provides big electric current, and in the case of not having power supply adaptor, still can realize that USB supplies by PC
Electricity.
The embodiment of the present invention is not in the case of having external power adapter, it is possible to use the USB of small area analysis supplies
Electricity, in the case of USB electricity shortage, can be powered by external power adapter, blocks USB simultaneously
Power supply circuits, prevent power supply adaptor electric current to usb bus reverse irrigated current, solve USB electricity shortage,
The problem that cannot meet large-current electric signature screen power demands.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Any modification, equivalent and the improvement etc. made within spirit and principle, should be included in the guarantor of the present invention
Within the scope of protecting.
Claims (10)
1. the external power supply identification circuit for big electric current touch control device, it is characterised in that described circuit
Including:
USB detector unit, for when circumscribed USB is powered, generates USB detection signal, described USB
The input of detector unit is connected with circumscribed USB interface；
DC detector unit, for when external DC powers, generates DC detection signal and DC supply voltage
/ electric current, the input of described DC detector unit is connected with external power adapter；
Identification control unit, for when only receiving USB detection signal, exporting USB supply voltage/electricity
Stream, when receiving DC detection signal, stops output USB supply voltage/electric current, and described identification controls
The first input end of unit is connected with the output of described USB detector unit, the of described identification control unit
Two inputs are connected with the detection output of described DC detector unit；
Filter unit, for USB supply voltage/electric current or DC supply voltage/current filtering, described filter
The power supply with the output of described identification control unit and described DC detector unit simultaneously of the input of ripple unit
Output connects, the output of described filter unit input and the system power supply with described filter unit simultaneously
End connects.
2. circuit as claimed in claim 1, it is characterised in that described USB detector unit includes:
Electric capacity C5, electric capacity C6, electric capacity C7 and diode D12；
The anode of described diode D12 is the input of described USB detector unit, described diode D12
Negative electrode be described USB detector unit output simultaneously with described electric capacity C5, described electric capacity C6, described
One end of electric capacity C7 connects, described electric capacity C5, described electric capacity C6, described electric capacity C7 the other end simultaneously
Ground connection.
3. circuit as claimed in claim 1, it is characterised in that described DC detector unit includes:
Diode D9, resistance R3 and second switch pipe；
With described resistance R3 while the anode of described diode D9 is the input of described DC detector unit
The control end of one end and described second switch pipe connects, and the negative electrode of described diode D9 is described DC detection
The power supply output of unit, the other end of described resistance R3 and the output of described second switch pipe connect simultaneously
Ground, the input of described second switch pipe is the detection output of described DC detector unit.
4. circuit as claimed in claim 1, it is characterised in that described identification control unit includes:
Resistance R4, resistance R5 and the 3rd switching tube；
One end of described resistance R4 is the first input end of described identification control unit and described 3rd switching tube
Input connect, the other end of described resistance R4 is the second input and the institute of described identification control unit
The one end stating resistance R5 connects, and the other end of described resistance R5 is connected with the control end of described 3rd switching tube,
The output of described 3rd switching tube is the output of described identification control unit.
5. circuit as claimed in claim 4, it is characterised in that described 3rd switching tube Q3 is N-type
Metal-oxide-semiconductor, the grid of described N-type metal-oxide-semiconductor is the control end of described 3rd switching tube, described N-type MOS
The drain electrode of pipe is the input of described 3rd switching tube, and the grid of described N-type metal-oxide-semiconductor is the described 3rd to open
Close the output of pipe.
6. circuit as claimed in claim 1, it is characterised in that described filter unit includes:
Electric capacity C8 and electric capacity C13；
One end of described electric capacity C13 is the input of described filter unit, and one end of described electric capacity C8 is institute
The output stating filter unit is connected with one end of described electric capacity C13, described electric capacity C13 and described electric capacity
The other end of C8 is grounded simultaneously.
7. circuit as claimed in claim 1, it is characterised in that described circuit also includes:
USB indicating member, for sending acousto-optic indication signal when circumscribed USB is powered, described USB refers to
Show that the input of unit is connected with the output of described USB detector unit.
8. circuit as claimed in claim 7, it is characterised in that described USB indicating member includes:
Resistance R1, resistance R2 and LED 1；
One end of described resistance R1 is the input of described USB indicating member and described light emitting diode
The anode of LED1 connects, the other end of the described resistance R1 negative electrode with described LED 1 simultaneously
Connect with one end of described resistance R2, the other end ground connection of described resistance R2.
9. circuit as claimed in claim 1, it is characterised in that described circuit also includes:
First interface, described first interface is USB interface, the energization pins (USB5V) of described USB interface
It is connected with the input of described USB detector unit, the grounding pin ground connection of described USB interface；
Second interface, described second interface DC interface, the energization pins (USB5V) of described second interface
Being connected with the input of described DC detector unit, the DC pin of described second interface is with grounding pin simultaneously
Ground connection.
10. an electronic signature screen, it is characterised in that described electronic signature screen includes:
USB I/O unit, USB HUB unit, control panel, electric capacity electromagnetic screen, and such as right
Require the external power supply identification circuit for big electric current touch control device described in 1 to 8 any one；
Described USB I/O unit is connected with exterior PC, described USB HUB unit and described USB
I/O unit connects, and described control panel is connected with described USB HUB unit, described electric capacity electromagnetic screen
It is connected with described control panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066569.2A CN105988963B (en) | 2015-02-09 | 2015-02-09 | External power supply identification circuit and electronic signature screen for high current touch control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066569.2A CN105988963B (en) | 2015-02-09 | 2015-02-09 | External power supply identification circuit and electronic signature screen for high current touch control device |
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| Publication Number | Publication Date |
|---|---|
| CN105988963A true CN105988963A (en) | 2016-10-05 |
| CN105988963B CN105988963B (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510066569.2A Active CN105988963B (en) | 2015-02-09 | 2015-02-09 | External power supply identification circuit and electronic signature screen for high current touch control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113452361A (en) * | 2020-03-27 | 2021-09-28 | 瑞昱半导体股份有限公司 | Universal serial bus signal output circuit with reverse flow current prevention mechanism |
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| CN113452361A (en) * | 2020-03-27 | 2021-09-28 | 瑞昱半导体股份有限公司 | Universal serial bus signal output circuit with reverse flow current prevention mechanism |
| CN113452361B (en) * | 2020-03-27 | 2024-04-05 | 瑞昱半导体股份有限公司 | Universal serial bus signal output circuit with reverse current prevention mechanism |
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| Publication number | Publication date |
|---|---|
| CN105988963B (en) | 2019-05-10 |
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