CN101571742B - Power supply device for electromagnetic induction module of electromagnetic liquid crystal touch screen - Google Patents
Power supply device for electromagnetic induction module of electromagnetic liquid crystal touch screen Download PDFInfo
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- CN101571742B CN101571742B CN200810105385A CN200810105385A CN101571742B CN 101571742 B CN101571742 B CN 101571742B CN 200810105385 A CN200810105385 A CN 200810105385A CN 200810105385 A CN200810105385 A CN 200810105385A CN 101571742 B CN101571742 B CN 101571742B
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Abstract
The invention discloses a power supply device for an electromagnetic induction module of an electromagnetic liquid crystal touch screen, belonging to periphery equipment of computers. Without changingthe function of the touch screen, the current requirement of the electromagnetic induction module for the computer is lowered to below 1mA. The working current of the electromagnetic induction module is not directly supplied by a USB interface of the computer again but supplied by a power module of the touch screen. A voltage conversion circuit and a switch circuit are connected between the power module and the electromagnetic induction module and are respectively connected with the USB interface of the computer. A power end of the USB is connected with a control port and a power input end of the switch circuit. An output port of the voltage conversion circuit is connected with an input port and a power input end of the switch circuit. By adopting the device, after the working current of the electromagnetic induction module is supplied by the power module of the touch screen, the output current of the USB interface of the computer is greatly lowered, thereby avoiding the aging of a USB controller of the computer.
Description
Technical field
The invention belongs to field of computer peripheral, relate to a kind of electric supply installation of electromagnetic induction module of electromagnetic liquid crystal touch screen.
Background technology
At present; The electromagnetic type touching technique since bearing accuracy high, can obtain an angle of inclination and pressure information, not influence advantage such as screen display quality when being used to show the field; Extremely market favor is widely used in equipment such as TabletPC (handwritten computer), plotting sheet, handwriting pad, mobile phone, e-book.
The electromagnetic type liquid crystal touch screen is made up of electromagnetic induction module and Liquid crystal module.Electromagnetic induction module is made up of electromagnetic induction screen and time writer, is used for controlling handwriting input.Concrete principle of work is: electromagnetic induction screen emission electromagnetic field; In the magnetic field range that produces; The time writer of built-in resonance electronic loop can be put aside faint energy; Through this energy, time writer is calculated coordinate, angle of inclination, mode of operation such as speed, the pressure sensitivity etc. of time writer to electromagnetic induction screen emission electromagnetic signal by the electromagnetic induction screen.Electromagnetic induction module generally is connected with computing machine through the USB connecting line, realizes and the data interaction of computing machine that the working current of electromagnetic induction module is provided through the USB mouth by computing machine, and WV is 5V, and working current is generally tens milliamperes.
Liquid crystal module is made up of power module, data acquisition module, backlight module and LCD MODULE.The function of power module is for converting common alternating current (exchanging 100～240V, 50/60Hz) to the 12V direct current, and the brilliant assembly of feed flow uses; Data acquisition module is claimed A/D plate (Analog DigitalBoard) again, and its function is that outside VGA or DVI vision signal are transformed into the signal that LCD MODULE can be used; The required power supply of data acquisition module work is provided by power module; Backlight module, for display provides backlight, backlight module is generally white backlight source or RGB (red/green/indigo plant) three primary light source, and its working power is provided by power module; LCD MODULE: will show from the vision signal that the A/D plate transmits, its working power is provided by power module.
It is as shown in Figure 1 that the electrical equipment of available liquid crystal assembly each several part connects synoptic diagram, and the external communication electricity is respectively backlight module, A/D plate, LCD MODULE power supply after power module converts the 12V direct current into.
When the electromagnetic type liquid crystal touch screen is connected on the computing machine; Occur following problem easily: the electromagnetic induction module of electromagnetic type liquid crystal touch screen passes through the USB confession by computing machine; After working long hours, cause the USB controller of computing machine aging easily, influence the serviceable life of computing machine; The power of some computing machines is little, and the electromagnetic induction module of electromagnetic type liquid crystal touch screen is connected to computing machine during as if computer starting, then can cause computing machine normally not start.
Summary of the invention
Technical matters to be solved by this invention is: guarantee that the electromagnetical type touch screen function is constant, that is: start working when electromagnetic induction module is connected with computing machine USB mouth; After the disconnection of USB mouth was connected, electromagnetic induction module quit work, and the current requirements of electromagnetic induction module to computing machine is reduced to below the 1mA.
Technical scheme
The technical solution adopted for the present invention to solve the technical problems is: the working current of electromagnetic induction module directly provides without the USB mouth of computing machine, and is provided by the power module of electromagnetic type liquid crystal touch screen.Voltage conversion circuit converts the 12V direct current of power module into 5V direct current that electromagnetic induction module can be used, and the power supply magnetic induction module is used; 5V power supply after the conversion of power module 12V direct current; Be connected to the power input mouth of electromagnetic induction module through on-off circuit; Conducting and shutoff by the USB mouth CS circuit of computing machine: when the USB of electromagnetic induction module connecting line is connected to the USB mouth of computing machine; The on-off circuit conducting, the power input mouth of electromagnetic induction module is connected electromagnetic induction module work with the 5V direct supply of being changed by the 12V direct current of electromagnetic type lcd touch display power supply module; When the USB of electromagnetic induction module connecting line was free of attachment on the computing machine USB mouth, on-off circuit turn-offed, with the power port and the disconnection of 5V direct supply of electromagnetic induction module.At this moment, the USB mouth of computing machine only provides the working current of on-off circuit to get final product, and has reduced the demand of electromagnetic induction module to computing machine USB mouth electric current significantly.
Beneficial effect
The invention has the beneficial effects as follows:
The electromagnetic induction module of electromagnetic type liquid crystal touch screen is directly supplied power without the USB mouth of computing machine; USB interface only provides the working current of the on-off circuit between power module and the electromagnetic induction module, has reduced the electric current demand of electromagnetic type liquid crystal touch screen to computing machine USB mouth.Under the situation of liquid crystal display power module energising, when the USB of electromagnetic induction module connecting line was connected with computing machine, electromagnetic induction module was started working; USB connecting line and computing machine break off, and on-off circuit is in off state, and electromagnetic induction module quits work.
Description of drawings
Fig. 1 is that the electrical equipment of existing electromagnetic type liquid crystal touch screen Liquid crystal module each several part connects synoptic diagram.
Fig. 2 is an electromagnetic type liquid crystal touch screen critical piece electrical equipment connection layout behind employing the present invention.
Fig. 3 is that the feed circuit of the electromagnetic induction module of first embodiment of the invention connect synoptic diagram.
Fig. 4 is that the feed circuit of the electromagnetic induction module of second embodiment of the invention connect synoptic diagram.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
Electrical equipment like the existing electromagnetic type liquid crystal touch screen Liquid crystal module each several part of Fig. 1 connects shown in the synoptic diagram, and the external communication electricity is respectively backlight module, A/D plate, LCD MODULE power supply after power module converts the 12V direct current into.
Shown in the electrical equipment connection layout of electromagnetic type liquid crystal touch screen after Fig. 2 adopts the present invention; The external communication electricity not only is respectively backlight module, A/D plate, the power supply of liquid crystal display piece after power module converts the 12V direct current into; And; Through voltage conversion circuit, on-off circuit, also be the electromagnetic induction module power supply.The conducting and the shutoff of USB interface CS circuit.
Shown in the electric supply installation of Fig. 3 electromagnetical type touch screen, comprise voltage conversion circuit, on-off circuit, electromagnetic induction module and USB interface.The input port IN of the output port of voltage conversion circuit and on-off circuit links to each other; The output port OUT of on-off circuit and the power input mouth of electromagnetic induction module link to each other; The control port Control of the power end of USB mouth and on-off circuit is connected, and the power input VCC of on-off circuit and the power end of USB interface link to each other.The D+ of USB interface links to each other with the corresponding data input port of electromagnetic induction module with the D-end.Voltage conversion circuit, on-off circuit, electromagnetic induction module and USB interface are connected altogether.
The power module of Liquid crystal module is connected to the input end of voltage conversion circuit with the 12V direct supply, and then the direct current of 12V converts the 5V direct current to.The 5V direct current is connected to the input end IN of on-off circuit, and the output terminal OUT of on-off circuit is connected to the power input of electromagnetic induction module, and the power input VCC of on-off circuit is connected with the power end of USB interface.
Shown in the electric supply installation of Fig. 4 electromagnetical type touch screen, comprise voltage conversion circuit, on-off circuit, electromagnetic induction module and USB interface.The defeated port IN of the output port of voltage conversion circuit and on-off circuit links to each other, and the output port OUT of on-off circuit and the power input mouth of electromagnetic induction module link to each other, and the control port Control of the power end of USB mouth and on-off circuit is connected.The power input VCC of on-off circuit and the output terminal OUT of voltage conversion circuit are connected.The D+ of USB interface links to each other with the corresponding data input port of electromagnetic induction module with the D-end.Voltage conversion circuit, on-off circuit, electromagnetic induction module and USB interface are connected altogether.
The power module of Liquid crystal module is connected to the input end of voltage conversion circuit with the 12V direct supply, and then the direct current of 12V converts the 5V direct current to.The 5V direct current is connected to the input end IN of on-off circuit, and the output terminal OUT of on-off circuit is connected to the power input of electromagnetic induction module.The on-off circuit WV is 5V, is provided by voltage conversion circuit.
First embodiment of the invention and the common principle of work of second embodiment are:
When on-off circuit did not power on, on-off circuit was in off state.After on-off circuit worked on power, its on off operating mode was by control pin Control control.Control pin Control level be high, and then on-off circuit is in opening state, after the 5V direct current is imported from input pin IN, exports electromagnetic induction module to by the output pin OUT of on-off circuit; Control pin Control level is low, and then on-off circuit is in off state.The OUT pin does not have high level output.The truth table of on-off circuit is as shown in the table.
Principle of work according to said switching circuit; When the Liquid crystal module operate as normal of electromagnetical type touch screen, the USB connecting line is connected on the computing machine, at this moment; The control signal of on-off circuit directly is connected with the power lead of USB connecting line; By computing machine 5V is provided high level, this moment, on-off circuit was in opening state, and electromagnetic induction module power input mouth has the 5V power supply; After USB line and computing machine disconnection, on-off circuit is in off state, and electromagnetic induction module loses power supply, quits work.
Adopt this device, the working current of electromagnetic induction module is provided by the liquid crystal module power module, and electromagnetic induction module can operate as normal, also reduces the output current of computing machine USB mouth significantly.
Claims (4)
1. electric supply installation that is used for electromagnetic induction module of electromagnetic liquid crystal touch screen; Form by power module, voltage conversion circuit, on-off circuit, electromagnetic induction module and USB interface; It is characterized in that; Said power module is the power module of electromagnetic type liquid crystal touch screen, is connected with voltage conversion circuit and on-off circuit between said power module and the said electromagnetic induction module, and said voltage conversion circuit converts the 12V direct current of power module into 5V direct current that electromagnetic induction module uses; Connect the power input mouth of said electromagnetic induction module, the conducting and the shutoff of said USB interface CS circuit through said on-off circuit.
2. electric supply installation according to claim 1 is characterized in that, on-off circuit and electromagnetic induction module are connected with the computing machine USB interface respectively.
3. electric supply installation according to claim 1 is characterized in that, the power end of said USB interface is connected with the control end of on-off circuit and the power input mouth VCC of on-off circuit respectively.
4. electric supply installation according to claim 2 is characterized in that, the output port of said voltage conversion circuit is connected with the input port IN of on-off circuit and the power input mouth VCC of on-off circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105385A CN101571742B (en) | 2008-04-30 | 2008-04-30 | Power supply device for electromagnetic induction module of electromagnetic liquid crystal touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105385A CN101571742B (en) | 2008-04-30 | 2008-04-30 | Power supply device for electromagnetic induction module of electromagnetic liquid crystal touch screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571742A CN101571742A (en) | 2009-11-04 |
| CN101571742B true CN101571742B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810105385A Expired - Fee Related CN101571742B (en) | 2008-04-30 | 2008-04-30 | Power supply device for electromagnetic induction module of electromagnetic liquid crystal touch screen |
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| Country | Link |
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| CN (1) | CN101571742B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841286A (en) * | 2005-03-30 | 2006-10-04 | 汉王科技股份有限公司 | Apparatus with hand-writing input and mouse functions |
| CN101135940A (en) * | 2007-09-07 | 2008-03-05 | 中国科学院计算技术研究所 | Braille computer pointing words input system, device and method thereof |
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2008
- 2008-04-30 CN CN200810105385A patent/CN101571742B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841286A (en) * | 2005-03-30 | 2006-10-04 | 汉王科技股份有限公司 | Apparatus with hand-writing input and mouse functions |
| CN101135940A (en) * | 2007-09-07 | 2008-03-05 | 中国科学院计算技术研究所 | Braille computer pointing words input system, device and method thereof |
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| Publication number | Publication date |
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| CN101571742A (en) | 2009-11-04 |
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Effective date of registration: 20180202 Address after: 100193 room 3, floor 3, building No. 5, No. 8, Wanxi Road, northeast Haidian District, Beijing Patentee after: Beijing Hanvon Saip Technology Co. Ltd. Address before: 100193 Beijing, Haidian District, northeast Wang West Road, building three, floor 5, layer 8 Patentee before: Hanwang Tech Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20200430 |