CN105429247B - A kind of charging device of VR glasses and mobile terminal - Google Patents

A kind of charging device of VR glasses and mobile terminal Download PDF

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Publication number
CN105429247B
CN105429247B CN201610017995.1A CN201610017995A CN105429247B CN 105429247 B CN105429247 B CN 105429247B CN 201610017995 A CN201610017995 A CN 201610017995A CN 105429247 B CN105429247 B CN 105429247B
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Prior art keywords
mobile terminal
glasses
voltage
charging
external
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CN105429247A (en
Inventor
李刚
张丰学
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Shenzhen Dlodlo Technologies Co Ltd
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Shenzhen Dlodlo Technologies Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0027
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention discloses a kind of charging device of VR glasses and mobile terminal, including:Mobile terminal USB interface, VR glasses charging inlet, external powering device;Mobile terminal USB interface is powered by external powering device to VR glasses;Or mobile terminal USB interface electrically connects with VR glasses charging inlets, mobile terminal is set to be powered to VR glasses;ID switch units electrically connect with mobile terminal connection jaws and VR glasses terminated line mouths respectively;ID switch units adjust external reference voltages for mobile terminal charging voltage and VR glasses supply voltages, and give mobile terminal to charge by mobile terminal connection jaws, give VR glasses to power by VR glasses terminated line mouths.Avoid because diode impedance is high, pressure drop can be produced by passing the current through diode, cause can not filling electricity to the brownout of mobile terminal, and user can also be allowed to play game while charging.

Description

A kind of charging device of VR glasses and mobile terminal
Technical field
The present invention relates to VR eyewear arts, more particularly to the charging device of a kind of VR glasses and mobile terminal.
Background technology
USB charging inlets are provided with outside VR glasses, in brownout, it is possible to achieve charge function.Generally, hand Machine is connected with VR glasses, main board power supply of the mobile phone by USB interface for VR glasses.When mobile phone electric power deficiency, VR can be passed through USB interface on glasses is connected with external power source, and electric current is entered by USB interface, while charging for mobile phone, gives VR glasses to supply Electricity.
Traditional way is to install diode in charging inlet position, can produce one-way conduction, reverse cutoff function, but Diode can produce pressure drop and power consumption, and electric current process can produce 0.35V pressure drops, and mobile phone terminal and the voltage at VR glasses end can be made low In 4.5V, lead to not be charged.
The content of the invention
It is whole with movement it is an object of the present invention to provide a kind of VR glasses in order to overcome above-mentioned deficiency of the prior art The charging device at end, including:Mobile terminal USB interface, VR glasses charging inlet, external powering device;
The external powering device includes:Mobile terminal connection jaws, VR glasses terminated lines mouth, external power connection jaws and ID Switch unit;
The mobile terminal USB interface electrically connects with the mobile terminal connection jaws, the VR glasses charging inlet and institute The electrical connection of VR glasses terminated lines mouth is stated, the mobile terminal USB interface is powered by the external powering device to VR glasses;Or The mobile terminal USB interface electrically connects with the VR glasses charging inlet, mobile terminal is powered to VR glasses;
The ID switch units output end electrically connects with mobile terminal connection jaws and VR glasses terminated line mouths respectively, described outer Power supply wiring mouth output end is electrically connected with ID switch unit inputs, and external power connection jaws input is connected with external power, and ID is cut Change unit to be used to adjust external reference voltages for mobile terminal charging voltage and VR glasses supply voltages, and pass through mobile terminal Connection jaws charge to mobile terminal, are powered by VR glasses terminated line mouths to VR glasses.
Preferably, in addition to:Controlling switch;
The input of the controlling switch electrically connects with external powering device, the output end of the controlling switch respectively with shifting Dynamic terminal USB interface, the electrical connection of VR glasses charging inlet, the controlling switch are used to control external powering device and movement respectively Break-make between terminal and between control external powering device and VR glasses.
Preferably, in addition to:Voltage-stablizer;
The voltage-stablizer electrically connects with VR glasses terminated line mouths, for make VR glasses terminated line mouths by the voltage-stablizer with Mobile terminal USB interface electrically connects, or make VR glasses terminated lines mouth respectively by the voltage-stablizer and the controlling switch with it is outer Portion's electric supply installation electrical connection.
Preferably, the mobile terminal is provided with energy storage equipment, OTG modules and AOA modules;
The OTG modules of the mobile terminal are used to power to VR glasses;
The AOA modules of the mobile terminal are used to charge to energy storage equipment.
Preferably, the AOA modules are provided with charging circuit, and charging circuit includes:FET one, FET two, electricity Sense and electric capacity three;
The inductance and electric capacity three form LC oscillating circuits;
The drain electrode of FET one is connected with the grid of FET two, the source ground of FET one, field effect Should the source electrode of pipe two electrically connected with energy storage equipment, the drain electrode of FET two passes through LC oscillating circuits and mobile terminal USB interface Connection.
Preferably, the ID switch units include:Voltage high module;
The voltage high module is used to work as external power by external power connection jaws access external powering device, makes mobile whole Terminated line mouth voltage raises, and external power charges to mobile terminal.
Preferably, the ID switch units include:Power supply module;
The power supply module is used to work as external power by external power connection jaws access external powering device, passes through external power VR glasses terminated line mouths are powered to VR glasses.
Preferably, the ID switch units include:Voltage pull-down module;
The voltage pull-down module is used for when mobile terminal connection jaws voltage is pulled low, and the mobile terminal gives VR eyes Mirror is powered.
Preferably, the mobile terminal is mobile phone or notebook or tablet personal computer or POS or vehicle-mounted computer.
As can be seen from the above technical solutions, the present invention has advantages below:
Mobile terminal USB interface is powered by external powering device to VR glasses, the ID switch units of external powering device Electrically connected respectively with mobile terminal connection jaws and VR glasses terminated line mouths;ID switch units adjust external reference voltages to be mobile whole Charging voltage and VR glasses supply voltages are held, and is charged by mobile terminal connection jaws to mobile terminal, is terminated by VR glasses Line mouth is powered to VR glasses, and this avoid due to diode impedance height, pressure drop can be produced by passing the current through diode, be caused The brownout of mobile terminal and can not fill electricity, can also allow user can play game while charging.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required accompanying drawing used in description will be made below simple Ground introduction, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill For personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the overall schematic of the charging device of VR glasses and mobile terminal;
Fig. 2 is the embodiment schematic diagram of the charging device of VR glasses and mobile terminal;
Fig. 3 is the embodiment schematic diagram of VR glasses and mobile terminal;
Fig. 4 is the circuit diagram of mobile terminal data transmission circuit;
Fig. 5 is the circuit diagram of mobile terminal charging circuit.
Embodiment
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, will use below specific Embodiment and accompanying drawing, the technical scheme protected to the present invention are clearly and completely described, it is clear that implementation disclosed below Example is only part of the embodiment of the present invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this area All other embodiment that art personnel are obtained under the premise of creative work is not made, belong to the model of this patent protection Enclose.
The present embodiment provides a kind of charging device of VR glasses and mobile terminal, as shown in figure 1, including:Mobile terminal USB Interface 1, VR glasses charging inlet 3, external powering device 2;
External powering device 2 includes:Mobile terminal connection jaws 21, VR glasses terminated lines mouth 22, external power connection jaws 24 with And ID switch units 23;
Mobile terminal USB interface 1 electrically connects with mobile terminal connection jaws 21, and VR glasses charging inlet 3 terminates with VR glasses Line mouth 22 is electrically connected, and mobile terminal USB interface 1 is powered by external powering device 2 to VR glasses;Or mobile terminal USB interface 1 Electrically connected with VR glasses charging inlet 3, mobile terminal is powered to VR glasses;
It is understood that mobile terminal includes two kinds to VR glasses power supply mode, one kind is mobile terminal USB interface 1 Electrically connected with VR glasses charging inlet 3;Another kind is that mobile terminal and VR glasses are connected with external powering device 2 respectively, is passed through External powering device 2 makes mobile terminal be powered to VR glasses.
ID switch units electrically connect with mobile terminal connection jaws 21 and VR glasses terminated lines mouth 22 respectively;
The output end of external power connection jaws 24 electrically connects with ID switch units 23, the input of external power connection jaws 24 and external power 25 connections, ID switch units 23 are used to adjust external reference voltages for mobile terminal charging voltage and VR glasses supply voltages, And charged by mobile terminal connection jaws 21 to mobile terminal, powered by VR glasses terminated lines mouth 22 to VR glasses.So keep away Exempt from because diode impedance is high, pressure drop can be produced by passing the current through diode, cause to fill to the brownout of mobile terminal Do not enter electricity.
In the present embodiment, mobile terminal includes mobile phone, notebook, tablet personal computer, POS and vehicle-mounted computer.
In the present embodiment, as shown in Figure 2 and Figure 3, in addition to:Controlling switch 4;
The input of controlling switch 4 electrically connects with external powering device 2, and the output end of controlling switch 4 is whole with movement respectively End usb 1, VR glasses charging inlet 3 electrically connect, and controlling switch 4 is used to control external powering device 2 and mobile terminal respectively Between and control external powering device 2 and VR glasses between break-make.
Controlling switch 4 is using power switch IC.
In the present embodiment, in order to ensure voltage stability that mobile terminal is powered to VR glasses, ensure that VR glasses are stable and transport OK, in addition to:Voltage-stablizer 5;Voltage-stablizer 5 electrically connects with VR glasses terminated lines mouth 3, for making VR glasses terminated line mouths 3 by steady Depressor 5 electrically connects with mobile terminal USB interface 1, or VR glasses terminated lines mouth 3 is passed through voltage-stablizer 5 and VR glasses terminated lines mouth 3 Electrical connection, or VR glasses terminated lines mouth 3 is electrically connected by voltage-stablizer 5 with controlling switch 4.
In the present embodiment, ID switch units 23 include:Voltage high module;
Voltage high module is used to work as external power 25 by the access external powering device 2 of external power connection jaws 24, makes movement The voltage of terminal connection mouth 1 raises, and external power 25 charges to mobile terminal.
Specifically, when the voltage of mobile terminal is less than given threshold, mobile terminal is under-voltage condition, it is necessary to mobile whole Charged at end.Because mobile terminal is less than given threshold, the power supply of VR glasses can not be given.External power 25 passes through external power wiring Mouth 24 accesses external powering devices 2, raises the voltage of mobile terminal connection jaws 1, and external power 25 charges to mobile terminal.
ID switch units 23 include:Power supply module;Power supply module is used for when external power 25 is connect by external power connection jaws 24 Enter external powering device 2, external power 25 is powered by VR glasses terminated lines mouth 3 to VR glasses.
While external power 25 charges to mobile terminal, make external power 25 by VR glasses terminated lines mouth 3 to VR eyes Mirror is powered.Specifically, external power 25 is distinguished to the supply voltage of VR glasses the charging voltage and external power 25 of mobile terminal Partial pressure is carried out by ID switch units 23, charging voltage is met the charging voltage of mobile terminal, supply voltage meets VR glasses Supply voltage.
In the present embodiment, ID switch units include:Voltage pull-down module;The voltage pull-down module is used to work as mobile terminal When connection jaws voltage is pulled low, the mobile terminal is powered to VR glasses.
In the present embodiment, data transmission circuit such as Fig. 4, including:Transistor Q1, the R3 of resistance three, the R4 of resistance four;Transistor Q1 Base stage and the control module of mobile terminal are connected, and transistor Q1 emitter stages are grounded by the R3 of resistance three;Transistor Q1 colelctor electrodes lead to Cross the R4 of resistance four ground connection.
Transistor Q1 base stage and the control chip of mobile terminal connect, and make transistor Q1 according to mobile terminal control chip Control, to VR glasses send video data.
In the present embodiment, as shown in figure 5, AOA modules are provided with charging circuit, charging circuit includes:FET 1, field Effect pipe 2 13, inductance L and the C3 of electric capacity three;The inductance L and C3 of electric capacity three composition LC oscillating circuits;The inductance L and C3 of electric capacity three compositions When LC oscillating circuits can make the external power be charged to mobile terminal, the ripple of charging voltage is reduced, ensures the stability of voltage.
The drain electrode of FET 1 is connected with the grid of FET 2 13, the source ground of FET 1, field-effect The source electrode of pipe 2 13 electrically connects with energy storage equipment 11, and the drain electrode of FET 2 13 passes through LC oscillating circuits and mobile terminal USB Interface 1 connects.
The grid of FET 1 and the control chip of mobile terminal connect.Under non-charged state, FET two 13 disconnect, when the control chip of mobile terminal detects that mobile terminal USB interface 1 is provided with charging voltage, the control of mobile terminal Chip controls FET 1 turns on, and FET 1 turns on FET 2 13, and charging current passes through FET 2 13 give the energy storage equipment charging of mobile terminal.When energy storage equipment charging reaches setting electricity, the control core of mobile terminal Piece control FET 1 disconnects, and FET 1 controls FET 2 13 to disconnect, and external power 25 is stopped to movement The charging of terminal.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other The difference of embodiment, identical similar portion refers to mutually between each embodiment.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one The most wide scope caused.

Claims (7)

  1. A kind of 1. charging device of VR glasses and mobile terminal, it is characterised in that including:Mobile terminal USB interface, VR glasses fill Electrical interface, external powering device;
    The external powering device includes:Mobile terminal connection jaws, VR glasses terminated lines mouth, external power connection jaws and ID switchings Unit;
    The mobile terminal USB interface electrically connects with the mobile terminal connection jaws, the VR glasses charging inlet and the VR Glasses terminated line mouth is electrically connected, and the mobile terminal USB interface is powered by the external powering device to VR glasses;It is or described Mobile terminal USB interface electrically connects with the VR glasses charging inlet, mobile terminal is powered to VR glasses;
    The ID switch units output end electrically connects with mobile terminal connection jaws and VR glasses terminated line mouths respectively, the external power Connection jaws output end is electrically connected with ID switch unit inputs, and external power connection jaws input is connected with external power, and ID switchings are single Member is used to adjust external reference voltages for mobile terminal charging voltage and VR glasses supply voltages, and passes through mobile terminal wiring Mouth gives mobile terminal to charge, and gives VR glasses to power by VR glasses terminated line mouths;
    The ID switch units include:Voltage high module;
    The voltage high module is used to work as external power by external power connection jaws access external powering device, connects mobile terminal Line mouth voltage raises, and external power charges to mobile terminal;
    The ID switch units include:Voltage pull-down module;
    The voltage pull-down module is used for when mobile terminal connection jaws voltage is pulled low, and the mobile terminal supplies to VR glasses Electricity.
  2. 2. the charging device of VR glasses according to claim 1 and mobile terminal, it is characterised in that
    Also include:Controlling switch;
    The input of the controlling switch electrically connects with external powering device, and the output end of the controlling switch is whole with movement respectively USB interface, the electrical connection of VR glasses charging inlet are held, the controlling switch is used to control external powering device and mobile terminal respectively Between and control external powering device and VR glasses between break-make.
  3. 3. the charging device of VR glasses according to claim 2 and mobile terminal, it is characterised in that
    Also include:Voltage-stablizer;
    The voltage-stablizer electrically connects with VR glasses terminated line mouths, for making VR glasses terminated line mouths pass through the voltage-stablizer and movement Terminal USB interface electrically connects, or VR glasses terminated lines mouth is supplied respectively by the voltage-stablizer and the controlling switch with outside Electric installation electrically connects.
  4. 4. the charging device of VR glasses according to claim 1 and mobile terminal, it is characterised in that
    The mobile terminal is provided with energy storage equipment, OTG modules and AOA modules;
    The OTG modules of the mobile terminal are used to power to VR glasses;
    The AOA modules of the mobile terminal are used to charge to energy storage equipment.
  5. 5. the charging device of VR glasses according to claim 4 and mobile terminal, it is characterised in that
    The AOA modules are provided with charging circuit, and charging circuit includes:FET one, FET two, inductance and electric capacity three;
    The inductance and electric capacity three form LC oscillating circuits;
    The drain electrode of FET one is connected with the grid of FET two, the source ground of FET one, FET Two source electrode is electrically connected with energy storage equipment, and the drain electrode of FET two is connected by LC oscillating circuits with mobile terminal USB interface.
  6. 6. the charging device of VR glasses according to claim 1 and mobile terminal, it is characterised in that
    The ID switch units include:Power supply module;
    The power supply module is used to work as external power by external power connection jaws access external powering device, external power is passed through VR eyes Jing Duanjiexiankou powers to VR glasses.
  7. 7. the charging device of VR glasses according to claim 1 and mobile terminal, it is characterised in that
    The mobile terminal is mobile phone or notebook or tablet personal computer or POS or vehicle-mounted computer.
CN201610017995.1A 2016-01-12 2016-01-12 A kind of charging device of VR glasses and mobile terminal Active CN105429247B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610017995.1A CN105429247B (en) 2016-01-12 2016-01-12 A kind of charging device of VR glasses and mobile terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610017995.1A CN105429247B (en) 2016-01-12 2016-01-12 A kind of charging device of VR glasses and mobile terminal

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017120752A1 (en) * 2016-01-12 2017-07-20 深圳多哚新技术有限责任公司 Charging apparatus for vr glasses and mobile terminal
CN108369447B (en) * 2016-04-13 2021-06-29 华为技术有限公司 Method and device for controlling running state of wearable electronic equipment
CN105871008A (en) * 2016-04-26 2016-08-17 乐视控股(北京)有限公司 Virtual reality equipment-based charging method and device
CN105827010B (en) 2016-05-30 2019-04-05 青岛歌尔声学科技有限公司 A kind of audio frequency apparatus power supply system
CN106059012B (en) 2016-07-29 2019-08-02 北京小鸟看看科技有限公司 One kind wearing display power supply system
CN106253372B (en) * 2016-07-29 2019-07-19 北京小鸟看看科技有限公司 A kind of power supply unit
CN106095007A (en) * 2016-07-29 2016-11-09 北京小鸟看看科技有限公司 One wears display device
CN106253371A (en) * 2016-07-29 2016-12-21 北京小鸟看看科技有限公司 One wears display electric power system
CN106786902A (en) * 2016-12-26 2017-05-31 北京小鸟看看科技有限公司 A kind of power supply switch circuit and virtual reality device
CN113050793A (en) * 2021-03-24 2021-06-29 Oppo广东移动通信有限公司 Near-to-eye display control method, near-to-eye display control device and intelligent equipment

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090028196A (en) * 2007-09-14 2009-03-18 삼성전자주식회사 Apparatus and method for charging in mobile phone
CN101315576A (en) * 2008-06-30 2008-12-03 上海序参量科技发展有限公司 Laptop electric power machine with mobile phone charging interface
CN203773468U (en) * 2014-04-06 2014-08-13 浙江海洋学院 Novel laptop power adapter
CN204615444U (en) * 2015-04-28 2015-09-02 高创(苏州)电子有限公司 Panel computer
CN204928266U (en) * 2015-09-01 2015-12-30 宁波创付电气有限公司 General voltage adapter
CN205355865U (en) * 2016-01-12 2016-06-29 深圳多哚新技术有限责任公司 VR glasses and mobile terminal's charging device

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