CN207305008U - A kind of infrared LED drive circuit and the VR video cameras using the circuit - Google Patents
A kind of infrared LED drive circuit and the VR video cameras using the circuit Download PDFInfo
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- CN207305008U CN207305008U CN201721393088.3U CN201721393088U CN207305008U CN 207305008 U CN207305008 U CN 207305008U CN 201721393088 U CN201721393088 U CN 201721393088U CN 207305008 U CN207305008 U CN 207305008U
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Abstract
The utility model provides a kind of infrared LED drive circuit and the VR video cameras using the circuit, solve infrared LED in the infrared LED drive circuit in existing VR video cameras adjusting it is asynchronous with the exposure of VR video cameras, infrared LED work efficiency is low, power consumption is high, inconvenient for use the problems such as.The utility model includes pwm control circuit, sampling feedback circuit, metal-oxide-semiconductor on-off circuit, infrared LED；Pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；Sampling feedback circuit includes N metal-oxide-semiconductors Q3, resistance R2, resistance R3, resistance R8 and diode D1；MOS switch circuit includes triode Q2 and P metal-oxide-semiconductors Q1.The utility model realizes that the adjusting of infrared LED is synchronous with VR camera exposures, substantially increases user experience, avoids infrared LED and be constantly in illuminating state, power consumption is reduced, and extends the working life of infrared LED, practicality is high, simple in structure, user experience is good, suitable for promoting the use of.
Description
Technical field
VR video cameras field is the utility model is related to, particularly a kind of infrared LED drive circuit and the VR using the circuit
Video camera.
Background technology
VR (virtual reality) technology is a kind of computer simulation system that can be created with the experiencing virtual world, it utilizes meter
Calculation machine generates a kind of simulated environment, is imitated using the system of Multi-source Information Fusion, interactive Three-Dimensional Dynamic what comes into a driver's and entity behavior
Really user is set to be immersed in the simulated environment.
The rapid development of VR technologies so that optical locating techniques are widely used, cloth on VR video cameras shooting object
Full mark point, mark point reflection gather mark from different perspectives by the infrared light that is sent on VR video cameras, more VR video cameras
Point position, transmits it to computer, after vision algorithm filtering useless information, obtains mark point position；VR video cameras are
Most important headend equipment in optical locating techniques, its positioning accuracy are subject to infrared LED watt level and infrared light emission angle
The restriction of degree, infrared luminous power is bigger, and irradiation distance is more remote, and the ability of VR video cameras identification sensitivity speck is stronger.
But there are the adjusting and the exposure of VR video cameras of infrared LED for the infrared LED drive circuit in existing VR video cameras
The problem of light is asynchronous, infrared LED work efficiency is low, power consumption is high, greatly affected user experience, be made to people's use
Into big inconvenience.
Utility model content
Taken the photograph in view of the above-mentioned problems of the prior art, the utility model provides a kind of adjusting for realizing infrared LED with VR
Camera exposure sync, improve infrared LED work efficiency and service life, infrared LED drive circuit low in energy consumption and use the electricity
The VR video cameras on road.
A kind of infrared LED drive circuit, including it is pwm control circuit, sampling feedback circuit, metal-oxide-semiconductor on-off circuit, infrared
LED。
The pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；The control
Device U1 is the microcontroller of LT3756 series；The resistance R1 and resistance R6 be connected in series between input power and ground and with
The SHDN#/UVL0 ends connection of controller U1；The resistance R4 one end connection external PWM signal generator, its other end with
The PWM ends connection of controller U1；The both ends of the resistance R7 respectively with the SYNC/OPENLED# ends of controller U1 and INTVCC
End connection.
The sampling feedback circuit includes N-MOS pipes Q3, resistance R2, resistance R3, resistance R8 and diode D1；Described
The drain electrode of N-MOS pipes Q3 is connected with the anode of diode D1, its grid is connected with the GATE ends of controller U1, its source electrode and control
The SENSE ends connection of device U1；One end of the resistance R2 is connected with the ISP ends of the anode of diode D1 and controller U1, its
The other end is connected with the ISN ends of controller U1；The resistance R3 and resistance R8 be connected in series between out-put supply and ground and
It is connected with the FB ends of controller U1.
The metal-oxide-semiconductor on-off circuit includes triode Q2 and P-MOS pipes Q1；The base stage of the triode Q2 and control
The PWMOUT ends connection of device U1, its collector are connected with the grid of P-MOS pipes Q1 and the source electrode of P-MOS pipes Q1, its emitter grounding；
The drain electrode of P-MOS pipes Q1 is connected with the VIN ends of controller U1.
The anode of the infrared LED is connected with the ISN ends of controller U1, its cathode is connected with the source electrode of P-MOS pipes Q1.
Preferably, the infrared LED drive circuit further includes input filter circuit；The input filter circuit bag
Include the first input filter circuit and the second input filter circuit；First input filter circuit includes being parallel to input power
Capacitance C1 and capacitance C2 between the VIN ends of controller U1；Second input filter circuit includes being parallel to output electricity
Capacitance C3 and capacitance C4 between source and ground.
Preferably, the infrared LED drive circuit further includes output filter circuit；The output filter circuit bag
Include the capacitance C5 and capacitance C6 being parallel between input power and ground.
Preferably, the also included resistance R10 of the pwm control circuit, resistance R12, capacitance C7, capacitance C8, capacitance
C9 and inductance L1；The both ends of the resistance R10 are connected with the RT ends of controller U1 and ground respectively；The one of the resistance R12
End is connected with the VC ends of controller U1, its other end is connected and is grounded with capacitance C9；The both ends of the capacitance C8 respectively with control
The SS ends of device U1 processed and ground connection；The both ends of the capacitance C7 are connected with the INTVCC ends of control and ground respectively；The electricity
The both ends of sense L1 are connected with the anode and input power of diode D1 respectively.
It is connected respectively with the SENSE ends of controller U1 and ground preferably, the sampling feedback circuit further includes both ends
Resistance R11.
Preferably, the MOS switch circuit further includes resistance R5 and resistance R9；The both ends difference of the resistance R5
It is connected with the collector of triode Q2 and the source electrode of P-MOS pipes Q1；The both ends of the resistance R9 are penetrated with triode Q2 respectively
Pole and ground connection.
Preferably, the infrared LED is more than 2；Adjacent infrared LED series connection.
A kind of VR video cameras, including above-mentioned infrared LED drive circuit.
Compared with prior art, the utility model has the advantages that：
1) by pwm control circuit output pwm signal, controlled according to the pulse duty cycle of output pwm signal and frequency
The turn-on and turn-off time of metal-oxide-semiconductor on-off circuit so that realize that the adjusting of infrared LED is synchronous with VR camera exposures, practicality
Increase, substantially increases user experience；
2) output current and the size of output voltage are controlled by sampling feedback circuit, so as to fulfill the bright of infrared LED group
Degree is adjusted, and is run by the cooperation with metal-oxide-semiconductor on-off circuit so that infrared LED can be obtained according to sensor devices on VR video cameras
Time for exposure length is lighted or extinguished, and avoids infrared LED from being constantly in illuminating state, reduces power consumption, and extend red
The working life of outer LED；
3) the utility model practicality is high, and simple in structure, user experience is good, suitable for promoting the use of.
Brief description of the drawings
Fig. 1 is the circuit diagram of embodiment.
The structure diagram of Fig. 2 device U1 in order to control.
Wherein, 1- input filter circuits, 2-PWM control circuits, 3- sampling feedback circuits, 4-MOS pipe on-off circuits, 5- are red
Outer LED, 6- output filter circuit.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples, and the embodiment of the utility model includes
But it is not limited to the following example.
Embodiment
As shown in Figure 1, 2, a kind of infrared LED drive circuit, including pwm control circuit, sampling feedback circuit, metal-oxide-semiconductor are opened
Powered-down road, infrared LED, wherein, pwm control circuit receives external PWM signal, and pwm control circuit is exported according to external PWM signal
The switch controlling signal of same duty cycle and frequency, external PWM signal can be given birth to by the circuit that FPGA and peripheral cell form
Into.
In the present embodiment, infrared LED drive circuit further includes input filter circuit and output filter circuit, input filter electricity
Road is used to improve the input power of pwm control circuit and the stability of out-put supply with output filter circuit；Input filter circuit
Including the first input filter circuit and the second input filter circuit, the first input filter circuit includes being parallel to input power and control
Capacitance C1 and capacitance C2 between the VIN ends of device U1 processed, the second input filter circuit include being parallel between out-put supply and ground
Capacitance C3 and capacitance C4；Output filter circuit includes the capacitance C5 and capacitance C6 being parallel between input power and ground.
Pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；Controller U1 is LT3756
The microcontroller of series；Resistance R1 and resistance R6 be connected in series between input power and ground and with the SHDN# of controller U1/
UVL0 ends connect, specifically, resistance R1 and resistance R6 forms partial pressure, partial pressure is inputted to the SHDN#/UVL0 ends of controller U1, when
Differential pressure drop is less than the PWMOUT ends of preset threshold voltage, then closing control device U1；One end connection external PWM signal hair of resistance R4
Raw device, its other end are connected with the PWM ends of controller U1, and the effect of resistance R4 is current limliting；The both ends of resistance R7 respectively with control
The SYNC/OPENLED# ends of device U1 and the connection of INTVCC ends.In the present embodiment, the also included resistance R10 of pwm control circuit, electricity
Hinder R12, capacitance C7, capacitance C8, capacitance C9 and inductance L1；The both ends of resistance R10 are connected with the RT ends of controller U1 and ground respectively；
One end of resistance R12 is connected with the VC ends of controller U1, its other end is connected and is grounded with capacitance C9；The both ends difference of capacitance C8
It is connected with the SS ends of controller U1 and ground；The both ends of capacitance C7 are connected with the INTVCC ends of control and ground respectively；The two of inductance L1
End is connected with the anode and input power of diode D1 respectively.
Sampling feedback circuit includes N-MOS pipes Q3, resistance R2, resistance R3, resistance R8 and diode D1；N-MOS pipes Q3's
Drain electrode is connected with the anode of diode D1, its grid is connected with the GATE ends of controller U1, the SENSE of its source electrode and controller U1
End connection；One end of resistance R2 is connected with the anode of diode D1 and the ISP ends of controller U1, its other end is with controller U1's
ISN ends connect, and thus can form voltage sample, which should maintain 0.1V, it is achieved thereby that by resistance R2
Electric current realize it is constant, when resistance R2 value increase when then the sampled voltage reduce, when resistance R2 value reduce when the then sampling
Voltage increases；Resistance R3 and resistance R8 is connected in series between out-put supply and ground and with the FB ends of controller U1 and is connected, resistance
R3 and resistance R8 form partial pressure, the FB ends of partial pressure input controller U1, form feedback voltage, and the feedback voltage is constant in 1.25V,
The value of adjustment resistance R3 or the value of resistance R8 can adjust output supply voltage.In the present embodiment, sampling feedback circuit is also wrapped
Include the resistance R11 that both ends are connected with the SENSE ends of controller U1 and ground respectively.
Metal-oxide-semiconductor on-off circuit carries out brightness regulation according to switch controlling signal to infrared LED, and metal-oxide-semiconductor on-off circuit includes
Triode Q2 and P-MOS pipes Q1；The base stage of triode Q2 is connected with the PWMOUT ends of controller U1, its collector is managed with P-MOS
The source electrode connection of the grid and P-MOS pipes Q1 of Q1, its emitter grounding；The drain electrode of P-MOS pipes Q1 connects with the VIN ends of controller U1
Connect.In the present embodiment, MOS switch circuit further includes resistance R5 and resistance R9；The both ends of the resistance R5 collection with triode Q2 respectively
The source electrode of electrode and P-MOS pipes Q1 connect；The both ends of resistance R9 are connected with the emitter-base bandgap grading and ground of triode Q2 respectively.
The anode of infrared LED is connected with the ISN ends of controller U1, its cathode is connected with the source electrode of P-MOS pipes Q1；It is infrared
LED is more than 2.In the present embodiment, infrared LED is 10；Adjacent infrared LED series connection, specifically, diode D3 anodes connect
The ISN ends of controller U1 are connected to, diode D3 cathodes are connected to diode D5 anodes, and diode D5 cathodes are connected to diode D7
Anode, diode D7 cathodes are connected to diode D9 anodes, and diode D9 cathodes are connected to diode D11 anodes, diode D11
Cathode is connected to diode D2 anodes, and diode D2 cathodes are connected to diode D4 anodes, and diode D4 cathodes are connected to two poles
Pipe D6 anodes, diode D6 cathodes are connected to diode D8 anodes, and diode D8 cathodes are connected to diode D10 anodes, two poles
Pipe D10 cathodes are connected to the source electrode of P-MOS pipes Q1；The series connection of 10 infrared LEDs, you can realize 10 infrared LEDs light at the same time and
Extinguish.
A kind of VR video cameras, including above-mentioned infrared LED drive circuit, thus infrared LED can be according on VR video cameras
Sensor devices obtain time for exposure length and are lighted or extinguished, and avoid infrared LED from being constantly in illuminating state, reduce work(
Consumption, and extend the working life of infrared LED, improve the user experience of VR video cameras.
The above is only the preferred embodiment of the present invention, and embodiment is used for structure, the function for understanding utility model
And effect, the protection domain being not intended to limit the present invention.Various modifications and changes may be made to the present invention, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on, should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of infrared LED drive circuit, it is characterised in that including pwm control circuit, sampling feedback circuit, metal-oxide-semiconductor switch electricity
Road, infrared LED；
The pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；The controller U1
For the microcontroller of LT3756 series；The resistance R1 and resistance R6 be connected in series between input power and ground and with control
The SHDN#/UVL0 ends connection of device U1；One end connection external PWM signal generator of the resistance R4, its other end and control
The PWM ends connection of device U1；The both ends of the resistance R7 connect with the SYNC/OPENLED# ends of controller U1 and INTVCC ends respectively
Connect；
The sampling feedback circuit includes N-MOS pipes Q3, resistance R2, resistance R3, resistance R8 and diode D1；The N-
The drain electrode of metal-oxide-semiconductor Q3 is connected with the anode of diode D1, its grid is connected with the GATE ends of controller U1, its source electrode and controller
The SENSE ends connection of U1；One end of the resistance R2 is connected with the ISP ends of the anode of diode D1 and controller U1, its is another
One end is connected with the ISN ends of controller U1；The resistance R3 and resistance R8 be connected in series between out-put supply and ground and with
The FB ends connection of controller U1；
The metal-oxide-semiconductor on-off circuit includes triode Q2 and P-MOS pipes Q1；The base stage of the triode Q2 and controller U1
The connection of PWMOUT ends, its collector is connected with the grid of P-MOS pipes Q1 and the source electrode of P-MOS pipes Q1, its emitter grounding；It is described
The drain electrode of P-MOS pipes Q1 be connected with the VIN ends of controller U1；
The anode of the infrared LED is connected with the ISN ends of controller U1, its cathode is connected with the source electrode of P-MOS pipes Q1.
2. infrared LED drive circuit according to claim 1, it is characterised in that further include input filter circuit；Described
Input filter circuit includes the first input filter circuit and the second input filter circuit；First input filter circuit includes
The capacitance C1 and capacitance C2 being parallel between input power and the VIN ends of controller U1；The second input filter circuit bag
Include the capacitance C3 and capacitance C4 being parallel between out-put supply and ground.
3. infrared LED drive circuit according to claim 2, it is characterised in that further include output filter circuit；Described
Output filter circuit includes the capacitance C5 and capacitance C6 being parallel between input power and ground.
4. infrared LED drive circuit according to claim 3, it is characterised in that the pwm control circuit is also included
Resistance R10, resistance R12, capacitance C7, capacitance C8, capacitance C9 and inductance L1；The both ends of the resistance R10 respectively with controller
The RT ends of U1 and ground connection；One end of the resistance R12 is connected with the VC ends of controller U1, its other end is connected with capacitance C9
And it is grounded；The both ends of the capacitance C8 are connected with the SS ends of controller U1 and ground respectively；The both ends difference of the capacitance C7
It is connected with the INTVCC ends of control and ground；The both ends of the inductance L1 connect with the anode and input power of diode D1 respectively
Connect.
5. infrared LED drive circuit according to claim 4, it is characterised in that the sampling feedback circuit further includes
The resistance R11 that both ends are connected with the SENSE ends of controller U1 and ground respectively.
6. infrared LED drive circuit according to claim 5, it is characterised in that the MOS switch circuit further includes electricity
Hinder R5 and resistance R9；The both ends of the resistance R5 are connected with the collector of triode Q2 and the source electrode of P-MOS pipes Q1 respectively；Institute
The both ends of the resistance R9 stated are connected with the emitter-base bandgap grading and ground of triode Q2 respectively.
7. infrared LED drive circuit according to claim 6, it is characterised in that the infrared LED is more than 2；Phase
Adjacent infrared LED series connection.
8. a kind of VR video cameras, it is characterised in that including any infrared LED drive circuit of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721393088.3U CN207305008U (en) | 2017-10-26 | 2017-10-26 | A kind of infrared LED drive circuit and the VR video cameras using the circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721393088.3U CN207305008U (en) | 2017-10-26 | 2017-10-26 | A kind of infrared LED drive circuit and the VR video cameras using the circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207305008U true CN207305008U (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721393088.3U Active CN207305008U (en) | 2017-10-26 | 2017-10-26 | A kind of infrared LED drive circuit and the VR video cameras using the circuit |
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| CN (1) | CN207305008U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225870A (en) * | 2021-03-29 | 2021-08-06 | 青岛小鸟看看科技有限公司 | VR (virtual reality) equipment positioning method and VR equipment |
-
2017
- 2017-10-26 CN CN201721393088.3U patent/CN207305008U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225870A (en) * | 2021-03-29 | 2021-08-06 | 青岛小鸟看看科技有限公司 | VR (virtual reality) equipment positioning method and VR equipment |
| CN113225870B (en) * | 2021-03-29 | 2023-12-22 | 青岛小鸟看看科技有限公司 | VR equipment positioning method and VR equipment |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181025 Address after: 610000 Sichuan Chengdu high tech Zone two yuan Road 10 2 2 Units 1 Units 6 layers 1, 7 layer 1-2. Patentee after: CHENGDU GUOYI ELECTRONIC TECHNOLOGY CO., LTD. Address before: 610000 Sichuan Chengdu high tech Zone two Garden Road 10 10 2 Building 6 level 2 Patentee before: Chengdu Hao Yu Tao Eagle Technology Co. Ltd. |
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| TR01 | Transfer of patent right |