CN107635321A - 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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- CN107635321A CN107635321A CN201711021625.6A CN201711021625A CN107635321A CN 107635321 A CN107635321 A CN 107635321A CN 201711021625 A CN201711021625 A CN 201711021625A CN 107635321 A CN107635321 A CN 107635321A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention 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 regulation it is asynchronous with the exposure of VR video cameras, infrared LED operating efficiency is low, power consumption is high, inconvenient for use the problems such as.The present invention 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 present invention realizes that the regulation 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 construction, user experience is good, suitable for promoting the use of.
Description
Technical field
The present invention relates to VR video cameras field, particularly a kind of infrared LED drive circuit and the VR photographies using the circuit
Machine.
Background technology
VR (virtual reality) technology is a kind of computer simulation system that can be created with the experiencing virtual world, and 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 precision is by 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 is the regulation and the exposure of VR video cameras of infrared LED in the infrared LED drive circuit in existing VR video cameras
The problem of light is asynchronous, infrared LED operating efficiency is low, power consumption is high, greatly affected user experience, be made to people's use
Into very big inconvenience.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention provides a kind of regulation for realizing infrared LED and VR video cameras
Exposure sync, improve infrared LED operating efficiency and service life, infrared LED drive circuit low in energy consumption and using the circuit
VR video cameras.
A kind of infrared LED drive circuit, including it is pwm control circuit, sampling feedback circuit, metal-oxide-semiconductor on-off circuit, infrared
LED。
Described pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；Described control
Device U1 is the microcontroller of LT3756 series；Described resistance R1 and resistance R6 be connected in series between input power and ground and with
Controller U1 SHDN#/UVL0 ends connection；Described resistance R4 one end connection external PWM signal generator, its other end with
Controller U1 PWM ends connection；Described resistance R7 both ends respectively with controller U1 SYNC/OPENLED# ends and INTVCC
End connection.
Described sampling feedback circuit includes N-MOS pipes Q3, resistance R2, resistance R3, resistance R8 and diode D1；Described
N-MOS pipes Q3 drain electrode is connected with diode D1 anode, and its grid is connected with controller U1 GATE ends, its source electrode and control
Device U1 SENSE ends connection；Described resistance R2 one end is connected with the ISP ends of diode D1 anode and controller U1, its
The other end is connected with controller U1 ISN ends；Described resistance R3 and resistance R8 be connected in series between out-put supply and ground and
It is connected with controller U1 FB ends.
Described MOS switch circuit includes triode Q2 and P-MOS pipes Q1；Described triode Q2 base stage and controller
U1 PWMOUT ends connection, its colelctor electrode are connected with P-MOS pipes Q1 grid and P-MOS pipes Q1 source electrode, its emitter grounding；Institute
The P-MOS pipes Q1 drain electrode stated is connected with controller U1 VIN ends.
The anode of described infrared LED is connected with controller U1 ISN ends, and its negative electrode is connected with P-MOS pipes Q1 source electrode.
Preferably, described infrared LED drive circuit also includes input filter circuit；Described input filter circuit bag
Include the first input filter circuit and the second input filter circuit；The first described input filter circuit includes being parallel to input power
Electric capacity C1 and electric capacity C2 between controller U1 VIN ends；The second described input filter circuit includes being parallel to output electricity
Electric capacity C3 and electric capacity C4 between source and ground.
Preferably, described infrared LED drive circuit also includes output filter circuit；Described output filter circuit bag
Include the electric capacity C5 and electric capacity C6 being parallel between input power and ground.
Preferably, the also included resistance R10 of described pwm control circuit, resistance R12, electric capacity C7, electric capacity C8, electric capacity
C9 and inductance L1；Described resistance R10 both ends are connected with controller U1 RT ends and ground respectively；The one of described resistance R12
End is connected with controller U1 VC ends, and its other end is connected and is grounded with electric capacity C9；Described electric capacity C8 both ends respectively with control
Device U1 processed SS ends and ground connection；Described electric capacity C7 both ends are connected with the INTVCC ends of control and ground respectively；Described electricity
Sense L1 both ends are connected with diode D1 anode and input power respectively.
Preferably, described sampling feedback circuit is also connected with controller U1 SENSE ends and ground respectively including both ends
Resistance R11.
Preferably, described MOS switch circuit also includes resistance R5 and resistance R9；Described resistance R5 both ends difference
It is connected with triode Q2 colelctor electrode and P-MOS pipes Q1 source electrode；Described resistance R9 both ends are penetrated with triode Q2 respectively
Pole and ground connection.
Preferably, described 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 invention 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 regulation 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 realize the bright of infrared LED group
Degree regulation, is run so that infrared LED can obtain according to sensor devices on VR video cameras by the cooperation with metal-oxide-semiconductor on-off circuit
Time for exposure length is lighted or extinguished, and avoids infrared LED from being constantly in illuminating state, reduces power consumption, and extend red
Outer LED working life；
3) practicality of the present invention is high, and simple in construction, user experience is good, suitable for promoting the use of.
Brief description of the drawings
Fig. 1 is the circuit diagram of embodiment.
Fig. 2 is controller U1 structural representation.
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 invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include but 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 exports 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 also 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
Electric capacity C1 and electric capacity C2 between device U1 processed VIN ends, the second input filter circuit include being parallel between out-put supply and ground
Electric capacity C3 and electric capacity C4；Output filter circuit includes the electric capacity C5 and electric capacity 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 controller U1 SHDN#/
UVL0 ends are connected, specifically, resistance R1 and resistance R6 forms partial pressure, partial pressure is inputted to controller U1 SHDN#/UVL0 ends, when
Differential pressure drop is less than the PWMOUT ends of preset threshold voltage, then closing control device U1；Resistance R4 one end connection external PWM signal hair
Raw device, its other end are connected with controller U1 PWM ends, and resistance R4 effect is current limliting；Resistance R7 both ends respectively with control
Device U1 SYNC/OPENLED# ends and the connection of INTVCC ends.In the present embodiment, the also included resistance R10 of pwm control circuit, electricity
Hinder R12, electric capacity C7, electric capacity C8, electric capacity C9 and inductance L1；Resistance R10 both ends are connected with controller U1 RT ends and ground respectively；
Resistance R12 one end is connected with controller U1 VC ends, and its other end is connected and is grounded with electric capacity C9；Electric capacity C8 both ends difference
It is connected with controller U1 SS ends and ground；Electric capacity C7 both ends are connected with the INTVCC ends of control and ground respectively；The two of inductance L1
End is connected with diode D1 anode and input power 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 diode D1 anode, and its grid is connected with controller U1 GATE ends, the SENSE of its source electrode and controller U1
End connection；Resistance R2 one end is connected with diode D1 anode and controller U1 ISP ends, and its other end is with controller U1's
ISN ends connect, and thus can form voltage sample, the sampled voltage 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 controller U1 FB ends and is connected, resistance
R3 and resistance R8 form partial pressure, partial pressure input controller U1 FB ends, form feedback voltage, and the feedback voltage is constant in 1.25V,
Adjustment resistance R3 value or resistance R8 value 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 controller U1 SENSE ends and ground respectively.
Metal-oxide-semiconductor on-off circuit carries out brightness regulation to infrared LED according to switch controlling signal, and MOS switch circuit includes three
Pole pipe Q2 and P-MOS pipes Q1；Triode Q2 base stage is connected with controller U1 PWMOUT ends, its colelctor electrode and P-MOS pipes Q1
Grid and P-MOS pipes Q1 source electrode connection, its emitter grounding；P-MOS pipes Q1 drain electrode is connected with controller U1 VIN ends.
In the present embodiment, MOS switch circuit also includes resistance R5 and resistance R9；The resistance R5 both ends colelctor electrode with triode Q2 respectively
And P-MOS pipes Q1 source electrode connection；Resistance R9 both ends are connected with triode Q2 emitter-base bandgap grading and ground respectively.
The anode of infrared LED is connected with controller U1 ISN ends, and its negative electrode is connected with P-MOS pipes Q1 source electrode；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
Controller U1 ISN ends are connected to, diode D3 negative electrodes are connected to diode D5 anodes, and diode D5 negative electrodes are connected to diode D7
Anode, diode D7 negative electrodes are connected to diode D9 anodes, and diode D9 negative electrodes are connected to diode D11 anodes, diode D11
Negative electrode is connected to diode D2 anodes, and diode D2 negative electrodes are connected to diode D4 anodes, and diode D4 negative electrodes are connected to two poles
Pipe D6 anodes, diode D6 negative electrodes are connected to diode D8 anodes, and diode D8 negative electrodes are connected to diode D10 anodes, two poles
Pipe D10 negative electrodes are connected to P-MOS pipes Q1 source electrode；The series connection of 10 infrared LEDs, you can realize 10 infrared LEDs and meanwhile light with
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 preferred embodiments of the present invention are the foregoing is only, embodiment is used for structure, function and the effect for understanding invention, and
It is not used in and limits the scope of the invention.The present invention can have various modifications and variations, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
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；
Described pwm control circuit includes controller U1, resistance R1, resistance R6, resistance R4 and resistance R7；Described controller U1
For the microcontroller of LT3756 series；Described resistance R1 and resistance R6 be connected in series between input power and ground and with control
Device U1 SHDN#/UVL0 ends connection；Described resistance R4 one end connection external PWM signal generator, its other end and control
Device U1 PWM ends connection；Described resistance R7 both ends connect with controller U1 SYNC/OPENLED# ends and INTVCC ends respectively
Connect；
Described sampling feedback circuit includes N-MOS pipes Q3, resistance R2, resistance R3, resistance R8 and diode D1；Described N-
Metal-oxide-semiconductor Q3 drain electrode is connected with diode D1 anode, and its grid is connected with controller U1 GATE ends, its source electrode and controller
U1 SENSE ends connection；Described resistance R2 one end is connected with the ISP ends of diode D1 anode and controller U1, and its is another
One end is connected with controller U1 ISN ends；Described resistance R3 and resistance R8 be connected in series between out-put supply and ground and with
Controller U1 FB ends connection；
Described MOS switch circuit includes triode Q2 and P-MOS pipes Q1；Described triode Q2 base stage is with controller U1's
PWMOUT ends are connected, and its colelctor electrode is connected with P-MOS pipes Q1 grid and P-MOS pipes Q1 source electrode, its emitter grounding；Described
P-MOS pipes Q1 drain electrode is connected with controller U1 VIN ends；
The anode of described infrared LED is connected with controller U1 ISN ends, and its negative electrode is connected with P-MOS pipes Q1 source electrode.
2. infrared LED drive circuit according to claim 1, it is characterised in that also including input filter circuit；Described
Input filter circuit includes the first input filter circuit and the second input filter circuit；The first described input filter circuit includes
The electric capacity C1 and electric capacity C2 being parallel between input power and controller U1 VIN ends；The second described input filter circuit bag
Include the electric capacity C3 and electric capacity C4 being parallel between out-put supply and ground.
3. infrared LED drive circuit according to claim 2, it is characterised in that also including output filter circuit；Described
Output filter circuit includes the electric capacity C5 and electric capacity C6 being parallel between input power and ground.
4. infrared LED drive circuit according to claim 3, it is characterised in that described pwm control circuit is also included
Resistance R10, resistance R12, electric capacity C7, electric capacity C8, electric capacity C9 and inductance L1；Described resistance R10 both ends respectively with controller
U1 RT ends and ground connection；Described resistance R12 one end is connected with controller U1 VC ends, and its other end is connected with electric capacity C9
And it is grounded；Described electric capacity C8 both ends are connected with controller U1 SS ends and ground respectively；Described electric capacity C7 both ends difference
It is connected with the INTVCC ends of control and ground；Described inductance L1 both ends connect with diode D1 anode and input power respectively
Connect.
5. infrared LED drive circuit according to claim 4, it is characterised in that described sampling feedback circuit also includes
The resistance R11 that both ends are connected with controller U1 SENSE ends and ground respectively.
6. infrared LED drive circuit according to claim 5, it is characterised in that described MOS switch circuit also includes electricity
Hinder R5 and resistance R9；Described resistance R5 both ends are connected with triode Q2 colelctor electrode and P-MOS pipes Q1 source electrode respectively；Institute
The resistance R9 stated both ends are connected with triode Q2 emitter-base bandgap grading and ground respectively.
7. infrared LED drive circuit according to claim 6, it is characterised in that described 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 described infrared LED drive circuit of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711021625.6A CN107635321A (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 |
|---|---|---|---|
| CN201711021625.6A CN107635321A (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 |
|---|---|
| CN107635321A true CN107635321A (en) | 2018-01-26 |
Family
ID=61106333
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711021625.6A Pending CN107635321A (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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111435968A (en) * | 2019-01-15 | 2020-07-21 | 杭州海康威视数字技术股份有限公司 | Camera and control method thereof |
| CN112904645A (en) * | 2021-02-04 | 2021-06-04 | 成都国翼电子技术有限公司 | Low-voltage constant-power infrared illumination power supply system |
| 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 CN201711021625.6A patent/CN107635321A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111435968A (en) * | 2019-01-15 | 2020-07-21 | 杭州海康威视数字技术股份有限公司 | Camera and control method thereof |
| CN111435968B (en) * | 2019-01-15 | 2021-08-13 | 杭州海康威视数字技术股份有限公司 | Camera and control method thereof |
| CN112904645A (en) * | 2021-02-04 | 2021-06-04 | 成都国翼电子技术有限公司 | Low-voltage constant-power infrared illumination power supply system |
| 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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Effective date of registration: 20181017 Address after: 610000 Sichuan Chengdu high tech Zone two yuan Road 10 2 2 Units 1 Units 6 layers 1, 7 layer 1-2. Applicant 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 Applicant before: Chengdu Hao Yu Tao Eagle Technology Co. Ltd. |
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