CN205541825U - Gao liangping actuating system that is shaded from sun - Google Patents
Gao liangping actuating system that is shaded from sun Download PDFInfo
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- CN205541825U CN205541825U CN201620026923.9U CN201620026923U CN205541825U CN 205541825 U CN205541825 U CN 205541825U CN 201620026923 U CN201620026923 U CN 201620026923U CN 205541825 U CN205541825 U CN 205541825U
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- drive circuit
- bright screen
- circuit
- high bright
- driving system
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Abstract
The utility model provides a gao liangping actuating system that is shaded from sun can realize the high briglt display of LCD screen, can be applied to the open air that need possess the hi -lite requirement, on -vehicle, field such as the machine carries. Gao liangping actuating system that is shaded from sun is including little control system, LED drive circuit in a poor light and supply circuit triplex. The utility model provides a gao liangping actuating system that is shaded from sun realizes LED drive circuit output current's in a poor light accurate control through little control system, and has multipath control output, the driving energy reinforce, and input voltage range is wide to reach high briglt display and realize luminance adjustable function.
Description
Technical field
This utility model relates to a kind of high bright screen backlight driving system, belongs to highlighted technical field of liquid crystal display equipment.
Background technology
Along with display device application is more and more extensive, and regular liquid crystal display has the disadvantage that 1, brightness is generally 300cd/m2Left and right, it is impossible to meet medical treatment that needs high brightness shows, airborne, boats and ships, the high-end military domain such as special vehicle；2, common driver circuit uses multilayer chiop cascade to reach the purpose of multiple-channel output, and circuit complexity is wayward, relatively costly；3, common driver circuit voltage x current output area is narrower, just cannot driven when in external LED lamp bar, LED number is more.
Utility model content
The purpose of this utility model is to overcome the technical problem that prior art brightness is too low and driving force is the strongest, it is provided that the high bright screen backlight driving system that a kind of high brightness, circuit are simple and easy to control, low cost of manufacture, voltage x current are adjustable and output area is wide, driving force is strong.
A kind of high bright screen backlight driving system, including the micro control system being electrically connected to each other, LED backlight drive circuit and power supply circuits；Described LED backlight drive circuit can external one to four paths of LEDs lamp bar, described LED lamp bar includes multiple LED strip module, described LED backlight drive circuit output voltage adjusts setting according to described LED lamp bar number and described LED strip modular structure, its maximum output voltage is 60V, and LED lamp bar electric current described in every road is arbitrary value between 50mA～150mA.
In a kind of preferred embodiment of the high bright screen backlight driving system of this utility model offer, described micro control system includes the single-chip microcomputer of the adjustable pwm pulse signal of exportable dutycycle, the described adjustable pwm pulse signal of single-chip microcomputer output duty cycle gives described LED backlight drive circuit, to control the driving current time of its output, described pwm pulse signal frequency is arbitrary value between 120Hz～1kHz.
In a kind of preferred embodiment of the high bright screen backlight driving system of this utility model offer, described LED backlight drive circuit includes driving boosting regulation chip, described driving boosting regulation chip periphery connects different valued resistor, to control the size of described LED backlight drive circuit outputting drive voltage electric current own.
In a kind of preferred embodiment of the high bright screen backlight driving system of this utility model offer, described power supply circuits can DC4.75V～15V low voltage range input, low-pressure linear manostat is used to power to whole system circuit, described power supply circuits include electric circuit inspection display lamp, for detecting the electric power thus supplied of whole circuit.
Compared to prior art, the described high bright screen backlight driving system that this utility model provides has the advantages that
One, by described micro control system, the pwm signal of described LED backlight drive circuit is controlled, and the coupling of described LED backlight drive circuit periphery difference valued resistor, electric current is allowed accurately to export, i.e. control the size of average current by the circuit turn-on time and then control the mean flow rate of backlight, realize the regulation of backlight illumination, it is adaptable to the field needing different brightness regulation to require, applied range.
Two, described LED backlight drive circuit can external one to four paths of LEDs lamp bar, operability is flexible, and the range of accommodation of voltage output simultaneously is wide, and driving force is strong, selects the LED of suitable luminosity just to can reach and is highlighted requirement.
Three, described high bright screen backlight driving system uses single-stage chip to realize multichannel driving, easy to use, low cost of manufacture, strong adaptability.
Four, described power supply circuits use DC4.75V～15V low voltage range to input to whole circuit and power, it is achieved the energy-conservation purpose of low-power consumption, the most safe and reliable.
Five, described power supply circuits have electric circuit inspection display lamp, and when circuit abnormal electrical power supply, display lamp can extinguish, real-time detecting system electric power thus supplied, it is simple to find system exception situation, have good warning function.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, accompanying drawing used in describing embodiment below is briefly described, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings, wherein:
Fig. 1 is that the high bright screen backlight driving system entirety that this utility model provides controls schematic diagram；
Fig. 2 is the micro control system circuit diagram of high bright screen backlight driving system shown in Fig. 1；
Fig. 3 is the LED backlight drive circuit figure of high bright screen backlight driving system shown in Fig. 1；
Fig. 4 is the power supply circuit of high bright screen backlight driving system shown in Fig. 1；
Fig. 5 is high bright screen backlight driving system brightness regulation schematic flow sheet shown in Fig. 1.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole embodiments.
Referring to Fig. 1, Fig. 1 is that the high bright screen backlight driving system entirety that this utility model provides controls schematic diagram.Described high bright screen backlight driving system 100 includes micro control system A, LED backlight drive circuit B and the power supply circuits C being electrically connected to each other.Micro control system A output duty cycle is adjustable, and LED backlight drive circuit B is controlled by pwm signal, and LED backlight drive circuit B arranges suitable voltage current value according to external LED lamp bar situation and is driven, and whole system is then powered by power supply circuits C.
It is the micro control system circuit diagram of high bright screen backlight driving system shown in Fig. 1 please refer to Fig. 2 and Fig. 3, Fig. 2；Fig. 3 is the LED backlight drive circuit figure of high bright screen backlight driving system shown in Fig. 1.Micro control system A uses C8051F330 single-chip microcomputer (hereinafter C8051F330), and LED backlight drive circuit B uses RT8575 chip (hereinafter RT8575).In micro control system A, pin Pin4～Pin10, Pin13～Pin20 of C8051F330 are drawn by pricking with needle J3, J4, J5, and the external LED lamp bar of J2, electric capacity C8, C9 are connected between Pin1 and ground.Pin11, Pin12 of C8051F330 is connected with Pin9, Pin10 of RT8575 respectively, RT8575 normally-open work when the Pin12 of C8051F330 exports high level, RT8575 is controlled by the pwm signal of Pin11 output 120Hz～the 1kHz different frequency of C8051F330 simultaneously, regulation pwm signal Duty ratio control current output time, i.e. control the size of average current by ON time and then control the mean flow rate of backlight, it is achieved the regulation of backlight illumination.
As shown in the LED backlight drive circuit figure that Fig. 3 provides, being connected four paths of LEDs lamp bars, drawn by pricking with needle J1 simultaneously between Pin1～Pin4 of output voltage VLED+ with RT8575, every road electric current can pass through formula: ILED≈ 900/R7 calculates, by change R7 Zhi Shimei road electric current between 50mA～150mA the most adjustable, wherein R7 one end is connected to the ground, the other end is connected with the Pin6 of RT8575, and electric capacity C1, C2 are serially connected between VLED+ and ground to suppress ripple.The driving conversion frequency of LED can adjust between 150kHz～500kHz by arranging resistance R6, fOSC≈14.3*109/ R6, R6 one end is connected to the ground, and the other end is connected with the Pin8 of RT8575, and resistance R4 and electric capacity C7 is serially connected between the Pin7 of RT8575 and ground, plays electric current and conversion frequency compensation regulation effect.External voltage VIN is through resistance R3 and C4, the Pin11 of C5, C6 electric capacity parallel network input RT8575, tandem electric inductance L1 and diode D1 between VIN and VLED+ simultaneously, the inductance L1 other end is connected with Pin12, Pin13 of RT8575, and simulation is connected by resistance R5 with digitally single-point.This LED backlight drive circuit B possesses LED short-circuit protection function, if certain external street lamp bar has short circuit phenomenon, makes Pin1～Pin4 voltage higher than 5.6V, then this passage can quit work, if all external lamp bar all short circuits, the internal boost converter of RT8575 will be closed；This LED backlight drive circuit B possesses LED break protecting; if certain external street lamp bar has breaking phenomena; making Pin1～Pin4 voltage less than 0.1V, this passage will wait external LED just can recover normally to work after connecting normally, if without connecting four, need to be connected to ground its pin.RT8575 possesses over-voltage protecting function, and once Pin16 magnitude of voltage exceedes its threshold voltage VOVPDuring=1.2V, RT8575 internal conversion then can be turned off, and then can reopen less than internal conversion during threshold voltage, wherein VLED+ ≈ VOVP* (1+R1/R2), R1 use 300k Ω resistance, can change LED backlight drive circuit B output voltage values by changing R2 value, maximum up to 60V output, wherein R1, R2 are serially connected between VLED+ and ground, in the middle of two resistance, the Pin16 with RT8575 is connected, and shunt capacitance C3 is in parallel with R2.When temperature is more than 150 DEG C simultaneously, RT8575 quits work, and when temperature is down to 130 DEG C, LED backlight drive circuit B restarts normally to work.
Refer to Fig. 4, be the power supply circuit of high bright screen backlight driving system shown in Fig. 1.nullPower supply circuits C uses low-pressure linear manostat AS1117-3.3 chip (hereinafter referred to as AS1117-3.3) to power to whole circuit，Electric circuit inspection display lamp D3 anode connects the Pin2 foot of AS1117-3.3，Electric circuit inspection display lamp D3 negative electrode concatenates ground connection after a current-limiting resistance R10，External voltage VIN inputs at the Pin3 of AS1117-3.3 through diode D2、Pin2 exports，Electric capacity C17、C18 is serially connected between the Pin3 of AS1117-3.3 and ground，Electric capacity C19、C20 is serially connected between the Pin2 of AS1117-3.3 and ground，Pricking with needle J6 is external voltage VIN input interface，Input voltage is DC4.75V～15V，Output voltage precision is up to ± 1%，Possessed stream、Overheat protective function，Electric circuit inspection display lamp D3 can detect the electric power thus supplied of whole circuit in real time，C is low in energy consumption for these power supply circuits、Safe and reliable，External load ability is strong，It can be circuit stability high efficiency power.
Refer to Fig. 5, be high bright screen backlight driving system brightness regulation schematic flow sheet shown in Fig. 1.Software elder generation initial configuration, pwm signal dutycycle starts regulation from 50%, brightness reaches requirement and then terminates, do not reach, carry out trickle being incremented by by 5%, maximum duty cycle is 96%, control the size of average current thus by ON time and then control the mean flow rate of backlight, it is achieved the regulation of backlight illumination.Compared to prior art, the described high bright screen backlight driving system 100 that this utility model provides has the advantages that
One, by described micro control system A, the pwm signal of described LED backlight drive circuit B is controlled, and the coupling of described LED backlight drive circuit B periphery difference valued resistor, electric current is allowed accurately to export, i.e. control the size of average current by the circuit turn-on time and then control the mean flow rate of backlight, realize the regulation of backlight illumination, it is adaptable to the field needing different brightness regulation to require, applied range.
Two, described LED backlight drive circuit B can external one to four paths of LEDs lamp bar, operability is flexible, and the range of accommodation of voltage output simultaneously is wide, and driving force is strong, selects the LED of suitable luminosity just to can reach and is highlighted requirement.
Three, described high bright screen backlight driving system 100 uses single-stage chip to realize multichannel driving, easy to use, low cost of manufacture, strong adaptability.
Four, described power supply circuits C uses DC4.75V～15V low voltage range to input to whole circuit and power, it is achieved the energy-conservation purpose of low-power consumption, the most safe and reliable.
Five, described power supply circuits C has electric circuit inspection display lamp D3, and when circuit abnormal electrical power supply, display lamp can extinguish, real-time detecting system electric power thus supplied, it is simple to finds system exception situation, has good warning function.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure utilizing this utility model description to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical field, within being the most in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. one kind high bright screen backlight driving system, it is characterised in that: described high bright screen backlight driving system includes micro control system, LED backlight drive circuit and the power supply circuits being electrically connected to each other；Described LED backlight drive circuit can external one to four paths of LEDs lamp bar, described LED lamp bar includes multiple LED strip module, described LED backlight drive circuit output voltage adjusts setting according to described LED lamp bar number and described LED strip modular structure, its maximum output voltage is 60V, and LED lamp bar electric current described in every road is arbitrary value between 50mA～150mA.
High bright screen backlight driving system the most according to claim 1, it is characterized in that: described micro control system includes the single-chip microcomputer of the adjustable pwm pulse signal of exportable dutycycle, the described adjustable pwm pulse signal of single-chip microcomputer output duty cycle gives described LED backlight drive circuit, to control the driving current time of its output, described pwm pulse signal frequency is arbitrary value between 120Hz～1kHz.
High bright screen backlight driving system the most according to claim 2, it is characterized in that: described LED backlight drive circuit includes driving boosting regulation chip, described driving boosting regulation chip periphery connects different valued resistor, to control the size of described LED backlight drive circuit outputting drive voltage electric current own.
High bright screen backlight driving system the most according to claim 1, it is characterized in that: described power supply circuits can DC4.75V～15V low voltage range input, low-pressure linear manostat is used to power to whole system circuit, described power supply circuits include electric circuit inspection display lamp, for detecting the electric power thus supplied of whole circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620026923.9U CN205541825U (en) | 2016-01-12 | 2016-01-12 | Gao liangping actuating system that is shaded from sun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620026923.9U CN205541825U (en) | 2016-01-12 | 2016-01-12 | Gao liangping actuating system that is shaded from sun |
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| CN205541825U true CN205541825U (en) | 2016-08-31 |
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| CN201620026923.9U Expired - Fee Related CN205541825U (en) | 2016-01-12 | 2016-01-12 | Gao liangping actuating system that is shaded from sun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473068A (en) * | 2018-12-20 | 2019-03-15 | 深圳市亿境虚拟现实技术有限公司 | A kind of head-mounted display backlight black plug control circuit and control method |
| CN112748756A (en) * | 2020-12-18 | 2021-05-04 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
-
2016
- 2016-01-12 CN CN201620026923.9U patent/CN205541825U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473068A (en) * | 2018-12-20 | 2019-03-15 | 深圳市亿境虚拟现实技术有限公司 | A kind of head-mounted display backlight black plug control circuit and control method |
| CN112748756A (en) * | 2020-12-18 | 2021-05-04 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
| CN112748756B (en) * | 2020-12-18 | 2021-11-23 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20160831 Termination date: 20210112 |