CN208507169U - A kind of constant current driving system for television backlight LED - Google Patents
A kind of constant current driving system for television backlight LED Download PDFInfo
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- CN208507169U CN208507169U CN201821213692.8U CN201821213692U CN208507169U CN 208507169 U CN208507169 U CN 208507169U CN 201821213692 U CN201821213692 U CN 201821213692U CN 208507169 U CN208507169 U CN 208507169U
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Abstract
The utility model discloses a kind of constant current driving systems for television backlight LED, including boost module, multi-channel PWM module, master controller, current feedback module and voltage feedback module, multiple pulse width modulating signals can be generated in multi-channel PWM module, quantity corresponding to LED load, simultaneously by current feedback module and voltage feedback module come to LED load electric current and voltage be configured, operating voltage needed for input power is raised to LED load by boost module, it realizes to different numbers, the operating voltage of the LED load of different size, the adjustment of electric current, it can satisfy the requirement with various sizes of TV display screen to constant current driver circuit for LED, and it can be according to extraneous brightness come the intelligent brightness for adjusting backlight of television, guarantee that the brightness of backlight of television will not influence To human eye.
Description
Technical field
The utility model relates to field of display technology, especially a kind of constant current driving system for television backlight LED.
Background technique
LCD TV is obtaining high volume applications using LED as backlight in recent years, but industry none unified mark
Standard, it is in addition different using the specification of LED light and the size of screen, so lamp bar number, voltage, electric current required for every money screen
All variant, this just needs that different chips is selected to go to design and develop the constant-current drive circuit for meeting the screen, with LED light and screen
The specification of curtain is more and more, and the kind of constant-current drive circuit also can be more and more, in newly screen development phase and damage constant current after sale
The maintenance replacement of driving plate is all very inconvenient, and the exploitation various in style and with new architecture of inefficiency, stock can make the problem
It is more and more significant, also, the backlight illumination of television set is that manpower is needed to be adjusted at present, is unfamiliar with electronics production for some
It is relatively complicated for the elderly of product.
Utility model content
To solve the above problems, the purpose of this utility model is to provide a kind of constant current drivings for television backlight LED
The control to the electric current and voltage of different numbers, different size LED load may be implemented in system, to meet various sizes of liquid
Requirement of the brilliant tv display screen to constant-current drive circuit, while can be according to the brightness of extraneous bright automatic adjustment load.
The technical solution adopted by the utility model to solve the problem is as follows:
A kind of constant current driving system for television backlight LED, comprising:
Boost module provides operating voltage for connecting with power supply and LED load anode for LED load；
Master controller, for carrying out boosting rectifier control to boost module；
Multi-channel PWM module, for exporting pulse width modulating signal identical with LED load quantity；
Current feedback module, for acquire boost module export the electric current to LED load and be output to master controller carry out
Feedback；
Voltage feedback module, for acquire boost module export the voltage to LED load and be output to master controller carry out
Feedback；
Light detection module, for acquiring extraneous bright and the information of acquisition being transferred to main control；
The master controller is connect with boost module, multi-channel PWM module, current feedback module, voltage feedback module respectively,
The master controller includes that the pwm signal of boost terminal, current feedback terminal, overvoltage protection end and quantity identical as LED load is defeated
Entering end and light adjustable side, the boost module is connect with boost terminal, and the multi-channel PWM module is connect with pwm signal input terminal,
The current feedback module is connect with current feedback terminal, and the voltage feedback module is connect with overvoltage protection end, the light detection
Module is connect with light adjustable side.
It further, further include the LED current balance being connect with the cathode of LED load for balancing LED load operating current
Module, the LED current balance module are connect with master controller.
Further, the master controller further includes current detecting identical with LED load quantity end, and the LED current is flat
Weighing apparatus module is connect with current detecting end.
Further, the master controller further includes current compensation identical with LED load quantity end, and the LED current is flat
Weighing apparatus module is connect with current compensation end.
Further, the multi-channel PWM module includes PWM generator for generating pwm signal and PWM generator is raw
At PWM wave be divided into quantity identical as load PWM wave channel module, the PWM generator includes pwm signal output end,
The pwm signal output end is connect with channel module.
It further, further include the electricity of the power input being connect with external power supply and output services voltage to LED load
Source output terminal, the power input are connect with boost module, multi-channel PWM module, master controller respectively, the power output end
It is connect respectively with current feedback module, voltage feedback module.
Further, the boost module includes boosting rectifier control end and input terminal, the input terminal and electricity of the boost module
The boost terminal of the connection of source input terminal, the boosting rectifier control end and master controller connects.
Further, the boost module includes BOOST booster circuit.
The beneficial effects of the utility model are: a kind of constant current for television backlight LED that the utility model uses drives
System, multi-channel PWM module generate multiple pulse width modulating signals, corresponding to the quantity of LED load, while passing through current feedback
Module and voltage feedback module come to LED load electric current and voltage be configured, realize to different numbers, different size
The adjustment of the operating voltage, electric current of LED load can satisfy and drive with various sizes of TV display screen to LED constant current
The requirement of circuit, and can guarantee backlight of television according to extraneous brightness come the intelligent brightness for adjusting backlight of television
Brightness do not interfere with human eye.
Detailed description of the invention
The utility model is described in further detail with example with reference to the accompanying drawing.
Fig. 1 is a kind of schematic diagram of the constant current driving system for television backlight LED of the utility model；
Fig. 2 is a kind of circuit of the multi-channel PWM module of the constant current driving system for television backlight LED of the utility model
Figure.
Specific embodiment
Referring to Fig.1, a kind of constant current driving system for television backlight LED of the utility model, including boost module 1,
Master controller 2, multi-channel PWM module 3, current feedback module 4, voltage feedback module 5, light detection module 6, LED current balance mould
Block 7, power input 8 and power output end 9, power input 8 are used to extraneous power input arriving the utility model
In constant current driving system, play provide power supply function, wherein power input 8 respectively with multi-channel PWM module 3, master controller 2
And boost module 1 connects, and power output end 9 is the output port of entire circuit, is born for operating voltage to be transferred to LED
It carries, boost module 1 is connected to the positive terminal of LED load by power output end 9, and it is negative that LED current balance module 7 is connected to LED
The negative pole end of load.
The master controller 2 of the utility model controls electric current, voltage, is specifically presented as, 4 He of current feedback module
Voltage feedback module 5 acquires the voltage and current of power output end 9 respectively and is transferred in master controller 2, and master controller 2 passes through
Current feedback terminal 22 and current feedback module 4 connect, and are connect by overvoltage protection end 23 with voltage feedback module 5, master controller 2
The voltage and current information that voltage feedback module 5 and current feedback module 4 are fed back is received to adjust the work of multiple LED loads
Electric current and operating voltage are realized and are controlled the electric current and voltage of LED load.
Light detection module 6 acquires the light of external environment simultaneously, and collected information is transferred to by light adjustable side 25
Master controller 2, master controller 2 handles the information received, if ambient light is stronger, adjusts load reduction brightness, if
Ambient light is weaker, then adjusts load and brightness is turned up, and realizes that the intelligent effect for adjusting backlight, light detection module 6 can use light
The either other light-sensitive devices of quick resistance need for photo resistance to be placed in outside television set when being applied in television set, side
Just it perceives ambient light.
In order to further strengthen the feedback control to LED load, the utility model is provided with LED current balance module 7, right
That answers is provided with current detecting end 26 and current compensation end 27 on master controller 2, due to the quantity not just one of LED load
It is a, the current detecting end 26 and current compensation end 27 be also provided with into it is identical as LED load quantity, it is corresponding can be with feedback control
With each LED load of compensation, LED current balance module 7 and current detecting end 26 all on master controller 2, current compensation
27 connection of end, the balance of the operating current to multiple LED loads is realized by master controller 2.
In order to control switch time and the brightness of each LED load, multi-channel PWM module 3 include PWM generator 31 and
Channel module 32, PWM generator 31 include pwm signal output end 311, the pulse width modulating signal that PWM generator 31 generates
It is output in channel module 32 by pwm signal output end 311, channel module 32 is connect with power input 8, channel module 32
Pwm signal is handled, single pwm signal is divided into multi-channel PWM signal identical with LED load quantity, and respectively
The transmission for controlling the pulse width modulating signal in each channel, it is corresponding on master controller 2 to be provided with number identical as LED load
The pwm signal input terminal 24 of amount, channel module 32 are connect by pwm signal input terminal 24 with master controller 2, are realized negative to LED
The brightness of load and the control of switch time.
Specifically, the boost module 1 of the utility model is using BOOST booster circuit comprising boosting rectifier control end
11 and input terminal 12, wherein input terminal 12 is connect with power input 8, for receiving the power supply of the transmission of power input 8, and
Operating voltage needed for obtaining LED load after boosting to the voltage received, last boost module 1 pass through power output end
9 export operating voltage to LED load, realize power supply.
Master controller 2 is connect with the boosting rectifier control end 11 of boost module 1 simultaneously, for carrying out boosting control to boost module 1
Make and realize that constant current output, master controller 2 can be controlled using common some current constant control chips on the market.
The utility model by the control of 3 pulse-width modulated signal of multi-channel PWM module and by master controller 2,
Current feedback module 4, voltage feedback module 5 are configured the electric current and voltage of LED load, realize to different numbers, difference
The adjustment of the operating current and voltage of specification LED load is driven with meeting various sizes of TV display screen to LED constant current
The requirement of circuit solves the requirement that available liquid crystal TV constant current driver circuit for LED is not able to satisfy different screen size.
Referring to the circuit diagram of multi-channel PWM module 3 shown in Fig. 2, wherein channel module 32 includes divider resistance R1, partial pressure electricity
Hinder R2, divider resistance R3, divider resistance R4, divider resistance R5, divider resistance R6, the first wire jumper JP1, the second wire jumper JP2, third
Wire jumper JP3, the forth jump line JP4, the fifth jump line JP5, the 6th wire jumper JP6；The of the first end of divider resistance R1, divider resistance R2
The first end of one end, the first end of divider resistance R3 and divider resistance R4 is connected to the first end and partial pressure electricity of divider resistance R5 altogether
Hinder input terminal of the first end as channel module 32 of R6, the second end of divider resistance R1 respectively with the first arteries and veins of master controller 2
Rush bandwidth modulation signals end PWM1 and the first wire jumper JP1 first end connection, the second end of divider resistance R2 respectively with main control
The first end of the second pulse width modulating signal end PWM2 and the second wire jumper JP2 of device 2 connect, the second end point of divider resistance R3
It is not connect with the first end of the third pulse width modulating signal end PWM3 of master controller 2 and third wire jumper JP3, divider resistance R4
Second end connect respectively with the first end of the 4th pulse width modulating signal end PWM4 of master controller 2 and the forth jump line JP4,
The second end of divider resistance R5 is respectively with the 5th pulse width modulating signal end PWM5's of master controller 2 and the fifth jump line JP5
First end connection, the second end of divider resistance R6 respectively with the 6th pulse width modulating signal end PWM6 of master controller 2 and the
The first end of six wire jumper JP6 connects, the second end of the first wire jumper JP1, the second end of the second wire jumper JP2, third wire jumper JP3 the
Two ends, the second end of the forth jump line JP4, the second end of the second end of the fifth jump line JP5 and the 6th wire jumper JP6 are connected to ground altogether.
Specifically, the master controller 2 of the utility model can be controlled using single-chip microcontroller, the pin function of single-chip microcontroller
It can correspond to each control terminal of master controller 2, precise control, processing speed is also very fast.
The above, the only preferred embodiment of the utility model, the utility model are not limited to above-mentioned implementation
Mode, as long as its technical effect for reaching the utility model with identical means, all should belong to the protection scope of the utility model.
Claims (8)
1. a kind of constant current driving system for television backlight LED, it is characterised in that: include:
Boost module (1) provides operating voltage for connecting with power supply and LED load anode for LED load；
Master controller (2), for carrying out boosting rectifier control to boost module (1)；
Multi-channel PWM module (3), for exporting pulse width modulating signal identical with LED load quantity；
Current feedback module (4), for acquiring boost module (1) output to the electric current of LED load and being output to master controller (2)
It is fed back；
Voltage feedback module (5), for acquiring boost module (1) output to the voltage of LED load and being output to master controller (2)
It is fed back；
Light detection module (6), for acquiring extraneous bright and the information of acquisition being transferred to master controller (2)；
The master controller (2) respectively with boost module (1), multi-channel PWM module (3), current feedback module (4), Voltage Feedback
Module (5) connection, the master controller (2) includes boost terminal (21), current feedback terminal (22), overvoltage protection end (23) and LED
Pwm signal input terminal (24) and light adjustable side (25) of identical quantity are loaded, the boost module (1) and boost terminal (21) are even
It connects, the multi-channel PWM module (3) connect with pwm signal input terminal (24), the current feedback module (4) and current feedback terminal
(22) it connects, the voltage feedback module (5) connect with overvoltage protection end (23), the light detection module (6) and light adjustable side
(25) it connects.
2. a kind of constant current driving system for television backlight LED according to claim 1, it is characterised in that: further include
The LED current balance module (7) for balancing LED load operating current is connect with the cathode of LED load, the LED current is flat
Weighing apparatus module (7) is connect with master controller (2).
3. a kind of constant current driving system for television backlight LED according to claim 2, it is characterised in that: the master
Controller (2) further includes current detecting identical with LED load quantity end (26), the LED current balance module (7) and electric current
Test side (26) connection.
4. a kind of constant current driving system for television backlight LED according to claim 2, it is characterised in that: the master
Controller (2) further includes current compensation identical with LED load quantity end (27), the LED current balance module (7) and electric current
Compensating end (27) connection.
5. a kind of constant current driving system for television backlight LED according to claim 1, it is characterised in that: described more
Road PWM module (3) includes the PWM wave for generating the PWM generator of pwm signal (31) and generating PWM generator (31)
It is divided into the channel module (32) of the PWM wave of quantity identical as load, the PWM generator (31) includes pwm signal output end
(311), the pwm signal output end (311) connect with channel module (32).
6. a kind of constant current driving system for television backlight LED according to claim 1, it is characterised in that: further include
Power output end (9) of the power input (8) and output services voltage being connect with external power supply to LED load, the electricity
Source input terminal (8) is connect with boost module (1), multi-channel PWM module (3), master controller (2) respectively, the power output end (9)
It is connect respectively with current feedback module (4), voltage feedback module (5).
7. a kind of constant current driving system for television backlight LED according to claim 6, it is characterised in that: the liter
Die block (1) includes boosting rectifier control end (11) and input terminal (12), and the input terminal (12) and power supply of the boost module (1) are defeated
Enter end (8) connection, the boosting rectifier control end (11) connect with the boost terminal (21) of master controller (2).
8. a kind of constant current driving system for television backlight LED according to claim 1, it is characterised in that: the liter
Die block (1) includes BOOST booster circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821213692.8U CN208507169U (en) | 2018-07-27 | 2018-07-27 | A kind of constant current driving system for television backlight LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821213692.8U CN208507169U (en) | 2018-07-27 | 2018-07-27 | A kind of constant current driving system for television backlight LED |
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| Publication Number | Publication Date |
|---|---|
| CN208507169U true CN208507169U (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821213692.8U Expired - Fee Related CN208507169U (en) | 2018-07-27 | 2018-07-27 | A kind of constant current driving system for television backlight LED |
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| CN (1) | CN208507169U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110060641A (en) * | 2019-04-23 | 2019-07-26 | 深圳市华星光电技术有限公司 | Display system circuit and display device |
-
2018
- 2018-07-27 CN CN201821213692.8U patent/CN208507169U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110060641A (en) * | 2019-04-23 | 2019-07-26 | 深圳市华星光电技术有限公司 | Display system circuit and display device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190215 Termination date: 20200727 |
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| CF01 | Termination of patent right due to non-payment of annual fee |