CN106341631A - Backlight driving device and television set - Google Patents
Backlight driving device and television set Download PDFInfo
- Publication number
- CN106341631A CN106341631A CN201610797561.8A CN201610797561A CN106341631A CN 106341631 A CN106341631 A CN 106341631A CN 201610797561 A CN201610797561 A CN 201610797561A CN 106341631 A CN106341631 A CN 106341631A
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- voltage
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- resistance
- led lamp
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a backlight driving device and a television set. The backlight driving device comprises an AC-DC converter, a control module and a driving branch, wherein the AC-DC converter is used for converting an AC current into a DC current and providing the DC current to an LED lamp string, the control module is used for outputting a first PWM signal used for adjusting an output current reference of a voltage reduction converter and a second PWM signal used for adjusting an output voltage of the voltage reduction converter, the driving branch comprises two interface modules and a voltage reduction converter, one interface module is used for converting the first PWM signal into a corresponding first voltage signal, the other interface module is used for converting the second PWM signal into a corresponding second voltage signal, and the voltage reduction converter is used for carrying out current and voltage control on the DC current outputted by the AC-DC converter according to the first voltage signal and the second voltage signal. The backlight driving device is advantaged in that high reliability is realized.
Description
Technical field
The present invention relates to technical field of television sets, particularly to a kind of backlight drive device and television set.
Background technology
Existing backlight drive device, is typically designed under conditions of clear and definite LED lamp bar specifications parameter.
Such as, need to drive four road LED lamp bars, the driving voltage/driving current needed for the LED lamp bar of each road is 200v/0.15a, then
The backlight drive device designing accordingly has four roads and drives output, and it is 200v/ that each road drives the voltage/current parameter of output
0.15a.
If changing the LED lamp bar that driving voltage/driving current is 100v/0.3a, the backlight drive device designing before this
No longer applicable, need the specifications parameter according to LED lamp bar to redesign backlight drive device.Therefore, existing backlight drive dress
Put the defect that there is poor compatibility.
Content of the invention
The main object of the present invention is to provide a kind of backlight drive device it is intended to improve the compatibility of this backlight drive device
Property.
For achieving the above object, backlight drive device proposed by the present invention include AC/DC converter, control module and
Drive branch road；Wherein, described AC/DC converter, is used for converting alternating current to unidirectional current and being supplied to LED lamp bar；Institute
State control module, adjust a pwm signal of buck converter output current benchmark for output, and output adjusts described fall
2nd pwm signal of buckling parallel operation output voltage；Described driving branch road includes: two interface modules and buck converter, wherein
One interface module is used for for a described pwm signal being converted into corresponding first voltage signal, and another interface module is used for
Described 2nd pwm signal is converted into corresponding second voltage signal, described buck converter, for according to described first voltage
Signal and described second voltage signal carry out electric current and voltage control to the unidirectional current that described AC-dc converter exports, with
Drive described LED lamp bar work.
Preferably, the described buck converter driving branch road is multiple, and each described buck converter is respectively used to according to institute
State first voltage signal and described second voltage signal carries out electric current and electricity to the unidirectional current that described AC-dc converter exports
Voltage-controlled system, to drive each self-corresponding described LED lamp bar work.
Preferably, described control module, is additionally operable to export the 3rd pwm signal adjusting described LED lamp article brightness；Described drive
Dynamic branch road also include for described 3rd pwm signal is converted into corresponding tertiary voltage signal another interface module, with
And described tertiary voltage signal is converted into the converter of corresponding current signal；Described voltage/current conversion
Device, for being converted into corresponding current signal by described tertiary voltage signal；Described buck converter, for according to described first
Voltage signal, described second voltage signal and described current signal are carried out to the unidirectional current that described AC-dc converter exports
Electric current and voltage control, to drive described LED lamp bar work.
Preferably, the described buck converter driving branch road is multiple, and each described buck converter is used for according to described the
The unidirectional current that one voltage signal, described second voltage signal and described current signal export to described AC-dc converter enters
Row electric current and voltage control, to drive described LED lamp bar work.
Preferably, each described interface module includes protection location, voltage follow unit and voltage output unit；Described guarantor
The input of shield unit is connected with described control module, the input of the outfan of described protection location and described voltage follow unit
End connects, and the outfan of described voltage follow unit is connected with the input of described voltage output unit, described voltage output list
The outfan of unit is used for output voltage signal.
Preferably, described protection location includes the first electric capacity；The first end of described first electric capacity is described protection location
Input, the second end of described first electric capacity is the outfan of described protection location.
Preferably, described voltage follow unit include the first diode, the first audion, the second audion, first resistor,
Second resistance, 3rd resistor and the 4th resistance；The negative electrode of described first diode is connected with the base stage of described first audion, its
Connecting node is the input of described voltage follow unit；The colelctor electrode of described first audion, the second of described first resistor
First end interconnection, the first end of the first end of described first resistor and described second resistance and the reference of end and described 3rd resistor
Power supply connects, the base stage interconnection at the second end of described 3rd resistor, the first end of described 4th resistance and described second audion,
The colelctor electrode of described second audion is connected with the second end of described second resistance, and its connecting node is described voltage follow unit
Outfan；The anode of described first diode, the emitter stage of described first audion, the second end of described 4th resistance and institute
State the grounded emitter of the second audion.
Preferably, described voltage output unit includes the second electric capacity, the 3rd electric capacity, the 5th resistance and the 6th resistance；Described
The first end of the 5th resistance is the input of described voltage output unit；Second end of described 5th resistance, described second electric capacity
First end and described 6th resistance first end interconnection, the second end of described 6th resistance and the first end of described 3rd electric capacity
Connect, its connecting node is the outfan of described voltage output unit；Second end of described second electric capacity and described 3rd electric capacity
Second end ground connection.
The present invention also proposes a kind of television set, and this television set includes backlight drive device as above；Wherein, the described back of the body
Drive unit includes AC/DC converter, control module and drives branch road；Wherein, described AC/DC converter, uses
In converting alternating current to unidirectional current and be supplied to LED lamp bar；Described control module, adjusts described buck converter for output
First pwm signal of output current benchmark, and the 2nd pwm signal of the output described buck converter output voltage of regulation；Institute
State driving branch road to include: two interface modules and buck converter, one of interface module is used for a described pwm signal
It is converted into corresponding first voltage signal；Another interface module is used for for described 2nd pwm signal being converted into corresponding second
Voltage signal；Described buck converter, for according to described first voltage signal and described second voltage signal to described exchange/
The unidirectional current of DC converter output carries out electric current and voltage controls, to drive described LED lamp bar work.
Technical solution of the present invention changes buck converter in driving branch road by changing the control program in control module
The reference current of output and maximum drive voltage are so that backlight drive device proposed by the present invention can be according to LED lamp to be driven
Its output parameter of specifications parameter Automatic adjusument of bar, reaches the purpose driving LED lamp bar normal work, strengthens compatibility.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of backlight drive device first embodiment of the present invention；
Fig. 2 is the high-level schematic functional block diagram of backlight drive device second embodiment of the present invention；
Fig. 3 is the high-level schematic functional block diagram of backlight drive device 3rd embodiment of the present invention；
Fig. 4 is the high-level schematic functional block diagram of backlight drive device fourth embodiment of the present invention；
Fig. 5 is the electrical block diagram of interface module shown in Fig. 1 to Fig. 4.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 10 | AC/DC converter | c1 | First electric capacity |
| 20 | Control module | c2 | Second electric capacity |
| 30 | Drive branch road | c3 | 3rd electric capacity |
| 40 | Interface module | r1 | First resistor |
| 50 | Buck converter | r2 | Second resistance |
| 60 | Converter | r3 | 3rd resistor |
| 100 | Protection location | r4 | 4th resistance |
| 200 | Voltage follow unit | r5 | 5th resistance |
| 300 | Voltage output unit | r6 | 6th resistance |
| q1 | First audion | rt | Transfer resistance |
| q2 | Second audion | d1 | First diode |
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work all its
His embodiment, broadly falls into the scope of protection of the invention.
If it is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the embodiment of the present invention,
It is only used for explaining the relative position relation between each part, motion conditions etc. under a certain particular pose (as shown in drawings), such as
Really this particular pose changes, then directionality instruction also correspondingly changes therewith.
In addition, the description being related to " first ", " second " etc. in the present invention is only used for describing purpose, and it is not intended that referring to
Show or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", "
Two " feature can be expressed or implicitly include at least one this feature.In addition, the technical scheme between each embodiment can
To be combined with each other, but must be capable of by those of ordinary skill in the art based on, when the combination of technical scheme occurs
Conflicting or will be understood that the combination of this technical scheme does not exist, also not in the protection model of application claims when cannot realize
Within enclosing.
The present invention propose a kind of backlight drive device, this backlight drive device be applied to the electronic equipment with LED lamp,
It is particularly suited in television set.
As shown in figure 1, in one embodiment, backlight drive device proposed by the present invention include AC/DC converter 10,
Control module 20 and driving branch road 30；Wherein, AC/DC converter 10 is used for converting alternating current to unidirectional current and being supplied to
LED lamp bar；Control module 20 is used for the pwm signal that output adjusts buck converter 50 output current benchmark, and output
Adjust the 2nd pwm signal of buck converter 50 output voltage；Branch road 30 is driven to include two interface modules 40 and decompression transformation
Device 50, one of interface module 40 is used for for a pwm signal being converted into corresponding first voltage signal, another interface mould
Block 40 is used for for the 2nd pwm signal being converted into corresponding second voltage signal, and buck converter 50 is used for being believed according to first voltage
Number and second voltage signal unidirectional current that AC-dc converter 10 export carry out electric current and voltage control, to drive LED lamp
Bar works.
It should be noted that in the present embodiment, control module 20 includes control chip (not shown) and its peripheral circuit
(not shown), control chip includes memory element (not shown) and control unit (not shown).Memory element is used for depositing
The control program of storage computer input；Control unit is used for exporting corresponding first according to the control program that memory element is stored
Pwm signal and the 2nd pwm signal, when needing to change the dutycycle of a pwm signal and/or the 2nd pwm signal, can pass through
The control program changing storage in memory element is realized.Those skilled in the art are it is contemplated that the tool of above-mentioned control chip
Build number can have multiple, and the circuit structure of peripheral circuit corresponding with control chip also has multiple, does not all do concrete limit herein
System.
Backlight drive device is accessed civil power, civil power is converted into after galvanic current carrying by AC/DC converter 10
Supply LED lamp bar, and realize alternating current and galvanic isolation.Meanwhile, control module 20 exports a pwm signal and the
Two pwm signals, to driving branch road 30, drive one of branch road 30 interface module 40 that a pwm signal is converted into corresponding the
One voltage signal, the 2nd pwm signal is converted into corresponding second voltage signal by another interface module 40；Buck converter 50
According to the reference current of its output of first voltage Signal Regulation, according to its maximum output voltage of second voltage Signal Regulation.
It is assumed that maximum drive voltage/the reference current exporting when backlight drive device dispatches from the factory is 100v/ in the present embodiment
0.15a.
When the specifications parameter of LED lamp bar to be driven is 100v/0.15a, directly by backlight drive device and led to be driven
Lamp bar fits together, and LED lamp bar to be driven can be with normal work.
When the specifications parameter of LED lamp bar to be driven is 100v/0.3a, by backlight drive device and LED lamp to be driven
After bar fits together, increase the dutycycle of a pwm signal, make the reference current that buck converter 50 exports be 0.3a, treat
Driving LED lamp bar can be with normal work.Increasing a pwm signal dutyfactor, making the reference current that buck converter 50 exports
After 0.3a, backlight drive device is fitted together with LED lamp bar to be driven, LED lamp bar to be driven can also normal work.
When the specifications parameter of LED lamp bar to be driven is 100v/0.1a, by backlight drive device and LED lamp to be driven
After bar fits together, reduce a pwm signal dutyfactor, make the reference current that buck converter 50 exports be 0.1a, wait to drive
Dynamic LED lamp bar can be with normal work.In the dutycycle reducing a pwm signal, make the reference current that buck converter 50 exports
After 0.1a, backlight drive device is fitted together with LED lamp bar to be driven, LED lamp bar to be driven can also normal work.
When the specifications parameter of LED lamp bar to be driven is 200v/0.1a, by backlight drive device and LED lamp to be driven
After bar fits together, reduce the dutycycle of a pwm signal, increase the dutycycle of the 2nd pwm signal, make buck converter 50
The maximum drive voltage of output is more than or equal to 200v, and reference current is 0.1a, and LED lamp bar to be driven can be with normal work.
In the dutycycle reducing a pwm signal, increase the dutycycle of the 2nd pwm signal, make the maximum drive that buck converter 50 exports
Galvanic electricity pressure is more than or equal to 200v, after reference current is 0.1a, backlight drive device and LED lamp bar to be driven is assembled in one
Rise, LED lamp bar can also normal work.
When the specifications parameter of LED lamp bar to be driven is 200v/0.15a, by backlight drive device and LED lamp to be driven
After bar fits together, increase the 2nd pwm signal dutycycle, make buck converter 50 export maximum drive voltage be more than or
Person is equal to 200v, and LED lamp bar to be driven can be with normal work.In the dutycycle increasing the 2nd pwm signal, make buck converter 50
After the maximum drive voltage of output is more than or equal to 200v, backlight drive device is fitted together with LED lamp bar to be driven,
LED lamp bar to be driven can also normal work.
When the specifications parameter of LED lamp bar to be driven is 50v/0.15a, directly by backlight drive device and led to be driven
Lamp bar fits together, and LED lamp bar can be with normal work.Backlight drive device is being fitted together with LED lamp bar to be driven
Afterwards, reduce the dutycycle of the 2nd pwm signal, make the maximum drive voltage that buck converter 50 exports between 50v to 100v,
LED lamp bar can also normal work.In the dutycycle reducing the 2nd pwm signal, make the maximum drive that buck converter 50 exports
After voltage is between 50v to 100v, backlight drive device is fitted together with LED lamp bar to be driven, LED lamp bar to be driven
Can be with normal work.
It is noted that assemble backlight drive device with LED lamp bar to be driven when it is desirable to backlight drive device with treat
Drive LED lamp bar to be detachably connected, and current loop can be formed between the two.Its concrete connected mode is not limited herein.
It can be readily appreciated that backlight drive device proposed by the present invention can be according to the specifications parameter of LED lamp bar to be driven
, so that LED lamp bar normal work to be driven, compatibility is by force for its output parameter of Automatic adjusument.
As shown in Fig. 2 in a preferred embodiment, the buck converter 50 of above-mentioned driving branch road 30 is multiple, each blood pressure lowering
Changer 50 is respectively used to unidirectional current AC-dc converter 10 being exported according to first voltage signal and second voltage signal
Carry out electric current and voltage controls, to drive each self-corresponding LED lamp bar work.
In the present embodiment, the quantity of each buck converter 50 driving branch road 30 to have can be 2,3,4,
Even more many, it is not limited herein.It should be noted that in backlight drive device proposed by the present invention, output multi-channel is identical simultaneously
Maximum drive circuit/reference current when, the specifications parameter not limiting LED lamp bar corresponding to each buck converter 50 is identical.
Such as, each buck converter 50 quantity driving branch road 30 is 4, the maximum of each buck converter 50 output
Driving voltage/reference current is 200v/0.15a.Then the specifications parameter of LED lamp bar corresponding with each buck converter 50 can be
200v/0.15a, 180v/0.15a, 150v/0.15a and 180v/0.15a；Can also be 110v/0.15a, 120v/0.15a,
140v/0.15a and 150v/0.15a.Certainly, the specifications parameter of LED lamp bar corresponding with each buck converter 50 can also be it
Its combination, does not enumerate herein.
It is understood that changing the quantity of the buck converter 50 driving branch road 30 to have it is possible to change backlight
The output interface number of driving means, thus improve the compatibility of backlight drive device further.
As shown in figure 3, in a preferred embodiment, backlight drive device proposed by the present invention also has dimming function, tool
Body ground, control module 20 is additionally operable to export the 3rd pwm signal adjusting LED lamp article brightness；Branch road 30 is driven also to include for inciting somebody to action
First pwm signal is converted into another interface module 40 of corresponding first voltage signal and changes tertiary voltage signal
Become the converter 60 of corresponding current signal；Buck converter 50 is used for according to first voltage signal, second voltage
The unidirectional current that signal and current signal export to AC-dc converter 60 carries out electric current and voltage controls, to drive LED lamp bar
Work.
It should be noted that in the present embodiment, control module 20 includes control chip (not shown) and its peripheral circuit
(not shown), control chip includes memory element (not shown) and control unit (not shown).Memory element is used for depositing
The control program of storage computer input；Control unit is used for exporting corresponding first according to the control program that memory element is stored
Pwm signal, the 2nd pwm signal, and combine the dim signal corresponding 3rd pwm signal of output of TV SKD input,
Need to change a pwm signal and/or the 2nd pwm signal dutycycle when, can be by changing the control journey of computer input
Sequence is realized, in the dutycycle needing to change the 3rd pwm signal, can be real by changing the dim signal of TV SKD input
Existing.Those skilled in the art it is contemplated that the concrete model of above-mentioned control chip can have multiple, corresponding to control chip
The circuit structure of peripheral circuit also have multiple, be all not particularly limited herein.Wherein, converter 60 can be
Resistive module, considers for simplifying circuit structure, converter 60 is preferably transfer resistance rt.
After backlight drive device is fitted together with LED lamp bar to be driven, backlight drive device is accessed civil power, hand over
Civil power is converted into after stable direct current being supplied to LED lamp bar by stream/direct current transducer 10, and realize alternating current with galvanic every
From.Meanwhile, control module 20 exports a pwm signal, the 2nd pwm signal and the 3rd pwm signal to driving branch road 30, drives
First pwm signal is converted into corresponding first voltage signal by one of dynamic branch road 30 interface module 40, another interface mould
2nd pwm signal is converted into corresponding second voltage signal by block 40, and the 3rd pwm signal is converted into by another interface module 40
Corresponding tertiary voltage signal；Tertiary voltage signal is converted into corresponding current signal by converter 60.Blood pressure lowering becomes
Parallel operation 50 is according to the reference current of its output of first voltage Signal Regulation, electric according to its maximum output of second voltage Signal Regulation
Pressure, adjusts its output current according to current signal.
When the brightness needing to adjust LED lamp bar, control mould can be changed by changing the dim signal of mainboard output
The dutycycle of the 3rd pwm signal of block 20 output, thus changing the output current of backlight drive device, reaches regulation LED lamp bar
Brightness purpose.
As shown in figure 4, in a preferred embodiment, the buck converter 50 driving branch road 30 is multiple, each decompression transformation
Device 50 is used for direct current AC-dc converter 10 being exported according to first voltage signal, second voltage signal and current signal
Electricity carries out electric current and voltage controls, to drive LED lamp bar to work.
In the present embodiment, the quantity of each buck converter 50 driving branch road 30 to have can be 2,3,4,
Even more many, it is not limited herein.It should be noted that in backlight drive device proposed by the present invention, output multi-channel is identical simultaneously
Maximum drive circuit/reference current when, the specifications parameter not limiting LED lamp bar corresponding to each buck converter 50 is identical.
Such as, each buck converter 50 quantity driving branch road 30 is 4, the maximum of each buck converter 50 output
Driving voltage/driving current is 200v/0.15a.Then the specifications parameter of LED lamp bar corresponding with each buck converter 50 can be
120v/0.15a, 120v/0.15a, 150v/0.15a and 120v/0.15a；Can also be 130v/0.15a, 140v/0.15a,
150v/0.15a and 160v/0.15a.Certainly, the specifications parameter of LED lamp bar corresponding with each buck converter 50 can also be it
Its combination, does not enumerate herein.
It is understood that driving the quantity of buck converter 50 that branch road 30 has more, backlight drive device
Output interface is also more, and compatibility is also stronger.
As shown in figure 5, in a preferred embodiment, each interface module 40 includes protection location 100, voltage follow unit
200 and voltage output unit 300；The input of protection location 100 is connected with control module 20, the outfan of protection location 100
It is connected with the input of voltage follow unit 200, the input of the outfan of voltage follow unit 200 and voltage output unit 300
End connects, and the outfan of voltage output unit 300 is used for output voltage signal.
It should be noted that when the control program normal operation in control module 20, interface module 40 receives normally
Pwm signal, protection location 10 and voltage follow unit 20 output with input pwm signal waveform identical pwm signal, voltage
The pwm signal of input is integrated Filtering Processing by output unit 30, with the dutycycle pair of output size and the pwm signal of input
The voltage signal answered.When the control program operation exception in control module 20, interface module 40 receives lasting low level
Signal or lasting high level signal, protection location 100, voltage follow unit 200 and voltage output unit 300 output voltage
It is all zero, circuit is protected.
As shown in figure 5, in a preferred embodiment, protection location 100 includes the first electric capacity c1；The first of first electric capacity c1
Hold the input for protection location 100, second end of the first electric capacity c1 is the outfan of protection location 100.
It is well known that capacity cell has the function of logical exchange stopping direct current.When input to the first of the first electric capacity c1
When the signal of telecommunication at end is normal pwm signal, second end of the first electric capacity c1 exports and this pwm signal waveform identical telecommunications
Number；When the signal of telecommunication of the first end of input to the first electric capacity c1 is lasting high level signal or lasting low level signal
When, second end of the first electric capacity c1 does not export.So, protection location 100 is achieved that the defencive function to circuit.
As shown in figure 5, in a preferred embodiment, voltage follow unit 200 includes the first diode d1, the first audion
Q1, the second audion q2, first resistor r1, second resistance r2,3rd resistor r3 and the 4th resistance r41；First diode d1's
Negative electrode is connected with the base stage of the first audion q1, and its connecting node is the input of voltage follow unit 200；First audion q1
Colelctor electrode, the second end of first resistor r1 and 3rd resistor r3 first end interconnection, the first end of first resistor r1 and second
The first end of resistance r2 is connected with reference power source vref, the second end of 3rd resistor r3, the first end and second of the 4th resistance r4
The base stage interconnection of audion q2, the colelctor electrode of the second audion q2 is connected with the second end of second resistance r2, and its connecting node is
The outfan of voltage follow unit 200；The anode of the first diode d1, the emitter stage of the first audion q1, the 4th resistance r4
Second end and the grounded emitter gnd of the second audion q2.
It should be noted that in the present embodiment, the first audion q1 and the second audion q2 are npn audion.
When voltage follow unit 200 input high level signal, the first audion q1 conducting, the current collection of the first audion q1
Pole tension is pulled low.The base voltage of the second audion q2 is pulled low, the second audion q2 cut-off, the current collection of the second audion q2
Pole tension is driven high, and voltage follow unit 200 exports high level signal.When voltage follow unit 200 input low level signal,
First audion q1 cut-off, the collector voltage of the first audion q1 is driven high.The base voltage of the second audion q2 is driven high,
Second audion q2 conducting, the collector voltage of the second audion q2 is pulled low, voltage follow unit 200 output low level letter
Number.
As shown in figure 5, in a preferred embodiment, voltage output unit 300 include the second electric capacity c2, the 3rd electric capacity c3,
5th resistance r5 and the 6th resistance r6；The first end of the 5th resistance r5 is the input of voltage output unit 300；5th resistance r5
The second end, the first end of the second electric capacity c2 and the 6th resistance r6 first end interconnection, second end and the 3rd of the 6th resistance r6
The first end of electric capacity c3 connects, and its connecting node is the outfan of voltage output unit 300；Second end of the second electric capacity c2 and
The second end ground connection gnd of three electric capacity c3.
It should be noted that in the present embodiment, the second electric capacity c2 and the 5th resistance r5 constitutes charge-discharge circuit, the 3rd electric capacity
C3 and the 6th resistance r6 constitutes filter circuit.
When the signal of telecommunication of input to voltage output unit 300 is high level, the second electric capacity c2 is filled by the 5th resistance r5
Electricity；When the signal of telecommunication of input to voltage output unit 300 is low level, the second electric capacity c2 passes through the 5th resistance r5 electric discharge.Can
To be understood by, the dutycycle inputting pwm signal to voltage output unit 300 is bigger, and the charging interval of the second electric capacity c2 gets over
Long, the voltage of voltage output unit 300 output is bigger；Conversely, the voltage of voltage output unit 300 output is less.
Hereinafter, the operation principle of backlight drive device of the present invention, in conjunction with Fig. 1 to Fig. 5, is described:
First, backlight drive device is fitted together with LED lamp bar to be driven.
Then, backlight drive device is accessed civil power, line voltage is converted into stable straight by AC/DC converter 10
It is supplied to LED lamp bar after stream electricity, and realize alternating current and galvanic isolation.
Then, the specifications parameter according to LED lamp bar to be driven, by computer to control module 20 input control program,
So that control module 20 exports a pwm signal, the 2nd pwm signal and the 3rd pwm signal of suitable duty ratio.If control module
Control program normal operation in 20, drives interface module 40 output size in branch road 30 corresponding with each pwm signal dutyfactor
First voltage signal, second voltage signal and tertiary voltage signal；Converter 60 output size and tertiary voltage
The corresponding current signal of signal amplitude；At least one buck converter 50 is according to the benchmark electricity of its output of first voltage Signal Regulation
Stream, according to the maximum drive voltage of its output of second voltage Signal Regulation, adjusts its output current according to current signal.If controlling
Control program operation exception in module 20, each buck converter 50 does not export.
Hereafter, if desired adjust the brightness of LED lamp bar, can be changed by changing the dim signal of TV SKD output
The output current of buck converter 50 is realizing.After changing LED lamp bar, if the specifications parameter of current LED lamp bar and backlight are driven
The current output parameter of dynamic device mismatches, then can change in control module 20 control program by computer, make backlight
The output parameter of driving means is matched with the specifications parameter of current LED lamp bar, very easy.
The present invention also proposes a kind of television set, and this television set includes backlight drive device as above, this backlight drive
Concrete structure reference above-described embodiment of device, because this television set employs whole technical schemes of above-mentioned all embodiments,
Therefore at least there are all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the present invention the scope of the claims, every this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/indirectly use
In the scope of patent protection that other related technical fields are included in the present invention.
Claims (9)
1. a kind of backlight drive device is it is characterised in that including AC/DC converter, control module and driving branch road；Its
In,
Described AC/DC converter, is used for converting alternating current to unidirectional current and being supplied to LED lamp bar；
Described control module, adjusts a pwm signal of buck converter output current benchmark for output, and output is adjusted
2nd pwm signal of described buck converter output voltage；
Described driving branch road includes: two interface modules and buck converter, one of interface module is used for described first
Pwm signal is converted into corresponding first voltage signal, and another interface module is used for being converted into corresponding to by described 2nd pwm signal
Second voltage signal,
Described buck converter, for according to described first voltage signal and described second voltage signal to described ac/dc
The unidirectional current of changer output carries out electric current and voltage controls, to drive described LED lamp bar work.
2. backlight drive device as claimed in claim 1 is it is characterised in that the buck converter of described driving branch road is many
Individual, each described buck converter be respectively used to according to described first voltage signal and described second voltage signal to described exchange/
The unidirectional current of DC converter output carries out electric current and voltage controls, to drive each self-corresponding described LED lamp bar work.
3. backlight drive device as claimed in claim 1 is it is characterised in that described control module is additionally operable to described in output regulation
3rd pwm signal of LED lamp article brightness；
Described branch road is driven also to include connecing for described 3rd pwm signal is converted into another of corresponding tertiary voltage signal
Mouth module and the converter that described tertiary voltage signal is converted into corresponding current signal；
Described buck converter, for according to described first voltage signal, described second voltage signal and described current signal pair
The unidirectional current of described AC-dc converter output carries out electric current and voltage controls, to drive described LED lamp bar work.
4. backlight drive device as claimed in claim 3 is it is characterised in that the buck converter of described driving branch road is many
Individual, each described buck converter is used for according to described first voltage signal, described second voltage signal and described current signal pair
The unidirectional current of described AC-dc converter output carries out electric current and voltage controls, to drive described LED lamp bar work.
5. the backlight drive device as described in claim 1-4 any one is it is characterised in that each described interface module includes
Protection location, voltage follow unit and voltage output unit；
The input of described protection location is connected with described control module, the outfan of described protection location and described voltage follow
The input of unit connects, and the outfan of described voltage follow unit is connected with the input of described voltage output unit, described
The outfan of voltage output unit is used for output voltage signal.
6. backlight drive device as claimed in claim 5 is it is characterised in that described protection location includes the first electric capacity；Described
The first end of the first electric capacity is the input of described protection location, and the second end of described first electric capacity is the defeated of described protection location
Go out end.
7. backlight drive device as claimed in claim 5 is it is characterised in that described voltage follow unit includes the one or two pole
Pipe, the first audion, the second audion, first resistor, second resistance, 3rd resistor and the 4th resistance；Described first diode
Negative electrode be connected with the base stage of described first audion, its connecting node is the input of described voltage follow unit；Described
The first end interconnection of the colelctor electrode of one audion, the second end of described first resistor and described 3rd resistor, described first resistor
First end and the first end of described second resistance be connected with reference power source, the second end of described 3rd resistor, described 4th electricity
The base stage interconnection of the first end of resistance and described second audion, the of the colelctor electrode of described second audion and described second resistance
Two ends connect, and its connecting node is the outfan of described voltage follow unit；The anode of described first diode, the described 1st
The grounded emitter of the emitter stage of pole pipe, the second end of described 4th resistance and described second audion.
8. backlight drive device as claimed in claim 5 it is characterised in that described voltage output unit include the second electric capacity,
3rd electric capacity, the 5th resistance and the 6th resistance；The first end of described 5th resistance is the input of described voltage output unit；Institute
State the first end interconnection at second end, the first end of described second electric capacity and described 6th resistance of the 5th resistance, described 6th electricity
Second end of resistance is connected with the first end of described 3rd electric capacity, and its connecting node is the outfan of described voltage output unit；Institute
State the second end of the second electric capacity and the second end ground connection of described 3rd electric capacity.
9. a kind of television set is it is characterised in that described television set includes the backlight drive as described in claim 1-8 any one
Device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610797561.8A CN106341631A (en) | 2016-08-31 | 2016-08-31 | Backlight driving device and television set |
| PCT/CN2016/112467 WO2018040420A1 (en) | 2016-08-31 | 2016-12-27 | Backlight driver and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610797561.8A CN106341631A (en) | 2016-08-31 | 2016-08-31 | Backlight driving device and television set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106341631A true CN106341631A (en) | 2017-01-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610797561.8A Pending CN106341631A (en) | 2016-08-31 | 2016-08-31 | Backlight driving device and television set |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106341631A (en) |
| WO (1) | WO2018040420A1 (en) |
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Also Published As
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| WO2018040420A1 (en) | 2018-03-08 |
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