CN104935843B - A kind of LED television two-in-one electric source circuit and LED television - Google Patents
A kind of LED television two-in-one electric source circuit and LED television Download PDFInfo
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Abstract
The invention discloses a kind of LED television two-in-one electric source circuit and LED television, wherein, the LED television two-in-one electric source circuit includes rectification filtering module, PFC module, circuit of reversed excitation module, LLC half-bridge resonances module, constant flow module, feedback module and LLC control modules.After the rectified filtering of alternating current and PFC module correction, it is divided into two-way, is powered all the way through circuit of reversed excitation module to mainboard movement, another way is powered by LLC half-bridge resonances module to LED light bar.Because LED light bar is different with voltage needed for mainboard movement, is separately powered using two-way, improve power supplying efficiency, reduce former device cost.LLC control modules are fed back to the primary of the LLC transformers of LLC half-bridge resonance modules, monitor resonance slot status in real time, protection is complete.Moreover, the present invention is few without driving transformer, the number of safety device.
Description
Technical field
The present invention relates to Switching Power Supply and LED drive circuit field, more particularly to a kind of LED television two-in-one electric source circuit
And LED television.
Background technology
Existing typical high power TV power supply, its main board power supply and backlight drive, it is by a LLC circuit output two-way
Stable voltage：12V is to mainboard and liquid-crystalline glasses, the input electricity of 24V or other voltages as LED constant current backlight drive part
Pressure, LED constant current are driven as the electric current needed for Boost circuit voltage increase and current constant to LED light bar.
Specific method as shown in figure 1, alternating current input after through over commutation filtering and PFC circuits, it is defeated by LLC half-bridge resonances
Go out two-way voltage, 12V directly supplies power to mainboard core section all the way, and another medium voltage is boosted by Boost and constant current
After supply electricity to LED light bar use.The conventional method, because backlight drive part is by one-level Boost boostings, loss is serious, overall
Efficiency is low, and because device is more, cost is high.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of two-in-one power supply of LED television
Circuit and LED television, efficiently solve the device that LED television power circuit efficiency is low, cost is high, can not protect primary side
Problem.
In order to achieve the above object, this invention takes following technical scheme：
A kind of LED television two-in-one electric source circuit, including rectification filtering module, PFC module, circuit of reversed excitation module, LLC half
Bridge resonance modules, constant flow module, feedback module and LLC control modules；
The LLC half-bridge resonances module includes：
LLC metal-oxide-semiconductor units, for the output signal according to LLC control modules, the break-make of control LLC transformers；
LLC transformers, for being depressured and being powered for LED light bar；
First rectification filtering unit, the voltage for being inputted to LLC transformers carries out rectifying and wave-filtering, and exports to described
LED light bar；
The LLC control modules connect the LLC transformers by the LLC metal-oxide-semiconductors unit, and the LLC transformers lead to
Cross first rectification filtering unit and connect the LED light bar；
The circuit of reversed excitation module includes：
Pipe unit is switched, for controlling the break-make of flyback transformer；
Flyback transformer, the voltage conversion for PFC module to be exported are the voltage needed for the mainboard movement；
Second rectification filtering unit, the voltage for being inputted to flyback transformer carries out rectifying and wave-filtering, and exports to described
Mainboard movement；
Feedback unit, for gathering the voltage of the mainboard movement, and export and give flyback controller；
Flyback controller, for the voltage fed back according to feedback unit, realized by the break-make of controlling switch pipe unit anti-
The voltage stabilizing output of excitation circuit module；
The PFC module connects one end of the flyback transformer armature winding, the flyback transformer armature winding
The output end of the other end connection switch pipe unit, the secondary windings of the flyback transformer connect the feedback unit, gone back
The mainboard movement is connected by second rectification filtering unit；The feedback unit connects institute by the flyback controller
State the input of switch pipe unit；
Alternating current is carried out rectification and filtering by the rectification filtering module, is exported to PFC module；The PFC module is to whole
Flow filtered direct current and carry out PFC, and export to LLC half-bridge resonances module and circuit of reversed excitation module；It is described
LLC half-bridge resonances module is powered to LED light bar；The voltage and current of constant flow module sampling LED light bar, according to the voltage and
The parameter of current regulation feedback module, feedback module is set to export high/low level signal to the LLC according to the regulation of constant flow module
Control module, the low and high level signal that the LLC control modules export according to feedback module, is controlled by LLC metal-oxide-semiconductors unit
The break-make of the LLC primaries winding is made, LLC control modules is fed back to the LLC transformers of LLC half-bridge resonance modules
Primary, make the electric current of LED light bar constant；The circuit of reversed excitation module exports stable voltage and powered to mainboard movement.
In described LED television two-in-one electric source circuit, the LLC metal-oxide-semiconductors unit includes the first metal-oxide-semiconductor and the 2nd MOS
Pipe；One end of the output end of the drain electrode connection PFC module of first metal-oxide-semiconductor and the armature winding of the LLC transformers, it is described
The drain electrode of the other end and the second metal-oxide-semiconductor of the armature winding of the source electrode connection LLC transformers of first metal-oxide-semiconductor, described first
The grid level of metal-oxide-semiconductor connects the LLC control modules；The grid of second metal-oxide-semiconductor connects the LLC control modules, and described the
The source ground of two metal-oxide-semiconductors.
In described LED television two-in-one electric source circuit, the constant flow module includes constant current constant voltage control chip, the first electricity
Resistance, second resistance and 3rd resistor；One end of the first resistor is the voltage input end of the constant flow module, connection is first whole
The output end of filter unit and the positive pole of LED light bar are flowed, the other end connection constant current constant voltage control chip of the first resistor
VSENSE ends, also it is grounded by second resistance；One end of the 3rd resistor is the current input terminal of the constant flow module, connection
The negative pole of LED light bar and the ISENSE ends of constant current constant voltage control chip, the other end ground connection of the 3rd resistor；The constant current is permanent
The VCC ends of control chip are pressed to connect the output end of the circuit of reversed excitation module, the FB ends connection of the constant current constant voltage control chip
The input of the feedback module, the GND ends of the constant current constant voltage control chip and Ictrl ends ground connection.
In described LED television two-in-one electric source circuit, the feedback module includes the first optocoupler, the 4th resistance and the 5th
Resistance；One end of 4th resistance is the input of the feedback module, the FB ends of the connection constant current constant voltage control chip,
The other end of 4th resistance connects the second end of first optocoupler, and the first end of first optocoupler connects the flyback
The output end of circuit module；The 3rd end ground connection of first optocoupler, the 4th end of first optocoupler connect the 5th resistance
One end, the other end of the 5th resistance are the first input of the output end of the feedback module, the connection LLC control modules
End.
In described LED television two-in-one electric source circuit, the power circuit also includes light-adjusting module, the light-adjusting module
According to pwm signal, the output of the LLC half-bridge resonances module is controlled by the LLC control modules, is realized to LED light bar
Light modulation.
In described LED television two-in-one electric source circuit, the LLC control modules include LLC control chips, the one or two pole
Pipe and the first electric capacity；The VCC ends connection externally fed end of the LLC control chips；The positive pole connection of first diode is outer
The VCC ends of portion's feeder ear and the LLC control chips, the negative pole of first diode connect the LLC control chips
Vboot ends and one end of the first electric capacity, the other end of first electric capacity connect the Mup ends and first of the LLC control chips
The grid of metal-oxide-semiconductor；The HB ends of the LLC control chips connect drain electrode and the LLC transformations of the source electrode, the second metal-oxide-semiconductor of the first metal-oxide-semiconductor
The other end of device armature winding；The Mlow ends of the LLC control chips connect the grid of second metal-oxide-semiconductor；The LLC controls
The RT ends of chip are the first input end of LLC control modules, the other end of the 5th resistance of connection；The BO of the LLC control chips
Hold the second input for LLC control modules, the connection light-adjusting module, the GND ends ground connection of the LLC control chips.
In described LED television two-in-one electric source circuit, the light-adjusting module includes the 6th resistance, the 7th resistance, the 8th
Resistance, the second diode, the second optocoupler and the first triode：One end of 6th resistance connects the circuit of reversed excitation module
Output end, the other end of the 6th resistance connect the first end of the second optocoupler, the second end connection first of second optocoupler
The colelctor electrode of triode, the grounded emitter of first triode；The 3rd end ground connection of second optocoupler, second light
4th end of coupling connects the BO ends of the LLC control chips；The input of the just extremely described light-adjusting module of second diode
End, connection PWM dim signals provide end, and the negative pole of second diode connects the base of the first triode by the 7th resistance
Pole, also pass through the 8th resistance eutral grounding.
A kind of LED television, including LED television two-in-one electric source circuit as described above.
Compared to prior art, LED television two-in-one electric source circuit and LED television provided by the invention, alternating current warp
After rectifying and wave-filtering and PFC module correction, it is divided into two-way, is powered all the way through circuit of reversed excitation module to mainboard movement, another way passes through
LLC half-bridge resonances module is powered to LED light bar.Because LED light bar is different with voltage needed for mainboard movement, separately supplied using two-way
Electricity, power supplying efficiency is improved, reduce former device cost.The LLC that LLC control modules are fed back to LLC half-bridge resonance modules becomes
The primary of depressor, monitors resonance slot status in real time, and protection is complete.Moreover, the present invention is without driving transformer, of safety device
Number is few.
Brief description of the drawings
Fig. 1 is the structured flowchart of existing LED television power circuit.
Fig. 2 is the structured flowchart of LED television two-in-one electric source circuit provided by the invention.
Fig. 3 is the circuit of rectification filtering module and PFC module in LED television two-in-one electric source circuit provided by the invention
Figure.
Fig. 4 is in LED television two-in-one electric source circuit provided by the invention, LLC half-bridge resonances module, constant flow module, anti-
Present the circuit diagram of module and LLC control modules.
Fig. 5 is the circuit diagram of circuit of reversed excitation module in LED television two-in-one electric source circuit provided by the invention.
Embodiment
The present invention provides a kind of LED television two-in-one electric source circuit and LED television.To make the purpose of the present invention, technology
Scheme and effect are clearer, clear and definite, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should manage
Solution, specific embodiment described herein only to explain the present invention, are not intended to limit the present invention.
Referring to Fig. 2, LED television two-in-one electric source circuit provided by the invention, including rectification filtering module 10, PFC moulds
Block 20, circuit of reversed excitation module 80, LLC half-bridge resonances module 30, constant flow module 50, feedback module 60 and LLC control modules 70.
Alternating current is carried out rectification and filtering by the rectification filtering module 10, is exported to PFC module 20；The PFC module
Direct current after 20 pairs of rectifying and wave-filterings carries out PFC, and exports to LLC half-bridge resonances module 30 and circuit of reversed excitation mould
Block 80；The LLC half-bridge resonances module 30 is powered to LED light bar 40；The constant flow module 50 sample LED light bar 40 voltage and
Electric current, the parameter according to voltage and current regulation feedback module 60, make LLC control modules 70 feed back to LLC half-bridge resonance moulds
The primary of the LLC transformers of block 30, make the electric current of LED light bar 40 constant；The stable voltage of the output of circuit of reversed excitation module 80
Powered to mainboard movement 90.
In other words, the rectification filtering module 10, for carrying out rectification and filtering to the alternating current for inputting television set.
The PFC module 20, for carrying out PFC to the electric signal after rectifying and wave-filtering, to improve power circuit
Power supplying efficiency.
The LLC half-bridge resonances module 30, for the output of LLC resonance and the close voltage of the voltage of LED light bar 40.
The constant flow module 50, for sampling the voltage and current of LED light bar 40, adjusted and fed back according to the voltage and current
The parameter of module 60.
The feedback module 60, for the regulation according to constant flow module 50, export high/low level signal and controlled to the LLC
Molding block 70.
The LLC control modules 70, for the low and high level signal exported according to feedback module 60, by controlling LLC half
The break-make of the LLC primary windings of bridge resonance modules 30, makes LLC half-bridge resonances module 30 export constant electric current to LED
Lamp bar 40 is powered.
The circuit of reversed excitation module 80, the 12.2V voltages for exporting stable are powered to mainboard movement 90.
Due to being powered using LLC half-bridge resonances module 30 to LED light bar 40, circuit of reversed excitation module 80 supplies to mainboard movement 90
Electricity, separate the power supply of LED light bar 40 and mainboard movement 90.LLC half-bridge resonances module 30 can be directed to the electricity that LED light bar 40 needs
Pressure（24V or other）Electric current is individually adjusted；Circuit of reversed excitation module 80 also can be according to the demand of mainboard movement 90（12.2V）Enter
Row power supply regulation, improves power supplying efficiency, reduces former device cost.Moreover, the present invention feeds back to LLC control modules 70
The primary of the LLC transformers of LLC half-bridge resonances module 30, monitors resonance slot status in real time, and protection is complete.Moreover, nothing of the present invention
Need driving transformer, the number of safety device is few.
Further, the LLC half-bridge resonances module 30 includes：LLC metal-oxide-semiconductors unit 310, LLC transformers 320 and
One rectification filtering unit 330.
The LLC metal-oxide-semiconductors unit 310, for the output signal according to LLC control modules 70, control LLC transformers 320
Break-make.That is, described LLC control modules 70 are specifically used for the low and high level signal exported according to feedback module 60, pass through LLC
Metal-oxide-semiconductor unit 310 controls the break-make of the armature winding of LLC transformers 320.
The LLC transformers 320, for being depressured and being powered for LED light bar 40, specifically for export PFC module 20
Voltage is reduced to the voltage needed for LED light bar 40.
First rectification filtering unit 330, the voltage for being inputted to LLC transformers 320 carry out rectifying and wave-filtering, and defeated
Go out to the LED light bar 40.
The LLC control modules 70 connect the LLC transformers 320, the LLC by the LLC metal-oxide-semiconductors unit 310
Transformer 320 connects the LED light bar 40 by first rectification filtering unit 330.
Fig. 3 show rectification filtering module 10 and the physical circuit figure of PFC module 20, and it is conventional design, and the present invention is not
It is described in detail.
Referring to Fig. 4, the LLC metal-oxide-semiconductors unit 310 includes the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2；Described first
One end of the output end of metal-oxide-semiconductor Q1 drain electrode connection PFC module 20 and the armature winding of the LLC transformers 320, described first
Metal-oxide-semiconductor Q1 source electrode connects the drain electrode of the other end and the second metal-oxide-semiconductor Q2 of the armature winding of the LLC transformers 320, and described the
One metal-oxide-semiconductor Q1 grid level connects the LLC control modules 70；The grid of the second metal-oxide-semiconductor Q2 connects the LLC control modules
70, the source ground of the second metal-oxide-semiconductor Q2.The first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 is NMOS tube, plays switch and makees
With.The LLC transformers 320 include the output end V_ of armature winding L1, the armature winding L1 one end connection PFC module
PFC, the armature winding L1 other end connect the drain electrode of the first metal-oxide-semiconductor Q1 source electrode and the second metal-oxide-semiconductor Q2, therefore only need to control
First metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 grid are that can be achieved to control the break-make of LLC transformers 320.
The constant flow module 50 includes constant current constant voltage control chip U1, first resistor R1, second resistance R2 and 3rd resistor
R3；One end of the first resistor R1 is the voltage input end of the constant flow module 50, the first rectification filtering unit 330 of connection
The positive pole of output end and LED light bar 40, the other end connection constant current constant voltage control chip U1 of first resistor R1 VSENSE
End, also it is grounded by second resistance R2；One end of the 3rd resistor R3 is the current input terminal of the constant flow module 50, connection
The negative pole of LED light bar 40 and constant current constant voltage control chip U1 ISENSE ends, the other end ground connection of the 3rd resistor R3；It is described
Constant current constant voltage control chip U1 VCC ends connect the output end of the circuit of reversed excitation module 80, the constant current constant voltage control chip
U1 FB ends connect the input of the feedback module 60, the GND ends of the constant current constant voltage control chip U1 and Ictrl terminations
Ground.Wherein, the model N758 of the constant current constant voltage control chip U1.
The feedback module 60 includes the first optocoupler U2, the 4th resistance R4 and the 5th resistance R5；The 4th resistance R4's
One end is the input of the feedback module 60, connection constant current constant voltage control chip U1 FB ends, the 4th resistance R4
The other end connect the second end 2 of the first optocoupler U2, the first end 1 of the first optocoupler U2 connects the circuit of reversed excitation mould
The output end of block 80；The 3rd end 3 of the first optocoupler U2 is grounded, and the 4th end 4 of the first optocoupler U2 connects the 5th resistance
R5 one end, the other end of the 5th resistance R5 is the output end of the feedback module 60, the connection LLC control modules 70
First input end.
The power circuit also includes light-adjusting module 100, and the light-adjusting module 100 passes through the LLC according to pwm signal
Control module 70 controls the output of the LLC half-bridge resonances module 30, realizes the light modulation to LED light bar 40.
The LLC control modules 70 include LLC control chips U3, the first diode D1 and the first electric capacity C1；The LLC controls
Coremaking piece U3 VCC ends connection externally fed end VCC；The positive pole connection externally fed end VCC of the first diode D1 and institute
State LLC control chips U3 VCC ends, the negative pole of the first diode D1 connect the LLC control chips U3 Vboot ends and
First electric capacity C1 one end, the other end of the first electric capacity C1 connect Mup ends and the first MOS of the LLC control chips U3
Pipe Q1 grid；The HB ends of the LLC control chips U3 connect the first metal-oxide-semiconductor Q1 source electrode, the second metal-oxide-semiconductor Q2 drain electrode and
The other end of LLC primary windings；The Mlow ends of the LLC control chips U3 connect the grid of the second metal-oxide-semiconductor Q2；
The RT ends of the LLC control chips U3 are the first input end of LLC control modules 70, the 5th resistance R5 of the connection other end；Institute
The BO ends for stating LLC control chips U3 are the second input of LLC control modules 70, the connection light-adjusting module 100, the LLC
Control chip U3 GND ends ground connection.
The voltage for the LED light bar 40 that the constant current constant voltage control chip U1 samples according to VSENSE ends and the sampling of ISENSE ends
LED light bar 40 electric current, the corresponding level height for changing feedback end FB ends, so as to pass through the first optocoupler U2 break-make, control
The ground state at LLC control chips U3 processed RT ends, and then change the defeated of LLC control chips U3 Mup ends, Mlow ends and HB ends
Go out, so as to realize the break-make control to the armature winding L1 of LLC transformers 320.
The light-adjusting module 100 includes the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the second diode D2, second
Optocoupler U4 and the first triode Q3：One end of the 6th resistance R6 connects the output end of the circuit of reversed excitation module 80, described
The 6th resistance R6 other end connects the second optocoupler U4 first end 1 ', the second end 2 ' connection the one or three of the second optocoupler U4
Pole pipe Q3 colelctor electrode, the grounded emitter of the first triode Q3；The 3rd end 3 ' ground connection of the second optocoupler U4 is described
Second optocoupler U4 the 4th end 4 ' connects the BO ends of the LLC control chips U3；The second diode D2's is just extremely described
The input of light-adjusting module 100, connection PWM dim signals provide end BL_PWM, and the negative pole of the second diode D2 passes through the
Seven resistance R7 the first triodes of connection Q3 base stage, also it is grounded by the 8th resistance R8.The first triode Q3 is NPN type three
Pole pipe.The end BL_PWM pwm signals provided are provided by PWM dim signals, can control the second optocoupler U4 break-make, and then control
The ground state at LLC control chips U3 BO ends, realize the output control at the Mup ends to LLC control chips U3, Mlow ends and HB ends
System, realize light modulation.LED television two-in-one electric source circuit provided by the invention, it need to only increase optocoupler control front end LLC work
Make state, it is simple in construction, it is easy to control, save component cost.
The LLC control modules 70 also include the second electric capacity C2, the 9th resistance R9, the tenth resistance R10, the 11st resistance
R11 and the 12nd resistance R12；The output end of one end connection PFC module 20 and the primary of LLC transformers of the 9th resistance R9
One end of winding, the other end of the 9th resistance R9 connect the tenth resistance R10 one end, the second optocoupler U4 the 4th end 4 ' and
LLC control chips U3 BO ends；The other end ground connection of the tenth resistance R10；The RT ends of the LLC control chips U3 pass through
11 resistance R11 ground connection, also by one end of the 12nd resistance R12 the second electric capacity of connection C2, the second electric capacity C2's
The other end is grounded.
Please continue to refer to Fig. 4, LED television two-in-one electric source circuit provided by the invention, including two LED light bars 40 and two
Individual rectification filtering unit 330, the corresponding LED light bar 40 of a rectification filtering unit 330.Therefore the LLC transformers include two
Individual secondary windings, the corresponding rectification filtering unit 330 of a secondary windings.The constant flow module 50 is to two LED light bars 40
Sampled（Circuit diagram only shows that it is connected with a LED light bar 40 in figure）.
Please refer to fig. 5, the output end V_12 connections mainboard movement 90 of the circuit of reversed excitation module 80, certainly,
The circuit of reversed excitation module 80 is also powered for the light-adjusting module 100, constant flow module 50 and feedback module 60.
The circuit of reversed excitation module 80 includes：Switch pipe unit 810, flyback transformer 820, the second rectification filtering unit
830th, feedback unit 840, flyback controller 850.
The switch pipe unit 810, for controlling the break-make of flyback transformer 820.
The flyback transformer 820, the voltage conversion for PFC module 20 to be exported are needed for the mainboard movement 90
Voltage, 12.2V direct current electricity output is specially converted to the mainboard movement 90.
Second rectification filtering unit 830, the voltage for being inputted to flyback transformer 820 carry out rectifying and wave-filtering, and
Export to the mainboard movement 90.
The feedback unit 840, for gathering the voltage of the mainboard movement 90, and export to flyback controller 850.
The flyback controller 850, for the voltage fed back according to feedback unit 840, pass through controlling switch pipe unit 810
Break-make realize circuit of reversed excitation module voltage stabilizing output.
The PFC module 20 connects one end of the armature winding of flyback transformer 820, at the beginning of the flyback transformer 820
The output end of the other end connection switch pipe unit 810 of level winding, the secondary windings connection institute of the flyback transformer 820
State feedback unit 840, the mainboard movement 90 is also connected by second rectification filtering unit 830；The feedback unit 840
The input of the switch pipe unit 810 is connected by the flyback controller 850.
In summary, LED television two-in-one electric source circuit provided by the invention, filtered after alternating current input through over commutation
After PFC, two independent power modules are split up into, one of them is LLC half-bridge resonance modules, the output of LLC resonance and LED light bar
The close voltage of voltage, through simple constant flow module（CCCV patterns）Or the CCCV constant flow modules carried by amplifier, by changing
Become the parameter of feedback circuit, it is primary to LLC by opto-coupled feedback, so as to reach the purpose of constant current.Another power module is
The stable 12V supply mainboard movements of simple circuit of reversed excitation, directly output are used.
LED television two-in-one electric source circuit provided by the invention has merged the excellent of traditional circuit and secondary LLC constant-current circuits
Point, specifically has the following advantages：
1st, the mainboard movement and backlight of 12V drivings（LED light bar）Two power module power supplies are split up into, power supplying efficiency is high,
Cost is low；
2nd, LLC controller is placed on primary, monitors resonance slot status in real time, and protection is complete；
3rd, it is few without driving transformer, the number of safety device.
The LED television two-in-one electric source circuit provided based on a upper embodiment, the present invention also provide a kind of LED television,
Including LED television two-in-one electric source circuit as described above.Due to the power work principle of the LED television, the skill of power supply
Art feature has elaborated in a upper embodiment, will not be repeated here.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (8)
1. a kind of LED television two-in-one electric source circuit, it is characterised in that including rectification filtering module, PFC module, circuit of reversed excitation
Module, LLC half-bridge resonances module, constant flow module, feedback module and LLC control modules；
The LLC half-bridge resonances module includes：
LLC metal-oxide-semiconductor units, for the output signal according to LLC control modules, the break-make of control LLC transformers；
LLC transformers, for being depressured and being powered for LED light bar；
First rectification filtering unit, the voltage for being inputted to LLC transformers carries out rectifying and wave-filtering, and exports to the LED
Bar；
The LLC control modules connect the LLC transformers by the LLC metal-oxide-semiconductors unit, and the LLC transformers pass through institute
State the first rectification filtering unit and connect the LED light bar；
The circuit of reversed excitation module includes：
Pipe unit is switched, for controlling the break-make of flyback transformer；
Flyback transformer, the voltage conversion for PFC module to be exported are the voltage needed for main trigger core；
Second rectification filtering unit, the voltage for being inputted to flyback transformer carries out rectifying and wave-filtering, and exports to the mainboard
Movement；
Feedback unit, for gathering the voltage of the mainboard movement, and export and give flyback controller；
Flyback controller, for the voltage fed back according to feedback unit, flyback electricity is realized by the break-make of controlling switch pipe unit
The voltage stabilizing output of road module；
The PFC module connects one end of the flyback transformer armature winding, the flyback transformer armature winding it is another
The output end of the end connection switch pipe unit, the secondary windings of the flyback transformer connect the feedback unit, also passed through
Second rectification filtering unit connects the mainboard movement；The feedback unit described in flyback controller connection by opening
Close the input of pipe unit；
Alternating current is carried out rectification and filtering by the rectification filtering module, is exported to PFC module；The PFC module is filtered to rectification
Direct current after ripple carries out PFC, and exports to LLC half-bridge resonances module and circuit of reversed excitation module；The LLC half
Bridge resonance modules are powered to LED light bar；The constant flow module samples the voltage and current of LED light bar, according to the voltage and current
The parameter of feedback module is adjusted, feedback module is exported high/low level signal according to the regulation of constant flow module and is controlled to the LLC
Module, the low and high level signal that the LLC control modules export according to feedback module, by LLC metal-oxide-semiconductor units to control
The break-make of LLC primary windings is stated, makes the electric current of LED light bar constant；The stable voltage of the circuit of reversed excitation module output
Powered to mainboard movement.
2. LED television two-in-one electric source circuit according to claim 1, it is characterised in that the LLC metal-oxide-semiconductors unit bag
Include the first metal-oxide-semiconductor and the second metal-oxide-semiconductor；The output end of the drain electrode connection PFC module of first metal-oxide-semiconductor and the LLC transformers
Armature winding one end, the source electrode of first metal-oxide-semiconductor connects the other end and second of the armature winding of the LLC transformers
The drain electrode of metal-oxide-semiconductor, the grid level of first metal-oxide-semiconductor connect the LLC control modules；The grid connection institute of second metal-oxide-semiconductor
State LLC control modules, the source ground of second metal-oxide-semiconductor.
3. LED television two-in-one electric source circuit according to claim 2, it is characterised in that the constant flow module includes perseverance
Flow Isobarically Control chip, first resistor, second resistance and 3rd resistor；One end of the first resistor is the constant flow module
The positive pole of voltage input end, the output end for connecting the first rectification filtering unit and LED light bar, the other end of the first resistor connect
Connect the VSENSE ends of constant current constant voltage control chip, be also grounded by second resistance；One end of the 3rd resistor is the constant current
The ISENSE ends of the current input terminal of module, the negative pole for connecting LED light bar and constant current constant voltage control chip, the 3rd resistor
The other end is grounded；The VCC ends of the constant current constant voltage control chip connect the output end of the circuit of reversed excitation module, and the constant current is permanent
The FB ends of control chip are pressed to connect the input of the feedback module, the GND ends and Ictrl ends of the constant current constant voltage control chip
Ground connection.
4. LED television two-in-one electric source circuit according to claim 3, it is characterised in that the feedback module includes the
One optocoupler, the 4th resistance and the 5th resistance；One end of 4th resistance is the input of the feedback module, the connection perseverance
The FB ends of Isobarically Control chip are flowed, the other end of the 4th resistance connects the second end of first optocoupler, first light
The first end of coupling connects the output end of the circuit of reversed excitation module；The 3rd end ground connection of first optocoupler, first optocoupler
The 4th end connect one end of the 5th resistance, the other end of the 5th resistance for the feedback module output end, connect institute
State the first input end of LLC control modules.
5. LED television two-in-one electric source circuit according to claim 4, it is characterised in that the power circuit also includes
Light-adjusting module, the light-adjusting module control the LLC half-bridge resonances module according to pwm signal by the LLC control modules
Output, realizes the light modulation to LED light bar.
6. LED television two-in-one electric source circuit according to claim 5, it is characterised in that the LLC control modules include
LLC control chips, the first diode and the first electric capacity；The VCC ends connection externally fed end of the LLC control chips；Described
The positive pole connection externally fed end of one diode and the VCC ends of the LLC control chips, the negative pole connection of first diode
The Vboot ends of the LLC control chips and one end of the first electric capacity, the other end of first electric capacity connect the LLC controls
The Mup ends of chip and the grid of the first metal-oxide-semiconductor；The HB ends of the LLC control chips connect source electrode, the 2nd MOS of the first metal-oxide-semiconductor
The drain electrode of pipe and the other end of LLC primary windings；The Mlow ends of the LLC control chips connect second metal-oxide-semiconductor
Grid；The RT ends of the LLC control chips are the first input end of LLC control modules, the other end of the 5th resistance of connection；Institute
The BO ends for stating LLC control chips are the second input of LLC control modules, the connection light-adjusting module, the LLC control chips
GND ends ground connection.
7. LED television two-in-one electric source circuit according to claim 6, it is characterised in that the light-adjusting module includes the
Six resistance, the 7th resistance, the 8th resistance, the second diode, the second optocoupler and the first triode：One end of 6th resistance connects
Connecing the output end of the circuit of reversed excitation module, the other end of the 6th resistance connects the first end of the second optocoupler, and described second
Second end of optocoupler connects the colelctor electrode of the first triode, the grounded emitter of first triode；Second optocoupler
3rd end is grounded, and the 4th end of second optocoupler connects the BO ends of the LLC control chips；The positive pole of second diode
End is provided for the input of the light-adjusting module, connection PWM dim signals, the negative pole of second diode passes through the 7th resistance
Connect the base stage of the first triode, also by the 8th resistance eutral grounding.
8. a kind of LED television, it is characterised in that including the LED television two-in-one electric as described in claim 1-7 any one
Source circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510332014.8A CN104935843B (en) | 2015-06-16 | 2015-06-16 | A kind of LED television two-in-one electric source circuit and LED television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510332014.8A CN104935843B (en) | 2015-06-16 | 2015-06-16 | A kind of LED television two-in-one electric source circuit and LED television |
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| CN104935843A CN104935843A (en) | 2015-09-23 |
| CN104935843B true CN104935843B (en) | 2018-03-20 |
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| CN201510332014.8A Active CN104935843B (en) | 2015-06-16 | 2015-06-16 | A kind of LED television two-in-one electric source circuit and LED television |
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| CN105491758A (en) * | 2015-12-11 | 2016-04-13 | 中山市尊宝实业有限公司 | New energy-efficiency standard energy-saving circuit with high power factor and ultra-low stand-by power consumption |
| CN105636268B (en) * | 2016-01-26 | 2018-05-18 | 宋家丽 | Led drive circuit and display device |
| CN106255266B (en) * | 2016-08-23 | 2018-03-13 | 深圳市华星光电技术有限公司 | A kind of drive circuit |
| CN106304492B (en) * | 2016-08-30 | 2019-12-10 | 康佳集团股份有限公司 | double-circuit constant current circuit and power supply device |
| CN106356179A (en) * | 2016-09-05 | 2017-01-25 | 深圳创维－Rgb电子有限公司 | LLC transformer, LLC switching power source and electrical equipment |
| CN106488607B (en) * | 2016-09-09 | 2018-04-10 | 深圳创维－Rgb电子有限公司 | Switching Power Supply and television set |
| CN106549588A (en) * | 2016-12-09 | 2017-03-29 | 深圳Tcl数字技术有限公司 | The power circuit and television set of television set |
| CN106849638B (en) * | 2017-02-24 | 2019-02-12 | 深圳市华星光电技术有限公司 | A kind of power circuit and liquid crystal display |
| CN107086026B (en) * | 2017-04-28 | 2019-11-08 | 康佳集团股份有限公司 | A kind of constant-current circuit and television set driving LED backlight |
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| CN109151351B (en) * | 2018-09-25 | 2021-06-01 | 深圳创维－Rgb电子有限公司 | Power panel and television |
| CN109547721B (en) * | 2018-12-25 | 2021-06-01 | 深圳创维－Rgb电子有限公司 | Television power supply driving device and television |
| CN111697848B (en) * | 2019-03-12 | 2021-09-07 | 海信视像科技股份有限公司 | Display device and power supply control method |
| CN111724747B (en) * | 2019-03-20 | 2021-10-22 | 海信视像科技股份有限公司 | Display device and power supply starting method |
| CN109819554A (en) * | 2019-04-02 | 2019-05-28 | 广州市新航科技有限公司 | A kind of high light intensity navigation obstacle lamp |
| CN110247455B (en) * | 2019-06-26 | 2023-10-27 | 深圳创维－Rgb电子有限公司 | Television set |
| CN112311220B (en) * | 2019-07-26 | 2023-08-01 | 惠州视维新技术有限公司 | PFC control circuit and power supply control device |
| CN110769173B (en) * | 2019-10-18 | 2022-04-01 | 深圳创维－Rgb电子有限公司 | Television power supply system and television |
| CN110971850B (en) * | 2019-12-05 | 2022-05-03 | 深圳创维－Rgb电子有限公司 | Constant-voltage constant-current switching power supply and television |
| CN114783384B (en) * | 2022-04-15 | 2023-10-03 | 深圳创维－Rgb电子有限公司 | Constant current driving circuit and display device |
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| JP5981337B2 (en) * | 2009-07-03 | 2016-08-31 | フィリップス ライティング ホールディング ビー ヴィ | Low cost power supply circuit and method |
| CN102523406B (en) * | 2011-12-07 | 2014-01-08 | 青岛海信电器股份有限公司 | Power circuit structure and LED liquid crystal television |
| JP6233568B2 (en) * | 2013-09-27 | 2017-11-22 | 東芝ライテック株式会社 | Power supply circuit and lighting device |
| CN103634542B (en) * | 2013-11-06 | 2019-08-13 | 深圳小佳科技有限公司 | A kind of power circuit of LCD TV |
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