CN106954315A - The driving power supply and television set of a kind of connection in series-parallel LED light bar network - Google Patents
The driving power supply and television set of a kind of connection in series-parallel LED light bar network Download PDFInfo
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- CN106954315A CN106954315A CN201710317914.4A CN201710317914A CN106954315A CN 106954315 A CN106954315 A CN 106954315A CN 201710317914 A CN201710317914 A CN 201710317914A CN 106954315 A CN106954315 A CN 106954315A
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
The invention discloses in a kind of driving power supply and television set of connection in series-parallel LED light bar network, driving power supply includes AC DC change-over circuits, filter circuit, pfc circuit, constant pressure source module and constant current source module, input ac power is converted to direct current through the AC DC change-over circuits, direct current is exported to pfc circuit after carrying out low-pass filtering treatment through the filter circuit, exported respectively to constant pressure source module and constant current source module after carrying out PFC through pfc circuit, corresponding constant voltage is provided according to standby signal for mainboard by constant pressure source module；By constant current source module the constant current that the sense of current alternately changes is provided for connection in series-parallel LED light bar network.It can realize that constant current constant voltage is exported simultaneously, constant pressure source provides constant voltage for mainboard, constant-current source output alternative expression supplies electricity to LED light bar, both movement constant pressure source demand had been met, also multi-channel LED lamp bar constant current demand is met, power supply conversion efficiency is improved, reduces system cost.
Description
Technical field
The present invention relates to appliances power source technical field, more particularly to a kind of driving power supply of connection in series-parallel LED light bar network and
Television set.
Background technology
With the development of technology, the popularization of energy-conservation Huimin policy, the raising of electrical equipment energy efficiency index standard, Energy Star will
Ask etc. increasingly by enterprises pay attention.Operationally, screen power consumption accounts for more than the 70% of Overall Power Consumption to current large-sized LED television,
Traditional TV set power framework is as shown in figure 1, the 24V of constant pressure out-put supply output need to give backlight after DC-DC boosts
Bar is powered, and this can make it that power supply conversion efficiency is low, and add the cost of constant current plate.
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 connection in series-parallel LED light bar network
Driving power supply and television set, can realize that constant current constant voltage is exported simultaneously, constant pressure source is that mainboard provides constant voltage, and constant-current source is exported
Alternative expression supplies electricity to LED light bar, has both met movement constant pressure source demand, also meets the constant current demand of multi-channel LED lamp bar, carries
High power supply conversion efficiency, greatly reduces system cost.
In order to achieve the above object, this invention takes following technical scheme：
A kind of driving power supply of connection in series-parallel LED light bar network, with connection in series-parallel LED light bar network connection, including AC-DC conversion electricity
Road, filter circuit and pfc circuit, it also includes constant pressure source module and constant current source module, and input ac power turns through the AC-DC
Circuit conversion is changed for direct current, the direct current is exported after carrying out low-pass filtering treatment through the filter circuit to pfc circuit, warp
Pfc circuit is exported to constant pressure source module and constant current source module respectively after carrying out PFC, by constant pressure source module according to treating
Machine signal provides corresponding constant voltage for mainboard；The sense of current is provided by constant current source module for connection in series-parallel LED light bar network to hand over
For the constant current of change.
In the driving power supply of described connection in series-parallel LED light bar network, the constant current source module includes driver element, constant current control
Unit processed, detection unit and rectification unit, connection in series-parallel LED light bar network include some groups by rectification unit LED in parallel
Bar group, every group of LED light bar group includes some LED light bars connected by detection unit；
Each in drive cycle, driver element alternately exports positive supply current and reverse successively in first half cycle and later half cycle
Supply current, is exported to LED light bar after rectified unit rectification, and the electric current of LED light bar is detected by detection unit, and will be detected
Electric current be converted to voltage signal and export to constant-current control unit, controlled to drive according to the voltage signal by constant-current control unit
The working frequency of unit, makes the size of supply current remain constant.
In the driving power supply of described connection in series-parallel LED light bar network, the constant pressure source module includes pwm control circuit and anti-
Violent change depressor, the pwm control circuit exports corresponding constant voltage according to the standby signal control flyback transformer received
To mainboard.
In the driving power supply of described connection in series-parallel LED light bar network, the driver element includes LLC resonance bridge, LLC transformations
Device and balancer, positive supply current and reverse power supply are alternately exported by LLC transformers successively in first half cycle and later half cycle
Electric current, is exported to rectification unit after balancer partial pressure, and LLC resonance bridges are controlled according to the voltage signal by constant-current control unit
Working frequency, the size of supply current that LLC transformers are exported is remained constant.
In the driving power supply of described connection in series-parallel LED light bar network, the constant current source module also includes isolating transformer, institute
State the drive signal driving LLC resonance bridge work that isolating transformer is exported according to constant-current control unit.
In the driving power supply of described connection in series-parallel LED light bar network, the LLC resonance bridge includes the first metal-oxide-semiconductor, second
Metal-oxide-semiconductor, inductance and the first electric capacity, the balancer include the second electric capacity；The drain electrode connection pfc circuit of first metal-oxide-semiconductor
First output end, the grid of first metal-oxide-semiconductor connects the 5th pin of isolating transformer, the source electrode connection of first metal-oxide-semiconductor every
From the 1st pin of the 4th pin of transformer, the drain electrode of the second metal-oxide-semiconductor and LLC transformers；The grid connection isolation of second metal-oxide-semiconductor
1st pin of transformer, the source electrode of second metal-oxide-semiconductor connects the 2nd pin and ground of LLC transformers；One end of first electric capacity
By the 2nd pin of inductance connection LLC transformers, the other end of first electric capacity is grounded；3rd pin of the LLC transformers leads to
Overbalance device connects the 1st end of rectification unit, and the 4th pin of the LLC transformers connects the 2nd end of rectification unit.
In the driving power supply of described connection in series-parallel LED light bar network, the detection unit includes first resistor and the second electricity
Resistance, every group of LED light bar group includes the first lamp bar unit and the second lamp bar unit, one end connection all first of the first resistor
The negative pole of lamp bar unit and one end of second resistance, the other end of the first resistor are connecting all second lamp bar units just
Pole；The other end connection constant-current control unit of the second resistance.
In the driving power supply of described connection in series-parallel LED light bar network, the rectification unit includes the first diode, the two or two
Pole pipe, the 3rd diode and the 4th diode；The LED light bar group includes Part I lamp bar group and Part II lamp bar group；
The positive pole of first diode connects the negative pole of the second diode, also connects the 3rd of the LLC transformers the by balancer
Pin, the negative pole of first diode connects the positive pole of the Part I lamp bar group；The positive pole connection of second diode
The negative pole of the Part II lamp bar group；The positive pole of 3rd diode connects the 4th pin and the four or two of the LLC transformers
The negative pole of pole pipe, the negative pole of the 3rd diode connects the positive pole of the Part II lamp bar group；4th diode
Positive pole connects the negative pole of the Part I lamp bar group.
In the driving power supply of described connection in series-parallel LED light bar network, the constant-current control unit includes current constant control chip,
The STB ends connection ENA signal ends of the current constant control chip, the PWM_IN ends connection ADJ signal ends of the current constant control chip,
The IS ends of the current constant control chip connect the detection unit, the N1 ends connection isolating transformer of the current constant control chip
6th pin, the N2 ends of the current constant control chip connect the 7th pin of isolating transformer.
A kind of television set, it includes the driving power supply of connection in series-parallel LED light bar network as described above.
It is described in the driving power supply and television set of the connection in series-parallel LED light bar network provided compared to prior art, the present invention
The driving power supply of connection in series-parallel LED light bar network includes AC-DC change-over circuits, filter circuit, pfc circuit, constant pressure source module and perseverance
Source module is flowed, input ac power is converted to direct current through the AC-DC change-over circuits, and the direct current is through the filter circuit
Export to pfc circuit, exported respectively to constant pressure source mould after carrying out PFC through pfc circuit after carrying out low-pass filtering treatment
Block and constant current source module, corresponding constant voltage is provided by constant pressure source module according to standby signal for mainboard；By constant current source module
The constant current that the sense of current alternately changes is provided for connection in series-parallel LED light bar network.It can realize that constant current constant voltage is exported simultaneously, constant pressure
Source provides constant voltage for mainboard, and constant-current source output alternative expression supplies electricity to LED light bar, both met movement constant pressure source demand,
The constant current demand of multi-channel LED lamp bar is met, power supply conversion efficiency is improved, greatly reduces system cost.
Brief description of the drawings
Fig. 1 is TV set power block architecture diagram in the prior art；
The structured flowchart of the driving power supply preferred embodiment for the connection in series-parallel LED light bar network that Fig. 2 provides for the present invention；
The circuit diagram of constant current source module in the driving power supply for the connection in series-parallel LED light bar network that Fig. 3 provides for the present invention；
The circuit diagram of LED light bar and detection unit in the driving power supply for the connection in series-parallel LED light bar network that Fig. 4 provides for the present invention.
Embodiment
The present invention provides the driving power supply and television set of a kind of connection in series-parallel LED light bar network, and constant current constant voltage can be realized simultaneously
Output, constant pressure source provides constant voltage for mainboard, and constant-current source output alternative expression supplies electricity to LED light bar, both met movement constant pressure
Source demand, also meets the constant current demand of multi-channel LED lamp bar, improves power supply conversion efficiency, greatly reduce system cost.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
The driving power supply for the connection in series-parallel LED light bar network that the present invention is provided can be applicable in multi-field different electrical power, example
Such as TV set power, display power supply, LED illumination power supply, projecting apparatus and medicine equipment field, effectively improve power supply system
System efficiency, reduces cost.
Referring to Fig. 2, the driving power supply of connection in series-parallel LED light bar network that the present invention is provided include AC-DC change-over circuits 10,
Filter circuit 20, pfc circuit 30, constant pressure source module 40 and constant current source module 50, the AC-DC change-over circuits 10, filter circuit
20th, pfc circuit 30 is sequentially connected, the first output end connection constant current source module 50 of the pfc circuit 30, the pfc circuit 30
The second output end connection constant pressure source module 40, it is its power supply, the constant-current source mould that the constant pressure source module 40, which is also connected with mainboard,
Block 50 is also connected with connection in series-parallel LED light bar network, and constant-current source is provided for it.During specific implementation, input ac power is through the AC-DC
Change-over circuit 10 is converted to direct current, and the direct current is exported to PFC after carrying out low-pass filtering treatment through the filter circuit 20
Circuit 30, is exported to constant pressure source module 40 and constant current source module 50, by perseverance respectively after carrying out PFC through pfc circuit 30
Potential source module 40 provides corresponding constant voltage according to standby signal for mainboard；It is connection in series-parallel LED light bar by constant current source module 50
Network provides the constant current that the sense of current alternately changes.
It is to be understood that the AC-DC change-over circuits 10, filter circuit 20, pfc circuit 30 are prior art, it is right herein
Its function and connected mode are not described further.In the present invention, the output two-way voltage of pfc circuit 30, all the way by constant pressure source module 40
Corresponding constant voltage is provided for mainboard according to standby signal after processing, another road is supplied to constant current source module 50, exports it
Alternative expression constant current-supplying gives connection in series-parallel LED light bar network, while realizing constant current constant voltage output, both having met movement constant pressure needs
Ask, also meet multi-channel LED lamp bar constant current demand, and Power convert effect is also improved by exporting alternative expression constant current-supplying
Rate, reduces system cost.
Specifically, constant pressure source module 40 includes pwm control circuit 41 and flyback transformer 42, the pwm control circuit 41
Connect flyback transformer 42, the second output end and mainboard of the connection of flyback transformer 42 pfc circuit 30, the PWM controls
Circuit 41 exports corresponding constant voltage to mainboard according to the standby signal control flyback transformer 42 received, ought specially treat
When machine signal is high level, the work rated voltage needed for the control output mainboard of flyback transformer 42 of pwm control circuit 41 makes master
Plate normal work；When standby signal is low level, then needed for the control of pwm control circuit 41 flyback transformer 42 output mainboard
Standby voltage, it is far below work rated voltage, according to the corresponding constant voltage of different stand signal output, reduces system
Overall power.It is to be understood that the pwm control circuit 41 and flyback transformer 42 are prior art, herein to its function and
Connected mode is not described further.
The constant current source module 50 includes driver element 51, constant-current control unit 52, detection unit 53 and rectification unit 54,
The first output end and rectification unit 54 of the connection of driver element 51 pfc circuit 30, the constant-current control unit 52 connect institute
Driver element 51 and detection unit 53 are stated, wherein, connection in series-parallel LED light bar network includes some groups by the parallel connection of rectification unit 54
LED light bar group, every group of LED light bar group includes some LED light bars connected by detection unit 53, i.e., as shown in Fig. 2
LED1, LED2, LED3 and LED4 represent four lamp bars, and wherein LED3 lamp bars are used as by detection unit 53 and the series connection of LED1 lamp bars
One group of LED light bar group, LED4 lamp bars are used as another set LED light bar group by detection unit 53 and the series connection of LED2 lamp bars, and this two
Group LED lamp bars group is in parallel by rectification unit 54, it is to be understood that the present invention is not construed as limiting to the quantity of LED light bar, factory
Family can be needed flexibly to be selected according to specific product, and in preferred embodiments below, LED light bar quantity is solved with four
Release explanation.
Under the control of constant-current control unit 52, in each drive cycle, driver element 51 is in first half cycle and second half
Phase alternately exports positive supply current and reverse power supply electric current successively, exports to LED light bar, that is, drives after the rectified rectification of unit 54
Moving cell 51 is in first half cycle drive part LED light bar, in later half Periodic signal drive remainder LED light bar, while driving
Cheng Zhong, the electric current of LED light bar is detected by detection unit 53, and the electric current detected is converted into voltage signal exports to constant current control
Unit 52 processed, the working frequency of driver element 51 is controlled by constant-current control unit 52 according to the voltage signal so that driving is single
The supply current size of the output of member 51 remains constant, reaches the purpose of constant current driving.Due to the supply current of all lamp bars
Under the vibrational control of driver element 51, driver element 51 alternately provides power supply in opposite direction successively within each cycle
Electric current so that part LED light bar is lit in first half cycle, remainder LED light bar is lit in the later half cycle, when driving is single
Member 51 working frequency it is sufficiently high, make drive cycle be less than human eye retentivity time of eye when（Such as 50Hz）, then regarded from human eye
The LED light bar seen in feel is that normal bright state meets the constant current demand of multi-channel LED lamp bar, and improves Power convert effect
Rate.
Specifically, the constant-current driven module also includes isolating transformer 55, and the driver element 51 includes LLC resonance
Bridge 511, LLC transformers 512 and balancer 513, it is humorous that the constant-current control unit 52 connects the LLC by isolating transformer 55
Shake bridge 511, and the LLC resonance bridge 511 is also connected with the first output end and LLC transformers 512 of pfc circuit 30, the LLC transformations
Device 512 also connects rectification unit 54 by balancer 513.
The constant-current control unit 52 is after the voltage signal of the output of detection unit 53 is received, according to the voltage signal
Output drive signal drives LLC resonance bridge 511 to be carried out with corresponding working frequency to isolating transformer 55 by isolating transformer 55
Vibrational control, the size of the supply current of the output of control LLC transformers 512 remains constant, while by LLC transformers 512
Positive supply current and reverse power supply electric current are alternately exported successively in first half cycle and later half cycle, after the partial pressure of balancer 513
Output is exported to corresponding LED light bar to rectification unit 54, provides constant to corresponding LED light bar in the different time
Electric current, meets the constant current demand of large size TV multichannel lamp bar, power supply conversion efficiency is improved, while in LLC transformers 512
One balancer 513 of series connection after output, by the pressure difference partial pressure of LED light bar in parallel at the two ends of balancer 513 so that flow through LED
All the time position, in steady state, solves the problems, such as the inconsistent constant current-supplying of multi-channel LED lamp bar voltage to the electric current of lamp bar.
Further, also referring to Fig. 3 and Fig. 4, several LEDs 11 ... LED19 composition LED1 lamp bars,
Several LEDs 21 ... LED29 constitutes LED2 lamp bars, several LEDs 31 ... LED39 compositions LED3
Lamp bar, several LEDs 41 ... LED49 composition LED4 lamp bars.In the present invention, a plurality of LED light bar is single by detecting
Member 53 and rectification unit 54 constitute series-parallel network, and direct drive LED light bar is exported by efficient LLC resonance bridge 511, and in PFC
Another output end connection flyback sourse of circuit 30 provides constant voltage for mainboard, while realizing that constant current constant voltage is exported, drops significantly
Low system cost.
Wherein, the LLC resonance bridge 511 includes the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, inductance L1 and the first electric capacity C1,
The balancer 513 includes the second electric capacity C2；First output end of the drain electrode connection pfc circuit 30 of the first metal-oxide-semiconductor M1, institute
The grid for stating the first metal-oxide-semiconductor M1 connects the 5th pin of isolating transformer 55, the source electrode connection isolation transformation of the first metal-oxide-semiconductor M1
1st pin of the 4th pin of device 55, the second metal-oxide-semiconductor M2 drain electrode and LLC transformers 512；The grid connection of the second metal-oxide-semiconductor M2
1st pin of isolating transformer 55, the 2nd pin and ground of the source electrode connection LLC transformers 512 of the second metal-oxide-semiconductor M2；Described first
Electric capacity C1 one end passes through the 2nd pin of inductance L1 connection LLC transformers 512, the other end ground connection of the first electric capacity C1；It is described
3rd pin of LLC transformers 512 connects the 1st end of rectification unit 54, the 4th pin of the LLC transformers 512 by balancer 513
Connect the 2nd end of rectification unit 54.In the present embodiment, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 are N-channel MOS pipe.
The detection unit 53 includes first resistor R1 and second resistance R2, and every group of LED light bar group includes the first lamp bar list
Member and the second lamp bar unit, such as in the present embodiment, LED1 lamp bars and LED3 lamp bars are one group of LED light bar group, LED2 lamp bars and
LED4 lamp bars are another set lamp bar group, and the first lamp bar unit and the second lamp bar unit are included in two groups of lamp bar groups, wherein,
LED3 lamp bars and LED4 lamp bars are respectively as the first lamp bar unit in two LED light bar groups, LED1 lamp bars and LED2 lamp bars point
Not as the second lamp bar unit in two LED light bar groups, one end of the first resistor R1 connects all first lamp bar units
Negative pole and second resistance R2 one end, the other end of the first resistor R1 connects the positive pole of all second lamp bar units；Institute
State second resistance R2 other end connection constant-current control unit 52.By first resistor R1 detect LED light bar electric current and please be by
It is converted to voltage signal, is afterwards exported voltage signal to constant-current control unit 52, current constant control list by second resistance R2
Member 52 accordingly adjusts the working frequency of LLC resonance bridge 511 according to the voltage signal, LLC transformers 512 is remained constant current
Output.
Further, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4；Institute
Stating LED light bar group includes Part I lamp bar group and Part II lamp bar group, and Part I lamp bar group and the second lamp bar group pass through
Rectification unit 54 is in parallel, such as in the present embodiment, Part I lamp bar group is made up of LED1 lamp bars and LED3 lamp bars, Part II
Lamp bar group is made up of LED2 lamp bars and LED4 lamp bars, the second diode D2 of positive pole connection of the first diode D1 negative pole,
The 3rd pin of the LLC transformers 512, the negative pole connection described first of the first diode D1 are also connected by balancer 513
The positive pole of part lamp bar group；The positive pole of the second diode D2 connects the negative pole of the Part II lamp bar group；Described 3rd
Diode D3 positive pole connects the 4th pin of the LLC transformers 512 and the 4th diode D4 negative pole, the 3rd diode
D3 negative pole connects the positive pole of the Part II lamp bar group；The positive pole of the 4th diode D4 connects the Part I lamp
The negative pole of bar group.
Preferably, the rectification unit 54 also includes the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity
C6, the 7th electric capacity C7 and the 8th electric capacity C8, one end of the 3rd electric capacity C3 connect the first diode D1 negative pole, the 4th electric capacity
C4 one end and the positive pole of Part I lamp bar group（The positive pole of LED3 lamp bars）, the negative pole connection first of the 3rd electric capacity C3
Divide the negative pole of lamp bar group（The negative pole of LED1 lamp bars）；The other end ground connection of the 4th electric capacity C4；The one of the 5th electric capacity C5
End connects the negative pole of the second diode D2 positive pole, the 6th electric capacity C6 one end and Part II lamp bar group（LED2 lamp bars it is negative
Pole）, the 7th electric capacity C7 of other end connection of the 5th electric capacity C5 one end；The other end ground connection of the 6th electric capacity C6；Institute
The one end for stating the 7th electric capacity C7 is also connected with the 3rd diode D3 negative pole and the positive pole of Part II lamp bar group（LED4 lamp bars are just
Pole）, the other end ground connection of the 7th electric capacity C7；One end of the 8th electric capacity C8 connects the 4th diode D4 positive pole and the
The negative pole of a part of lamp bar group（The negative pole of LED1 lamp bars）, the other end ground connection of the 8th electric capacity C8.By the 3rd electric capacity C3,
4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7 and the 8th electric capacity C8 are each LED light bar voltage filter, are subtracted
The ripple voltage of few LED light bar.
Under the vibrational control of LLC resonance bridge 511, LLC transformers 512 export alternate positive supply current successively and anti-
To supply current, wherein, the positive supply current of the first half cycle of LLC transformers 512 output, i.e. now the 3rd of LLC transformers 512
Pin is just, supply current is LED3 lamp bars and LED1 lamp bars by the second electric capacity C2, the first diode D1 and the 4th diode D4
Power supply, current path now be by the 3rd pin of LLC transformers 512 flow through the second electric capacity C2, the first diode D1 export to
LED3 lamp bars, afterwards by passing through the 4th diode D4 returns to LLC transformers 512 after first resistor R1 and LED1 lamp bar
4 pin, now LED1 lamp bars and LED3 lamp bars light, and rectification unit 54 flow direction limitation under, LED2 lamp bars and LED4 lamp bars
In there is no electric current to pass through, be OFF state；The reverse power supply electric current of output of the later half cycle of LLC transformers 512 afterwards, i.e., now LLC
4th pin of transformer 512 is just, supply current is LED4 by the 3rd diode D3, the second diode D2 and the second electric capacity C2
Lamp bar and LED2 lamp bars are powered, and current path now is to flow through the 3rd diode D3 outputs by the 4th pin of LLC transformers 512
To LED4 lamp bars, LLC is returned to by passing through the second diode D2, the second electric capacity C2 after first resistor R1 and LED2 lamp bar afterwards
3rd pin of transformer 512, now LED2 lamp bars and LED4 lamp bars light, and rectification unit 54 flow direction limitation under, LED1 lamps
There is no electric current to pass through in bar and LED3 lamp bars, be OFF state.Therefore the supply current of all LED light bars is handed under vibrational control
For lighting and extinguishing, when the working frequency of LLC resonance bridge 511 is more than preset value, the LED that human eye vision is seen is Chang Liangzhuan
State, improves power supply conversion efficiency, reduces system cost.
Further, the constant-current control unit 52 includes current constant control chip U1, the STB of the current constant control chip U1
End connection ENA signal ends, the PWM_IN ends connection ADJ signal ends of the current constant control chip U1, the current constant control chip U1
IS ends connect the detection unit 53, the N1 ends of the current constant control chip U1 connect the 6th pin of isolating transformer 55, described
Current constant control chip U1 N2 ends connect the 7th pin of isolating transformer 55.Preferably, in current constant control chip U1 and isolation transformation
3rd resistor R3, the 4th resistance R4, the 9th electric capacity C9 and the tenth electric capacity C10, the 3rd resistor R3 are additionally provided with before device 55
One end connect the 7th pin of isolating transformer 55, the other end of the 3rd resistor R3 passes through the 9th electric capacity C9 connection constant current controls
Coremaking piece U1 N2 ends；One end of the 4th resistance R4 connects the 6th pin of isolating transformer 55, the 4th resistance R4's
The N1 ends that the other end passes through the tenth electric capacity C10 connection current constant control chips U1.The 3rd resistor R3, the 4th resistance R4,
Nine electric capacity C9 and the tenth electric capacity C10 mainly play current limliting filter action.In the present embodiment, the constant-current driven chip is using rom
BD9412 chips, it possesses the control functions such as LLC controls, constant current adjustment, EN, PWM, and other are also can select certainly has identical work(
The control chip of energy, this is not limited by the present invention.
First resistor R1 is converted to the electric current detected after voltage signal, is exported by second resistance R2 to current constant control
Chip U1 IS ends, current constant control chip U1, to isolating transformer 55, passes through isolation by N1 ends and N2 ends output drive signal
Transformer 55 drives the LLC resonance bridge 511 of primary side, the working frequency of control LLC transformers 512, and then controls LLC transformers
512 output constant currents.And current constant control chip U1 receives EN signals and pwm signal by STB ends and PWM_IN sections respectively,
When EN signals and pwm signal are low level, constant-current control unit 52 is stopped, now without constant current output；When EN signals and
When pwm signal is high level, constant-current control unit 52 is started working, and the LLC resonance bridges of primary side are driven by isolating transformer 55
511, and then control LLC transformers 512 to export.Wherein EN signals are the signal that is switched on and off of constant-current control unit 52, PWM letters
The driving frequency that number control constant-current control unit 52 is exported, pwm signal controls LLC resonance bridge 511 after constant-current control unit 52,
And then LLC transformers 512 are controlled, and the finally brightness of control LED light bar, when the dutycycle of pwm signal is bigger, LED light bar
Brightness is higher, otherwise then lower, meets the function of LLC output brightness light modulations, and current constant control chip U1 is placed on into secondary
The security of power supply is also improved, is difficult to be disturbed by surge.
Preferably, directly it is also associated with being used to drive the LLC resonance bridge in isolating transformer 55 and LLC resonance bridge 511
511 drive circuit, the drive circuit includes the 5th diode D5, the 6th diode D6, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the first triode Q1 and the second triode Q2；Root
According to the level signal of the output pin of isolating transformer 55, the first triode Q1 and the second triode Q2 ON-OFF shape is controlled
State, and then control the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 working condition to realize LLC vibrational controls.
Wherein, the positive pole of the 5th diode D5 connects the 5th resistance R5 one end and the 5th pin of isolating transformer 55,
The negative pole of the 5th diode D5 passes through the resistance R7 of the 6th resistance R6 connections the 7th one end and the first metal-oxide-semiconductor M1 grid；
The other end of the 5th resistance R5 connects the first triode Q1 base stage；The other end connection the one or three of the 7th resistance R7
Pole pipe Q1 emitter stage；The colelctor electrode of the first triode Q1 connects the 4th pin of isolating transformer 55；6th diode
D6 positive pole connects the 8th resistance R8 one end and the 1st pin of isolating transformer 55, and the negative pole of the 6th diode D6 passes through
The resistance R10 of 9th resistance R9 connections the tenth one end and the second metal-oxide-semiconductor M2 grid；The other end connection of the 8th resistance R8
Second triode Q2 base stage；The other end of the tenth resistance R10 connects the second triode Q2 emitter stage；Described 1st
Pole pipe Q1 grounded collector.
The present invention correspondingly provides a kind of television set, and it includes the driving electricity of connection in series-parallel LED light bar network as described above
Source, because the driving power supply above to the connection in series-parallel LED light bar network is described in detail, is not described further herein.
For a better understanding of the present invention, below in conjunction with Fig. 2 to Fig. 4, the string provided for concrete application embodiment the present invention
The course of work of the driving power supply of parallel connection LED lamp bar network is described in detail：
In current constant control, under LLC current constant controls, the first half cycle that LLC transformers 512 are exported passes through the electricity of balancer 513 second
Hold LED3 lamp bars and LED1 lamp bars that C2, the first diode D1 and the 4th diode D4 supply electricity to series connection, the electricity of detection resistance first
The electric current detected is converted into voltage signal by resistance R1, and current constant control chip U1 the 6th pin is conveyed to by second resistance R2, permanent
The working frequency of flow control chip U1 control LLC resonance bridge 511, and then LLC transformers 512 is exported constant current, it is LED3
Lamp bar and LED1 lamp bars provide constant operating current.Now LED4 lamp bars under the flow direction limitation of rectifier bridge, LED2 lamp bars do not have
Have by electric current, for the state of going out.The later half cycle that LLC transformers 512 are exported by the 3rd diode D3, the second diode D2 and
The electric capacity C2 of balancer 513 second supplies electricity to the LED4 lamp bars and LED2 lamp bars of series connection, and first resistor R1 turns the electric current detected
Voltage signal is turned to, current constant control chip U1 the 6th pin, current constant control chip U1 controls LLC are conveyed to by second resistance R2
The working frequency of resonance bridge 511, and then LLC transformers 512 is exported constant current, it is that LED4 lamp bars and LED2 lamp bars provide perseverance
Fixed operating current.Now rectifier bridge flow direction limitation under LED3 lamp bars, LED1 lamp bars are not over electric current, for the state of going out.
Above-mentioned all lamp bar supply currents are alternately lighted under LLC vibrational control, because the working frequency of LLC resonance bridge 511 is higher,
Preferably greater than it is equal to 50Hz, therefore the frequency alternately lighted is higher, then LED seen by person is normal bright state.A plurality of LED
Bar constitutes series-parallel network by detection unit 53 and rectification unit 54, and direct drive LED is exported by efficient LLC resonance bridge 511
Lamp bar, meets the constant current demand of large size TV multichannel, improves power supply conversion efficiency, greatly reduce system cost.
Further, current constant control chip U1 control process is specially when the electric current for flowing through LED light bar is larger then the
The voltage that one resistance R1 conversions are obtained is bigger, and it feeds back to current constant control chip U1 the 6th pin, passes through current constant control chip U1
Internal reference compares adjustment so that the driving frequency increase of current constant control chip U1 the 17th, 18 pin output, and then passes through isolation
The switching frequency increase of the control LLC resonance of transformer 55 bridge 511, the then electric current exported is reduced, that is, the electric current for flowing through LED light bar subtracts
It is small, on the contrary then increase, so that it is constant by the electric current of LED light bar, realize that constant current drives.
Further, because of lamp bar LED3 lamp bars in parallel, LED1 lamp bars and LED4 lamp bars, the voltage differences of LED2 lamp bars compared with
Greatly, it can make it that the voltage that LLC transformers 512 are exported is inconsistent, and then cause the electric current for flowing through a two big cluster of lamps, ornamental inconsistent, therefore this
Invention series connection one balancer 513, i.e. second electric capacity C2 after the output of LLC transformers 512, by the voltage difference partial pressure of LED light bar
At the two ends of balancer 513 so that even if the LED pressure difference that rectifier bridge output connects is larger, and the electric current for flowing through lamp bar is still maintained at
Constant current state.Solve the problems, such as the inconsistent power supply constant current of multichannel lamp bar voltage.
Specifically, the second electric capacity C2 can make to flow through LED1 as balancer 513 ... LED1n groups and LED2 ... LED2n
The electric current of group is equal, and its operation principle is that LED1 lamp bars group is than LED4 lamp bar, when LED2 lamp bar group voltages are big when LED3 lamp bars,
I.e. LLC transformers 512T2 first half cycles are exported, and LLC the 12nd pin is timing, the second electric capacity C2 2 pin voltages is more than 1 pin
Voltage；At the lower half cycle, LLC transformers 512T2 the 12nd pin is negative, and the second electric capacity C2 2 pin voltages are less than 1 pin voltage, such as
On two cluster of lamps, ornamental bar voltage differentials are pressed in the second electric capacity C2 two ends, and then make to flow through LED3 lamp bars, LED1 lamp bars group and LED4 lamps
Bar, the electric current of LED2 lamp bar groups is equal, realizes that two-way flows.
Further, the present invention by EN signals and PWM dim signals control current constant control chip U1 working condition with
And the brightness of LED light bar.When EN signals and PWM dim signal low levels, current constant control chip U1 is stopped, and no constant current is defeated
Go out.When EN signals and PWM dim signals are high level, current constant control chip U1 starts working, and is driven by isolating transformer 55
The LLC resonance bridge 511 of dynamic primary side, and then control LLC transformers 512 to export.
As further described above, EN signals are the current constant control chip U1 signal that is switched on and off, pwm signal control constant current
Control chip U1 driving frequency, controls the working frequency of LLC resonance bridge 511, and then control the defeated of LLC transformers 512 afterwards
Go out power, finally control the brightness case of LED light bar.When PWM duty cycle increase, the driving frequency of current constant control chip U1 outputs
Reduce, the working frequency of control LLC resonance bridge 511 is reduced, the power output of LLC transformers 512 increase, that is, the electric current exported is got over
Greatly, then LED light bar brightness is higher, otherwise then lower, meets LLC output brightness dimming functions.
And in Isobarically Control, when standby signal is high level, the control flyback transformer 42 of pwm control circuit 41 is exported
Work rated voltage needed for mainboard, makes mainboard normal work；When standby signal is low level, then pwm control circuit 41 is controlled
Standby voltage needed for the output of flyback transformer 42 mainboard processed, it is far below work rated voltage, defeated according to different stand signal
Go out corresponding constant voltage, reduce the overall power of system.
The driving process of LLC resonance bridge 511 is described below：The one or three pole when 5 pin of isolating transformer 55 are low level
Pipe Q1 is turned on, and the first triode Q1, the 5th resistance R5, the 7th resistance R7 constitutes the first metal-oxide-semiconductor M1 turn-off circuit, the first MOS
Pipe M1 GS voltages are 0, the first metal-oxide-semiconductor M1 shut-offs；1 pin of isolating transformer 55 is high level, and the second triode Q2 ends,
Signal is by the 6th diode D6, and it is high level that the 9th resistance R9, which controls the second metal-oxide-semiconductor M2 GS voltages, and the second metal-oxide-semiconductor M2 is opened
It is logical.When 5 pin of isolating transformer 55 are high level, the first triode Q1 ends, and signal passes through the 5th diode D5, the 6th electricity
It is high level that resistance R6, which controls the first metal-oxide-semiconductor M1 GS voltages, and the first metal-oxide-semiconductor M1 is open-minded；1 pin of isolating transformer 55 is low electricity
Flat, the second triode Q2 is open-minded, and the second triode Q2, the 8th resistance R8, the tenth resistance R10 constitutes the second metal-oxide-semiconductor M2 shut-off
Loop, the second metal-oxide-semiconductor M2 GS voltages are 0, the second metal-oxide-semiconductor M2 shut-offs.That is current constant control chip U1 is by controlling isolation transformation
Switching tube in the driving LLC resonance of device 55 bridge 511, and then control output current.
Further, resonance bridge is when the first metal-oxide-semiconductor M1 will be turned on, and the voltage in the first metal-oxide-semiconductor M1 junction capacity declines
Body diode to zero, first metal-oxide-semiconductor M1 is begun to turn on so that the first metal-oxide-semiconductor M1 drain-source（DS）Voltage across poles is zero, is
One metal-oxide-semiconductor M1 ZVS creates condition.When the first metal-oxide-semiconductor M1 body diode conducting, resonance current iL2 starts with sine
Electric current in form increase, this stage inductance L1 is more than the electric current in Lm, and both differences flow through the primary of LLC transformers 512, secondary
Level the first diode of commutation diode D1 is begun to turn on, and Lm charges in the process, and only inductance L1 and the first electric capacity C1 are participated in
Resonance.
To the first metal-oxide-semiconductor M1 turn-on instants, the first metal-oxide-semiconductor M1 signal is high level.First metal-oxide-semiconductor M1 no-voltages
Conducting.Now the electric current in inductance L1 rises, and still above the electric current in Lm, the two difference flows through primary, rectification
The first diode of diode D1 is held on.
When the electric current in inductance L1 increase to it is equal with the electric current in Lm, no electric current flow through LLC transformers 512 just
Level, the first diode D1 electric current is zero, zero-current switching, therefore the first diode D1 is almost without reversely restoring process.This
When Lm participate in resonance, Lm and inductance L1, the first electric capacity C1 constitute a series resonant tank.
When being turned off to the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 still maintains shut-off, at this moment into Dead Time.Resonance current
Junction capacity to the first metal-oxide-semiconductor M1 charges, while the junction capacity to the second metal-oxide-semiconductor M2 is discharged.Now the electric current in Lm is more than electricity
Feel the electric current in L1, both differences flow through the primary of LLC transformers 512, the 3rd diode D3 conductings, to the second metal-oxide-semiconductor M2's
Junction capacity electric discharge terminates, several stages afterwards, the second metal-oxide-semiconductor M2 mode of operations and the first metal-oxide-semiconductor M1 classes in preceding several stages
Seemingly, no longer repeat here.Analyzed more than, when the first metal-oxide-semiconductor of switching tube M1, the second metal-oxide-semiconductor M2 are turned on, voltage between its DS
All close to zero, and during switching tube shut-off it is capacitive shut-off, therefore switching tube is operated in ZVT（ZVS）State.
In summary, in the driving power supply and television set of the connection in series-parallel LED light bar network that the present invention is provided, the connection in series-parallel
The driving power supply of LED light bar network includes AC-DC change-over circuits, filter circuit, pfc circuit, constant pressure source module and constant-current source mould
Block, input ac power is converted to direct current through the AC-DC change-over circuits, and the direct current carries out low through the filter circuit
Export to pfc circuit, exported respectively to constant pressure source module and perseverance after carrying out PFC through pfc circuit after pass filter processing
Source module is flowed, corresponding constant voltage is provided according to standby signal for mainboard by constant pressure source module；It is to go here and there simultaneously by constant current source module
Join LED light bar network and the constant current that the sense of current alternately changes is provided.It can realize that constant current constant voltage is exported simultaneously, based on constant pressure source
Plate provides constant voltage, and constant-current source output alternative expression supplies electricity to LED light bar, both met movement constant pressure source demand, also met
The constant current demand of multi-channel LED lamp bar, improves power supply conversion efficiency, greatly reduces system cost.
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 or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (10)
1. a kind of driving power supply of connection in series-parallel LED light bar network, with connection in series-parallel LED light bar network connection, including AC-DC conversion electricity
Road, filter circuit and pfc circuit, it is characterised in that also including constant pressure source module and constant current source module, input ac power is through institute
State AC-DC change-over circuits and be converted to direct current, the direct current exported after carrying out low-pass filtering treatment through the filter circuit to
Pfc circuit, is exported to constant pressure source module and constant current source module, by constant pressure source respectively after carrying out PFC through pfc circuit
Module provides corresponding constant voltage according to standby signal for mainboard；There is provided by constant current source module for connection in series-parallel LED light bar network
The constant current that the sense of current alternately changes.
2. the driving power supply of connection in series-parallel LED light bar network according to claim 1, it is characterised in that the constant-current source mould
Block includes driver element, constant-current control unit, detection unit and rectification unit, and connection in series-parallel LED light bar network includes some groups and led to
Over commutation unit LED light bar group in parallel, every group of LED light bar group includes some LED light bars connected by detection unit；
Each in drive cycle, driver element alternately exports positive supply current and reverse successively in first half cycle and later half cycle
Supply current, is exported to LED light bar after rectified unit rectification, and the electric current of LED light bar is detected by detection unit, and will be detected
Electric current be converted to voltage signal and export to constant-current control unit, controlled to drive according to the voltage signal by constant-current control unit
The working frequency of unit, makes the size of supply current remain constant.
3. the driving power supply of connection in series-parallel LED light bar network according to claim 1, it is characterised in that the constant pressure source mould
Block includes pwm control circuit and flyback transformer, and the pwm control circuit controls flyback transformation according to the standby signal received
Device exports corresponding constant voltage to mainboard.
4. the driving power supply of connection in series-parallel LED light bar network according to claim 2, it is characterised in that the driver element
Including LLC resonance bridge, LLC transformers and balancer, alternately exported successively just in first half cycle and later half cycle by LLC transformers
To supply current and reverse power supply electric current, exported after balancer partial pressure to rectification unit, by constant-current control unit according to described
Voltage signal controls the working frequency of LLC resonance bridges, the size of the supply current of LLC transformers output is remained constant.
5. the driving power supply of connection in series-parallel LED light bar network according to claim 4, it is characterised in that the constant-current source mould
Block also includes isolating transformer, and the drive signal that the isolating transformer is exported according to constant-current control unit drives LLC resonance bridges
Work.
6. the driving power supply of connection in series-parallel LED light bar network according to claim 4, it is characterised in that the LLC resonance bridge
Including the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance and the first electric capacity, the balancer includes the second electric capacity；First metal-oxide-semiconductor
First output end of drain electrode connection pfc circuit, the grid of first metal-oxide-semiconductor connects the 5th pin of isolating transformer, described first
The source electrode of metal-oxide-semiconductor connects the 1st pin of the 4th pin, the drain electrode of the second metal-oxide-semiconductor and the LLC transformers of isolating transformer；Described second
The grid of metal-oxide-semiconductor connects the 1st pin of isolating transformer, and the source electrode of second metal-oxide-semiconductor connects the 2nd pin and ground of LLC transformers；
One end of first electric capacity passes through the 2nd pin of inductance connection LLC transformers, the other end ground connection of first electric capacity；It is described
3rd pin of LLC transformers connects the 1st end of rectification unit, the 4th pin connection rectification list of the LLC transformers by balancer
2nd end of member.
7. the driving power supply of connection in series-parallel LED light bar network according to claim 2, it is characterised in that the detection unit
Including first resistor and second resistance, every group of LED light bar group includes the first lamp bar unit and the second lamp bar unit, first electricity
One end of resistance connects the negative pole of all first lamp bar units and one end of second resistance, the other end connection institute of the first resistor
There is the positive pole of the second lamp bar unit；The other end connection constant-current control unit of the second resistance.
8. the driving power supply of connection in series-parallel LED light bar network according to claim 4, it is characterised in that the rectification unit
Including the first diode, the second diode, the 3rd diode and the 4th diode；The LED light bar group includes Part I lamp
Bar group and Part II lamp bar group；The positive pole of first diode connects the negative pole of the second diode, also connected by balancer
The 3rd pin of the LLC transformers is connect, the negative pole of first diode connects the positive pole of the Part I lamp bar group；It is described
The positive pole of second diode connects the negative pole of the Part II lamp bar group；The positive pole of 3rd diode connects the LLC
The 4th pin and the negative pole of the 4th diode of transformer, the negative pole of the 3rd diode connect the Part II lamp bar group
Positive pole；The positive pole of 4th diode connects the negative pole of the Part I lamp bar group.
9. the driving power supply of connection in series-parallel LED light bar network according to claim 5, it is characterised in that the current constant control
Unit includes current constant control chip, and the STB ends of the current constant control chip connect ENA signal ends, the current constant control chip
PWM_IN ends connect ADJ signal ends, and the IS ends of the current constant control chip connect the detection unit, the current constant control chip
N1 ends connect the 6th pin of isolating transformer, the N2 ends of the current constant control chip connect the 7th pin of isolating transformer.
10. a kind of television set, it is characterised in that including the connection in series-parallel LED light bar network as described in claim 1-9 any one
Driving power supply.
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| CN201710317914.4A CN106954315A (en) | 2017-05-08 | 2017-05-08 | The driving power supply and television set of a kind of connection in series-parallel LED light bar network |
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| CN201710317914.4A CN106954315A (en) | 2017-05-08 | 2017-05-08 | The driving power supply and television set of a kind of connection in series-parallel LED light bar network |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464533A (en) * | 2017-08-21 | 2017-12-12 | 深圳创维－Rgb电子有限公司 | A kind of constant-current drive circuit and television set |
| CN109246889A (en) * | 2018-09-26 | 2019-01-18 | 华域视觉科技(上海)有限公司 | The LED drive circuit and its driving method and storage medium of DC-DC and linear combination |
| CN110989750A (en) * | 2019-11-06 | 2020-04-10 | 深圳市易飞扬通信技术有限公司 | Driver control circuit applied to optical module |
| CN111314678A (en) * | 2018-12-12 | 2020-06-19 | 深圳光峰科技股份有限公司 | Power supply system |
| WO2020181830A1 (en) * | 2019-03-12 | 2020-09-17 | 青岛海信电器股份有限公司 | Display apparatus and power supply control method |
| CN112333889A (en) * | 2020-11-25 | 2021-02-05 | 深圳创维－Rgb电子有限公司 | Double-direct-drive LED power circuit and television |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203301611U (en) * | 2013-06-06 | 2013-11-20 | 深圳Tcl新技术有限公司 | Direct-current switching circuit and switching power source |
| CN203537248U (en) * | 2013-11-14 | 2014-04-09 | 航天长峰朝阳电源有限公司 | Wide-input AC/DC power supply converter provided with PFC function |
| CN203872267U (en) * | 2014-05-16 | 2014-10-08 | 江苏利通电子有限公司 | LED TV power supply backlight driving circuit |
| CN106304492A (en) * | 2016-08-30 | 2017-01-04 | 康佳集团股份有限公司 | A kind of two-way constant-current circuit and supply unit |
| CN106409220A (en) * | 2016-09-29 | 2017-02-15 | 深圳创维－Rgb电子有限公司 | OLED driving power supply device and OLED television |
| CN106488607A (en) * | 2016-09-09 | 2017-03-08 | 深圳创维－Rgb电子有限公司 | Switching Power Supply and television set |
-
2017
- 2017-05-08 CN CN201710317914.4A patent/CN106954315A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203301611U (en) * | 2013-06-06 | 2013-11-20 | 深圳Tcl新技术有限公司 | Direct-current switching circuit and switching power source |
| CN203537248U (en) * | 2013-11-14 | 2014-04-09 | 航天长峰朝阳电源有限公司 | Wide-input AC/DC power supply converter provided with PFC function |
| CN203872267U (en) * | 2014-05-16 | 2014-10-08 | 江苏利通电子有限公司 | LED TV power supply backlight driving circuit |
| CN106304492A (en) * | 2016-08-30 | 2017-01-04 | 康佳集团股份有限公司 | A kind of two-way constant-current circuit and supply unit |
| CN106488607A (en) * | 2016-09-09 | 2017-03-08 | 深圳创维－Rgb电子有限公司 | Switching Power Supply and television set |
| CN106409220A (en) * | 2016-09-29 | 2017-02-15 | 深圳创维－Rgb电子有限公司 | OLED driving power supply device and OLED television |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107464533A (en) * | 2017-08-21 | 2017-12-12 | 深圳创维－Rgb电子有限公司 | A kind of constant-current drive circuit and television set |
| CN107464533B (en) * | 2017-08-21 | 2019-10-11 | 深圳创维－Rgb电子有限公司 | A kind of constant-current drive circuit and television set |
| CN109246889A (en) * | 2018-09-26 | 2019-01-18 | 华域视觉科技(上海)有限公司 | The LED drive circuit and its driving method and storage medium of DC-DC and linear combination |
| CN109246889B (en) * | 2018-09-26 | 2024-03-05 | 华域视觉科技(上海)有限公司 | DC-DC and linear combination LED driving circuit, driving method thereof and storage medium |
| CN111314678A (en) * | 2018-12-12 | 2020-06-19 | 深圳光峰科技股份有限公司 | Power supply system |
| WO2020181830A1 (en) * | 2019-03-12 | 2020-09-17 | 青岛海信电器股份有限公司 | Display apparatus and power supply control method |
| CN110989750A (en) * | 2019-11-06 | 2020-04-10 | 深圳市易飞扬通信技术有限公司 | Driver control circuit applied to optical module |
| CN110989750B (en) * | 2019-11-06 | 2021-09-14 | 深圳市易飞扬通信技术有限公司 | Driver control circuit applied to optical module |
| CN112333889A (en) * | 2020-11-25 | 2021-02-05 | 深圳创维－Rgb电子有限公司 | Double-direct-drive LED power circuit and television |
| CN117040289A (en) * | 2023-10-09 | 2023-11-10 | 广东欧曼科技股份有限公司 | High-efficiency LLC resonant power supply front-stage constant current system and control method |
| CN117040289B (en) * | 2023-10-09 | 2024-02-13 | 广东欧曼科技股份有限公司 | High-efficiency LLC resonant power supply front-stage constant current system and control method |
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Application publication date: 20170714 |