CN205793541U - Multi-channel LED lamp current-sharing driving means and back lighting device - Google Patents
Multi-channel LED lamp current-sharing driving means and back lighting device Download PDFInfo
- Publication number
- CN205793541U CN205793541U CN201620667575.3U CN201620667575U CN205793541U CN 205793541 U CN205793541 U CN 205793541U CN 201620667575 U CN201620667575 U CN 201620667575U CN 205793541 U CN205793541 U CN 205793541U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- led load
- driving means
- lamp current
- rectifier cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a kind of multi-channel LED lamp current-sharing driving means and back lighting device, this multi-channel LED lamp current-sharing driving means includes reverse exciting switching voltage regulator, reverse exciting switching voltage regulator includes the first secondary windings and second subprime winding, and the first end of the first secondary windings is connected to ground through the first rectifier cell, the first LED load successively；Second end of the first secondary windings is connected with the first end of second subprime winding through the second LED load, the second rectifier cell successively；Second end ground connection of second subprime winding；Second end of the first secondary windings and the second end Same Name of Ends each other of second subprime winding.This utility model achieves the purpose to multi-channel LED load current-sharing, and, it is to avoid the problem that single channel load driving voltage is too high, circuit safety is higher.
Description
Technical field
This utility model relates to back lighting device technical field, particularly relate to a kind of multi-channel LED lamp current-sharing driving means and
Back lighting device.
Background technology
LED light source has been widely used in non-active light-emitting display device.As back lighting, need high-precision current-sharing
Drive with the requirement meeting the brightness of display device, colourity and uniformity.
It is for prior art using inverse-excitation type switch power-supply drive the electrical block diagram of LED with reference to Fig. 1, Fig. 1.
As it is shown in figure 1, in prior art, the secondary windings of reverse exciting switching voltage regulator arranges multiple LED load being one another in series, passes through
Reverse exciting switching voltage regulator exports suitable DC voltage and directly drives LED load, it is achieved the current-sharing between each LED load, but should
Circuit can only do single channel and drive, and the driving voltage absolute value of each LED load is higher, it is impossible to ensure the safety of circuit.
Utility model content
Main purpose of the present utility model is to provide a kind of multi-channel LED lamp current-sharing driving means, it is intended to realize manifold
The current-sharing of road LED load circuit, avoids the problem that on single channel, LED load driving voltage is too high simultaneously, improves the safety of circuit
Property.
For achieving the above object, this utility model provides a kind of multi-channel LED lamp current-sharing driving means, switchs including flyback
Power supply, described reverse exciting switching voltage regulator includes the first secondary windings and second subprime winding, the first end of described first secondary windings
It is connected to ground through the first rectifier cell, the first LED load successively；Second end of described first secondary windings is successively through the 2nd LED
Load, the second rectifier cell are connected with the first end of described second subprime winding；Second end ground connection of described second subprime winding；
Second end of described first secondary windings and the second end Same Name of Ends each other of described second subprime winding.
Preferably, described multi-channel LED lamp current-sharing driving means also includes the first electric capacity and the second electric capacity, described first electricity
The first end held is connected with the common port of described second rectifier cell and the first LED load, the second termination of described first electric capacity
Ground；First end of described second electric capacity is mutual with the cathode terminal of the second end of described first secondary windings and described second LED load
Connecing, the common port between the second end of described second electric capacity with described first rectifier cell and the first LED load is connected.
Preferably, the second end of described first secondary windings is successively through the second rectifier cell, the second LED load, the 3rd LED
Load, the 3rd rectifier cell are connected with the first end of described second subprime winding；Second end of described second subprime winding is successively
It is connected to ground through the 4th rectifier cell, the 4th LED load.
Preferably, described multi-channel LED lamp current-sharing driving means also includes the first electric capacity and the second electric capacity, described first electricity
The first end held is connected with the common port between described first rectifier cell and described first LED load, described first electric capacity
Common port between second end with described second rectifier cell and described second LED load is connected；The first of described second electric capacity
End is connected with the common port between described 3rd rectifier cell and described 3rd LED load, the second end of described second electric capacity and
Common port between described 4th rectifier cell and described 4th LED load connects.
Preferably, described multi-channel LED lamp current-sharing driving means also includes third time level winding and the 3rd electric capacity, described the
First end of three secondary windings connects with the second end of described first secondary windings through the 3rd rectifier cell, the 3rd LED load successively
Connect；Second end of described third time level winding is connected with the cathode terminal of described second LED load；First end of described 3rd electric capacity
It is connected with the second end of described first secondary windings, the second end of described 3rd electric capacity and the 3rd rectifier cell and the described 3rd
Common port between LED load connects.
Preferably, described reverse exciting switching voltage regulator also includes having described first secondary windings and the transformation of second subprime winding
Device, the driving switch driving described transformator and the flyback controller being connected with described driving switch, described transformator also has
Armature winding, the power input that the first end is described reverse exciting switching voltage regulator of described armature winding, the of described armature winding
Two ends are connected with the described input driving switch, and the control end of the described controlled end driving switch and described flyback controller is even
Connect, the described output head grounding driving switch.
Preferably, described reverse exciting switching voltage regulator also includes that feedback module, described feedback module include being connected to described first
Sampling resistor between LED load and ground, the outfan of described feedback module connects with the feedback reception end of described flyback controller
Connect.
Preferably, described feedback module also includes error amplifier and optocoupler, the input of described error amplifier and institute
The common port stating sampling resistor and described first LED load connects, and the outfan of described error amplifier is defeated with described optocoupler
Entering end to connect, the outfan of described optocoupler is the outfan of described feedback module.
Preferably, described reverse exciting switching voltage regulator also includes that absorbing circuit, described absorbing circuit include the 3rd electric capacity, the first electricity
Resistance and the first diode, described absorbing circuit includes the 3rd electric capacity, the first resistance and the first diode, the of described 3rd electric capacity
First end interconnection of one end, the first end of described first resistance and described primary winding, the second of described 3rd electric capacity
End, the negative electrode interconnection of the second end of described first resistance and described first diode, the anode of described first diode, described in open
Close input and the interconnection of described armature winding the second end of element.
This utility model also provides for a kind of back lighting device, including multi-channel LED lamp current-sharing driving means as above, institute
State multi-channel LED lamp current-sharing driving means include reverse exciting switching voltage regulator, described reverse exciting switching voltage regulator include the first secondary windings and
Second subprime winding, the first end of described first secondary windings is connected to ground through the first rectifier cell, the first LED load successively；
Second end of described first secondary windings successively through the second LED load, the of the second rectifier cell and described second subprime winding
One end connects；Second end ground connection of described second subprime winding；Second end of described first secondary windings and described second subprime
The second end Same Name of Ends each other of winding.
This utility model by by multiple LED load by corresponding rectifier cell and transformator the first secondary windings and the
Secondary stage windings in series is on the same circuit, so that the electric current flowing through each LED load is the most equal, it is achieved thereby that to many
The purpose of channel LED load current-sharing；Further, use multi-channel LED load drive mode, substitute existing single channel model,
In the case of LED load quantity is equal, the driving voltage of each LED load of multi-channel mode is reduced to two points of single channel model
One of, so, turn avoid the too high and unsafe problem of driving voltage of LED load, improve the safety of circuit.
Accompanying drawing explanation
Fig. 1 is for using inverse-excitation type switch power-supply to drive the electrical block diagram of LED in prior art；
Fig. 2 is the electrical block diagram of this utility model multi-channel LED lamp current-sharing driving means first embodiment；
Fig. 3 is the electrical block diagram of this utility model multi-channel LED lamp current-sharing driving means the second embodiment；
Fig. 4 is the electrical block diagram of this utility model multi-channel LED lamp current-sharing driving means the 3rd embodiment.
Drawing reference numeral illustrates:
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model rather than all
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, broadly falls into the scope of this utility model protection.
It is to be appreciated that directional instruction (such as up, down, left, right, before and after ...) in this utility model embodiment
It is only used for explanation relative position relation under a certain particular pose (as shown in drawings) between each parts, motion conditions etc., as
When really this particular pose changes, then directionality instruction changes the most therewith.
It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose, and it is not understood that
For indicating or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ",
The feature of " second " can express or implicitly include at least one this feature.It addition, the technical side between each embodiment
Case can be combined with each other, but must be based on those of ordinary skill in the art are capable of, when the combination of technical scheme
Occur conflicting will be understood that the combination of this technical scheme does not exists, the most not in this utility model requirement when maybe cannot realize
Protection domain within.
This utility model provides a kind of multi-channel LED lamp current-sharing driving means.
With reference to Fig. 2, in the first embodiment, this utility model multi-channel LED lamp current-sharing driving means includes that flyback switchs
Power supply 10, this reverse exciting switching voltage regulator 10 includes transformator TS1, the driving switch 11 driving described transformator TS1 and drives with described
The flyback controllers 12 of dynamic switch 11 connection, transformator TS1 have armature winding N1, the first secondary windings N2 and second subprime around
Group N3, first end of described armature winding N1 is the power input of described reverse exciting switching voltage regulator 10, the second of armature winding N1
Hold and be connected with the described input driving switch 11, the described control that controlled end is described reverse exciting switching voltage regulator 10 driving switch 11
Signal input part processed, the output head grounding of described driving switch 11；Described armature winding N1 and the first end and described first time
Second end of level winding N2 and the second end Same Name of Ends each other of described second subprime winding N3.
In the present embodiment, first end of described first secondary windings N2 is negative through the first rectifier cell DS1, a LED successively
Carry LB1 and be connected to ground；Second end of described first secondary windings N2 is successively through the second LED load LB2, the second rectifier cell DS2
It is connected with first end of described second subprime winding N3；The second end ground connection of described second subprime winding N3.
When flyback controller 12 exports pwm control signal control driving switch 11 conducting, the armature winding of transformator TS1
N1 energy storage, the first secondary windings N2 and second subprime winding N3 are without output, and now, LED load LB1, LB2 electric current are zero, not work
Make.
When flyback controller 12 exports pwm control signal control driving switch 11 shutoff, the armature winding of transformator TS1
N1 discharges, and the first secondary windings N2 and second subprime winding N3 receive the power supply of armature winding N1 and through its rectifier cell accordingly
Export after DS1, DS2 rectification, it is provided that to LED load LB1, LB2, to drive LED load LB1, LB2 to light.
It is understood that due to each LED load LB1, LB2 by rectifier cell DS1, DS2 and transformator TS1 the
One secondary windings N2 and second subprime winding N3 is connected on the same circuit, so so that flow through the electric current of each LED load all
Equal, it is achieved thereby that the purpose to multi-channel LED load current-sharing；Further, use multi-channel LED load drive mode, substitute
Existing single channel model, in the case of LED load quantity is equal, the driving voltage fall of each LED load of multi-channel mode
Low for 1/2nd of single channel model, so, turn avoid the too high and unsafe problem of driving voltage of LED load.
In the present embodiment, reverse exciting switching voltage regulator 10 can also be other forms, does not limit.
In the present embodiment, each paths of LEDs load LB1, LB2 may each be and be composed in series by multiple LED, particular number
Do not limit.
In the present embodiment, rectifier cell DS1, DS2 are preferably commutation diode, and rectifier cell DS1, DS2 are for will be through
After the alternating current power supply of transformator TS1 output is transformed into DC source, output is to LED load energy supply.
In the various embodiments described above, driving switch 11 to preferably employ metal-oxide-semiconductor, the grid of metal-oxide-semiconductor is controlled end, the leakage of metal-oxide-semiconductor
Extremely input, the source electrode of metal-oxide-semiconductor is outfan, and metal-oxide-semiconductor preferably operate in continuous conduction mode (namely CCM pattern) or
It is operated in discontinuous conduction mode (namely DCM pattern).
In the present embodiment, the secondary of transformator TS1 also can increase multiple winding further, negative to realize more LED
Carrying and drive, the embodiment specifically referring to armature winding N1 and the first secondary windings N2 and second subprime winding N3 realizes, herein
Repeat no more.Additionally, the primary at transformator TS1 can also increase an auxiliary winding, close in order to provide to flyback controller
Suitable DC source, to save single power supply circuits.
Based on first embodiment, with continued reference to Fig. 2, in further carrying out example, described multi-channel LED lamp current-sharing drives
Device also includes the first electric capacity C1 and the second electric capacity C2, first end of described first electric capacity C1 and the second rectifier cell DS2 and
The common port of one LED load connects, the second end ground connection of described first electric capacity C1；First end of described second electric capacity C2 is with described
Second end of the first secondary windings N2 and the cathode terminal mutual connection of the second LED load, second end and first of described second electric capacity C2
Common port between rectifier cell DS1 and the first LED load connects.Wherein, the first electric capacity C1 and the second electric capacity C2 is for whole
DC source after stream is filtered processing.
With reference to Fig. 3, proposing this utility model the second embodiment, this second embodiment realizes based on first embodiment, specifically
Ground, in a second embodiment, the second end of described first secondary windings successively through the second rectifier cell, the second LED load, the 3rd
LED load, the 3rd rectifier cell are connected with the first end of described second subprime winding；Second end of described second subprime winding depends on
Secondary it is connected to ground through the 4th rectifier cell, the 4th LED load.
It is understood that in this second embodiment, two secondary windings achieve four groups of LED load and drive,
In the case of LED load quantity is equal, compared with existing single channel model, the driving voltage of each LED load is reduced to single-pass
/ 4th of road pattern, so, avoid the too high and unsafe problem of driving voltage of LED load significantly.
With further reference to Fig. 3, in this second embodiment, described multi-channel LED lamp current-sharing driving means still further comprises
First electric capacity C1 and the second electric capacity C2, first end of described first electric capacity C1 and described first rectifier cell DS1 and described first
Common port between LED load LB1 connects, second end of described first electric capacity C1 and described second rectifier cell DS2 and described
Common port between second LED load LB2 connects；First end of described second electric capacity C2 and described 3rd rectifier cell DS3 and
Common port between described 3rd LED load LB3 connects, second end of described second electric capacity C2 and described 4th rectifier cell
Common port between DS4 and described 4th LED load LB4 connects.Wherein, the first electric capacity C1 and the second electric capacity C2 is for rectification
After DC source be filtered process.
With reference to Fig. 4, proposing this utility model the 3rd embodiment, the 3rd embodiment realizes based on first embodiment, specifically
Ground, in the third embodiment, described multi-channel LED lamp current-sharing driving means also includes third time level winding N4 and the 3rd electric capacity
C3, first end of described third time level winding N4 is successively through the 3rd rectifier cell DS3, the 3rd LED load LB3 and described first time
Second end of level winding N2 connects；Described second end of third time level winding N4 is connected with the cathode terminal of described second LED load；
First end of described 3rd electric capacity C3 is connected with second end of described first secondary windings N2；Second end of described 3rd electric capacity C3
It is connected with the common port between the 3rd rectifier cell DS3 and the 3rd LED load.3rd electric capacity C is filter capacitor.
In 3rd embodiment, three secondary windings achieve three groups of LED load and drives, in LED load quantity phase
In the case of Deng, compared with existing single channel model, the driving voltage of each LED load be reduced to single channel model three/
One, so, avoid the too high and unsafe problem of driving voltage of LED load significantly.
Based on above-described embodiment, with reference to Fig. 2, described reverse exciting switching voltage regulator 10 further comprises feedback module 13, institute
State the sampling resistor RS1 that feedback module 13 includes being connected between described first LED load LB1 and ground, described feedback module 13
Outfan be connected with the feedback reception end of described flyback controller 12.Specifically, feedback module 13 will flow through the electricity of LED load
Stream signal exports the feedback reception end to flyback controller 12, so that flyback controller 12 control and regulation drive switch 11
Dutycycle, and then control the size of transformator TS1 output electric current, with the current constant of stability contorting transformator TS1 output, and then
Ensure that the electric current in LED load is a steady state value.
In this embodiment, feedback module 13 still further comprises optocoupler 131 and error amplifier 132, and described error is amplified
The input of device 132 is connected with the common port of described sampling resistor RS1 and described first LED load LB1, described error amplifier
The outfan of 132 is connected with the input of described optocoupler, and the outfan of described optocoupler is the outfan of described feedback module 13.
When the current signal of LED load flows through sampling resistor RS1, will produce a voltage drop VRS, this voltage VRS with
The electric current flowing through sampling resistor RS1 is directly proportional, and voltage VRS exports to optocoupler 131, by light after error amplifier 132 amplifies
The feedback reception end to flyback controller 12 is transmitted in coupling 131 isolation, thus realizes the monitoring to LED load electric current.
Based on above-described embodiment, with reference to Fig. 2, in a further embodiment, described multi-channel LED lamp current-sharing driving means
Also include that absorbing circuit 14, described absorbing circuit 14 include Absorption Capacitance CD, the first resistance R1 and the first diode D1, described suction
Receive first end of first end of electric capacity CD and first end of described first resistance R1 and described transformator TS1 armature winding N1 even
Connecing, the negative electrode of second end of described Absorption Capacitance CD and second end of described first resistance R1 and described first diode D1 is even
Connecing, the anode of described first diode D1 switchs the input of 11 and the second end of described first primary coil with described driving
Common port connects.
Owing to transformator TS1 is a coupling inductance not ideal component, so there is leakage inductance, at reverse exciting switching voltage regulator 10
In also can there is stray inductance, when described drive switch 11 shutoff time, the energy in leakage inductance and stray inductance can drive switch
11 produce the highest due to voltage spikes, thus can cause the damage of device.In the present embodiment, absorbing circuit 14 is set and absorbs transformator
After the leakage inductance energy that TS1 produces, then it is avoided that device failure.Specifically, the Absorption Capacitance CD in absorbing circuit 14 is used for keeping in
Leakage inductance energy；First resistance R1 is used for consuming leakage inductance energy；First diode D1, for when driving switch 11 disconnection, will drive
The voltage of switch 11 carries out clamper, and in other preferred embodiments, described absorbing circuit 14 also can use other absorbing circuits to replace
In generation, realizes, such as RC absorbing circuit.
In order to of the present utility model thought is better described, in conjunction with above-mentioned all embodiments, and combine Fig. 2 and Fig. 3 to this
The physical circuit principle of utility model preferred embodiment is described in detail:
Such as Fig. 2 and Fig. 3, when flyback controller 12 exports pwm control signal control driving switch 11 conducting, transformator
TS1 armature winding N1 starts energy storage, and the second end and second subprime winding N3 second end of transformator TS1 the first secondary windings N2 are
Positive potential, first end of the first secondary windings N2 of transformator TS1 and first end of second subprime winding N3 are nagative potential, first
Rectifier cell DS1, the second rectifier cell DS2, the 3rd rectifier cell DS3 and the 4th rectifier cell DS4 all end, and do not produce back
Road electric current, now, the first secondary windings N2 and second subprime winding N3 of transformator TS1 does not provides power output to LED load.
When flyback controller 12 exports pwm control signal control driving switch 11 shutoff, the armature winding of transformator TS1
N1 discharges to the first secondary windings N2 and second subprime winding N3 of transformator TS1, the of transformator TS1 the first secondary windings N2
Two ends and second subprime winding N3 the second end are nagative potential, first end of the first secondary windings N2 of transformator TS1 and second time
First end of level winding N3 is positive potential, the first rectifier cell DS1, the second rectifier cell DS2, the 3rd rectifier cell DS3 and the
Four rectifier cell DS4 all turn on, and give the first electric capacity C1 and the second electric capacity C2 charging, light simultaneously the first LED load LB1,
Second LED load LB2, the 3rd LED load LB3 and described 4th LED load LB4.
Meanwhile, load current signal is synchronized on sampling resistor RS1, through error amplifier 132 amplify after export to
Optocoupler 131 realizes the one-way transmission of current signal, and export after realizing input and the isolation exported to flyback controller 12 anti-
Feedback receiving terminal, thus realize the monitoring to LED load electric current, flyback controller 12 controls to adjust the dutycycle of metal-oxide-semiconductor, and then control
The size of transformator TS1 processed output electric current, with the electric current of stability contorting LED load, thus realizes the electric current of transformator TS1 output
It is a steady state value, it is ensured that flow through the current constant of LED load.
It is understood that due to the first LED load LB1, the second LED load LB2, the 3rd LED load LB3 and the 4th
LED load LB4 is by the first secondary windings N2 and second of corresponding rectifier cell DS1, DS2, DS3, DS4 with transformator TS1
Secondary windings N3 is connected on the same circuit, so that the electric current flowing through each LED load is the most equal, it is achieved thereby that to many
The purpose of channel LED load current-sharing.Further, in the case of LED load quantity is equal, multi-channel LED load is used to drive mould
Formula is compared with existing single channel model, and the driving voltage of each LED load of multi-channel mode is only each LED of single channel model
/ 4th of the driving voltage of load, so, turn avoid the too high and unsafe problem of driving voltage of LED load.
This utility model also provides for a kind of back lighting device, it is to be understood that due to standby at this utility model back lighting device
In employ above-mentioned multi-channel LED lamp current-sharing driving means, therefore, the embodiment of this back lighting device includes above-mentioned multi-channel LED
Whole technical schemes of the whole embodiment of lamp current-sharing driving means, and the technique effect reached is the most identical, at this no longer
Repeat.
These are only preferred embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, every
Utilize equivalent structure or equivalence flow process conversion that this utility model description and accompanying drawing content made, or be directly or indirectly used in
Other relevant technical fields, are the most in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a multi-channel LED lamp current-sharing driving means, it is characterised in that include reverse exciting switching voltage regulator, described flyback switch electricity
Source includes the first secondary windings and second subprime winding, the first end of described first secondary windings successively through the first rectifier cell,
First LED load is connected to ground；Second end of described first secondary windings successively through the second LED load, the second rectifier cell with
First end of described second subprime winding connects；Second end ground connection of described second subprime winding；Described first secondary windings
Second end and the second end Same Name of Ends each other of described second subprime winding.
2. multi-channel LED lamp current-sharing driving means as claimed in claim 1, it is characterised in that described multi-channel LED lamp current-sharing
Driving means also includes the first electric capacity and the second electric capacity, the first end of described first electric capacity and described second rectifier cell and first
The common port of LED load connects, the second end ground connection of described first electric capacity；First end of described second electric capacity and described first time
Level the second end of winding and the cathode terminal mutual connection of described second LED load, the second end of described second electric capacity is first whole with described
Common port between fluid element and the first LED load connects.
3. multi-channel LED lamp current-sharing driving means as claimed in claim 1, it is characterised in that described first secondary windings
Second end successively through the second rectifier cell, the second LED load, the 3rd LED load, the 3rd rectifier cell and described second subprime around
First end of group connects；Second end of described second subprime winding is connected to through the 4th rectifier cell, the 4th LED load successively
Ground.
4. multi-channel LED lamp current-sharing driving means as claimed in claim 3, it is characterised in that described multi-channel LED lamp current-sharing
Driving means also includes the first electric capacity and the second electric capacity, the first end of described first electric capacity and described first rectifier cell and described
Common port between first LED load connects, the second end of described first electric capacity and described second rectifier cell and described second
Common port between LED load connects；First end of described second electric capacity is born with described 3rd rectifier cell and described 3rd LED
Common port between load connects, the second end of described second electric capacity and described 4th rectifier cell and described 4th LED load it
Between common port connect.
5. multi-channel LED lamp current-sharing driving means as claimed in claim 1, it is characterised in that described multi-channel LED lamp current-sharing
Driving means also includes third time level winding and the 3rd electric capacity, and the first end of described third time level winding is successively through the 3rd rectification unit
Part, the 3rd LED load are connected with the second end of described first secondary windings；Second end of described third time level winding and described the
The cathode terminal of two LED load connects；First end of described 3rd electric capacity is connected with the second end of described first secondary windings, described
Common port between second end and the 3rd rectifier cell and described 3rd LED load of the 3rd electric capacity connects.
6. the multi-channel LED lamp current-sharing driving means as described in any one of claim 1 to 5, it is characterised in that described flyback is opened
Close power supply and also include there is described first secondary windings and the transformator of second subprime winding, drive the driving of described transformator to open
Closing and drive the flyback controller that is connected of switch with described, described transformator also has armature winding, the of described armature winding
One end is the power input of described reverse exciting switching voltage regulator, the second end of described armature winding and the described input driving switch
Connecting, the described controlled end driving switch is connected with the control end of described flyback controller, the described output termination driving switch
Ground.
7. multi-channel LED lamp current-sharing driving means as claimed in claim 6, it is characterised in that described reverse exciting switching voltage regulator is also
Including feedback module, described feedback module includes the sampling resistor being connected between described first LED load and ground, described feedback
The outfan of module is connected with the feedback reception end of described flyback controller.
8. multi-channel LED lamp current-sharing driving means as claimed in claim 7, it is characterised in that described feedback module also includes
Error amplifier and optocoupler, the input of described error amplifier and described sampling resistor and described first LED load public
End connect, the outfan of described error amplifier is connected with the input of described optocoupler, the outfan of described optocoupler be described instead
The outfan of feedback module.
9. multi-channel LED lamp current-sharing driving means as claimed in claim 6, it is characterised in that described reverse exciting switching voltage regulator is also
Including absorbing circuit, described absorbing circuit includes the 3rd electric capacity, the first resistance and the first diode, the first of described 3rd electric capacity
End, the first end interconnection of the first end of described first resistance and described primary winding, the second end of described 3rd electric capacity,
Second end of described first resistance and the negative electrode interconnection of described first diode, the anode of described first diode, described switch
The input of element and the interconnection of described armature winding the second end.
10. a back lighting device, it is characterised in that include that the multi-channel LED lamp as described in claim 1 to 9 any one is equal
Stream driving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620667575.3U CN205793541U (en) | 2016-06-29 | 2016-06-29 | Multi-channel LED lamp current-sharing driving means and back lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620667575.3U CN205793541U (en) | 2016-06-29 | 2016-06-29 | Multi-channel LED lamp current-sharing driving means and back lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205793541U true CN205793541U (en) | 2016-12-07 |
Family
ID=58127886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620667575.3U Active CN205793541U (en) | 2016-06-29 | 2016-06-29 | Multi-channel LED lamp current-sharing driving means and back lighting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205793541U (en) |
-
2016
- 2016-06-29 CN CN201620667575.3U patent/CN205793541U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102437744B (en) | Self current-balancing power supply circuit with multiplexed output | |
| US20120274291A1 (en) | Multi-path constant current driving circuit | |
| CN103312178B (en) | A kind of two-way DC/DC changer and apply its battery detection equipment | |
| CN106304492B (en) | double-circuit constant current circuit and power supply device | |
| CN101916548A (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN109889048A (en) | A kind of isolation bidirectional DC-DC converter | |
| CN205491350U (en) | Four ways LED lamp drive arrangement that flow equalizes | |
| CN104242699A (en) | AC input multiplexed isolation low-power output power source | |
| CN103944420B (en) | Power system and its control method | |
| CN103647448A (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN103856079A (en) | Switching power-conversion circuit and power supply device for the same | |
| CN205753994U (en) | Multiple-output electric power and electronic equipment | |
| CN205946261U (en) | Multichannel LED flow equalize drive arrangement and backlight device | |
| CN202750021U (en) | Converter for converting alternating current into direct current | |
| CN204538988U (en) | A kind of Switching Power Supply, frequency-variable controller and convertible frequency air-conditioner | |
| CN202178715U (en) | AC-DC power conversion chip and power conversion circuit | |
| CN205792257U (en) | Backlight drive circuit and television set | |
| CN205793541U (en) | Multi-channel LED lamp current-sharing driving means and back lighting device | |
| CN206948663U (en) | A kind of multiple-channel output constant current driver circuit for LED | |
| CN201383895Y (en) | Power source supply device | |
| CN209516948U (en) | A kind of isolation bidirectional DC-DC converter | |
| CN204119073U (en) | A kind of input multichannel that exchanges isolates low-power out-put supply | |
| CN209105035U (en) | DC-DC step-down isolation circuit | |
| CN203827210U (en) | Wide-voltage-input-type large-power intrinsically-safe power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |