CN205596216U - Switching power supply and TV set - Google Patents
Switching power supply and TV set Download PDFInfo
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- CN205596216U CN205596216U CN201521035725.0U CN201521035725U CN205596216U CN 205596216 U CN205596216 U CN 205596216U CN 201521035725 U CN201521035725 U CN 201521035725U CN 205596216 U CN205596216 U CN 205596216U
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Abstract
The utility model discloses a switching power supply and TV set, wherein, switching power supply includes power module, first vary voltage output module, control module and feedback module, power module's output is connected with first vary voltage output module's input, and first vary voltage output module's output and LED load are connected, and first vary voltage output module's controlled end and control module's control end are connected, and control module's feedback end is connected with feedback module's output, and feedback module's signal acquisition end and LED load are connected, corresponding control signal to the first vary voltage output module of work current output of the LED load that control module provided according to feedback module to make the electric current of the invariable size of first vary voltage output module output. The utility model has the characteristics of power conversion efficiency is high.
Description
Technical field
This utility model relates to technical field of television sets, particularly to a kind of Switching Power Supply and television set.
Background technology
In traditional television set, its Switching Power Supply mainly include power module, the first transformation output module,
Boost module and current-sharing module.Its operation principle is, power module is exported by the first transformation output module
DC voltage exports after carrying out a transformation and powers to the mainboard of television set, movement and backlight portion.Its
In, for the power supply of backlight portion, it is by the electricity after the first transformation output module transformation by boost module
Source voltage provides after carrying out secondary booster, by current-sharing module, backlight portion is carried out current constant control simultaneously,
Ensure that backlight portion normally works.
Although from the foregoing, existing Switching Power Supply can meet mainboard, movement and back light part
Divide and be powered, but for backlight portion, owing to processing through twice transformation, cause the electricity of this circuit
Source conversion efficiency is relatively low.
Utility model content
Main purpose of the present utility model is to provide a kind of Switching Power Supply, it is intended to improve the electricity of this Switching Power Supply
Source conversion efficiency.
For achieving the above object, the Switching Power Supply that the utility model proposes, including power module, the first change
Pressure output module, control module and feedback module；The outfan of described power module and described first transformation
The input of output module connects, and the outfan of described first transformation output module is connected with LED load,
The described controlled end of the first transformation output module is connected with the control end of described control module, described control mould
The feedback end of block is connected with the outfan of described feedback module, the signals collecting end of described feedback module and institute
State LED load to connect；Wherein, described power module is for providing straight to described first transformation output module
Stream power supply；Described first transformation output module is for providing running voltage to described LED load；Institute
State control module for driving described first transformation output module work, and feed back according to described feedback module
Described LED load operating current export corresponding control signal adjust described first transformation output module
Output electric current so that described loaded work piece current constant.
Preferably, described first transformation output module includes the first switching tube, second switch pipe, the first change
Depressor, the first electric capacity, rectification unit；The drain electrode of described first switching tube is described first transformation output mould
The input of block, the grid of described first switching tube is the first controlled end of described first transformation output module,
The source electrode of described first switching tube respectively with the drain electrode of described second switch pipe, described first transformator former
One end of limit winding connects, and the grid of described second switch pipe is the second of described first transformation output module
Controlled end, the source ground of described second switch pipe；The other end of the primary side winding of described first transformator
Through described first capacity earth, the first end of the secondary windings of described first transformator and described rectification unit
First input end connect, the second end ground connection of the secondary windings of described first transformator, described first become
3rd end of the secondary windings of depressor is connected with the second input of described rectification unit；Described rectification unit
The outfan that outfan is described first transformation output module.
Preferably, described rectification unit includes the second electric capacity, the first diode and the second diode, described
One end of second electric capacity is the first input end of described rectification unit, the other end of described second electric capacity and institute
The anode stating the first diode connects, the negative electrode of described first diode and the negative electrode of described second diode
Connect, described first diode and the output that link node is described rectification unit of described second diode
End, second input that anode is described rectification unit of described second diode.
Preferably, described filter unit includes the 3rd electric capacity and the 4th electric capacity；The anode of described 3rd electric capacity
Being connected with the anode of described 4th electric capacity, the negative electrode of described 3rd electric capacity and the negative electrode of described 4th electric capacity connect
Ground, described 3rd electric capacity and the outfan that link node is described filter unit of described 4th electric capacity.
Preferably, described control module includes control chip and the second transformator；Described control chip anti-
Feedback end is the feedback end of described control module, the first outfan of described control chip and described second transformation
One end of the primary side winding of device connects, the second outfan of described control chip and described second transformator
The other end of primary side winding connects；One end of first vice-side winding of described second transformator is described control
First control end of module, the other end of the second vice-side winding of described second transformator is opened with described first
The source electrode closing pipe connects, and one end of the second vice-side winding of described second transformator is described control module
Second controls end, the other end ground connection of the second vice-side winding of described second transformator.
Preferably, described power module includes rectifier bridge and PFC boost unit；The input of described rectifier bridge
For input ac power, the outfan of described rectifier bridge is connected with the input of described PFC boost unit,
The outfan that outfan is described power module of described PFC boost unit.
Preferably, described Switching Power Supply also includes the second transformation output module providing running voltage to movement,
The described input of the second transformation output module is connected with the outfan of described power module, and described second becomes
The outfan of die block is connected with described movement.
Preferably, described second transformation output module includes the 3rd transformator, PWM controller, the 3rd opens
Close pipe and secondary commutation filter circuit；One end of the primary side winding of described 3rd transformator is described second change
The input of pressure output module, the other end of the primary side winding of described 3rd transformator and described 3rd switch
The drain electrode of pipe connects；The grid of described 3rd switching tube is connected with described PWM controller, and the described 3rd opens
Close the source ground of pipe；The vice-side winding of described 3rd transformator is defeated with described secondary commutation filter circuit
Entering end to connect, the outfan of described secondary commutation filter circuit is the output of described second transformation output module
End.
This utility model also proposes a kind of television set, and described television set includes Switching Power Supply as above；
Wherein, described Switching Power Supply includes power module, the first transformation output module, control module and feedback mould
Block；The outfan of described power module is connected with the input of described first transformation output module, and described
The outfan of one transformation output module is connected with LED load, the controlled end of described first transformation output module
Being connected with the control end of described control module, the feedback end of described control module is defeated with described feedback module
Going out end to connect, the signals collecting end of described feedback module is connected with described LED load；Wherein, described control
The operating current output of the described LED load that molding tuber provides according to described feedback module controls letter accordingly
Number to described first transformation output module, so that the electricity of described first transformation output module output constant size
Stream.
The LED load that technical solutions of the utility model provide according to feedback module by using control module
Operating current output controls signal to the first transformation output module accordingly, so that the first transformation output module
The electric current of output constant size.Owing to this Switching Power Supply does not include boost module, the signal of telecommunication is at this switch electricity
In source, only need to carry out linear transformation just can realize constant current output.Accordingly, with respect to prior art, this reality
Have the advantages that power supply conversion efficiency is high by the Switching Power Supply of novel proposition.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Accompanying drawing in describing below is only embodiments more of the present utility model, for ordinary skill people
From the point of view of Yuan, on the premise of not paying creative work, it is also possible to obtain according to the structure shown in these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the high-level schematic functional block diagram of this utility model Switching Power Supply one embodiment；
Fig. 2 is the high-level schematic functional block diagram of this utility model another embodiment of Switching Power Supply；
Fig. 3 is the electrical block diagram of the another embodiment of this utility model Switching Power Supply.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 10 | Power module | Q1 | First switching tube |
| 20 | First transformation output module | Q2 | Second switch pipe |
| 30 | Control module | T1 | First transformator |
| 40 | Feedback module | T2 | Second transformator |
| 501 | PWM controller | C1 | First electric capacity |
| DGND | Digitally | C2 | Second electric capacity |
| 101 | Rectifier bridge | C3 | 3rd electric capacity |
| 102 | PFC boost unit | C4 | 4th electric capacity |
| U | Control chip | D1 | First diode |
| R1 | First resistance | D2 | Second diode |
| 50 | Second transformation output module | 502 | Secondary commutation filter circuit |
| T3 | 3rd transformator | Q3 | 3rd switching tube |
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings into
One step explanation.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment
Scheme is clearly and completely described, it is clear that described embodiment is only of the present utility model one
Section Example rather than whole embodiments.Based on the embodiment in this utility model, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise, broadly falls into
The scope of this utility model protection.
It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose,
And it is not intended that indicate or imply its relative importance or the implicit number indicating indicated technical characteristic
Amount.Thus, define " first ", the feature of " second " can be expressed or implicitly include at least one
Individual this feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with
Based on those of ordinary skill in the art are capable of, when conflicting or nothing occurs in the combination of technical scheme
Will be understood that when method realizes that the combination of this technical scheme does not exists, the guarantor not required at this utility model
Within the scope of protecting.
The utility model proposes a kind of Switching Power Supply.
Referring to figs. 1 through 3, Fig. 1 is the high-level schematic functional block diagram of this utility model Switching Power Supply one embodiment；Figure
2 is the high-level schematic functional block diagram of this utility model another embodiment of Switching Power Supply；Fig. 3 is that this utility model is opened
Close the electrical block diagram of the another embodiment of power supply.
As it is shown in figure 1, in this utility model embodiment, this Switching Power Supply include power module 10,
One transformation output module 20, control module 30 and feedback module 40；The outfan of described power module 10
It is connected with the input of described first transformation output module 20, described first transformation output module 20 defeated
Go out end to be connected with LED load, the controlled end of described first transformation output module 20 and described control module
The control end of 30 connects, and the feedback end of described control module 30 connects with the outfan of described feedback module 40
Connecing, the signals collecting end of described feedback module 40 is connected with described LED load；Wherein, described power supply
Module 10 is for providing DC power supply to described first transformation output module 20；Described first transformation
Output module 20 is for providing running voltage to described LED load；Described control module 30 is used for driving
Described first transformation output module 20 works, and bears according to the described LED of described feedback module 40 feedback
The operating current carried, exports corresponding control signal and adjusts the output electricity of described first transformation output module 20
Stream, so that described loaded work piece current constant.
When described Switching Power Supply starts, the outfan of described power module 10 exports the first voltage signal extremely
The input of described first transformation output module 20, described first transformation output module 20 is by described first
Voltage signal carries out conversion process and exports the second voltage signal to LED load at its outfan, described
LED load works, and the signals collecting end of described feedback module 30 obtains the work that described LED load is current
Making electric current, current described operating current is delivered to described control mould by the outfan of described feedback module 40
The feedback end of block 30, the feedback signal that described control module 30 receives according to its feedback end controls at it
End output is corresponding with described feedback signal controls signal to the controlled of described first transformation output module 20
End, described first transformation output module 20 adjusts the second electricity of its outfan output according to described control signal
Pressure signal, so that the operating current constant magnitude of described LED load.
The LED that technical solutions of the utility model provide according to feedback module 40 by using control module 30
The operating current output of load controls signal to the first transformation output module 20 accordingly, so that the first transformation
Output module 20 exports the electric current of constant size.Owing to this Switching Power Supply does not include boost module, the signal of telecommunication
In this Switching Power Supply, only need to carry out linear transformation just can realize constant current output.Accordingly, with respect to existing
Technology, the Switching Power Supply that the utility model proposes has the advantages that power supply conversion efficiency is high.
Preferably, as it is shown on figure 3, described first transformation output module 20 include the first switching tube Q1,
Second switch pipe Q2, the first transformator T1, the first electric capacity C1, rectification unit；Described first switching tube
The input that drain electrode is described first transformation output module 20 of Q1, the grid of described first switching tube Q1
For the first controlled end of described first transformation output module 20, the source electrode of described first switching tube Q1 is respectively
Drain electrode with described second switch pipe Q2, the primary side winding of described first transformator T1 one end (such as figure
A end shown in 3) connect, the grid of described second switch pipe Q2 is described first transformation output module
Second controlled end of 20, the source ground DGND of described second switch pipe Q2；Described first transformator
The other end (B end as shown in Figure 3) of the primary side winding of T1 through described first electric capacity C1 ground connection DGND,
First end (E end as shown in Figure 3) of the secondary windings of described first transformator T1 and described rectification list
The first input end of unit connects, and the second end of the secondary windings of described first transformator T1 is (as shown in Figure 3
C end) ground connection GND, the 3rd end of the secondary windings of described first transformator T1 is (as shown in Figure 3
F end) be connected with the second input of described rectification unit；The outfan of described rectification unit is described
The outfan of the first transformation output module 20.It is noted that described rectification unit includes the second electric capacity
C2, the first diode D1 and the second diode D2, one end of described second electric capacity C2 is described rectification
The anode of the first input end of unit, the other end of described second electric capacity C2 and described first diode D1
Connecting, the negative electrode of described first diode D1 is connected with the negative electrode of described second diode D2, and described the
One diode D1 and the outfan that link node is described rectification unit of described second diode D2, institute
State second input that anode is described rectification unit of the second diode D2.Additionally, described first transformation
Output module 20 also includes the output of filter unit, the input of described filter unit and described rectification unit
End connects, and the outfan of described filter unit is the outfan of described first transformation output module 20.Wherein,
Described filter unit includes the 3rd electric capacity C3 and the 4th electric capacity C4；The anode of described 3rd electric capacity C3 and institute
The anode stating the 4th electric capacity C4 connects, the negative electrode of described 3rd electric capacity C3 and described 4th electric capacity C4's
Minus earth GND, the link node of described 3rd electric capacity C3 and described 4th electric capacity C4 is described filtering
The outfan of unit.
According to the circuit structure of described first transformation output module 20, described first switching tube Q1 and
Described second switch pipe Q2 can include three kinds of duties, it may be assumed that described first switching tube Q1 cut-off,
Described second switch pipe Q2 ends；Described first switching tube Q1 cut-off, described second switch pipe Q2 leads
Logical；Described first switching tube Q1 conducting, described second switch pipe Q2 ends.
When described first switching tube Q1 cut-off, during described second switch pipe Q2 cut-off, described first transformation
The primary side winding no current of device T1 flows through, and LED load does not works.For convenience of description, in the present embodiment,
Described LED load is LED load (LED1 to LEDn as shown in Figure 2).
When described first switching tube Q1 cut-off, during described second switch pipe Q2 conducting, described second switch
The grid voltage of pipe Q2 is higher than its source voltage, the A end of the primary side winding of described first transformator T1
The voltage of the B end of the voltage primary side winding higher than described first transformator T1, flows through described first transformator
The sense of current of the primary side winding of T1 is pointed to described B end, described first electric capacity C1 charging by described A end.
Each end points electromotive force of the vice-side winding of described first transformator T1 is ordered as from high to low: E end electromotive force > C
End electromotive force > F end electromotive force.Owing to diode has an one-way conduction characteristic, and described first transformator T1
The C end electromotive force of vice-side winding is zero, therefore, and the F end of the vice-side winding of described first transformator T1 and institute
State no current between the second diode D2 to flow through, and the E end of the vice-side winding of described first transformator T1
And there is electric current to flow through between described first diode D1, now, described second electric capacity C2 and described first
Diode D1 constitutes rectification unit.E end output second electricity of the vice-side winding of described first transformator T1
Pressure signal filters through described 3rd electric capacity C3 and described 4th electric capacity C4 again after described rectification unit rectification,
Described LED load obtains the second voltage signal after rectified Filtering Processing, and described LED load is bright.
When described first switching tube Q1 conducting, during described second switch pipe Q2 cut-off, described first switch
The grid voltage of pipe Q1 is higher than its source voltage, the B end of the primary side winding of described first transformator T1
The electromotive force of the A end of the electromotive force primary side winding higher than described first transformator T1, described first electric capacity C1 is put
Electricity, the sense of current of the primary side winding flowing through described first transformator T1 is pointed to described A by described B end
End.Each end points electromotive force of the vice-side winding of described first transformator T1 is ordered as from high to low: F end electromotive force > C
End electromotive force > E end electromotive force.Owing to diode has an one-way conduction characteristic, and described first transformator T1
The C end electromotive force of vice-side winding is zero, therefore, and the E end of the vice-side winding of described first transformator T1 and institute
State no current between the first diode D1 to flow through, and the F end of the vice-side winding of described first transformator T1
And having electric current to flow through between described second diode D2, now, described second diode D2 constitutes rectification
Unit.The F end of the vice-side winding of described first transformator T1 exports the second voltage signal through described rectification list
Again through described 3rd electric capacity C3 and described 4th electric capacity C4 filtering after unit's rectification, described LED load obtains
The second voltage signal after rectified Filtering Processing, described LED load is bright.
It is understood that owing to technical solutions of the utility model are according to institute by described control module 30
The output voltage that the feedback signal that stating feedback module 40 provides adjusts described first transformation output module 20 is big
Little, and then realize the constant-current driving to described LED load.Therefore, via described first transformation output mould
The magnitude of voltage size of the second voltage signal of block 20 output is to exist in the running of described Switching Power Supply
Change, and the second voltage signal of this existence change does not affect described Switching Power Supply to described LED load
Constant-current driving.
Described first transformation output module 20 is according to described first switching tube Q1 and described second switch pipe Q2
Conducting state its outfan export the corresponding signal of telecommunication, simple in construction, it is simple to control.
Preferably, described control module 30 includes control chip U and the second transformator T2；Described control
The feedback end of chip U is the feedback end of described control module 30, first output of described control chip U
End is connected with one end of the primary side winding of described second transformator T2, second output of described control chip U
End is connected with the other end of the primary side winding of described second transformator T2；The of described second transformator T2
One end of one vice-side winding is the first control end of described control module 30, described second transformator T2's
The other end of the second vice-side winding is connected with the source electrode of described first switching tube Q1, described second transformator
One end of second vice-side winding of T2 is the second control end of described control module 30, described second transformator
The other end ground connection DGND of second vice-side winding of T2.In the present embodiment, the type of described control chip U
Number it is OZ9976.
When described control module 30 starts, the feedback end of described control module 30 receives a feedback letter
Number, described control chip U is same respectively at its first outfan and the second outfan according to described feedback signal
Time export the first control signal and second and control signal to the primary side winding of described second transformator T2, described
Described first control signal and described second are controlled letter and are amplified and after anti-phase process by the second transformator T2
Export at its first vice-side winding and the second vice-side winding respectively.It should be noted that described first controls
Signal and described second control signal opposite in phase.Set up described control module 30 so that described switch electricity
Source just can realize constant current output without boost module, had both improve power supply conversion efficiency and in turn simplify circuit
Structure.
It is noted that described feedback module 40 includes for gathering the work flowing through described LED load
Make size of current the first resistance R1, first end of described first resistance R1 and the output of described LED load
End connects, the second end ground connection of described first resistance R1.Additionally, when described LED load works,
The magnitude of voltage of first end of described first resistance R1 is that the input of described feedback module 40 is to described control module
The feedback signal of 30.
Further, as in figure 2 it is shown, described Switching Power Supply also includes providing the of running voltage to movement
Two transformation output modules, the input of described second transformation output module 50 and described power module 10
Outfan connects, and the outfan of described second transformation output module 50 is connected with described movement.Wherein, institute
State the second transformation output module 50 and include the 3rd transformator T3, PWM controller the 501, the 3rd switching tube
Q3 and secondary commutation filter circuit 502；One end of the primary side winding of described 3rd transformator T3 is described
The input of two transformation output modules 50, the other end of the primary side winding of described 3rd transformator T3 and institute
The drain electrode stating the 3rd switching tube Q3 connects；The grid of described 3rd switching tube Q3 controls with described PWM
Device 501 connects, the source ground DGND of described 3rd switching tube Q3；Described 3rd transformator T3's
Vice-side winding is connected with the input of described secondary commutation filter circuit 502, described secondary commutation filtered electrical
The outfan on road 502 is the outfan of described second transformation output module 50.
When described second transformation output module 50 starts, described PWM controller 501 is to the described 3rd
Switching tube Q3 carries out on-off control, so that one end output of described 3rd transformator T3 and described movement
The tertiary voltage signal that running voltage size matches, described tertiary voltage signal is filtered through described secondary commutation
Wave circuit 502 exports after carrying out rectifying and wave-filtering process, and described movement obtains running voltage.Set up described
Two transformation output modules 50 so that the Switching Power Supply that the utility model proposes can meet the perseverance of LED load
Stream power demands, can meet again the constant voltage power demands of movement.
Hereinafter, in conjunction with Fig. 1 to 3, the operation principle of this utility model Switching Power Supply is described:
When described Switching Power Supply starts, the input of described rectifier bridge 101 obtains line voltage, described
Described line voltage is carried out rectification process and exports by rectifier bridge 101, and described PFC boost unit 102 will
Line voltage after rectified process is filtered and boosting processes, and exports the 4th voltage at its outfan
Signal, the 4th voltage signal is d. c. voltage signal, and size is about 400V.Described first switching tube
The drain electrode of Q1 obtains described 4th voltage signal, and meanwhile, the grid of described first switching tube Q1 connects
Receiving amplified described first control signal, the grid of described second switch pipe Q2 receives amplified
Described second control signal.It should be noted that described first control signal and the second control signal are permissible
Exported at random by described control module 30, it is also possible to when described Switching Power Supply is dispatched from the factory in described control module
It is fixedly installed in 30, does not limits.Operation principle according to above-mentioned first transformation output module 20 can
Knowing, at synchronization, described first switching tube Q1 and described second switch pipe Q2 at most only one of which are led
Logical, and when a conducting in described first switching tube Q1 and described second switch pipe Q2, described the
The outfan of one transformation output module 20 exports the second voltage signal extremely described LED load immediately, described
LED load works.Hereafter, described control chip U passes through feedback module 40 (first as shown in Figure 2
Resistance R1) obtain the operating current that described LED load is current, described control module 30 is fed back according to it
The described operating current that the described LED load of end acquisition is current controls at its first control end and second respectively
End output the first control signal and the second control signal, described first control signal and described second controls letter
Number through described second transformator T2 amplify after be delivered to the first of described first transformation output module 20 respectively
Controlling end and second and control end, described first transformation output module 20 is according to described first control signal and institute
The ON time stating the second control signal adjustment described first switching tube Q1 and described second switch pipe Q2 accounts for
Empty ratio, so that the electric current of the outfan output constant size of described first transformation output module 20.Need
Be noted that described first transformator T1 vice-side winding E end and C end between and F end and C
Umber of turn between end is identical, so that the E end of the vice-side winding of described first transformator T1 and F end are defeated
The magnitude of voltage size gone out is identical.
Additionally, one end of the primary side winding of the 3rd transformator T3 of described second transformation output module 50 is obtained
Obtaining the DC voltage of described power module 10 output, described PWM controller 501 is to described 3rd switch
Pipe Q3 carries out on-off control, one end output tertiary voltage letter of the vice-side winding of described 3rd transformator T3
Number to described secondary commutation filter circuit 502, after described secondary commutation filter circuit 502 rectifying and wave-filtering
Described tertiary voltage signal provides running voltage, described movement to start working for movement.
This utility model also proposes a kind of television set, and this television set includes Switching Power Supply as above, should
The concrete structure of Switching Power Supply is with reference to above-described embodiment, owing to this television set have employed above-mentioned all embodiments
Technical scheme, the most at least there are all beneficial effects that the technical scheme of above-described embodiment is brought,
This is no longer going to repeat them.Wherein, described Switching Power Supply includes that power module the 10, first transformation exports mould
Block 20, control module 30 and feedback module 40；The outfan of described power module 10 becomes with described first
The input of pressure output module 20 connects, and the outfan of described first transformation output module 20 is born with LED
Carrying and connect, the controlled end of described first transformation output module 20 connects with the control end of described control module 30
Connecing, the feedback end of described control module 30 is connected with the outfan of described feedback module 40, described feedback
The signals collecting end of module 40 is connected with described LED load, and described power module 10 is for described the
One transformation output module 20 provides DC power supply；Described first transformation output module 20 is for institute
State LED load and running voltage is provided；Described control module 30 is used for driving described first transformation output mould
Block 20 works, and the operating current of the described LED load according to described feedback module 40 feedback, output
Corresponding control signal adjusts the output electric current of described first transformation output module 20, so that described load work
Make current constant.
The foregoing is only preferred embodiment of the present utility model, not thereby limit of the present utility model specially
Profit scope, every under inventive concept of the present utility model, in utilizing this utility model description and accompanying drawing
The equivalent structure transformation of Rong Suozuo, or directly/be indirectly used in other relevant technical fields and be included in this
In the scope of patent protection of utility model.
Claims (10)
1. a Switching Power Supply, it is characterised in that include power module, the first transformation output module, control module and feedback module；The outfan of described power module is connected with the input of described first transformation output module, the outfan of described first transformation output module is connected with LED load, the described controlled end of the first transformation output module is connected with the control end of described control module, the feedback end of described control module is connected with the outfan of described feedback module, and the signals collecting end of described feedback module is connected with described LED load；
Wherein, described power module is for providing DC power supply to described first transformation output module；Described first transformation output module is for providing running voltage to described LED load；Described control module is used for driving described first transformation output module work, and the operating current of the described LED load fed back according to described feedback module, export corresponding control signal and adjust the output electric current of described first transformation output module, so that described loaded work piece current constant.
2. Switching Power Supply as claimed in claim 1, it is characterised in that described first transformation output module includes the first switching tube, second switch pipe, the first transformator, the first electric capacity, rectification unit；The input that drain electrode is described first transformation output module of described first switching tube, the grid of described first switching tube is the first controlled end of described first transformation output module, the source electrode of described first switching tube one end with the drain electrode of described second switch pipe, the primary side winding of described first transformator respectively is connected, the grid of described second switch pipe is the second controlled end of described first transformation output module, the source ground of described second switch pipe；The other end of the primary side winding of described first transformator is through described first capacity earth, first end of the secondary windings of described first transformator is connected with the first input end of described rectification unit, second end ground connection of the secondary windings of described first transformator, the 3rd end of the secondary windings of described first transformator is connected with the second input of described rectification unit；The outfan of described rectification unit is the outfan of described first transformation output module.
3. Switching Power Supply as claimed in claim 2, it is characterized in that, described rectification unit includes the second electric capacity, the first diode and the second diode, the first input end that one end is described rectification unit of described second electric capacity, the other end of described second electric capacity is connected with the anode of described first diode, the negative electrode of described first diode is connected with the negative electrode of described second diode, described first diode and the outfan that link node is described rectification unit of described second diode, second input that anode is described rectification unit of described second diode.
4. Switching Power Supply as claimed in claim 2, it is characterized in that, described first transformation output module also includes that filter unit, the input of described filter unit are connected with the outfan of described rectification unit, and the outfan of described filter unit is the outfan of described first transformation output module.
5. Switching Power Supply as claimed in claim 4, it is characterised in that described filter unit includes the 3rd electric capacity and the 4th electric capacity；The anode of described 3rd electric capacity is connected with the anode of described 4th electric capacity, the negative electrode of described 3rd electric capacity and the minus earth of described 4th electric capacity, described 3rd electric capacity and the outfan that link node is described filter unit of described 4th electric capacity.
6. Switching Power Supply as claimed in claim 2, it is characterised in that described control module includes control chip and the second transformator；The feedback end of described control chip is the feedback end of described control module, first outfan of described control chip is connected with one end of the primary side winding of described second transformator, and the second outfan of described control chip is connected with the other end of the primary side winding of described second transformator；One end is described control module first control end of the first vice-side winding of described second transformator, the other end of the second vice-side winding of described second transformator and the source electrode of the first switching tube connect, one end is described control module second control end of the second vice-side winding of described second transformator, the other end ground connection of the second vice-side winding of described second transformator.
7. Switching Power Supply as claimed in claim 1, it is characterised in that described power module includes rectifier bridge and PFC boost unit；The input of described rectifier bridge is used for input ac power, and the outfan of described rectifier bridge is connected with the input of described PFC boost unit, the outfan that outfan is described power module of described PFC boost unit.
8. the Switching Power Supply as described in claim 1 to 7 any one, it is characterized in that, described Switching Power Supply also includes the second transformation output module providing running voltage to movement, the described input of the second transformation output module is connected with the outfan of described power module, and the outfan of described second transformation output module is connected with described movement.
9. Switching Power Supply as claimed in claim 8, it is characterised in that described second transformation output module includes the 3rd transformator, PWM controller, the 3rd switching tube and secondary commutation filter circuit；One end of the primary side winding of described 3rd transformator is the input of described second transformation output module, and the other end of the primary side winding of described 3rd transformator is connected with the drain electrode of described 3rd switching tube；The grid of described 3rd switching tube is connected with described PWM controller, the source ground of described 3rd switching tube；The vice-side winding of described 3rd transformator is connected with the input of described secondary commutation filter circuit, and the outfan of described secondary commutation filter circuit is the outfan of described second transformation output module.
10. a television set, it is characterised in that include the Switching Power Supply as described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521035725.0U CN205596216U (en) | 2015-12-11 | 2015-12-11 | Switching power supply and TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521035725.0U CN205596216U (en) | 2015-12-11 | 2015-12-11 | Switching power supply and TV set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205596216U true CN205596216U (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521035725.0U Expired - Fee Related CN205596216U (en) | 2015-12-11 | 2015-12-11 | Switching power supply and TV set |
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| Country | Link |
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| CN (1) | CN205596216U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733241A (en) * | 2017-11-14 | 2018-02-23 | 深圳睿舍智能科技有限公司 | Double primary side insulating power supplies |
| CN108008200A (en) * | 2016-11-28 | 2018-05-08 | 芜湖美的厨卫电器制造有限公司 | Water resistance detection device and watering equipment |
| CN109274910A (en) * | 2018-11-07 | 2019-01-25 | 深圳创维－Rgb电子有限公司 | A kind of Switching Power Supply and TV |
-
2015
- 2015-12-11 CN CN201521035725.0U patent/CN205596216U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008200A (en) * | 2016-11-28 | 2018-05-08 | 芜湖美的厨卫电器制造有限公司 | Water resistance detection device and watering equipment |
| CN107733241A (en) * | 2017-11-14 | 2018-02-23 | 深圳睿舍智能科技有限公司 | Double primary side insulating power supplies |
| CN109274910A (en) * | 2018-11-07 | 2019-01-25 | 深圳创维－Rgb电子有限公司 | A kind of Switching Power Supply and TV |
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Granted publication date: 20160921 Termination date: 20201211 |