CN109151351A - A kind of power panel and TV - Google Patents
A kind of power panel and TV Download PDFInfo
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- CN109151351A CN109151351A CN201811113750.4A CN201811113750A CN109151351A CN 109151351 A CN109151351 A CN 109151351A CN 201811113750 A CN201811113750 A CN 201811113750A CN 109151351 A CN109151351 A CN 109151351A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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Abstract
The embodiment of the invention discloses a kind of power panel and TV, the power panel includes: half-bridge resonance LLC transformer unit, control chip, output voltage selecting unit and rectification unit；Wherein, half-bridge resonance LLC transformer unit is used to generate at least three kinds of first target voltage under the control of control chip；Output voltage selecting unit is used to select one of first target voltage from least three kinds of first target voltage that the half-bridge resonance LLC transformer unit generates, and the first target voltage of selection is exported to rectification unit；Rectification unit is used to receive first target voltage by the output voltage selecting unit, and exports the first target voltage after rectifying to the first target voltage received；Wherein, the value of at least three kinds first target voltage is different.The power panel can provide a variety of different output voltages, can match a plurality of constant current plates, have higher compatibility.
Description
Technical field
The present embodiments relate to LED television power technique fields more particularly to a kind of power panels and TV.
Background technique
With the high speed development of LED (Light Emitting Diode, light emitting diode) LCD TV, currently, LED liquid
Brilliant TV has spread to huge numbers of families.
Existing LED liquid crystal television is all made of power panel+constant current plate design method, wherein power panel is responsible for constant current
Plate and TV motherboard provide suitable input voltage, and constant current plate is responsible for LED backlight mould group and provides constant electric current, constant current plate
In generally use BOOST constant current scheme or BUCK constant current scheme.After the specification of LED backlight mould group determines, with the LED backlight
The matched constant current plate input voltage of mould group, the i.e. output voltage of power panel are also determining, existing power panel design scheme
Can match with a kind of LED backlight mould group of specification, i.e., power panel can only provide a kind of output voltage and constant current plate BOOST or
The input voltage of person BUCK matches.
Therefore, existing power panel design scheme has following defects that power panel cannot provide voltage in several modes, realizes
Not only the BOOST constant current scheme of constant current plate can have been matched, but also BUCK constant current scheme can be matched；When the size of liquid crystal display changes
When, the specification of corresponding LED backlight mould group also changes, and therefore, the input voltage of constant current plate also changes, therefore needs weight
The output voltage of new adjustment power panel, that is, need to redesign power panel, and since power panel is safety device, every time
It is required to re-start the certification of related specification after redesigning power panel, increases manpower and financial resources cost.
Summary of the invention
The embodiment of the present invention provides a kind of power panel and TV, and the power panel can provide a variety of different outputs electricity
Pressure, can match a plurality of constant current plates, have higher compatibility.
To achieve the above object, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, the power panel includes: half-bridge resonance LLC transformation the embodiment of the invention provides a kind of power panel
Device unit, control chip, output voltage selecting unit and rectification unit；
Wherein, the input terminal of the half-bridge resonance LLC transformer unit is connected with external input power, control terminal with it is described
Chip is controlled to be connected, the first output end of the half-bridge resonance LLC transformer unit is connected with the output voltage selecting unit,
For generating at least three kinds of first target voltage under the control of the control chip；
The first output end phase of one end of the output voltage selecting unit and the half-bridge resonance LLC transformer unit
Even, the other end is connected with the rectification unit, at least three kind first for generating from the half-bridge resonance LLC transformer unit
One of first target voltage is selected in target voltage, and the first target voltage of selection is exported to the rectification unit；
The input terminal of the rectification unit is connected with one end of the output voltage selecting unit, for passing through the output
Voltage selecting unit receives first target voltage, and by the first object after rectifying to the first target voltage received
Voltage output；
Wherein, the value of at least three kinds first target voltage is different.
Further, the first target voltage of the rectification unit output is that the constant current plate of LED liquid crystal television is powered；
The half-bridge resonance LLC transformer unit further includes second output terminal, for exporting a kind of second target voltage, institute
State the main board power supply that the second target voltage is LED liquid crystal television.
Further, the power panel further include: voltage sampling unit and feedback unit；
Wherein, the first input end of the voltage sampling unit is connected with the output end of the rectification unit, the voltage
Second input terminal of sampling unit is connected with the second output terminal of the half-bridge resonance LLC transformer unit, the voltage sample
The output end of unit is connected with the input terminal of the feedback unit, the first target voltage for being exported to the rectification unit into
Row sampling, and feedback voltage is generated according to sampled voltage, the feedback voltage is exported to the feedback unit；
The output end of the feedback unit is connected with the control chip, for the feedback voltage to be conveyed to the control
Coremaking piece makes so that the control chip controls the half-bridge resonance LLC transformer unit according to the feedback voltage
The change rate of the first target voltage of the rectification unit output becomes smaller.
Further, the half-bridge resonance LLC transformer unit includes: first switch tube, second switch, the first electricity
Hold, primary winding and constant current input secondary windings；
Wherein, the second end of the first switch tube is connected with external input power, first end and the control chip
Pin is connected, and third end is connected with the second end of the first end of primary winding and second switch respectively；
The first end of the second switch with it is described control chip pin be connected, third end ground connection and while with it is described
The first end of first capacitor is connected, and the second end of the first capacitor is connected with the second end of primary winding；
The constant current input secondary windings includes first group of coil and second group of coil, the second end of first group of coil
Be connected with the first end of second group of coil, the corresponding output of the first end and second end of first group of coil the first first
Target voltage, first end and second end second of first target voltage of corresponding output of second group of coil, described first group
The first end of coil and corresponding the third first target voltage of output of the second end of second group of coil.
Further, the output voltage selecting unit includes that first switch, second switch, third switch and the 4th open
It closes,
Wherein, the first end of the first switch is connected with the first end of first group of coil, and the second of first switch
End is connected with the rectification unit；
The first end of the second switch is connected with the second end of first group of coil, the second end of the second switch
It is connected with the rectification unit；
The first end of the third switch is connected with the first end of second group of coil, the second end of the third switch
It is connected with the rectification unit；
The first end of 4th switch is connected with the second end of second group of coil, the second end of the 4th switch
It is connected with the rectification unit.
Further, the rectification unit includes the 5th diode, the 6th diode, the 7th diode and the eight or two pole
Pipe, wherein the 5th diode and the 7th Diode series, the 6th diode and the 8th diode string
Connection, the series arm and the 5th diode and the seven or two pole of the 6th diode and the 8th diode composition
The series arm of pipe composition is in parallel, and the anode of the 5th diode is opened with the second end of the first switch and described second
The second end of pass is connected, and the of the second end and the 4th switch of the cathode of the 8th diode and third switch
Two ends are connected.
Further, the half-bridge resonance LLC transformer unit further include: main board power supply secondary windings, the mainboard supply
Electric secondary windings and the primary winding incude, and generate the second target voltage, for the confession of the mainboard of LED liquid crystal television
Electricity.
Further, the voltage sampling unit includes: the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and
Three switching tubes,
Wherein, one end of the 5th resistance is connected with the cathode of the 6th diode, and the other end passes through the 6th resistance
Ground connection, the other end of the 5th resistance are also connected with the first end of the third switching tube, the third of the third switching tube
End is connected with one end of the main board power supply secondary windings, one end of the second end of the third switching tube and the 7th resistance
It is connected, the other end ground connection of the 7th resistance, one end of the 8th resistance is connected with the second end of the third switching tube,
The other end is connected with feedback unit.
Second aspect, the embodiment of the present invention also provide a kind of TV, and the TV includes electricity described in above-mentioned first aspect
Source plate.
A kind of power panel provided in an embodiment of the present invention, by generating at least three kinds not using half-bridge resonance LLC transformer
With the output voltage of numerical value, cooperates output voltage selecting unit, become by output voltage selecting unit from the half-bridge resonance LLC
One of output voltage is selected at least three kinds of output voltages that depressor unit generates, and the output voltage of selection is exported,
Realizing makes the power panel can provide a variety of different output voltages, can match a plurality of constant current plates, have compared with highly compatible
Purpose.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of power panel provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another power panel provided in an embodiment of the present invention；
Fig. 3 is a kind of particular circuit configurations schematic diagram of power panel provided in an embodiment of the present invention.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment
Fig. 1 is a kind of structural schematic diagram of power panel provided in an embodiment of the present invention.Power panel disclosed in the present embodiment can
Suitable for LED liquid crystal television field or other need to carry out with constant current plate matched to use electrical domain.Referring specifically to shown in Fig. 1,
The power panel includes:
Half-bridge resonance LLC transformer unit 110, control chip 120, output voltage selecting unit 130 and rectification unit
140；
Wherein, the input terminal VIN of half-bridge resonance LLC transformer unit 110 is connected with external input power, control terminal C with
It controls chip 120 to be connected, the first output end VOUT1 and output voltage selecting unit of half-bridge resonance LLC transformer unit 110
130 are connected, for generating at least three kinds of first target voltage under the control of control chip 120；
One end of output voltage selecting unit 130 and the first output end VOUT1 of half-bridge resonance LLC transformer unit 110
It is connected, the other end is connected with rectification unit 140, at least three kind first for generating from half-bridge resonance LLC transformer unit 110
One of first target voltage is selected in target voltage, and the first target voltage of selection is exported to rectification unit 140；
The input terminal of rectification unit 140 is connected with one end of output voltage selecting unit 130, for being selected by output voltage
It selects unit 130 and receives first target voltage, and by the first object electricity after being rectified to the first target voltage received
Pressure output；
Wherein, the value of at least three kinds first target voltage is different.
Specifically, when the power panel is applied at LED liquid crystal television field, the first object of the output of rectification unit 140
Voltage Vout is that the constant current plate 150 of LED liquid crystal television is powered；Corresponding, half-bridge resonance LLC transformer unit 110 usually also wraps
Second output terminal VOUT2 is included, for exporting a kind of second target voltage, second target voltage is the master of LED liquid crystal television
Plate power supply, second target voltage is usually 12V.
Further, with reference to the structural schematic diagram of another power panel shown in Fig. 2, the power panel further include:
Voltage sampling unit 160 and feedback unit 170, wherein the first input end of voltage sampling unit 160 and rectification unit 140
Output end is connected, the second input terminal of voltage sampling unit 160 and the second output terminal of half-bridge resonance LLC transformer unit 110
VOUT2 is connected, and the output end of voltage sampling unit 160 is connected with the input terminal of feedback unit 170, for rectification unit 140
The first target voltage Vout of output is sampled, and generates feedback voltage according to sampled voltage, and the feedback voltage is exported
To feedback unit 170；The output end of feedback unit 170 is connected with control chip 110, for the feedback voltage to be conveyed to control
Coremaking piece 110, so that control chip 110 controls half-bridge resonance LLC transformer unit 110 according to the feedback voltage,
The change rate for the first target voltage Vout for exporting rectification unit 140 becomes smaller.In general, if half-bridge resonance LLC transformer unit
If the load very little of 110 side second output terminal VOUT2, will lead to half-bridge resonance LLC transformer unit 110 first are defeated
The voltage of outlet VOUT1 rises very high, causes the voltage of the first output end VOUT1 of half-bridge resonance LLC transformer unit 110 not
Stablize, output pulsation is larger, therefore, in order to reduce half-bridge resonance LLC transformer unit 110 the first output end VOUT1 electricity
Buckling rate, embodiment adds voltage sampling unit 160 and feedback units 170, by control chip 120 according to feedback
The voltage of 170 feedback of member controls half-bridge resonance LLC transformer unit 110, makes half-bridge humorous by way of closed-loop control
The voltage of first output end VOUT1 of vibration LLC transformer unit 110 is relatively stable, and 170 strong interference immunity of feedback unit makes
The stability for obtaining output voltage is more preferable, while being conducive to the stability of the power supply feedback of multiple-channel output.
Further, the particular circuit configurations schematic diagram of a kind of power panel shown in Figure 3, Fig. 3 give above-mentioned each
Unit (half-bridge resonance LLC transformer unit 110, output voltage selecting unit 130, rectification unit 140, voltage sampling unit 160
With feedback unit 170) specific implementation circuit diagram.Specifically, half-bridge resonance LLC transformer unit 110 includes: first switch
Pipe Q1, second switch Q2, first capacitor C1, primary winding W and constant current input secondary windings M1；Wherein, it first opens
The second end 2 for closing pipe Q1 is connected with external input power VIN, and first end 1 is connected with the pin of control chip 110, and third end 3 is divided
It is not connected with the second end 2 of the first end 1 of primary winding W and second switch Q2；The first of second switch Q2
End 1 is connected with the pin of control chip IC, and the ground connection of third end 3 is simultaneously connected with the first end of first capacitor C1 simultaneously, first capacitor
The second end of C1 is connected with the second end 2 of primary winding W；It includes first group of coil and that constant current, which inputs secondary windings M1,
Two groups of coils, the second end 12 of first group of coil are connected with the first end 11 of second group of coil, the first end 13 of first group of coil
With corresponding output the first first target voltage V1 of second end 12, the corresponding output of the first end 11 and second end 10 of second group of coil
The second end 10 of second of first target voltage V2, the first end 13 of first group of coil and second group of coil is corresponding to export the third
First target voltage V1+V2.First target voltage V1 V2 the numerical value of V1+V2 can be by the primary of half-bridge resonance LLC transformer
The number of turns of winding W and first group of coil and second group of coil determines.As a kind of achievable mode, primary winding W
Both ends can be separately connected the first pin PIN1 and the second pin PIN2 of transformer chip T1；Constant current inputs secondary windings M1
Using 2 groups of coils (i.e. first group of coil and second group of coil) and around tapped mode, according to constant current plate input voltage
It needs, first group of coil corresponds to output voltage V1, and the both ends of first group of coil, which can be separately connected, connects the tenth of transformer chip T1
Two pin PIN12 and the tenth three-prong PIN13, the corresponding output voltage of second group of coil are V2, and the both ends of second group of coil can
Be separately connected the 11st pin PIN11 and the tenth pin PIN10 for meeting transformer chip T1, wherein the 11st pin PIN11 and
12nd pin PIN12 is connected.
The output voltage selecting unit 130 includes first switch J1, second switch J2, the switch of third switch J3 and the 4th
J4, wherein the first end of first switch J1 is connected with the first end 13 of first group of coil, the second end and rectification of first switch J1
Unit 140 is connected；The first end of second switch J2 is connected with the second end 12 of first group of coil, the second end of second switch J2 with
Rectification unit 140 is connected；The first end of third switch J3 is connected with the first end 11 of second group of coil, and the second of third switch J3
End is connected with rectification unit 140；The first end of 4th switch J4 is connected with the second end 10 of second group of coil, the 4th switch J4's
Second end is connected with rectification unit 140.When desired first target voltage is V1, i.e., when the input voltage of constant current plate is V1,
First target voltage can be obtained from the first end 13 and second end 12 of first group of coil by first switch J1 and third switch J3
For V1；When desired first target voltage is V2, i.e., when the input voltage of constant current plate is V2, second switch J2 and the can be passed through
It is V2 that four switch J4, which obtain first target voltage from the first end 11 and second end 10 of second group of coil,；When desired first object
It, i.e., can be by first switch J1 and the 4th switch J4 from first when the input voltage of constant current plate is V1+V2 when voltage is V1+V2
It is V1+V2 that the first end 13 of group coil and the second end 10 of second group of coil, which obtain first target voltage,.First switch J1, second
Switch J2, third switch J3 and the 4th switch J4 can be designed by wire jumper in PCB circuit board and be realized connection related switch
Function.
Rectification unit 140 includes the 5th diode D5, the 6th diode D6, the 7th diode D7 and the 8th diode D8,
Wherein, the 5th diode D5 and the 7th diode D7 series connection, the 6th diode D6 and the 8th diode D8 series connection, the 6th diode
The series arm of D6 and the 8th diode D8 composition is in parallel with the series arm that the 5th diode D5 and the 7th diode D7 is formed,
The anode of 5th diode D5 is connected with the second end of the second end of first switch J1 and second switch J2, the 8th diode D8
Cathode be connected with the second end of the second end of third switch J3 and the 4th switch J4.
Power panel provided in this embodiment can export the principle of plurality of optional voltage are as follows: when the input voltage of constant current plate
When (i.e. the output voltage Vout of power panel) needs to be designed as Vout=V1, PCB design is connected first using the mode of wire jumper and is opened
Close J1 and second switch J3.In the positive half cycle (within the scope of i.e. 0 ° -180 °) of constant current input secondary windings M1 output waveform, output electricity
Pressure is back to constant current input after the 8th diode D8- third switch J3 of the 5th diode D5- Constant Current Load C3- of first switch J1-
Secondary windings M1；In the negative half period (within the scope of i.e. 180 ° -360 °) of constant current input secondary windings M1 output waveform, output voltage warp
It is secondary that constant current input is back to after the 7th diode D7- first switch J1 of the 6th diode D6- Constant Current Load C3- of third switch J3-
Winding M1, the output voltage V1 after rectifying and wave-filtering.
When the input voltage (i.e. the output voltage Vout of power panel) of constant current plate needs to be designed as Vout=V2, PCB is set
Meter connects second switch J2 and the 4th switch J4 using the mode of wire jumper.Just the half of constant current input secondary windings M1 output waveform
All (within the scope of i.e. 0 ° -180 °), output voltage is through the 8th diode of the 5th diode D5- Constant Current Load C3- of second switch J2-
Constant current input secondary windings M1 is back to after the 4th switch J4 of D8-；The negative half period of secondary windings M1 output waveform is inputted (i.e. in constant current
Within the scope of 180 ° -360 °), output voltage is through the 7th diode D7- of the 6th diode D6- Constant Current Load C3- of the 4th switch J4-
Constant current input secondary windings M1, the output voltage V2 after rectifying and wave-filtering are back to after two switch J2.
When the input voltage (i.e. the output voltage Vout of power panel) of constant current plate needs to be designed as Vout=V1+V2, PCB
Design connects first switch J1 and the 4th switch J4 by using the mode of wire jumper.Secondary windings M1 output waveform is inputted in constant current
Positive half cycle (within the scope of i.e. 0 ° -180 °), output voltage is through the 5th diode D5- Constant Current Load C3- the eight or two of first switch J1-
Constant current input secondary windings M1 is back to after the 4th switch J4 of pole pipe D8-；In negative half period (i.e. 180 ° of -360 ° of ranges of output waveform
It is interior), output voltage returns after the 7th diode D7- first switch J1 of the 6th diode D6- Constant Current Load C3- of the 4th switch J4-
Secondary windings M1, the output voltage V1+V2 after rectifying and wave-filtering are inputted to constant current.
Therefore, as shown in the above, different constant currents can be matched by the way that the value of suitable V1, V2 and V1+V2 is arranged
Topological (BOOST constant current scheme or BUCK constant current scheme) flexibly and easily, while being decreased due to screen (liquid crystal display body rule
Lattice change) because of parameter change caused by transformer matching problem and power supply certification, it is a plurality of to realize a power panel matching
The purpose of constant current plate.Suitable input electricity may be selected according to screen body power in the optimal design for being conducive to constant current plate power device
Pressure, i.e. V1 or V2 or V1+V2, improve the power conversion efficiency of constant current plate, reduce the temperature rise of power device.Meanwhile favorably
In the General design of power panel, the design scheme of the power panel improved through this embodiment improves the compatibility of power panel,
Realizing only need to once authenticate, and can match different constant current plates, to simplify the certification of power panel, save certification expense
And the time.
Further, half-bridge resonance LLC transformer unit 110 further include: main board power supply secondary windings M2, main board power supply
Grade winding M2 and primary winding W incudes, and generates the second target voltage, described with the main board power supply for LED liquid crystal television
Second target voltage is usually 12V, can also pass through the coil of change main board power supply secondary windings M2 according to specific needs certainly
The numerical value of second target voltage is arranged in the number of turns.
Illustratively, voltage sampling unit 160 includes: the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th electricity
Hinder R8 and third switching tube Q3, wherein one end of the 5th resistance R5 is connected with the cathode of the 6th diode D6, and the other end passes through the
Six resistance R6 ground connection, the other end of the 5th resistance R5 is also connected with the first end of third switching tube Q3, and the of third switching tube Q3
Three ends are connected with one end of main board power supply secondary windings M2, the second end and one end phase of the 7th resistance R7 of third switching tube Q3
Even, the other end of the 7th resistance R7 ground connection, one end of the 8th resistance R8 are connected with the second end of third switching tube Q3, the other end and
Feedback unit 170 is connected.In general, will lead to constant current input secondary windings if the load very little of the side main board power supply secondary windings M2
The output voltage Vout of the side M1 rises very high, when output voltage Vout is increased, passes through the 5th resistance R5 and the 6th R6 pairs of resistance
After output voltage Vout partial pressure, third switching tube Q3 conducting, by adjusting the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7
Resistance value so that the voltage stabilization of third switching tube second end A point is reached feedback by the 8th resistance R8 in 5V, and by the voltage of A point
The voltage of A point is further converted to the feedback electricity that control chip 120 can receive and identify by unit 170, feedback unit 170
Pressure, and feedback voltage is delivered to control chip 120, control chip 120 adjusts first switch tube Q1 and the according to feedback voltage
The on-off frequency of two switching tube Q2 tends to the value of the output voltage Vout of the constant current input side secondary windings M1
Stablize, so that the stability of output voltage Vout is more preferable, the noise immunity of feedback unit 170 is stronger, while it is defeated to be conducive to multichannel
The stability of power supply feedback out.
A kind of power panel provided in this embodiment, using by transformer winding, output voltage selecting unit and bridge rectifier
The mode combined may be selected three groups of different output voltages and give constant current plate according to the design needs, design corresponding three kinds of output
After the transformer of voltage, the constant current scheme of constant current plate is by output voltage selecting unit, two kinds of perseverances of BOOST or BUCK of flexibly arranging in pairs or groups
Flow topological structure.For same constant current topological structure, the constant current plate of three kinds of output voltage matching rear classes also can be selected, really do
It has arrived a power panel and has matched a plurality of constant current plates.The program is conducive to the optimal design of constant current plate power device, according to screen body function
Suitable input voltage, i.e. V1 or V2 or V1+V2 may be selected in rate, to improve the power conversion efficiency of constant current plate.Meanwhile it adopting
With the power panel design scheme, after LED backlight mould group specification determines, a kind of power transformer output electricity can only be selected by solving
The problem of pressure and the input voltage of the BOOST or BUCK of constant current plate part match, substantially increases the versatility of power panel,
Reduce power type, reduce the certification number of power panel, while cooperating voltage sampling unit, so that the feedback of power panel
The anti-interference of member is more preferable, realizes that output voltage has the purpose of better stability.
Based on the above technical solution, further, the embodiment of the present invention also provides a kind of TV, which includes
Above-mentioned power panel.
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
It can be realized by software and required common hardware, naturally it is also possible to which by hardware realization, but in many cases, the former is more
Good embodiment.Based on this understanding, technical solution of the present invention substantially in other words contributes to the prior art
Part can be embodied in the form of software products, which can store in computer readable storage medium
In, floppy disk, read-only memory (Read-Only Memory, ROM), random access memory (Random such as computer
Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are with so that a computer is set
Standby (can be personal computer, storage medium or the network equipment etc.) executes described in each embodiment of the present invention.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (9)
1. a kind of power panel, which is characterized in that the power panel includes: half-bridge resonance LLC transformer unit, controls chip, is defeated
Voltage selecting unit and rectification unit out；
Wherein, the input terminal of the half-bridge resonance LLC transformer unit is connected with external input power, control terminal and the control
Chip is connected, and the first output end of the half-bridge resonance LLC transformer unit is connected with the output voltage selecting unit, is used for
At least three kinds of first target voltage are generated under the control of the control chip；
One end of the output voltage selecting unit is connected with the first output end of the half-bridge resonance LLC transformer unit, separately
One end is connected with the rectification unit, at least three kinds of first objects for generating from the half-bridge resonance LLC transformer unit
One of first target voltage is selected in voltage, and the first target voltage of selection is exported to the rectification unit；
The input terminal of the rectification unit is connected with one end of the output voltage selecting unit, for passing through the output voltage
Selecting unit receives first target voltage, and by the first target voltage after rectifying to the first target voltage received
Output；
Wherein, the value of at least three kinds first target voltage is different.
2. power panel according to claim 1, which is characterized in that the first target voltage of rectification unit output is
The constant current plate of LED liquid crystal television is powered；
The half-bridge resonance LLC transformer unit further includes second output terminal, for exporting a kind of second target voltage, described the
Two target voltages are the main board power supply of LED liquid crystal television.
3. power panel according to claim 2, which is characterized in that the power panel further include: voltage sampling unit and anti-
Present unit；
Wherein, the first input end of the voltage sampling unit is connected with the output end of the rectification unit, the voltage sample
Second input terminal of unit is connected with the second output terminal of the half-bridge resonance LLC transformer unit, the voltage sampling unit
Output end be connected with the input terminal of the feedback unit, the first target voltage for exporting to the rectification unit is adopted
Sample, and feedback voltage is generated according to sampled voltage, the feedback voltage is exported to the feedback unit；
The output end of the feedback unit is connected with the control chip, for the feedback voltage to be conveyed to the control core
Piece makes described so that the control chip controls the half-bridge resonance LLC transformer unit according to the feedback voltage
The change rate of the first target voltage of rectification unit output becomes smaller.
4. power panel according to claim 2, which is characterized in that the half-bridge resonance LLC transformer unit includes: first
Switching tube, second switch, first capacitor, primary winding and constant current input secondary windings；
Wherein, the second end of the first switch tube is connected with external input power, the pin of first end and the control chip
It is connected, third end is connected with the second end of the first end of primary winding and second switch respectively；
The first end of the second switch is connected with the pin of the control chip, third end ground connection and while with described first
The first end of capacitor is connected, and the second end of the first capacitor is connected with the second end of primary winding；
The constant current input secondary windings includes first group of coil and second group of coil, the second end of first group of coil and institute
The first end for stating second group of coil is connected, and the first end and second end of first group of coil is corresponding to export the first first object
Voltage, first end and second end second of first target voltage of corresponding output of second group of coil, first group of coil
First end and the second end of second group of coil corresponding export the third first target voltage.
5. power panel according to claim 4, which is characterized in that the output voltage selecting unit include first switch,
Second switch, third switch and the 4th switch,
Wherein, the first end of the first switch is connected with the first end of first group of coil, the second end of first switch with
The rectification unit is connected；
The first end of the second switch is connected with the second end of first group of coil, the second end of the second switch and institute
Rectification unit is stated to be connected；
The first end of the third switch is connected with the first end of second group of coil, the second end of the third switch and institute
Rectification unit is stated to be connected；
The first end of 4th switch is connected with the second end of second group of coil, the second end of the 4th switch and institute
Rectification unit is stated to be connected.
6. power panel according to claim 5, which is characterized in that the rectification unit includes the 5th diode, the six or two
Pole pipe, the 7th diode and the 8th diode, wherein the 5th diode and the 7th Diode series, the described 6th
Diode and the 8th Diode series, the 6th diode and the 8th diode composition series arm with it is described
The series arm of 5th diode and the 7th diode composition is in parallel, and the anode of the 5th diode is opened with described first
The second end of pass and the second end of the second switch are connected, and the of the cathode of the 8th diode and third switch
The second end of two ends and the 4th switch is connected.
7. power panel according to claim 6, which is characterized in that the half-bridge resonance LLC transformer unit further include: main
Plate power supply secondary windings, the main board power supply secondary windings and the primary winding incude, and generate the second target voltage,
Think the main board power supply of LED liquid crystal television.
8. power panel according to claim 7, which is characterized in that the voltage sampling unit includes: the 5th resistance, the 6th
Resistance, the 7th resistance, the 8th resistance and third switching tube,
Wherein, one end of the 5th resistance is connected with the cathode of the 6th diode, and the other end passes through the 6th resistance eutral grounding,
The other end of 5th resistance is also connected with the first end of the third switching tube, the third end of the third switching tube and institute
The one end for stating main board power supply secondary windings is connected, and the second end of the third switching tube is connected with one end of the 7th resistance,
The other end of 7th resistance is grounded, and one end of the 8th resistance is connected with the second end of the third switching tube, another
End is connected with feedback unit.
9. a kind of TV, which is characterized in that the TV includes power panel described in any one of the claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811113750.4A CN109151351B (en) | 2018-09-25 | 2018-09-25 | Power panel and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811113750.4A CN109151351B (en) | 2018-09-25 | 2018-09-25 | Power panel and television |
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| Publication Number | Publication Date |
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| CN109151351A true CN109151351A (en) | 2019-01-04 |
| CN109151351B CN109151351B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811113750.4A Active CN109151351B (en) | 2018-09-25 | 2018-09-25 | Power panel and television |
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| CN (1) | CN109151351B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111315076A (en) * | 2020-03-24 | 2020-06-19 | 深圳创维－Rgb电子有限公司 | LED power supply system and device |
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| CN109151351B (en) | 2021-06-01 |
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