CN107317481A - A kind of multistage DC DC converters, supply unit and display device - Google Patents
A kind of multistage DC DC converters, supply unit and display device Download PDFInfo
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- CN107317481A CN107317481A CN201710741322.5A CN201710741322A CN107317481A CN 107317481 A CN107317481 A CN 107317481A CN 201710741322 A CN201710741322 A CN 201710741322A CN 107317481 A CN107317481 A CN 107317481A
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- voltage
- resistance
- multistage
- subelement
- transformation module
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a kind of multistage DC DC converters, supply unit and display device, wherein, the multistage DC DC converters are connected with power supply changeover device and back light, and it includes the voltage transformation module of N grades of series connection, and N is more than or equal to 2；The DC voltage of power supply changeover device output is received by first order voltage transformation module, and be converted into first voltage and export to second level voltage transformation module, continue to carry out voltage conversion to the first voltage by second level voltage transformation module and export second voltage, by that analogy, control is carried out after voltage conversion successively per voltage order one modular converter, the default supply voltage of N step voltages modular converter output to back light.The output voltage of DC DC converters can be adjusted flexibly by voltage conversion step by step, to meet the voltage specification requirement of different backlights, improve the compatibility of supply unit, effectively increase the production test efficiency of display module.
Description
Technical field
The present invention relates to appliances power source technical field, more particularly to a kind of multistage dc-dc, supply unit and display
Equipment.
Background technology
It is well known that LCD screen in itself will not light, it is necessary to which other light emitting sources light, and LED light emitting sources are liquid crystal
TV and a kind of light sources the most extensive of Ying Yu in liquid crystal display.Conventional LED liquid crystal backlights power source design uses such as Fig. 1 at present
Mode, convert alternating current to the DC voltage of certain specification by power supply changeover device, then pass through boost DC-DC converter will
Direct current rises to voltage needed for backlight.This mode the disadvantage is that, boost DC-DC can be limited by switching tube dutycycle, i.e.,
Output voltage and input voltage ratio are limited by, if boost DC-DC switching tube dutycycle is excessive, power supply conversion efficiency can be caused
Low, switching tube caloric value super large makes the thermal design of switching tube into difficult point, will have a strong impact on the power supply product life-span, brought to design
Puzzlement.
Therefore, it is often according to the voltage specification of backlight, power converter design one is rational to solve this problem
Output voltage, to meet the performance requirement of boost DC-DC.But, this mode can cause the different power supply of different screen needs, make
Wide in variety into power supply, such as LED backlight is different because of size, and backlight placement location is different, there is different voltage specifications respectively,
Lie prostrate more, lied prostrate up to 100 more as little as ten.It can be seen that existing backlight electric power scheme can not the voltage specifications of compatible different backlights will
Ask, cause the value volume and range of product of supply unit excessive, largely have impact on the production test efficiency of display module.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of multistage dc-dc, electricity
Source device and display device, the output voltage of dc-dc can be adjusted flexibly by voltage conversion step by step, to meet the different back ofs the body
The voltage specification requirement of light source, improves the compatibility of supply unit, effectively increases the production test efficiency of display module.
In order to achieve the above object, this invention takes following technical scheme：
A kind of multistage dc-dc, is connected with power supply changeover device and back light, and it includes the voltage conversion mould of N grades of series connection
Block, N is more than or equal to 2；The DC voltage of power supply changeover device output is received by first order voltage transformation module, and is converted into the
One voltage output is continued to carry out voltage to the first voltage to second level voltage transformation module by second level voltage transformation module
Change and export second voltage, by that analogy, control is carried out after voltage conversion successively per voltage order one modular converter, N grades of electricity
The default supply voltage of modular converter output is pressed to back light.
In described multistage dc-dc, each voltage transformation module includes boosting unit and voltage regulation unit,
The voltage regulation unit exports corresponding feedback signal to boosting unit according to the voltage-regulation instruction received, the boosting
Unit receives the A-1 voltages of upper level voltage transformation module output, and is by A-1 voltage conversions according to the feedback signal
Exported after A voltages to next stage voltage transformation module；Wherein, A is the series of current voltage modular converter.
In described multistage dc-dc, when A is equal to 1, the boosting unit receives the straight of power supply changeover device output
Voltage is flowed, and the DC voltage is converted to according to the feedback signal exported after first voltage to second level voltage conversion mould
Block；
When A is equal to N, the boosting unit receives the N-1 voltages of N-1 step voltages modular converter output, and according to described
The N-1 voltages are to back light after default supply voltage is exported by feedback signal.
In described multistage dc-dc, the voltage regulation unit includes resistance and sets subelement, sampling feedback
Unit and several switch subelements, each switch subelement are switched on or off according to the voltage-regulation instruction received, adjusted
Resistance sets the resistance of subelement, and the sampling feedback subelement sets the resistance of subelement to export corresponding according to current resistance
Feedback signal is to boosting unit.
In described multistage dc-dc, each switch subelement includes first resistor, second resistance and three poles
Pipe, one end connection voltage-regulation command input of the first resistor, the other end connecting triode of the first resistor
One end of base stage and second resistance；The emitter stage and ground of the other end connecting triode of the second resistance；The triode
Colelctor electrode connects the resistance and sets subelement.
In described multistage dc-dc, the resistance set subelement include resistance to earth and several quantity and
Switch the equal 3rd resistor of the quantity of subelement, one end of one end connection resistance to earth of all 3rd resistors and sampling feedback
Subelement, one switch subelement of other end correspondence connection of all 3rd resistors.
In described multistage dc-dc, the sampling feedback subelement includes sampling resistor, the sampling resistor
One end connection resistance sets subelement, and the other end of the sampling resistor connects the feedback end of boosting unit.
In described multistage dc-dc, the triode is NPN type triode.
It is provided with a kind of supply unit, including shell, the shell on pcb board, the pcb board and is provided with Power convert
Device and multistage dc-dc as described above, direct voltage output is converted to extremely by power supply changeover device by AC-input voltage
Multistage dc-dc, the multistage dc-dc carries out exporting default power supply electricity after voltage conversion step by step to DC voltage
It is depressed into back light.
A kind of display device, including back light, it also includes supply unit as described above, is by the supply unit
Back light is powered.
It is described in the multistage dc-dc, supply unit and the display device that are provided compared to prior art, the present invention
Multistage dc-dc is connected with power supply changeover device and back light, it include N grades series connection voltage transformation modules, N be more than etc.
In 2；The DC voltage of power supply changeover device output is received by first order voltage transformation module, and is converted into first voltage output
To second level voltage transformation module, continued to carry out the first voltage voltage conversion and exported by second level voltage transformation module
Second voltage, by that analogy, control are carried out after voltage conversion successively per voltage order one modular converter, N step voltage modular converters
Output presets supply voltage to back light.The output voltage of dc-dc can be adjusted flexibly by voltage conversion step by step, with
The voltage specification requirement of different backlights is met, the compatibility of supply unit is improved, the production for effectively increasing display module is surveyed
Try efficiency.
Brief description of the drawings
Fig. 1 is the structured flowchart of supply unit in the prior art；
The structured flowchart for the supply unit that Fig. 2 provides for the present invention；
The structured flowchart for the multistage dc-dc that Fig. 3 provides for the present invention;
The circuit diagram for the multistage dc-dc that Fig. 4 provides for the present invention.
Embodiment
The present invention provides a kind of multistage dc-dc, supply unit and display device, can spirit by voltage conversion step by step
The output voltage of adjustment dc-dc living, to meet the voltage specification requirement of different backlights, improves the compatibility of supply unit
Property, effectively increase the production test efficiency of display module.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
Referring to Fig. 2, the supply unit that the present invention is provided includes shell（Not shown in figure）, it is provided with the shell
Pcb board（Not shown in figure）, power supply changeover device 10 and multistage dc-dc 20, the multistage are provided with the pcb board
Dc-dc 20 is connected with power supply changeover device 10 and back light, is converted to AC-input voltage by power supply changeover device 10
Direct voltage output is to multistage dc-dc 20, and the multistage dc-dc 20 carries out voltage step by step to DC voltage and turned
Default supply voltage is exported after changing to back light, so as to be embodied as the normal power supply of back light.
Wherein, the multistage dc-dc 20 includes the voltage transformation module 21 of N grades of series connection, and N is more than or equal to 2, i.e., more
At least include the voltage transformation module 21 of two series connection in level dc-dc 20, can be according to specific input voltage and output
Voltage requirements adjust the quantity of voltage transformation module 21, when carrying out voltage conversion, are received by first order voltage transformation module 21
The DC voltage that power supply changeover device 10 is exported, and be converted into first voltage and export to second level voltage transformation module 21, the
Two voltage transformation modules 21, which are received, to be proceeded voltage conversion and exports second voltage after the first voltage, by that analogy,
Control is carried out after voltage conversion successively per voltage order one modular converter 21, makes the default power supply of the output of N step voltages modular converter 21
Voltage is to back light.The present invention by using voltage conversion step by step pattern, it is defeated due to every voltage order one modular converter 21
Going out voltage can flexibly be set, therefore can be by setting the output voltage and voltage of every voltage order one modular converter 21 to turn respectively
The quantity of mold changing block 21 reaches the purpose of output different power voltage so that a power supply changeover device 10 just adapts to multiple voltage
The back light of specification requirement, the power supply changeover device 10 without specially designing specific output voltage for every kind of back light, significantly
The compatibility of supply unit is improved, and has saved production test cost.
Specifically, also referring to Fig. 3, in the multistage dc-dc 20, each voltage transformation module 21 includes
Boosting unit 211 and voltage regulation unit 212, all boosting units 211 are sequentially connected in series, and each correspondence of boosting unit 211 connects
A voltage regulation unit 212 is connect, i.e., each voltage transformation module 21 can set regulation to rise by voltage regulation unit 212
The output voltage of unit 211 is pressed, the specific voltage regulation unit 212 is corresponding according to the voltage-regulation instruction output received
Feedback signal to boosting unit 211, the boosting unit 211 receives the A-1 voltages of the output of upper level voltage transformation module 21,
And according to the feedback signal by A-1 voltage conversions be A voltages after export to next stage voltage transformation module 21；Wherein, A
For the series of current voltage modular converter 21.Such as boosting unit 211 in second level voltage module receives first order voltage-mode
The first voltage that boosting unit 211 is exported in block, and the first voltage is converted to the by the feedback signal received according to it
The boosting unit 211 into third level voltage transformation module 21 is exported after two voltages, proceeds voltage conversion processing.
Especially, when A is equal to 1, the boosting unit 211 receives the DC voltage that power supply changeover device 10 is exported, and root
The DC voltage is converted to according to the feedback signal and exported after first voltage to second level voltage transformation module 21；I.e. first
Boosting unit 211 in step voltage modular converter 21 will receive the DC voltage that power supply changeover device 10 is exported, and according to the first order
The feedback signal that voltage regulation unit 212 in voltage transformation module 21 is exported is converted to the DC voltage after first voltage
Export to second level voltage transformation module 21.
And when A is equal to N, the boosting unit 211 receives the N-1 voltages of the output of N-1 step voltages modular converter 21,
And be to back light after default supply voltage is exported by the N-1 voltages according to the feedback signal；That is afterbody,
Boosting unit 211 in N step voltages modular converter 21 will receive boosting unit 211 in N-1 step voltages modular converter 21 and export
N-1 voltages, and the feedback signal that exports of voltage regulation unit 212 in N-1 step voltages modular converter 21 is by institute
It is to back light after default supply voltage is exported to state N-1 voltages.
In the multistage dc-dc 20 that the present invention is provided, voltage-regulation is passed through in every voltage order one modular converter 21
Unit 212 adjusts the output voltage of boosting unit 211 to set, and can flexibly send electricity according to the voltage specification of current backlight light source
Regulating command is pressed to each voltage regulation unit 212 so that the default supply voltage of multistage dc-dc 20 meets current
Voltage specification requirement, is effectively saved power type and quantity, when carrying out backlight source module detection, without frequently changing survey
Supply unit is tried, production test efficiency is effectively increased.
Further, also referring to Fig. 4, in the present embodiment, it is explained with two-stage voltage transformation module 21, can
With understanding, in other embodiments, the quantity of voltage transformation module 21 can be increased according to voltage requirements correspondence.
Wherein described boosting unit 211 specifically includes DC-DC control chips and peripheral operating circuit, because it is existing
Ripe application circuit, the present invention is repeated no more to its annexation and the course of work, in the present embodiment, and the DC-DC controls core
Piece can use the PF7900S of model such as Li Lin companies, the LM3478 of TI companies, LM3486, the NCV8870 of ON companies etc. to boost
Control chip, certainly, in other embodiments, can also use other control chips with identical function, it is of the invention to this
It is not construed as limiting.
Because each DC-DC control chips have the feedback network of a setting output voltage, i.e. FB feedback networks, pass through
This feedback network can set output voltage, therefore the present invention realizes that boosting unit 211 exports electricity by adjusting feedback signal
The regulation of pressure, if the specific voltage regulation unit 212 include resistance set subelement 2121, sampling feedback subelement 2122 and
Dry switch subelement 2123, wherein several switch subelements 2123 are all connected with resistance and set subelement 2121, and each open
Climax unit 2123 is all connected with corresponding voltage-regulation command input, described to set son single using feedback subelement connection resistance
The feedback pin of member 2121 and DC-DC control chips, i.e. FB_1 pin and FB_2 pin.Each switch subelement 2123 is according to receiving
Voltage-regulation instruction is switched on or off, so as to adjust the resistance that resistance sets subelement 2121, sampling feedback is single afterwards
Member 2122 sets the resistance of subelement 2121 to export corresponding feedback signal to boosting unit 211 according to current resistance.
Change the output voltage of boosting unit 211 by adjusting the resistance over the ground in feedback network in the present invention, have
Body can set the resistance of subelement 2121 to carry out by individually controlling being switched on or off for each switch subelement 2123 to resistance
It is adjusted flexibly, the sampling of sampling feedback subelement 2122 is obtained corresponding feedback signal and is exported to DC-DC control chips, and then
So that boosting unit 211 exports corresponding voltage, the regulation of output voltage is realized.Regulative mode is versatile and flexible, so as to be suitable for
The voltage requirements of different back lights, improve the scope of application of supply unit.
Specifically, each switch subelement 2123 includes first resistor R1, second resistance R2 and triode Q1, and described the
One resistance R1 one end connection voltage-regulation command input, the other end connecting triode Q1 of first resistor R1 base stage
With second resistance R2 one end；The other end connecting triode Q1 of second resistance R2 emitter stage and ground；The triode
Q1 colelctor electrode connects the resistance and sets subelement 2121.In the present embodiment, the triode Q1 is NPN type triode Q1.
As shown in figure 4, the base stage of the triode Q1 in each switch subelement 2123 individually connects a voltage-regulation command input,
The corresponding switch-mode regulation signal of individual reception, it is each independent to open as shown in ON/OFF-1, ON/OFF-2 and ON/OFF-n in figure
Close Regulate signal to input to triode Q1 base stage after first resistor R1 and second resistance R2 partial pressures, individually adjust each three
Pole pipe Q1 on or off, and then flexible modulation resistance sets the resistance of subelement 2121.
Further, the resistance sets subelement 2121 to include resistance to earth R0 and several quantity and switch subelement
2123 quantity equal 3rd resistor R3, all 3rd resistor R3 one end connection resistance to earth R0 one end and sampling feedback
Subelement 2122, all 3rd resistor R3 one switch subelement 2123 of other end correspondence connection, specially corresponds to connection three
Pole pipe Q1 colelctor electrode.In i.e. described voltage regulation unit 212, all 3rd resistor R3 and resistance to earth R0 are parallel with one another, and
Each triode Q1 colelctor electrode corresponds to one 3rd resistor R3 of connection, by the on or off for controlling each triode Q1
To control whether connected 3rd resistor R3 accesses circuit, so that adjust the resistance that resistance sets subelement 2121, i.e., it is anti-
The resistance over the ground of network is presented, the purpose for changing output voltage is reached.
Further, the sampling feedback subelement 2122 includes sampling resistor Rs, one end of the sampling resistor Rs
Connect resistance and subelement 2121 is set, specific connection resistance to earth R0 one end, the other end connection of the sampling resistor Rs rises
The feedback end of unit 211 is pressed, the quantity of the 3rd resistor R3 in access circuit is provided with is logical so as to after adjusting resistance over the ground
Cross the sampling resistor Rs to be gathered according to current resistance over the ground and feed back corresponding feedback signal to boosting unit 211, specifically
Feedback voltage signal is gathered to boosting unit 211, boosting unit 211 exports corresponding voltage according to the feedback signal, realizes
The regulation of output voltage.
Based on above-mentioned supply unit, the present invention correspondingly provides a kind of multistage dc-dc, due to above to described
Multistage dc-dc is described in detail, and is not described further herein.
Based on above-mentioned supply unit, the present invention correspondingly provides a kind of display device, including back light and as described above
Supply unit, due to the supply unit being described in detail above, be not described further herein.
To more fully understand the voltage-regulation process for the multistage dc-dc that the present invention is provided, below in conjunction with Fig. 4, lift
Application Example is illustrated to the voltage-regulation process of the multistage dc-dc：
As shown in figure 4, the base stage of each triode individually connects a voltage-regulation instruction input in two-stage voltage transformation module
End, the corresponding switch-mode regulation signal of individual reception, as shown in ON/OFF-1, ON/OFF-2 and ON/OFF-n in figure, and each three
The colelctor electrode of pole pipe corresponds to one 3rd resistor of connection, and all 3rd resistors and resistance to earth are parallel with one another.In regulation output
During voltage, each triode receiving voltage regulating command, i.e. switch-mode regulation signal, such as ON/OFF-1 and ON/OFF-2 inputs are high
Level signal, the equal input low level signal of remaining voltage-regulation command input is then now believed with ON/OFF-1 and ON/OFF-2
The triode ON of number end connection, remaining triode is turned off, make resistance set in subelement two 3rd resistors with it is electric over the ground
Resistance is in parallel, and then obtains the current resistance over the ground of two-stage voltage transformation module, i.e., FB-1-1 and FB-2-2 lower inclined resistance in figure,
Sampling resistor gathers corresponding feedback voltage and feeds back to DC-DC control chips, so as to adjust the output voltage of boosting unit, reaches
To the effect for changing output voltage.
It is specific then to control resistance reduction over the ground when needing to improve output voltage, can be using more 3rd resistors in parallel
Mode, or selected, during with reduction output voltage should be needed, then controlled according to the resistance of the 3rd resistor of different branch
Resistance increases system over the ground, and correspondence can be electric using by the way of reducing 3rd resistor quantity in parallel, or according to the 3rd of different branch
The resistance of resistance is selected, and can specifically be selected according to the actual requirements.
In summary, in the present invention is provided multistage dc-dc, supply unit and display device, the multistage DC-
DC converters are connected with power supply changeover device and back light, and it includes the voltage transformation module of N grades of series connection, and N is more than or equal to 2；By
First order voltage transformation module receives the DC voltage of power supply changeover device output, and is converted into first voltage and exports to second
Step voltage modular converter, is continued to carry out the first voltage voltage conversion and exports the second electricity by second level voltage transformation module
Pressure, by that analogy, control are carried out after voltage conversion successively per voltage order one modular converter, and the output of N step voltages modular converter is pre-
If supply voltage is to back light.The output voltage of dc-dc can be adjusted flexibly by voltage conversion step by step, to meet not
With the voltage specification requirement of backlight, the compatibility of supply unit is improved, the production test efficiency of display module is effectively increased.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (10)
1. a kind of multistage dc-dc, is connected with power supply changeover device and back light, it is characterised in that connected including N grades
Voltage transformation module, N is more than or equal to 2；The DC voltage of power supply changeover device output is received by first order voltage transformation module, and will
It is converted to first voltage and exported to second level voltage transformation module, is continued by second level voltage transformation module to the described first electricity
Pressure carries out voltage conversion and exports second voltage, by that analogy, and control carries out voltage conversion successively per voltage order one modular converter
Afterwards, the output of N step voltages modular converter presets supply voltage to back light.
2. multistage dc-dc according to claim 1, it is characterised in that each voltage transformation module includes rising
Unit and voltage regulation unit are pressed, the voltage regulation unit exports corresponding feedback letter according to the voltage-regulation instruction received
Number to boosting unit, the boosting unit receives the A-1 voltages of upper level voltage transformation module output, and according to the feedback
Signal by A-1 voltage conversions be A voltages after export to next stage voltage transformation module；Wherein, A is current voltage modulus of conversion
The series of block.
3. multistage dc-dc according to claim 2, it is characterised in that
When A is equal to 1, the boosting unit receives the DC voltage of power supply changeover device output, and will according to the feedback signal
The DC voltage, which is converted to, to be exported after first voltage to second level voltage transformation module；
When A is equal to N, the boosting unit receives the N-1 voltages of N-1 step voltages modular converter output, and according to described
The N-1 voltages are to back light after default supply voltage is exported by feedback signal.
4. multistage dc-dc according to claim 2, it is characterised in that the voltage regulation unit includes resistance
Subelement, sampling feedback subelement and several switch subelements are set, and each switch subelement is adjusted according to the voltage received
Section instruction is switched on or off, and regulation resistance sets the resistance of subelement, and the sampling feedback subelement is set according to current resistance
The resistance of subelement exports corresponding feedback signal to boosting unit.
5. multistage dc-dc according to claim 4, it is characterised in that each switch subelement includes first
Resistance, second resistance and triode, one end connection voltage-regulation command input of the first resistor, the first resistor
The base stage of other end connecting triode and one end of second resistance；The emitter stage of the other end connecting triode of the second resistance
And ground；The colelctor electrode of the triode connects the resistance and sets subelement.
6. multistage dc-dc according to claim 4, it is characterised in that the resistance sets subelement to include pair
The ground resistance 3rd resistor equal with the quantity for switching subelement with several quantity, one end connection of all 3rd resistors is over the ground
One end of resistance and sampling feedback subelement, one switch subelement of other end correspondence connection of all 3rd resistors.
7. multistage dc-dc according to claim 4, it is characterised in that the sampling feedback subelement includes adopting
Sample resistance, one end connection resistance of the sampling resistor sets subelement, the other end connection boosting unit of the sampling resistor
Feedback end.
8. multistage dc-dc according to claim 5, it is characterised in that the triode is NPN type triode.
9. it is provided with a kind of supply unit, including shell, the shell on pcb board, the pcb board and is provided with Power convert
Device, it is characterised in that the multistage dc-dc as described in claim 1-8 any one is additionally provided with the pcb board,
AC-input voltage is converted into direct voltage output to multistage dc-dc by power supply changeover device, the multistage DC-DC turns
Parallel operation carries out exporting default supply voltage after voltage conversion step by step to back light to DC voltage.
10. a kind of display device, including back light, it is characterised in that also including supply unit as claimed in claim 9,
Powered by the supply unit for back light.
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| CN201710741322.5A CN107317481B (en) | 2017-08-25 | 2017-08-25 | Multi-stage DC-DC converter, power supply device and display equipment |
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| CN107317481B CN107317481B (en) | 2020-02-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107888072A (en) * | 2017-12-14 | 2018-04-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Appliances power source control device and control method |
| CN109949753A (en) * | 2019-04-24 | 2019-06-28 | 深圳创维－Rgb电子有限公司 | A kind of power supply unit of backlight |
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| CN102055328A (en) * | 2009-10-30 | 2011-05-11 | 三星电机株式会社 | Multi-stage power supply |
| JP2016158385A (en) * | 2015-02-24 | 2016-09-01 | コニカミノルタ株式会社 | Power supply controller and image forming apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888072A (en) * | 2017-12-14 | 2018-04-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Appliances power source control device and control method |
| CN109949753A (en) * | 2019-04-24 | 2019-06-28 | 深圳创维－Rgb电子有限公司 | A kind of power supply unit of backlight |
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| CN107317481B (en) | 2020-02-07 |
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