CN106612579A - A light emitting diode driving module and a light emitting diode module - Google Patents
A light emitting diode driving module and a light emitting diode module Download PDFInfo
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- CN106612579A CN106612579A CN201510686602.1A CN201510686602A CN106612579A CN 106612579 A CN106612579 A CN 106612579A CN 201510686602 A CN201510686602 A CN 201510686602A CN 106612579 A CN106612579 A CN 106612579A
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Abstract
The embodiment of the invention provides a light emitting diode driving module used for driving a plurality of light emitting diode strings, and the light emitting diode driving module comprises a division circuit, an error amplification circuit and a driving circuit. The division circuit makes a fixed voltage be divided by a first voltage related to an input voltage to generate a reference voltage. The error amplification circuit is electrically connected to the division circuit to receive the reference voltage and hereby generate a driving voltage. The driving circuit is electrically connected to the error amplification circuit so as to receive the driving voltage and to selectively enable conduction between the plurality of light emitting diode strings according to the driving voltage. The amplification circuit forms a negative feedback path with the driving circuit so that the input power corresponding to the input voltage is a fixed value.
Description
Technical field
The present invention with regard to a kind of light-emitting diodes body drive module for driving multiple light emitting diode strings with
Light-emitting diode (LED) module, and particularly a kind of light-emitting diodes body drive module for determining input power with it is luminous
Diode (led) module.
Background technology
Light emitting diode by volume production, and can have been brought and used as illumination at present.Multiple light-emitting diodes
Pipe can be concatenated into more than one light emitting diode string, and by drive circuit, light emitting diode string
Can be lighted by driving.At present the design of drive circuit is more with linear drive circuit as main flow, and it has
Low cost, low EMI, make and undersized advantage when being easy to.
Figure 1A is refer to, Figure 1A is the schematic diagram of conventional light emitting diodes module.Conventional light emitting diodes
Module 1 includes multiple light emitting diode string LEDS1, LEDS2 and drive circuit 11.Each lights
Diode string LEDS1, LEDS2 include at least one light emitting diode, and have forward electric conduction respectively
Pressure Vf1With Vf2.Drive circuit 11 is a linear drive circuit for determining electric current driving, be that includes multiple
Switch and at least one constant current source, and it is electrically connected with the input of light emitting diode string LEDS1, LEDS2
End and outfan, with according to the input voltage V of exchangeinOptionally allow light emitting diode string LEDS1,
One of LEDS2 is turned on.
Referring to Figure 1A and Figure 1B, Figure 1B be conventional light emitting diodes module input voltage,
Flow through the electric current of light emitting diode string and the oscillogram of total current.As shown in Figure 1B, when the input electricity of exchange
Pressure VinMore than forward conducting voltage V of light emitting diode string LEDS1f1But less than light emitting diode string
Forward conducting voltage V of LEDS2f2When, then light emitting diode string LEDS1 can be turned on, and light-emitting diodes
Pipe string LEDS2 is not turned on, that is, in input voltage VinBetween forward conducting voltage Vf1With Vf2Between
When, have electric current ID1Flow through light emitting diode string LEDS1.As the input voltage V of exchangeinIt is more than or equal to
Forward conducting voltage V of light emitting diode string LEDS2f2When, by drive circuit 11, selection only allows to be sent out
Optical diode string LEDS2 is turned on, that is, in input voltage VinMore than or equal to forward conducting voltage Vf2
When, have electric current ID2Flow through light emitting diode string LEDS2.
In addition, for supply input voltage VinDriving power supply for, its supply total current be ILED,
Total current ILEDFor electric current ID1With ID2Summation, and light emitting diode string LEDS1, LEDS2 consumed
General power be ID1·Vf1(equivalent to the area of region R1a and R1b) and ID2·Vf2(equivalent to region R2
Area) summation.As can be seen here, when forward conducting voltage Vf1With Vf2It is higher, then have in theory compared with
Few power consumption, but its power factor (Power Factor, PF) also can be relatively low；On the contrary, ought be forward
Conducting voltage Vf1With Vf2It is lower, then larger power consumption is had in theory, but its power factor also can
It is higher.
In addition, the input voltage V to exchangeinAlthough as the linear drive circuit 11 of driving power supply
Framework is simple, but because light emitting diode string LEDS1, LEDS2 are to determine electric current driving, therefore, one
Denier input voltage VinIt is varied from, then input power also can and then change.Even, in input voltage Vin
During rising, unnecessary power can be consumed on drive circuit 11 so that the temperature of drive circuit 11 is significantly
Rise, cause drive circuit 11 overheated or damage.Still further aspect, due to each light emitting diode string
Forward conducting voltage V of LEDS1, LEDS2f1、Vf2Difference, therefore when input power has variation, respectively
The power that light emitting diode string LEDS1, LEDS2 are obtained also can be different.
The content of the invention
The embodiment of the present invention provides a kind of LED driving module, and it is to drive multiple light-emitting diodes
Pipe string, and including division circuit, error amplifying circuit and drive circuit.Division circuit removes fixed voltage
To be relevant to the first voltage of input voltage, to produce reference voltage.Error amplifying circuit is electrically connected with and removes
Method circuit, to receive reference voltage, and produces accordingly driving voltage.Drive circuit is electrically connected with and misses
Difference amplifying circuit, to receive driving voltage, to make multiple light emitting diodes according to driving voltage selectivity
String conducting.Division circuit, error amplifying circuit and drive circuit form negative feedback paths, so as to correspond to
The input power of input voltage is fixed value.
The embodiment of the present invention provides a kind of LED driving module, and it is to drive multiple light-emitting diodes
Pipe string, and including mlultiplying circuit, error amplifying circuit and drive circuit.Mlultiplying circuit will be relevant to input
The first voltage of voltage with to receive the multiple electric currents flow through when multiple light emitting diode strings are forward turned on
An at least one ohmically at least voltage is multiplied, to produce reference voltage.Error amplifying circuit is electrically connected with
Mlultiplying circuit, to receive reference voltage and fixed voltage, and produces accordingly driving voltage.Drive electricity
Road is electrically connected with error amplifying circuit, many to be made according to driving voltage selectivity to receive driving voltage
Individual light emitting diode string conducting.Mlultiplying circuit, error amplifying circuit and drive circuit form negative feedback paths,
So as to be fixed value corresponding to the input power of input voltage.
To enable the feature and technology contents that are further understood that the present invention, refer to below in connection with the present invention
Detailed description and accompanying drawing, but these explanations are only used for illustrating the present invention with accompanying drawing, rather than to the present invention
Interest field make any restriction.
Description of the drawings
Figure 1A is the schematic diagram of conventional light emitting diodes module.
Figure 1B be conventional light emitting diodes module input voltage, flow through the electric current of light emitting diode string with it is total
The oscillogram of electric current.
Fig. 2A is the schematic diagram of the light-emitting diode (LED) module of the embodiment of the present invention.
Fig. 2 B are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 3 A are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 3 B are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 3 C are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 3 D are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 4 A are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 4 B are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 4 C are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
Symbol description
1：Conventional light emitting diodes module
11、311、321、331、411、421、431：Drive circuit
LEDS1、LEDS2、LEDS：Light emitting diode string
Vf1、Vf2、Vf：Forward conducting voltage
Vin：Input voltage
ID1、ID2、ILED：Electric current
R1a、R1b、R2：Region
21、22、31、32、33、41、42、43：Light-emitting diode (LED) module
211、DIV：Divider
OP, OP1～OP3：Operational amplifier
MN1、MN2：Switching transistor
R1～R11：Resistance
C：Fixed voltage
Vref：Reference voltage
VS、V3、V4：Voltage
221、MUL：Multiplier
C1、C2：Electric capacity
313、323、333：Division circuit
312、322、332、412、422、432：Error amplifying circuit
413、423、433：Mlultiplying circuit
Vin,avg：Average input voltage
Specific embodiment
Various exemplary embodiments will be more fully described referring to accompanying drawing below, be shown in the accompanying drawings
Exemplary embodiments.However, concept of the present invention may embody in many different forms, and should not explain
Be limited the exemplary embodiments for being illustrated in this article.Specifically, there is provided these exemplary embodiments make
It will be detailed and complete to obtain of the invention, and will fully pass on concept of the present invention to those skilled in the art
Category.In all accompanying drawings, the size and relative size in Ceng He areas can be lavished praise on oneself in order to understand.Similar numeral
All the time similar component is indicated.
For a user, its brightness seen is relevant to the input power of LED driving module,
Therefore in order to avoid causing input power also can and then change because input voltage is changed, the embodiment of the present invention
A kind of LED driving module and light-emitting diode (LED) module for determining input power is provided, that is, no matter
Why are the forward conducting voltage of light emitting diode string or total current, and its input power is fixed value.Other one
Aspect, because light-emitting diode (LED) module has input power is determined, and will not be risen with input voltage, therefore is disappeared
Power of the consumption on the chip of LED driving module, also will not increase with input voltage, with
Avoid chip overheating or the damage of LED driving module.
First, Fig. 2A is refer to, Fig. 2A is the schematic diagram of the light-emitting diode (LED) module of the embodiment of the present invention.
Light-emitting diode (LED) module 21 includes light emitting diode string LEDS, a divider 211, operational amplifier
OP, switching transistor MN1 and resistance R3, wherein divider 211, operational amplifier OP, switching be brilliant
Body pipe MN1 and resistance R3The LED driving module of composition light-emitting diode (LED) module 21.Luminous two
Pole pipe string LEDS includes at least one light emitting diode, with forward conducting voltage Vf, its input termination
Receive input voltage Vin, and its outfan is electrically connected with the drain electrode of switching transistor MN1.Divider 211
Receives input voltage VinWith fixed voltage C, and its outfan electric property coupling operational amplifier OP's is just defeated
Enter end.The negative input end electric property coupling resistance R of operational amplifier OP3One end and switching transistor MN1
Source electrode, the grid of the outfan electric property coupling switching transistor MN1 of operational amplifier OP, and resistance
R3The other end ground connection.
In this embodiment, divider 211 is to output reference voltage Vref, wherein reference voltage Vref
For fixed voltage C and input voltage VinRatio, that is, Vref=C/Vin.Due to there is negative feedback road
Footpath, therefore, the voltage V on the negative input end of operational amplifier OPSOperational amplifier OP can be equal to
Reference voltage V on positive input terminalref.Then, input voltage VinDriving power supply provide flow through it is luminous
The electric current I of diode string LEDSLEDVoltage V can be equal toSWith resistance R3Ratio, that is, ILED=VS/R3。
Thus, input power PinCan be Vin·ILED=Vin·VS/R3, by voltage VSWith C/VinAbove formula is substituted into, then
Input power PinWill be equal to C/R3, that is, input power PinFor fixed value.
In addition, the above-mentioned light-emitting diode (LED) module 21 for determining input power and its LED driving module
The practice is only the one of which implementation of the present invention, and input power is determined in another kind of realization described below
The practice of light-emitting diode (LED) module and its LED driving module.
Fig. 2 B are refer to, Fig. 2 B are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
In the light-emitting diode (LED) module 22 of Fig. 2 B, the LED driving module of light-emitting diode (LED) module 22
Divider 211 during multiplier 221 is used instead to replace Fig. 2A embodiments, operational amplifier OP's is negative defeated
Enter end to make the outfan of electric property coupling multiplier 211 into respectively with positive input terminal and receive fixed voltage C,
And one of input electric property coupling resistance R of multiplier 2213One end.
In this embodiment, multiplier 221 is to output reference voltage Vref, wherein reference voltage Vref
For voltage VSWith input voltage VinProduct, that is, Vref=Vin·VS.Due to there are negative feedback paths,
Therefore, the reference voltage V on the negative input end of operational amplifier OPrefOperational amplifier OP can be equal to
Fixed voltage C on positive input terminal, that is, C=Vin·VS.Then, input voltage VinDriving power supply
The electric current I for flowing through light emitting diode string LEDS is providedLEDVoltage V can be equal toSWith resistance R3Ratio,
That is, ILED=VS/R3.Thus, input power PinCan be Vin·ILED=Vin·VS/R3, by voltage VSWith
C/VinAbove formula is substituted into, then input power PinWill be equal to C/R3, that is, input power PinFor fixed value.
The embodiment of above-mentioned Fig. 2A and Fig. 2 B is all relevant to the light-emitting diodes of an only light emitting diode string
Tube module and its LED driving module, however, the present invention is not intended to limit the number of light emitting diode string
Amount.Light-emitting diode (LED) module with plural light emitting diode string described below and its luminous two
Pole pipe drive module.
Fig. 3 A are refer to, Fig. 3 A are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
In this embodiment, light-emitting diode (LED) module 31 includes multiple light emitting diode string LEDS1, LEDS2
With LED driving module, LED driving module include drive circuit 311, error amplify
Circuit 312, division circuit 313, multiple resistance R1～R4With multiple electric capacity C1、C2.Light emitting diode
The input receives input voltage V of string LEDS1in, and the outfan of light emitting diode string LEDS1 is electrical
The input of coupling light emitting diode string LEDS2.The electric property coupling light emitting diode string of drive circuit 311
The outfan of LEDS1, LEDS2, error amplifying circuit 312, resistance R3、R4Two ends and electric capacity
C2One end.The electric property coupling division circuit 313 of error amplifying circuit 312, resistance R3、R4Two ends with
Electric capacity C2One end, and resistance R3、R4Another two ends and electric capacity C2The other end ground connection.Division circuit
313 receive fixed voltage C, and electric property coupling resistance R1The other end, resistance R2One end and electric capacity
C1One end.Resistance R1One end receives input voltage Vin, resistance R2The other end and electric capacity C1's
The other end is grounded.
In this embodiment, resistance R1、R2With electric capacity C1A low-pass filter circuit is constituted, its work
With similar to integrating circuit, therefore can be in electric capacity C1One end obtain input voltage VinAverage input electricity
Pressure Vin,avg.Division circuit 313 to by fixed voltage C divided by average input voltage Vin,avg, to obtain
Reference voltage Vref, wherein Vref=C/Vin,avg.Error amplifying circuit 312 is to receive reference voltage Vref
With resistance R3、R4Two ends on voltage, and accordingly outputting drive voltage to drive circuit 311.Drive
Circuit 311 according to driving voltage to cause light emitting diode string LEDS1, LEDS2 to be able to while forward
Conducting.The negative feedback paths constituted by error amplifying circuit 312 and drive circuit 311, resistance R3、
R4Two ends on the summation of voltage can be equal to reference voltage Vref.Work as R3Equal to R4When, flow through luminous two
The electric current of pole pipe string LEDS1, LEDS2 can be equal to Vref/R3, and input power can be equal to
Vin,avg·(Vref/R3), by above-mentioned reference voltage VrefWith C/Vin,avgAbove formula is substituted into, then input power can be equal to
C·(1/R3) fixed value.
Then, Fig. 3 B are refer to, Fig. 3 B are showing for the light-emitting diode (LED) module of another embodiment of the present invention
It is intended to.The light-emitting diode (LED) module 32 of Fig. 3 B is the one of which of the light-emitting diode (LED) module 31 of Fig. 3 A
Implementation.In the embodiment of Fig. 3 B, division circuit 323 includes a divider DIV, two
Input receives respectively fixed voltage C and average input voltage Vin,avg.Error amplifying circuit 312 includes
Operational amplifier OP1 and two resistance R5With R6, the positive input terminal electric property coupling of operational amplifier OP1
The outfan of divider DIV, to receive reference voltage Vref.The negative input end electricity of operational amplifier OP1
Property coupling resistance R5With R6Two ends, resistance R5With R6Another two ends difference electric property coupling resistance R3With
R4Another two ends, with make whereby operational amplifier OP1 negative input end receive resistance R3、R4Two ends
On voltage summation.
Drive circuit 321 includes two operational amplifier OP2, OP3, multiple resistance R7～R11With two
Switching transistor MN1, MN2.The positive input terminal electric property coupling resistance R of operational amplifier OP27One
End, electric capacity C2One end and operational amplifier OP1 outfan, and receive driving voltage.Operation amplifier
The negative input end electric property coupling resistance R of device OP28One end, and operational amplifier OP2 outfan electricity
Property coupling switching transistor MN2 grid.Resistance R8Other end electric property coupling switching transistor MN2
Source electrode, resistance R3、R10One end and resistance R5The other end.The drain electrode of switching transistor MN2
The outfan of electric property coupling light emitting diode string LEDS2.Resistance R7Other end electric property coupling resistance R9
One end and operational amplifier OP3 positive input terminal, and resistance R9The other end ground connection.Operational amplifier
The negative input end electric property coupling resistance R of OP311One end and resistance R10The other end, and operational amplifier
The grid of the outfan electric property coupling switching transistor MN1 of OP3.Resistance R11Other end electric property coupling
Resistance R4One end and resistance R6The other end, and switching transistor MN1 drain electrode electric property coupling light
The outfan of diode string LEDS1.By the effect of each element in above-mentioned drive circuit 321, work as input
Voltage VinWhen rising to certain level, light emitting diode string LEDS1, LEDS2 can be turned on forward simultaneously,
Briefly, by drive circuit 321, light emitting diode string LEDS1, LEDS2 can't be individually
Forward turn on.
In other kind of embodiment, the resistance R of Fig. 3 A4Can be removed, such as Fig. 3 C and Fig. 3 D institutes
Show, Fig. 3 C and Fig. 3 D are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.In this reality
In applying example, the division circuit 333 of light-emitting diode (LED) module 33 is same as the division circuit 323 of Fig. 3 B,
Therefore do not repeat.The error amplifying circuit 332 of light-emitting diode (LED) module 33 only has operational amplifier OP1, fortune
The outfan of the positive input terminal electric property coupling divider DIV of amplifier OP1 is calculated, to receive reference voltage
Vref, and the negative input end electric property coupling resistance R of operational amplifier OP13One end.
In addition, drive circuit 331 includes two operational amplifier OP2, OP3, multiple resistance R5、R6
With two switching transistors MN1, MN2.The electrical computing of positive input terminal of operational amplifier OP2, OP3
The outfan of amplifier OP1, to receive driving voltage, and the negative input of operational amplifier OP2, OP3
End difference electric property coupling resistance R3、R6Two ends.The outfan electric property coupling switching of operational amplifier OP2
The grid of transistor MN2, the source electrode electric property coupling resistance R of switching transistor MN23One end, and cut
Change the outfan and resistance R of the drain electrode electric property coupling light emitting diode string LEDS2 of transistor MN25One
End.Resistance R5With R6Another two ends difference electric property coupling resistance R6、R3Two ends.Operational amplifier OP3
Outfan electric property coupling switching transistor MN1 grid, the electrical coupling of drain electrode of switching transistor MN1
The outfan of sending and receiving optical diode string LEDS1, and the source electrode electric property coupling electricity of switching transistor MN1
Resistance R3One end.By the effect of each element in above-mentioned drive circuit 331, as input voltage VinRise
Forward conducting voltage more than light emitting diode string LEDS1 and be less than the suitable of light emitting diode string LEDS2
During to conducting voltage, light emitting diode string LEDS1 can be turned on forward, and light emitting diode string LEDS2
Can't forward turn on, that is, switching transistor MN2 is closed, and switching transistor MN1 is turned on.When
Input voltage VinWhen being increased beyond the forward conducting voltage of light emitting diode string LEDS2, light emitting diode
String LEDS1, LEDS2 can be turned on forward, that is, switching transistor MN1 is closed, and switching transistor
MN2 is turned on.
In this embodiment, by negative feedback paths, the voltage on the negative input end of operational amplifier OP1
The reference voltage V that can be equal on the positive input terminal of operational amplifier OP1ref, and flow through light emitting diode string
The electric current of LEDS1, LEDS2 is all equal to Vref/R3, and input power can be equal to Vin,avg·(Vref/R3),
By above-mentioned reference voltage VrefWith C/Vin,avgAbove formula is substituted into, then input power can be equal to C (1/R3) fixation
Value.
The light-emitting diode (LED) module and its light-emitting diodes of the plural light emitting diode string of above-described embodiment
Pipe drive module is realized using division circuit, but as previously described, can also use mlultiplying circuit instead real
It is existing.The light-emitting diodes of the plural light emitting diode string realized using mlultiplying circuit described below
Tube module and its LED driving module.
Fig. 4 A are refer to, Fig. 4 A are the schematic diagrams of the light-emitting diode (LED) module of another embodiment of the present invention.
In this embodiment, light-emitting diode (LED) module 41 includes multiple light emitting diode string LEDS1, LEDS2
With LED driving module, LED driving module include drive circuit 411, error amplify
Circuit 412, mlultiplying circuit 413, multiple resistance R1～R4With multiple electric capacity C1、C2.Compared to Fig. 3 A
Embodiment, the fixed voltage C in Fig. 4 A is received by error amplifying circuit 412, and resistance R3、
R4Two ends and electric capacity C1One end be electrically coupled to mlultiplying circuit 413.
Mlultiplying circuit 413 is to by average input voltage Vin,avgWith resistance R3、R4Two ends on voltage
V3、V4Summation be multiplied, to obtain reference voltage Vref, that is, Vref=Vin,avg·(V3+V4).Error is put
Big circuit 412 is to receive reference voltage VrefWith fixed voltage C, and accordingly outputting drive voltage to drive
Galvanic electricity road 411.Drive circuit 411 to according to driving voltage cause light emitting diode string LEDS1,
LEDS2 is able to while forward turning on.Constituted by error amplifying circuit 412 and drive circuit 411
Negative feedback paths, reference voltage VrefFixed voltage can be equal to.Therefore, flow through light emitting diode string LEDS1,
The electric current of LEDS2 can be respectively equal to V3/R3With V4/R4.Therefore, input power can be equal to Vin,avg·(V3/R3
With V4/R4), by above-mentioned average input voltage Vin,avgWith C/ (V3+V4) above formula is substituted into, and design resistance R3、
R4Resistance it is identical, then input power can be equal to C (1/R3) fixed value.
Then, Fig. 4 B are refer to, Fig. 4 B are showing for the light-emitting diode (LED) module of another embodiment of the present invention
It is intended to.The light-emitting diode (LED) module 42 of Fig. 4 B is the one of which of the light-emitting diode (LED) module 41 of Fig. 4 A
Implementation.In the embodiment of Fig. 4 B, mlultiplying circuit 423 includes a multiplier MUL and two
Resistance R5、R6, two inputs of multiplier MUL receive respectively average input voltage Vin,avgWith resistance
R3、R4Two ends on voltage V3、V4Summation, wherein resistance R5、R6Two ends electric coupling multiplication
One input of device MUL, and resistance R5、R6Another two ends electric property coupling resistance R3、R4Two ends.
Error amplifying circuit 422 includes operational amplifier OP1, the electrical coupling of positive input terminal of operational amplifier OP1
The outfan of divider DIV is connect, to receive reference voltage Vref.The negative input end of operational amplifier OP1
Receive fixed voltage C.The framework of drive circuit 421 is then identical with the framework of the drive circuit 321 of Fig. 3 B,
Therefore do not repeat.
In other kind of embodiment, the resistance R of Fig. 4 A4Can be removed, as shown in Figure 4 C, figure
4C is the schematic diagram of the light-emitting diode (LED) module of another embodiment of the present invention.In this embodiment, luminous two
The mlultiplying circuit 433 of pole pipe module 43 only has multiplier MUL.The error of light-emitting diode (LED) module 43
Amplifying circuit 432 is then identical with the error amplifying circuit 422 of Fig. 4 B, therefore does not repeat.In addition, driving electricity
The framework on road 431 is then identical with the framework of the drive circuit 331 of Fig. 3 C, therefore does not repeat.
In this embodiment, by negative feedback paths, the reference on the negative input end of operational amplifier OP1
Voltage VrefThe fixed voltage C that can be equal on the positive input terminal of operational amplifier OP1, and flow through luminous two
The electric current of pole pipe string LEDS1, LEDS2 is all equal to V3/R3, and input power can be equal to
Vin,avg·(V3/R3), by above-mentioned average input voltage Vin,avgWith C/V3Above formula is substituted into, then input power can be waited
In C (1/R3) fixed value.
In sum, the embodiment of the present invention is provided LED driving module and LED die
Block has determines input power, and it will not be varied from the forward conducting voltage of light emitting diode string,
And will not rise with input voltage, therefore the power on the chip of LED driving module is consumed,
Also will not increase with input voltage, to avoid chip overheating or the damage of LED driving module.
The above, optimal specific embodiment only of the invention, only feature of the invention be not limited to
This, any person skilled in the art in the field of the invention, can think easily and change or modification,
All can cover in appended claims hereof scope.
Claims (10)
1. a kind of LED driving module, to drive multiple light emitting diode strings, including：
One division circuit, by a fixed voltage divided by the first voltage for being relevant to an input voltage, to produce
A raw reference voltage；And
One error amplifying circuit, is electrically connected with the division circuit, to receive the reference voltage, and according to
This produces a driving voltage；And
One drive circuit, is electrically connected with the error amplifying circuit, to receive the driving voltage, with basis
The driving voltage selectivity makes these light emitting diode string conductings；
Wherein the division circuit, the error amplifying circuit and the drive circuit form a negative feedback paths, with
Make to be a fixed value corresponding to an input power of the input voltage.
2. LED driving module as claimed in claim 1, wherein error amplifying circuit has
One first operational amplifier, a positive input terminal of first operational amplifier to receive the reference voltage,
An one negative input end electric property coupling at least resistance of first operational amplifier, an at least resistance is to connect
Receive these electric currents flow through when these light emitting diode strings are forward turned on, and first operational amplifier
The one outfan electric property coupling drive circuit.
3. LED driving module as claimed in claim 2, wherein error amplifying circuit is more wrapped
A first resistor and a second resistance are included, an at least resistance includes a 3rd resistor and one the 4th resistance,
The negative input end of first operational amplifier is electrically connected with by the first resistor with the second resistance
The 3rd resistor and the 4th resistance；When the input voltage is more than a particular value, the drive circuit makes simultaneously
These light emitting diode strings are turned on, and each of these light emitting diode strings will not be turned on individually.
4. LED driving module as claimed in claim 3, the wherein drive circuit include one the
Two operational amplifiers, one the 3rd operational amplifier, one first switching transistor, one second switching transistor
With one the 5th to the 9th resistance, wherein a positive input terminal electric property coupling the 5th of second operational amplifier
One first end of resistance and the outfan of first operational amplifier, the one of second operational amplifier is negative
One first end of input electric property coupling and the 6th resistance, the outfan electricity of second operational amplifier
Property couple a grid of first switching transistor, a source electrode electric property coupling of first switching transistor should
One first end at one second end, a first end of the 8th resistance and the 3rd resistor of the 6th resistance, should
One second light emitting diode in drain electrode electric property coupling these light emitting diode strings of first switching transistor
One outfan of string, a first end of the resistance of one second end electric property coupling the 7th of the 5th resistance should
The one second end ground connection of the 7th resistance, a positive input terminal electric property coupling the 5th of the 3rd operational amplifier
Second end of resistance, the one of the resistance of a negative input end electric property coupling the 8th of the 3rd operational amplifier
Second end and a first end of the 9th resistance, an outfan electric property coupling of the 3rd operational amplifier should
One grid of the second switching transistor, the resistance of a source electrode electric property coupling the 9th of second switching transistor
One second end and the 4th resistance a first end, and a drain electrode of first switching transistor is electrical
Couple an outfan of one first light emitting diode string in these light emitting diode strings.
5. LED driving module as claimed in claim 2, the wherein drive circuit include one the
Two operational amplifiers, one the 3rd operational amplifier, one first switching transistor, one second switching transistor,
One the 5th resistance and one the 6th resistance, a positive input terminal and the 3rd computing of second operational amplifier are put
The outfan of one positive input terminal electric property coupling first operational amplifier of big device, second operation amplifier
Negative input end electric property coupling resistance of device, an outfan electric property coupling of second operational amplifier should
One grid of the first switching transistor, source electrode electric property coupling resistance of first switching transistor, should
One first end and these light emitting diodes of the one drain electrode resistance of electric property coupling the 5th of the first switching transistor
One outfan of one second light emitting diode string in string, the negative input end electricity of the 3rd operational amplifier
Property couples one second end of the 5th resistance and a first end of the 6th resistance, and the one of the 6th resistance
The two end electric property coupling resistance, an outfan electric property coupling of the 3rd operational amplifier second switching is brilliant
One grid of body pipe, source electrode electric property coupling resistance of second switching transistor, and second switching
One of one first light emitting diode string in drain electrode electric property coupling these light emitting diode strings of transistor is defeated
Go out end.
6. a kind of LED driving module, to drive multiple light emitting diode strings, including：
One mlultiplying circuit, will be relevant to a first voltage of an input voltage with to receive these luminous two
An at least one ohmically at least voltage of these electric currents that pole pipe string flows through when forward turning on is multiplied, to produce
A raw reference voltage；And
One error amplifying circuit, is electrically connected with the mlultiplying circuit, to receive the reference voltage and a fixation
Voltage, and a driving voltage is produced accordingly；And
One drive circuit, is electrically connected with the error amplifying circuit, to receive the driving voltage, with basis
The driving voltage selectivity makes these light emitting diode string conductings；
Wherein the mlultiplying circuit, the error amplifying circuit and the drive circuit form a negative feedback paths, with
Make to be a fixed value corresponding to an input power of the input voltage.
7. LED driving module as claimed in claim 6, wherein error amplifying circuit has
One first operational amplifier, a negative input end of first operational amplifier to receive the reference voltage,
One positive input terminal of first operational amplifier is to receive the fixed voltage, and first operation amplifier
Outfan electric property coupling drive circuit of device.
8. LED driving module as claimed in claim 7, wherein mlultiplying circuit is taken advantage of including one
Musical instruments used in a Buddhist or Taoist mass, a first resistor and a second resistance, an at least resistance includes that a 3rd resistor is electric with one the 4th
Resistance a, input of the multiplier receives the first voltage, another input of the multiplier by this
One resistance is electrically connected with the 3rd resistor and the 4th resistance with the second resistance, to receive the 3rd
The summation of resistance and the 4th ohmically two voltage；When the input voltage is more than a particular value, the driving
Circuit makes these light emitting diode string conductings simultaneously, and each of these light emitting diode strings will not be independent
Conducting.
9. LED driving module as claimed in claim 8, the wherein drive circuit include one the
Two operational amplifiers, one the 3rd operational amplifier, one first switching transistor, one second switching transistor
With one the 5th to the 9th resistance, wherein a positive input terminal electric property coupling the 5th of second operational amplifier
One first end of resistance and the outfan of first operational amplifier, the one of second operational amplifier is negative
One first end of input electric property coupling and the 6th resistance, the outfan electricity of second operational amplifier
Property couple a grid of first switching transistor, a source electrode electric property coupling of first switching transistor should
One first end at one second end, a first end of the 8th resistance and the 3rd resistor of the 6th resistance, should
One second light emitting diode in drain electrode electric property coupling these light emitting diode strings of first switching transistor
One outfan of string, a first end of the resistance of one second end electric property coupling the 7th of the 5th resistance should
The one second end ground connection of the 7th resistance, a positive input terminal electric property coupling the 5th of the 3rd operational amplifier
Second end of resistance, the one of the resistance of a negative input end electric property coupling the 8th of the 3rd operational amplifier
Second end and a first end of the 9th resistance, an outfan electric property coupling of the 3rd operational amplifier should
One grid of the second switching transistor, the resistance of a source electrode electric property coupling the 9th of second switching transistor
One second end and the 4th resistance a first end, and a drain electrode of first switching transistor is electrical
Couple an outfan of one first light emitting diode string in these light emitting diode strings.
10. LED driving module as claimed in claim 7, the wherein drive circuit include one
Second operational amplifier, one the 3rd operational amplifier, one first switching transistor, one second switching crystal
Pipe, one the 5th resistance and one the 6th resistance, a positive input terminal of second operational amplifier and the 3rd fortune
The outfan of positive input terminal electric property coupling first operational amplifier of amplifier is calculated, second fortune
Negative input end electric property coupling resistance of amplifier is calculated, an outfan of second operational amplifier is electrical
Couple a grid of first switching transistor, source electrode electric property coupling electricity of first switching transistor
Resistance a, first end of the drain electrode resistance of electric property coupling the 5th of first switching transistor lights with these
One outfan of one second light emitting diode string in diode string, the one of the 3rd operational amplifier is negative defeated
Enter to hold one second end of the resistance of electric property coupling the 5th and a first end of the 6th resistance, the 6th resistance
The one second end electric property coupling resistance, an outfan electric property coupling of the 3rd operational amplifier this second
One grid of switching transistor, source electrode electric property coupling resistance of second switching transistor, and this
One first light emitting diode string in drain electrode electric property coupling these light emitting diode strings of two switching transistors
An outfan.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510686602.1A CN106612579B (en) | 2015-10-21 | 2015-10-21 | LED driving module and light-emitting diode (LED) module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510686602.1A CN106612579B (en) | 2015-10-21 | 2015-10-21 | LED driving module and light-emitting diode (LED) module |
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| CN106612579B CN106612579B (en) | 2018-12-07 |
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|---|---|---|---|---|
| CN202258255U (en) * | 2011-10-11 | 2012-05-30 | 深圳Tcl新技术有限公司 | LED driving device, LED light source module and liquid crystal display |
| CN102958246A (en) * | 2011-08-11 | 2013-03-06 | 半导体元件工业有限责任公司 | Light-emitting device control circuit |
| CN202997933U (en) * | 2012-12-20 | 2013-06-12 | 浙江商业职业技术学院 | Dual error amplification switching power supply |
| US20140070705A1 (en) * | 2012-09-13 | 2014-03-13 | Raydium Semiconductor Corporation | Led driving apparatus and operating method thereof |
| CN104519618A (en) * | 2013-09-29 | 2015-04-15 | 欧普照明股份有限公司 | LED driving circuit |
| CN104853467A (en) * | 2014-02-13 | 2015-08-19 | 冠捷投资有限公司 | Light emitting diode driving device |
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2015
- 2015-10-21 CN CN201510686602.1A patent/CN106612579B/en active Active
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|---|---|---|---|---|
| CN102958246A (en) * | 2011-08-11 | 2013-03-06 | 半导体元件工业有限责任公司 | Light-emitting device control circuit |
| CN202258255U (en) * | 2011-10-11 | 2012-05-30 | 深圳Tcl新技术有限公司 | LED driving device, LED light source module and liquid crystal display |
| US20140070705A1 (en) * | 2012-09-13 | 2014-03-13 | Raydium Semiconductor Corporation | Led driving apparatus and operating method thereof |
| CN202997933U (en) * | 2012-12-20 | 2013-06-12 | 浙江商业职业技术学院 | Dual error amplification switching power supply |
| CN104519618A (en) * | 2013-09-29 | 2015-04-15 | 欧普照明股份有限公司 | LED driving circuit |
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| Publication number | Publication date |
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| CN106612579B (en) | 2018-12-07 |
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