CN104010404B - Light emitting diode drive device - Google Patents
Light emitting diode drive device Download PDFInfo
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- CN104010404B CN104010404B CN201310056534.1A CN201310056534A CN104010404B CN 104010404 B CN104010404 B CN 104010404B CN 201310056534 A CN201310056534 A CN 201310056534A CN 104010404 B CN104010404 B CN 104010404B
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Abstract
A kind of light emitting diode drive device, including one first constant current source circuit and a voltage control circuit.The output of this first constant current source circuit one first determines electric current to a primary nodal point so that one first LED module being arranged between a driving node and this primary nodal point circulates, and this first determines electric current；Wherein, this first constant current source circuit has one first detecting node, and produces one first detection signal corresponding to the voltage level at this primary nodal point.This voltage control circuit couples this first detecting node, and responds this first detection signal and produce a control signal being coupled to a mu balanced circuit, to control and to regulate this mu balanced circuit to export a driving voltage to this driving node.Light emitting diode drive device of the present invention can be integrated in integrated circuit, and can automatically adjust mu balanced circuit output and maintain a low-work voltage, and do not affect light emitting diode and normally work.
Description
Technical field
The present invention is related to driving means, particularly relevant light emitting diode drive device.
Background technology
Light emitting diode (LED) driving means is widely used in light emitting diode and drives
In dynamic system, it can be used to detect the duty of light emitting diode and regulate luminescence
Manostat in diode drive system, with export suitable driving voltage drive send out
Optical diode.
In traditional light emitting diode drive device, optical assembly is commonly used to detecting luminescence
The cross-pressure of diode, but optical assembly difficulty is integrated into integrated circuit (integrated
circuit；IC) in.In view of this, it is desirable to have a kind of brand-new light emitting diode drives
Device, it is possible to be integrated in integrated circuit, it is also possible to be used for regulating manostat output
Driving voltage be maintained at low-work voltage and do not interfere with normal function, many to avoid
Remaining power consumption produces, and reaches effect of power saving.
Summary of the invention
The present invention provides a kind of light emitting diode (LED) driving means, including one first
Constant current source circuit and a voltage control circuit.This first constant current source circuit output one
First determines electric current to a primary nodal point so that be arranged at a driving node and this first segment
One first LED module between point circulates, and this first determines electric current；Wherein, this first fixed electricity
Current source circuit has one first detecting node, and produces at corresponding to this primary nodal point
One first detection signal of voltage level.This voltage control circuit couples this first detecting
Node, and respond this first detection signal and produce a control being coupled to a mu balanced circuit
Signal processed, to control and to regulate this mu balanced circuit to export a driving voltage and save to this driving
Point.
Light emitting diode drive device of the present invention can be integrated into integrated circuit
In, and can automatically adjust mu balanced circuit output and maintain a low-work voltage, and
Do not affect light emitting diode normally to work.
Accompanying drawing explanation
Fig. 1 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put the schematic diagram being coupled to mu balanced circuit and LED module.
Fig. 2 is to show to drive according to the light emitting diode described in another embodiment of the present invention
Device collocation mu balanced circuit to drive the schematic diagram organizing LED module more.
Fig. 3 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put collocation mu balanced circuit to drive the schematic diagram organizing LED module more.
Fig. 4 is to show the voltage control circuit in light emitting diode drive device shown in Fig. 3
Enforcement example.
Fig. 5 A is to show to implement according to the aforementioned each light emitting diode drive device of the present invention
One enforcement example of the mu balanced circuit described in example.
Fig. 5 B is to show according to the mu balanced circuit described in another embodiment of the present invention
Another implements example.
Fig. 6 is to show that the light emitting diode implemented according to earlier figures 3 embodiment framework drives
Dynamic device, collocation mu balanced circuit is to drive the schematic diagram of two groups of LED modules.
Fig. 7 A is the voltage waveform showing the embodiment according to Fig. 6 of the present invention when operation
Figure.
Fig. 7 B is the voltage waveform showing the embodiment according to Fig. 6 of the present invention when action
Figure.
Fig. 8 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put and couple two groups of LED modules and the schematic diagram of mu balanced circuit.
Fig. 9 A is the enforcement example of this detecting comparison circuit showing Fig. 8.
Fig. 9 B is to show the detecting comparison circuit according to described in another embodiment of the present invention.
Figure 10 A is the voltage showing the embodiment according to Fig. 8 of the present invention when operation
Oscillogram.
Figure 10 B is the electricity showing another embodiment according to Fig. 8 of the present invention when operation
Corrugating figure.
Figure 11 is to show the constant current source circuit according to described in one embodiment of the invention.
Being simply described as follows of symbol in accompanying drawing:
105,205,305,605,805: light emitting diode (LED) driving means
110: the first LED modules
115: the second LED modules
120: the first constant current source circuits
125: the second constant current source circuits
1100: constant current source circuit
130,430,830: voltage control circuit
140,540,545: mu balanced circuit
NLED: driving node
N1: primary nodal point
N2: secondary nodal point
Nd1: the first detecting node
Nd2: the second detecting node
Vin: power supply
150: the first comparators
155: the second comparators
Vref: given voltage
431: or door
432: enumerator
433: analog converter
CLK: clock signal
560: manostat
R1-R5: the first-the five resistor
Vc [1]: the first comparison signal
Vc [2]: the second comparison signal
Vc, Vc ': control signal
VLED: driving voltage
831,931,932: detecting comparison circuit
AMP1: operational amplifier
D1-D2: the first-the second diode
M1-M2: the first-transistor seconds
V1-V2: the first-the second voltage
Sd1: the first detection signal
Sd2: the second detection signal
VNd1A、VNd1B: the voltage level of the first detection signal
VNd2A、VNd2B: the voltage level of the second detection signal
Sc: control signal
Path A: path A
Path B: path B
Tf: feedback end
Tc: control input
C1: voltage regulation capacitor
Vwork: running voltage
Vr: reference voltage
561: error amplifier
562: voltage regulator circuit
Vt1, Vt2: the current potential of target drives voltage
VFB: the current potential of feedback end Tf.
Detailed description of the invention
The manufacture of various embodiments of the invention discussed more fully below and using method.So
And it should be noted that the feasible inventive concept of many provided by the present invention can be implemented
In various particular ranges.These specific embodiments are only used for illustrating the present invention's
Manufacture and using method, but non-for limiting the scope of the present invention.
Fig. 1 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put the schematic diagram being coupled to mu balanced circuit and LED module.As it is shown in figure 1, luminous two
Pole pipe (LED) driving means 105 includes: one first constant current source circuit 120 and
Voltage control circuit 130.It addition, there is a power supply Vin to be coupled to a mu balanced circuit 140
To provide electric power；This mu balanced circuit 140 and this light emitting diode drive device 105 coupling
It is connected to reference to ground connection.This first constant current source circuit 120 provides one first to determine electric current, makes
A driving node N must be arranged atLEDAnd one the oneth LED mould that between primary nodal point N1
Block 110 circulates and one first determines electric current.Additionally, this first constant current source circuit 120 has
One first detecting node Nd1.This first detecting node Nd1 can produce corresponding to this first
One first detection signal Sd1 of node N1 voltage level.This voltage control circuit 130 coupling
Meet this first detecting node Nd1, respond this first detection signal Sd1 and produce a control letter
Number Sc output is to this mu balanced circuit 140, to control and to regulate this mu balanced circuit 140 to export
One driving voltage VLEDExport to this driving node NLED。
Fig. 2 is to show to drive according to the light emitting diode described in another embodiment of the present invention
Device collocation mu balanced circuit to drive the schematic diagram organizing LED module more, at this to drive
As a example by two groups of LED modules 110 and 115.Also include that one second is fixed compared to Fig. 1, Fig. 2
Current source circuit 125, in order to provide one second to determine electric current so that is arranged at this driving joint
Point NLEDAnd this second LED module 115 that between secondary nodal point N2 circulate one second fixed
Electric current.Additionally, this second constant current source circuit 125 has one second detecting node Nd2,
Produce the one second detection signal Sd2 corresponding to this secondary nodal point N2 voltage level.Fig. 2
This voltage control circuit 130 be coupled to this first and second detecting node (Nd1, Nd2)
With receive simultaneously this first and this second detection signal Sd1 and Sd2.Also, this voltage control
Circuit 130 processed according to this first and this second detection signal Sd1 and Sd2 and produce this control
Signal Sc processed regulates this driving voltage V to control this mu balanced circuit 140LED.Fig. 1 and Fig. 2
Show that light emitting diode drive device couples one group of LED module and two groups of LED respectively
Module.But, the present invention is not limited to this, and the light emitting diode of the present invention drives
Device can drive multiple LED module.
Fig. 3 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put the collocation mu balanced circuit schematic diagram with driving many groups LED module, at this to drive two
As a example by group LED module 110 and 115.Light emitting diode drive device 305 is with numeral electricity
The mode of voltage-controlled system (Digtial Voltage Control) controls mu balanced circuit 140 and regulates
This driving voltage VLED.Compared to Fig. 2, this light emitting diode drive device 305 also wraps
Include one first comparator 150 and one second comparator 155.This first comparator 150 is located at
This first detecting node Nd1 and this voltage control circuit 130 between, in order to by this first
A detection signal Sd1 and given voltage Vref compares；One second comparator 155 sets
Between this second detecting node Nd2 and this voltage control circuit 130, in order to by this
Two detection signal Sd2 compare with this given voltage Vref.This voltage control circuit
130 export according to the comparative result of this first comparator 150 and this second comparator 155
This control signal Sc regulates this driving voltage V to control this mu balanced circuit 140LED。
Fig. 4 is to show the voltage control circuit in light emitting diode drive device shown in Fig. 3
Enforcement example.The voltage control circuit 430 of Fig. 4 includes: one or door 431, counting
Device 432 and a digital analog converter 433.This enumerator 432 couples a clock signal
CLK or the outfan of door 431 and digital analog converter 433.
Fig. 5 A is to show to implement according to the aforementioned each light emitting diode drive device of the present invention
One enforcement example of the mu balanced circuit described in example.In fig. 5, this mu balanced circuit 540
Including: a manostat 560, one the first to one the 3rd resistor R1～R3.Work as Fig. 3
This mu balanced circuit 140 when implementing with the framework of this mu balanced circuit 540 of Fig. 5 A, this is the years old
One end of three resistor R3 couples this control letter that this voltage control circuit 130 is exported
Number Sc, the other end is then couple to this first resistor R1 and the string of this second resistor R2
Meeting a feedback end Tf of node and this manostat 560, wherein this feedback end Tf has one
Current potential VFB.Also, this first resistor R1 and this second resistor R2 of series winding couple
At this driving node NLEDAnd between this reference ground connection.One voltage regulation capacitor C1 couples
This driving node NLEDAnd between this reference ground connection.This manostat 560, such as, also wraps
Include an error amplifier (error amplifier) 561 and a voltage regulator circuit 562, its
In one first end in1 of this comparator 561 be coupled to this feedback end Tf, one second end in2
It is coupled to an a reference voltage Vr and outfan ou1 and couples this voltage regulator circuit 562.
This voltage regulator circuit 562, according to the output of this error amplifier 561, regulates constantly
Export to this driving node NLEDThis driving voltage VLED, until this feedback end Tf
Current potential VFBLevel off to (substantially equal to) this reference voltage Vr.
Fig. 5 B is to show according to the mu balanced circuit described in another embodiment of the present invention
Another implements example.In figure 5b, this mu balanced circuit 545 includes: a manostat 560,
One the 4th resistor R4 and one the 5th resistor R5.When the mu balanced circuit 140 of Fig. 3 is to scheme
When the framework of this mu balanced circuit 545 of 5B is implemented, a control input of this manostat 560
End Tc, couples this control signal Sc that this voltage control circuit 130 exported and this is steady
This feedback end Tf of depressor 560 is coupled to the 4th resistor R4 and the 5th resistor
The tandem node of R5, the 4th resistor R4 wherein contacted and the 5th resistor R5
It is coupled to this driving node NLEDAnd between this reference ground connection.One voltage regulation capacitor C1
Couple this driving node NLEDAnd between this reference ground connection.This mu balanced circuit 545 is by being somebody's turn to do
Control input Tc and receive this control signal Sc, and adjust the output to this driving joint according to this
Point NLEDThis driving voltage VLED；Such as when this control that this control input Tc receives
When signal Sc processed is in first level, this mu balanced circuit 545 persistently regulates this driving electricity
Pressure VLEDUntil just stopping regulation when this control signal Sc is changed to a second electrical level.Value
It is noted that this manostat 560 of Fig. 5 A, Fig. 5 B can be switching type voltage stabilizer or
Linear formula manostat, but it is not limited to this.
Fig. 6 is to show that the light emitting diode implemented according to earlier figures 3 embodiment framework drives
Dynamic device 605, collocation mu balanced circuit 540 is to drive the schematic diagram of two groups of LED modules.
The circuit framework of Fig. 6 is same as shown in Figure 3, and difference is only that Fig. 6 discloses more further
Detailed circuit implementation details.As shown in Figure 6, this voltage control circuit 130 of Fig. 3
This voltage control circuit 430 replacement of available Fig. 4；The most as shown in Figure 6, this of Fig. 3 is steady
Volt circuit 140 can be with this mu balanced circuit 540 replacement of Fig. 5 A.It is somebody's turn to do or the input of door 431
End is couple to the outfan of this first comparator 150 and the defeated of this second comparator 155
Go out end to receive one first comparison signal Vc [1] and one second comparison signal Vc [2].
This digital analog converter 433 exports this control signal Sc to this mu balanced circuit 540, with
Control this mu balanced circuit 540 and regulate this driving voltage VLED.Additionally, above-mentioned embodiment party
Formula only demonstration is used, rather than is used for limiting the circuit structure of the present invention.
Fig. 7 A is the voltage waveform showing the embodiment according to Fig. 6 of the present invention when operation
Figure.The voltage level V of this first detection signal Sd1 it is shown with reference to Fig. 6, Fig. 7 ANd1A
Forward corresponds to this primary nodal point N1 voltage level, the electricity of this second detection signal Sd2
Voltage level VNd2AForward corresponds to this secondary nodal point N2 voltage level；That is this first and
The voltage level V of this second detection signal Sd1 and Sd2Nd1AAnd VNd2A, all along with this
The variation of the voltage level of primary nodal point N1 and this secondary nodal point N2 and forward variation.One
First comparator 150 and one second comparator 155 are respectively by this first detecting node Nd1
And the voltage level V of this second detecting node Nd2Nd1AAnd VNd2AWith a given voltage
Vref compares.
When this mu balanced circuit 540, when the time, t1 powered on, (power supply Vin provided in the t1 second
Electric power is to this mu balanced circuit 540), the voltage level V of this first detection signal Sd1Nd1A
And the voltage level V of this second detection signal Sd2Nd2ASmaller than this given voltage
Vref, therefore this first comparator 150 and the one the of the output of this second comparator 155
One comparison signal Vc [1] and one second comparison signal Vc [2] is the logic of high potential
“1”。
During time t1～t2, due to the voltage level of this first detection signal Sd1
VNd1AAnd the voltage level V of this second detection signal Sd2Nd2ASet still less than this
Voltage Vref, therefore this first comparison signal Vc [1] and this second comparison signal Vc [2]
It is the logical one of high potential so that be somebody's turn to do or this enumerator 432 of door 431 enable is according to seasonal pulse
Signal CLK (being not illustrated in Fig. 7 A) counts, this digital analog converter 433 foundation
The count value of this enumerator 432 changes the current potential Vc of this control signal Sc.This voltage control
Circuit 430 processed is according to this first comparison signal Vc [1] and this second comparison signal Vc [2]
The current potential Vc exporting this control signal Sc can often count once i.e. rank with this enumerator 432
The down work of ladder type changes.This mu balanced circuit 540 is according to the current potential of this control signal Sc
Vc exports this driving voltage VLED, wherein this driving voltage VLEDCurrent potential, along with this
The decline of the current potential Vc of control signal Sc, and do stepped increase.
When time t2, the voltage level V of this second detection signal Sd2Nd2AMore than being somebody's turn to do
Given voltage Vref, therefore this second comparison signal of this second comparator 155 output
Vc [2] is the logical zero of electronegative potential.But, due to the electricity of this first detection signal Sd1
Voltage level VNd1AStill less than this given voltage Vref, this first comparison signal Vc [1] is still
Logical one, is somebody's turn to do or this enumerator 432 of door 431 still enable counts.Therefore this control
The current potential of the current potential Vc of signal Sc processed continues to change from stepped down work of high potential；
And this driving voltage VLEDCurrent potential continue to do stepped increase.
After time t3, due to the voltage level V of this first detection signal Sd1Nd1AWith
And the voltage level V of this second detection signal Sd2Nd2AAll more than this given voltage
Vref, therefore the patrolling of this first comparison signal Vc [1] and these the second comparison signal Vc [2]
Collect and be all " 0 ", be somebody's turn to do or door 431 makes this enumerator 432 anergy.At this voltage control circuit
In 430, the current potential Vc electricity of this control signal Sc of this digital analog converter 433 output
Position stops declining, therefore this driving voltage VLEDIt is not further added by.Now, this driving
Voltage VLEDIt is in suitable low-work voltage and does not interferes with normal function.
In Fig. 6, this mu balanced circuit 540 can also use the mu balanced circuit shown in Fig. 5 B
545；And this voltage control circuit 430, simple logic circuit also can be used to constitute,
Such as it is used alone this or door 431 supplies with the current potential Vc ' producing this control signal Sc and is somebody's turn to do
This control input Tc of mu balanced circuit 545.Refer to Fig. 7 A again, in time t1 ~ t3
Period, this first comparison signal Vc [1] and the logic of this second comparison signal Vc [2]
Value non-concurrent are " 0 ", therefore the current potential of this control signal Sc that this or door 431 export
Vc ' is still maintained at the state of logical one, so this of this mu balanced circuit 545 output drives
Galvanic electricity pressure VLEDCurrent potential present stepped increase.After the t3 time, this is first years old
The logic of comparison signal Vc [1] and this second comparison signal Vc [2] is " 0 " simultaneously, should
Or the current potential Vc ' of this control signal Sc of door 431 output is the state at logical zero, institute
This driving voltage V will not be adjusted again with this mu balanced circuit 545LEDCurrent potential.
Fig. 7 B is the voltage waveform showing the embodiment according to Fig. 6 of the present invention when action
Figure.The voltage level V of this first detection signal Sd1 it is shown with reference to Fig. 6, Fig. 7 BNd1B
Reversely corresponding to the voltage level of this primary nodal point N1, this second detection signal Sd2's
Voltage level VNd2BReversely corresponding to the voltage level of this secondary nodal point N2；That is this
One and the voltage level V of this second detection signal Sd1 and Sd2Nd1BAnd VNd2B, all
Reverse along with this primary nodal point N1 and the variation of the voltage level of this secondary nodal point N2
Variation.This first comparator 150 and this second comparator 155 are respectively by this first detecting
Node Nd1 and the voltage level V of this first detecting node Nd2Nd1BAnd VNd2BWith this both
Determine voltage Vref to compare.In this example, as voltage level VNd1B(VNd2B) be less than
Vref during this given voltage, this first comparison signal Vc [1] (this second comparison signal
Vc [2]) logical value be " 0 ".
During time t1 ~ t3, this first comparison signal Vc [1] and this second compare
The logical value of signal Vc [2] non-concurrent are " 0 " so that be somebody's turn to do or door 431 this counting of enable
Device 432 counts according to clock signal CLK (being not illustrated in Fig. 7 B).As it was previously stated, should
The current potential Vc of control signal Sc can stepped down make to change, and this mu balanced circuit
540 make this driving voltage VLEDCurrent potential continue to do stepped increase.
After time t3, this first comparison signal Vc [1] and this second comparison signal
The logical value of Vc [2] is " 0 " simultaneously, and therefore this mu balanced circuit 540 no longer raises this driving
Voltage VLED.Now, this driving voltage VLEDIt is in suitable running voltage and will not
Affect normal function.
Fig. 8 is to show to drive dress according to the light emitting diode described in one embodiment of the invention
Put and couple two groups of LED modules and the schematic diagram of mu balanced circuit.In fig. 8, this luminescence
Diode driving 805 is with analog voltage control (Analog Voltage Control)
Mode control this mu balanced circuit 140 and regulate this driving voltage VLED.Wherein, Fig. 8
Circuit framework same as shown in Figure 2, it is more detailed that difference is only that Fig. 8 discloses further
Thin circuit implementation details.In fig. 8, a voltage control circuit 830 also includes detecing
Survey comparison circuit 831.This detecting comparison circuit 831 receives and compares this first detecting letter
Number Sd1 and this second detection signal Sd2, controls and adjusts exporting this control signal Sc
Save this mu balanced circuit 140 and export this driving voltage VLEDTo this driving node NLED。
Fig. 9 A is the enforcement example of this detecting comparison circuit 831 showing Fig. 8.Fig. 9 A
In, a detecting comparison circuit 931 includes: an operational amplifier AMP1, one the 1st
Pole pipe D1 and one second diode D2, this first diode D1 and this second diode
The anode of D2 all couple this operational amplifier AMP1 positive input terminal (+), one work electricity
Pressure VworkCouple this operational amplifier AMP1 negative input end (-).When this first detecting
The voltage level forward of signal Sd1 corresponds to the voltage level of this primary nodal point N1 and is somebody's turn to do
The voltage level forward of the second detection signal Sd2 is corresponding to the voltage of this secondary nodal point N2
During level, then this detecting comparison circuit 831 in Fig. 8 can use shown in Fig. 9 A this detect
Survey comparison circuit 931.In this detecting comparison circuit 931, this first diode D1 and
The negative electrode of this second diode D2 be respectively coupled to this first detecting node Nd1 and this
Two detecting node Nd2, to receive this first detection signal Sd1 and this second detecting letter
Number Sd2；This operational amplifier AMP1 then exports this control signal Sc.Based on this detecting
The circuit structure of comparison circuit 931, this first detection signal Sd1 and this second detecting letter
Number Sd2 has lower voltage level person, it will occur in this operational amplifier AMP1
Positive input terminal (+) and determine the voltage level Vc of this control signal Sc.
Fig. 9 B is the enforcement example of this detecting comparison circuit 831 showing Fig. 8.Fig. 9 B
In, a detecting comparison circuit 932 includes: an operational amplifier AMP1, one the 1st
Pole pipe D1 and one second diode D2.This first diode D1 and this second diode
The negative electrode of D2 all couple this operational amplifier AMP1 negative input end (-), this work electricity
Pressure VworkCouple this operational amplifier AMP1 positive input terminal (+).When this first detecting
The voltage level of signal Sd1 reversely corresponds to the voltage level of this primary nodal point N1 and is somebody's turn to do
The voltage level of the second detection signal Sd2 is reversely corresponding to the voltage of this secondary nodal point N2
During level, then this detecting comparison circuit 831 in Fig. 8 can use shown in Fig. 9 B this detect
Survey comparison circuit 932.In this detecting comparison circuit 932, this first diode D1's
The anode of anode and this second diode D2 is respectively coupled to this first detecting node Nd1
And this second detecting node Nd2, with receive this first detection signal Sd1 and this second
Detection signal Sd2；This operational amplifier AMP1 then exports this control signal Sc.Based on
The circuit structure of this detecting comparison circuit 932, this first detection signal Sd1 and this second
Detection signal Sd2 has higher voltage level person, it will occur in this operation and amplify
The negative input end of device AMP1 (-) and determine the voltage level Vc of this control signal Sc.
Figure 10 A is the voltage showing the embodiment according to Fig. 8 of the present invention when operation
Oscillogram.In Figure 10 A, this is first and the electricity of this second detection signal Sd1 and Sd2 years old
Voltage level VNd1AAnd VNd2AForward is corresponding to this primary nodal point N1 and this second section respectively
The voltage level of some N2, therefore the detecting comparison circuit 831 of Fig. 8 is with this detecting ratio of Fig. 9 A
Relatively circuit 931 is implemented.In the present embodiment, the mu balanced circuit 140 of Fig. 8 can use figure
The mu balanced circuit 540 of 5A is implemented.
After when this mu balanced circuit 540, in the time, t1 powers on, (i.e. power supply Vin provides in time t1
Electric power is to this mu balanced circuit 540), the voltage of this primary nodal point N1 and this secondary nodal point N2
Level starts in upward status, and this first detection signal Sd1 and this second detecting letter
The voltage level V of number Sd2Nd1A、VNd2AAlso it is in upward status.In Figure 10 A, in
During time t1～t2, due to the voltage level V of this first detection signal Sd1Nd1AIt is less than
The voltage level V of this second detection signal Sd2Nd2A, therefore this operational amplifier AMP1
Positive input terminal (+) voltage depend on this first detection signal Sd1.This operational amplifier
AMP1 amplifies this first detection signal Sd1 and this running voltage VworkDifference and defeated
Go out the voltage level Vc of this control signal Sc.
Understanding as described in Fig. 5 A, this mu balanced circuit 540 is according to the electricity of this control signal Sc
The change of voltage level Vc and change outputting drive voltage VLED, wherein this control signal Sc
Voltage level Vc, this driving voltage VLEDVoltage V with this feedback end TfFBNumber
Learn relational expression as shown below:
During time t1～tc, this voltage regulation capacitor C1 is filled by this mu balanced circuit 540
Electricity, therefore this driving voltage VLEDIt is gradually increasing, and this first, second detection signal
Voltage level VNd1AWith VNd2AAlso forward correspondence rises.This detecting comparison circuit 931
Positive input terminal (+) the voltage level V that current potential is this first detection signalNd1AAnd it is little
In this running voltage Vwork, this operational amplifier AMP1 positive and negative input of amplification (+)
With (-) difference；This control signal Sc that wherein this operational amplifier AMP1 exports
Voltage level Vc has exceeded the output area (Vin ~ 0V) of this operational amplifier AMP1,
Therefore the voltage level Vc of this control signal Sc is zero potential (this operational amplifier
The output sticking potential of AMP1).T1～tc during this period, due to the electricity of this feedback end Tf
Pressure VFBLess than this reference voltage Vr, this mu balanced circuit 540 persistently promotes this driving voltage
VLEDPotential vt 1 convergence toward target drives voltage.
During time tc～t2, the voltage level V of this first detection signalNd1AClose
This running voltage Vwork, this control signal Sc of this operational amplifier AMP1 output
Voltage level Vc output area (i.e. this operation without departing from this operational amplifier AMP1
The voltage level Vc of this control signal Sc of amplifier AMP1 output departs from saturation region),
So the voltage level Vc of this control signal Sc starts to increase, and then make this feedback end
The voltage V of TfFB(ginseng is changed along with the change of voltage level Vc of this control signal Sc
According to formula (1) and the signal V of Figure 10 AFB).The voltage V of this feedback end TfFBAhead of time in time
Between t2 time equal with this reference voltage Vr, therefore this mu balanced circuit 540 no longer promotes this driving
Voltage VLED.The current potential of this target drives voltage is also because of the voltage of this control signal Sc
The change of level Vc is changed over Vt2 by Vt1.Now this driving voltage VLEDCurrent potential with
The potential vt 2 of this target drives voltage is equal, therefore this driving voltage VLEDReach stable
State.Due to this driving voltage VLEDReached steady statue, therefore this first, second
The voltage level V of detection signalNd1A、VNd2AIt is not further added by, and then makes this control
The voltage level Vc of signal Sc processed is not further added by.
Figure 10 B is the electricity showing another embodiment according to Fig. 8 of the present invention when operation
Corrugating figure.In fig. 1 ob, this first and this second detection signal Sd1 and Sd2
Voltage level VNd1AAnd VNd2BRespectively reversely corresponding to this primary nodal point N1 and this second
The voltage level of node N2, therefore the detecting comparison circuit 831 of Fig. 8 is with this detecting of Fig. 9 B
Comparison circuit 932 is implemented.In the present embodiment, the mu balanced circuit 140 of Fig. 8 can use
The mu balanced circuit 540 of Fig. 5 A is implemented.After when this mu balanced circuit 540, in the time, t1 powers on (i.e.
Power supply Vin provides electrical power to this mu balanced circuit 540 in time t1), this primary nodal point N1
Start in upward status with the voltage level of this secondary nodal point N2, and this first detecting letter
The voltage level V of number Sd1 and this second detection signal Sd2Nd1B、VNd2BIt is then reverse
In declining state.In Figure 10 B, during time t1～t2, this first detection signal Sd1
Voltage level VNd1BVoltage level V more than this second detection signal Sd2Nd2B, therefore
The negative input end of this operational amplifier AMP1 (-) voltage depend on this first detecting letter
Number Sd1.This operational amplifier AMP1 amplifies this first detection signal Sd1 and this work
Voltage VworkDifference and export the voltage level Vc of this control signal Sc.
In like manner, understanding as described in Fig. 5 A, this mu balanced circuit 540 is according to this control signal
The change of the current potential Vc of Sc and change outputting drive voltage VLED.In time t1～tc phase
Between, the voltage V of this feedback end TfFBLess than this reference voltage Vr, this mu balanced circuit 540
Persistently promote this driving voltage VLED.In time t2, the voltage V of this feedback end TfFBDeng
In this reference voltage Vr, this manostat 560 no longer promotes this driving voltage VLED。
Figure 11 is to show the constant current source circuit according to described in one embodiment of the invention.Figure
Shown in this first constant current source circuit 120 shown in 1～3,6,8, Fig. 2～3,6,8
This second constant current source circuit 125 or light emitting diode drive device used many
Individual constant current source circuit all can be implemented with certain power circuit 1100 of Figure 11.
This constant current source circuit 1100 includes: the first transistor M1, transistor seconds
A M2 and operational amplifier OP.In the present embodiment, the first transistor M1,
Two-transistor M2 is nmos pass transistor, but is not limited to this.This first transistor M1
It is coupled to this ginseng with the source electrode of this transistor seconds M2 series winding and this transistor seconds M2
Examining ground connection, wherein the grid of this transistor seconds M2 couples one first voltage V1.Should
The first input end (anode of OP) of operational amplifier OP couples one second voltage V2, the
Two inputs (negative terminal of OP) couple this first transistor M1 and this transistor seconds M2
Tandem node and an outfan couple the grid of this first transistor M1.Additionally,
This constant current source circuit 1100 includes a detecting node.
The present embodiment is as a example by this first constant current source circuit 120, when this first determines electric current
When source circuit 120 is implemented with this constant current source circuit 1100, this first transistor M1's
Drain electrode couples this primary nodal point N1, and this detecting node is as this first detecting node Nd1.
If this first detecting node Nd1 is connected to this first segment by a first path Path A
Point N1, then this first detection signal Sd1 forward pair that this first detecting node Nd1 records
Should be in the voltage level of this primary nodal point N1；If node Nd1 is by one in this first detecting
Second path P ath B is connected to the outfan of this operational amplifier OP, then this first is detectd
This first detection signal Sd1 that survey node Nd1 records is reversely corresponding to this primary nodal point
The voltage level of N1.
In like manner, when this second constant current source circuit 125 is with this constant current source circuit 1100
During enforcement, the drain electrode of this first transistor M1 couples this secondary nodal point N2, this detecting
Node is as this second detecting node Nd2.This second detecting node Nd2 by this first
Path A or this second path P ath B connects this secondary nodal point or this operation amplifier respectively
The outfan of device OP, can record forward or backwards corresponding to this secondary nodal point N2 voltage
Second detection signal Sd2 of level.
In present pre-ferred embodiments, light emitting diode drive device 105,205,
305,605,805,1100 can be integrated in integrated circuit and can automatically adjust
Mu balanced circuit exports and maintains a low-work voltage, and does not just affect light emitting diode
Often work.
The foregoing is only present pre-ferred embodiments, so it is not limited to this
Bright scope, anyone familiar with this technology, in the spirit without departing from the present invention
With in scope, can the most further be improved and be changed, the therefore present invention
Protection domain when being defined in the range of standard with following claims.
Claims (6)
1. a light emitting diode drive device, it is characterised in that including:
One first constant current source circuit, output one first determines electric current to a primary nodal point,
Make the one first LED module circulation being arranged between a driving node and this primary nodal point
This first determines electric current；Wherein, this first constant current source circuit has one first detecting joint
Point, and produce one first detection signal corresponding to the voltage level at this primary nodal point；
And
One voltage control circuit, couples this first detecting node, and responds this and first detect
Survey signal and produce a control signal being coupled to a mu balanced circuit, to control and regulation
This mu balanced circuit exports a driving voltage to this driving node,
Wherein, this first constant current source circuit includes:
It is arranged at this primary nodal point after the first transistor and transistor seconds, mutually concatenation
And one with reference between ground connection, and the grid of this transistor seconds couples one first voltage；With
And
One operational amplifier, its first input end couples one second voltage, and it is second defeated
Enter end and couple the tandem node of this first transistor and this transistor seconds, its outfan
Couple the grid of this first transistor,
This first detecting node is the outfan of this primary nodal point or this operational amplifier,
When this first detecting node is that this primary nodal point and this voltage control circuit judge should
When first detection signal is less than a given voltage, this voltage control circuit exports this control
Signal, raises this driving voltage controlling this mu balanced circuit,
When outfan and this Control of Voltage that this first detecting node is this operational amplifier
When circuit judges this first detection signal more than this given voltage, this voltage control circuit
Export this control signal, raise this driving voltage controlling this mu balanced circuit.
Light emitting diode drive device the most according to claim 1, its feature exists
In, also including: one second constant current source circuit, output one second determines electric current to one the
Two nodes so that one the 2nd LED being arranged between this driving node and this secondary nodal point
Module circulates, and this second determines electric current；Wherein, this second constant current source circuit has one
Two detecting nodes, and produce corresponding to one second of the voltage level at this secondary nodal point
Detection signal；Wherein, this voltage control circuit couples this second detecting node, and depends on
This control signal is produced, to control according to this first detection signal and this second detection signal
This mu balanced circuit regulates this driving voltage.
Light emitting diode drive device the most according to claim 2, its feature exists
In, also include: one first comparator, be located at this first detecting node and this voltage control
Between circuit processed, in order to this first detection signal is compared with this given voltage；
And
One second comparator, be located at this second detecting node and this voltage control circuit it
Between, in order to this second detection signal is compared with this given voltage；
Wherein, this voltage control circuit is according to this first comparator and this second comparator
Comparative result export this control signal, regulate this driving electricity controlling this mu balanced circuit
Pressure.
Light emitting diode drive device the most according to claim 3, its feature exists
In, when this first detection signal is this primary nodal point and this comparative result is that this first is detectd
When surveying signal or this second detection signal less than this given voltage, this voltage control circuit
Control this mu balanced circuit and raise this driving voltage；When this first detection signal is this computing
The outfan of amplifier and this comparative result are this first detection signal or this second detecting
When signal is more than this given voltage, this voltage control circuit controls this mu balanced circuit and raises
This driving voltage.
Light emitting diode drive device the most according to claim 2, its feature exists
In, this voltage control circuit includes a detecting comparison circuit, and this detecting comparison circuit connects
Receive and compare this first detection signal and this second detection signal；
When this first detection signal is this primary nodal point, this detecting comparison circuit exports
Corresponding to this first detection signal and this second detection signal have low-voltage electricity
The difference of flat person and a running voltage is as this control signal, to control this mu balanced circuit
Raise this driving voltage；
When the outfan that this first detection signal is this operational amplifier, this detecting ratio
The output of relatively circuit is corresponding to tool in this first detection signal and this second detection signal
The difference of the person that has high-voltage level and this running voltage is as this control signal, to control
This mu balanced circuit raises this driving voltage.
Light emitting diode drive device the most according to claim 1, also includes this
Mu balanced circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310056534.1A CN104010404B (en) | 2013-02-22 | 2013-02-22 | Light emitting diode drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310056534.1A CN104010404B (en) | 2013-02-22 | 2013-02-22 | Light emitting diode drive device |
Publications (2)
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|---|---|
| CN104010404A CN104010404A (en) | 2014-08-27 |
| CN104010404B true CN104010404B (en) | 2016-09-28 |
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| CN201310056534.1A Expired - Fee Related CN104010404B (en) | 2013-02-22 | 2013-02-22 | Light emitting diode drive device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064467A (en) * | 2006-04-27 | 2007-10-31 | 罗姆股份有限公司 | Power supply device, led driver, illumination device, and display device |
| CN101916962A (en) * | 2010-09-02 | 2010-12-15 | 吉林大学 | Equal-current synthetic high-power constant current power supply circuit |
| CN102170727A (en) * | 2011-02-22 | 2011-08-31 | 苏州永健光电科技有限公司 | Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317403B2 (en) * | 2005-08-26 | 2008-01-08 | Philips Lumileds Lighting Company, Llc | LED light source for backlighting with integrated electronics |
| CN101894530B (en) * | 2009-05-19 | 2015-05-06 | 罗姆股份有限公司 | Driving circuit and protection method thereof, light-emitting device and display device |
| CN101990337B (en) * | 2009-08-03 | 2014-03-26 | 联咏科技股份有限公司 | Light source drive device capable of dynamically maintaining constant current drive and related method thereof |
| CN102646402B (en) * | 2012-04-20 | 2014-04-16 | 青岛海信电器股份有限公司 | Backlight driving voltage control device, backlight driving voltage control method and television |
| TW201434344A (en) * | 2013-02-19 | 2014-09-01 | Princeton Technology Corp | LED driving device |
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2013
- 2013-02-22 CN CN201310056534.1A patent/CN104010404B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101064467A (en) * | 2006-04-27 | 2007-10-31 | 罗姆股份有限公司 | Power supply device, led driver, illumination device, and display device |
| CN101916962A (en) * | 2010-09-02 | 2010-12-15 | 吉林大学 | Equal-current synthetic high-power constant current power supply circuit |
| CN102170727A (en) * | 2011-02-22 | 2011-08-31 | 苏州永健光电科技有限公司 | Light-emitting diode (LED) dynamic scan driving circuit capable of preventing current from overshooting |
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