CN104080250B - Without stroboscopic LED illumination circuit and device - Google Patents
Without stroboscopic LED illumination circuit and device Download PDFInfo
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- CN104080250B CN104080250B CN201410300827.4A CN201410300827A CN104080250B CN 104080250 B CN104080250 B CN 104080250B CN 201410300827 A CN201410300827 A CN 201410300827A CN 104080250 B CN104080250 B CN 104080250B
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Abstract
Embodiments of the invention are proposed without stroboscopic LED illumination circuit, including LED light group module, and operating voltage keeps module, constant-current control module and control unit；LED light group module, resolves into some dynamic matrixs；Constant-current control module, the control of controlled unit is turned on and off corresponding LED light group, to control the size of current of corresponding LED light group constant；Control unit, its according to input gauze voltage change, by controlling constant-current control module, to realize the switching between dynamic matrix so that each dynamic matrix work when be respectively provided with identical power output.Embodiments of the invention also proposed the device including above-mentioned lighting circuit.Such scheme proposed by the present invention, by the control of control unit, so that variation of the constant-current control module according to input gauze voltage, realize being turned on and off for different LED light groups, and the output current of the LED light group by controlling to open, ensure that LED power output keeps constant in different time sections so that luminous flux output is constant, meets the demand without stroboscopic.
Description
Technical field
The present invention relates to field of LED drive, specifically, the present invention relates to without stroboscopic LED illumination circuit and device.
Background technology
At present, linear constant current scheme is widely used with its simple system architecture in middle low power LED constant current system.Pass
The method that the High Power Factor LED linear constant-current control circuit of system often opens LED step by step using segmentation, to realize high power
Factor.
As shown in figure 1, when input voltage rises, the LED of different phase is opened in segmentation step by step, and output current is gradually
Increase；Opposite direction turns off the LED of different phase step by step when the output voltage drops, and output current is gradually reduced.This control
Mode ensure that High Power Factor, but because the bright quantity of different open stage LEDs is different, cause power output to become
Change, when prime is opened, LED quantity is few and electric current is small, and power output is small, and lamp is dark；LED quantity is more when rear class is opened and electric current
Greatly, output power, lamp is bright.Therefore, influenceed by the curve output relation of supply voltage and electric current cataclysm, power output is not permanent
It is fixed, cause luminous flux to export non-constant, and there is serious stroboscopic phenomenon, it is unfavorable for the long-term use of LED.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency, especially by the control of control unit, makes
Being turned on and off for different LED light groups is realized according to input gauze variation in voltage between multiple LED light groups, it is ensured that each work
Moment all exports identical power output, so that output light flux keeps constant, solves prior art stroboscopic phenomenon serious
Defect.
In order to achieve the above object, on the one hand embodiments of the invention are proposed without stroboscopic LED illumination circuit, including LED
Lamp group module, operating voltage keeps module, constant-current control module and control unit；Wherein,
The LED light group module, it has N number of branch road, and each branch road sets and is not more than the M LED light group for mutually concatenating, its
In, N is row, and M is row, and N, M are natural number, N=M>=2, it is in parallel between different branch, and by corresponding current constant control mould
The size of the constant current of block control correspondence branch road；
The LED light group module can be decomposed into some dynamic matrixs with the ranks relation of n*m, wherein, n, m are natural number, 1
<=n<=N, 1<=m<=M；
The operating voltage keeps module, for when input voltage is less than predeterminated voltage, for LED light group, to provide work electric
Pressure；
The constant-current control module, is controlled by described control unit, is turned on and off corresponding LED light group, to control
The size of current of corresponding LED light group is constant；
Described control unit, its according to input gauze voltage change, by controlling the constant-current control module, with realize
The switching between dynamic matrix described in multiple so that the dynamic matrix described in each is respectively provided with identical output work when working
Rate.
On the other hand embodiments of the invention are proposed including the above-mentioned device without stroboscopic LED illumination circuit.
Such scheme proposed by the present invention, by the way of segmentation opens LED step by step, when input voltage gradually rises
When, switch the LED light group of forward conduction voltage matches, and controlled output electric current so that power output keeps constant.By adjusting
Whole LED light group is turned on and off, and the size of the output current of LED light group is opened in adjustment, it is possible to realize each time
Equal, serious so as to the solve stroboscopic phenomenon in the prior art defect of the power output of the LED light group of unlatching, realizes in section
The LED of different phase is opened step by step, identical power output is respectively provided with, and meets the actual demand without stroboscopic.
Such scheme proposed by the present invention, to the change very little of existing system, does not interfere with the compatibility of system, Er Qieshi
It is now simple, efficient.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
The above-mentioned and/or additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein：
Fig. 1 is that LED illumination circuit diagram is opened in the segmentation that prior art is provided；
Fig. 2 is the schematic diagram without stroboscopic LED illumination circuit of the invention；
Fig. 3 is the present invention without stroboscopic LED illumination circuit module figure；
Fig. 4 a be the present invention without voltage in stroboscopic LED illumination circuit with the time output waveform figure, Fig. 4 b are nothings of the present invention
In stroboscopic LED illumination circuit electric current with the time output waveform figure, Fig. 4 c be the present invention without power in stroboscopic LED illumination circuit with
The output waveform figure of time；
Fig. 5 is the schematic diagram without stroboscopic LED illumination circuit in the embodiment of the present invention；
Fig. 6 is the schematic diagram without stroboscopic LED illumination circuit in further embodiment of this invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not construed as limiting the claims.
Such scheme proposed by the present invention, by adjusting being turned on and off for LED light group, and LED light group is opened in adjustment
Output current size, it is possible to realize that the power output of LED light group opened in each time period is equal, so as to solve
The serious defect of stroboscopic phenomenon, realizes the LED for opening different phase step by step in the prior art, is respectively provided with identical output work
Rate, meets the actual demand without stroboscopic.
As shown in Fig. 2 being schematic diagram of the present invention without stroboscopic LED illumination circuit.In the embodiment of the present invention without stroboscopic LED
Lighting circuit, including operating voltage keeps module 10, LED light group module 11, constant-current control module 12 and control unit 13.Its
In, operating voltage keeps module 10, for providing operating voltage for LED light group when input voltage is less than predeterminated voltage, wherein,
Predeterminated voltage is that what is pre-set can make the minimum voltage of LED light group normal work；Wherein, operating voltage holding module 10 can
To be the circuit or device that threshold operative voltage can be provided for LED light group module, threshold operative voltage is to refer to make LED
The minimum operating voltage of lamp group module normal work；It can be an electric capacity, or one that operating voltage keeps module 10
Valley fill circuit；LED light group module 11, it has N number of branch road, and each branch road sets and is not more than the M LED light group for mutually concatenating, its
In, N is row, and M is row, and N, M are natural number, N=M>=2, it is in parallel between different branch, and by corresponding current constant control mould
The size of the constant current of the control correspondence branch road of block 12；LED light group module 11 can be decomposed into some dynamics with the ranks relation of n*m
Matrix, wherein, n, m are natural number, 1<=n<=N, 1<=m<=M；Constant-current control module 12, the control of controlled unit 13,
Corresponding LED light group is turned on and off, to control the size of current of corresponding LED light group constant；Control unit 13, it is according to defeated
Enter the voltage change of gauze, by controlling constant-current control module 12, to realize the switching between multiple dynamic matrixs so that each
Dynamic matrix is respectively provided with identical power output when working.
Such scheme proposed by the present invention, being turned on and off for LED light group is adjusted by the control of control unit, with
And, the size of the output current for opening LED light group is adjusted by the control of constant-current control module, it is possible to realize each time
The power output of the LED light group opened in section is equal, realizes the LED in the LED light group module of work in different time sections
Without stroboscopic, the service life of LED is extended.
It is of the invention without stroboscopic LED illumination circuit, including LED light group module, operating voltage keeps module, current constant control mould
Block and control unit；Wherein, LED light group module, it has N number of branch road, and each branch road sets and is not more than the M LED for mutually concatenating
Lamp group, wherein, N is row, and M is row, and N, M are natural number, N=M>=2, it is in parallel between different branch, and by corresponding perseverance
The size of the constant current of flow control module control correspondence branch road；LED light group module can be decomposed into some with the ranks relation of n*m
Dynamic matrix, wherein, n, m are natural number, 1<=n<=N, 1<=m<=M；Operating voltage keeps module in input voltage
For LED light group provides operating voltage during less than predeterminated voltage, wherein, predeterminated voltage be pre-set can make LED light group just
The minimum voltage for often working；Constant-current control module, the control of controlled unit is turned on and off corresponding LED light group, to control
The size of current of corresponding LED light group is constant；Control unit, its according to input gauze voltage change, by controlling constant current control
Molding block, to realize the switching between multiple dynamic matrixs so that each dynamic matrix is respectively provided with identical output work when working
Rate.
Specifically, each LED light group includes at least one LED element, when it has multiple LED light groups, multiple LED
Connected between element and/or be connected in parallel.
Transformation relation is between two neighboring dynamic matrix：The maximum number of lines n of previous dynamic matrix is adjusted, and is adjusted previous
The maximum number of column m of dynamic matrix, with have when causing that latter dynamic matrix works with previous dynamic matrix identical power output,
Constitute the ranks relation of latter dynamic matrix.
The dynamic matrix of conversion has part identical LED light group before and after any two.
Specifically, control unit includes multiple source followers, and constant-current control module includes multiple source followers.Source follower includes
Operational amplifier and sampling resistor, operational amplifier and sampling resistor are used to control the constant of each branch road of LED light group module
The size of electric current；The positive input of operational amplifier is respectively connected to the reference voltage of corresponding voltage value, operational amplifier it is negative
Input is grounded with the sampling resistor of respective resistivity values, and the output end of operational amplifier connects with the control end of on-off circuit respectively
Connect, to realize to the switching between multiple dynamic matrixs.
Specifically, the number of the sampling resistor in source follower is identical with the number of the dynamic matrix in LED light group module.
On the one hand, the connected mode of the negative input end of the operational amplifier in source follower is the sampling electricity by being connected in series
Resistance ground connection.
On the other hand, the connected mode of the negative input end of the operational amplifier in source follower is by corresponding sampling resistor
Ground connection so that remotely direction between the output end of the on-off circuit that the negative input end of operational amplifier and its output end are driven
It is connected with least one sampling resistor.
Specifically, when input voltage is raised, what rear class operational amplifier drove in two adjacent operational amplifiers opens
The electric current that powered-down road passes through is raised so that the voltage of prime operational amplifier negative input end is raised, the output of prime operational amplifier
Reduce, close the on-off circuit of its driving so that realize automatically switching between on-off circuit.
When input voltage is reduced, the on-off circuit that rear class operational amplifier drives in two adjacent operational amplifiers leads to
The electric current crossed is reduced so that the voltage reduction of prime operational amplifier negative input end, prime operational amplifier output is raised, opened
Its on-off circuit for driving so that realize automatically switching between on-off circuit.
Specifically, the number of the operational amplifier in source follower is identical with the number of the dynamic matrix in LED light group module.
Said process describe control unit be it is multiple be connected in parallel source follower when, the work without stroboscopic LED illumination circuit
Make process.
Additionally, control unit can also be voltage detecting circuit and ON-OFF control circuit, constant-current control module includes constant current
Control circuit, wherein, voltage detecting circuit is used to detect the voltage change of input gauze, and by ON-OFF control circuit control
The corresponding on-off circuit being connected with each dynamic matrix, to realize the switching to multiple dynamic matrixs；Constant-current control circuit is used
In the size of the output current of control lamp each branch road of group module so that each dynamic matrix is respectively provided with identical output work when working
Rate.
It is set forth above to the present invention with reference to more specific, more complete circuit devcie for the ease of understanding the present invention
Lighting circuit is further elaborated.
As shown in figure 3, being that, for driving LED array, the input termination of each LED array is whole without stroboscopic LED illumination circuit
Power supply after stream, the output voltage Vin of the power supply after the rectification is variable voltage, and LED light group is included without stroboscopic LED illumination circuit
Module, operating voltage keeps module, constant-current control module 120 and control unit.
Specifically, LED light group module, it has M LED light group.Each LED light group is respectively 1 or multiple LED
Lamp is combined by series, parallel or connection in series-parallel, and the composition of each LED light group can be with identical, it is also possible to different.LED
The name of group is with LEDNMIt is code name, wherein, N is row, and M is row, and N, M are natural number, N=M>=2, different LED light groups are by relative
The constant-current control module output port answered drives；Constant-current control module, the control of controlled unit and carry out to each LED light group
The control being turned on and off, while control open LED light group output current size；Control unit, it is according to input
The voltage change of gauze, by controlling the unlatching of different LED light groups and its size of firing current, to realize being respectively provided with during work
Identical power output；Additionally, operating voltage keeps module that the electricity of the minimum work under normal operating conditions is provided for LED light group
Pressure.
When gauze voltage is relatively low, control unit control LED11、LED21、LED31……、LEDN1Lamp group is opened, output electricity
Flow valuve is controlled to I11、I21、I31……、IN1, the now pressure drop in LED light group is respectively V11、V21、V31……、VN1,
Power output P1=V11*I11+V21*I21+V31*I31+....+VN1*IN1；
When gauze voltage is high again, control unit control LED21、LED22、LED31、LED32……、LEDN1、LEDN2Lamp group
Open, wherein LED21And LED22Series connection, its output current value is controlled to I22。LED31And LED32Series connection, its output current value control
It is made as I32。LEDN1And LEDN2Series connection, its output current value is controlled to IN2.The now pressure drop in LED light group is respectively V21、
V31……、VN1、VN2, power output P2=(V21+V22)*I22+(V31+V32)*I32+....+(VN1+VN2)*IN2；
When gauze voltage is high again, control unit control LED31、LED32、LED33、……、LEDN1、LEDN2、LEDN3Lamp group
Open, wherein LED31、LED32And LED33Series connection, its output current value is controlled to I33。LEDN1、LEDN2And LEDN3Series connection, its is defeated
Go out current value and be controlled to IN3.The now pressure drop in LED light group is respectively V31、V32……、VN1、VN2,
Power output P3=(V31+V32+V33)*I33+....+(VN1+VN2+VN3)*IN3；
When gauze voltage is high again, control unit control LED light group is opened, and is opened as the 1st row of X rows are arranged to X, X+1 rows
The 1st row to X row, until N rows first row to X arrange, wherein X<N.The first row for being controlled to X rows simultaneously arranges series connection to X,
Output current is IXX；The first row of X+1 rows is arranged to X and connected, and output current is I(X+1)X；Until the first row of N rows is arranged to X
Series connection, output current is INX.That is LEDX1、LEDX2、……LEDXX、……、LEDN1、LEDN2……LEDNXLamp group is opened, wherein
LEDX1、LEDX2、……LEDXXSeries connection, its output current value is controlled to IXX, the now pressure drop in LED light group is respectively VX1、
VX2……、VXX... ..., LEDN1、LEDN2、LEDN3……LEDN(X-1)And LEDNXSeries connection, its output current value is controlled to INX.This
When LED light group on pressure drop be respectively VN1、VN2……、VNX。
Power output PX=(VX1+VX2+....+VXX)*IXX+....+(VN1+VN2+....+VNX)*INX；
When gauze voltage is high again, N=M, control unit control LEDN1、LEDN2、LEDN3……LEDNMLamp group is opened, its
Middle LEDN1、LEDN2、LEDN3……LEDN(M-1)And LEDNMSeries connection, its output current value is controlled to INM.Now in LED light group
Pressure drop is respectively VN1、VN2……、VNM, power output PM=(VN1+VN2+....+VNM)*INM；
Control to cause P by control unit1=P2=P3=... .=PX=... .=PM；So that power output keeps one
Cause, so that the luminous flux that power output is converted to keeps constant, that is, realize without stroboscopic.
As shown in figure 4, showing the oscillogram of output voltage, output current and power output.First order LED array work
When making, its power output Pout1=V1*I1；When second level LED array works, its power output Pout2=V2*I2；... n-th grade of LED
When array works, its power output Poutn=Vn*In；By adjusting the connected mode of LED array and the size of output current,
Can just realize that every grade of LED array power output is equal, i.e. Pout=V1*I1=V2*I2=... .=Vn*In, so that power supply
There is identical power output when different LED arrays are driven, the actual demand without stroboscopic is realized.
As shown in figure 5, control unit includes multiple operational amplifier (such as OP1-OP3) and multiple sampling resistor (such as R1-
R3), the number of the operational amplifier is identical with the number of LED array, and all sampling resistors are connected in series.In order to reach preferably
Effect, the quantity of the sampling resistor can also be arranged to identical with the number of LED array.
The positive input of each operational amplifier is respectively connected to reference voltage (such as V of relevant voltage valueR1-VR3), each
The forward conduction voltage of reference voltage value that the positive input terminal of operational amplifier is accessed and its LED array for being driven is into just
Than；The negative input end of each operational amplifier is grounded by the sampling resistor of respective resistance values, the output end of each operational amplifier
Connected with the control end of the switching tube for driving corresponding LED array respectively, the switching tube for driving same LED array
Output end connect altogether after by corresponding sampling resistor be grounded.
For each operational amplifier OP1-OP3Negative input end have various connected modes, a kind of connected mode is to connect altogether
The sampling resistor again by being serially connected is grounded afterwards；Another connected mode is to be grounded by corresponding sampling resistor respectively,
(i.e. in side remotely between the output end of the switching tube driven with the negative input end and its output end that ensure operational amplifier
To) it is connected with least one sampling resistor.As input voltage VinDuring rising, rear class computing is put in two adjacent operational amplifiers
Being raised by electric current for the switching tube that big device drives, causes prime operational amplifier negative input end voltage to raise, and prime computing is put
Big device output is reduced, so as to close the switching tube of its driving, realizes the automatic switchover of two-stage switch；As input voltage VinDecline
When, being reduced by electric current for the switching tube that rear class operational amplifier drives in two adjacent operational amplifiers causes prime to be transported
The reduction of amplifier negative input end voltage is calculated, the output of prime operational amplifier is raised, so as to open the switching tube of its driving, realized
The automatic switchover of two-stage switch.
In one particular embodiment of the present invention, each operational amplifier is constituted with corresponding sampling resistor and switching tube
Multiple source followers.
Assuming that LED array and operational amplifier are N number of, then in N number of LED array, the positive guide of each LED array
Energization pressure is gradually incremented by n-th LED array from the 1st LED array, and the 1st to n-th operational amplifier controls respectively
1 to n-th LED array.
Yet further, the resistance of the sampling resistor that the output end of the switching tube of the same LED array of driving is connect to ground
The forward conduction voltage of the LED array driven to it is directly proportional, that is, drive the switch of the bigger LED array of forward conduction voltage
The sampling resistor number or resistance connected between the output end and ground of pipe are bigger；And, the 1st to the N-1 operational amplifier
The output end of switching tube that is driven with its output end of negative input end in direction remotely at least with a sampling resistor phase
Every especially, different to the N-1 LED array from the 1st LED array, the negative input end and N-1 of n-th operational amplifier
The negative input end of individual operational amplifier simultaneously connects, i.e. all sampling resistors ground connection all by being serially connected.
Further, have it is above-mentioned understand, the number of sampling resistor is identical with operational amplifier number, be it is N number of, it is N number of to adopt
Sample resistance includes the 1st sampling resistor, the N-1 sampling resistor of the 2nd sampling resistor ..., n-th sampling resistor, all to adopt
Sample resistance is concatenated, the 1st first end ground connection of sampling resistor.N number of operational amplifier includes：First operational amplifier, second
Operational amplifier ... N-1 operational amplifiers, N operational amplifiers.
The positive input terminal of the first operational amplifier accesses the first reference voltage, the 1st LED array of output end and driving
The control end connection of switching tube, and the 1st output end of the switching tube of LED array is driven with the 1st the second of sampling resistor
End and the 2nd first end connection of sampling resistor；
The positive input terminal of the second operational amplifier accesses the second reference voltage, the 2nd LED array of output end and driving
The control end connection of switching tube, and the 2nd output end of the switching tube of LED array is driven with the 2nd the second of sampling resistor
End and the 3rd first end connection of sampling resistor；... (the rest may be inferred)
The positive input terminal of N-1 operational amplifiers accesses this N-1 LED gusts of N-1 reference voltages, output end and driving
The control end connection of the switching tube of row, and the N-1 output end of the switching tube of LED array is driven with this N-1 sampling
The first end connection at second end and n-th sampling resistor of resistance；
The positive input terminal of N operational amplifiers accesses N reference voltages, and output end is opened with the driving n-th LED array
The control end connection of pipe is closed, and drives the output end of the switching tube of the n-th LED array and the second end of n-th sampling resistor；
In addition, the pressure value of the first reference voltage, the second reference voltage ... N-1 reference voltages, N reference voltages is successively
It is incremented by, the switching tube that its corresponding output end of negative input end of the first operational amplifier to N-1 operational amplifiers is driven
Output end be separated by with least one sampling resistor in direction remotely, specifically, the negative input end of the first operational amplifier
Can be connected with the second end of the 2nd, 3 ... N-1, N number of sampling resistor；The negative input end of the second operational amplifier can with the 3rd,
The second end connection of 4 ... N-1, N number of sampling resistor；... the N-2 negative input end of operational amplifier can be with N-1, N number of
The second end connection of sampling resistor；And, the negative input end of the N-1 operational amplifier and the negative input of n-th operational amplifier
End connects altogether with the second end of n-th sampling resistor.
Specifically, sampling resistor is for N number of, wherein, the 1st first end ground connection of sampling resistor R1, the second end with the 2nd
The first end connection of sampling resistor, the like, the second end of the first end of n-th sampling resistor and the N-1 sampling resistor
Connection.Also, drive the output end and n-th sampling resistor of the switching tube of the maximum n-th LED array of forward conduction voltage
Second end, drives the N-1 second largest output end of the switching tube of LED array of forward conduction voltage with the N-1 sampling electricity
Second end of resistance, the like, the 1st minimum output end of the switching tube of LED array of forward conduction voltage is driven with the 1st
The second end connection of sampling resistor.
In a further embodiment, each LED array is made up of n*m LED light group, wherein, n is in the LED array
The line number in parallel of LED light group, m is the serial number in every row LED light group, and n is more than or equal to 2 integer, and m is more than or equal to 1
Integer；Also, each LED array connecting valve pipe quantity is n, i.e., driven by n switching tube.
With the output voltage V of power supplyinIncrease, the m in the LED array that control module 120 is driven gradually increases, n
Gradually decrease, i.e. the forward conduction voltage of LED array constantly increases, the pressure drop at two ends also constantly increases when accessing circuit；With
The reduction of the output voltage of power supply, the n in the LED array that control module is driven gradually increases, and m is gradually decreased；And the value of n*m
Constant, i.e. the forward conduction voltage of LED array is constantly reduced, and the pressure drop at two ends is also constantly reduced when accessing circuit.
With reference to Fig. 3 and Fig. 5 is referred to, LED array includes：1st LED array 201, the 2nd LED array 202, the 3rd LED
Array 203.In the 1st LED array 201, n=4, m=1；In the 2nd LED array 202, n=2, m=2；At the 3rd
In LED array 203, n=1, m=4.Wherein, the first two LED light group LED often capable in the 2nd LED array11、LED21, and the 1st
The first two LED light group LED of individual LED array 20111、LED21；The first two LED light group LED in 3rd LED array 20311、LED12
With first LED light group LED in the 1st LED array 20111And first LED light group of the 2nd the first row of LED array
LED12Share.
Further, in the present embodiment, sampling resistor includes the 1st sampling resistor R1, the 2nd sampling resistor R2, the 3rd
Sampling resistor R3, the 1st sampling resistor R1First end ground connection, multiple operational amplifiers include：First operational amplifier OP1、
Second operational amplifier OP2, the 3rd operational amplifier OP3。
First operational amplifier OP1Positive input terminal access the first reference voltage VR1, the 1st LED of output end and driving
Switching tube (the K of array 20111、K12、K13、K14) control end connection, drive the 1st switching tube (K of LED array11、K12、
K13、K14) output end and the 1st sampling resistor R1The second end and the 2nd sampling resistor R2First end connection；
Second operational amplifier OP2Positive input terminal access the second reference voltage VR2, the 2nd LED of output end and driving
Switching tube (the K of array 20221、K22) control end connection, drive the 2nd switching tube (K of LED array21、K22) output end
With the 2nd sampling resistor R2The second end and the 3rd sampling resistor R3First end connection；
3rd operational amplifier OP3Positive input terminal access the 3rd reference voltage VR3, the 3rd LED of output end and driving
The switching tube K of array31Control end connection, drive the 3rd switching tube K of LED array31Output end with the 3rd sampling electricity
Resistance R3The second end；First reference voltage VR1, the second reference voltage VR2, the 3rd reference voltage VR3Pressure value it is incremented by successively.
In addition, in one particular embodiment of the present invention, the first operational amplifier OP1Negative input end, the second computing
Amplifier OP2Negative input end, the 3rd operational amplifier OP3Negative input end and the 3rd sampling resistor R3The second end be total to
Connect；In further embodiments, the first operational amplifier OP1Negative input end can meet the 2nd sampling resistor R2The second end and the 3rd
Sampling resistor R3First end.
The operation principle without stroboscopic LED illumination circuit is illustrated with reference to Fig. 5 embodiments, it is described in detail below.
Control circuit inside produces 3 reference voltage VsR1、VR2And VR3, wherein VR1<VR2<VR3.Three operational amplifier OP1、
OP2And OP3Positive input meets V respectivelyR1、VR2、VR3, negative input concatenation sampling resistor R3、R2、R1To ground.Operational amplifier
OP1Output meets switching tube K11、K12、K13And K14Grid, operational amplifier OP2Output meets switching tube K21And K22Grid, computing
Amplifier OP3Output meets switching tube K31Grid.Switching tube K11、K12、K13And K14Source electrode concatenation sampling resistor R1To ground, open
Close pipe K21And K22Source electrode concatenation sampling resistor R2、R1To ground, switching tube K31Source electrode concatenation sampling resistor R3、R2And R1To ground.
First it is first LED array conducting, operational amplifier OP when input voltage rises1Work, comparison voltage
VCS follows reference voltage VR1, now power supply output total current IOut=VR1/R1, sampling resistor R2And R3There is no electric current to flow through.Due to
Four switching tube K11、K12、K13And K14Grid and source voltage it is equal, the I when saturation region is operated indIt is identical, i.e., four ends
Mouth divides output current equally, and each port output current is VR1/4R1.The 1st LED light group LED of LED array 20111、LED21、
LED31And LED41Lamp is bright, power output POut=VLED*VR1/R1。
When input voltage rises to the 2nd LED array forward conduction voltage, switching tube K21And K22Drain voltage on
Rise, start to produce output current, now sampling resistor R2Begin to flow through electric current, comparison voltage VCSVoltage begins to ramp up, by fortune
Calculate amplifier OP1Decline its output voltage, final plant closure switching tube K11、K12、K13And K14, realize switch switching.Comparison voltage
VCSRise to VCS=VR2Stabilization is kept afterwards, now exports total current IOut=VR2/(R1+R2), similarly each port divides electric current equally, often
Individual port output current is IOut=VR2/2(R1+R2)。
2nd LED of LED array11、LED12、LED21And LED22Lamp is bright, power output POut=2VLED*VR2/(R1+R2)。
When input voltage rises to the 3rd LED array forward conduction voltage, switching tube K31Drain voltage rise, open
Begin to produce output current, now resistance R3Begin to flow through electric current, comparison voltage VCSVoltage begins to ramp up, by operational amplifier
OP2Decline its output voltage, final plant closure switch K21And K22, realize switch switching.Comparison voltage VCSRise to VCS=VR3Afterwards
Stabilization is kept, now output current IOut=VR3/(R1+R2+R3)。
The 3rd LED light group LED of LED array11、LED12And LED13Lamp is bright, power output POut=3VLED*VR3/(R1+R2+
R3)。
When the output voltage drops, block switch reversely switches, and working condition is identical with the above.In whole control circuit
In, as long as adjusting resistance R1-R3And VR1-VR3Ratio, it is possible to realize that any time power output is consistent, reach
Purpose without stroboscopic.
Fig. 6 is an alternative embodiment of the invention.The operation principle of this embodiment is identical with the embodiment described in Fig. 5, only
It is different implementation.It is identical with embodiment as shown in Figure 5 that the present embodiment connects LED array, inside control circuit,
Output current value under different input voltages is controlled by current mirror, by voltage detecting circuit detect input voltage change simultaneously
Control LED array not at the same level connects the switching of switch, realizes LED array output firm power not at the same level.The present embodiment is constant defeated
Go out power POut=nVLED*I0。
On the other hand embodiments of the invention are proposed including the above-mentioned device without stroboscopic LED illumination circuit；The device bag
Multiple LED light groups are included, the plurality of LED light group constitutes multiple power identical LED arrays.
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
The rapid hardware that can be by program to instruct correlation is completed, and described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
Additionally, during each functional unit in each embodiment of the invention can be integrated in a processing module, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit is to realize in the form of software function module and as independent production marketing or when using, it is also possible to which storage is in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (13)
1. without stroboscopic LED illumination circuit, it is characterised in that including LED light group module, operating voltage keeps module, current constant control
Module and control unit；Wherein,
The LED light group module, it has N number of branch road, and each branch road sets and is not more than the M LED light group for mutually concatenating, wherein, N
It is row, M is row, and N, M are natural number, N=M>=2, it is in parallel between different branch, and by corresponding constant-current control module control
The size of the constant current of system correspondence branch road；LED light group described in each includes at least one LED element；
The LED light group module can be decomposed into some dynamic matrixs with the ranks relation of n*m, wherein, n, m are natural number, 1<=n
<=N, 1<=m<=M；Some dynamic matrixs include the dynamic matrix of the row of n rows 1 and 1 row m row；
The operating voltage keeps module, for when input voltage is less than predeterminated voltage for LED light group provides operating voltage；
The constant-current control module, is controlled by described control unit, is turned on and off corresponding LED light group, corresponding to control
LED light group size of current it is constant；
Described control unit, its according to input gauze voltage change, by controlling the constant-current control module, to realize multiple
Switching between described dynamic matrix so that the dynamic matrix described in each is respectively provided with identical power output when working；Phase
Transformation relation is between adjacent two dynamic matrixs：The maximum number of lines n of previous dynamic matrix is adjusted, and adjusts previous dynamic matrix
Maximum number of column m, with have when causing that latter dynamic matrix works with previous dynamic matrix identical power output, constitute latter dynamic
The ranks relation of state matrix；Wherein, the maximum number of lines n of the previous dynamic matrix of adjustment, and adjust previous dynamic matrix
Maximum number of column m includes：The maximum number of lines n of previous dynamic matrix is subtracted one, and correspondence adds the maximum number of column m of previous dynamic matrix
One.
2. it is according to claim 1 without stroboscopic LED illumination circuit, it is characterised in that the LED light group described in each, when it
During with multiple LED light groups, connect and/or be connected in parallel between multiple LED elements.
3. it is according to claim 1 without stroboscopic LED illumination circuit, it is characterised in that the dynamic of conversion before and after any two
Matrix has part identical LED light group.
4. it is according to claim 1 without stroboscopic LED illumination circuit, it is characterised in that the operating voltage keeps the module to be
The circuit or device of threshold operative voltage can be provided for LED light group module.
5. it is as claimed in any of claims 1 to 4 without stroboscopic LED illumination circuit, it is characterised in that the control list
Unit includes voltage detecting circuit and ON-OFF control circuit, and the constant-current control module includes constant-current control circuit, wherein, the electricity
Pressure detection circuit is used to detect the voltage change of the input gauze, and is controlled and each dynamic by the ON-OFF control circuit
The corresponding on-off circuit that matrix is connected, to realize the switching to the dynamic matrix described in multiple, the constant-current control circuit
Size for controlling the output current of each branch road of lamp group module so that the dynamic matrix described in each is respectively provided with when working
Identical power output.
6. it is according to claim 5 without stroboscopic LED illumination circuit, it is characterised in that described control unit includes multiple sources
With device, the constant-current control module includes multiple source followers, and the source follower includes operational amplifier and sampling resistor, for
Control the constant current of each branch road of the LED light group module；It is right that the positive input of the operational amplifier is respectively connected to
The negative input end of the reference voltage of magnitude of voltage, the operational amplifier is answered to be grounded by the sampling resistor of respective resistivity values, it is described
Control end of the output end of operational amplifier respectively with the on-off circuit is connected, to realize to the dynamic matrix described in multiple
Switching.
7. it is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that the sampling resistor in the source follower
Number it is identical with the number of the dynamic matrix in the LED light group module.
8. it is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that the operation amplifier in the source follower
The number of device is identical with the number of the dynamic matrix in the LED light group module.
9. it is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that the operation amplifier in the source follower
The connected mode of the negative input end of device is that the sampling resistor by being connected in series is grounded.
10. it is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that the operation amplifier in the source follower
The connected mode of the negative input end of device is to be grounded by corresponding sampling resistor so that the negative input end of the operational amplifier with
Remotely direction is connected with least one sampling resistor between the output end of the on-off circuit that its output end is driven.
11. is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that adjacent when input voltage is raised
Two operational amplifiers in the electric current that passes through of on-off circuit that drives of rear class operational amplifier raise so that prime operation amplifier
The voltage of device negative input end is raised, and the output of prime operational amplifier is reduced, and closes the on-off circuit of its driving so that on-off circuit
Between realize automatically switch.
12. is according to claim 6 without stroboscopic LED illumination circuit, it is characterised in that adjacent when input voltage is reduced
Two operational amplifiers in the electric current that passes through of on-off circuit that drives of rear class operational amplifier reduce so that prime operation amplifier
The voltage reduction of device negative input end, prime operational amplifier output is raised, and opens the on-off circuit of its driving so that on-off circuit
Between realize automatically switch.
13. without stroboscopic LED control devices, it is characterised in that described to include claim 1 to 12 times without stroboscopic LED light device
Described in one without stroboscopic LED illumination circuit.
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| CN201410300827.4A CN104080250B (en) | 2014-06-27 | 2014-06-27 | Without stroboscopic LED illumination circuit and device |
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| CN201410300827.4A CN104080250B (en) | 2014-06-27 | 2014-06-27 | Without stroboscopic LED illumination circuit and device |
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| WO2016197971A1 (en) * | 2015-06-12 | 2016-12-15 | The Hong Kong University Of Science And Technology | Converter-free led driver with low-frequency flicker reduction |
| CN105188211A (en) * | 2015-09-02 | 2015-12-23 | 绍兴恒力特微电子有限公司 | Light-emitting diode (LED) circuit compatible with low-voltage and high-voltage input and constant-power output |
| EP3540703B1 (en) | 2018-03-16 | 2024-04-24 | Carrier Corporation | Single stage current controller for a notification appliance |
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| CN202013724U (en) * | 2010-12-29 | 2011-10-19 | 海信（山东）空调有限公司 | LED dynamic-static separation realization circuit and air conditioner equipped therewith |
| CN102196640B (en) * | 2011-05-20 | 2014-03-12 | 杭州璞莱科技有限公司 | Control circuit of LED (light-emitting diode) lights and light strings |
| CN102711319B (en) * | 2012-05-03 | 2015-05-06 | 李云霄 | LED (light emitting diode) light source subregion subsection transformation input driving control method and control circuit thereof |
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| CN203251462U (en) * | 2013-04-01 | 2013-10-23 | 黄世蔚 | LED drive device capable of changing series-parallel composition along input voltage |
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