CN104080250A - Stroboscopic-free LED lighting circuit and device - Google Patents
Stroboscopic-free LED lighting circuit and device Download PDFInfo
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- CN104080250A CN104080250A CN201410300827.4A CN201410300827A CN104080250A CN 104080250 A CN104080250 A CN 104080250A CN 201410300827 A CN201410300827 A CN 201410300827A CN 104080250 A CN104080250 A CN 104080250A
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Abstract
The embodiment of the invention provides a stroboscopic-free LED lighting circuit which comprises an LED lamp set module, a work voltage keeping module, a constant-current control module and a control unit. The LED lamp set module is divided into a plurality of dynamic matrixes, the constant-current control module is controlled by the control unit to turn on or turn off corresponding LED lamp sets and control current of the corresponding LED lamp sets to be constant, and the control unit can control the constant-current control module to achieve switching between the dynamic matrixes according to voltage change of an input line network. The embodiment of the invention further provides a device with the lighting circuit. According to the stroboscopic-free LED lighting circuit and the device, the constant-current control module is controlled by the control unit to achieve the purpose of turning on or turning off the different LED lamp sets according to the voltage change of the input line network. Furthermore, the output power of LED lamps can be kept constant in different time periods by controlling the output current of the turned-on LED lamp sets, the luminous flux output can be kept constant, and the stroboscopic-free requirement can be met.
Description
Technical field
The present invention relates to LED and drive field, particularly, the present invention relates to without stroboscopic LED lighting circuit and device.
Background technology
At present, linear constant current scheme is widely used in middle low power LED constant-current system with its simple system configuration.Traditional High Power Factor LED linearity constant current control circuit often adopts segmentation to open step by step the method for LED lamp, to realize High Power Factor.
As shown in Figure 1, when input voltage rises, the LED lamp of different phase is opened in segmentation step by step, and output current increases gradually; When input voltage declines, turn-off step by step the LED lamp of different phase in the other direction, output current reduces gradually.This control mode can guarantee High Power Factor, but because the bright quantity of different open stage LED lamps is different, causes power output to change, and when prime is opened, LED lamp quantity is few and electric current is little, and power output is little, and lamp is dark; When rear class is opened, LED lamp quantity is many and electric current is large, and power output is large, and lamp is bright.Therefore, be subject to the curve output relation of supply voltage and the impact of electric current cataclysm, power output is non-constant, causes luminous flux output non-constant, and occurs serious stroboscopic phenomenon, is unfavorable for the long-term use of LED lamp.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency, particularly by the control of control unit, make according to input gauze variation in voltage, realize the unlatching of different LED lamp group or close between a plurality of LED lamp groups, guarantee that each operation time exports identical power output, thereby make output light flux keep constant, solve the serious defect of prior art stroboscopic phenomenon.
In order to achieve the above object, embodiments of the invention have proposed the lighting circuit without stroboscopic LED on the one hand, comprise LED lamp pack module, and operating voltage keeps module, constant-current control module and control unit; Wherein,
Described LED lamp pack module, it has N branch road, each branch road setting is not more than M the LED lamp group of serial connection mutually, wherein, N is row, and M is row, N, M are natural number, N=M>=2, is in parallel between different branch, and by corresponding constant-current control module, is controlled the size of the constant current of corresponding branch road;
Described LED lamp pack module can be decomposed into some dynamic matrixs with the ranks relation of n*m, and wherein, n, m are natural number, 1<=n<=N, 1<=m<=M;
Described operating voltage keeps module, for input voltage during lower than predeterminated voltage for LED lamp group provides operating voltage;
Described constant-current control module, is subject to the control of described control unit, opens or close corresponding LED lamp group, constant to control the size of current of corresponding LED lamp group;
Described control unit, it is according to the change in voltage of input gauze, by controlling described constant-current control module, to realize the switching between a plurality of described dynamic matrixs, all has identical power output while making the dynamic matrix work described in each.
Embodiments of the invention have proposed to comprise the above-mentioned device without stroboscopic LED lighting circuit on the other hand.
The such scheme that the present invention proposes, the mode that adopts segmentation to open step by step LED lamp, when input voltage raises gradually, switches the LED lamp group of forward conduction voltage matches, and controls output current, and power output is remained unchanged.By adjusting the unlatching of LED lamp group or closing, and the size of adjusting the output current of opening LED lamp group, the power output that just can realize the LED lamp group of opening in each time period equates, thereby solved the serious defect of stroboscopic phenomenon in prior art, realized the LED lamp of opening step by step different phase, all there is identical power output, meet the actual demand without stroboscopic.
The such scheme that the present invention proposes, very little to the change of existing system, can not affect the compatibility of system, and realize simple, efficient.
The aspect that the present invention is additional and advantage in the following description part provide, and these will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is that LED lighting circuit schematic diagram is opened in the segmentation that prior art provides;
Fig. 2 is that the present invention is without the schematic diagram of stroboscopic LED lighting circuit;
Fig. 3 is that the present invention is without stroboscopic LED lighting circuit module map;
Fig. 4 a is that the present invention is without voltage output waveform figure in time in stroboscopic LED lighting circuit, Fig. 4 b be the present invention without electric current output waveform figure in time in stroboscopic LED lighting circuit, Fig. 4 c is that the present invention is without power output waveform figure in time in stroboscopic LED lighting circuit;
Fig. 5 is the schematic diagram without stroboscopic LED lighting circuit in the embodiment of the present invention;
Fig. 6 is the schematic diagram without stroboscopic LED lighting circuit in further embodiment of this invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
The such scheme that the present invention proposes, by adjusting the unlatching of LED lamp group or closing, and the size of adjusting the output current of opening LED lamp group, the power output that just can realize the LED lamp group of opening in each time period equates, thereby solved the serious defect of stroboscopic phenomenon in prior art, realize the LED lamp of opening step by step different phase, all there is identical power output, met the actual demand without stroboscopic.
As shown in Figure 2, be the schematic diagram of the present invention without stroboscopic LED lighting circuit.In the embodiment of the present invention without stroboscopic LED lighting circuit, comprise that operating voltage keeps module 10, LED lamp pack module 11, constant-current control module 12 and control unit 13.Wherein, operating voltage keeps module 10, for input voltage during lower than predeterminated voltage for LED lamp group provides operating voltage, wherein, predeterminated voltage is the minimum voltage that can make the normal work of LED lamp group setting in advance; Wherein, operating voltage maintenance module 10 can be can provide for LED lamp pack module circuit or the device of threshold value operating voltage, threshold value operating voltage to refer to can make the normal minimum operating voltage of working of LED lamp pack module; It can be an electric capacity that operating voltage keeps module 10, can be also one and fill out paddy circuit; LED lamp pack module 11, it has N branch road, each branch road setting is not more than M the LED lamp group of serial connection mutually, wherein, N is row, and M is row, N, M are natural number, N=M>=2, is in parallel between different branch, and by corresponding constant-current control module 12, is controlled the size of the constant current of corresponding branch road; LED lamp pack module 11 can be decomposed into some dynamic matrixs with the ranks relation of n*m, and wherein, n, m are natural number, 1<=n<=N, 1<=m<=M; Constant-current control module 12, the control of controlled unit 13, opens or closes corresponding LED lamp group, constant to control the size of current of corresponding LED lamp group; Control unit 13, it by controlling constant-current control module 12, to realize the switching between a plurality of dynamic matrixs, all has identical power output according to the change in voltage of input gauze while making each dynamic matrix work.
The such scheme that the present invention proposes, by the control of control unit, adjust the unlatching of LED lamp group or close, and, by the control of constant-current control module, adjust the size of the output current of opening LED lamp group, the power output that just can realize the LED lamp group of opening in each time period equates, realize LED lamp in the LED lamp pack module of work in different time sections without stroboscopic, extended the useful life of LED.
Of the present invention without stroboscopic LED lighting circuit, comprise LED lamp pack module, operating voltage keeps module, constant-current control module and control unit; Wherein, LED lamp pack module, it has N branch road, and each branch road setting is not more than M the LED lamp group of serial connection mutually, wherein, N is row, M is row, and N, M are natural number, N=M>=2, between different branch, be in parallel, and by corresponding constant-current control module, controlled the size of the constant current of corresponding branch road; LED lamp pack module can be decomposed into some dynamic matrixs with the ranks relation of n*m, and wherein, n, m are natural number, 1<=n<=N, 1<=m<=M; Operating voltage keep module for input voltage during lower than predeterminated voltage for LED lamp group provides operating voltage, wherein, predeterminated voltage is the minimum voltage that can make the normal work of LED lamp group setting in advance; Constant-current control module, the control of controlled unit, opens or closes corresponding LED lamp group, constant to control the size of current of corresponding LED lamp group; Control unit, it by controlling constant-current control module, to realize the switching between a plurality of dynamic matrixs, all has identical power output according to the change in voltage of input gauze while making each dynamic matrix work.
Particularly, each LED lamp group comprises at least one LED element, when it has a plurality of LED lamp group, connects and/or be connected in parallel between a plurality of LED elements.
Between adjacent two dynamic matrixs, transformation relation is: the maximum number of lines n that adjusts last dynamic matrix, and the maximum number of column m that adjusts last dynamic matrix, so that after dynamic matrix when work there is the power output identical with last dynamic matrix, the ranks relation of a dynamic matrix after forming.
Before and after any two, the dynamic matrix of conversion has the LED lamp group that part is identical.
Particularly, control unit comprises a plurality of source followers, and constant-current control module comprises a plurality of source followers.Source follower comprises operational amplifier and sampling resistor, and operational amplifier and sampling resistor are for controlling the size of constant current of each branch road of LED lamp pack module; The positive input of operational amplifier accesses respectively the reference voltage of corresponding voltage value, the sampling resistor ground connection of the negative input end of operational amplifier and respective resistivity values, the output of operational amplifier is connected with the control end of switching circuit respectively, to realize the switching between a plurality of dynamic matrixs.
Particularly, the number of the sampling resistor in source follower is identical with the number of dynamic matrix in LED lamp pack module.
On the one hand, the connected mode of the negative input end of the operational amplifier in source follower is by the sampling resistor ground connection being connected in series.
On the other hand, the connected mode of the negative input end of the operational amplifier in source follower is for by corresponding sampling resistor ground connection, makes between the negative input end of operational amplifier and the output of the switching circuit that its output drives remotely direction be connected with at least one sampling resistor.
Particularly, when input voltage raises, the electric current that the switching circuit that in two adjacent operational amplifiers, rear class operational amplifier drives passes through raises, the voltage of prime operational amplifier negative input end is raise, the output of prime operational amplifier reduces, close the switching circuit of its driving, make to realize and automatically switching between switching circuit.
When input voltage reduces, the electric current that the switching circuit that in two adjacent operational amplifiers, rear class operational amplifier drives passes through reduces, make the lower voltage of prime operational amplifier negative input end, the output of prime operational amplifier raises, open the switching circuit of its driving, make to realize and automatically switching between switching circuit.
Particularly, the number of the operational amplifier in source follower is identical with the number of dynamic matrix in LED lamp pack module.
When said process has been described control unit and has been a plurality of source follower being connected in parallel, without the course of work of stroboscopic LED lighting circuit.
In addition, control unit can be also voltage detecting circuit and ON-OFF control circuit, constant-current control module comprises constant-current control circuit, wherein, voltage detecting circuit is for detection of the change in voltage of input gauze, and by ON-OFF control circuit, control the corresponding switching circuit being connected with each dynamic matrix, to realize the switching to a plurality of dynamic matrixs; Constant-current control circuit, for controlling the size of the output current of each branch road of lamp pack module, all has identical power output while making each dynamic matrix work.
For the ease of understanding the present invention, below in conjunction with more specifically, more complete circuit devcie, the lighting circuit of the above-mentioned proposition of the present invention is further elaborated.
As shown in Figure 3, without stroboscopic LED lighting circuit, be for driving LED array, power supply after the input termination rectification of each LED array, the output voltage V in of the power supply after this rectification is variable voltage, without stroboscopic LED lighting circuit, comprise LED lamp pack module, operating voltage keeps module, constant-current control module 120 and control unit.
Particularly, LED lamp pack module, it has M LED lamp group.Each LED lamp group is respectively 1 or a plurality of LED lamp and combines through series, parallel or connection in series-parallel, and the formation of each LED lamp group can be identical, also can be different.The name of LED lamp group is with LED
nMfor code name, wherein, N is row, and M is row, and N, M are natural number, N=M>=2, and different LED lamp group is driven by corresponding constant-current control module output port; Constant-current control module, the size of the output current of the LED lamp group of opening is controlled in the control of controlled unit and carrying out the unlatching of each LED lamp group or the control of closing simultaneously; Control unit, it is according to the change in voltage of input gauze, by controlling the unlatching of different LED lamp group and the size of firing current thereof, all has identical power output when realizing work; In addition, operating voltage keeps module to provide the minimum operating voltage under normal operating conditions for LED lamp group.
When gauze voltage is lower, control unit is controlled LED
11, LED
21, LED
31, LED
n1lamp group is opened, and output current value is controlled as I
11, I
21, I
31, I
n1, the now pressure drop in LED lamp group is respectively V
11, V
21, V
31, V
n1,
Power output P
1=V
11* I
11+ V
21* I
21+ V
31* I
31+ ... .+V
n1* I
n1;
When gauze voltage is high again, control unit is controlled LED
21, LED
22, LED
31, LED
32, LED
n1, LED
n2lamp group is opened, wherein LED
21and LED
22series connection, its output current value is controlled as I
22.LED
31and LED
32series connection, its output current value is controlled as I
32.LED
n1and LED
n2series connection, its output current value is controlled as I
n2.The now pressure drop in LED lamp group is respectively V
21, V
31, V
n1, V
n2, power output P
2=(V
21+v
22)* I
22+ (V
31+v
32)* I
32+ ... .+ (V
n1+v
n2)* I
n2;
When gauze voltage is high again, control unit is controlled LED
31, LED
32, LED
33..., LED
n1, LED
n2, LED
n3lamp group is opened, wherein LED
31, LED
32and LED
33series connection, its output current value is controlled as I
33.LED
n1, LED
n2and LED
n3series connection, its output current value is controlled as I
n3.The now pressure drop in LED lamp group is respectively V
31, V
32, V
n1, V
n2,
Power output P
3=(V
31+v
32+v
33)* I
33+ ... .+ (V
n1+v
n2+v
n3)* I
n3;
When gauze voltage is high again, control unit is controlled LED lamp group and is opened, and opens as capable the 1st row of X are to X row, and capable the 1st row of X+1 are to X row, until the capable first row of N is to X row, wherein X<N.Control as the capable first row of X simultaneously and connect to X row, output current is I
xX; The first row that X+1 is capable is connected to X row, and output current is I
(X+1) X; Until the capable first row of N is connected to X row, output current is I
nX.Be LED
x1, LED
x2... LED
xX..., LED
n1, LED
n2lED
nXlamp group is opened, wherein LED
x1, LED
x2... LED
xXseries connection, its output current value is controlled as I
xX, the now pressure drop in LED lamp group is respectively V
x1, V
x2, V
xX..., LED
n1, LED
n2, LED
n3lED
n (X-1)and LED
nXseries connection, its output current value is controlled as I
nX.The now pressure drop in LED lamp group is respectively V
n1, V
n2, V
nX.
Power output P
x=(V
x1+v
x2+....+v
xX) * I
xX+ ... .+ (V
n1+v
n2+....+v
nX) * I
nX;
When gauze voltage is high again, N=M, control unit is controlled LED
n1, LED
n2, LED
n3lED
nMlamp group is opened, wherein LED
n1, LED
n2, LED
n3lED
n (M-1)and LED
nMseries connection, its output current value is controlled as I
nM.The now pressure drop in LED lamp group is respectively V
n1, V
n2, V
nM, power output P
m=(V
n1+v
n2+....+v
nM) * I
nM;
By control unit, control and make P
1=P
2=P
3=... .=P
x=... .=P
m; Power output is consistent, thereby makes the luminous flux that power output transforms out keep constant, realize without stroboscopic.
As shown in Figure 4, show the oscillogram of output voltage, output current and power output.During the work of first order LED array, its power output P
out1=V
1* I
1; When second level LED array is worked, its power output P
out2=V
2* I
2; During the work of n level LED array, its power output P
outn=V
n* I
n; By adjusting the connected mode of LED array and the size of output current, just can realize every grade of LED array power output and equate, be i.e. P
out=V
1* I
1=V
2* I
2=... .=V
n* I
nthereby, make power supply there is identical power output when driving different LED array, realized the actual demand without stroboscopic.
As shown in Figure 5, control unit comprises that a plurality of operational amplifiers are (as OP
1-OP
3) and a plurality of sampling resistor (as R
1-R
3), the number of this operational amplifier is identical with the number of LED array, and all sampling resistors are connected in series.In order to reach better effect, the quantity of this sampling resistor also can be arranged to identical with the number of LED array.
The positive input of each operational amplifier accesses respectively the reference voltage of relevant voltage value (as V
r1-V
r3), the forward conduction voltage of the LED array that the reference voltage value that the positive input terminal of each operational amplifier accesses drives to it is directly proportional; The negative input end of each operational amplifier is by the sampling resistor ground connection of respective resistance values, the output of each operational amplifier respectively with for driving the control end of the switching tube of corresponding LED array to be connected, for after driving the output of the switching tube of same LED array to connect altogether through corresponding sampling resistor ground connection.
For each operational amplifier OP
1-OP
3negative input end have multiple connected mode, a kind of connected mode is, after connecing altogether again by the sampling resistor ground connection being serially connected; Another kind of connected mode is, respectively by corresponding sampling resistor ground connection, (direction) is remotely connected with at least one sampling resistor guaranteeing between the output of the switching tube that negative input end and its output were driven of operational amplifier.As input voltage V
induring rising, raising by electric current of the switching tube that in two adjacent operational amplifiers, rear class operational amplifier drives, causes prime operational amplifier negative input end voltage to raise, and the output of prime operational amplifier reduces, thereby close the switching tube of its driving, realized the automatic switchover of two-stage switch; As input voltage V
induring decline, reducing by electric current of the switching tube that in two adjacent operational amplifiers, rear class operational amplifier drives, causes prime operational amplifier negative input end lower voltage, and the output of prime operational amplifier raises, thereby open the switching tube of its driving, realized the automatic switchover of two-stage switch.
In a specific embodiment of the present invention, each operational amplifier forms a plurality of source followers with corresponding sampling resistor and switching tube.
Suppose that LED array and operational amplifier are N, so in this N LED array, the forward conduction voltage of each LED array is to increase progressively gradually to N LED array from the 1st LED array, controls respectively the 1st to N LED array to N operational amplifier for the 1st.
Again further, drive the forward conduction voltage of the LED array that the output of the switching tube of same LED array drives to it to the resistance of the sampling resistor that connects of ground to be directly proportional, drive the sampling resistor number or the resistance that between output and the ground of switching tube of the LED array that forward conduction voltage is larger, are connected larger; And, the output of the switching tube that the 1st negative input end to N-1 operational amplifier and its output drive is at least separated by with a sampling resistor in direction remotely, especially, different to N-1 LED array from the 1st LED array, the negative input end of N operational amplifier and the negative input end of N-1 operational amplifier also connect, and all pass through all sampling resistor ground connection that are serially connected.
Further, have above-mentioned known, the number of sampling resistor is identical with operational amplifier number, be N, N sampling resistor comprises the 1st sampling resistor, the 2nd sampling resistor ... N-1 sampling resistor, a N sampling resistor, all sampling resistor serial connections, the first end ground connection of the 1st sampling resistor.N operational amplifier comprises: the first operational amplifier, the second operational amplifier ... N-1 operational amplifier, N operational amplifier.
The positive input terminal of the first operational amplifier accesses the first reference voltage, output is connected with driving the control end of the switching tube of the 1st LED array, and drives the output of switching tube of the 1st LED array and the first end of the second end of the 1st sampling resistor and the 2nd sampling resistor to be connected;
The positive input terminal of the second operational amplifier accesses the second reference voltage, output is connected with driving the control end of the switching tube of the 2nd LED array, and drives the output of switching tube of the 2nd LED array and the first end of the second end of the 2nd sampling resistor and the 3rd sampling resistor to be connected; (the rest may be inferred)
The positive input terminal of N-1 operational amplifier accesses N-1 reference voltage, output is connected with driving the control end of the switching tube of this N-1 LED array, and drives the output of switching tube and second end of this N-1 sampling resistor and the first end of N sampling resistor of this N-1 LED array to be connected;
The positive input terminal of N operational amplifier accesses N reference voltage, and output is connected with driving the control end of the switching tube of this N LED array, and drives the output of switching tube and second end of N sampling resistor of this N LED array;
In addition, the first reference voltage, the second reference voltage ... the pressure value of N-1 reference voltage, N reference voltage increases progressively successively, the output of the switching tube that its corresponding output of negative input end of the first operational amplifier to the N-1 operational amplifier drives is separated by with at least one sampling resistor in direction remotely, be specially, the negative input end of the first operational amplifier can be with the 2nd, 3 ... the second end of N-1, a N sampling resistor connects; The negative input end of the second operational amplifier can be with the 3rd, 4 ... the second end of N-1, a N sampling resistor connects; The negative input end of N-2 operational amplifier can be connected with the second end of N-1, a N sampling resistor; And the negative input end of N-1 operational amplifier and the negative input end of N operational amplifier and the second end of N sampling resistor connect altogether.
Particularly, sampling resistor is N, wherein, the first end ground connection of the 1st sampling resistor R1, the second end is connected with the first end of the 2nd sampling resistor, the like, the first end of N sampling resistor is connected with the second end of N-1 sampling resistor.And, drive the output of switching tube and second end of N sampling resistor of N LED array of forward conduction voltage maximum, drive the output of switching tube and second end of N-1 sampling resistor of N-1 second largest LED array of forward conduction voltage, the like, the output of the switching tube of the 1st LED array of driving forward conduction voltage minimum is connected with the second end of the 1st sampling resistor.
In a further embodiment, each LED array consists of n*m LED lamp group, and wherein, n is the line number in parallel of LED lamp group in this LED array, and m is the serial number in every row LED lamp group, and n is more than or equal to 2 integer, and m is more than or equal to 1 integer; And each LED array connecting valve pipe quantity is n, is driven by n switching tube.
Output voltage V along with power supply
inincrease, the m in the LED array that control module 120 drives increases gradually, n reduces gradually, the forward conduction voltage of LED array constantly increases, during place in circuit, the pressure drop at two ends also constantly increases; Along with the minimizing of the output voltage of power supply, the n in the LED array that control module drives increases gradually, and m reduces gradually; And the value of n*m is constant, the forward conduction voltage of LED array constantly reduces, and during place in circuit, the pressure drop at two ends also constantly reduces.
In conjunction with reference to figure 3 and Fig. 5, LED array comprises: the 1st LED array 201,202, the 3 LED array 203 of the 2nd LED array.In the 1st LED array 201, n=4, m=1; In the 2nd LED array 202, n=2, m=2; In the 3rd LED array 203, n=1, m=4.Wherein, the first two LED lamp group LED of every row in the 2nd LED array
11, LED
21, and the first two LED lamp group LED of the 1st LED array 201
11, LED
21; The first two LED lamp group LED in the 3rd LED array 203
11, LED
12with first LED lamp group LED in the 1st LED array 201
11and first LED lamp group of the first row of the 2nd LED array LED
12share.
Further, in the present embodiment, sampling resistor comprises the 1st sampling resistor R
1, the 2nd sampling resistor R
2, the 3rd sampling resistor R
3, the 1st sampling resistor R
1first end ground connection, a plurality of operational amplifiers comprise: the first operational amplifier OP
1, the second operational amplifier OP
2, the 3rd operational amplifier OP
3.
The first operational amplifier OP
1positive input terminal access the first reference voltage V
r1, output and the switching tube (K that drives the 1st LED array 201
11, K
12, K
13, K
14) control end connect, drive the switching tube (K of the 1st LED array
11, K
12, K
13, K
14) output and the 1st sampling resistor R
1the second end and the 2nd sampling resistor R
2first end connect;
The second operational amplifier OP
2positive input terminal access the second reference voltage V
r2, output and the switching tube (K that drives the 2nd LED array 202
21, K
22) control end connect, drive the switching tube (K of the 2nd LED array
21, K
22) output and the 2nd sampling resistor R
2the second end and the 3rd sampling resistor R
3first end connect;
The 3rd operational amplifier OP
3positive input terminal access the 3rd reference voltage V
r3, output and the switching tube K that drives the 3rd LED array
31control end connect, drive the switching tube K of the 3rd LED array
31output and the 3rd sampling resistor R
3the second end; The first reference voltage V
r1, the second reference voltage V
r2, the 3rd reference voltage V
r3pressure value increase progressively successively.
In addition, in a specific embodiment of the present invention, the first operational amplifier OP
1negative input end, the second operational amplifier OP
2negative input end, the 3rd operational amplifier OP
3negative input end and the 3rd sampling resistor R
3the second end connect altogether; In further embodiments, the first operational amplifier OP
1negative input end can meet the 2nd sampling resistor R
2the second end and the 3rd sampling resistor R
3first end.
In conjunction with Fig. 5 embodiment, the operation principle without stroboscopic LED lighting circuit is described, specific as follows described in.
3 reference voltage V of the inner generation of control circuit
r1, V
r2and V
r3, V wherein
r1<v
r2<v
r3.Three operational amplifier OP
1, OP
2and OP
3positive input meets respectively V
r1, V
r2, V
r3, negative input serial connection sampling resistor R
3, R
2, R
1to ground.Operational amplifier OP
1output meets switching tube K
11, K
12, K
13and K
14grid, operational amplifier OP
2output meets switching tube K
21and K
22grid, operational amplifier OP
3output meets switching tube K
31grid.Switching tube K
11, K
12, K
13and K
14source electrode serial connection sampling resistor R
1to ground, switching tube K
21and K
22source electrode serial connection sampling resistor R
2, R
1to ground, switching tube K
31source electrode serial connection sampling resistor R
3, R
2and R
1to ground.
When input voltage rises, be first first LED array conducting, operational amplifier OP
1work, comparative voltage VCS follows reference voltage V
r1, now power supply output total current I
out=v
r1/r
1, sampling resistor R
2and R
3do not have electric current to flow through.Due to four switching tube K
11, K
12, K
13and K
14grid and source voltage all equate, I when being operated in saturation region
didentical, four ports are divided output current equally, and each port output current is V
r1/4R
1.The LED lamp group LED of the 1st LED array 201
11, LED
21, LED
31and LED
41lamp is bright, power output P
out=v
lED* V
r1/r
1.
When input voltage rises to the 2nd LED array forward conduction voltage, switching tube K
21and K
22drain voltage rise, start to produce output current, now sampling resistor R
2start current flowing, comparative voltage V
cSvoltage starts to rise, by operational amplifier OP
1its output voltage is declined, final plant closure switching tube K
11, K
12, K
13and K
14, realize switching over.Comparative voltage V
cSrise to V
cS=v
r2rear maintenance is stable, now exports total current I
out=v
r2/ (R
1+ R
2), in like manner each port is divided electric current equally, and each port output current is I
out=v
r2/ 2 (R
1+ R
2).
The LED of the 2nd LED array
11, LED
12, LED
21and LED
22lamp is bright, power output P
out=2V
lED* V
r2/ (r
1+r
2).
When input voltage rises to the 3rd LED array forward conduction voltage, switching tube K
31drain voltage rise, start to produce output current, now resistance R
3start current flowing, comparative voltage V
cSvoltage starts to rise, by operational amplifier OP
2its output voltage is declined, final plant closure K switch
21and K
22, realize switching over.Comparative voltage V
cSrise to V
cS=v
r3rear maintenance is stable, now output current I
out=v
r3/ (R
1+ R
2+ R
3).
The LED lamp group LED of the 3rd LED array
11, LED
12and LED
13lamp is bright, power output P
out=3V
lED* V
r3/ (r
1+r
2+r
3).
When input voltage declines, block switch oppositely switches, and operating state is with above identical.In whole control circuit, as long as adjust resistance R
1-R
3and V
r1-V
r3ratio, just can realize any time power output and be consistent, reach the object 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, and just implementation is different.LED array that the present embodiment connects is identical with embodiment as shown in Figure 5, inner at control circuit, by current mirror, control the output current value under different input voltages, by voltage detecting circuit, detect the variation of input voltage and control the not switching of switch that LED array at the same level connects, realizing LED array output firm power not at the same level.The present embodiment constant output P
out=nV
lED* I
0.
Embodiments of the invention have proposed to comprise the above-mentioned device without stroboscopic LED lighting circuit on the other hand; This device comprises a plurality of LED lamp groups, and the plurality of LED lamp group forms the LED array that a plurality of power is identical.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is to come the hardware that instruction is relevant to complete by program, described program can be stored in a kind of computer-readable recording medium, this program, when carrying out, comprises step of embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module usings that the form of software function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above is only part execution mode of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. without stroboscopic LED lighting circuit, it is characterized in that, comprise LED lamp pack module, operating voltage keeps module, constant-current control module and control unit; Wherein,
Described LED lamp pack module, it has N branch road, each branch road setting is not more than M the LED lamp group of serial connection mutually, wherein, N is row, and M is row, N, M are natural number, N=M>=2, is in parallel between different branch, and by corresponding constant-current control module, is controlled the size of the constant current of corresponding branch road;
Described LED lamp pack module can be decomposed into some dynamic matrixs with the ranks relation of n*m, and wherein, n, m are natural number, 1<=n<=N, 1<=m<=M;
Described operating voltage keeps module, for input voltage during lower than predeterminated voltage for LED lamp group provides operating voltage;
Described constant-current control module, is subject to the control of described control unit, opens or close corresponding LED lamp group, constant to control the size of current of corresponding LED lamp group;
Described control unit, it is according to the change in voltage of input gauze, by controlling described constant-current control module, to realize the switching between a plurality of described dynamic matrixs, all has identical power output while making the dynamic matrix work described in each.
2. according to claim 1ly without stroboscopic LED lighting circuit, it is characterized in that, the LED lamp group described in each comprises at least one LED element, when it has a plurality of LED lamp group, and series connection and/or be connected in parallel between a plurality of LED elements.
3. according to claim 1 without stroboscopic LED lighting circuit, it is characterized in that, between adjacent two dynamic matrixs, transformation relation is: the maximum number of lines n that adjusts last dynamic matrix, and the maximum number of column m that adjusts last dynamic matrix, so that after dynamic matrix when work there is the power output identical with last dynamic matrix, the ranks relation of a dynamic matrix after forming.
4. according to claim 3ly without stroboscopic LED lighting circuit, it is characterized in that, the dynamic matrix of conversion has the LED lamp group that part is identical before and after any two.
5. according to claim 1 without stroboscopic LED lighting circuit, it is characterized in that, it is that circuit or the device of threshold value operating voltage can be provided for LED lamp pack module that described operating voltage keeps module, or it is electric capacity that described operating voltage keeps module, or described operating voltage maintenance module is to fill out paddy circuit.
According to described in any one in claim 1 to 5 without stroboscopic LED lighting circuit, it is characterized in that, described control unit comprises voltage detecting circuit and ON-OFF control circuit, described constant-current control module comprises constant-current control circuit, wherein, described voltage detecting circuit is for detection of the change in voltage of described input gauze, and by described ON-OFF control circuit, control the corresponding switching circuit being connected with each dynamic matrix, to realize the switching to a plurality of described dynamic matrixs, described constant-current control circuit is for controlling the size of the output current of described each branch road of lamp pack module, while making the dynamic matrix work described in each, all there is identical power output.
According to described in any one in claim 1 to 5 without stroboscopic LED lighting circuit, it is characterized in that, described control unit comprises a plurality of source followers, described constant-current control module comprises a plurality of source followers, described source follower comprises operational amplifier and sampling resistor, for controlling the constant current of each branch road of described LED lamp pack module; The positive input of described operational amplifier accesses respectively the reference voltage of corresponding voltage value, the sampling resistor ground connection of the negative input end of described operational amplifier and respective resistivity values, the output of described operational amplifier is connected with the control end of described switching circuit respectively, to realize the switching to a plurality of described dynamic matrixs.
8. according to claim 7ly without stroboscopic LED lighting circuit, it is characterized in that, the number of the sampling resistor in described source follower is identical with the number of dynamic matrix in described LED lamp pack module.
9. according to claim 7ly without stroboscopic LED lighting circuit, it is characterized in that, the number of the operational amplifier in described source follower is identical with the number of dynamic matrix in described LED lamp pack module.
10. according to claim 7ly without stroboscopic LED lighting circuit, it is characterized in that, the connected mode of the negative input end of the operational amplifier in described source follower is for by the sampling resistor ground connection being connected in series.
11. is according to claim 7 without stroboscopic LED lighting circuit, it is characterized in that, the connected mode of the negative input end of the operational amplifier in described source follower is for by corresponding sampling resistor ground connection, makes between the negative input end of described operational amplifier and the output of the switching circuit that its output drives remotely direction be connected with at least one sampling resistor.
12. is according to claim 7 without stroboscopic LED lighting circuit, it is characterized in that, when input voltage raises, the electric current that the switching circuit that in two adjacent operational amplifiers, rear class operational amplifier drives passes through raises, the voltage of prime operational amplifier negative input end is raise, the output of prime operational amplifier reduces, and closes the switching circuit of its driving, makes to realize and automatically switching between switching circuit.
13. is according to claim 7 without stroboscopic LED lighting circuit, it is characterized in that, when input voltage reduces, the electric current that the switching circuit that in two adjacent operational amplifiers, rear class operational amplifier drives passes through reduces, make the lower voltage of prime operational amplifier negative input end, the output of prime operational amplifier raises, and opens the switching circuit of its driving, makes to realize and automatically switching between switching circuit.
14. without stroboscopic LED control device, it is characterized in that, described without stroboscopic LED lighting device comprise described in claim 1 to 13 any one without stroboscopic LED lighting 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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| CN104080250B (en) | 2017-06-20 |
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