CN101702854A - Circuit for multi-path LED constant current driving - Google Patents
Circuit for multi-path LED constant current driving Download PDFInfo
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- CN101702854A CN101702854A CN200910225966A CN200910225966A CN101702854A CN 101702854 A CN101702854 A CN 101702854A CN 200910225966 A CN200910225966 A CN 200910225966A CN 200910225966 A CN200910225966 A CN 200910225966A CN 101702854 A CN101702854 A CN 101702854A
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Abstract
The invention discloses a circuit for a multi-path LED constant current driving, comprising a DC/AC converting circuit, a main transformer, a current sharing transformer, a multi-path rectification filter circuit and LED loads, the circuit for the multi-path LED constant current driving is characterized in that: the input direct voltage is converted into alternating voltage by the DC/AC converting circuit, the alternating voltage is isolated by the main transformer and then is input to the current sharing transformer, the current sharing transformer has the function of current sharing for each path of the current, and each path of the current is respectively output to each LED load after passing through each rectification filter circuit. The circuit for the multi-path LED constant current driver has the beneficial effects that: firstly, the balance of load current among multi-path LEDs is realized by a first level converting circuit; secondly, the current sharing control is automatically realized by the current sharing transformer without an extra control circuit, the reliability is high; thirdly, the efficiency of realizing current sharing is high by the current sharing transformer, the loss of realizing current sharing is less when the dropout voltage of two paths of the LEDs is high.
Description
Technical field
The present invention relates to a kind of circuit that is applicable to the LED multi-path constant-current driving.Should be a kind of equilibrium that realizes the LED multi-path load current by current-sharing transformer specifically.
Background technology
For the application of LED multiple constant current Control Driver, the most frequently used scheme has: 1. constant voltage module+multichannel non-isolation DC/DC constant-current circuit such as BUCK circuit; 2. the adjustable Voltage stabilizing module of voltage+multi-channel linear is adjusted constant-current circuit.
For first kind of scheme, with reference to Fig. 1, the output of constant voltage module is as the input of multiple constant current circuit, and every road constant-current circuit is done constant current control separately, is easy to guarantee the current-sharing of multichannel output current.But because the voltage of constant voltage module and the voltage of LED generally all have bigger pressure reduction, therefore the efficient of back level multichannel DC/DC constant-current circuit can be very not high, and the cost of multichannel constant-current control circuit is very high.
For second kind of scheme, with reference to Fig. 2, do linear the adjustment with metal-oxide-semiconductor or triode and realize multiple constant current control, the output voltage of prime Voltage stabilizing module is followed the linear circuit of adjusting of back level constant current, the output voltage of Voltage stabilizing module makes the linear circuit of adjusting can realize that in the output of every road the power consumption on the basis of accurate constant current control is approaching all the time minimum all the time than the highest Lu Lvegao of output voltage in the multi-channel linear adjustment constant-current circuit.Though this scheme circuit cost is low, the current sharing of every paths of LEDs is good, and short circuit is a LED common failure pattern, and when the pressure reduction of LED multi-path was bigger, the linear power consumption of adjusting pipe was very big, makes the led driver heating serious.
Summary of the invention
The present invention is directed to the problems referred to above, propose a kind of high efficiency, low cost, the well behaved multichannel output of current-sharing LED constant-current control circuit, and when LED multi-path pressure reduction was big, efficient was also higher.
The technical scheme that addresses the above problem employing is: a kind of circuit that is applicable to the LED multi-path constant-current driving, comprise the DC/AC translation circuit, main transformer, current-sharing transformer, multichannel current rectifying and wave filtering circuit and LED load, it is characterized in that described DC/AC translation circuit becomes alternating voltage with the direct voltage of input, this alternating voltage inputs to current-sharing transformer after main transformer is isolated, current-sharing transformer has each road electric current is carried out equilibrium control, after each road current rectifying and wave filtering circuit, export to each paths of LEDs load respectively;
In the two-way load circuit, in main transformer secondary winding and every road current rectifying and wave filtering circuit in-phase current branch road, be connected in series two windings of current-sharing transformer respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively.When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of each road load of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the control to the two-way load current; When m=n, realize the sharing control of two-way load current;
The equilibrium of multichannel loading electric current can be with a plurality of current-sharing transformers according to identical method equilibrium.
When main transformer has a plurality of and load that multichannel is arranged, former limit windings in series, the LED multi-path load current of each main transformer secondary is realized Current Control by a plurality of current-sharing transformers, and the electric current of each main transformer secondary winding is then realized balanced by the control of main transformer no-load voltage ratio.
The present invention is applicable to the circuit of LED multi-path constant-current driving, in the LED load is under the occasion of two-way, a kind of implementation of optimization, the secondary winding of main transformer is a simplex winding, described current-sharing transformer comprises two winding W1 and W2, described current rectifying and wave filtering circuit is a two-way, is respectively current rectifying and wave filtering circuit 1 and current rectifying and wave filtering circuit 2, the secondary side winding W of described main transformer
TThe end of the same name of a termination winding W1 and the non-same polarity of winding W2, the non-same polarity of winding W1 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 1, the end of the same name of winding W2 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 2, rectifying and wave-filtering filter circuit 1 and rectifying and wave-filtering filter circuit 2 connect the two paths of LED load respectively.
In this circuit, the output current i of transformer
W1And i
W2In-phase current flows through two winding W1 of current-sharing transformer and end of the same name and the non-same polarity of W2 respectively.
When the current-sharing transformer turn ratio is W1: W2=1: in the time of 1, if because two paths of LED load voltage Uo1 and Uo2 imbalance cause load current I1 and I2 and current-sharing transformer winding current i
W1And i
W2Uneven, the electric current that flows through current-sharing transformer end of the same name and non-same polarity is unequal, then the exciting curent of current-sharing transformer is non-vanishing, and the alternating voltage that exciting curent produces at the current-sharing transformer two ends makes the two-way current i of current-sharing transformer with the pressure reduction of autobalance two paths of LED
W1And i
W2Balance, thereby the equilibrium of realization load current (I1 and I2).
When the no-load voltage ratio of current-sharing transformer is n: m, flow through the current i of two winding ends of the same name of current-sharing transformer and non-same polarity
W1And i
W2Ratio be not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, and the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of each road load of autobalance, two-way current i
W1And i
W2Current ratio be m: n, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the control to the multichannel loading electric current.
Above-mentioned implementation only is one of the implementation of the flow equalizing circuit of two-way load current, the present invention is the flow equalizing circuit of multichannel loading electric current, for other implementations of two-way load current current-sharing and the equal stream mode of the above load current of two-way, the present invention has detailed illustrating in specific embodiment.
Described DC/AC translation circuit and main transformer can constitute all kinds of bridge-types, recommend, instead swash, forward converter etc.; also can be all kinds of resonant modes or soft switch circuits such as series resonance, LLC; all can be all kinds of DC/AC translation circuits that produce alternating voltage waveform at the transformer two ends with dc voltage conversion; can use, all in the protection range of this patent.
The former limit of transformer winding is not limited to the simplex winding mode, can be to have centre tapped winding construction such as push-pull circuit, other multiple secondary winding.Also can be a plurality of winding parallel-connection structures.Transformer secondary winding also is not limited to the structure of above-mentioned implementation, can be to have centre tapped structure, multiple secondary winding etc.Every range transformer structure can with various rectification circuits in conjunction with constituting halfwave rectifier, full-wave rectification, bridge rectifier, voltage multiplying rectifier doubly flows the application of circuit such as rectification, all within the protection range of this patent.
Beneficial effect of the present invention:
1, realize the equilibrium of load current between LED multi-path by primary conversion circuit, cost is low.
2, the control of current-sharing is realized automatically by current-sharing transformer, does not need extra control circuit, the reliability height.
3, realize the efficient height of current-sharing by current-sharing transformer, even if the loss of the bigger realization current-sharing of two paths of LED pressure reduction is also less.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 prior art circuits block diagram one.
Fig. 2 prior art circuits block diagram two.
Load of Fig. 3 two-way and main transformer secondary are the flow equalizing circuit block diagram of simplex winding.
The secondary winding of load of Fig. 4 two-way and main transformer is doublewound flow equalizing circuit block diagram.
The secondary winding of load of Fig. 5 two-way and main transformer is first kind of flow equalizing circuit block diagram of single centre cap winding.
The secondary winding of load of Fig. 6 two-way and main transformer is second kind of flow equalizing circuit block diagram of single centre cap winding.
The secondary winding of load of Fig. 7 two-way and main transformer is first kind of flow equalizing circuit block diagram of two-way list centre cap winding.
The secondary winding of load of Fig. 8 two-way and main transformer is second kind of flow equalizing circuit block diagram of two-way list centre cap winding.
The secondary winding of Fig. 9 three tunnel loads and main transformer is first kind of flow equalizing circuit block diagram of simplex winding.
The secondary winding of Figure 10 multichannel loading and main transformer is first kind of flow equalizing circuit block diagram of simplex winding.
The secondary winding of Figure 11 multichannel loading and main transformer is the flow equalizing circuit block diagram of many windings.
Its former limit winding of Figure 12 multichannel loading and a plurality of main transformer secondary winding in parallel is the flow equalizing circuit block diagram of simplex winding.
The secondary winding of Figure 13 multichannel loading and main transformer is first kind of flow equalizing circuit block diagram of single centre cap winding.
The secondary winding of Figure 14 multichannel loading and main transformer is second kind of flow equalizing circuit block diagram of single centre cap winding.
The secondary winding of Figure 15 multichannel loading and main transformer is first kind of flow equalizing circuit block diagram of the single centre cap winding of multichannel.
Its former limit winding of Figure 16 multichannel loading and a plurality of main transformer secondary winding in parallel is first kind of flow equalizing circuit block diagram of centre cap winding.
The secondary winding of Figure 17 multichannel loading and main transformer is second kind of flow equalizing circuit block diagram of multichannel centre cap winding.
Its former limit winding of Figure 18 multichannel loading and a plurality of main transformer secondary winding in parallel is second kind of flow equalizing circuit block diagram of centre cap winding.
The secondary winding of Figure 19 three tunnel loads and main transformer is second kind of flow equalizing circuit block diagram of simplex winding.
The secondary winding of Figure 20 multichannel loading and main transformer is second kind of flow equalizing circuit block diagram of simplex winding.
The secondary winding of Figure 21 multichannel loading and main transformer is the third flow equalizing circuit block diagram of single centre cap winding.
The secondary winding of Figure 22 multichannel loading and main transformer is the 4th a kind of flow equalizing circuit block diagram of single centre cap winding.
Its former limit windings in series secondary winding of Figure 23 multichannel loading and a plurality of main transformer is a simplex winding flow equalizing circuit block diagram.
Load of Figure 24 two-way and main transformer secondary are that the flow equalizing circuit main circuit of simplex winding is the specific embodiment of example with the circuit of reversed excitation.
Load of Figure 25 two-way and main transformer secondary are that the flow equalizing circuit main circuit of simplex winding is the specific embodiment of example with the LLC resonant circuit.
Load of Figure 26 two-way and main transformer secondary winding are that first kind of flow equalizing circuit main circuit of single centre cap winding is the specific embodiment of example with the half-bridge circuit.
Specific embodiment
With reference to Fig. 3, a kind of circuit that is applicable to the LED multi-path constant-current driving is under the occasion of two-way in the LED load, and the secondary winding of main transformer is a kind of implementation of simplex winding, it is characterized in that: described current-sharing transformer comprises two winding W1 and W2, the secondary side winding W of described main transformer
TThe end of the same name of a termination winding W1 and the non-same polarity of winding W2, the non-same polarity of winding W1 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 1, the end of the same name of winding W2 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 2, current rectifying and wave filtering circuit 1 and 2 connects the two paths of LED load respectively.
In circuit shown in Figure 3, the output current i of transformer
W1And i
W2Flow through two winding W1 of current-sharing transformer and end of the same name and the non-same polarity of W2 respectively.
When the current-sharing transformer turn ratio is W1: W2=1: in the time of 1, if because two paths of LED load voltage Uo1 and Uo2 imbalance cause load current I1 and I2 and current-sharing transformer winding current i
W1And i
W2Imbalance, the electric current that flows through current-sharing transformer end of the same name and non-same polarity is unequal, and then the exciting curent of current-sharing transformer is non-vanishing, and the alternating voltage that exciting curent produces at the current-sharing transformer two ends makes the two-way current i with the pressure reduction of autobalance two paths of LED
W1And i
W2Balance, thereby the equilibrium of realization load current (I1 and I2).
When the no-load voltage ratio of current-sharing transformer is n: m, according to the null characteristic of desirable transformation number of ampere turns, two-way current i
W1And i
W2Current ratio be m: n.
With reference to Fig. 4, a kind of circuit that is applicable to the LED multi-path constant-current driving, in the LED load is under the occasion of two-way, the secondary winding of main transformer is doublewound first kind of implementation, it is characterized in that: described current-sharing transformer comprises two winding W1 and W2, and the secondary side winding of described main transformer is winding W
T1And W
T2, winding W
T1The end of the same name of termination winding W1 of the same name, winding W
T1Non-same polarity and the non-same polarity of winding W1 as the input of current rectifying and wave filtering circuit 1; Winding W
T2The non-same polarity of termination winding W2 of the same name, winding W
T1Non-same polarity and the end of the same name of winding W2 as the input of current rectifying and wave filtering circuit 2, current rectifying and wave filtering circuit 1 and 2 connects the two paths of LED load respectively.
The current-sharing effect and the described principle of Fig. 3 circuit of the described current-sharing transformer of Fig. 4 are basic identical.
With reference to Fig. 5, a kind of circuit that is applicable to the LED multi-path constant-current driving, in the LED load is under the occasion of two-way, the secondary winding of main transformer is first kind of implementation of single centre cap winding, it is characterized in that: described current-sharing transformer comprises four winding W1, W2, W3 and W4, the end of the same name of the secondary side winding of described main transformer termination winding of the same name W1 and the non-same polarity of winding W3, the non-same polarity of the secondary side winding of main transformer connects the non-same polarity of winding W2 and the end of the same name of winding W4, the end of the same name of the non-same polarity of winding W1 and winding W2 and the secondary side winding center tap terminal of main transformer are as the input of current rectifying and wave filtering circuit 1, the secondary side winding center tap terminal of the end of the same name of winding W3 and the non-same polarity of winding W4 and main transformer is as the input of current rectifying and wave filtering circuit 2, and current rectifying and wave filtering circuit 1 and 2 connects the two paths of LED load respectively.
The current-sharing effect of the described current-sharing transformer of Fig. 5 is identical with the described principle of Fig. 1 embodiment, and different is: because the secondary winding of main transformer is single centre cap type, and its centre tapped two winding alternations up and down.The winding W1 of current-sharing transformer and W3 realize current-sharing when cooperating in the output of main transformer winding work, and winding W2 and W4 realize current-sharing when cooperating under the output of main transformer winding work.
With reference to Fig. 6, a kind of circuit that is applicable to the LED multi-path constant-current driving is under the occasion of two-way in the LED load, and the secondary winding of main transformer is second kind of implementation of single centre cap winding.Described main transformer is output as the winding of single centre cap type, and described current-sharing transformer comprises two windings equally, and is connected on respectively on the centre cap line, and end of the same name is opposite.Described transformer secondary current i
W1And i
W2Flow through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively, its equal stream mode is similar to the current-sharing principle of circuit shown in Figure 3.
With reference to Fig. 7, a kind of circuit that is applicable to the LED multi-path constant-current driving is under the occasion of two-way in the LED load, and the secondary winding of main transformer is first kind of implementation of two-way list centre cap winding.Described main transformer secondary is output as the winding of two centre cap types, and described current-sharing transformer comprises four windings and similar with the described connected mode of Fig. 5 equally.The current-sharing effect and the described principle of Fig. 5 embodiment of the described current-sharing transformer of Fig. 7 are basic identical.
With reference to Fig. 8, a kind of circuit that is applicable to the LED multi-path constant-current driving is under the occasion of two-way in the LED load, and the secondary winding of main transformer is second kind of implementation of two-way list centre cap winding.Described main transformer secondary is output as the winding of two centre cap types, and described current-sharing transformer comprises two windings equally, and is connected on respectively on the centre cap line, and end of the same name is opposite.Described transformer secondary current i
W1And i
W2Flow through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively, its equal stream mode is similar to the current-sharing principle of circuit shown in Figure 3.
With reference to Fig. 9, a kind of circuit that is applicable to the LED multi-path constant-current driving, be under three tunnel the occasion in the LED load, the secondary winding of main transformer is first kind of implementation of simplex winding, it is characterized in that: described current-sharing transformer is T1 and T2, comprise two winding W1, W2 and W3, W4 respectively, the secondary side winding of described main transformer is winding W
T, winding W
TEnd of the same name and the non-same polarity of winding W2 and the non-same polarity of winding W4 of a termination winding W1, the non-same polarity of winding W1 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 1; The end of the same name of the termination winding W3 of the same name of winding W2, the non-same polarity of winding W3 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 2; The end of the same name of winding W4 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 3; Current rectifying and wave filtering circuit 1,2 and 3 connects LED load 1,2 and 3 respectively.
Circuit shown in Figure 9 is the flow equalizing circuit of three paths of LEDs loads, current-sharing transformer T1 realizes the current-sharing of the electric current of LED load 1 and LED load 2, current-sharing transformer T2 realizes the current-sharing of the electric current of LED load 2 and LED load 3, realize the current-sharing of LED load 1 and LED load 3 indirectly, thereby realized three tunnel current-sharings.
The multichannel loading electric current flow equalizing circuit of Figure 10-shown in Figure 180 by first kind of implementation of the flow equalizing circuit of three tunnel loads shown in Figure 9 respectively and Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, the described combination of circuits of Fig. 8 is expanded, that is: establishing multichannel is N road N 〉=3, comprise N-1 current-sharing transformer T1, T2 ... T
N-1, each current-sharing transformer is all realized the current-sharing of two-way load, thereby realizes the current-sharing between the load current of N road.
Figure 10 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is first kind of implementation of simplex winding.
Figure 11 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is a kind of implementation of many windings.
Figure 12 is the multichannel loading flow equalizing circuit, and main transformer is a plurality of transformers, and winding secondary winding in parallel in former limit is a kind of implementation of many windings.
Figure 13 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is first kind of implementation of single centre cap winding.
Figure 14 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is second kind of implementation of single centre cap winding.
Figure 15 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is first kind of implementation of the single centre cap winding of multichannel.
Figure 16 is the multichannel loading flow equalizing circuit, and main transformer is a plurality of transformers, first kind of implementation that winding secondary winding in parallel in former limit is the single centre cap winding of multichannel.
Figure 17 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is second kind of implementation of the single centre cap winding of multichannel.
Figure 18 is the multichannel loading flow equalizing circuit, and main transformer is a plurality of transformers, second kind of implementation that winding secondary winding in parallel in former limit is the single centre cap winding of multichannel.
With reference to Figure 19, a kind of circuit that is applicable to the LED multi-path constant-current driving, be under three tunnel the occasion in the LED load, the secondary winding of main transformer is second kind of implementation of simplex winding, it is characterized in that: described current-sharing transformer is T1 and T2, comprise two winding W1, W2 and W3, W4 respectively, the secondary side winding of described main transformer is winding W
T, winding W
TThe end of the same name of a termination winding W1 and the non-same polarity of winding W2, the non-same polarity of winding W1 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 1; The end of the same name of the termination winding W3 of the same name of winding W2 and the non-same polarity of winding W4, the non-same polarity of winding W3 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 2; The end of the same name of winding W4 and winding W
TThe other end as the input of current rectifying and wave filtering circuit 3; Current rectifying and wave filtering circuit 1,2 and 3 connects LED load 1,2 and 3 respectively.
Circuit shown in Figure 19 is the flow equalizing circuit of three paths of LEDs loads, current-sharing transformer T2 realizes the current-sharing of the electric current of LED load 2 and LED load 3, current-sharing transformer T1 realizes the electric current of LED load 1 and the current-sharing of LED load 2 and 3 total currents, so this circuit is the current-sharing that has realized two-way load in three tunnel loads, realize the total current of this two-way load current and the current-sharing of Third Road load current then, thereby realize three tunnel current-sharings.
Multichannel loading electric current flow equalizing circuit shown in Figure 20-22 by second kind of implementation of the flow equalizing circuit of three tunnel loads shown in Figure 19 respectively and Fig. 3, Fig. 5, the described combination of circuits of Fig. 6 is expanded, that is: establishing multichannel is N road N 〉=3, comprise N-1 current-sharing transformer T1, T2 ... T
N-1Wherein first current-sharing transformer is realized the current-sharing of two-way load, second current-sharing transformer realized the current-sharing of this two-way load total current and Third Road load current, by that analogy, N-1 current-sharing transformer realized the current-sharing of front N-2 road load total current and last road load current, thereby realizes the current-sharing between the load current of N road.
Figure 20 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is second kind of implementation of simplex winding.
Figure 21 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is the third implementation of single centre cap winding.
Figure 22 is the multichannel loading flow equalizing circuit, and the secondary winding of main transformer is the 4th a kind of implementation of single centre cap winding.
In the circuit shown in above-mentioned Figure 20-22, when N＞3, its equal stream mode can be mixed in conjunction with Fig. 9 and the described two kinds of equal stream modes of Figure 19 and used.In the circuit shown in Figure 20-22, greater than the equal stream mode of three tunnel loads, in conjunction with the equal stream mode of all permutation and combination of Fig. 9 and Figure 19 all within this patent protection range.
With reference to Figure 23, a kind of circuit that is applicable to the LED multi-path constant-current driving, in the LED load is under the occasion of multichannel, main transformer is a plurality of transformers, a kind of implementation of former limit windings in series secondary winding multichannel winding, the equal stream mode of its secondary load is expanded by Fig. 9 and the described equal stream mode of Figure 19.It is characterized in that: establishing main transformer is N, and the former limit windings in series of N main transformer, and all possible single channel of each main transformer secondary output or multichannel loading are as transformer T1 secondary winding R current rectifying and wave filtering circuit in parallel and R load.Wherein, the multichannel loading of each transformers connected in parallel, the equal stream mode of all permutation and combination that its equal stream mode can be Fig. 9 and Figure 19, every road load current is realized Current Control by current-sharing transformer, and the total current of each main transformer secondary winding then realizes current balance by the control of main transformer no-load voltage ratio.
With reference to Figure 24, a kind of circuit that is applicable to the LED multi-path constant-current driving is under the occasion of two-way in the LED load, and the main transformer secondary is the flow equalizing circuit of simplex winding, main circuit is the specific embodiment of example with the circuit of reversed excitation, and specifically: described current-sharing transformer T2 comprises two winding W1 and W2.Direct voltage Vdc is as the input of circuit, the former limit winding non-same polarity of its positive termination main transformer T1, first end of the termination switching tube S1 of the same name of T1, the negative terminal of the second termination direct voltage Vdc of switching tube S1, its Drive and Control Circuit of the 3rd termination of switching tube S1; Main transformer T1 secondary winding W
TThe end of the same name of termination winding W1 of the same name and the non-same polarity of winding W2, the non-same polarity of winding W1 connects the anode of diode D1, the negative electrode of diode D1 connects an end of capacitor C 1 and the anode of LED load 1, another termination winding W of capacitor C 1
TNon-same polarity and the negative terminal of LED load 1; The anode of the terminating diode D2 of the same name of winding W2, the negative electrode of diode D2 connect an end of capacitor C 2 and the anode of LED load 2, another termination winding W of capacitor C 2
TNon-same polarity and the negative terminal of LED load 2.
With reference to Figure 25, a kind of circuit that is applicable to the LED multi-path constant-current driving, in the LED load is under the occasion of two-way, the main transformer secondary is the flow equalizing circuit of simplex winding, main circuit is the specific embodiment of example with the LLC resonant circuit, and specifically: described current-sharing transformer T2 comprises two winding W1 and W2.Direct voltage Vdc is as the input of circuit, first end of its positive termination switching tube S1, first end of the second termination switching tube S2 of switching tube S1 and an end of inductance L 1, the negative terminal of the second termination direct voltage Vdc of switching tube S2 and an end of capacitor C 1, the 3rd end of switching tube S1 and S2 all connects Drive and Control Circuit, the former limit winding end of the same name of another termination main transformer T1 of inductance L 1, the non-same polarity of T1 connects the other end of capacitor C 1; Main transformer T1 secondary winding W
TThe end of the same name of termination winding W1 of the same name and the non-same polarity of winding W2, the non-same polarity of winding W1 connects the anode of diode D1 and the negative electrode of diode D2, the negative electrode of diode D1 meets an end of capacitor C 2 and the anode of LED load 1, an end of another termination capacitor C 3 of capacitor C 2 and winding W
TNon-same polarity, the anode of another terminating diode D2 of capacitor C 3 and the negative terminal of LED load 1; The anode of the terminating diode D3 of the same name of winding W2 and the negative electrode of diode D4, the negative electrode of diode D3 meet an end of capacitor C 4 and the anode of LED load 2, an end of another termination capacitor C 5 of capacitor C 4 and winding W
TNon-same polarity, the anode of another terminating diode D4 of capacitor C 5 and the negative terminal of LED load 2.
A kind of circuit that is applicable to the LED multi-path constant-current driving of Figure 26, in the LED load is under the occasion of two-way, the main transformer secondary is the flow equalizing circuit of single centre cap winding, main circuit is the specific embodiment of example with the half-bridge circuit, specifically: described current-sharing transformer T2 comprises two winding W1, W2, W3 and W4, and described main transformer secondary comprises W for the centre cap winding
T1And W
T2, winding W
T1Non-same polarity W
T2End of the same name link to each other i.e. center tap terminal.Direct voltage Vdc is as the input of circuit, first end of its positive termination switching tube S1 and an end of capacitor C 1, the former limit winding non-same polarity of first end of the second termination switching tube S2 of switching tube S1 and main transformer T1, the negative terminal of the second termination direct voltage Vdc of switching tube S2 and an end of capacitor C 2, the former limit winding end of the same name of the other end of another termination capacitor C 1 of capacitor C 2 and main transformer T1, the 3rd end of switching tube S1 and S2 all connects Drive and Control Circuit; Main transformer T1 secondary winding W
T1The end of the same name of termination winding W1 of the same name and the non-same polarity of winding W3, winding W
T2Non-same polarity connect the non-same polarity of winding W2 and the end of the same name of winding W4, the non-same polarity of winding W1 connects the anode of diode D1, the anode of the terminating diode D2 of the same name of winding W2, the anode of the terminating diode D3 of the same name of winding W3, the non-same polarity of winding W4 connects the anode of diode D4, the negative electrode of diode D1 connects the negative electrode of diode D2 and an end of inductance L 1, one end of another termination capacitor C 3 of inductance L 1 and the anode of LED load 1, the negative terminal and the winding W of another termination LED load 1 of capacitor C 3
T1Non-same polarity, the negative electrode of diode D3 connects the negative electrode of diode D4 and an end of inductance L 2, an end of another termination capacitor C 4 of inductance L 2 and the anode of LED load 2, the negative terminal and the winding W of another termination LED load 2 of capacitor C 4
T2End of the same name.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought the protection range of inventing.
Claims (12)
1. circuit that is applicable to the LED multi-path constant-current driving, comprise the DC/AC translation circuit, main transformer, current-sharing transformer, multichannel current rectifying and wave filtering circuit and LED load, it is characterized in that described DC/AC translation circuit becomes alternating voltage with the direct voltage of input, this alternating voltage is after main transformer is isolated, and main transformer secondary winding is as alternating current source, through current-sharing transformer, after the current rectifying and wave filtering circuit, export to the LED multi-path electric respectively;
In the two-way load circuit, in main transformer secondary winding and every road current rectifying and wave filtering circuit in-phase current branch road, be connected in series two windings of current-sharing transformer respectively, the two-way in-phase current flows through the end of the same name and the non-same polarity of two windings of current-sharing transformer respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of each road load of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the control to the two-way load current; When m=n, realize the sharing control of two-way load current;
The equilibrium of multichannel loading electric current adopts a plurality of current-sharing transformers according to identical method equilibrium.
2. circuit that is applicable to the LED multi-path constant-current driving, comprise the DC/AC translation circuit, main transformer, current-sharing transformer, multichannel current rectifying and wave filtering circuit and LED load, it is characterized in that described DC/AC translation circuit becomes alternating voltage with the direct voltage of input, this alternating voltage is after main transformer is isolated, and main transformer secondary winding is as alternating current source, through current-sharing transformer, after the current rectifying and wave filtering circuit, export to the LED multi-path electric respectively;
In the two-way load circuit, in main transformer secondary winding and every road current rectifying and wave filtering circuit in-phase current branch road, be connected in series the current-sharing transformer winding respectively, in-phase current flows through the end of the same name and the non-same polarity of current-sharing transformer winding respectively; When the no-load voltage ratio of current-sharing transformer is n: m, the ratio that flows through the electric current of two winding ends of the same name of current-sharing transformer and non-same polarity is not equal to m: during n, then the exciting curent of current-sharing transformer is non-vanishing, the alternating voltage that exciting curent produces at the current-sharing transformer two ends is with the pressure reduction of each road load of autobalance, making the ratio balance of two winding currents of current-sharing transformer is m: n, thereby realizes the control to the two-way load current; When m=n, realize the sharing control of two-way load current;
When main transformer has a plurality of and load that multichannel is arranged, former limit windings in series, the LED multi-path load current of each main transformer secondary is realized Current Control by a plurality of current-sharing transformers, and the electric current of each main transformer secondary winding is then realized balanced by the control of main transformer no-load voltage ratio.
3. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 1 is characterized in that main transformer is one or more, and when main transformer when being a plurality of, former limit winding is a parallel way.
4. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 1 is characterized in that main transformer secondary winding is simplex winding structure, the centre tapped structure of tool or multiple secondary winding.
5. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 2 is characterized in that main transformer secondary winding is simplex winding structure, the centre tapped structure of tool or multiple secondary winding.
6. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 1 is characterized in that the former limit of main transformer winding is the simplex winding structure, has centre tapped structure or a multiple secondary winding.
7. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 2 is characterized in that the former limit of main transformer winding is the simplex winding structure, has centre tapped structure or a multiple secondary winding.
8. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 1 is characterized in that described current-sharing transformer is one or more.
9. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 2 is characterized in that described current-sharing transformer is one or more.
10. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 1 is characterized in that described current-sharing transformer has one or more pairs of windings.
11. the circuit that is applicable to the LED multi-path constant-current driving as claimed in claim 2 is characterized in that described current-sharing transformer has one or more pairs of windings.
12., it is characterized in that the DC/AC translation circuit is bridge circuit, push-pull circuit, circuit of reversed excitation, normal shock, series resonant circuit, LLC class resonant circuit or soft switch circuit any circuit structure wherein as any one described circuit that is applicable to the LED multi-path constant-current driving of claim 1-11.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910225966A CN101702854A (en) | 2009-11-21 | 2009-11-21 | Circuit for multi-path LED constant current driving |
| CN2010102464943A CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
| CN2010202833178U CN201766747U (en) | 2009-11-21 | 2010-08-03 | Multiple constant-current driving circuit |
| CN2010202833318U CN201766748U (en) | 2009-11-21 | 2010-08-03 | Multichannel constant current driving circuit |
| CN2010102464799A CN101902859B (en) | 2009-11-21 | 2010-08-03 | Multi-path constant-current drive circuit |
| US13/511,049 US9155141B2 (en) | 2009-11-21 | 2010-11-15 | Multi-path constant current driving circuit |
| PCT/CN2010/078716 WO2011060701A1 (en) | 2009-11-21 | 2010-11-15 | Multi-path constant current driving circuit |
| US13/511,059 US8629664B2 (en) | 2009-11-21 | 2010-11-15 | Multi-path constant current driving circuit |
| PCT/CN2010/078714 WO2011060700A1 (en) | 2009-11-21 | 2010-11-15 | Multi-path constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910225966A CN101702854A (en) | 2009-11-21 | 2009-11-21 | Circuit for multi-path LED constant current driving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101702854A true CN101702854A (en) | 2010-05-05 |
Family
ID=42157738
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910225966A Pending CN101702854A (en) | 2009-11-21 | 2009-11-21 | Circuit for multi-path LED constant current driving |
| CN2010102464943A Active CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
| CN2010102464799A Ceased CN101902859B (en) | 2009-11-21 | 2010-08-03 | Multi-path constant-current drive circuit |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102464943A Active CN101902860B (en) | 2009-11-21 | 2010-08-03 | Multipath constant-current driving circuit |
| CN2010102464799A Ceased CN101902859B (en) | 2009-11-21 | 2010-08-03 | Multi-path constant-current drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN101702854A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101902859A (en) | 2010-12-01 |
| CN101902860B (en) | 2013-01-16 |
| CN101902860A (en) | 2010-12-01 |
| CN101902859B (en) | 2012-12-12 |
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