CN101707838B - Multipath LED constant current drive circuit suitable for non-isolated converter - Google Patents
Multipath LED constant current drive circuit suitable for non-isolated converter Download PDFInfo
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Abstract
The invention discloses a multipath LED constant current drive circuit suitable for a non-isolated converter, which comprises a DC/AC converting circuit, a current-equalizing transformer, rectifier filter circuits and LED loads. The multipath LED constant current drive circuit is characterized in that the DC/AC converting circuit converts the input direct voltage into alternating voltage, and thealternating voltage is input to the current-equalizing transformer; the current-equalizing transformer performs balancing control on each path of current; and after passing through each rectifier filter circuit, the current is output to each LED load respectively. The multipath LED constant current drive circuit has the advantages that: 1, the current-equalizing transformer realizes the equalization of a plurality of paths of LED load current, and the cost is low; 2, the current equalization control is realized by the current-equalizing transformer automatically without additional control circuits, and the circuit is simple and has high reliability; and 3, the current-equalizing transformer has a high efficiency to achieve the current equalization, and even the voltage difference of two paths of LEDs is large, the consumption for realizing the current equalization is small.
Description
Technical field
The present invention relates to a kind of multipath LED constant current drive circuit that is applicable to non-isolated converter, should be a kind of being used for to realize the balanced circuit of non-isolated converter LED multi-path load current through current-sharing transformer specifically.
Background technology
Application for the LED multiple constant current Control Driver of non-isolated converter; Non-isolation DC/DC constant-current circuit (like the BUCK circuit) that the most frequently used scheme is to use multichannel independently to control; With reference to Fig. 1, every road DC/DC circuit is done constant current control separately, is easy to guarantee the current-sharing of multichannel output current; But because every paths of LEDs is all realized constant-current driving by independently converter and control circuit, complicated circuit, cost height, reliability are low.
Summary of the invention
The present invention is directed to the problem that prior art exists, propose a kind of high efficiency, low cost, current-sharing is functional, is applicable to the multichannel output LED constant-current control circuit of non-buffer circuit.
The technical scheme that addresses the above problem employing is: a kind of multipath LED constant current drive circuit that is applicable to non-isolated converter comprises the DC/AC translation circuit, current-sharing transformer; Current rectifying and wave filtering circuit, the LED load 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; Current-sharing transformer has each road electric current is carried out equilibrium control, after each road current rectifying and wave filtering circuit, exports to each paths of LEDs load respectively;
In the two paths of LED load circuit, in the output of DC/AC translation circuit 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, and 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 use a plurality of current-sharing transformers balanced according to identical method.
Described DC/AC translation circuit can be traditional half-bridge or full-bridge circuit; Also can be LLC resonance; LCC resonance, all kinds of resonant modes or soft switch circuits such as LC resonance, all can be all kinds of DC/AC translation circuits in alternating voltage waveform with dc voltage conversion; Can use, all in the protection range of this patent.
Current rectifying and wave filtering circuit can be a bridge rectifier, and voltage multiplying rectifier doubly flows various current rectifying and wave filtering circuits such as rectification, and every all kinds of current rectifying and wave filtering circuits that convert alternating voltage into direct voltage are all within the protection range of this patent.
The present invention utilizes current-sharing transformer to realize that the thinking of the balanced control of LED multi-path load current can be extended to BUCK; BOOST; BUCK-BOOST, CUK is in the DC/DC converters such as SEPIC; Through switching tube with (or) current-sharing transformer of connecting in the diode branch, utilize identical principle to realize the current-sharing of LED multi-path load.Detailed illustrating arranged in the specific embodiment.
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; Described current-sharing transformer comprises two winding W1 and W2, the end of the same name of an output termination winding W1 of described DC/AC translation circuit and the non-same polarity of winding W2, and another output of the non-same polarity of winding W1 and DC/AC translation circuit is as the input of current rectifying and wave filtering circuit 1; The end of the same name of winding W2 and another output of DC/AC translation circuit are as the input of current rectifying and wave filtering circuit 2, and rectifying and wave-filtering filter circuit 1 and 2 connects the two paths of LED load respectively.
In this circuit, DC/AC inverter output current (i
W1And i
W2) flow 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, cause load current I1 and I2 and current-sharing transformer winding current i because two paths of LED load voltage Uo1 and Uo2 are uneven
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.
Beneficial effect of the present invention:
1, realize the equilibrium of LED multi-path load current through current-sharing transformer, cost is low.
2, sharing control is realized by current-sharing transformer automatically, does not need additional control circuit, and circuit is simple, reliability is high.
3, realize that through current-sharing transformer the efficient of current-sharing is high, even if the loss of the bigger realization current-sharing of two paths of LED pressure reduction is also less.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 prior art circuits block diagram one.
Fig. 2 two-way load flow equalizing circuit block diagram.
Fig. 3 three tunnel load flow equalizing circuit block diagrams one.
Fig. 4 three tunnel load flow equalizing circuit block diagrams two.
Fig. 5 multichannel loading flow equalizing circuit block diagram one.
Fig. 6 multichannel loading flow equalizing circuit block diagram two.
Load of Fig. 7 two-way and main circuit topology are the flow equalizing circuit of Boost circuit.
Load of Fig. 8 two-way and main circuit topology are the flow equalizing circuit of Buck_Boost circuit.
Load of Fig. 9 two-way and main circuit topology are the flow equalizing circuit of non-isolation LLC resonant circuit.
Load of Figure 10 two-way and main circuit topology are the flow equalizing circuit of non-isolation LCC resonant circuit.
Load of Figure 11 two-way and main circuit topology are the flow equalizing circuit of non-isolation LC resonant circuit.
Load of Figure 12 two-way and main circuit topology are the flow equalizing circuit of non-isolated half-bridge circuit.
Specific embodiment
With reference to Fig. 2; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter; In the LED load is under the occasion of two-way; It is characterized in that: described DC/AC translation circuit be input as direct voltage Vdc; Described current-sharing transformer comprises two winding W1 and W2, the end of the same name of an output termination winding W1 of described DC/AC translation circuit and the non-same polarity of winding W2, and another output of the non-same polarity of winding W1 and DC/AC translation circuit is as the input of current rectifying and wave filtering circuit 1; The end of the same name of winding W2 and another output of DC/AC translation circuit are as the input of current rectifying and wave filtering circuit 2, and rectifying and wave-filtering filter circuit 1 and 2 connects the two paths of LED load respectively.
In circuit shown in Figure 2, DC/AC inverter output current (i
W1And i
W2) flow 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 causes load current (I1 and I2) and current-sharing transformer winding current (i
W1And i
W2) imbalance, 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 two-way electric current (i with the pressure reduction of autobalance two paths of LED
W1And i
W2) balance, 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 electric current (i
W1And i
W2) current ratio be m: n.
With reference to Fig. 3; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter; Be that first kind of circuit is characterized in that under three tunnel the occasion in the LED load: described DC/AC translation circuit be input as direct voltage Vdc; Described current-sharing transformer is T1 and T2; Comprise two winding W1, W2 and W3, W4 respectively, end of the same name and the non-same polarity of winding W2 and the non-same polarity of winding W4 of an output termination winding W1 of described DC/AC translation circuit, another output of the non-same polarity of winding W1 and DC/AC translation circuit is 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, another output of the non-same polarity of winding W3 and DC/AC translation circuit is as the input of current rectifying and wave filtering circuit 2; The end of the same name of winding W4 and another output of DC/AC translation circuit are 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 3 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.
With reference to Fig. 4; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter; Be that first kind of circuit is characterized in that under three tunnel the occasion in the LED load: described DC/AC translation circuit be input as direct voltage Vdc; Described current-sharing transformer is T1 and T2; Comprise two winding W1, W2 and W3, W4 respectively, the end of the same name of an output termination winding W1 of described DC/AC translation circuit and the non-same polarity of winding W2, another output of the non-same polarity of winding W1 and DC/AC translation circuit is 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, another output of the non-same polarity of winding W3 and DC/AC translation circuit is as the input of current rectifying and wave filtering circuit 2; The end of the same name of winding W4 and another output of DC/AC translation circuit are 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 4 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, realizes 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.
With reference to Fig. 5; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is first kind of circuit under the occasion of multichannel in the LED load, is expanded by first kind of flow equalizing circuit of described three road load currents of Fig. 3; 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.
With reference to Fig. 6; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is second kind of circuit under the occasion of multichannel in the LED load, is expanded by described three road load current flow equalizing circuits of Fig. 4; 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.
With reference to Fig. 7; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter; In the LED load is under the occasion of two-way, and main circuit topology is the flow equalizing circuit of Boost circuit, it is characterized in that: an end of the positive termination inductance L 1 of described direct voltage Vdc; First end of another termination switching tube S1 of inductance L 1 and the winding W1 end of the same name of current-sharing transformer and the non-same polarity of winding W2; The non-same polarity of winding W1 connects the anode of diode D1, and the anode of the termination diode D2 of the same name of winding W2, the negative electrode of diode D1 and D2 connect the anode of capacitor C 1 and C2 and the anode of LED load 1 and LED load 2 respectively; The negative terminal of the second termination direct voltage Vdc of switching tube S1, the negative terminal of capacitor C 1, C2 and LED load 1 and 2.
With reference to Fig. 8; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter; In the LED load is under the occasion of two-way, and main circuit topology is the flow equalizing circuit of Buck_Boost circuit, it is characterized in that: first end of the positive termination switching tube S1 of described direct voltage Vdc; One end of the second termination inductance L 1 of switching tube S1 and the winding W1 end of the same name of current-sharing transformer and the non-same polarity of winding W2; The non-same polarity of winding W1 connects the negative electrode of diode D1, and the negative electrode of the termination diode D2 of the same name of winding W2, the anode of diode D1 and D2 connect the anode of capacitor C 1 and C2 and the anode of LED load 1 and LED load 2 respectively; The negative terminal of another termination direct voltage Vdc of inductance L 1, the negative terminal of capacitor C 1, C2 and LED load 1 and 2.
With reference to Fig. 9, a kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is under the occasion of two-way in the LED load; Main circuit topology is the flow equalizing circuit of non-isolation LLC resonant circuit, and it is characterized in that: the winding of current-sharing transformer is W1 and W2, first end of the positive termination switching tube S1 of described direct voltage Vdc; 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, an end of another termination capacitor C 1 of inductance L 1, an end of another termination inductance L 2 of capacitor C 1; The winding W1 end of the same name of current-sharing transformer; With the non-same polarity of the winding W2 of current-sharing transformer, the non-same polarity of winding W1 connects the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of diode D1 connects the anode of capacitor C 2 and the anode of LED load 1; The anode of diode D2 connects the negative terminal of capacitor C 3 and the negative terminal of LED load 1; The negative terminal of capacitor C 2 connects the anode and the direct voltage Vdc negative terminal of capacitor C 3, and the anode of the termination diode D3 of the same name of winding W2 and the negative electrode of diode D4, the negative electrode of diode D3 connect the anode of capacitor C 4 and the anode of LED load 2; The anode of diode D4 connects the negative terminal of capacitor C 5 and the negative terminal of LED load 2, and the negative terminal of capacitor C 4 connects the anode and the direct voltage Vdc negative terminal of capacitor C 5.
With reference to Figure 10, a kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is under the occasion of two-way in the LED load; Main circuit topology is the flow equalizing circuit of non-isolation LCC resonant circuit, and it is characterized in that: the winding of current-sharing transformer is W1 and W2, first end of the positive termination switching tube S1 of described direct voltage Vdc; 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, an end of another termination capacitor C 1 of inductance L 1; One end of another termination capacitor C 2 of capacitor C 1; The negative terminal of another termination direct voltage Vdc of capacitor C 2, the non-same polarity of the winding W1 end of the same name of current-sharing transformer and the winding W2 of current-sharing transformer; 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 connects the anode of capacitor C 3 and the anode of LED load 1, and the anode of diode D2 connects the negative terminal of capacitor C 4 and the negative terminal of LED load 1, and the negative terminal of capacitor C 3 connects the anode and the direct voltage Vdc negative terminal of capacitor C 4; The anode of the termination diode D3 of the same name of winding W2 and the negative electrode of diode D4; The negative electrode of diode D3 connects the anode of capacitor C 5 and the anode of LED load 2, and the anode of diode D4 connects the negative terminal of capacitor C 6 and the negative terminal of LED load 2, and the negative terminal of capacitor C 5 connects the anode and the direct voltage Vdc negative terminal of capacitor C 6.
With reference to Figure 11; A kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is under the occasion of two-way in the LED load, and main circuit topology is the flow equalizing circuit of non-isolation LC resonant circuit; It is characterized in that: the winding of current-sharing transformer is W1 and W2; First end of the positive termination switching tube S1 of described direct voltage Vdc, 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; One end of another termination capacitor C 1 of inductance L 1; The winding W1 end of the same name of another termination current-sharing transformer of capacitor C 1 and the non-same polarity of winding W2, the non-same polarity of winding W1 connect the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of diode D1 connects the anode of capacitor C 2 and the anode of LED load 1; The anode of diode D2 connects the negative terminal of capacitor C 3 and the negative terminal of LED load 1; The negative terminal of capacitor C 2 connects the anode and the direct voltage Vdc negative terminal of capacitor C 3, and the anode of the termination diode D3 of the same name of winding W2 and the negative electrode of diode D4, the negative electrode of diode D3 connect the anode of capacitor C 4 and the anode of LED load 2; The anode of diode D4 connects the negative terminal of capacitor C 5 and the negative terminal of LED load 2, and the negative terminal of capacitor C 4 connects the anode and the direct voltage Vdc negative terminal of capacitor C 5.
With reference to Figure 12, a kind of circuit that is applicable to the LED multi-path constant-current driving of non-isolated converter is under the occasion of two-way in the LED load; Main circuit topology is the flow equalizing circuit of non-isolated half-bridge circuit; It is characterized in that: the winding of current-sharing transformer is W1 and W2, first end of the positive termination switching tube S1 of described direct voltage Vdc, first end of the second termination switching tube S2 of switching tube S1 and an end of capacitor C 1; The negative terminal of the second termination direct voltage Vdc of switching tube S2; The winding W1 end of the same name of another termination current-sharing transformer of capacitor C 1 and the non-same polarity of winding W2, the non-same polarity of winding W1 connect the anode of diode D1 and the negative electrode of diode D2, and the negative electrode of diode D1 connects the anode of capacitor C 2 and an end of inductance L 1; The anode of another termination LED load 1 of inductance L 1; The anode of diode D2 connects the negative terminal of capacitor C 3 and the negative terminal of LED load 1, and the negative terminal of capacitor C 2 connects the anode and the direct voltage Vdc negative terminal of capacitor C 3, the anode of the termination diode D3 of the same name of winding W2 and the negative electrode of diode D4; The negative electrode of diode D3 connects the anode of capacitor C 4 and an end of inductance L 2; The anode of another termination LED load 2 of inductance L 2, the anode of diode D4 connects the negative terminal of capacitor C 5 and the negative terminal of LED load 2, and the negative terminal of capacitor C 4 connects the anode and the direct voltage Vdc negative terminal of capacitor C 5.
In the described circuit of Figure 12 when the PWM duty ratio for fixing 50% the time, output inductor L1 and inductance L 2 can be removed.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the present 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 (7)
1. a multipath LED constant current drive circuit that is applicable to non-isolated converter comprises the DC/AC translation circuit, 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, and current-sharing transformer has and each road electric current is carried out equilibrium controls; After each current rectifying and wave filtering circuit, export unidirectional current respectively and give each paths of LEDs electric;
In the two paths of LED load circuit; First winding of serial connection current-sharing transformer between the input of the output of DC/AC and first via current rectifying and wave filtering circuit; Second winding of serial connection current-sharing transformer between the said output of DC/AC and the input of the second road current rectifying and wave filtering circuit; In the two-way in-phase current by said output output of DC/AC; One road electric current flows through the end of the same name of first winding of current-sharing transformer, and another road electric current flows through the non-same polarity of second winding of current-sharing transformer; When the no-load voltage ratio of current-sharing transformer is n:m; When the electric current that flows through first winding of current-sharing transformer end of the same name is not equal to m:n with the ratio that flows through the electric current of second winding non-same polarity of current-sharing transformer; 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 autobalance two paths of LED load, and making the ratio balance of two winding currents of current-sharing transformer is m:n, thereby realizes the equilibrium control to the two paths of LED load current; When m=n, realize the sharing control of two paths of LED load current;
In the LED multi-path load circuit; For adjacent two-way current rectifying and wave filtering circuit; First winding of serial connection current-sharing transformer between the input of the output of DC/AC and first via current rectifying and wave filtering circuit; Second winding of serial connection current-sharing transformer between the said output of DC/AC and the input of the second road current rectifying and wave filtering circuit; In the two-way in-phase current by said output output of DC/AC, one road electric current flows through the end of the same name of first winding of current-sharing transformer, and another road electric current flows through the non-same polarity of second winding of current-sharing transformer; When the no-load voltage ratio of current-sharing transformer is n:m; When the electric current that flows through first winding of current-sharing transformer end of the same name is not equal to m:n with the ratio that flows through the electric current of second winding non-same polarity of current-sharing transformer; 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 autobalance two paths of LED load, and making the ratio balance of two winding currents of current-sharing transformer is m:n, thereby realizes the equilibrium control to the two paths of LED load current; When m=n, realize the sharing control of adjacent two paths of LED load current.
2. the multipath LED constant current drive circuit that is applicable to non-isolated converter as claimed in claim 1 is characterized in that multichannel loading all adopts the current-sharing between the two-way electric current.
3. the multipath LED constant current drive circuit that is applicable to non-isolated converter as claimed in claim 1 is characterized in that multichannel loading also comprises the current-sharing of one road electric current to two-way or multichannel electric current summation.
4. the multipath LED constant current drive circuit that is applicable to non-isolated converter as claimed in claim 1 is characterized in that described current-sharing transformer is one or more.
5. like any one described multipath LED constant current drive circuit that is applicable to non-isolated converter of claim 1-4; It is characterized in that the DC/AC translation circuit is half-bridge or full-bridge circuit; LLC resonance, LCC resonance or LC resonant circuit, the perhaps any circuit structure in the soft switch circuit.
6. like any one described multipath LED constant current drive circuit that is applicable to non-isolated converter of claim 1-4, it is characterized in that described current rectifying and wave filtering circuit is a bridge rectifier, any structure in voltage doubling rectifing circuit or the current-doubling rectifier.
7. like any one described multipath LED constant current drive circuit that is applicable to non-isolated converter of claim 1-4; It is characterized in that the main circuit that described DC/AC translation circuit and current rectifying and wave filtering circuit constitute is BUCK; BOOST; BUCK-BOOST, any DC/DC converter among CUK or the SEPIC.
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| CN2009102590869A CN101707838B (en) | 2009-12-04 | 2009-12-04 | Multipath LED constant current drive circuit suitable for non-isolated converter |
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| CN2009102590869A CN101707838B (en) | 2009-12-04 | 2009-12-04 | Multipath LED constant current drive circuit suitable for non-isolated converter |
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| CN105071669A (en) * | 2015-07-17 | 2015-11-18 | 苏州华电电气股份有限公司 | Parallel DC high voltage generator |
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| CN110012574B (en) * | 2019-04-19 | 2021-06-01 | 福州大学 | LED drive circuit of hybrid control single-stage bridgeless Sepic and LLC |
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| CN111556616B (en) * | 2020-06-02 | 2021-06-22 | 福州大学 | Single-stage bridgeless boosting Cuk resonant LED drive circuit |
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