CN102595725B - Multi-path light emitting diode (LED) driving circuit capable of accurately equalizing flow - Google Patents

Multi-path light emitting diode (LED) driving circuit capable of accurately equalizing flow Download PDF

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Publication number
CN102595725B
CN102595725B CN201210031036.7A CN201210031036A CN102595725B CN 102595725 B CN102595725 B CN 102595725B CN 201210031036 A CN201210031036 A CN 201210031036A CN 102595725 B CN102595725 B CN 102595725B
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connected
diode
capacitor
secondary winding
anode
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CN201210031036.7A
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CN102595725A (en
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吴新科
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浙江大学
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Abstract

The invention relates to an electric energy transducer, aims to provide a multi-path light emitting diode (LED) driving circuit capable of accurately equalizing flow. The circuit comprises a high-frequency alternating current source, a transformer T1 comprising n secondary windings, wherein the alternating current source is connected in parallel to two ends of a primary winding of the transformer T1; one end of every adjacent secondary winding is a capacitor connection end and connected to one end of the corresponding capacitor Cbn; the other end of each capacitor Cbn is connected in series with the capacitor on the side of the next-stage secondary winding through a diode; the capacitor Cbn is connected to the cathode of the diode; the capacitor of the next-stage secondary winding is connected to the anode of the diode; and the non-capacitance-connection end of each secondary winding is connected to an output rectifier circuit. According to the principal of charge exchange among a plurality of capacitors and the principal of ampere-second balance of the capacitors, the flow can be accurately equalized among multi-path output; and multi-path output can be performed only by adding a plurality of windings and a few rectifier elements to the output side of a main transformer. The circuit is simple, easily expanded and low in cost.

Description

A kind of multipath LED drive circuit of realizing precise current-equalizing

Technical field

The present invention relates to a kind of electric energy transducer of multichannel output, specifically a kind of multipath LED drive circuit of realizing precise current-equalizing.

Background technology

The application scenario of much electricity conversion needs current transformer can realize direct current constant current output, as battery charger, LED driving power etc.Except the output of needs multichannel, also need to realize high pressure isolation, to meet the requirement of safety and the requirement of high-strength electric insulation.

In order to obtain the multi-channel output direct stream current source of realizing isolation, generally all adopt the scheme of two-stage DC-DC, prime adopts the DC-DC of isolation to obtain constant voltage source, then follows a plurality of DC-DC that do not isolate and realizes independently constant current output of multichannel.This scheme is flexible and changeable, and reliability is higher.But, due to a plurality of independently rear class of needs DC-DC, therefore need independently control chip and switching device, greatly increased cost.

In order to reduce costs, there are a lot of employing passive modes to carry out multiple constant current, and can realize current-sharing more accurately between multichannel electric current.In Fig. 1, the mode of series coupled inductance in the rectifier diode in the high-frequency ac source of utilization isolation, realizes the current-sharing of the electric current of two-way direct current output.And, utilize the mutual coupling of a plurality of coupling inductances, can expand to the direct current output that multichannel is constant.But due to the diode coupling inductance of having connected, and the coupling inductor winding of multichannel is a lot, and the interface of these windings all must be connected in secondary rectifier diode, causes the PCB layout of secondary very complicated, has increased the high-frequency ac loss of a lot of PCB.

In Fig. 2, utilize the charge balance concept of electric capacity, in AC power, between rectification circuit, seal in capacitance C b, realize the balance of the electric charge of positive and negative two polarity, thereby obtain equating of DC side electric current.Although electric capacity cost is low, it is simple to realize,, the method need to coordinate the technology of auxiliary coupling inductance to realize while being used for more multichannel output, as Fig. 3.

Also having a kind of technology (Fig. 4) is by the former limit of a plurality of high frequency transformers windings in series, and secondary utilizes electric capacity rectification to obtain direct current, and it is identical to realize multichannel loading electric current.This technology utilizes the former secondary current of ideal transformer to depend on the principle of the turn ratio, is guaranteeing under the condition that a plurality of transformer turn ratioes are identical, and the average current of realizing secondary equates.Although this technology is simple, exists some to have a strong impact on the shortcoming of its range of application.Mainly comprise 1) because each transformer has been born the requirement of high insulation, so each transformer must safety requirement, cost increases greatly, has also reduced window utilance, affects the efficiency of current transformer.2) because the former limit of series connection exciting current is not reflected to secondary loop, therefore, when the larger topological structure of exciting current, as series and parallel resonant converter etc., the exciting current of its transformer and the ratio of load current are more approaching, the discreteness of considering magnetizing inductance is larger, so the equal mobility of multichannel output current is affected.

Summary of the invention

The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, and a kind of multipath LED drive circuit of realizing precise current-equalizing is provided.

For addressing the above problem, solution of the present invention is:

A kind of multipath LED drive circuit of realizing precise current-equalizing is provided, comprises a high-frequency ac source and a transformer T1, alternating current source is connected in parallel on the winding Np two ends, former limit of transformer T1; Described transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding, for connecing capacitance terminal, is connected to respectively one end of capacitor C bn separately, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with Same Name of Ends and non-same polarity; Between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, with diode, be connected in series, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage is connected to the anode of this diode;

For being arranged at first order secondary winding, meet the distolateral capacitor C b1 of electric capacity, one end that itself and diode join is also connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to output ground;

For being arranged at afterbody secondary winding, meet the distolateral capacitor C bn of electric capacity, one end that itself and diode join is also connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 connects output ground;

The non-capacitance terminal that connects of each secondary winding is connected to respectively an output rectification circuit, this output rectification circuit has identical circuit structure: two diode Dn2 and Dn3 series connection, the non-capacitance terminal that connects of its mid point and secondary winding is joined, the negative electrode of diode Dn2 is received the anode of output filter capacitor Con2, and the anode of diode Dn3 is received the negative terminal of output filter capacitor Con2; A load LED is connected in parallel on the two ends of output filter capacitor Con2, and the negative terminal of Con2 is connected to output ground simultaneously.

Provide another kind to realize the multipath LED drive circuit of precise current-equalizing, comprise a high-frequency ac source and several transformers T1, T2 ..., Tn, the former limit winding of each transformer be respectively Np1, Np2 ..., Npn, the secondary winding of each transformer be respectively Ns1, Ns2 ..., Nsn, high-frequency ac source is connected in parallel on the two ends of each transformer primary side winding; One end of each adjacent secondary winding, for connecing capacitance terminal, is connected to respectively one end of capacitor C bn separately, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with Same Name of Ends and non-same polarity; Between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, with diode, be connected in series, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage is connected to the anode of this diode;

For being arranged at first order secondary winding, meet the distolateral capacitor C b1 of electric capacity, one end that itself and diode join is also connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to output ground;

For being arranged at afterbody secondary winding, meet the distolateral capacitor C bn of electric capacity, one end that itself and diode join is also connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 connects output ground;

The non-capacitance terminal that connects of each secondary winding is connected to respectively an output rectification circuit, this output rectification circuit has identical circuit structure: two diode Dn2 and Dn3 series connection, the non-capacitance terminal that connects of its mid point and secondary winding is joined, the negative electrode of diode Dn2 is received the anode of output filter capacitor Con2, and the anode of diode Dn3 is received the negative terminal of output filter capacitor Con2; A load LED is connected in parallel on the two ends of output filter capacitor Con2, and the negative terminal of Con2 is connected to output ground simultaneously.

In the present invention, the described AC power being connected in parallel on the winding of former limit is the switch inversion topology of any both-end excitation.

In the present invention, as the distortion of scheme, be by capacitor C bn and with it series connection transformer secondary winding transposition.With the capacitor C bn of secondary windings in series can with Transformer Winding transposition, do not affect the performance of circuit, thus without the connected mode that changes other element in circuit.

In the present invention, even if any road or Multi-path LED load short circuit still can realize the precise current-equalizing of the electric current of all the other each road loads.

The electric charge of the present invention by between a plurality of electric capacity exchange and each electric capacity ampere-second balance principle, realize the accurate constant current between multichannel output.Only need increase at the outlet side of main transformer a plurality of windings, add a small amount of rectifier cell, just can realize multichannel output, circuit is simple, easily expansion, and cost is low.

Compare with the scheme that realizes secondary current-sharing, beneficial effect of the present invention is:

1, without the extra magnetic cell for current-sharing, only need electric capacity, cost is low, and efficiency is high.

2, adopt electric capacity to reduce volume, density is high.

3, transformer can expand to multichannel, and realizes multi-path flow equalizing.

4, former limit can be the switch circuit topology of realizing arbitrarily transformer both-end excitation, and circuits built is very flexible.

5, also can adopt the transformer of modularized design, realize the modularization of multichannel output.

6, current-sharing reliability is high, even if a road or Multi-path LED load short circuit remain each road load and also can realize accurate constant current.

Accompanying drawing explanation

Fig. 1 is the flow equalize technology of diode series coupled inductance;

Fig. 2 is the two-way flow equalizing circuit of secondary series connection capacitance;

Fig. 3 is for adopting auxiliary coupling inductance Si road current-sharing output rectification circuit;

Fig. 4 is the technology that realizes secondary current-sharing of transformer primary side series connection;

Fig. 5 is the rectification circuit of the n road constant current output that proposes of the present invention;

Fig. 6 is the rectification circuit of the modified model n road constant current output that proposes of the present invention;

Fig. 7 is that former limit is the embodiment of the Tu5Zhong tri-road output schemes of half-bridge circuit;

Fig. 8 is that former limit is the embodiment of the Tu6Zhong tri-road output schemes of half-bridge circuit.

Specific embodiment

Below in conjunction with accompanying drawing, embodiment of the present invention are specifically addressed.

Technical scheme in Fig. 5 has solved the equal flow problem of n paths of LEDs output.This scheme comprises a high-frequency ac source, transformer T1, former limit winding Np, n secondary winding Ns1, Ns2, Nsn.Alternating current source is connected in parallel on the two ends of Np, the Same Name of Ends output of Ns1 connects one end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D13, the negative electrode of diode D12 is received the anode of output filter capacitor Co12, and the anode of diode D13 is received the negative terminal of Co12.Load LED1 is connected in parallel on the two ends of Co12, and the negative terminal of Co12 is as output ground.The other end of Cb1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 is received output ground.The non-same polarity of Ns2 connects one end of capacitor C b2, the negative electrode of the anode of terminating diode D22 of the same name and diode D23, and the negative electrode of diode D22 is connected to the anode of filter capacitor Co22, and the negative terminal of Co22 is received output ground, and LED2 is connected in parallel on the two ends of Co22.The negative electrode of diode Dn1 in the anode of another termination D21 of Cb2 and next stage circuit.

With this connected mode, analogize the connection that export on n n road corresponding to winding, one end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that Same Name of Ends and non-same polarity alternately occur simultaneously; The anode of diode Dn1 in afterbody circuit connects the negative electrode of diode Dn4 in afterbody circuit, and the anode of Dn4 connects output ground.

Technical scheme in Fig. 6, as a kind of improvement of Fig. 5, has solved the equal flow problem of n paths of LEDs output.This scheme comprises a high-frequency ac source, transformer T1, T2 ... Tn, the former limit winding Np1 of T1, the former limit winding Np2 of T2, the former limit winding Npn of Tn, the secondary winding Ns1 of T1, the secondary winding Ns2 of T2, the secondary winding Nsn of Tn.Input AC source is connected in parallel on all transformer primary side winding (Np1, Np2 ... Npn) two ends.The Same Name of Ends output of Ns1 connects one end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D13, and the negative electrode of diode D12 is received the anode of output filter capacitor Co12, and the anode of diode D13 is received the negative terminal of Co12.Load LED1 is connected in parallel on the two ends of Co12, and the negative terminal of Co12 is as output ground.The other end of Cb1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 connects output ground.The non-same polarity of Ns2 connects one end of capacitor C b2, the negative electrode of the anode of terminating diode D22 of the same name and diode D23, and the negative electrode of diode D22 is connected to the anode of filter capacitor Co22, and the negative terminal of Co22 is received output ground, and LED2 is connected in parallel on the two ends of Co22.The negative electrode of diode Dn1 in the anode of another termination D21 of Cb2 and next stage circuit.

With this connected mode, analogize the connection that export on n n road corresponding to winding, one end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that Same Name of Ends and non-same polarity alternately occur simultaneously; The anode of diode Dn1 in afterbody circuit connects the negative electrode of diode Dn4 in afterbody circuit, and the anode of Dn4 connects output ground.

As shown in Figure 7, switching tube S1 and S2 form a switch brachium pontis, and input direct-current Vin is connected across the two ends of switch brachium pontis.The mid point of S1 and S2 is connected to one end of inductance L r, and the other end of Lr saves one end of the former limit winding Np of transformer T1, and the other end of Np is received one end of capacitor C r, and the other end of capacitor C r is received the negative terminal of input Vin.Transformer T1 has three secondary winding Ns1, Ns2 and Ns3, the Same Name of Ends output of Ns1 connects one end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D13, the negative electrode of diode D12 is received the anode of output filter capacitor Co12, and the anode of diode D13 is received the negative terminal of Co12.Load LED2 is connected in parallel on the two ends of Co12, and the negative terminal of Co12 is as output ground.The other end of capacitor C b1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 connects output ground.

One end of a termination capacitor C b2 of Ns2, the negative electrode of the anode of terminating diode D22 of the same name and diode D23, the negative electrode of diode D22 is connected to the anode of filter capacitor Co22, and the negative terminal of Co22 is received output ground, and LED2 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D31.The negative electrode of D21 is received the anode of D11.

One end of a termination capacitor C b3 of Ns3, the negative electrode of the anode of terminating diode D32 of the same name and diode D33, the negative electrode of diode D32 is connected to the anode of filter capacitor Co32, and the negative terminal of Co32 is received output ground, and LED3 is connected in parallel on the two ends of Co32.The anode of another termination D31 of Cb3 and the negative electrode of diode D34, the anode of D34 is received output ground.The negative electrode of D31 is received the anode of D21.

As shown in Figure 8, three independently former limit winding Np1, Np2 and the Np3 of transformer T1, T2 and T3 are connected in parallel on two ends, input AC source separately, be convenient to modularization and the standardized designs of transformer, by the increase and decrease of shunt transformer quantity and corresponding auxiliary element, meet flexibly the change of output way, without revising main transformer parameter.

This scheme comprises a high-frequency ac source, transformer T1, T2 and T3, the former limit winding Np1 of T1, the former limit winding Np2 of T2, the former limit winding Np3 of T3, the secondary winding Ns2 of the secondary winding Ns1 of T1 and T2, the secondary winding Ns3 of T3; Input AC source is connected in parallel on Np1, the two ends of Np2 and Np3, the Same Name of Ends output of Ns1 connects one end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D13, the negative electrode of diode D12 is received the anode of output filter capacitor Co12, and the anode of diode D13 is received the negative terminal of Co12.Load LED1 is connected in parallel on the two ends of Co12, and the negative terminal of Co12 is as output ground.The other end of the other end of Cb1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 connects output ground.

One end of a termination capacitor C b2 of Ns2, the negative electrode of the anode of terminating diode D22 of the same name and diode D23, the negative electrode of diode D22 is connected to the anode of filter capacitor Co22, and the negative terminal of Co22 is received output ground, and LED2 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2.

One end of a termination capacitor C b3 of Ns3, the negative electrode of the anode of terminating diode D32 of the same name and diode D33, the negative electrode of diode D32 is connected to the anode of filter capacitor Co32, and the negative terminal of Co32 is received output ground, and LED3 is connected in parallel on the two ends of Co32.The anode of another termination D31 of Cb3 and the negative electrode of diode D34.The negative electrode of D31 is received the anode of D21, and the anode of diode D34 is received output ground.

It should be noted that the specific term using should not redefine this term here with restriction of the present invention some certain features, feature or the scheme relevant to this term for being illustrated in when explanation some feature of the present invention or scheme.In a word, should be not disclosed specific embodiment in limiting the invention to specification by the terminological interpretation of using in the claims of enclosing, unless above-mentioned detailed description part defines these terms clearly.Therefore, actual range of the present invention not only comprises the disclosed embodiments, is also included under claims and implements or to carry out all equivalents of the present invention.

Claims (4)

1. realize a multipath LED drive circuit for precise current-equalizing, comprise a high-frequency ac source and a transformer T1, alternating current source is connected in parallel on the winding Np two ends, former limit of transformer T1; It is characterized in that, described transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding, for connecing capacitance terminal, is connected to respectively one end of an electric capacity, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with Same Name of Ends and non-same polarity; And the other end that meets the distolateral capacitor C b1 of electric capacity at first order secondary winding Ns1 connects between the distolateral capacitor C b2 of electric capacity with second level secondary winding Ns2 and is connected in series with diode D21, capacitor C b1 is connected to the negative electrode of diode D21, and capacitor C b2 is connected to the anode of diode D21; Annexation between adjacent secondary windings at different levels by that analogy;
For being arranged at first order secondary winding, meet the distolateral capacitor C b1 of electric capacity, one end that itself and diode join is also connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to output ground;
For being arranged at afterbody secondary winding, meet the distolateral capacitor C bn of electric capacity, one end that itself and diode join is also connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to respectively an output rectification circuit, this output rectification circuit has identical circuit structure: two diode Dn2 and Dn3 series connection, the non-capacitance terminal that connects of its mid point and secondary winding is joined, the negative electrode of diode Dn2 is received the anode of output filter capacitor Con2, and the anode of diode Dn3 is received the negative terminal of output filter capacitor Con2; A load LED is connected in parallel on the two ends of output filter capacitor Con2, and the negative terminal of Con2 is connected to output ground simultaneously.
2. a multipath LED drive circuit of realizing precise current-equalizing, comprise a high-frequency ac source and several transformers T1, T2 ..., Tn, the former limit winding of each transformer be respectively Np1, Np2 ..., Npn, the secondary winding of each transformer be respectively Ns1, Ns2 ..., Nsn, it is characterized in that, high-frequency ac source is connected in parallel on the two ends of each transformer primary side winding; One end of each adjacent secondary winding, for connecing capacitance terminal, is connected to respectively one end of an electric capacity, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with Same Name of Ends and non-same polarity; And the other end that meets the distolateral capacitor C b1 of electric capacity at first order secondary winding Ns1 connects between the distolateral capacitor C b2 of electric capacity with second level secondary winding Ns2 and is connected in series with diode D21, capacitor C b1 is connected to the negative electrode of diode D21, and capacitor C b2 is connected to the anode of diode D21; Annexation between adjacent secondary windings at different levels by that analogy;
For being arranged at first order secondary winding, meet the distolateral capacitor C b1 of electric capacity, one end that itself and diode join is also connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to output ground;
For being arranged at afterbody secondary winding, meet the distolateral capacitor C bn of electric capacity, one end that itself and diode join is also connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to respectively an output rectification circuit, this output rectification circuit has identical circuit structure: two diode Dn2 and Dn3 series connection, the non-capacitance terminal that connects of its mid point and secondary winding is joined, the negative electrode of diode Dn2 is received the anode of output filter capacitor Con2, and the anode of diode Dn3 is received the negative terminal of output filter capacitor Con2; A load LED is connected in parallel on the two ends of output filter capacitor Con2, and the negative terminal of Con2 is connected to output ground simultaneously.
3. according to the LED drive circuit described in claim 1 or 2, it is characterized in that, the described AC power being connected in parallel on the winding of former limit is the switch inversion topology of any both-end excitation.
4. according to the LED drive circuit described in claim 1 or 2, it is characterized in that, as the distortion of scheme, be by capacitor C bn and with it series connection transformer secondary winding transposition.
CN201210031036.7A 2012-02-13 2012-02-13 Multi-path light emitting diode (LED) driving circuit capable of accurately equalizing flow CN102595725B (en)

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CN106973457B (en) * 2017-01-05 2018-07-17 福州大学 A kind of isolated form high-power LED driving power source that multiple-channel output flows and its implementation
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CN109392210A (en) * 2017-08-02 2019-02-26 深圳市暗能量电源有限公司 The LED illumination driving circuit of no several levels electric current output

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