CN102548151A - LED (light emitting diode) driver for multi-path constant current output - Google Patents
LED (light emitting diode) driver for multi-path constant current output Download PDFInfo
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Abstract
The invention relates to a multi-path output electric energy transducer and aims to provide an LED (light emitting diode) driver for multi-path constant current output. The driver comprises a high-frequency alternating current source and a transformer T1 with n secondary windings, wherein one terminals of every two adjacent secondary windings are capacitor connecting terminals which are respectively connected to one terminals of respective capacitors Cbn, and the capacitor connecting terminals of every two adjacent secondary windings appear alternately in forms of dotted terminals and non-dotted terminals; the other terminal of each capacitor Cbn is connected with a capacitor of a next level of secondary winding in series by an LED, the capacitor Cbn is connected to the cathode of the LED and the next level of capacitor is connected to the anode of the LED; the non capacitor connecting terminal of each secondary winding is respectively connected to an output rectifying circuit. The LED driver can realize accurate constant current among multiple paths of output on the basis of charge interchange among multiple capacitors and ampere-second balance principle of each capacitor. Multi-path output can be realized just through adding multiple winds at the output side of a main transformer and arranging few rectifier elements. The LED driver is simple in circuit, easy to expand and low in cost.
Description
Technical field
The present invention relates to a kind of electric energy transducer of multichannel output, a kind of specifically led driver of realizing the output of multichannel constant current.
Background technology
The application scenario of much electricity conversion needs current transformer can realize direct current constant current output, like battery charger, LED driving power etc.Except needs multichannel output, need realize that also high pressure isolates, with the requirement of satisfying safety and the requirement of high strength electric insulation.
In order to obtain to realize that the multi-channel output direct of isolating flows current source, generally all adopt the scheme of two-stage DC-DC, prime adopts the DC-DC that isolates to obtain constant voltage source, follows a plurality of independently constant current outputs of not isolating of DC-DC realization multichannel then.This scheme is flexible and changeable, and reliability is higher.But, owing to need a plurality of independently back level DC-DC, therefore need independently control chip and switching device, increased cost greatly.
In order to reduce cost, there are a lot of employing passive modes to carry out multiple constant current, and can realize current-sharing more accurately between the multichannel electric current.The mode of series coupled inductance in the rectifier diode in the high-frequency ac source that utilization is isolated among Fig. 1 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 constant direct current output of multichannel.But the coupling inductance because diode has been connected, and the coupling inductance winding of multichannel is a lot, and the interface of these windings all must be connected in the secondary rectifier diode, causes the PCB layout of secondary very complicated, has increased the high-frequency ac loss of a lot of PCB.
Utilize the charge balance concept of electric capacity among Fig. 2, between rectification circuit, seal in capacitance CB, realize the balance of the electric charge of positive and negative two polarity, thereby obtain equating of DC side electric current in AC power.Though the electric capacity cost is low, it is simple to realize,, this method need cooperate the technology of auxiliary coupling inductance to realize when being used for more multichannel output, like Fig. 3.
Also having a kind of technology (Fig. 4) is with the former limit of a plurality of high frequency transformers windings in series, and secondary utilizes the electric capacity rectification to obtain direct current, and realizes that the multichannel loading electric current is identical.The former secondary current of this techniques make use ideal transformer depends on the principle of the turn ratio, is guaranteeing under the identical condition of a plurality of transformer turn ratioes, realizes that the average current of secondary equates.Though 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 all been born the requirement of high insulation, so each transformer all must the safety requirement, cost increases greatly, has also reduced the window utilance, influences the efficient of current transformer.2) because the former limit of series connection exciting current is not reflected to the secondary loop; Therefore; When the bigger topological structure of exciting current, like 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 bigger, so the equal mobility of multichannel output current is affected.
Summary of the invention
The technical problem that the present invention will solve is, overcomes the deficiency of prior art, provide a kind of can simpler multiple constant current output led driver.
For addressing the above problem, solution of the present invention is:
A kind of led driver of realizing the output of multichannel constant current 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; Said transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding is connected to the end of capacitor C bn separately respectively for connecing capacitance terminal, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with end of the same name and non-same polarity; Be connected in series with diode between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage then is connected to the anode of this diode;
Meet the distolateral capacitor C b1 of electric capacity for being arranged at first order secondary winding, the end that itself and diode join also is connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to the anode of filter capacitor Co11; The negative terminal of filter capacitor Co11 is received output ground, and a load LED is connected in parallel on its two ends;
Meet the distolateral capacitor C bn of electric capacity for being arranged at afterbody secondary winding, the end that itself and diode join also is connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 then connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to an output rectification circuit respectively; 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.
Second kind of led driver of realizing the output of multichannel constant current provided by the invention; 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, the high-frequency ac source is connected in parallel on the two ends of the former limit of each transformer winding; One end of each adjacent secondary winding is connected to the end of capacitor C bn separately respectively for connecing capacitance terminal, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with end of the same name and non-same polarity; Be connected in series with diode between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage then is connected to the anode of this diode;
Meet the distolateral capacitor C b1 of electric capacity for being arranged at first order secondary winding, the end that itself and diode join also is connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to the anode of filter capacitor Co11; The negative terminal of filter capacitor Co11 is received output ground, and a load LED is connected in parallel on its two ends;
Meet the distolateral capacitor C bn of electric capacity for being arranged at afterbody secondary winding, the end that itself and diode join also is connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 then connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to an output rectification circuit respectively; 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.
Provided by the invention the third realized the led driver of multichannel constant current output, comprises a high-frequency ac source and a transformer T1, and alternating current source is connected in parallel on the winding Np two ends, former limit of transformer T1; Said transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding is connected to one first output rectification circuit respectively for connecing capacitance terminal;
Said first output rectification circuit has the end of identical circuit structure: capacitor C bn and the capacitance terminal that connects of secondary winding is joined, the anode of another terminating diode Dn1; The negative electrode of diode Dn1 is connected to the anode of output filter capacitor Con1, and the negative terminal of filter capacitor Con1 is received the anode of the diode D (n-1) 1 in first output rectification circuit of upper level; A load LED is connected in parallel on the two ends of Con1;
The non-capacitance terminal that connects of each secondary winding is connected to one second output rectification circuit respectively; Said second 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;
For the filter capacitor Co11 in first output rectification circuit of the first order, its negative terminal is received output ground; For the diode Dn1 in first output rectification circuit of afterbody, its anode also is connected to the negative electrode of a diode, and the anode of this diode then connects output ground.
Among the present invention, the switch inversion topology that the described AC power that is connected in parallel on the winding of former limit is any both-end excitation.
Among the present invention, as the distortion of scheme, be with capacitor C bn and with it the series connection transformer secondary winding transposition.With the capacitor C bn of secondary windings in series can with the Transformer Winding transposition, do not influence the performance of circuit, thereby need not to change the connected mode of other element in the circuit.
Among the present invention, the load in said first output rectification circuit is LED (2n-1); To the distortion of described scheme before this, is with this load and diode Dn1 transposition as a kind of.
The present invention realizes the accurate constant current between the multichannel output through the ampere-second principle for balance of the exchange of the electric charge between a plurality of electric capacity and each electric capacity.Only needing increases a plurality of windings at the outlet side of main transformer, adds a small amount of rectifier cell, just can realize multichannel output, and circuit is simple, easy expansion, and cost is low.
Compare with the scheme that realizes the secondary current-sharing, beneficial effect of the present invention is:
1, need not the extra magnetic cell that is used for current-sharing, only need electric capacity, cost is low, and efficient is high.
2, adopt electric capacity to reduce volume, density is high.
3, transformer can expand to multichannel, and realizes the multichannel current-sharing.
4, former limit can be a switch circuit topology of realizing transformer both-end excitation arbitrarily, and circuits built is very flexible.
5, also can adopt the transformer of modularized design, realize the modularization of multichannel output.
Description of drawings
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 four tunnel current-sharing output rectification circuits of auxiliary coupling inductance;
Fig. 4 is the technology of the realization secondary current-sharing of transformer former limit series connection;
The rectification circuit that Fig. 5 exports for three tunnel constant currents that the present invention proposes;
The rectification circuit that Fig. 6 exports for modified model three tunnel constant currents that the present invention proposes;
The rectification circuit that Fig. 7 exports for four tunnel constant currents that the present invention proposes;
The rectification circuit that Fig. 8 exports for the n+1 road constant current that the present invention proposes;
The rectification circuit that Fig. 9 exports for the modified model n+1 road constant current that the present invention proposes;
The rectification circuit that Figure 10 exports for the 2n road constant current that the present invention proposes;
Figure 11 is the embodiment of three road output schemes among Fig. 6 of half-bridge circuit for former limit;
Figure 12 is the embodiment of four road output schemes among Fig. 7 of half-bridge circuit for former limit.
Specific embodiment
Below in conjunction with accompanying drawing embodiment of the present invention are specifically set forth.
Technical scheme among Fig. 5 has solved the equal flow problem of three paths of LEDs outputs (LED1, LED2 and LED3).Comprise a high-frequency ac source in this scheme, transformer T1, former limit winding Np; Two secondary winding Ns1 and Ns2; Alternating current source is connected in parallel on the two ends of Np, and the end output of the same name of Ns1 connects the end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D12; 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 Cb1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 is received the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.
The end of the termination capacitor Cb2 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 LED3 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D24, the anode of D24 are received output ground.The negative electrode of D21 is received the anode of D11.
Technical scheme among Fig. 6 is as a kind of improvement of Fig. 5; Two independently former limit winding Np1 and the Np2 of transformer T1 and T2 are connected in parallel on two ends, input AC source separately; Be convenient to the modularization and the standardized designs of transformer; Increase and decrease through shunt transformer quantity and corresponding auxiliary element satisfies flexibly the change of exporting way, need not to revise the main transformer parameter.
Comprise a high-frequency ac source in this scheme, transformer T1 and T2, the former limit winding Np1 of T1; The former limit winding Np2 of T2, the secondary winding Ns2 of the secondary winding Ns1 of T1 and T2, the input AC source is connected in parallel on the two ends of Np1 and Np2; The end output of the same name of Ns1 connects the end of capacitor C b1; The anode of another terminating diode D12 and the negative electrode of D12, 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 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 the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.
The end of the termination capacitor Cb2 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 LED3 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D24, the anode of D24 are received output ground.The negative electrode of D21 is received the anode of D11.
Technical scheme among Fig. 7 is improved as the another kind of Fig. 5, has solved the equal flow problem of four paths of LEDs outputs (LED1, LED2, LED3 and LED4).Comprise a high-frequency ac source in this scheme, transformer T1, former limit winding Np; Two secondary winding Ns1 and Ns2; Alternating current source is connected in parallel on the two ends of Np, and the end output of the same name of Ns1 connects the end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D12; 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 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 the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.
The end of the termination capacitor Cb2 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 LED3 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D24, the anode of D24 are received output ground.The negative electrode of D21 is received the anode of output filter capacitor Co21, and the negative terminal of Co21 is received the anode of diode D11.Simultaneously, LED3 is connected in parallel on the two ends of Co21.
Technical scheme among Fig. 8 is improved as the another kind of Fig. 5, has solved the equal flow problem of n+1 paths of LEDs output.Comprise a high-frequency ac source in this scheme, 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 end output of the same name of Ns1 connects the end of capacitor C b1; The anode of another terminating diode D12 and the negative electrode of D12, 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 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 the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.The non-same polarity of Ns2 connects the 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 LED3 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 the next stage circuit.
Analogize the connection that export on the corresponding n+1 road of n winding with this connected mode, the end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that end of the same name and non-same polarity alternately occur simultaneously; The anode of diode Dn1 in the afterbody circuit connects the negative electrode of diode Dn4 in the afterbody circuit, and the anode of Dn4 connects output ground.
Technical scheme among Fig. 9 has solved the equal flow problem of n+1 paths of LEDs output as a kind of improvement of Fig. 6.Comprise a high-frequency ac source in this scheme, 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.The input AC source is connected in parallel on the former limit of all transformers winding (Np1, Np2 ... Npn) two ends.The end output of the same name of Ns1 connects the end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D12, 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 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 Cb1 is received the anode of diode D11, receives the negative electrode of diode D21 simultaneously; The negative electrode of diode D11 is received the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.The non-same polarity of Ns2 connects the 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 LED3 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 the next stage circuit.
Analogize the connection that export on the corresponding n+1 road of n winding with this connected mode, the end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that end of the same name and non-same polarity alternately occur simultaneously; The anode of diode Dn1 in the afterbody circuit connects the negative electrode of diode Dn4 in the afterbody circuit, and the anode of Dn4 connects output ground.
Analogize the connection that export on the corresponding n+1 road of n winding with this connected mode, the end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that end of the same name and non-same polarity alternately occur simultaneously.
Technical scheme among Figure 10 has solved the equal flow problem of 2n paths of LEDs output as a kind of improvement of Fig. 7.Comprise a high-frequency ac source in this scheme, 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, and the end output of the same name of Ns1 connects the end of capacitor C b1, the anode of another terminating diode D12 and the negative electrode of D12; 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 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 the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.The end of the termination capacitor Cb2 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 LED3 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2, different with aforementioned schemes is, LED load LED3 of series connection among the diode D21, and at the LED3 two ends parallel connection filter capacitor Co21.The negative electrode of D21 is received the anode of Co21, and the negative terminal of Co21 is received the anode of D11.The anode of diode D21 receive Con1 in the next stage circuit negative terminal, LED (2n-1) load is connected in parallel on the two ends of Con1, the negative electrode that just terminates to diode Dn1 of Con1.Analogize being connected of corresponding 2n of n winding and the output of 2n-1 road with this connected mode, the end that meets capacitor C bn and Cbn-1 of winding N and winding N-1 is that end of the same name and non-same polarity alternately occur simultaneously.The anode of diode Dn1 in the afterbody circuit connects the negative electrode of diode Dn4 in the afterbody circuit, and the anode of Dn4 connects output ground.Different with aforementioned two kinds of schemes is, the LED load of respectively connecting to the Dn1 of the diode D21 from the second level to the n level, and in the LED load parallelly connected filter capacitor, thereby expansion obtains the output of 2n paths of LEDs.
In the such scheme, the LED that connects among the diode Dn1 (2n-1) load and diode can transpositions, do not influence circuit working state and characteristic;
Shown in figure 11, 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 the end of inductance L r, and the other end of Lr saves the end of the former limit winding Np of transformer T1, and the other end of Np is received the end of capacitor C r, and the other end of capacitor C r is received the negative terminal of input Vin.Transformer T1 has two secondary winding Ns1 and Ns2; The end output of the same name of Ns1 connects the 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 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 is received the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.
The end of the termination capacitor Cb2 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 LED3 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D24, the anode of D24 are received output ground.The negative electrode of D21 is received the anode of D11.
Shown in figure 12, 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 the end of inductance L r, and the other end of Lr saves the end of the former limit winding Np of transformer T1, and the other end of Np is received the end of capacitor C r, and the other end of capacitor C r is received the negative terminal of input Vin.Transformer T1 has two secondary winding Ns1 and Ns2; The end output of the same name of Ns1 connects the 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 Cb1 is received the anode of diode D11; The negative electrode of diode D11 is received the anode of filter capacitor Co11, and the negative terminal of Co11 is received output ground.Load LED1 is connected in parallel on the two ends of Co11.
The end of the termination capacitor Cb2 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 LED4 is connected in parallel on the two ends of Co22.The anode of another termination D21 of Cb2 and the negative electrode of diode D24, the anode of D24 are received output ground.The negative electrode of D21 is received the anode of output filter capacitor Co21, and the negative terminal of Co21 is received the anode of diode D11.Simultaneously, LED3 is connected in parallel on the two ends of Co21.
Should be noted that employed specific term should not be used to be illustrated in when explanation some characteristic of the present invention or scheme defines this term here again with restriction of the present invention some certain features, characteristic or the scheme relevant with this term.In a word, should be with the terminological interpretation of in the claims of enclosing, using for the present invention not being limited to disclosed specific embodiment in the specification, only if above-mentioned detailed description part defines these terms clearly.Therefore, actual range of the present invention not only comprises the disclosed embodiments, also is included in to implement or carry out all equivalents of the present invention under claims.
Claims (6)
1. a led driver of realizing the output of multichannel constant current comprises a high-frequency ac source and a transformer T1, and alternating current source is connected in parallel on the winding Np two ends, former limit of transformer T1; It is characterized in that said transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding is connected to the end of capacitor C bn separately respectively for connecing capacitance terminal, and the capacitance terminal that connects of adjacent secondary winding alternately occurs with end of the same name and non-same polarity; Be connected in series with diode between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage then is connected to the anode of this diode;
Meet the distolateral capacitor C b1 of electric capacity for being arranged at first order secondary winding, the end that itself and diode join also is connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to the anode of filter capacitor Co11; The negative terminal of filter capacitor Co11 is received output ground, and a load LED is connected in parallel on its two ends;
Meet the distolateral capacitor C bn of electric capacity for being arranged at afterbody secondary winding, the end that itself and diode join also is connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 then connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to an output rectification circuit respectively; 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. led driver of realizing multichannel constant current output; 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, the high-frequency ac source is connected in parallel on the two ends of the former limit of each transformer winding; It is characterized in that an end of each adjacent secondary winding is connected to the end of capacitor C bn separately respectively for connecing capacitance terminal, and the capacitance terminal that connects of adjacent secondary winding occurs alternately with end of the same name and non-same polarity; Be connected in series with diode between the electric capacity of the other end of each capacitor C bn and next stage secondary winding side, capacitor C bn is connected to the negative electrode of this diode, and the electric capacity of next stage then is connected to the anode of this diode;
Meet the distolateral capacitor C b1 of electric capacity for being arranged at first order secondary winding, the end that itself and diode join also is connected to the anode of another diode D11, and the negative electrode of diode D11 is connected to the anode of filter capacitor Co11; The negative terminal of filter capacitor Co11 is received output ground, and a load LED is connected in parallel on its two ends;
Meet the distolateral capacitor C bn of electric capacity for being arranged at afterbody secondary winding, the end that itself and diode join also is connected to the negative electrode of another diode Dn4, and the anode of diode Dn4 then connects output ground;
The non-capacitance terminal that connects of each secondary winding is connected to an output rectification circuit respectively; 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. a led driver of realizing the output of multichannel constant current comprises a high-frequency ac source and a transformer T1, and alternating current source is connected in parallel on the winding Np two ends, former limit of transformer T1; It is characterized in that said transformer T1 comprises n secondary winding, for Ns1, Ns2 ..., Nsn; One end of each adjacent secondary winding is connected to one first output rectification circuit respectively for connecing capacitance terminal;
Said first output rectification circuit has the end of identical circuit structure: capacitor C bn and the capacitance terminal that connects of secondary winding is joined, the anode of another terminating diode Dn1; The negative electrode of diode Dn1 is connected to the anode of output filter capacitor Con1, and the negative terminal of filter capacitor Con1 is received the anode of the diode D (n-1) 1 in first output rectification circuit of upper level; A load LED is connected in parallel on the two ends of Con1;
The non-capacitance terminal that connects of each secondary winding is connected to one second output rectification circuit respectively; Said second 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;
For the filter capacitor Co11 in first output rectification circuit of the first order, its negative terminal is received output ground; For the diode Dn1 in first output rectification circuit of afterbody, its anode also is connected to the negative electrode of a diode Dn4, and the anode of this diode then connects output ground.
4. according to the led driver described in any one of the claim 1 to 3, it is characterized in that the switch inversion topology that the described AC power that is connected in parallel on the winding of former limit is any both-end excitation.
5. according to the led driver described in any one of the claim 1 to 3, it is characterized in that, as the distortion of scheme, is with the capacitor C bn and the transformer secondary winding transposition of series connection with it.
6. according to the led driver described in the claim 3, it is characterized in that the load in said first output rectification circuit is LED (2n-1); To the distortion of described scheme before this, is with this load and diode Dn1 transposition as a kind of.
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| WO2019024417A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市暗能量电源有限公司 | Led illumination driving circuit of multi-stage current outputs |
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