CN109392210A - The LED illumination driving circuit of no several levels electric current output - Google Patents
The LED illumination driving circuit of no several levels electric current output Download PDFInfo
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- CN109392210A CN109392210A CN201710652301.6A CN201710652301A CN109392210A CN 109392210 A CN109392210 A CN 109392210A CN 201710652301 A CN201710652301 A CN 201710652301A CN 109392210 A CN109392210 A CN 109392210A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/39—Circuits containing inverter bridges
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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Abstract
The invention discloses a kind of LED illumination driving circuits of no several levels electric current output, including high-frequency ac source AC and transformer T1, high-frequency ac source AC to be connected in parallel on the both ends of the primary side winding Np of transformer T1；Transformer T1 includes several vice-side windings, and one end of each adjacent vice-side winding is connect with one end of respective capacitance Cbn, and one end of adjacent vice-side winding is alternately present with Same Name of Ends and non-same polarity；The other end of each capacitance Cbn is connect by diode D (n+1) 1 with the other end of the capacitance Cb (n+1) of the side next stage vice-side winding Ns (n+1), the other end of capacitance Cb1 is also connected with the anode of diode D11, the anode of the cathode connection output filter capacitor CO11 of diode D11.The present invention is able to achieve that accurate constant current, circuit between the output of no several levels are simple, be easy extension, cost is relatively low, can reduce volume.
Description
Technical field
The present invention relates to field of LED drive, in particular to a kind of LED illumination driving circuit of no several levels electric current output.
Background technique
The application of much electricity conversion needs current transformer to can be realized direct current constant current output, such as battery charger, LED
Driving power etc..Other than needing without several levels output, it is also necessary to high_voltage isolation is realized, to meet requirement and the high intensity electricity of safety
It draws last breath the requirement of edge.It realizes that is isolated exports DC current source without several levels to obtain, is generally used the side of two-stage DC-DC
Case, prime obtain constant voltage source using the DC-DC of isolation, realize followed by multiple DC-DC not being isolated only without several levels
Vertical constant current output.The program is flexible and changeable, and reliability is higher.But it due to needing multiple independent rear class DC-DC, needs
Independent control chip and switching device are wanted, cost is considerably increased.
In order to reduce cost, has and much carried out using passive mode without several levels constant current, and no several levels electric current may be implemented
Between more accurately flow.In Fig. 1 by isolation high-frequency ac source rectifier diode in series coupled inductance in the way of,
Realize the stream of the electric current of two-way direct current output.Also, using being mutually coupled for multiple coupling inductances, it can extend to multichannel perseverance
Fixed direct current output.But due to Diode series coupling inductance, and there are many coupling inductance winding of multichannel, these windings
Interface must all be connected in secondary side rectifier diode, cause the PCB layout on secondary side very complicated, increase the height of many PCB
Frequency A.C.power loss.
The charge balance concept that capacitor is utilized in Fig. 2, seals in capacitance C between AC power source and rectification circuitB, real
The balance of existing positive and negative two polar charges, to obtain the equal of DC side electric current.Although capacitor is at low cost, realization is simple,
But this method is used to need the technology for cooperating auxiliary coupling inductance to realize when more multiple-channel output, such as Fig. 3.
In addition there are also a kind of technology as shown in figure 4, Fig. 4 is by the primary side winding series connection of multiple high frequency transformers, secondary lateral dominance
Direct current is obtained with capacitance rectifier, and realizes that multichannel loading electric current is identical.The technology is taken using the former secondary current of ideal transformer
Certainly in the principle of the turn ratio, guaranteeing multiple transformer turns ratios under the same conditions, is realizing that the average current on secondary side is equal.The technology
Although simple, there are some the shortcomings that seriously affecting its application range.It specifically includes that 1) since each transformer is borne by
The requirement of high insulation, therefore each transformer has to meet safety requirement, cost greatly increases, and also reduces window benefit
With rate, the efficiency of current transformer is influenced.2) since series connection primary side exciting current does not reflect secondary loop, exciting current ratio
Biggish topological structure, such as series and parallel resonant converter, the exciting current of transformer and the ratio of load current relatively connect
Closely, it is contemplated that the discreteness of magnetizing inductance is larger, therefore the equal mobility without several levels output electric current is affected.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, provide one kind be able to achieve it is countless
Accurate constant current, circuit between grade output be simple, be easy extension, cost is relatively low, can reduce volume without the output of several levels electric current
LED illumination driving circuit.
The technical solution adopted by the present invention to solve the technical problems is: the LED for constructing a kind of no several levels electric current output shines
Bright driving circuit, including a high-frequency ac source AC and transformer a T1, the high-frequency ac source AC are connected in parallel on the transformation
The both ends of the primary side winding Np of device T1；The transformer T1 includes several vice-side windings, one end point of each adjacent vice-side winding
It is not connect with one end of respective capacitance Cbn, and one end of adjacent vice-side winding is alternately present with Same Name of Ends and non-same polarity；
The other end of each capacitance Cbn passes through the capacitance Cb (n of diode D (n+1) 1 and the side next stage vice-side winding Ns (n+1)
+ 1) other end connection, the n are the integer greater than 0；
The other end for being set to the capacitance Cb1 of the side vice-side winding Ns1 of the transformer T1 is also connected with diode D11
Anode, the anode of the cathode connection output filter capacitor CO11 of the diode D11, the output filter capacitor CO11's is negative
Pole connects output ground, and the both ends of the output filter capacitor CO11 are parallel with load LED1；It is set to the secondary side of the transformer T1
The cathode of the other end connection diode Dn4 of the capacitance Cbn of the side winding Nsn, the anode of the diode Dn4 connect output
Ground；
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes
Diode Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn of the transformer T1
The other end connect respectively with the cathode of the anode of the diode Dn2 and diode Dn3, the cathode of the diode Dn2 with
The anode connection of the output filter capacitor COn2, the anode of the diode Dn3 and the output filter capacitor COn2's is negative
Pole connection, the cathode of the output filter capacitor COn2 connect output ground, the load LED (n+1) and the output filter capacitor
COn2 is in parallel.
In the LED illumination driving circuit of no several levels electric current output of the present invention, the other end of each capacitance Cbn
It is connect with the cathode of the diode D (n+1) 1, the anode of the diode D (n+1) 1 connects the next stage vice-side winding Ns
(n+1) other end connection of the capacitance Cb (n+1) of side.
The invention further relates to a kind of LED illumination driving circuits of no several levels electric current output, including a high-frequency ac source AC
With several transformers, the high-frequency ac source AC is connected in parallel on the both ends of the primary side winding of each transformer；Each adjacent vice-side winding
One end connect one end of respective capacitance Cbn respectively, and one end of adjacent vice-side winding is replaced with Same Name of Ends with non-same polarity
Occur；The other end of each capacitance Cbn passes through the capacitance Cb (n+1) of diode D (n+1) 1 and next stage vice-side winding
Other end connection, the n is integer greater than 0；
The other end for being set to the capacitance Cb1 of the side vice-side winding Ns1 is also connected with the anode of diode D11, and described two
The anode of the cathode connection output filter capacitor CO11 of pole pipe D11, the cathode of the output filter capacitor CO11 connect output ground, institute
The both ends for stating output filter capacitor CO11 are parallel with load LED1, are set to the another of the capacitance Cbn of the side vice-side winding Nsn
The cathode of end connection diode Dn4, the anode of the diode Dn4 connect output ground；
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes
Diode Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn of the transformer T1
The other end connect respectively with the cathode of the anode of the diode Dn2 and diode Dn3, the cathode of the diode Dn2 with
The anode connection of the output filter capacitor COn2, the anode of the diode Dn3 and the output filter capacitor COn2's is negative
Pole connection, the cathode of the output filter capacitor COn2 connect output ground, the load LED (n+1) and the output filter capacitor
COn2 is in parallel.
In the LED illumination driving circuit of no several levels electric current output of the present invention, the other end of each capacitance Cbn
It is connect with the cathode of the diode D (n+1) 1, the anode of the diode D (n+1) 1 connects the next stage vice-side winding Ns
(n+1) other end connection of the capacitance Cb (n+1) of side.
The invention further relates to a kind of LED illumination driving circuits of no several levels electric current output, including a high-frequency ac source AC
The both ends of the primary side winding Np of the transformer T1 are connected in parallel on transformer a T1, the high-frequency ac source AC；The transformation
Device T1 includes several vice-side windings, and one end of each adjacent vice-side winding is to be separately connected first output rectification circuit；Institute
Stating the first output rectification circuit includes capacitance Cbn, diode Dn1, output filter capacitor COn1 and load LED (2n-
1), the n is the integer greater than 0, and one end of the capacitance Cbn connects the one of the vice-side winding Nsn of the transformer T1
End, the other end of the capacitance Cbn connect with the anode of the diode Dn1, the cathode of the diode Dn1 with it is described
The anode connection of output filter capacitor COn1, the cathode of the output filter capacitor COn1 are connected to the first output rectification of upper level
The anode of diode D (n-1) 1 in circuit, load LED (2n-1) are connected in parallel on the both ends of the output filter capacitor COn1；
The cathode of output filter capacitor CO11 in first output rectification circuit of the first order connects output ground, afterbody
The anode of diode Dn1 in first output rectification circuit is also connected with the cathode of diode Dn4, the anode of the diode Dn4
Connect output ground；
The other end of each vice-side winding connects second output rectification circuit respectively, and second output rectification circuit wraps
Include diode Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding of the transformer T1
The other end of Nsn is connect with the cathode of the anode of the diode Dn2 and diode Dn3 respectively, the cathode of the diode Dn2
It is connect with the anode of the output filter capacitor COn2, the anode of the diode Dn3 is with the output filter capacitor COn2's
Cathode connection, the cathode of the output filter capacitor COn2 connect output ground, the load LED (n+1) and the output filtered electrical
It is in parallel to hold COn2.
In the LED illumination driving circuit of no several levels electric current output of the present invention, the high-frequency ac source AC is to appoint
The switch inversion topology for both-end excitation of anticipating.
The LED illumination driving circuit for implementing no several levels electric current output of the invention, has the advantages that due to passing through
Charge between multiple capacitors exchanges and the principle of the ampere-second of each capacitor balance, realizes without the accurate constant current between several levels output,
Only it need to increase multiple windings in the outlet side of main transformer, in addition a small amount of rectifier cell, so that it may it realizes and is exported without several levels, circuit
Simply, it is easy extension, at low cost, compared with tradition realizes the scheme of secondary Bian Junliu, the present invention is used to flow without additional
Magnetic cell only needs capacitor, and transformer can extend to no several levels, and realizes and flow without several levels, therefore is able to achieve no several levels output
Between accurate constant current, circuit is simple, be easy extension, cost is relatively low, can reduce volume.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the electrical block diagram of the flow equalizing circuit of Diode series coupling inductance in traditional technology；
Fig. 2 is the electrical block diagram of the two-way flow equalizing circuit of secondary side series connection capacitance in traditional technology；
Fig. 3 is the circuit structure signal of four Lu Junliu output rectification circuits in traditional technology using auxiliary coupling inductance
Figure；
Fig. 4 is the concatenated electrical block diagram for realizing secondary side flow equalizing circuit of transformer primary side in traditional technology；
Fig. 5 is three road constant current outputs in LED illumination driving circuit first embodiment of the present invention without the output of several levels electric current
The electrical block diagram of rectification circuit；
Fig. 6 is the electrical block diagram of the rectification circuit of three road constant current output of modified in second embodiment；
Fig. 7 is the electrical block diagram of the rectification circuit of four road constant current outputs in 3rd embodiment；
Fig. 8 is the electrical block diagram of the rectification circuit of the road modified n+1 constant current output in fourth embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 5 is three road constant current outputs in LED illumination driving circuit first embodiment of the present invention without the output of several levels electric current
The electrical block diagram of rectification circuit.In first embodiment, which includes one
An a high-frequency ac source AC and transformer T1, high-frequency ac source AC are connected in parallel on the both ends of the primary side winding Np of transformer T1；Become
Depressor T1 include several vice-side windings Ns1, Ns2 ..., Nsn, one end (connecing capacitance terminal) of each adjacent vice-side winding is respectively and respectively
It is connected from one end of capacitance Cbn, and one end of adjacent vice-side winding is alternately present with Same Name of Ends and non-same polarity；Each blocking
The other end of capacitor Cbn is by diode D (n+1) 1 with the capacitance Cb's (n+1) of the side next stage vice-side winding Ns (n+1)
Other end connection, n are the integer greater than 0；Specifically, the yin of the other end of each capacitance Cbn and the diode D (n+1) 1
Pole connection, the capacitance Cb's (n+1) of anode connection side next stage vice-side winding Ns (n+1) of diode D (n+1) 1 is another
End connection.
The other end for being set to the capacitance Cb1 of the side first order vice-side winding Ns1 of transformer T1 is also connected with diode
The anode of D11, the anode of the cathode connection output filter capacitor CO11 of diode D11, the cathode of output filter capacitor CO11 connect
Output ground, the both ends of output filter capacitor CO11 are parallel with load LED1；Be set to the side vice-side winding Nsn of transformer T1 every
The cathode of the other end connection diode Dn4 of straight capacitor Cbn, the anode of diode Dn4 connect output ground；
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes two poles
Pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the other end of the vice-side winding Nsn of transformer T1
It is connect respectively with the cathode of the anode of the diode Dn2 and diode Dn3, the cathode and output filter capacitor of diode Dn2
The anode connection of COn2, the anode of diode Dn3 are connect with the cathode of output filter capacitor COn2, output filter capacitor COn2's
Cathode connects output ground, and load LED (n+1) is in parallel with output filter capacitor COn2.
It is the circuit diagram when load of tri- tunnel Dang You exports in above-mentioned technical proposal in Fig. 5, i.e. circuit in Fig. 5 is able to achieve negative
Carry LED1, load LED2 and load LED3) stream output.The rectification circuit of tri- road constant current output of Fig. 5 Zhong includes a height
Frequency alternating current source AC, transformer T1, primary side winding Np and two vice-side windings Ns1, Ns2, high-frequency ac source AC be connected in parallel on primary side around
The both ends of group Np, one end of the termination capacitance Cb1 of the same name of first order vice-side winding Ns1, first order vice-side winding Ns1's is another
The anode of one terminating diode D12 and the cathode of D13, the anode of the cathode connection output filter capacitor CO12 of diode D12, two
The cathode of the anode connection output filter capacitor CO12 of pole pipe D13.Load LED2 is connected in parallel on the both ends of output filter capacitor CO12,
The cathode of output filter capacitor CO12 is as output ground.The anode of the other end connection diode D11 of capacitance Cb1, simultaneously
Connect the cathode of diode D21；The anode of the cathode connection output filter capacitor CO11 of diode D11, output filter capacitor
The cathode of CO11 connects output ground.Load LED1 is connected in parallel on the both ends of output filter capacitor CO11.
One end of one end connection capacitance Cb2 of second level vice-side winding Ns2, second level vice-side winding Ns2's is of the same name
End is separately connected the anode of diode D22 and the cathode of diode D23, and the cathode of diode D22 connects output filter capacitor
The anode of CO22, the cathode of output filter capacitor CO22 connect output ground, and load LED3 is connected in parallel on the two of output filter capacitor CO22
End.The other end of capacitance Cb2 is separately connected the anode of D21 and the cathode of diode D24, and the anode of diode D24 connects defeated
Out.The cathode of diode D21 connects the anode of diode D11.
It is noted that high-frequency ac source AC is the switch inversion topology of any both-end excitation, circuit structure can be made in this way
Building becomes relatively simple.In this first embodiment, the vice-side winding of capacitance Cbn and transformer connected in series be can be interchanged
Position does not influence the performance of circuit, without changing the connection type of other elements in circuit.
The present invention, without the additional magnetic cell for flowing, only needs compared with tradition realizes the scheme of secondary Bian Junliu
Capacitor, cost is relatively low, and efficiency is higher.Volume can be reduced using capacitor, density is high.Transformer can extend to no several levels, and real
Now flowed without several levels.The transformer that modularized design can also be used, realizes the modularization exported without several levels.
Fig. 6 is the electrical block diagram of the rectification circuit of three road constant current output of modified in second embodiment, and second is real
It applies in example, which includes a high-frequency ac source AC and several transformers, height
Frequency alternating current source AC is connected in parallel on the both ends of the primary side winding of each transformer；One end (connecing capacitance terminal) of each adjacent vice-side winding connects respectively
One end of respective capacitance Cbn, and one end of adjacent vice-side winding is alternately present with Same Name of Ends and non-same polarity；Each blocking electricity
The other end for holding Cbn is connect by diode D (n+1) 1 with the other end of the capacitance Cb (n+1) of next stage vice-side winding, n
For the integer greater than 0, specifically, the other end of each capacitance Cbn is connect with the cathode of the diode D (n+1) 1, two poles
The other end connection of the capacitance Cb (n+1) of anode connection side next stage vice-side winding Ns (n+1) of pipe D (n+1) 1.
The other end for being set to the capacitance Cb1 of the side first order vice-side winding Ns1 is also connected with the anode of diode D11,
The anode of the cathode connection output filter capacitor CO11 of diode D11, the cathode of output filter capacitor CO11 connect output ground, export
The both ends of filter capacitor CO11 are parallel with load LED1, are set to the other end connection of the capacitance Cbn of the side vice-side winding Nsn
The anode of the cathode of diode Dn4, diode Dn4 connects output ground.
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes two poles
Pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the other end of the vice-side winding Nsn of transformer T1
It is connect respectively with the cathode of the anode of diode Dn2 and diode Dn3, the cathode and output filter capacitor COn2 of diode Dn2
Anode connection, the anode of diode Dn3 connect with the cathode of output filter capacitor COn2, the cathode of output filter capacitor COn2
Output ground is connect, load LED (n+1) is in parallel with output filter capacitor COn2.
Technical solution in Fig. 6 is a kind of improvement for Fig. 5, in Fig. 6, the primary side of two independent transformer T1 and T2 around
Group Np1 and Np2 is respectively connected in parallel on the both ends of high-frequency ac source AC, convenient for the modularization and standardized designs of transformer, by simultaneously
Join the quantity of transformer and increasing and decreasing the change of output number is flexibly met for corresponding auxiliary element, it is not necessary to modify main transformers
Parameter.
The rectification circuit of three road constant current output of modified in Fig. 6 includes high-frequency ac source AC, a transformer T1 and change
The vice-side winding of the primary side winding Np2 of the primary side winding Np1 of depressor T2, transformer T1, transformer T2, transformer T1 be Ns1 and
The vice-side winding Ns2 of transformer T2, high-frequency ac source AC are connected in parallel on the primary side of the primary side winding Np1 and transformer T2 of transformer T1
The both ends of winding Np2, the vice-side winding of transformer T1 are that the Same Name of Ends of Ns1 connects one end of capacitance Cb1, and the other end is in succession
The anode of diode D12 and the cathode of diode D12 are connect, the cathode of diode D12 connects the anode of output filter capacitor CO12,
The cathode of the anode connection output filter capacitor CO12 of diode D13.Load LED2 is connected in parallel on the two of output filter capacitor CO12
End, the cathode of output filter capacitor CO12 is as output ground.The anode of the other end connection diode D11 of capacitance Cb1, together
When connect diode D21 cathode；The anode of the cathode connection output filter capacitor CO11 of diode D11, output filter capacitor
The cathode of CO11 is connected to output ground, and load LED1 is connected in parallel on the both ends of output filter capacitor CO11.
One end of one end connection capacitance Cb2 of the vice-side winding Ns2 of transformer T2, the vice-side winding of transformer T2
The anode of the Same Name of Ends connection diode D22 of Ns2 and the cathode of diode D23, the cathode connection output filtered electrical of diode D22
Hold the anode of CO22, the cathode of output filter capacitor CO22 connects output ground, and load LED3 is connected in parallel on output filter capacitor CO22's
Both ends.The anode of the other end connection diode D21 of capacitance Cb2 and the cathode of diode D24, the anode of diode D24
Connect output ground, the anode of the cathode connection diode D11 of diode D21.
Fig. 7 is the electrical block diagram of the rectification circuit of four road constant current outputs in 3rd embodiment, in 3rd embodiment,
The LED illumination driving circuit without the output of several levels electric current includes an a high-frequency ac source AC and transformer T1, high-frequency ac
Source AC is connected in parallel on the both ends of the primary side winding Np of transformer T1；Transformer T1 include several vice-side windings Ns1, Ns2 ...,
Nsn, one end of each adjacent vice-side winding are to be separately connected first output rectification circuit；First output rectification circuit includes
Capacitance Cbn, diode Dn1, output filter capacitor COn1 and load LED (2n-1), n are the integer greater than 0, capacitance
One end of the vice-side winding Nsn of one end connection transformer T1 of Cbn, the other end of capacitance Cbn and the anode of diode Dn1
Connection, the cathode of diode Dn1 are connect with the anode of output filter capacitor COn1, and the cathode of output filter capacitor COn1 is connected to
The anode of diode D (n-1) 1 in first output rectification circuit of level-one, load LED (2n-1) are connected in parallel on output filter capacitor
The both ends of COn1.
The cathode of output filter capacitor CO11 in first output rectification circuit of the first order connects output ground, afterbody
The anode of diode Dn1 in first output rectification circuit is also connected with the cathode of diode Dn4, and the anode of diode Dn4 connects defeated
Out.
The other end of each vice-side winding connects second output rectification circuit respectively, and the second output rectification circuit includes two
Pole pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn's of transformer T1 is another
End is connect with the cathode of the anode of diode Dn2 and diode Dn3 respectively, the cathode and output filter capacitor of diode Dn2
The anode connection of COn2, the anode of diode Dn3 are connect with the cathode of output filter capacitor COn2, output filter capacitor COn2's
Cathode connects output ground, and load LED (n+1) is in parallel with output filter capacitor COn2.
Technical solution in Fig. 7 is improved as the another kind of Fig. 5, is solved the equal flow problem of four tunnels load, that is, is solved load
LED1, load LED2, load LED3 and the equal flow problem for loading LED4.The rectification circuit of tetra- road constant current output of Fig. 7 Zhong includes
One high-frequency ac source AC, transformer T1, primary side winding Np and two vice-side windings Ns1, Ns2, high-frequency ac source AC are connected in parallel on
The both ends of the primary side winding Np of transformer T1, the one of the Same Name of Ends connection capacitance Cb1 of the vice-side winding Ns1 of transformer T1
End, the other end of the vice-side winding Ns1 of transformer T1 are separately connected the anode of diode D12 and the cathode of diode D13, two poles
The anode of the cathode connection output filter capacitor CO12 of pipe D12, the anode connection output filter capacitor CO12's of diode D13 is negative
Pole.Load LED2 is connected in parallel on the both ends of output filter capacitor CO12, and the cathode of output filter capacitor CO12 is as output ground.Blocking
The anode of the other end connection diode D11 of capacitor Cb1；The cathode of diode D11 is connected to the anode of output filter capacitor CO11,
With being connected to out, load LED1 is connected in parallel on the both ends of output filter capacitor CO11 to the cathode of output filter capacitor CO11.
One end of one end connection capacitance Cb2 of the vice-side winding Ns2 of transformer T1, the vice-side winding of transformer T1
The Same Name of Ends of Ns2 is separately connected the anode of diode D22 and the cathode of diode D23, the cathode connection output filter of diode D22
The anode of wave capacitor CO22, the cathode of output filter capacitor CO22 connect output ground, and load LED3 is connected in parallel on output filter capacitor
The both ends of CO22.The anode of the other end difference diode D21 of capacitance Cb2 and the cathode of diode D24, diode D24
Anode connect output ground.The anode of the cathode connection output filter capacitor CO21 of diode D21, output filter capacitor CO21's is negative
The anode of pole connection diode D11.Load LED3 is connected in parallel on the both ends of output filter capacitor CO21.
Fig. 8 is the electrical block diagram of the rectification circuit of the road modified n+1 constant current output in fourth embodiment, in Fig. 8
A kind of improvement of the technical solution as Fig. 6, solve the equal flow problem of the road n+1 load LED output.The road modified n+1 in Fig. 8
The rectification circuit of constant current output include AC, n, a high-frequency ac source transformer T1, T2 ..., Tn, the primary side of transformer T1 around
Organize Np1, the vice-side winding Ns1 of the primary side winding Npn of the primary side winding Np2 of transformer T2, transformer Tn, transformer T1, transformation
The vice-side winding Nsn of the vice-side winding Ns2 and transformer Tn of device T2.High-frequency ac source AC is connected in parallel on the original of all transformers
Side winding Np1, Np2 ..., the both ends of Npn.
One end of the Same Name of Ends connection capacitance Cb1 of the vice-side winding Ns1 of transformer T1, the vice-side winding of transformer T1
The other end of Ns1 is separately connected the anode of diode D12 and the cathode of diode D13, the cathode connection output filter of diode D12
The anode of wave capacitor CO12, the cathode of the anode connection CO12 of diode D13.Load LED2 is connected in parallel on output filter capacitor CO12
Both ends, the cathode of output filter capacitor CO12 is as output ground.The sun of the other end connection diode D11 of capacitance Cb1
Pole, while connecting the cathode of diode D21；The anode of the cathode connection output filter capacitor CO11 of diode D11, output filtering
The cathode of capacitor CO11 connects output ground.Load LED1 is connected in parallel on the both ends of output filter capacitor CO11.The secondary side of transformer T2 around
One end of the non-same polarity connection capacitance Cb2 of group Ns2, the Same Name of Ends of the vice-side winding Ns2 of transformer T2 are separately connected two
The anode of pole pipe D22 and the cathode of diode D23, the anode of the cathode connection output filter capacitor CO22 of diode D22, output
The cathode of filter capacitor CO22 connects output ground, and load LED3 is connected in parallel on the both ends of output filter capacitor CO22.Capacitance Cb2's
The other end connects the cathode of diode Dn1 in the anode and next stage circuit of diode D21.
Analogize the connection of n-th of winding corresponding (n+1)th tunnel output with this connection type, at the same the secondary side of transformer Tn around
One end of the connection capacitance Cbn and capacitance Cb (n-1) of the vice-side winding Ns (n-1) of group Nsn and transformer Tn-1 are
Same Name of Ends is alternately present with non-same polarity；Two in the anode connection afterbody circuit of diode Dn1 in afterbody circuit
The anode of the cathode of pole pipe Dn4, diode Dn4 connects output ground.
Load in first output rectification circuit is LED (2n-1)；It, can as a kind of deformation to previously mentioned scheme
With by load LED (2n-1) and diode Dn1 transposition.
In short, the principle that the present invention is exchanged by the charge between multiple capacitors and the ampere-second of each capacitor balances, realizes nothing
Accurate constant current between several levels output.Only it need to increase multiple windings in the outlet side of main transformer, in addition a small amount of rectifier cell, just
No several levels output may be implemented, circuit is relatively simple, is easy extension, cost is relatively low.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of LED illumination driving circuit of no several levels electric current output, which is characterized in that including a high-frequency ac source AC and one
A transformer T1, the high-frequency ac source AC are connected in parallel on the both ends of the primary side winding Np of the transformer T1；The transformer T1
Including several vice-side windings, one end of each adjacent vice-side winding is connect with one end of respective capacitance Cbn respectively, and adjacent
One end of vice-side winding is alternately present with Same Name of Ends and non-same polarity；The other end of each capacitance Cbn passes through diode D (n+
1) it 1 is connect with the other end of the capacitance Cb (n+1) of the side next stage vice-side winding Ns (n+1), the n is the integer greater than 0；
The other end for being set to the capacitance Cb1 of the side vice-side winding Ns1 of the transformer T1 is also connected with the sun of diode D11
Pole, the anode of the cathode connection output filter capacitor CO11 of the diode D11, the cathode of the output filter capacitor CO11 connect
Output ground, the both ends of the output filter capacitor CO11 are parallel with load LED1；It is set to the vice-side winding of the transformer T1
The cathode of the other end connection diode Dn4 of the capacitance Cbn of the side Nsn, the anode of the diode Dn4 connect output ground；
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes two poles
Pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn's of the transformer T1 is another
One end is connect with the cathode of the anode of the diode Dn2 and diode Dn3 respectively, the cathode of the diode Dn2 with it is described
The cathode of the anode connection of output filter capacitor COn2, the anode of the diode Dn3 and the output filter capacitor COn2 connect
It connects, the cathode of the output filter capacitor COn2 meets output ground, the load LED (n+1) and the output filter capacitor COn2
It is in parallel.
2. the LED illumination driving circuit of no several levels electric current output according to claim 1, which is characterized in that each blocking electricity
The other end for holding Cbn is connect with the cathode of the diode D (n+1) 1, under the anode connection of the diode D (n+1) 1 is described
The other end of the capacitance Cb (n+1) of the side level-one vice-side winding Ns (n+1) connects.
3. a kind of LED illumination driving circuit of no several levels electric current output, which is characterized in that if including a high-frequency ac source AC and
Dry transformer, the high-frequency ac source AC are connected in parallel on the both ends of the primary side winding of each transformer；The one of each adjacent vice-side winding
End connects one end of respective capacitance Cbn respectively, and one end of adjacent vice-side winding is alternately present with Same Name of Ends and non-same polarity；
The other end of each capacitance Cbn is another by diode D (n+1) the 1 and capacitance Cb's (n+1) of next stage vice-side winding
End connection, the n are the integer greater than 0；
The other end for being set to the capacitance Cb1 of the side vice-side winding Ns1 is also connected with the anode of diode D11, the diode
The anode of the cathode connection output filter capacitor CO11 of D11, the cathode of the output filter capacitor CO11 connects output ground, described defeated
The both ends of filter capacitor CO11 are parallel with load LED1 out, and the other end for being set to the capacitance Cbn of the side vice-side winding Nsn connects
The cathode of diode Dn4 is connect, the anode of the diode Dn4 connects output ground；
The other end of each vice-side winding is separately connected an output rectification circuit, and each output rectification circuit includes two poles
Pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn's of the transformer T1 is another
One end is connect with the cathode of the anode of the diode Dn2 and diode Dn3 respectively, the cathode of the diode Dn2 with it is described
The cathode of the anode connection of output filter capacitor COn2, the anode of the diode Dn3 and the output filter capacitor COn2 connect
It connects, the cathode of the output filter capacitor COn2 meets output ground, the load LED (n+1) and the output filter capacitor COn2
It is in parallel.
4. the LED illumination driving circuit of no several levels electric current output according to claim 3, which is characterized in that each blocking electricity
The other end for holding Cbn is connect with the cathode of the diode D (n+1) 1, under the anode connection of the diode D (n+1) 1 is described
The other end of the capacitance Cb (n+1) of the side level-one vice-side winding Ns (n+1) connects.
5. a kind of LED illumination driving circuit of no several levels electric current output, which is characterized in that including a high-frequency ac source AC and one
A transformer T1, the high-frequency ac source AC are connected in parallel on the both ends of the primary side winding Np of the transformer T1；The transformer T1
Including several vice-side windings, one end of each adjacent vice-side winding is to be separately connected first output rectification circuit；Described
One output rectification circuit includes capacitance Cbn, diode Dn1, output filter capacitor COn1 and load LED (2n-1), institute
Stating n is the integer greater than 0, and one end of the capacitance Cbn connects one end of the vice-side winding Nsn of the transformer T1, institute
The other end for stating capacitance Cbn is connect with the anode of the diode Dn1, the cathode of the diode Dn1 and the output
The anode connection of filter capacitor COn1, the cathode of the output filter capacitor COn1 are connected to the first output rectification circuit of upper level
The anode of middle diode D (n-1) 1, load LED (2n-1) are connected in parallel on the both ends of the output filter capacitor COn1；
The cathode of output filter capacitor CO11 in first output rectification circuit of the first order connects output ground, and the first of afterbody
The anode of diode Dn1 in output rectification circuit is also connected with the cathode of diode Dn4, and the anode of the diode Dn4 connects defeated
Out；
The other end of each vice-side winding connects second output rectification circuit respectively, and second output rectification circuit includes two
Pole pipe Dn2, diode Dn3, output filter capacitor COn2 and load LED (n+1), the vice-side winding Nsn's of the transformer T1
The other end is connect with the cathode of the anode of the diode Dn2 and diode Dn3 respectively, the cathode of the diode Dn2 and institute
State the anode connection of output filter capacitor COn2, the cathode of the anode of the diode Dn3 and the output filter capacitor COn2
Connection, the cathode of the output filter capacitor COn2 connect output ground, the load LED (n+1) and the output filter capacitor
COn2 is in parallel.
6. the LED illumination driving circuit of no several levels electric current output according to claim 5, which is characterized in that the high frequency
Alternating current source AC is the switch inversion topology of any both-end excitation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710652301.6A CN109392210A (en) | 2017-08-02 | 2017-08-02 | The LED illumination driving circuit of no several levels electric current output |
| PCT/CN2017/119908 WO2019024417A1 (en) | 2017-08-02 | 2017-12-29 | Led illumination driving circuit of multi-stage current outputs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710652301.6A CN109392210A (en) | 2017-08-02 | 2017-08-02 | The LED illumination driving circuit of no several levels electric current output |
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| CN109392210A true CN109392210A (en) | 2019-02-26 |
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| CN201710652301.6A Pending CN109392210A (en) | 2017-08-02 | 2017-08-02 | The LED illumination driving circuit of no several levels electric current output |
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| WO (1) | WO2019024417A1 (en) |
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| CN111896798B (en) * | 2020-08-04 | 2022-12-09 | 中车青岛四方车辆研究所有限公司 | Method and device for detecting output unbalanced power of auxiliary converter |
| CN113179568B (en) * | 2021-04-09 | 2022-12-20 | 深圳市立创普电源技术有限公司 | Multi-output constant-current control circuit and driving power supply |
| CN113709941B (en) * | 2021-09-09 | 2024-03-08 | 深圳市优仕拓科技有限公司 | Circuit of non-isolated multichannel intelligent power supply of high PF value |
| CN115498619B (en) * | 2022-09-29 | 2024-06-04 | 厦门大学 | Direct-current micro-grid group flexible interconnection system based on differential current compensation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548151A (en) * | 2012-01-13 | 2012-07-04 | 浙江大学 | LED (light emitting diode) driver for multi-path constant current output |
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| CN101778506B (en) * | 2009-12-28 | 2013-07-03 | 英飞特电子（杭州）股份有限公司 | Drive circuit for realizing accurate constant current of multiple LEDs |
| CN101772246B (en) * | 2010-02-24 | 2013-01-16 | 英飞特电子（杭州）股份有限公司 | Multi-resonance circuit suitable for LED multi-path precise constant current driver |
| CN102299633B (en) * | 2010-06-24 | 2015-07-08 | 英飞特电子（杭州）股份有限公司 | Direct current-direct current (DC) conversion circuit |
| CN102595725B (en) * | 2012-02-13 | 2014-10-29 | 浙江大学 | Multi-path light emitting diode (LED) driving circuit capable of accurately equalizing flow |
| WO2016028224A1 (en) * | 2014-08-18 | 2016-02-25 | National University Of Singapore | Single-stage multi-string led driver with dimming |
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| CN102548151A (en) * | 2012-01-13 | 2012-07-04 | 浙江大学 | LED (light emitting diode) driver for multi-path constant current output |
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