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CN101872674A - Current sharing transformer and its applicable power supply circuit - Google Patents

Current sharing transformer and its applicable power supply circuit Download PDF

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Publication number
CN101872674A
CN101872674A CN200910137702A CN200910137702A CN101872674A CN 101872674 A CN101872674 A CN 101872674A CN 200910137702 A CN200910137702 A CN 200910137702A CN 200910137702 A CN200910137702 A CN 200910137702A CN 101872674 A CN101872674 A CN 101872674A
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China
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magnetic
current
column
main
circuit
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CN200910137702A
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Chinese (zh)
Inventor
张世贤
柯柏年
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Delta Electronics Inc
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Delta Electronics Inc
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Abstract

The invention relates to a current-sharing transformer and a power supply circuit suitable for the same, wherein the current-sharing transformer comprises: the magnetic core comprises a main magnetic column and a plurality of auxiliary magnetic columns; the primary winding is wound on the main magnetic pole; and a plurality of secondary windings, which are respectively wound on the plurality of secondary magnetic columns, and each secondary winding is electrically connected with the direct current load through the rectifying circuit; the magnetic circuits between the plurality of auxiliary magnetic poles and the main magnetic pole are equal to each other, so that the current sharing transformer balances the current of each direct current load. The magnetic circuits between each secondary winding and each primary winding of the current sharing transformer are equal to each other, so when the current sharing transformer is applied to a power supply circuit for supplying power to a plurality of direct current loads, the power supply circuit can balance the current of the plurality of direct current loads, and the current of the plurality of direct current loads can be balanced only by using the current sharing transformer without increasing a current ripple and a control circuit, so the power supply circuit has the effects of simple circuit and low cost.

Description

Current-sharing transformer and suitable power supply circuits thereof
Technical field
The present invention relates to a kind of transformer, relate in particular to a kind of current-sharing transformer of the size of current in order to the balance multi-set DC laden and suitable power supply circuits thereof.
Background technology
In recent years because light-emitting diode (Light Emitting Diode, LED) breakthrough of manufacturing technology, make the luminosity and the luminous efficiency of light-emitting diode significantly promote, thereby make light-emitting diode replace known fluorescent tube gradually and become new illumination component, be widely used in for example illuminations such as home lighting device, car headlight device, hand-held lighting device, liquid crystal panel backlight, traffic sign indicator light, indication billboard and use.
Light-emitting diode is a DC load, at present in the application of multiple optical diode, because the characteristic of each light-emitting diode differs from one another, the size of current of feasible each light-emitting diode of flowing through all is not quite similar, so not only cause using the electronic installation of light-emitting diode, panel of LCD for example, luminosity is inhomogeneous, also can make significantly reduce the useful life of indivedual light-emitting diodes, and then make whole electronic installation suffer damage.
In order to improve the uneven problem of led current, there have been many led current balancing techniques to be used to improve this defective.United States Patent (USP) card US6,621,235 disclose a kind of current-balancing supply circuit of multi-group light-emitting diode, and as shown in Figure 1, this known current-balancing supply circuit comprises linear voltage adjuster 11 (linear regulator), low pass filter 12 and a plurality of current mirror M 1~M nWherein, the reference current I of the first input end of linear voltage adjuster 11 connection RefFor deciding electric current, produce corresponding output voltage to low pass filter 12, via outputing to current mirror M again after low pass filter 12 filtering in order to control linear voltage adjuster 11 1~M nGate terminal, make each current mirror M 1~M nExport identical electric current, therefore, every group is connected in current mirror M 1~M nLight-emitting diode have same current and luminosity.
Yet, because of utilizing linear voltage adjuster and current mirror, known current-balancing supply circuit reaches the purpose of the size of current of balance multi-group light-emitting diode, so circuit is comparatively complicated, in addition, also need to use to cause known current-balancing supply circuit cost costliness than multicomponent.Be with, how to develop a kind of current-sharing transformer of above-mentioned known technology defective and suitable power supply circuits thereof of improving, real problem for this area solution that presses at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of current-sharing transformer and suitable power supply circuits thereof, solve known current-balancing supply circuit and come balance multi-group light-emitting diode assembly, cause defectives such as complex circuit and cost costliness because of utilizing linear voltage adjuster or current mirror.
For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of current-sharing transformer is provided, it comprises: magnetic core comprises main magnetic post and a plurality of secondary magnetic post; Elementary winding is wound on the main magnetic post; And a plurality of secondary winding, be wound in respectively on a plurality of secondary magnetic posts, and each secondary winding is electrically connected with a DC load via a rectification circuit; The magnetic circuit of wherein a plurality of secondary magnetic posts and main magnetic intercolumniation is equal to each other, and makes the size of current of each DC load of current-sharing transformer balance.
For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply circuits are provided, in order to drive a plurality of DC load, power supply circuits comprise: switching circuit, in order to AC power to be provided; Current-sharing transformer is electrically connected with switching circuit, and comprises: magnetic core comprises main magnetic post and a plurality of secondary magnetic post; Elementary winding is wound on the main magnetic post, and is electrically connected with switching circuit, to receive AC power; And a plurality of secondary winding, be wound in respectively on a plurality of secondary magnetic posts, and each secondary winding is by the output AC induced current with the electromagnetic induction of elementary winding; A plurality of rectification circuits are electrically connected with a plurality of secondary winding and a plurality of DC load respectively, and each rectification circuit is given corresponding DC load in order to induced AC current is rectified into direct current; The magnetic circuit of wherein a plurality of secondary magnetic posts and main magnetic intercolumniation is equal to each other, and makes the size of current of a plurality of DC load of current-sharing transformer balance.
In sum, because each secondary winding of current-sharing transformer of the present invention and the magnetic circuit between elementary winding are equal to each other, therefore when be applied in order to provide power supply to the power supply circuits of a plurality of DC load in the time, but power supply circuits are the size of current of a plurality of DC load of balance just, but again because only need utilize the just size of current of a plurality of DC load of balance of current-sharing transformer, need not increase current echo and control circuit, so power supply circuits of the present invention just have the effect that circuit is simple and cost is less compared to known current-balancing supply circuit.
Description of drawings
Fig. 1: it is known led current balanced feeding circuit.
Fig. 2: it is the power supply circuits of the use current-sharing transformer of the preferred embodiment of the present invention.
Fig. 3: it is the structural representation of current-sharing transformer shown in Figure 2.
Fig. 4: it is that one of power supply circuits shown in Figure 2 change example.
Fig. 5: it is that one of current-sharing transformer shown in Figure 3 changes example.
Wherein, description of reference numerals is as follows:
11: the linear voltage adjuster
12: low pass filter
M 1~M n: current mirror
I Ref: decide electric current
2: power supply circuits
21: switching circuit
211: switch element
212: isolating transformer
213: elementary winding
214: secondary winding
22: current-sharing transformer
221,5: magnetic core
222: elementary winding
223: the first secondary winding
224: the second subprime winding
225: main magnetic post
226: the first secondary magnetic posts
227: the second secondary magnetic posts
23: the first rectification circuits
24: the second rectification circuits
25: the first filter circuits
26: the second filter circuits
28: the first light-emitting diode components
29: the second light-emitting diode components
51: for the third time the level winding
52: the four secondary winding
53: the three secondary magnetic posts
54: the fourth officer magnetic posts
L: inductance
D 1~D 4: diode
S 1~S 4: spacing distance
H 1~H 4: length
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, its neither departing from the scope of the present invention, and explanation wherein and be shown in the usefulness that ought explain in essence, but not in order to restriction the present invention.
Power supply circuits of the present invention are in order to drive a plurality of DC load and can make the current balance type of a plurality of DC load, make the luminosity of a plurality of DC load in fact all identical, wherein each DC load can be a light-emitting diode component, but not as limit, and light-emitting diode component can be made of at least one light-emitting diode.Below will be that light-emitting diode component is that demonstration example illustrates the technology of the present invention with the DC load.
See also Fig. 2, it is the electrical block diagram of power supply circuits of the use current-sharing transformer of the preferred embodiment of the present invention.As shown in the figure, power supply circuits 2 and a plurality of light-emitting diode components, for example first light-emitting diode component 28 shown in the figure and second light-emitting diode component 29 are electrically connected, these power supply circuits 2 required power supply when providing first light-emitting diode component 28 and second light-emitting diode component 29 shinny, direct current for example, and power supply circuits 2 mainly comprise a switching circuit 21, one current-sharing transformer 22 and a plurality of rectification circuit, for example 24 of first rectification circuit 23 shown in the figure and second rectification circuit, in present embodiment, first light-emitting diode component 28 is electrically connected with the output of first rectification circuit 23, second light-emitting diode component 29 is electrically connected with the output of second rectification circuit 24, and switching circuit 21 is then in order to export an AC power.
In present embodiment, current-sharing transformer 22 is electrically connected with switching circuit 21, first rectification circuit 23 and second rectification circuit 24 respectively, and current-sharing transformer 22 is respectively through first rectification circuit 23 and second rectification circuit 24 and be electrically connected with first light-emitting diode component 28 and second light-emitting diode component 29.Current-sharing transformer 22 mainly comprises magnetic core 221, elementary winding 222 and a plurality of secondary winding, wherein magnetic core 221 has a main magnetic post 225 and a plurality of secondary magnetic posts (as shown in Figure 3), main magnetic post 225 usefulness are twined for elementary winding 222, and a plurality of secondary magnetic posts are then used respectively for a plurality of secondary winding and twined.Elementary winding 222 is electrically connected with the output of switching circuit 21 and AC power that receiving key circuit 21 is exported, and a plurality of secondary winding, for example first secondary winding 223 and the second subprime winding 224 shown in the figure then is electrically connected with the input of first rectification circuit 23 and second rectification circuit 24 respectively.First secondary winding 223 and second subprime winding 224 are respectively by producing an alternating current impression electric current separately with the electromagnetic induction of elementary winding 222, and in present embodiment, current-sharing transformer 22 is equal to each other by the magnetic circuit that makes a plurality of secondary magnetic posts and main magnetic intercolumniation and the value of the alternating current impression electric current that first secondary winding 223 and second subprime winding 224 export separately is equal to each other, so but just balanced feeding circuit 2 size of current of giving first light-emitting diode component 28 and second light-emitting diode component 29 that provides of current-sharing transformer 22.
24 of first rectification circuit 23 and second rectification circuits become direct current with the alternating current impression current commutates of first secondary winding 223 and 224 outputs of second subprime winding respectively, to offer first light-emitting diode component 28 and second light-emitting diode component 29 respectively, make win light-emitting diode component 28 and second light-emitting diode component 29 shinny, simultaneously, first light-emitting diode component 28 and second light-emitting diode component 29 can receive the identical direct current of current value because of current-sharing transformer 22, and then produce identical in fact brightness.
Below will further specify the structure of current-sharing transformer 22 of the present invention.See also Fig. 3, and cooperate Fig. 2, wherein Fig. 3 is the structural representation of current-sharing transformer shown in Figure 2.As shown in the figure, current-sharing transformer 22 mainly comprises magnetic core 221, elementary winding 222, first secondary winding 223 and second subprime winding 224.Magnetic core 221 mainly comprises main magnetic post 225 and a plurality of secondary magnetic post, main magnetic post 225 usefulness are twined for elementary winding 222, and a plurality of secondary magnetic posts, the for example first secondary magnetic post 226 shown in the figure and secondary magnetic post 227 are for the second time then used respectively for level winding 223 and second subprime winding 224 twine for the first time.Therefore in addition, the first secondary magnetic post 226 and the second secondary magnetic post 227 are the axle center with main magnetic post 225, and mirror image is arranged at the relative both sides of main magnetic post 225, the spacing distance S of 225 on the first secondary magnetic post 226 and main magnetic post 1Equal the spacing distance S of 225 on the second secondary magnetic post 227 and main magnetic post in fact 2, in addition, in present embodiment, the length H of the first secondary magnetic post 226 1And the long-pending length H that is equal to the second secondary magnetic post 227 in fact of magnetic flux cross section 2And magnetic flux cross section is long-pending.
Because the spacing distance S that the first secondary magnetic post 226 and main magnetic post are 225 1Equal the spacing distance S of 225 on the second secondary magnetic post 227 and main magnetic post in fact 2, and the length H of the first secondary magnetic post 226 1And the long-pending length H that is equal to the second secondary magnetic post 227 in fact of magnetic flux cross section 2And magnetic flux cross section is long-pending, therefore the long-pending average length and the average magnetic flux cross section that in fact just can be equal to the magnetic circuit of 225 on the second secondary magnetic post 227 and main magnetic post of the average length of the first secondary magnetic post 226 and the magnetic circuit of 225 on main magnetic post and average magnetic flux cross section amassed, thus, the magnetic circuit of 225 on the first secondary magnetic post 226 and main magnetic post in fact just equals the magnetic circuit of 225 on the second secondary magnetic post 227 and main magnetic post.
In the foregoing description, can be between main magnetic post 225, the first secondary magnetic post 226 and second secondary magnetic post 227 threes but be not limited to integrated structure.Equal second subprime in fact around 224 coil turn as for the coil turn of first secondary winding 223.
Below schematic illustration current-sharing transformer 22 of the present invention can be reached the principle of current-sharing.Please consult Fig. 2 and Fig. 3 again, when power supply circuits 2 of the present invention begin action, and during the AC power of elementary winding 222 receiving key circuit 21 output of current-sharing transformer 22, the main magnetic post 225 of magnetic core 221 just can have a magnetic flux density, this moment, the first secondary magnetic post 226 and the second secondary magnetic post 227 also can have a magnetic flux density separately corresponding to main magnetic post 225, if the magnetic circuit of 225 on the first secondary magnetic post 226 and 227 pairs of main magnetic posts of the second secondary magnetic post is identical as the aforementioned, then the magnetic flux density of the first secondary magnetic post 226 equals the magnetic flux density of the second secondary magnetic post 227, and the value of both magnetic flux densities is all half of flux density value of main magnetic post 225.In addition, because average length and average magnetic flux cross section that the average length of the first secondary magnetic post 226 of the current-sharing transformer 22 of present embodiment and the magnetic circuit of 225 on main magnetic post and average magnetic flux cross section be long-pending to equal the magnetic circuit of 225 on the second secondary magnetic post 227 and main magnetic post are amassed, therefore the magnetic circuit of 225 on the first secondary magnetic post 226 and elementary main magnetic post is equal to the magnetic circuit of 225 on the second secondary magnetic post 227 and main magnetic post, moreover, first secondary winding 223 is equal to each other with the coil turn of second subprime winding 224, be with Ohm's law according to Ampere circuit law and magnetic circuit, the value of the alternating current impression electric current that first secondary winding 223 and second subprime winding 224 are exported just can be equal to each other, so power supply circuits 2 just can be by current-sharing transformer 22 and the size of current of balance first light-emitting diode component 28 and second light-emitting diode component 29, make the luminosity of first light-emitting diode component 28 equal the luminosity of second light-emitting diode component 29 in fact.
In some embodiment, switching circuit 21 can be but is not limited to comprise at least one switch element 211 and an isolating transformer 212.Isolating transformer 212 comprises an elementary winding 213 and a level winding 214, and wherein elementary winding 213 is electrically connected with switch element 211, and receives an input power supply V In, secondary winding 214 then is electrically connected with the elementary winding 222 of current-sharing transformer 22, and isolating transformer 212 is by the action of switch element 211 and will import power supply V InConversion is with the elementary winding 222 of output AC power source to current-sharing transformer 22.Certainly, the circuit structure of switching circuit 21 is not limited to as shown in Figure 2, and every have switch element, and utilizes the action of switch element and produce the switching circuit of AC power, all in protection scope of the present invention.
In some embodiment, first rectification circuit 23 comprises at least one diode, the first diode D for example shown in Figure 2 1And the second diode D 2, the first diode D 1And the second diode D 2Anode tap be electrically connected and the first diode D respectively with the both ends of first secondary winding 223 of current-sharing transformer 22 1The cathode terminal and the second diode D 2Cathode terminal then be electrically connected to each other, and all be electrically connected, and second rectification circuit 24 comprises at least one diode equally, the 3rd diode D for example shown in Figure 2 with first light-emitting diode component 28 3And the 4th diode D 4, the 3rd diode D 3And the 4th diode D 4Anode tap be electrically connected and the 3rd diode D respectively with the both ends of the second subprime winding 224 of current-sharing transformer 22 3Cathode terminal and the cathode terminal D of the 4th diode 4End then is electrically connected to each other, and all is electrically connected with second light-emitting diode component 29.
Certainly, in other embodiment, as shown in Figure 4, power supply circuits 2 also can be but are not limited to comprise a plurality of filter circuits, for example first filter circuit 25 shown in the figure and second filter circuit 26, first filter circuit 25 is serially connected with between first rectification circuit 23 and first light-emitting diode component 28, and second filter circuit 26 is serially connected with between second rectification circuit 24 and second light-emitting diode component 29, and first filter circuit 25 and second filter circuit 26 be the DC power supply filtering in order to first rectification circuit 23 and second rectification circuit 24 are exported respectively.In the foregoing description, first filter circuit 25 and second filter circuit 26 can be made of an inductance L respectively, but not as limit, in other embodiment, first filter circuit 25 and second filter circuit 26 also can be respectively be made of an electric capacity or a plurality of inductance and electric capacity.
See also Fig. 5, it is that one of current-sharing transformer shown in Figure 3 changes example.As shown in Figure 5, the structure of the current-sharing transformer 5 of present embodiment is similar to current-sharing transformer 22 shown in Figure 3, so the element representative structure and the functional similarity of same tag.But the current-sharing transformer of present embodiment 5 is compared to current-sharing transformer shown in Figure 3 22, the number of the secondary magnetic post of current-sharing transformer 5 magnetic cores of present embodiment is more, therefore can twine for more groups secondary winding, and then the balance size of current of multi-group light-emitting diode assembly more.
Below will further specify the structure of current-sharing transformer 5 of present embodiment and the principle of current-sharing.In present embodiment, the magnetic core 221 of current-sharing transformer 5 is except comprising the one first secondary magnetic post 226 and the second secondary magnetic post 227, also comprise one the 3rd a secondary magnetic post 53 and a fourth officer magnetic post 54, so 5 of current-sharing transformers also comprise a level winding 51 and one the 4th secondary winding 52 for the third time corresponding to the 3rd secondary magnetic post 53 and fourth officer magnetic post 54.Wherein, the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 are used respectively for level winding 51 and the 4th secondary winding 52 twine for the third time, and the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 are the axle center with main magnetic post 225, mirror image is arranged at the two relative outsides of main magnetic post 225, and make the first secondary magnetic post 226 between main magnetic post 225 and the 3rd secondary magnetic post 53, make the second secondary magnetic post 227 between main magnetic post 225 and fourth officer magnetic post 54, and because the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 are two outsides relatively that axle center and mirror image are arranged at main magnetic post 225 with main magnetic post 225, so the spacing distance S of 225 on the 3rd secondary magnetic post 53 and main magnetic post 3Equal the spacing distance S of 225 on fourth officer magnetic post 54 and main magnetic post 4In addition, in the foregoing description, the length H of the 3rd secondary magnetic post 53 3And the long-pending length H that equals fourth officer magnetic post 54 of magnetic flux cross section 4And magnetic flux cross section is long-pending.Spacing distance S by 225 on the 3rd secondary magnetic post 53 and main magnetic post 3Equal the spacing distance S of 225 on fourth officer magnetic post 54 and main magnetic post 4, and the length H of the 3rd secondary magnetic post 53 3And the long-pending length H that equals fourth officer magnetic post 54 of magnetic flux cross section 4And magnetic flux cross section is long-pending, therefore long-pending average length and the average magnetic flux cross section that in fact just is equal to the magnetic circuit of 225 on fourth officer magnetic post 54 and main magnetic post of the average length of the 3rd secondary magnetic post 53 and the magnetic circuit of 225 on main magnetic post and average magnetic flux cross section amassed, be with 225 on the 3rd secondary magnetic post 53 and main magnetic post magnetic circuit be equal to the magnetic circuit of 225 on fourth officer magnetic post 54 and main magnetic post in fact.
In addition, the length H of the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 3Or H 4Equal the first secondary magnetic post 226 or the length H of the second secondary magnetic post 227 in fact 1Or H 2And since the first secondary magnetic post 226 between main magnetic post 225 and the 3rd secondary magnetic post 53, and the second secondary magnetic post 227 is between main magnetic post 225 and fourth officer magnetic post 54, therefore the average length of magnetic circuit that can learn 225 on the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 and main magnetic post is in fact greater than the average length of the magnetic circuit of 225 on the first secondary magnetic post 226 or the second secondary magnetic post 227 and main magnetic post, and equal the magnetic circuit of 225 on the first secondary magnetic post 226 or the second secondary magnetic post 227 and main magnetic post for the magnetic circuit that makes 225 on the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 and main magnetic post, in present embodiment, make the long-pending magnetic flux cross section of magnetic flux cross section of the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 long-pending greater than the first secondary magnetic post 226 or the second secondary magnetic post 227, and the length of magnetic path that the long-pending size of the magnetic flux cross section of the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 is proportional to 225 on the length of magnetic path of 225 on the 3rd secondary magnetic post 53 and main magnetic post and the first secondary magnetic post 226 and the main magnetic post difference between the two or the length of magnetic path difference between the two of 225 on the length of magnetic path of 225 on fourth officer magnetic post 54 and main magnetic post and the second secondary magnetic post 227 and main magnetic post, make whereby that the long-pending or fourth officer magnetic post 54 of the average magnetic flux cross section of magnetic circuit of 225 on the 3rd secondary magnetic post 53 and main magnetic post and the average magnetic flux cross section of the magnetic circuit of 225 on main magnetic post are long-pending to be amassed greater than the average magnetic flux cross section of the magnetic circuit of 225 on the first secondary magnetic post 226 and main magnetic post in fact or the average magnetic flux cross section of the magnetic circuit of 225 on the second secondary magnetic post 227 and main magnetic post is amassed, thus, the magnetic circuit of 225 on the 3rd secondary magnetic post 53 or fourth officer magnetic post 54 and main magnetic post still can equal the magnetic circuit of 225 on the first secondary magnetic post 226 or the second secondary magnetic post 227 and main magnetic post in fact.
Again in the foregoing description, the coil turn of level winding 51 equals the coil turn of the 4th secondary winding 52 for the third time, and the coil turn of level winding 51 or the 4th secondary winding 52 also equals the coil turn of first secondary winding 223 or second subprime winding 224 for the third time.And first secondary magnetic post 226, second secondary magnetic post the 227, the 3rd secondary magnetic post 53, fourth officer magnetic post 54 and 225 on main magnetic post can be but be not limited to integrated structure.
It is similar to current-sharing transformer 22 shown in Figure 3 that the current-sharing transformer 5 of present embodiment can reach the principle of current-sharing, when the main magnetic post 225 of current-sharing transformer 5 has a magnetic flux density, the first secondary magnetic post 226, the second secondary magnetic post 227, the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 just can have a magnetic flux density separately corresponding to main magnetic post 225, if the first secondary magnetic post 226 as the aforementioned, the second secondary magnetic post 227, the magnetic circuit that the 3rd secondary magnetic post 53 and 54 pairs of main magnetic posts of fourth officer magnetic post are 225 is identical, the first secondary magnetic post 226 then, the second secondary magnetic post 227, the magnetic flux density of the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 is equal to each other, and the value of above-mentioned four magnetic flux density be all main magnetic post 225 magnetic flux density value 1/4th.In addition, because the first secondary magnetic post 226 of the current-sharing transformer 5 of present embodiment, the second secondary magnetic post 227, the magnetic circuit that the 3rd secondary magnetic post 53 and fourth officer magnetic post 54 and main magnetic post are 225 is equal to each other in fact, and first secondary winding 223, second subprime winding 224, the coil turn of level winding 51 and the 4th secondary winding 52 is equal to each other for the third time, therefore according to the Ohm's law of Ampere circuit law and magnetic circuit, first secondary winding 223, second subprime winding 224, the value of the alternating current impression electric current exported of level winding 51 and the 4th secondary winding 52 just can be equal to each other for the third time, so the current-sharing transformer 22 of present embodiment just can reach the purpose of current-sharing.
And as from the foregoing; as long as a plurality of secondary magnetic post of magnetic core of current-sharing transformer and the magnetic circuit of main magnetic intercolumniation are equal to each other; just exportable equal-sized alternating current impression electric current on a plurality of secondary winding of current-sharing transformer; make number that current-sharing transformer can corresponding secondary winding and the size of current of a plurality of DC load of balance; be with; the number of the secondary magnetic post of the magnetic core of current-sharing transformer; main magnetic post and secondary several secondary magnetic posts are arranged at the position of magnetic core or shape etc. and are not limited to as Fig. 3 and execution mode shown in Figure 5;, the magnetic circuit of a plurality of secondary magnetic post of magnetic core and main magnetic intercolumniation reaches the current-sharing transformer of the purpose of current-sharing as long as being equal to each other, all in protection scope of the present invention.
In sum, because each secondary winding of current-sharing transformer of the present invention and the magnetic circuit between elementary winding are equal to each other, therefore when be applied in order to provide power supply to the power supply circuits of a plurality of DC load in the time, but power supply circuits are the size of current of a plurality of DC load of balance just, but again because only need utilize the just size of current of a plurality of DC load of balance of current-sharing transformer, need not increase current echo and control circuit, so power supply circuits of the present invention just have the effect that circuit is simple and cost is less compared to known current-balancing supply circuit.
The present invention must be appointed by those of ordinary skills and executes the craftsman and think and make various modifications, however the claimed scope of the claim that neither disengaging is enclosed.

Claims (21)

1.一种均流变压器,其包含:1. A current equalizing transformer comprising: 一磁芯,包含一主磁柱及多个副磁柱;A magnetic core, including a main magnetic column and a plurality of auxiliary magnetic columns; 一初级绕组,缠绕于该主磁柱上;以及a primary winding wound on the main leg; and 多个次级绕组,分别缠绕于所述多个副磁柱上,且每一个该次级绕组经由一整流电路而与一直流负载电连接;a plurality of secondary windings respectively wound on the plurality of secondary magnetic columns, and each of the secondary windings is electrically connected to a DC load through a rectification circuit; 其中所述多个副磁柱与该主磁柱间的磁路彼此相等,使该均流变压器平衡每一个该直流负载的电流大小。The magnetic circuits between the plurality of secondary magnetic columns and the main magnetic column are equal to each other, so that the current sharing transformer can balance the current of each DC load. 2.如权利要求1所述的均流变压器,其中该整流电路包含至少一个二极管。2. The current sharing transformer as claimed in claim 1, wherein the rectification circuit comprises at least one diode. 3.如权利要求1所述的均流变压器,其中该直流负载为一发光二极管组件,且该发光二极管组件至少包含一个发光二极管。3. The current sharing transformer as claimed in claim 1, wherein the DC load is a light emitting diode assembly, and the light emitting diode assembly comprises at least one light emitting diode. 4.如权利要求1所述的均流变压器,其中所述多个次级绕组的线圈匝数彼此相等。4. The current sharing transformer as claimed in claim 1, wherein the turns of the plurality of secondary windings are equal to each other. 5.如权利要求4所述的均流变压器,其中所述多个副磁柱包含一第一副磁柱以及一第二副磁柱,该第一副磁柱以及该第二副磁柱以该主磁柱为轴心,镜像设置于该主磁柱的相对两侧,使该第一副磁柱与该主磁柱间的间隔距离等于该第二副磁柱与该主磁柱间的间隔距离。5. The current sharing transformer as claimed in claim 4, wherein the plurality of secondary magnetic columns comprise a first secondary magnetic column and a second secondary magnetic column, and the first secondary magnetic column and the second secondary magnetic column are The main magnetic column is the axis, and mirror images are arranged on opposite sides of the main magnetic column, so that the distance between the first secondary magnetic column and the main magnetic column is equal to the distance between the second secondary magnetic column and the main magnetic column. separation distance. 6.如权利要求5所述的均流变压器,其中该第一副磁柱的长度及磁通截面积等于该第二副磁柱的长度及磁通截面积,使该第一副磁柱与该主磁柱间的磁路的平均长度及平均磁通截面积相等于该第二副磁柱与该主磁柱间的磁路的平均长度及平均磁通截面积。6. The current sharing transformer as claimed in claim 5, wherein the length and the cross-sectional area of the magnetic flux of the first auxiliary magnetic column are equal to the length and the cross-sectional area of the magnetic flux of the second auxiliary magnetic column, so that the first auxiliary magnetic column and the cross-sectional area of the magnetic flux The average length and average flux sectional area of the magnetic circuit between the main magnetic columns are equal to the average length and average magnetic flux sectional area of the magnetic circuit between the second auxiliary magnetic column and the main magnetic column. 7.如权利要求5所述的均流变压器,其中该主磁柱、该第一副磁柱以及该第二副磁柱一体成型。7. The current sharing transformer as claimed in claim 5, wherein the main magnetic leg, the first secondary magnetic leg and the second secondary magnetic leg are integrally formed. 8.如权利要求6所述的均流变压器,其中所述多个副磁柱还包含一第三副磁柱以及一第四副磁柱,该第三副磁柱及该第四副磁柱以该主磁柱为轴心,镜像设置于该主磁柱的两相对外侧,使该第三副磁柱与该主磁柱间的间隔距离等于该第四副磁柱与该主磁柱间的间隔距离。8. The current sharing transformer as claimed in claim 6, wherein the plurality of secondary magnetic columns further comprise a third secondary magnetic column and a fourth secondary magnetic column, the third secondary magnetic column and the fourth secondary magnetic column With the main magnetic column as the axis, mirror images are arranged on two opposite outer sides of the main magnetic column, so that the distance between the third secondary magnetic column and the main magnetic column is equal to that between the fourth secondary magnetic column and the main magnetic column the separation distance. 9.如权利要求8所述的均流变压器,其中该第三磁副磁柱的长度及磁通截面积相等于该第四副磁柱的长度及磁通截面积,使该第三副磁柱与该主磁柱间的磁路的平均长度及平均磁通截面积相等于该第四副磁柱与该主磁柱间的磁路的平均长度及平均磁通截面积。9. The current sharing transformer as claimed in claim 8, wherein the length and the cross-sectional area of the magnetic flux of the third auxiliary magnetic column are equal to the length and the cross-sectional area of the magnetic flux of the fourth auxiliary magnetic column, so that the third auxiliary magnetic column The average length and average flux cross-sectional area of the magnetic circuit between the post and the main magnetic post are equal to the average length and average magnetic flux cross-sectional area of the magnetic circuit between the fourth secondary magnetic post and the main magnetic post. 10.如权利要求9所述的均流变压器,其中该第三副磁柱或该第四副磁柱与该主磁柱间的磁路的平均长度大于该第一副磁柱或该第二副磁柱与该主磁柱间的磁路的平均长度。10. The current equalizing transformer as claimed in claim 9, wherein the average length of the magnetic circuit between the third auxiliary magnetic leg or the fourth auxiliary magnetic leg and the main magnetic leg is greater than that of the first auxiliary magnetic leg or the second The average length of the magnetic circuit between the secondary magnetic column and the main magnetic column. 11.如权利要求10所述的均流变压器,其中该第三副磁柱及该第四副磁柱的磁通截面积大于该第一副磁柱及该第二副磁柱的磁通截面积,使该第三副磁柱或该第四副磁柱与该主磁柱间的磁路的平均磁通截面积大于该第一副磁柱或该第二副磁柱与该主磁柱间的磁路的平均磁通截面积。11. The current equalizing transformer as claimed in claim 10, wherein the flux cross-sectional areas of the third secondary magnetic leg and the fourth secondary magnetic leg are larger than the magnetic flux cross-sections of the first secondary magnetic leg and the second secondary magnetic leg area, so that the average flux cross-sectional area of the magnetic circuit between the third or fourth auxiliary magnetic column and the main magnetic column is greater than that of the first or second auxiliary magnetic column and the main magnetic column The average flux cross-sectional area of the magnetic circuit between. 12.如权利要求11所述的均流变压器,其中该第三副磁柱或是该第四副磁柱的磁通截面积正比于该第三副磁柱与该主磁柱间的磁路长度与该第一副磁柱与该主磁柱间的磁路长度两者间的差值或是该第四副磁柱与该主磁柱间的磁路长度与该第二副磁柱与该主磁柱间的磁路长度两者间的差值。12. The current equalizing transformer as claimed in claim 11, wherein the magnetic flux cross-sectional area of the third secondary magnetic leg or the fourth secondary magnetic leg is proportional to the magnetic circuit between the third secondary magnetic leg and the main magnetic leg The difference between the length and the magnetic path length between the first secondary magnetic column and the main magnetic column or the difference between the magnetic path length between the fourth secondary magnetic column and the main magnetic column and the second secondary magnetic column and The difference between the magnetic path length between the main magnetic legs. 13.如权利要求8所述的均流变压器,其中该第三磁副磁柱的长度或该第四副磁柱的长度等于该第一副磁柱的长度或该第二副磁柱的长度。13. The current sharing transformer as claimed in claim 8, wherein the length of the third magnetic sub-column or the length of the fourth sub-magnetic post is equal to the length of the first sub-magnetic post or the length of the second sub-magnetic post . 14.如权利要求8所述的均流变压器,其中该第一副磁柱位于该主磁柱以及该第三副磁柱之间,该第二副磁柱位于该主磁柱以及该第四副磁柱之间。14. The current equalizing transformer as claimed in claim 8, wherein the first secondary magnetic leg is located between the main magnetic leg and the third secondary magnetic leg, and the second secondary magnetic leg is located between the main magnetic leg and the fourth magnetic leg between the sub-columns. 15.如权利要求8所述的均流变压器,其中该主磁柱、该第一副磁柱、该第二副磁柱、该第三副磁柱以及该第四副磁柱一体成型。15. The current sharing transformer as claimed in claim 8, wherein the main magnetic leg, the first secondary magnetic leg, the second secondary magnetic leg, the third secondary magnetic leg and the fourth secondary magnetic leg are integrally formed. 16.一种供电电路,用以驱动多个直流负载,该供电电路包含:16. A power supply circuit for driving multiple DC loads, the power supply circuit comprising: 一开关电路,用以提供一交流电源;A switch circuit for providing an AC power supply; 一均流变压器,与该开关电路电连接,且包含:A current equalizing transformer, electrically connected to the switching circuit, and comprising: 一磁芯,包含一主磁柱及多个副磁柱;A magnetic core, including a main magnetic column and a plurality of secondary magnetic columns; 一初级绕组,缠绕于该主磁柱上,且与该开关电路电连接,以接收该交流电源;以及a primary winding wound on the main magnetic leg and electrically connected to the switching circuit to receive the AC power; and 多个次级绕组,分别缠绕于所述多个副磁柱上,且每一个该次级绕组借由与该初级绕组的电磁感应而输出一交流感应电流;A plurality of secondary windings are respectively wound on the plurality of secondary magnetic columns, and each of the secondary windings outputs an AC induction current through electromagnetic induction with the primary winding; 多个整流电路,分别与所述多个次级绕组以及所述多个直流负载电连接,每一个该整流电路用以将该感应交流电流整流成一直流电流给对应的该直流负载;A plurality of rectification circuits are respectively electrically connected to the plurality of secondary windings and the plurality of DC loads, and each of the rectification circuits is used to rectify the induced AC current into a DC current for the corresponding DC load; 其中所述多个副磁柱与该主磁柱间的磁路彼此相等,使该均流变压器平衡所述多个直流负载的电流大小。The magnetic circuits between the plurality of secondary magnetic columns and the main magnetic column are equal to each other, so that the current sharing transformer can balance the currents of the plurality of DC loads. 17.如权利要求16所述的供电电路,其中该供电电路包含一开关元件以及一隔离变压器,该隔离变压器接收一输入电源,并借由该关关元件的动作而输出一交流电源。17. The power supply circuit as claimed in claim 16, wherein the power supply circuit comprises a switch element and an isolation transformer, the isolation transformer receives an input power, and outputs an AC power through the operation of the switch element. 18.如权利要求16所述的供电电路,其中所述多个整流电路分别包含至少一个二极管。18. The power supply circuit according to claim 16, wherein each of the plurality of rectification circuits comprises at least one diode. 19.如权利要求16所述的供电电路,其中还具有多个滤波电路,分别串接于所述多个整流电路以及所述多个直流负载之间,用以滤波。19. The power supply circuit according to claim 16, further comprising a plurality of filter circuits connected in series between the plurality of rectification circuits and the plurality of DC loads for filtering. 20.如权利要求19所述的供电电路,其中每一个滤波电路包含一电感。20. The power supply circuit as claimed in claim 19, wherein each filter circuit comprises an inductor. 21.如权利要求14所述的供电电路,其中每一个所述多个直流负载为多个发光二极管组件,且每一个该发光二极管组件包含至少一个发光二极管。21. The power supply circuit as claimed in claim 14, wherein each of the plurality of DC loads is a plurality of LED assemblies, and each of the LED assemblies includes at least one LED.
CN200910137702A 2009-04-27 2009-04-27 Current sharing transformer and its applicable power supply circuit Pending CN101872674A (en)

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Application publication date: 20101027