CN101017730A - Transformer structure - Google Patents
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- CN101017730A CN101017730A CN 200610003299 CN200610003299A CN101017730A CN 101017730 A CN101017730 A CN 101017730A CN 200610003299 CN200610003299 CN 200610003299 CN 200610003299 A CN200610003299 A CN 200610003299A CN 101017730 A CN101017730 A CN 101017730A
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Abstract
The provided transformer structure comprises: an original side coil, some secondary side circuit units every with a PCB composite including one or more PCB with secondary conductive coil, and at least an output rectifying circuit included an output filter and a rectifying device set on PCB composite. This invention reduces loss, and increases circuit efficiency.
Description
Technical field
The present invention relates to a kind of transformer device structure of on-off mode power supply, particularly high power, high-frequency transformer device structure (transformer design).
Background technology
In power supply today towards high power density development, in order to realize higher efficient, except the choose reasonable and circuit parameter optimization of this body structure of circuit, components and parts, non-traditional electrical design such as mechanism, thermal design and rational printed circuit board (PCB) (PCB:Printed Circuit Board) layout, what become in the actual design of power supply is more and more important.
In the middle of the power supply design, the high frequencyization that high power density caused makes that the design of magnetic core element is particularly important, and in addition, the design of power transformer also is crucial, and it is in high-power, more apparent its importance of frequency applications occasion.For example, as shown in Figure 1, overall structure for traditional DC-DC (DC/DC) converter, wherein the secondary side of transformer 1 comprises parts such as transformer secondary (s econdary) winding, output rectifier 3 and output filter 4, the primary side of transformer 1 then comprises the former limit of transformer (primary) winding and former limit switch element 2, switch element 2 connects input 5, and output filter 4 connects load (load) 6.The frequency that improves contactor can reduce the volume of magnetic core element effectively, yet high frequencyization has been brought many problems to the design of Windings of transformer.Kelvin effect of the lead under the high-frequency work (skin depth effect) and approach effect will make the extra power loss of generation between Transformer Winding self and the winding, and be especially obvious in the occasion of big electric current output.In addition, outlet side structure for traditional transformer, as shown in Figure 2, the winding of transformer 1 connects former limit switch element 2 and output rectifier 3 and filter 4, and the rectifier 3 of outlet side and filter segment device 4 are installed on the printing board PCB, in addition, Zp represents to draw online spurious impedance.Such configuration causes the secondary side of transformer 1 to go between the distance of output rectifier can be big and alternating current path is longer, it draws online parasitic equivalent resistance and can produce very big loss in the occasion of the big electric current of high frequency as a result, and the switching loss that causes switching device increases, and influences the reliability and the efficient of circuit.Similarly, the output winding of traditional powerful transformer 1 also can be owing to end effect (terminal effect) makes terminal loss (terminal loss) increase greatly.
Therefore, preferable transformer winding structure of design and outlet side structure have become the reliability that influences circuit and a key factor of efficient.Therefore, based on the shortcoming of above-mentioned prior art, and there are many adverse influences in traditional transformer, the invention provides a kind of transformer device structure, thereby can reduce the efficient of the length that exchanges lead-in wire and the loss raising integrated circuit of transformer effectively.
Summary of the invention
The excessive problem of outlet loss in view of the output winding of transformer in the prior art the invention provides a kind of transformer device structure, can reduce the length and the loss of transformer that exchange lead-in wire effectively, thus the efficient of raising integrated circuit.
The object of the invention is to provide a transformer device structure, said structure mainly utilizes former limit and secondary to adopt staggered winding arrangement architecture, and the lead-in wire terminal of secondary side winding is taked rough vertical configuration mode with leading-out terminal, therefore reduced the loss of thermal resistance and output widely, made to prolong and increased the delivery efficiency and the stability of transformer the useful life of transformer.
Another object of the present invention is to provide a kind of transformer device structure, said structure can utilize the parallel connection of former limit, secondary parallel connection, or the combination of other different unit, to cooperate the application of real output.
According to above purpose, the invention provides a kind of transformer device structure, comprising:
One primary coil;
A plurality of secondary circuits unit, each described secondary circuit unit comprises a printed circuit board (PCB) complex; Described printed circuit board (PCB) complex comprises at least one printed circuit board (PCB) that disposes the secondary conductor coils; And at least one output rectification circuit, being disposed on the printed circuit board (PCB) complex, wherein said output rectification circuit comprises output filter and rectifying device.
Described filter and rectifying device are between two printed circuit board (PCB) complexs.
Also comprise a chip for driving on the described printed circuit board (PCB) complex, be disposed on the printed circuit board (PCB).
Former limit, secondary can be replaced.
And the lead-in wire terminal of the secondary conductor coils of described printed circuit board (PCB) complex is rough vertical with leading-out terminal.
Described transformer comprises a plurality of primary coils.
Described output rectification circuit also comprises a rectifier switch, and this rectifier switch operating frequency is greater than 100Khz.
Described transformer device structure also comprises at least two primary coil parallel connections, at least two secondary circuit unit outputs in parallel.
Described transformer device structure also comprises at least two primary coil series connection, at least two secondary circuit unit outputs in parallel; Wherein at least one secondary circuit unit is independently exported.
Each primary coil and secondary circuit unit take alternating expression to arrange.
A plurality of primary coils comprise the multilayer winding, and each layer winding of a primary coil and secondary circuit units alternately are arranged.
Described transformer device structure also comprises a dielectric, isolates primary coil and secondary circuit unit.
Described transformer device structure also comprises a mask layer, is disposed between primary coil and the first former limit, secondary circuit unit and the 1st secondary printed circuit board (PCB) winding.Wherein each primary coil and secondary circuit unit take alternating expression to arrange.
The present invention also provides a kind of high frequency transformer, comprising:
A primary coil and a plurality of secondary coil;
An iron core;
Each transformer secondary coil is connected at least one rectifying device;
A minimizing ripple device that comprises at least one electric capacity is connected to rectifying device, these high frequency transformer characteristics are: have polylith current rectifying and wave filtering circuit substrate, at least three conductor regions that have mutual isolation on each current rectifying and wave filtering circuit substrate, two outputs of at least one secondary coil are connected respectively to first conductor region and second conductor region of circuit substrate, and the direct voltage that described minimizing ripple device is connected to after the 3rd conductor region and the output adjusting arrives load.
Beneficial effect of the present invention is, reduces the length of interchange lead-in wire and the loss of transformer effectively, thereby improves the efficient of integrated circuit.
Description of drawings
Fig. 1 shows the overall structure figure of traditional DC-DC (DC/DC) transformer;
Fig. 2 show traditional transformer once with the structure of secondary side;
Fig. 3 shows a kind of LLC series resonant circuit of half-bridge;
Fig. 4 shows transformer assembling assumption diagram of the present invention;
Fig. 5 A and Fig. 5 B show that the inside winding of traditional sandwich winding transformer and alternating expression winding of the present invention (interleaved) transformer distributes in the magnetomotive force of vertical direction;
Fig. 6 A and Fig. 6 B show the equivalent thermal resistance model of traditional transformer and transformer of the present invention;
Fig. 7 A and Fig. 7 B show the equivalent circuit diagram of traditional transformer and use integrated technology transformer of the present invention;
Fig. 8 A and Fig. 8 B show that the secondary side of transformer is the concrete structure schematic diagram of printed circuit board (PCB) winding under the circle situation;
Fig. 9 A and Fig. 9 B show the influence that the different terminals form of transformer is caused;
Figure 10 shows the structure chart of former limit winding;
Figure 11 shows that Circuit Fault on Secondary Transformer is the schematic diagram of the unit that former secondary is formed under the multiturn situation;
Figure 12 shows the positive and negative double-layer structure figure of secondary side a slice printed circuit board (PCB) winding;
Output rectifier adds the structure chart of radiator front and back under Figure 13 A and Figure 13 B demonstration secondary side multiturn situation;
Figure 14 shows the schematic diagram of the printed circuit board (PCB) winding of the different numbers of turn;
Figure 15 shows the structure chart of former limit use printed circuit board (PCB) winding;
Figure 16 shows the winding construction of former lateral dominance with the printed circuit board (PCB) integrated technology;
Figure 17 shows that former secondary all is integrated in the structure on the same printed circuit board (PCB);
Figure 18 shows the structure that adopts integrated two unit of a slice printed circuit board (PCB) while;
Figure 19 shows that multiple unit more is integrated into the structural representation of a printed circuit board (PCB);
Figure 20 A and Figure 20 B show the schematic diagram of the possible former secondary winding configuration of transformer device structure;
Figure 21 A and Figure 21 B show the schematic diagram of the possible secondary side combining form of transformer device structure;
Figure 22 shows the different topology of the spendable secondary side of printed circuit board (PCB) complex;
Figure 23 A and Figure 23 B show the structural representation of the safety solution of two kinds of former secondary;
Figure 24 shows another kind of safety solution;
Figure 25 shows a kind of scheme that mask layer solves electromagnetic interference that adds.
Embodiment
It is as follows that embodiments of the present invention is described in detail in conjunction with the accompanying drawings.
Please refer to diagram, wherein shown only is for preferred embodiment of the present invention is described, is not in order to restriction the present invention.As shown in Figure 3, be the structure chart of the LLC series resonant circuit of half-bridge, Circuit Fault on Secondary Transformer complex output rectification unit (containing output filter capacitor) wherein has been described.Transformer device structure of the present invention goes for high power transformer, and is not limited to high power transformer, and the transformer of other power also can be suitable for.Usually, the magnetizing inductance (Lm) of inductance (Ls), electric capacity (Cs) and transformer constitutes a LLC resonant circuit.Two main switch S1 and S2 constitute a half-bridge structure, realize the constant of output voltage by changing switching frequency.Resonant circuit is connected between the mid point and ground of half-bridge, and therefore, resonant capacitance Cs also plays a part capacitance simultaneously.At outlet side, rectifier diode D1 and D2 constitute centre tapped rectification circuit, and rectifier diode is directly connected on the output capacitance Co.In addition, Z1, Z2, Z3 represent to draw online spurious impedance.For an embodiment, described LLC resonant circuit comprises 1.2kWLLC-SRC (Series Resonant Converter, series resonant inverter), the output current of this circuit can reach 100 amperes (A), and operating frequency can reach the MHz grade, and this circuit structure needs its output filter unit only to contain output filter capacitor Co.Therefore, the design of traditional transformer not only can produce the terminal loss (terminal loss) of previous discussion and the loss of alternating current (AC) lead-in wire in so high frequency and big current applications, also will cause many defectives such as many thermal design problem and Transformer Winding loss be excessive.Transformer device structure of the present invention is to be integrated (integrated) output filter capacitor and Transformer Winding, and preferably to solve above-mentioned these problems, its transformer overall structure as shown in Figure 4.
Please refer to Fig. 4, wherein the former limit 4a of transformer can adopt the line of single core or multicore, and according to certain direction coiling at grade, it comprises two-layer identical winding and is chained together as the former limit of a unit.The secondary 3c of transformer adopts the winding of printed circuit board (PCB) (PCB), with the output rectification circuit of secondary side comprise filter capacitor, and rectifier all integrated (integrated) on printed circuit board (PCB).In other words, secondary 3c is the printed circuit board (PCB) winding of Circuit Fault on Secondary Transformer complex, former limit 4a is the two-layer former limit winding of polyphone, and secondary 3c is embedded a unit 5b who becomes whole transformer among the former limit 4a, utilizes group 3a, 3b unshakable in one's determination that a plurality of unit 5b are integrated into whole transformer.For an embodiment, described output rectification circuit comprises a rectifier switch, and the switching frequency of its work is greater than 100Khz.For the design of integrated transformers, can utilize several such unit 5b parallel connections to form, the work of then optimizing whole transformer can be reduced to optimizes each unit in parallel.Big more power just needs many more unit 5b to be together in parallel.
Subsequently, please refer to Fig. 5 A and Fig. 5 B, its inside winding that shows traditional sandwich winding transformer and alternating expression winding of the present invention (inte rleaved) transformer respectively distributes in the magnetomotive force of vertical direction.Wherein 6a is that former limit winding, 7 is that secondary winding, 8 is magnetic core, can obtain the Distribution of Magnetic Field of transformer inside by Ampere circuit law, shown in the curve among the figure, wherein magnetomotive force (Magnetic Motive Force:MMF) directly influences the loss on the Transformer Winding, in other words, the winding loss of the big more transformer of magnetomotive force inside is big more.Fig. 5 A is that the transformer and the magnetomotive force thereof of traditional sandwich winding distributes, and Fig. 5 B is that the transformer and the magnetomotive force thereof of cross structure of the present invention distributes, and compares from two figure and learns that cross structure produces littler Transformer Winding loss, and promptly copper loss shows to land and reduces.
Please refer to Fig. 6 A and Fig. 6 B, see it from the angle of thermal design, the heat generation source major part of transformer is winding and iron core, it seems traditional Transformer Winding from horizontal direction, its equivalent thermal resistance 9 is similar to series connection, as shown in Figure 6A, so the radiating condition of its inner winding is very abominable, and has bigger heat problem; And transformer of the present invention has changed the winding arrangement mode, and its equivalent thermal resistance 9 is similar to parallel connection, and shown in Fig. 6 B, its all windings all can directly spread to heat the transformer outside, therefore, reduces thermal resistance significantly and improves heat-sinking capability.
Please refer to Fig. 7 A and Fig. 7 B, adopt the difference of the integrated front and back of secondary circuit.Traditional transformer, its equivalent electric circuit are shown in Fig. 7 A, and it takes traditional winding mode, and just carry out filtering at last; And transformer of the present invention goes for powerful transformer, and it comprises the parallel connection of several unit (cell) 10, and wherein each all can disperse power effectively.The structure of transformer adopting of the present invention former limit parallel connection, secondary parallel connection, and be the integrated technology and the staggered winding construction of former secondary of secondary with traditional difference.Can simplify the Circuit Fault on Secondary Transformer terminal structure after integrated, and reduce terminal loss, and the length of (AC) path that obviously reduces output AC, the influence of parasitic parameter reduced simultaneously to circuit.Moreover original transformer alternating (AC) terminal can become direct current (DC) terminal.
Please refer to Fig. 8 A and Fig. 8 B, it shows secondary side printed circuit board (PCB) winding integrated technology.Secondary side (being the transformer secondary) integrated technology is the core of design of transformer, and its detailed structure is shown in Fig. 8 A and Fig. 8 B.Printed circuit board (PCB) is made up of up and down two-layer (layer), and Fig. 8 A and Fig. 8 B have represented the structure of upper strata (toplayer) and lower floor (bottom layer) respectively, and it connects output and input respectively.For an embodiment, Circuit Fault on Secondary Transformer comprises: integrated (integrated) is at the output filter capacitor 11 in printed circuit board (PCB) front, conductor coils 12, chip for driving 13 and the output rectifier 15 of printed circuit board (PCB).In addition, the printed circuit board (PCB) tow sides have through hole 14, are used for the connection of the double-layer winding up and down of secondary.For centre tapped transformer device structure, the bilevel structure of its printed circuit board (PCB) is symmetry fully.Occasion at low-voltage, high-current adopts synchronous rectification usually, the printed circuit board (PCB) winding of the secondary side of this transformer is in integrated (integrated) output filter capacitor, adopt synchronous rectification and integrated drive chips, output synchronous rectification transistor (MOSFET).The interchange path of as can be seen from the figure exporting is very short, can reduce loss effectively under the big current applications of high frequency.
Please refer to Fig. 9 A and Fig. 9 B, it shows the influence that the different terminals form of transformer is caused respectively.Adopt the printed circuit board (PCB) winding to help reducing terminals loss (terminal loss).What Fig. 9 A represented is the terminal structure of traditional Copper Foil winding secondary side, its shortcoming is the loss at terminals 16 places, because the lead-in wire terminal and the leading-out terminal configured in parallel of the winding of secondary side, therefore the magnetic field that former limit alternating current ip produces makes outlet side current i s skewness, and causes great loss.And the present invention adopts the overlapping output end structure of Fig. 9 B, because the lead-in wire terminal of the winding of secondary side is rough vertical with leading-out terminal, therefore cancel out each other in the magnetic field that former and deputy limit alternating current is produced, and loss can reduce widely.For common Copper Foil winding, the terminals relative complex, occasion in parallel is then complicated more in a plurality of unit, adopts the method for winding of printed circuit board (PCB) then can address this problem than being easier to.In addition, the lead-in wire terminal of the winding of former limit primary side also can be taked rough vertical configuration mode with leading-out terminal.
In addition, because the good heat radiating condition of Copper Foil on the printed circuit board (PCB) winding does not need extra fin to offer output rectifier,, greatly improve power density so can save volume effectively.According to the practical design result, adopt transformer device structure of the present invention under same power grade, can save about 40% volume, it goes for the high power density occasion.
Please refer to Figure 10, it shows the structure chart of former limit winding.What the winding on former limit adopted is single core or multicore cable 17, for example Copper Foil forms by certain direction coiling, and each unit comprises two-layer winding 17 and contacts in connector 18 parts, and be installed in the both sides of secondary printed circuit board (PCB) winding respectively, as shown in Figure 4.In addition, connector 18 is promptly drawn it outside also can being positioned at former limit winding as shown in figure 11.As mentioned above, adopt printed circuit board (PCB) winding complex secondary side output filter capacitor and output rectifier based on secondary, and the transformer device structure that adopts some unit crisscross parallel to connect, be transformer device structure proposed by the invention.In addition, it must be emphasized that the selection of the magnetic core of transformer of the present invention is not limited only to the kenel shown in the figure, also available other various difform core type.
Please refer to Figure 11, it shows that Circuit Fault on Secondary Transformer is the schematic diagram of the unit that former secondary is formed under the multiturn situation.Lower for output voltage, the situation that winding is got a circle as previously mentioned.When winding is two circles, can utilize two printed circuit board (PCB)s to be in series, for example utilize up and down two-layer Copper Foil winding 19 to constitute two circle windings.Similarly, output filter 20 complexs are on printed circuit board (PCB), and this filter 20 is a filter capacitor in the present embodiment; Output rectifier 21 is installed on the both sides of printed circuit board (PCB), and this output rectifier 21 is the output rectifying tube in the present embodiment.In other words, in the present embodiment, two printed circuit board (PCB) series connection become the printed circuit board (PCB) complex, wherein have one on the printed circuit board (PCB) and do not have complete filtering and rectifying device, and perhaps two all do not have complete filtering and rectifying device.As shown in figure 11, when two printed circuit board are folded mutually, have on filter 20 every block of plates, but rectifying device 21 is can two total; Also can have by filter on the contrary, be the printed circuit board (PCB) complex so constitute the polylith circuit board of complete filter rectification function.In addition, the winding 22 on former limit, similar Fig. 4, whole winding 22 and 19 is formed a unit.Wherein the printed circuit board (PCB) winding construction 19, as shown in figure 12, and its integrated output filter capacitor as can be seen, and consider the output rectifying tube is installed nearby, reduced the interchange path.Two-layer up and down Copper Foil gets up by through hole 23 polyphones.Several unit as shown in figure 11 are together in parallel can obtain whole transformer device structure, as shown in FIG. 13A.If the rectifier of output needs fin, can shown in Figure 13 B, add fin 24, the lead that this fin 24 also can be used for as output simultaneously serves multiple.
Similarly, transformer device structure of the present invention also can adopt the situation greater than two circles, and for example 2 or the N circle, it is as long as printed circuit board (PCB) winding of above-mentioned respective numbers in parallel can reach, as shown in figure 14.So transformer device structure of the present invention is applicable to multiturn printed circuit board (PCB) winding simultaneously and needs the situation of fin.In addition, also can integrated two unit on a slice printed circuit board (PCB), structure as shown in figure 18.Similarly, also be applicable to the more secondary unit situation of complex to the printed circuit board (PCB) together, structure as shown in figure 19.
Be similar to secondary, former limit can be adopted the printed circuit board (PCB) winding equally or be adopted the former limit of printed circuit board (PCB) complex switching circuit 25 to make, and it is respectively as Figure 15 and shown in Figure 16.In addition, similarly, former and deputy limit winding can be incorporated on the printed circuit board, as shown in figure 17.
Transformer of the present invention goes for the situation that original edge voltage is higher than secondary voltage, or secondary voltage is higher than the situation of original edge voltage, and it need with the winding exchange of former secondary promptly belong to transformer type of the present invention equally.In addition, for the combination of winding, transformer device structure both can be applicable to the parallel connection of former limit, secondary parallel connection, shown in Figure 20 B, equally also can be applied to the structure of the series connection of former limit, secondary parallel connection, shown in Figure 20 A.For secondary side, similarly different unit can be made up to obtain different output requirements, shown in Figure 21 B, perhaps every road is as independently load output, shown in Figure 21 A.
Aforementioned applied be the transformer of secondary centre cap half-wave rectifying circuit, the method of its IC printed board is suitable equally for the export structure of other any structures, full-bridge rectification output circuit for example, current multiplication rectification circuit etc., as shown in figure 22, according in like manner can be on the winding printed circuit board (PCB) output rectifier and filter complex.In addition, the output inductor shown in the figure can be the inductance that adds, and also can be the inductance of magnetic complex.
Because former limit, the secondary of transformer of the present invention are close together, and compare with traditional transformer, its safety problem seems more important.We can utilize and add dielectric 26 winding on former limit is encapsulated, to satisfy the safety class of insulation requirement of the former limit of transformer, secondary, shown in Figure 23 A.Or, utilize and on the printed circuit board (PCB) winding, coat coatings 27 or select three-layer insulated lead for use, to satisfy the safety requirement equally, shown in Figure 23 B.Similarly, also secondary printed circuit board (PCB) winding can be wrapped up with dielectric 28, to solve the safety problem, as shown in figure 24.
Among the design of power transformer, because the parasitic capacitance between Transformer Winding is bigger, in order to improve isolation effect to High-frequency Interference, can between Transformer Winding, increase one deck mask layer 29, Copper Foil for example, and with these mask layer 29 ground connection (length of earth connection should be lacked, otherwise can make its decay variation to disturbing on the contrary because of the impedance dividing potential drop of earth connection) as far as possible.Please refer to Figure 25, it is that typical single mask layer 29 adds between the former secondary both sides of transformer, to reduce electromagnetic interference.
Among some application scenarios, also can use the one deck in the multilayer board structure to use as mask layer, so promptly need not add Copper Foil.
Therefore, be difficult to satisfy strict requirement compared to the terminal loss and the heat dissipation problem of the transformer of prior art, technical solution proposed by the invention can satisfy low terminal loss and heat radiation requirement, will reach high circuit reliability and efficient simultaneously.
The foregoing description only is used to illustrate the present invention, but not in order to limit the present invention.
Claims (15)
1. a transformer device structure is characterized in that, comprising:
One primary coil;
A plurality of secondary circuits unit, each described secondary circuit unit comprises:
One printed circuit board (PCB) complex;
Described printed circuit board (PCB) complex comprises at least one printed circuit board (PCB) that disposes the secondary conductor coils; And
At least one output rectification circuit is disposed on the described printed circuit board (PCB) complex, and wherein this output rectification circuit comprises output filter and rectifying device.
2. transformer device structure as claimed in claim 1 is characterized in that described filter and rectifying device are between two printed circuit board (PCB) complexs.
3. transformer device structure as claimed in claim 1 is characterized in that, comprises a chip for driving on the described printed circuit board (PCB) complex.
4. transformer device structure as claimed in claim 1 is characterized in that, former limit, secondary can be replaced.
5. transformer device structure as claimed in claim 1 is characterized in that, the lead-in wire terminal of the secondary conductor coils of described printed circuit board (PCB) complex is rough vertical with leading-out terminal.
6. transformer device structure as claimed in claim 1 is characterized in that described output rectification circuit also comprises a rectifier switch, and this rectifier switch operating frequency is greater than 100Khz.
7. transformer device structure as claimed in claim 1 is characterized in that described transformer comprises a plurality of primary coils.
8. transformer device structure as claimed in claim 1 is characterized in that, also comprises at least two primary coil parallel connections, at least two secondary circuit unit outputs in parallel.
9. transformer device structure as claimed in claim 1 is characterized in that, also comprises at least two primary coil series connection, at least two secondary circuit unit outputs in parallel.
10. transformer device structure as claimed in claim 1 is characterized in that, at least one secondary circuit unit is independently exported.
11. transformer device structure as claimed in claim 7 is characterized in that, each primary coil and secondary circuit unit take alternating expression to arrange.
12. transformer device structure as claimed in claim 7 is characterized in that, a plurality of primary coils comprise the multilayer winding, and each layer winding of a primary coil and secondary circuit units alternately are arranged.
13. transformer device structure as claimed in claim 1 is characterized in that, also comprises a dielectric, isolates described primary coil and secondary circuit unit.
14. transformer device structure as claimed in claim 1 is characterized in that, also comprises a mask layer, is disposed between described primary coil and the secondary circuit unit.
15. a high frequency transformer is characterized in that, comprising:
A primary coil and a plurality of secondary coil;
An iron core;
Each transformer secondary coil is connected at least one rectifying device;
A minimizing ripple device that comprises at least one electric capacity is connected to described rectifying device;
Wherein, has polylith current rectifying and wave filtering circuit substrate, at least three conductor regions that have mutual isolation on each described current rectifying and wave filtering circuit substrate, two outputs of at least one secondary coil are connected respectively to first conductor region and second conductor region of circuit substrate, and the direct voltage that described minimizing ripple device is connected to after the 3rd conductor region and the output adjusting arrives load.
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| CNB2006100032991A CN100570768C (en) | 2006-02-08 | 2006-02-08 | Transformer device structure |
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| CNB2006100032991A CN100570768C (en) | 2006-02-08 | 2006-02-08 | Transformer device structure |
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Assignee: Delta Energy Technology (Shanghai) Co., Ltd. Assignor: Delta Optoelectronics Inc. Contract record no.: 2010990000774 Denomination of invention: Transformer structure Granted publication date: 20091216 License type: Exclusive License Open date: 20070815 Record date: 20100920 |