CN111312501B - Method for realizing multiple turn ratios of planar transformer - Google Patents
Method for realizing multiple turn ratios of planar transformer Download PDFInfo
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- CN111312501B CN111312501B CN202010251244.2A CN202010251244A CN111312501B CN 111312501 B CN111312501 B CN 111312501B CN 202010251244 A CN202010251244 A CN 202010251244A CN 111312501 B CN111312501 B CN 111312501B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
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Abstract
A method for realizing multiple turn ratios of planar transformer includes setting several primary windings on primary side of planar transformer, passing resistance between primary windingsR c In series, a resistor is arranged between the primary windingsR a 、R b In parallel, by means of a pair of resistorsR a 、R b 、R c Different resistors are selected to obtain the combination of serial connection and parallel connection of primary windings, and a plurality of secondary windings are arranged on the secondary side of the planar transformer to realize different turn ratios of the planar transformer. The method of the invention realizes different turn ratios of the transformer to meet the application occasions of various input and output voltages, saves the production cost, shortens the manufacturing period of the product and is suitable for the design and application of series products.
Description
Technical Field
The invention belongs to the technical field of electronic components and relates to a method for realizing multiple turn ratios of a planar transformer.
Background
The transformer is an important energy conversion device in a power supply system, and accounts for one fifth to one third of the whole system in terms of space and quality. With the development of power supply toward miniaturization and high power density, planar transformers are used due to their advantages of high efficiency, small size, light weight, etc.
Although the planar transformer has many advantages, the planar transformer has the disadvantages of high price, poor universality and long processing period due to the combination of the flat magnetic core and the multilayer printed board. On one hand, the flat transformer replaces a winding in the traditional transformer with a printed line, a coil needs to be designed by using a multilayer printed board, the number of layers of the printed board is not less than 4, the price of the printed board is multiplied along with the increase of the number of the layers of the board, and therefore the manufacturing cost of the flat transformer is far higher than that of the traditional transformer. On the other hand, different transformers need to be designed in different application occasions with different input and output voltages, the traditional transformer has low cost, simple manufacture and short production period, and can be designed to adapt to different occasions, while the planar transformer needs to design and put into production a plurality of multilayer printed boards according to the application occasions, the processing period of the multilayer printed boards is generally more than 1 week, and the product period is seriously influenced.
The traditional solution is to divide the multilayer printed board used by the planar transformer into a plurality of double-sided boards or 4-layer boards, and combine a plurality of printed boards through pins to achieve the use effect of the multilayer printed board.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for realizing multiple turn ratios of a planar transformer.
The technical problem to be solved by the invention is realized by the following technical scheme, and the invention is a method for realizing multiple turn ratios of a planar transformer, which is characterized in that a plurality of primary windings are arranged on the primary side of the planar transformer, and a resistor is arranged between the primary windingsR c In series, with a resistor between the primary windingsR a 、R b In parallel, by means of a pair of resistorsR a 、R b 、R c Different resistors are selected to obtain the combination of serial connection and parallel connection of primary windings, and a plurality of secondary windings are arranged on the secondary side of the planar transformer, so that different turn ratios of the primary windings and the secondary windings of the planar transformer are realized.
The technical problem to be solved by the invention can also be solved by the following technical scheme that a resistor is arranged between the head ends of the primary windingsR b Connected by a resistor between the tail ends of the primary windingsR a Connecting;
designing the serial connection mode and parallel connection mode of primary winding according to the turn ratio of planar transformer, selecting resistor at serial connection positionR c The connection is made while the resistance at the series position is disconnectedR a Resistance, and a method for manufacturing the sameR b The primary winding is connected with the primary winding; selecting resistors at parallel positionsR a Resistance, and a method for manufacturing the sameR b The connection is made while the resistor at the parallel position is disconnectedR c The resistor is connected with the primary winding to obtain the combination of serial connection and parallel connection of the primary winding, the primary winding and the secondary winding are arranged on each layer of panel of a multilayer printed board used by the planar transformer at intervals, and the resistorR a 、R b 、R c Are all 0 omega resistance.
The method uses EDA software to design the printed board, and the printed board is a multilayer board; when the printed board is designed, in order to reduce copper loss, make the current density distribution more uniform and the temperature rise lower, the primary winding and the secondary winding adopt a cross arrangement structure on the lamination; meanwhile, in order to reduce the parasitic capacitance between the primary winding and the secondary winding and weaken the electromagnetic interference of the parasitic capacitance on a power supply, the relative areas of the primary winding and the secondary winding are reduced in design.
The technical problem to be solved by the invention can also be realized by the following technical scheme that n +1 primary windings are arranged on the primary side of the planar transformer, and a resistor is arranged between the primary windingsR c Resistance between two adjacent primary windings connected in seriesR c 2, 2n resistors are arrangedR c By means of a pair of resistorsR c1 、R c2 ……R c2n Different resistors are selected to realize the series connection of the primary windings, and at most, the series connection of n +1 primary windings can be realized; one end of the primary winding passes through a resistorR b Connected by a resistor at the other end of the primary windingR a Connected by n resistorsR a And n resistorsR b By means of a pair of resistorsR a1 、R a2 ……R an 、R b1 、R b2 ……R bn Different resistors are selected to realize the parallel connection between the primary windings; the resistors are different in encapsulation and power according to the current in actual design to meet the design requirement; in addition, in order to adapt to the application occasions of large current, the winding method of multi-strand parallel winding of the traditional transformer needs to be realized through multiple layers of printed lines with the same number of turns in the planar transformer, so that the number of turns of the primary winding is actually the same, namely the primary winding is wound by the multi-strand parallel winding methodN p ；
The secondary winding is provided with m secondary windings, and the planar transformer can realize the following turn ratio: (N +1) Np/N sm The planar transformer is limited by printed board processing technology, product size and transformer performance, and the values of (n +1) and m should be finite integers, i.e. n =1, 2 … …, and m =1, 2 … ….
Compared with the prior art, the invention realizes different combination modes of the primary windings by a method of connecting a plurality of primary windings of the planar transformer in series and in parallel; in addition, according to the output voltage commonly used at present, a plurality of secondary windings are designed on the secondary side of the transformer, and finally, the requirements of different application occasions are met by realizing different turn ratios of the transformer. The method does not need to repeatedly change the design of the printed board, only needs to put into production a multilayer printed board, and can realize different turn ratios of the transformer by selecting a method of selecting a 0 omega resistor at the corresponding position of the printed board so as to meet the application occasions of various input and output voltages. The structure saves the production cost, shortens the manufacturing period of the product, and is suitable for the design and application of the series products.
Drawings
FIG. 1 is a circuit schematic of the method of the present invention;
FIG. 2 is a circuit diagram of the method according to embodiment 1 of the present invention;
FIG. 3 is a circuit diagram of the method according to embodiment 2 of the present invention;
FIG. 4 is a circuit diagram of the method according to embodiment 3 of the present invention;
FIG. 5 is a circuit diagram of the method according to embodiment 4 of the present invention;
fig. 6 is a wiring diagram of the primary windings used for 2, 3, 6, and 7 layers and the secondary windings used for 1, 4, 5, and 8 layers in example 5 of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings so that those skilled in the art can further understand the present invention without limiting the right of the present invention.
Referring to fig. 1, a method for realizing multiple turn ratios of a planar transformer is to arrange n +1 primary windings on a primary side of the planar transformer, wherein the primary windings are connected through a resistorR c Resistance between two adjacent primary windings connected in seriesR c 2, 2n resistors are arrangedR c By means of a pair of resistorsR c1 、R c2 ……R c2n Different resistors are selected to realize the series connection of the primary windings, and at most, the series connection of n +1 primary windings can be realized; one end of the primary winding passes through a resistorR b Connected by a resistor at the other end of the primary windingR a Connected by n resistorsR a And n resistorsR b By means of a pair of resistorsR a1 、R a2 ……R an 、R b1 、R b2 ……R bn Different resistors are selected to realize the parallel connection between the primary windings; the resistors are different in encapsulation and power according to the current in actual design to meet the design requirement; in addition, in order to adapt to the application occasions of large current, the winding method of multi-strand parallel winding of the traditional transformer needs to be realized through multiple layers of printed lines with the same number of turns in the planar transformer, so that the number of turns of the primary winding is actually the same, namely the primary winding is wound by the multi-strand parallel winding methodN p ；
The number of the secondary windings is m, and the planar transformer can realize the following turn ratio: (N +1) Np/N sm The planar transformer is limited by printed board processing technology, product size and transformer performance, and the values of (n +1) and m should be finite integers, i.e. n =1, 2 … …, and m =1, 2 … ….
The method takes the example that 4 windings are arranged on the primary side and the secondary side of a planar transformer, and 4 windings (N) on the primary side of the transformer are usedp1、Np2、Np3、Np4) The connection is made by 12 resistors, among which the series connection and the parallel connection between the primary windings are realized by selecting 0 Ω resistor, wherein, the connection is realized by the pairR c1 、R c2 ……R c6 Different resistors are selected to realize the series connection of the primary windings, and the series connection of at most 4 primary windings can be realized; by pairsR a1 、R a2 、R a3 、R b1 、R b2 、R b3 Different resistors are selected to realize parallel connection between primary windings, and the specific implementation mode is as follows:
referring to FIG. 2, example 1, the resistor is selectedR a1 、R a2 、R a3 、R b1 、R b2 、R b3 Is not selected for useR c1 、R c2 ……R c6 The method realizes Np1、Np2、Np3、Np4The turn ratio of the planar transformer is Np/N s1 ，Np/N s2 ，Np/N s3 ，Np/N s4 The device is suitable for occasions of inputting large current;
referring to FIG. 3, example 2, resistors were selectedR a2 、R a3 、R b1 、R b2 、R c1 、R c2 、R c5 、R c6 The method firstly uses a primary winding Np1And Np2Series, Np3And Np4Serially connected, and then parallelly connected, the planar transformer can realize 2N turns ratiop/N s1 ，2Np/N s2 ，2Np/N s3 ，2Np/N s4 ；
Referring to FIG. 4, example 3, the resistor is selectedR a3 、R b1 、R b2 、R b3 、R c1 、R c2 、R c3 、R c4 The method is to form a primary winding Np1、Np2、Np3In series to obtain 3NpAnd N is a winding ofp4When used as a single winding, the planar transformer can achieve a turn ratio of 3Np/N s1 ，3Np/N s2 ，3Np/N s3 ，3Np/N s4 ，Np/N s1 ，Np/N s2 ，Np/N s3 ，Np/N s4 ；
Referring to FIG. 5, example 4, the resistor is selectedR a1 、R a2 、R a3 、R b1 、R c3 、R c4 、R c5 、R c6 The method is to form a primary winding Np2、Np3、Np4In series to obtain 3NpAnd N is a winding ofp1When used as a single winding, the planar transformer can achieve a turn ratio of 3Np/N s1 ，3Np/N s2 ，3Np/N s3 ，3Np/N s4 ，Np/N s1 ，Np/N s2 ，Np/N s3 ，Np/N s4 。
In the above-mentioned embodiments 1 to 4, the number of turns of the primary winding is set to 11, i.e., Np1=Np2=Np3=Np4=Np=11, four parallel winding can be achieved at most; in order to realize various common output voltages, the number of turns of the secondary winding is Ns1=Ns3=3，Ns2=6，Ns4And = 4. Finally, the primary side of the transformer can realize the following turns ratio: (N +1) Np/N s1 ，(n+1)Np/N s2 ，(n+1)Np/N s4 （n=1、2、3）。
Embodiment 5, the method for realizing multiple turn ratios of a planar transformer described in embodiments 1 to 4, in which EDA software is used to design a printed board, and a structure in which primary and secondary windings are arranged in a staggered manner on a lamination layer can reduce copper loss, so that current density distribution is more uniform and temperature rise is lower; meanwhile, the relative area of the primary winding and the secondary winding is reduced in design, so that the parasitic capacitance between the primary winding and the secondary winding is reduced, and the electromagnetic interference of the parasitic capacitance to a power supply is weakened. Taking an 8-layer printed board as an example, the design of the primary winding and the secondary winding on the 8-layer printed board can be as follows:
1. 2, 5 and 6 layers are primary windings, and 3, 4, 7 and 8 layers are secondary windings;
2. the layers 3, 6 and 7 are primary windings, and the layers 1, 4, 5 and 8 are secondary windings;
3. the layers 4, 7 and 8 are primary windings, and the layers 1, 2, 5 and 6 are secondary windings;
1. the layers 4, 5 and 8 are primary windings, and the layers 2, 3, 6 and 7 are secondary windings;
wherein, fig. 6 is an embodiment in which 2, 3, 6, 7 layers adopt a primary winding, and 1, 4, 5, 8 layers adopt a secondary winding.
The method for realizing multiple turn ratios of the planar transformer realizes series connection and parallel connection of multiple primary windings of the planar transformer by using resistors, thereby realizing different combination modes of the primary windings; in addition, a plurality of secondary windings are designed on the secondary side of the transformer according to the output voltage commonly used at present, and finally, the requirements of different application occasions are met by realizing different turn ratios of the transformer; according to the design method, the design of the printed board does not need to be changed repeatedly, only one multilayer printed board needs to be produced, and different turn ratios of the transformer can be realized by selecting a 0 omega resistor at the corresponding position of the printed board, so that the application occasions of various input and output voltages are met. The design method saves the production cost, shortens the manufacturing period of the product, and is suitable for the design and application of the series products.
The above embodiments are only for clearly illustrating the technical solutions of the present invention, and the scope of the present invention includes but is not limited to the above embodiments, and any suitable changes or substitutions made by those skilled in the art in accordance with the claims of the present invention and shown in the drawings should fall within the scope of the present invention.
Claims (5)
1. A method for realizing multiple turn ratios of a planar transformer is characterized by comprising the following steps: the method comprises arranging multiple primary windings on the primary side of a planar transformer, and arranging a resistor R between the primary windingscIn series, between the primary windings via a resistor Ra、RbIn parallel, through a pair of resistors Ra、Rb、RcDifferent resistors are selected to obtain the combination of serial connection and parallel connection of primary windings, and a plurality of secondary windings are arranged on the secondary side of the planar transformer to realize different turn ratios of the primary windings and the secondary windings of the planar transformer;
the head end of the primary winding is connected with the other end of the primary winding through a resistor RbConnected by a resistor R between the tail ends of the primary windingsaConnecting; designing a series connection mode and a parallel connection mode of a primary winding according to the turn ratio of the planar transformer, and selecting a resistor R at the series connection positioncConnection is made while the resistor R at the series position is disconnectedaResistance RbThe primary winding is connected with the primary winding; selecting resistor R at parallel positionaAnd a resistor RbConnection is made while the resistor R at the parallel position is disconnectedcThe primary winding is connected with the primary winding so as to obtain the combination of serial connection and parallel connection of the primary winding;
the resistor Ra、Rb、RcAre all 0 omega resistance; the primary winding and the secondary winding are arranged on each layer of panel of the multilayer printed board used by the planar transformer at intervals.
2. The method for realizing multiple turns ratios of a planar transformer according to claim 1, wherein: resistance R between adjacent primary windings in series-connected primary windingscAt least two resistors connected in series, Rc1、Rc2。
3. The method for realizing multiple turns ratios of a planar transformer according to claim 1, wherein: the number of turns of the primary winding is the same.
4. The method for realizing multiple turns ratios of a planar transformer according to claim 1, wherein: the number of turns of the secondary winding is different.
5. The method for realizing multiple turns ratios of a planar transformer according to any one of claims 1-4, wherein: the method is that n +1 primary windings are arranged on the primary side of the planar transformer, and a resistor R is arranged between the primary windingscResistance R between two adjacent primary windings connected in seriesc2, 2n resistors R are arrangedcThrough a pair of resistors Rc1、Rc2……Rc2nDifferent resistors are selected to realize the series connection of the primary windings, and at most, the series connection of n +1 primary windings can be realized; the head end of the primary winding passes through a resistor RbConnected by a resistor R between the tail ends of the primary windingsaConnected by n resistors RaAnd n resistors RbThrough a pair of resistors Ra1、Ra2……Ran、Rb1、Rb2……RbnDifferent resistors are selected to realize the parallel connection between the primary windings;
the number of the secondary windings is m, and the transformer can realize the following turn ratio: (N +1) Np/NsmWherein n and m are finite integers greater than or equal to 1.
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| CN202010251244.2A CN111312501B (en) | 2020-04-01 | 2020-04-01 | Method for realizing multiple turn ratios of planar transformer |
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| CN111312501B true CN111312501B (en) | 2022-07-01 |
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