CN108666067A - A kind of high efficiency integrated form LLC resonance transformers - Google Patents
A kind of high efficiency integrated form LLC resonance transformers Download PDFInfo
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- CN108666067A CN108666067A CN201711136438.2A CN201711136438A CN108666067A CN 108666067 A CN108666067 A CN 108666067A CN 201711136438 A CN201711136438 A CN 201711136438A CN 108666067 A CN108666067 A CN 108666067A
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- magnetosphere
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- 238000004804 winding Methods 0.000 claims abstract description 63
- 230000035699 permeability Effects 0.000 claims abstract description 51
- 230000000694 effects Effects 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
-
- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0066—Printed inductances with a magnetic layer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of high efficiency integrated form LLC resonance transformers.The transformer includes：Magnetic core 1, skeleton 2, low permeability magnetosphere 3, low permeability magnetosphere 4, armature winding 5, secondary windings 6, air gap 7；The air gap 7 is located at the center pillar of magnetic core 1；The low permeability magnetosphere 3 is by the center pillar tight of magnetic core 1；The armature winding is wound on inner layer；The secondary windings is wound on outer layer；The low permeability magnetosphere 4 is between armature winding 5 and secondary windings 6；The present invention solves traditional LLC resonance transformer and integrates difficulty in high-power applications, the defect that efficiency reduces, not only can by needed for LLC resonant converter resonant inductance and magnetizing inductance be integrated in transformer, and edge effect and the kindred effect of transformer can be reduced, effectively increase the efficiency of transformer energy transmission.
Description
Technical field
The present invention relates to power electronic technique and its application fields, being applied to LLC resonant converter more particularly to one kind
High efficiency integrated type transformer.
Background technology
A kind of outstanding switch power supply topological structure of the LLC resonant converter as high efficiency, high power density, low EMI, obtains
The concern of numerous scholars and engineer have been arrived, and has been obtained in the products such as communication power supply, LED power, electric vehicle charge power supply
Extensive use.LLC resonance transformers are close to the efficiency of circuit, power as the core devices in LLC resonant converter
Degree, reliability etc. are most important.The scheme of traditional LLC resonance transformers is usually used double flute skeleton, armature winding and time
Grade winding is isolated from each other rotating around in two slots, and there are larger leakage magnetic flux, this leakage magnetic flux is utilized to realize resonant cavity
Resonant inductance；It is inserted into air gap in magnetic core magnetic circuit, the magnetizing inductance needed for resonant cavity is obtained with this.Traditional scheme there are the shortcomings that
It is：The magnetic field of air gap periphery can generate edge efficiency to neighbouring winding or conductor, cause compared with lossy；Dual-slot structure leads to window
Mouth length halves, and window utilization rate declines, and the number of turns of every layer of winding is reduced and the number of plies of winding increases, therefore leads to kindred effect
Significantly, AC resistance loss increases.These disadvantages are more obvious in high-power applications, resonant parameter when leading to high-power applications
The integrated difficulty of magnetic, transformer conversion efficiency declines, and weakens the efficient advantage of LLC resonant converter.For this purpose, the present invention carries
A kind of high efficiency integrated form LLC resonance transformers are gone out, can not only keep resonant inductance and magnetizing inductance in traditional scheme all
The advantage being integrated in transformer, and disadvantages mentioned above existing for traditional scheme can be obviously improved；It not only can be suitably used for medium and small work(
Rate LLC resonant converter is also applied for high-power LLC resonant converter.
Invention content
It, can will be in LLC resonant converter the object of the present invention is to provide a kind of high efficiency integrated form LLC resonance transformers
Resonant inductance and magnetizing inductance be all integrated in transformer, while edge effect and kindred effect can be reduced, improve transformation
The efficiency of device is not only applicable to middle low power LLC resonant converter, is also applied for high-power LLC resonant converter.
To achieve the above object, the present invention provides following schemes：
A kind of high efficiency integrated form LLC resonance transformers, the transformer include：Magnetic core 1, skeleton 2, low permeability magnetosphere
3, low permeability magnetosphere 4, armature winding 5, secondary windings 6, air gap 7；The air gap 7 is located at the center pillar of magnetic core 1；The low magnetic conduction
Rate magnetosphere 3 is by the center pillar tight of magnetic core 1；The armature winding is wound on inner layer, and the number of plies is no more than 3 layers；The secondary windings
It is wound on outer layer, the number of plies is no more than 3 layers；Told low permeability magnetosphere 4 is between armature winding 5 and secondary windings 6.
The magnetic core 1 is ferrite, and the air gap 7 is located at ferrite center pillar, and side column is not inserted into air gap.
The low permeability magnetosphere 3 is using the material of low permeability, and relative permeability is generally 5~10, the low magnetic conduction
Rate magnetosphere 3 wraps up the center pillar uniform close of magnetic core 1, since the magnetic permeability of low permeability magnetosphere 3 is still big more than air,
The leakage magnetic flux at air gap edge largely passes through low permeability magnetosphere 3, can effectively reduce the side that air gap fringe magnetic leakage generates winding
Edge effect, while the magnetizing inductance needed for resonance can be obtained；
The selection of the magnetic core of transformer, the calculating process of gas length are as follows：
The excitation current I of primaryLmValue provided by formula (1)：
V in formulapriTo be added in the voltage value at primary both ends, fsFor the working frequency of converter；LmFor resonant cavity
Magnetizing inductance value；
Effective relative permeability μeffFor：
lcFor the length of magnetic path of magnetic core of transformer；AcIt is accumulated for magnetic core centre pillar cross-section；N1For the number of turns of armature winding；μ0For
The magnetic permeability of air；
By ApValue selects suitable magnetic core：
Here ∑ VA is the sum of the rated VA value of each winding of transformer, kuFor window utilization factor, KvFor form factor,
Sine wave Kv=4.44, fsFor working frequency, BoBest magnetic induction intensity value, Kt=48.2x103, kfFor magnetic core lamination coefficient.
Best magnetic induction density BoIt is provided by formula (4)：
Here, hcFor conductive heat transfer coefficient, representative value takes 10, ka, kc, kwFor dimensionless constant, general representative value takes ka
=40, kc=5.6, kw=10.KC, α is material parameter, ρwFor conductor resistance rate.
Gas length g calculation formula in transformer magnetic circuit are as follows：
The magnetic resistance figure of the high efficiency integrated form LLC resonance transformers is as shown in figure 3, Rm1For the magnetic of air gap edge magnetosphere
Resistance, RmgFor the magnetic resistance of air gap；Wherein：
In formula, μ1For the magnetic permeability of low permeability magnetosphere 3, Ac1For the cross-sectional area of low permeability magnetosphere 3；μ0For air
Magnetic permeability, AcIt is accumulated for the centre pillar cross-section of transformer fe ferrite core；Because of μ1＞ ＞ μ0, but Ac＞ ＞ Ac1, so Rm1With
RmgFor the same order of magnitude, so Rm1It will not be to RmgCause short circuit.
The armature winding is wound on inner layer, because not using dual-slot structure, length of window is twice of traditional scheme or more,
Therefore the winding number of plies can greatly reduce；Likewise, the secondary windings is wound on outer layer, the number of plies also greatly reduces；Foundation
Dowell formula：
P in formula is the number of plies of transformer winding, and Δ is winding thickness d and skin depth δ0Ratio, it is known that, winding layers
Number p is more, and AC resistance is bigger, and the present invention effectively reduces the winding number of plies, and kindred effect significantly reduces, therefore AC resistance is aobvious
It writes and reduces, be conducive to improve transformer efficiency.
The low permeability magnetosphere 4 is located at the centre of armature winding 5 and secondary windings 6, and relative permeability value is 30
~150, for increasing the leakage magnetic flux between armature winding and secondary windings；Such as Fig. 3,4 its equivalent magnetic of the low permeability magnetosphere
Resistance is RmL：
In formula, μ2For the relative permeability of low permeability magnetosphere 4, Ac2For the cross-sectional area of low permeability magnetosphere 4, lmIt is low
The length of magnetic path of magnetic permeability magnetosphere 4；The thickness for changing low permeability magnetosphere 4 is the cross-sectional area A for changing low permeability magnetosphere 4c2,
The size that leakage magnetic flux can thus be adjusted changes integrated resonant inductance parameter value.
The equivalent circuit of the high efficiency integrated form LLC resonance transformers is as shown in Figure 4.
In Fig. 4, L'rFor：
In formula, N2For secondary winding turns, I2For secondary winding current, I1For primary winding current, d is low permeability magnetic
The half at the thick bottom of layer 4, h are distance of the magnetic core center pillar center to low permeability magnetosphere 4；
Resonant inductance value needed for LLC resonant cavities is；
Lr=Lm||L'r (11)
In Fig. 4, inductance Lm is the magnetizing inductance of transformer；
According to specific embodiment provided by the invention, the invention discloses following technique effects：It is provided by the invention efficient
Rate integrated form LLC resonance transformers increase one layer of low permeability magnetosphere 3 between inner layer armature winding and magnetic core center pillar air gap,
The magnetic permeability of the magnetosphere is much smaller than FERRITE CORE, but bigger than the magnetic permeability of air, can effectively collect the leakage field at air gap edge
It is logical, weaken influence of the leakage magnetic flux to adjacent wires, greatly reduces edge loss.Moreover, first winding and secondary windings are no longer
By the way of dividing slot coiling, the length of magnetic path greatly increases, and effectively reduces the number of plies of primary and secondary winding to reduce exchange
Resistance reduces proximity loss.Magnetic to realize resonant inductance is integrated, and low permeability is added between armature winding and secondary windings
Magnetosphere 4, can control the thickness of magnetosphere 4 to adjust primary and secondary magnetic flux leakage, integrated to adjust transformer
The inductance value of resonant inductance.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure chart of high efficiency integrated form LLC resonance transformers of the embodiment of the present invention；
Fig. 2 is the sectional view of high efficiency integrated form LLC resonance transformers of the embodiment of the present invention；
Fig. 3 is the magnetic resistance figure of high efficiency integrated form LLC resonance transformers of the embodiment of the present invention；
Fig. 4 is the equivalent circuit diagram of high efficiency integrated form LLC resonance transformers of the embodiment of the present invention；
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It, can will be needed for LLC resonant transformations the object of the present invention is to provide a kind of high efficiency integrated form LLC resonance transformers
Resonant inductance and magnetizing inductance be all integrated in inside transformer, while the shortcomings that overcome traditional LLC resonance transformer, realizing nothing
By be can be realized under middle low power or high-power applications efficient energy transmit purpose.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
The present invention provides a kind of high efficiency integrated form LLC resonance transformers, as shown in Figure 1, the transformer includes：Magnetic
Core 1, skeleton 2, low permeability magnetosphere 3, low permeability magnetosphere 4, armature winding 5, secondary windings 6, air gap 7；
As shown in Figure 1, the air gap 7 is placed between the center pillar of magnetic core, the side column on both sides does not place air gap；Described is low
The relative permeability of magnetic permeability magnetosphere 3 is smaller, and value range is 5~10；As shown in Fig. 2, 3 tight magnetic of low permeability magnetosphere
The center pillar of air gap is placed in core.
As shown in Fig. 2, the armature winding 5 is wound on the inner layer of skeleton；As shown in Figure 1, armature winding is uniformly around full skeleton
Defined by the length of magnetic path, therefore the number of plies of armature winding is smaller, therefore the AC resistance of armature winding is smaller, effectively reduces adjacent
It is lost caused by nearly effect.
As shown in Fig. 2, the secondary windings 6 is wound on the outer layer of skeleton；As shown in Figure 1, secondary windings is uniformly around full skeleton
Defined by the length of magnetic path, therefore the number of plies of secondary windings is smaller, therefore the AC resistance of secondary windings is smaller, effectively reduces adjacent
It is lost caused by nearly effect.
As shown in Fig. 2, low permeability magnetosphere 4 is inserted between armature winding 5 and secondary windings 6, low permeability magnetosphere 4
Relative permeability value range is 30~150, provides a leakage field channel for primary and secondary winding, transformer is made to obtain
Resonant inductance needed for LLC resonance changes the thickness of low permeability magnetosphere 4, can adjust the integrated resonant inductance sense of transformer
The size of value.
High efficiency integrated form LLC resonance transformers provided by the invention have high integration and efficient feature, can
LLC resonant inductances and magnetizing inductance are all integrated in inside transformer, effectively improve the power density of LLC resonant converter；It answers
In, air-gap leakage flux edge effect caused by winding can also be effectively reduced；The magnetic circuit of primary and secondary is widened, around
The group number of plies is reduced, and effectively reduces the AC resistance of winding, the two advantages improve the efficiency of transformer, so that entirely
The efficiency of LLC resonant converter gets a promotion.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (5)
1. a kind of high efficiency integrated form LLC resonance transformers, which is characterized in that the air gap 7 is located at the center pillar of magnetic core 1；It is described
Low permeability magnetosphere 3 is by the center pillar tight of magnetic core 1；The armature winding is wound on inner layer；The secondary windings is wound on outer layer；
The low permeability magnetosphere 4 is between armature winding 5 and secondary windings 6.
2. transformer according to claim 1, which is characterized in that the low permeability magnetosphere 3 is uniform by the center pillar of magnetic core 1
The relative permeability value range of tight, low permeability magnetosphere 3 is 5 ~ 10.
3. transformer according to claim 1, which is characterized in that the armature winding is wound on inner layer, and the number of plies is no more than 3
Layer.
4. transformer according to claim 1, which is characterized in that the secondary windings is wound on outer layer, and the number of plies is no more than 3
Layer.
5. transformer according to claim 1, which is characterized in that the low permeability magnetosphere 4 be located at armature winding 5 and time
Between grade winding 6, the relative permeability value range of low permeability magnetosphere 4 is 30 ~ 150.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711136438.2A CN108666067B (en) | 2017-11-16 | 2017-11-16 | High efficiency integrated form LLC resonant transformer |
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| CN201711136438.2A CN108666067B (en) | 2017-11-16 | 2017-11-16 | High efficiency integrated form LLC resonant transformer |
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| CN108666067A true CN108666067A (en) | 2018-10-16 |
| CN108666067B CN108666067B (en) | 2020-11-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114823092A (en) * | 2022-04-25 | 2022-07-29 | 湖南工程学院 | Lightweight transformer, lightweight transformer design method and high-voltage power supply |
| CN115050569A (en) * | 2022-07-18 | 2022-09-13 | 华中科技大学 | Optimization method of low-loss magnetic integration planar transformer for LLC resonant converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10285693A (en) * | 1997-04-07 | 1998-10-23 | Sony Corp | Acoustic transducer |
| CN2617016Y (en) * | 2003-05-16 | 2004-05-19 | 司峰电子股份有限公司 | Transformer |
| CN101540227A (en) * | 2008-03-21 | 2009-09-23 | 旭丽电子(广州)有限公司 | Center tapped transformer |
| CN104409202A (en) * | 2014-12-15 | 2015-03-11 | 温州大学 | High-efficiency tightly-coupled LLC resonance transformer |
| CN106935384A (en) * | 2015-12-18 | 2017-07-07 | 沃尔泰拉半导体有限公司 | Coupling inductor array and correlation technique |
-
2017
- 2017-11-16 CN CN201711136438.2A patent/CN108666067B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10285693A (en) * | 1997-04-07 | 1998-10-23 | Sony Corp | Acoustic transducer |
| CN2617016Y (en) * | 2003-05-16 | 2004-05-19 | 司峰电子股份有限公司 | Transformer |
| CN101540227A (en) * | 2008-03-21 | 2009-09-23 | 旭丽电子(广州)有限公司 | Center tapped transformer |
| CN104409202A (en) * | 2014-12-15 | 2015-03-11 | 温州大学 | High-efficiency tightly-coupled LLC resonance transformer |
| CN106935384A (en) * | 2015-12-18 | 2017-07-07 | 沃尔泰拉半导体有限公司 | Coupling inductor array and correlation technique |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114823092A (en) * | 2022-04-25 | 2022-07-29 | 湖南工程学院 | Lightweight transformer, lightweight transformer design method and high-voltage power supply |
| CN114823092B (en) * | 2022-04-25 | 2024-03-12 | 湖南工程学院 | Lightweight transformer, lightweight transformer design method and high-voltage power supply |
| CN115050569A (en) * | 2022-07-18 | 2022-09-13 | 华中科技大学 | Optimization method of low-loss magnetic integration planar transformer for LLC resonant converter |
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| CN108666067B (en) | 2020-11-06 |
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