CN109698625A - Improve the implementation method of flyback power converter transformer output power density - Google Patents
Improve the implementation method of flyback power converter transformer output power density Download PDFInfo
- Publication number
- CN109698625A CN109698625A CN201811387424.2A CN201811387424A CN109698625A CN 109698625 A CN109698625 A CN 109698625A CN 201811387424 A CN201811387424 A CN 201811387424A CN 109698625 A CN109698625 A CN 109698625A
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- CN
- China
- Prior art keywords
- core
- iron core
- transformer
- permanent magnet
- output power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H01F27/24—Magnetic cores
Abstract
The present invention relates to a kind of implementation methods for improving flyback power converter transformer output power density, one section of permanent magnet is added in the core structure of transformer, and it is provided with air gap in the core, in the case where not increasing iron core magnetic resistance, the flux density quiescent point of iron core is pulled low to third quadrant, the permanent magnet is used to carry out flux density in iron core Contrary compensation, and and the magnetic field that is generated in iron core of winding realize partial offset.The invention enables converters to improve output power density while volume reduces.
Description
Technical field
The present invention relates to flyback power converter technical fields, more particularly to a kind of raising flyback power converter
The implementation method of transformer output power density.
Background technique
Flyback power converter has circuit topology and control compared to the DC/DC converter using other circuit topologies
System strategy is simple, electromagnetic interference is low and the irreplaceable advantage such as economy.At present the application of middle low power almost without
One exceptionally uses flyback power converter, most of closely related with people's lives, such as mobile phone charging
Device, power supply adapter for notebook computer etc..
The work of flyback converter is divided into two stages, closes the switch and switch the disconnected phase.As shown in Figure 1, opening
Close stage is closed, the primary coil of transformer is connected directly between on input voltage.Electric current and magnetic core of transformer in primary coil
In magnetic field increase, energy is stored in magnetic core.The voltage generated in secondary coil is reversed, so that diode is in anti-
Inclined state and cannot be connected.At this point, providing voltage and current from capacitor to load.In the switch disconnected phase, in primary coil
Electric current is 0.The magnetic field in magnetic core is begun to decline simultaneously, induces forward voltage on the secondary winding.Diode is in just at this time
The electric current of inclined state, conducting flows into capacitor and load.The energy transfer stored in magnetic core is into capacitor and load.Due to inverse-excitation type
Converter has the function of being dielectrically separated from, and is dielectrically separated from function so similarly needing on the control circuitry.Most common two
Kind control model is Voltage Feedback control and Current Feedback Control.Both control models are required signal from secondary coil one
Side is transmitted to primary coil side, generallys use photoelectrical coupler or increases the side of an independent coiling on magnetic core of transformer
Method realizes isolation signals transmitting.
Traditional flyback power converter easily leads to iron core since at work, transformer has biggish DC component
Saturation, so air gap must be added in magnetic circuit and use the biggish iron core of volume, so that volume of transformer be caused to become larger.This
One of the reason of being also limitation flyback power converter development always.Expand flyback power converter transformer iron core flux density
Range of operation drags down iron core flux density operating point, is the effective measures for improving transformer fe core material anti-saturation ability.But
Transformer core flux density range of operation can be expanded and reduce the method for volume of transformer and do not proposed so far, inverse-excitation type function
Rate converter output power is difficult to improve.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of raising flyback power converter transformer output powers
The implementation method of density, so that converter improves output power density while volume reduces.
The technical solution adopted by the present invention to solve the technical problems is: providing a kind of raising flyback power converter change
One section of permanent magnet is added in the core structure of transformer, and is provided in the core for the implementation method of depressor output power density
The flux density quiescent point of iron core is pulled low to third quadrant, the permanent magnet in the case where not increasing iron core magnetic resistance by air gap
For carrying out Contrary compensation to flux density in iron core, and and the magnetic field that is generated in iron core of winding realize partial offset.
In EE type transformer, the core section along transformer is cut open, and one section of permanent magnet is added, and the permanent magnet magnetizes
Direction is along the y axis that there are air gaps between the permanent magnet and iron core.
In EE type transformer, the core section along transformer is embedded in one section of magnet ring, the magnet ring side of magnetizing
To for along the y axis, and ferromagnetic sleeve is loaded onto two bottom surfaces of magnet ring, the magnetic line of force of magnet ring is introduced into core interior,
And air gap is provided in the iron core that is surrounded of the magnet ring.
Beneficial effect
Due to the adoption of the above technical solution, compared with prior art, the present invention having the following advantages that and actively imitating
Fruit: the present invention expands the range of operation of inverse excitation type converter transformer core flux density, and core material utilization rate greatly promotes, and becomes
The enhancing of depressor core material anti-saturation ability, reduces the volume of transformer, improves transformer output power density.
Detailed description of the invention
Fig. 1 is flyback power converter circuit schematic diagram；
Fig. 2 is a kind of EE type flyback power transformer configuration schematic diagram；
Fig. 3 is another EE type flyback power transformer configuration schematic diagram；
Fig. 4 is transformer core operating point schematic diagram.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiments of the present invention are related to a kind of realization for improving flyback power converter transformer output power density
One section of permanent magnet is added in the core structure of transformer, and is provided with air gap in the core for method, is not increasing iron core magnetic resistance
In the case of, the flux density quiescent point of iron core is pulled low to third quadrant, the permanent magnet is used to carry out flux density in iron core anti-
To compensation, and and the magnetic field that is generated in iron core of winding realize partial offset.It is existing using the converter comparison after this method
Flyback power converter, when being passed through same current, iron core flux density operating point is farther away from zone of saturation, the operation of iron core flux density
Range expands, the enhancing of the anti-saturation ability of iron core, core material utilization rate greatly promotes, volume of transformer reduces to which raising is anti-
Swash formula power inverter output power density.
As shown in Fig. 2, the core section along transformer is cut open in EE type transformer, one section of permanent magnet is added, it is described
Permanent magnet magnetizing direction is along the y axis that there are air gaps between the permanent magnet and iron core.As shown in figure 3, in EE type transformer
In, it is embedded in one section of magnet ring along the core section of transformer, the magnet ring magnetizing direction is along the y axis, and forever
Ferromagnetic sleeve is loaded onto two bottom surfaces of magnet ring, the magnetic line of force of magnet ring is introduced core interior, and the magnet ring is surrounded
Air gap is provided in iron core.The permanent magnet of both modes can generate the magnetic field opposite with coil magnetic field, realize permanent magnet and line
It encloses and generates the effect cancelled out each other of magnetic field in core interior, by the third quadrant of the initial static flux density operating point reduction of iron core,
Initial work location rises to the increase of zone of saturation spatial dimension at this time, that is, expands the range of operation of transformer core flux density.?
Under same case, flyback power converter volume reduces, and output power density improves.
It is assumed that the operating point of transformer core is near a point when transformer coil passes to the electric current of 20A
Fluctuation.To guarantee iron core work in linear region, iron core flux density working range is limited between origin and a point.It more than a point works
Region be it is non-linear, so iron core will be saturated when electric current is further added by winding.And when embedding in transformer fe core inner
When entering permanent magnet, if the flux density operating point of iron core is reduced to the b point of third quadrant when coil obstructed electric current.Work as transformation in this way
When device coil passes to the 20A electric current of same size, the operating point of coil, which will change to a ', puts fluctuation nearby, electric in winding at this time
Stream iron core when increasing can't be saturated.Transformer flux density job enlargement is b point to a point.
It is not saturated if it is desired to which coil is passed through 25A current ferric core, it usually needs increase the size of iron core or air gap, iron core
The increase of own vol can directly result in volume of transformer increase, be unfavorable for the raising of output power density；And increase air gap
Size then will lead to the increase of magnetic resistance in entire magnetic circuit, and to obtain a certain amount of inductance, umber of turn also needs to increase, and volume increases
It is unfavorable for the miniaturization of product.Method under same case by the way that permanent magnet is added, saturation neither occurs for iron core and volume is opposite
Reduce, flyback power converter transformer output density improves.
It can be seen that method of the invention hardly increases the magnetic resistance in magnetic circuit, if needing in power inverter using larger
Inductance, then without considering the problems of that core dimensions or umber of turn need to be increased because of magnetic resistance increase.Present invention decreases transformers
Volume improves the utilization rate of core material, is conducive to the miniaturization of product, and it is defeated to improve flyback power converter transformer
Power density out.
Claims (3)
1. a kind of implementation method for improving flyback power converter transformer output power density, which is characterized in that in transformation
One section of permanent magnet is added in the core structure of device, and is provided with air gap in the core, in the case where not increasing iron core magnetic resistance, by iron
The flux density quiescent point of core is pulled low to third quadrant, and the permanent magnet is used for flux density progress Contrary compensation in iron core, and with
Realize partial offset in the magnetic field that winding generates in iron core.
2. the implementation method according to claim 1 for improving flyback power converter transformer output power density,
It is characterized in that, in EE type transformer, the core section along transformer is cut open, and one section of permanent magnet is added, and the permanent magnet fills
Magnetic direction is along the y axis that there are air gaps between the permanent magnet and iron core.
3. the implementation method according to claim 1 for improving flyback power converter transformer output power density,
It is characterized in that, in EE type transformer, the core section along transformer is embedded in one section of magnet ring, the magnet ring side of magnetizing
To for along the y axis, and ferromagnetic sleeve is loaded onto two bottom surfaces of magnet ring, the magnetic line of force of magnet ring is introduced into core interior,
And air gap is provided in the iron core that is surrounded of the magnet ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387424.2A CN109698625A (en) | 2018-11-21 | 2018-11-21 | Improve the implementation method of flyback power converter transformer output power density |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811387424.2A CN109698625A (en) | 2018-11-21 | 2018-11-21 | Improve the implementation method of flyback power converter transformer output power density |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109698625A true CN109698625A (en) | 2019-04-30 |
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| CN201811387424.2A Pending CN109698625A (en) | 2018-11-21 | 2018-11-21 | Improve the implementation method of flyback power converter transformer output power density |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006114662A (en) * | 2004-10-14 | 2006-04-27 | Sumitomo Electric Ind Ltd | Reactor and step-up/down converter |
| CN101252038A (en) * | 2007-12-19 | 2008-08-27 | 四川长虹电器股份有限公司 | Single end driver transformer |
| CN102945733A (en) * | 2012-11-27 | 2013-02-27 | 中国船舶重工集团公司第七一二研究所 | Anti-saturation magnet ring |
| CN103366922A (en) * | 2012-03-30 | 2013-10-23 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Magnetic element with pre-biased magnet and manufacture method |
| CN103545090A (en) * | 2012-07-12 | 2014-01-29 | 无锡晶磊电子有限公司 | Direct current reactor for large-scale frequency conversion controller |
| CN104505239A (en) * | 2015-01-14 | 2015-04-08 | 东南大学 | Mixed magnetic biasing magnetic saturation controllable electric reactor |
| CN105469932A (en) * | 2016-01-19 | 2016-04-06 | 张月妹 | Direct current inductor |
| CN106057395A (en) * | 2016-08-16 | 2016-10-26 | 福州大学 | Permanent magnet biased magnetic element assembly and method for implementing same |
-
2018
- 2018-11-21 CN CN201811387424.2A patent/CN109698625A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006114662A (en) * | 2004-10-14 | 2006-04-27 | Sumitomo Electric Ind Ltd | Reactor and step-up/down converter |
| CN101252038A (en) * | 2007-12-19 | 2008-08-27 | 四川长虹电器股份有限公司 | Single end driver transformer |
| CN103366922A (en) * | 2012-03-30 | 2013-10-23 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Magnetic element with pre-biased magnet and manufacture method |
| CN103545090A (en) * | 2012-07-12 | 2014-01-29 | 无锡晶磊电子有限公司 | Direct current reactor for large-scale frequency conversion controller |
| CN102945733A (en) * | 2012-11-27 | 2013-02-27 | 中国船舶重工集团公司第七一二研究所 | Anti-saturation magnet ring |
| CN104505239A (en) * | 2015-01-14 | 2015-04-08 | 东南大学 | Mixed magnetic biasing magnetic saturation controllable electric reactor |
| CN105469932A (en) * | 2016-01-19 | 2016-04-06 | 张月妹 | Direct current inductor |
| CN106057395A (en) * | 2016-08-16 | 2016-10-26 | 福州大学 | Permanent magnet biased magnetic element assembly and method for implementing same |
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Application publication date: 20190430 |
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