CN104025217B - Magnetic core, integrated magnetic element, active clamp forward-flyback circuit and switch power supply - Google Patents

Magnetic core, integrated magnetic element, active clamp forward-flyback circuit and switch power supply Download PDF

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Publication number
CN104025217B
CN104025217B CN201480000048.0A CN201480000048A CN104025217B CN 104025217 B CN104025217 B CN 104025217B CN 201480000048 A CN201480000048 A CN 201480000048A CN 104025217 B CN104025217 B CN 104025217B
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Prior art keywords
magnetic
magnetic core
magnetic pole
winding
core
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CN201480000048.0A
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CN104025217A (en
Inventor
赵德琦
刘鹏飞
陈丽君
莫光铖
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Shenzhen Shinry Technologies Co Ltd
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Shenzhen Shinry Technologies Co Ltd
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Priority to PCT/CN2014/072933 priority Critical patent/WO2015131359A1/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
    • H01F27/255Magnetic cores made from particles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00Cores, Yokes, or armatures
    • H01F3/08Cores, Yokes, or armatures made from powder
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00Cores, Yokes, or armatures
    • H01F3/10Composite arrangements of magnetic circuits
    • H01F3/14Constrictions; Gaps, e.g. air-gaps
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/337Conversion 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 in push-pull configuration

Abstract

The embodiment of the present invention discloses a magnetic core, an integrated magnetic element comprising the above-described magnetic core, an active clamp forward-flyback circuit comprising the above-described integrated magnetic element, and a switch power supply. The magnetic core comprises a first magnetic pole, a second magnetic pole, a third magnetic pole and a cross column. The cross column is connected to the same ends of the first magnetic pole, the second magnetic pole and the third magnetic pole. The second magnetic pole is located between the third magnetic pole and the first magnetic pole. The cross section of the first magnetic pole is not equal to the cross section of the third magnetic pole in area along the direction perpendicular to magnetic induction lines. According to the structure of the integrated magnetic element with the above magnetic core, two sets of transformers are formed by a coil wound onto the magnetic core. The active clamp forward-flyback circuit comprises the above-described integrated magnetic element. In this way, the cross-sectional area of the magnetic poles of a forward transformer is smaller than the cross-sectional area of the magnetic poles of a flyback transformer. Therefore, the normal operation of the active clamp forward-flyback circuit is ensured, while the size and the weight of the circuit are reduced.

Description

A kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply
Technical field
The present invention relates to electronic applications, more particularly to a kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and open Powered-down source.
Background technology
Power Electronic Technique develops rapidly, and especially microprocessor is developed rapidly to carrying for its power module powered Great challenge is gone out.People have found magnetic while modular power source performance is improved using multiple technologies means, increasingly Element (abbreviation magnetic cell, including magnetic core and the coil that is wound on magnetic core) be limit power volume, weight, one of efficiency it is important Factor.According to American Power manufacture NAB National Association 0f Broadcasters (PSMA) statistics, magnetic cell volume is in DC-DC(DC/DC)Account in module Cumulative volume more than 20%, weight account for more than the 30% of gross weight.
Active clamp positive and negative excitation circuit is a kind of at present conventional power circuit, with circuit topology is simple, due to voltage spikes It is little, the good characteristics such as ZVT can be realized, be widely used in the DC converting occasion of middle low power.It is existing Two common transformers are integrated in a magnetic cell by the magnetic integrated circuit that active clamp positive and negative excitation circuit is adopted in technology On, circuit structure is simplified to a certain extent, reduce the volume of magnetic cell.But the circuit will simply realize forward converter Simply it is made on one block of magnetic cell with two transformers of circuit of reversed excitation, the volume and weight of magnetic cell is still than larger, magnetic The utilization rate of core is not high, and the volume and weight of magnetic cell also has the space for further reducing.
The content of the invention
The embodiment of the invention discloses a kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply, can To realize reducing the volume of magnetic core and integrated magnetic component, increase integrated magnetic unit in active clamp positive and negative excitation circuit and Switching Power Supply The technique effect of the utilization rate of part magnetic core.
Embodiment of the present invention first aspect discloses a kind of magnetic core, specifically includes:
First magnetic pole, the second magnetic pole, the 3rd magnetic pole and spreader, the spreader connect first magnetic pole, described second Same one end of magnetic pole and the 3rd magnetic pole, second magnetic pole is located between first magnetic pole and the 3rd magnetic pole, institute The cross-sectional area that the first magnetic pole is stated perpendicular to magnetic induction line is unequal perpendicular to the cross-sectional area of magnetic induction line with the 3rd magnetic pole.
Embodiment of the present invention second aspect discloses a kind of integrated magnetic component, specifically includes:
The closed magnetic core being made up of the first magnetic core and the second magnetic core, and the coil being wound in the closed magnetic core;Its It is characterised by:
First magnetic core and second magnetic core are the magnetic core as disclosed in embodiment of the present invention first aspect, described first Magnetic core is consistent with second magnetic core size;Wherein,
Second magnetic pole of first magnetic core is relative two-by-two with the second magnetic pole of second magnetic core and contacts, and constitutes described The center pillar of closed magnetic core;
First magnetic pole of first magnetic core is relative two-by-two with the first magnetic pole of second magnetic core not to be contacted, and is constituted described First lateral column of closed magnetic core;First is formed between first magnetic pole of the first magnetic pole of first magnetic core and second magnetic core Air gap;
3rd magnetic pole of first magnetic core is relative two-by-two with the 3rd magnetic pole of second magnetic core not to be contacted, and is constituted described Second lateral column of closed magnetic core;Second is formed between 3rd magnetic pole of first magnetic core and the 3rd magnetic pole of second magnetic core Air gap;
The coil is wound in the closed magnetic core, forms two groups of transformers.
The embodiment of the present invention third aspect discloses a kind of active clamp positive and negative excitation circuit, specifically includes:
Primary circuit, integrated magnetic component, secondary rectification and capacitor filter, the secondary rectification and capacitor filtering electricity Road includes rectification circuit and filter circuit;It is characterized in that:The primary circuit connects the pair by the integrated magnetic component Side rectification and capacitor filter, the primary circuit connects first primary side winding and second primary side winding, described First vice-side winding and second vice-side winding connect the rectification circuit, and the rectification circuit connects the filter circuit, Wherein described integrated magnetic component is integrated magnetic component disclosed in embodiment of the present invention second aspect.
Embodiment of the present invention fourth aspect discloses a kind of Switching Power Supply, including disclosed in the embodiment of the present invention third aspect Active clamp positive and negative excitation circuit.
The embodiment of the present invention is set to the cross-sectional area of the first magnetic pole of magnetic core and the 3rd magnetic pole unequal;In integrated magnetic Adopt above-mentioned magnetic core in element, and the distance between the first magnetic pole by the first magnetic pole of the first magnetic core and the second magnetic core namely The distance between 3rd magnetic pole of the width of the first air gap and the first magnetic core and the 3rd magnetic pole of the second magnetic core namely interstice Width ratio, the ratio with the cross-sectional area of the 3rd magnetic pole with the first magnetic pole of magnetic core is set to, not affect magnetic loop Normal pass;In active clamp positive and negative excitation circuit, what the first magnetic pole participated in being formed is normal shock transformer, and the 3rd magnetic pole participates in shape Into be flyback transformer, the first magnetic pole of magnetic core and the cross-sectional area of the 3rd magnetic pole are set to unequal, realizing Forward- flyback While circuit normal function, the volume and weight of magnetic core is reduced, and then reduce active positive and negative excitation circuit and Switching Power Supply Volume and weight, improve the utilization rate of magnetic core in circuit.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of front view of magnetic core of the embodiment of the present invention;
Fig. 2 is a kind of upward view of magnetic core of the embodiment of the present invention;
Fig. 3 is the structural representation of the first integrated magnetic component of the embodiment of the present invention;
Fig. 4 is the structural representation of second integrated magnetic component of the embodiment of the present invention;
Fig. 5 is a kind of structural representation of active clamp positive and negative excitation circuit of the embodiment of the present invention;
Fig. 6 is a kind of circuit diagram of active clamp positive and negative excitation circuit of the embodiment of the present invention;
Fig. 7 is a kind of structural representation of Switching Power Supply of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made Embodiment, belongs to the scope of protection of the invention.
Magnetic core, the integrated magnetic component comprising above-mentioned magnetic core disclosed in the embodiment of the present invention, comprising above-mentioned integrated magnetic component First magnetic pole of active clamp positive and negative excitation circuit, wherein magnetic core and the cross-sectional area of the 3rd magnetic pole are unequal;Comprising above-mentioned magnetic core Integrated magnetic component in, be wound on magnetic core coil formed two groups of transformers;Active clamp comprising above-mentioned integrated magnetic component is just In circuit of reversed excitation, the magnetic pole cross-sectional area of normal shock transformer is less than the magnetic pole cross-sectional area of flyback transformer, it is ensured that Forward- flyback While normal circuit operation, circuit volume and weight is reduced.
Fig. 1 is referred to, Fig. 1 is a kind of front view of magnetic core of the embodiment of the present invention.Magnetic core shown in Fig. 1 can be applied In the coil and transformer of various electronic equipments.As shown in figure 1, the magnetic core 10 includes:First magnetic pole 11, the second magnetic pole 12, Three magnetic poles 13 and spreader 14, spreader 14 connects same one end of the first magnetic pole 11, the second magnetic pole 12 and the 3rd magnetic pole 13, the second magnetic Post 12 is located between the first magnetic pole 11 and the 3rd magnetic pole 13.
Fig. 2 is referred to, Fig. 2 is a kind of upward view of magnetic core of the embodiment of the present invention.As shown in Fig. 2 the first magnetic pole 11 Cross-sectional area S1 is unequal with the cross-sectional area S3 of the 3rd magnetic pole 13.Wherein, cross-sectional area refers to the magnetic pole perpendicular to magnetic induction line Area.
Further, the first magnetic pole is the 3rd magnetic pole perpendicular to the cross section of magnetic induction line perpendicular to the cross-sectional area of magnetic induction line Long-pending 0.3-0.8 times.
Magnetic core shown in Fig. 1 and Fig. 2 is made up of the iron core of PQ type structures, further, it is also possible to be by E types, EC types, EP types Constitute etc. the iron core of shape, the present invention is not restricted to the structure of iron core.
Fig. 3 is referred to, Fig. 3 is the structural representation of the first integrated magnetic component of the embodiment of the present invention, the collection shown in Fig. 3 Can be used to being responsible in Switching Power Supply, power electronic equipment the transmission of magnetic energy, storage into magnetic cell and filter and electrically every From effect.As shown in figure 3, the integrated magnetic component 300 includes:The closed magnetic that first magnetic core 310 and the second magnetic core 320 are constituted Core, and the coil being wound in closed magnetic core, wherein the first magnetic core 310 and the second magnetic core 320 are the magnetic shown in Fig. 1 and Fig. 2 Core.
Specifically, the second magnetic pole 312 of the first magnetic core 310 and the second magnetic pole 322 of the second magnetic core 320 are relative two-by-two and connect Touch, constitute the center pillar of closed magnetic core 330;
First magnetic pole 311 of the first magnetic core 310 is relative two-by-two with the first magnetic pole 321 of the second magnetic core 320 not to be contacted, and is constituted First lateral column of closed magnetic core;Formed between first magnetic pole 311 of the first magnetic core 310 and the first magnetic pole 321 of the second magnetic core 320 First air gap;
3rd magnetic pole 313 of the first magnetic core 310 is relative two-by-two with the 3rd magnetic pole 323 of the second magnetic core 320 not to be contacted, and is constituted Second lateral column of closed magnetic core;Formed between 3rd magnetic pole 313 of the first magnetic core 310 and the 3rd magnetic pole 323 of the second magnetic core 320 Interstice;
The coil being wound on center pillar forms common primary side winding, and the coil being wound on the first lateral column forms the first secondary Winding Ns301, the coil being wound on the second lateral column forms the second vice-side winding Ns302, and common primary side winding is former as first Side winding Np301 and the first vice-side winding Ns301 constitutes the first transformer, while common primary side winding is used as the second primary side winding Np302 and the second vice-side winding Ns302 constitutes the second transformer.
Further, the distance between first magnetic pole 321 of the first magnetic pole 311 of the first magnetic core 310 and the second magnetic core 320 Form the width of the first air gap;Between 3rd magnetic pole 313 of the first magnetic core 310 and the 3rd magnetic pole 323 of the second magnetic core 320 away from From the width for forming interstice;The width of the first air gap is not equal to the width of interstice.
Further, the first magnetic pole of the ratio of the width of the width of the first air gap and interstice and the first magnetic core 310 311 cross-sectional area is in equal proportions with the cross-sectional area of the 3rd magnetic pole 313 of the first magnetic core 310.
Refer to Fig. 4, Fig. 4 is the structural representation of second integrated magnetic component of the embodiment of the present invention, the collection shown in Fig. 4 Into magnetic cell as the integrated magnetic component structure shown in Fig. 3, difference is that the winding method of coil is different, as shown in Figure 4:
It is wound on coil in the first magnetic pole 411 of the first magnetic core 410 and forms the first primary side winding Np401, is wound on the Coil in first magnetic pole 421 of two magnetic cores 420 forms the first vice-side winding Ns301, the first primary side winding Np401 and first secondary Side winding Ns401 constitutes the first transformer;The coil being wound in the 3rd magnetic pole 413 of the first magnetic core 410 forms the second former limit Winding Np402, the coil being wound in the 3rd magnetic pole 423 of the second magnetic core 420 forms the second vice-side winding Ns402, and second is former Side winding Np402 and the second vice-side winding Ns402 constitutes the second transformer;First primary side winding Np401 and the second primary side winding Np402 is connected in series.
Further, the distance between first magnetic pole 421 of the first magnetic pole 411 of the first magnetic core 410 and the second magnetic core 420 Form the width of the first air gap;Between 3rd magnetic pole 413 of the first magnetic core 410 and the 3rd magnetic pole 423 of the second magnetic core 420 away from From the width for forming interstice;The width of the first air gap is not equal to the width of interstice.
Further, the first magnetic pole of the ratio of the width of the width of the first air gap and interstice and the first magnetic core 410 411 cross-sectional area is in equal proportions with the cross-sectional area of the 3rd magnetic pole 413 of the first magnetic core 410.
The mode of simply two kinds of coil windings of integrated magnetic component illustrated above, but mode of the present invention to coil winding It is not restricted, coil is wound in closed magnetic core, forms two groups of transformers.
Fig. 5 is referred to, Fig. 5 is a kind of structural representation of active clamp positive and negative excitation circuit of the embodiment of the present invention;Fig. 5 institutes The active clamp positive and negative excitation circuit for showing is widely used in transformer, Switching Power Supply, power electronic equipment.As shown in figure 5, should Active clamp positive and negative excitation circuit 500 includes:Primary circuit 501, integrated magnetic component 504, secondary rectification and capacitor filter, it is secondary Side rectification and capacitor filter include rectification circuit 502 and filter circuit 503;It is characterized in that:Primary circuit 501 passes through Integrated magnetic component 504 connects secondary rectification and capacitor filter, connects the connection integrated magnetic component of primary circuit 501 of input The first primary side winding Np501 and integrated magnetic component the second primary side winding Np502, the first vice-side winding of integrated magnetic component The second vice-side winding Ns502 connection rectification circuits 502 of Ns501 and integrated magnetic component, the connection filter circuit of rectification circuit 502 503;Wherein integrated magnetic component is the integrated magnetic component as shown in the arbitrary figures of Fig. 3-4.
Specifically, the first transformer that the first primary side winding Np501 and the first vice-side winding Ns501 are constituted is normal shock transformation The second transformer that device, the second primary side winding Np502 and the second vice-side winding Ns502 are constituted is flyback transformer.
Normal shock transformer is the transformer that positive activation type circuit is formed in active clamp positive and negative excitation circuit, and Main Function is energy Transmission, transformer itself need not simultaneously store energy, and preferable normal shock transformer energy transfer ratio is 1:1, transformer itself Loss very little, so less transformer can just realize larger through-put power;Flyback transformer is that active clamp positive and negative swashs The transformer of reverse excitation circuit is formed in circuit, Main Function is in the magnetic core for store energy in transformer, then again from magnetic Secondary circuit is transferred the energy in core, needs larger transformer to realize the transmission of energy.By above normal shock transformer and instead The operation principle of violent change depressor understands that the size of the transformer required for forward converter and circuit of reversed excitation is different.
In the embodiment of the present invention, normal shock transformer by the closed magnetic core for being wound on integrated magnetic component 504 the first lateral column and First primary side winding Np501 of center pillar and the first vice-side winding Ns501 are constituted, and flyback transformer is by being wound on integrated magnetic component Second lateral column of 504 closed magnetic core and the second primary side winding Np502 of center pillar and the second vice-side winding Ns502 compositions;Therefore, The volume size of normal shock transformer is relevant with the volume size of the first lateral column of the closed magnetic core of integrated magnetic component 504, and flyback becomes The volume size of depressor is relevant with the volume size of the second lateral column of the closed magnetic core of integrated magnetic component 504.And the first lateral column is It is made up of the first magnetic pole of the first magnetic core and the first magnetic pole of the second magnetic core, the second lateral column is by the 3rd magnetic pole of the first magnetic core Constitute with the 3rd magnetic pole of the second magnetic core, therefore, the of the volume size of normal shock transformer and the first magnetic core and the second magnetic core The volume of one magnetic pole is relevant, and volume size and the volume of the first magnetic core and the 3rd magnetic pole of the second magnetic core of flyback transformer have Close, the first magnetic core and the second magnetic core size are in the same size.
In the embodiment of the present invention, cross-sectional area and the integrated magnetic component of the first magnetic pole of the first magnetic core of integrated magnetic component The cross-sectional area of the 3rd magnetic pole of the first magnetic core is set to different size, so that the body of the volume of the first magnetic pole and the 3rd magnetic pole Product is different.
Further, in the embodiment of the present invention, cross-sectional area and the collection of the first magnetic pole of the first magnetic core of integrated magnetic component Ratio into the cross-sectional area of the 3rd magnetic pole of the first magnetic core of magnetic cell is set to 0.3-0.8, so that the volume of normal shock transformer Less than the volume of flyback transformer, while and not affecting the normal work of forward converter and circuit of reversed excitation.
Flyback transformer is worked in circuit in the form of an energy-storage travelling wave tube, therefore the magnetic core of flyback transformer is general Need to arrange a certain size air gap, to prevent magnetic core of transformer saturation, meanwhile, to avoid the skew of magnetic flux, in positive violent change It is also required to arrange a certain size air gap in depressor, so that the magnetic resistance of magnetic loop is returned with magnetic in flyback transformer in normal shock transformer The magnetic resistance on road is equal in magnitude.The size of magnetic resistance is directly proportional to the size of the cross-sectional area of transformer magnetic pole, with the width of air gap into Inverse ratio.
In the embodiment of the present invention, between the first magnetic pole of the first magnetic core and the first magnetic pole of the second magnetic core the first air gap is formed I.e. the air gap of normal shock transformer, forms interstice i.e. anti-between the 3rd magnetic pole and the 3rd magnetic pole of the second magnetic core of the first magnetic core The air gap of violent change depressor;The distance between first magnetic pole of the first magnetic core and the first magnetic pole of the second magnetic core form the first air gap The distance between width, the 3rd magnetic pole of the first magnetic core and the 3rd magnetic pole of the second magnetic core form the width of interstice;First The ratio setting of the width of air gap and the width of interstice is the cross section of the cross-sectional area with the first magnetic pole and the 3rd magnetic pole Long-pending is in equal proportions.
Used as a kind of preferably mode, the cross-sectional area of the first magnetic pole of the first magnetic core is the 3rd magnetic pole of the first magnetic core The ratio of 0.5 times of cross-sectional area, the width of the first air gap and the width of interstice is also 0.5.
As a kind of preferred mode, first magnetic core and the second magnetic core of integrated magnetic component 504 by PQ type structures iron core Constitute.
Fig. 6 is referred to, Fig. 6 is a kind of circuit diagram of active clamp positive and negative excitation circuit of the embodiment of the present invention;Shown in Fig. 6 Circuit diagram is a specific embodiment of the structural representation shown in Fig. 5.As shown in fig. 6, the active clamp positive and negative excitation circuit bag Include:
The primary circuit being made up of input and metal-oxide-semiconductor Q6011, Q6012 and diode D6011;
The secondary side rectification circuit being made up of commutation diode D6021, D6022;
The capacitor filter being made up of filtered diode D6031;
Primary circuit connects secondary side rectification circuit and capacitor filter, former limit by integrated magnetic component as shown in Figure 3 Circuit connects the first primary side winding of integrated magnetic component and the second primary side winding of integrated magnetic component, now first primary side winding All it is common primary side winding in Fig. 3 with second primary side winding;First vice-side winding of integrated magnetic component and integrated magnetic component Second vice-side winding connects secondary side rectification circuit, and secondary side rectification circuit connection capacitor filter, capacitor filter connection is defeated Go out end.
In addition to constituting circuit using the connected mode between the components and parts and components and parts shown in Fig. 6, active clamp is just Circuit of reversed excitation can also be restricted using other circuit structures in prior art, the present invention.
Specifically, the first transformer that common primary side winding and the first vice-side winding are constituted is normal shock transformer, common former The second transformer that side winding and the second vice-side winding are constituted is flyback transformer.
In the embodiment of the present invention, cross-sectional area and the collection of the first magnetic pole 60411 of the first magnetic core 6041 of integrated magnetic component Ratio into the cross-sectional area of the 3rd magnetic pole 60413 of the first magnetic core 6041 of magnetic cell 604 is set to 0.3-0.8, so that normal shock The volume of transformer less than flyback transformer volume, while and not affecting the normal work of forward converter and circuit of reversed excitation.
In the embodiment of the present invention, the first magnetic pole 60411 of the first magnetic core 6041 and the first magnetic pole of the second magnetic core 6042 The distance between 60421 width for forming the first air gaps, the 3rd magnetic pole 60413 of the first magnetic core 6041 and the second magnetic core 6042 The distance between 3rd magnetic pole 60423 forms the width of interstice;The ratio of the width of the first air gap and the width of interstice Example is set to being in equal proportions for the cross-sectional area of the cross-sectional area with the first magnetic pole 60411 and the 3rd magnetic pole.
Used as a kind of preferably mode, the cross-sectional area of the first magnetic pole of the first magnetic core is the 3rd magnetic pole of the first magnetic core The ratio of 0.5 times of cross-sectional area, the width of the first air gap and the width of interstice is also 0.5.
As a kind of preferred mode, first magnetic core and the second magnetic core of integrated magnetic component by PQ type structures iron core structure Into.
Refer to Fig. 7, Fig. 7 is a kind of structural representation of Switching Power Supply of the embodiment of the present invention, switch as shown in Figure 7 Power supply 700 includes the active clamp positive and negative excitation circuit 701 and other circuits 702 as shown in Fig. 5 or 6.
Circuit in the embodiment of the present invention can according to actual needs be merged, divides and deleted.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party Formula is changed and changed.The invention is not limited in specific embodiment disclosed and described above, to invention some repair Change and change in the scope of the claims that should also be as falling into the present invention.Although some are specific used in this specification Term, but these terms are merely for convenience of description, do not constitute any restriction to the present invention.

Claims (10)

1. a kind of integrated magnetic component, including the closed magnetic core being made up of the first magnetic core and the second magnetic core, and is wound on described closing Close the coil on magnetic core;It is characterized in that:
First magnetic core is consistent with second magnetic core size;Wherein,
Second magnetic pole of first magnetic core is relative two-by-two with the second magnetic pole of second magnetic core and contacts, and constitutes the closure The center pillar of magnetic core;
First magnetic pole of first magnetic core is relative two-by-two with the first magnetic pole of second magnetic core not to be contacted, and constitutes the closure First lateral column of magnetic core;The first gas is formed between first magnetic pole of the first magnetic pole of first magnetic core and second magnetic core Gap;
3rd magnetic pole of first magnetic core is relative two-by-two with the 3rd magnetic pole of second magnetic core not to be contacted, and constitutes the closure Second lateral column of magnetic core;The second gas is formed between 3rd magnetic pole of first magnetic core and the 3rd magnetic pole of second magnetic core Gap;
The coil is wound in the closed magnetic core, forms two groups of transformers;
The distance between first magnetic pole of first magnetic core and first magnetic pole of second magnetic core form first air gap Width;The distance between 3rd magnetic pole of first magnetic core and the 3rd magnetic pole of second magnetic core form second gas The width of gap;The width of first air gap is not equal to the width of the interstice, the width of first air gap with it is described The ratio of the width of interstice is equal to the cross-sectional area and the 3rd of first magnetic core of the first magnetic pole of first magnetic core The ratio of the cross-sectional area of magnetic pole.
2. element as claimed in claim 1, it is characterised in that:First magnetic core or second magnetic core include the first magnetic Post, the second magnetic pole, the 3rd magnetic pole and spreader, the spreader connects first magnetic pole, second magnetic pole and the described 3rd Same one end of magnetic pole, second magnetic pole is located between first magnetic pole and the 3rd magnetic pole, and first magnetic pole is vertical It is unequal perpendicular to the cross-sectional area of magnetic induction line with the 3rd magnetic pole in the cross-sectional area of magnetic induction line.
3. element as claimed in claim 2, it is characterised in that:First magnetic pole of first magnetic core is perpendicular to magnetic induction line Cross-sectional area be the 3rd magnetic pole of first magnetic core perpendicular to 0.3-0.8 times of the cross-sectional area of magnetic induction line;It is described First magnetic pole of the second magnetic core perpendicular to the cross-sectional area of magnetic induction line be second magnetic core the 3rd magnetic pole it is vertical In 0.3-0.8 times of the cross-sectional area of magnetic induction line.
4. magnetic cell as claimed in claim 3, it is characterised in that:The coil being wound on the center pillar formed common former limit around Group, the coil being wound on first lateral column forms the first vice-side winding, and the coil being wound on second lateral column is formed Second vice-side winding, the common primary side winding constitutes the first transformation as the first primary side winding and first vice-side winding Device, while the common primary side winding constitutes the second transformer as the second primary side winding and second vice-side winding.
5. magnetic cell as claimed in claim 3, it is characterised in that:The coil being wound in the first magnetic pole of first magnetic core The first primary side winding is formed, coil in the first magnetic pole of second magnetic core is wound on and is formed the first vice-side winding, described the One primary side winding and first vice-side winding constitute the first transformer;The line being wound in the 3rd magnetic pole of first magnetic core Circle forms the second primary side winding, and the coil being wound in the 3rd magnetic pole of second magnetic core forms the second vice-side winding, described Second primary side winding and second vice-side winding constitute the second transformer;First primary side winding and second former limit around Group is connected in series.
6. a kind of active clamp positive and negative excitation circuit, including primary circuit, integrated magnetic component, secondary rectification and capacitor filter, The secondary rectification and capacitor filter include rectification circuit and filter circuit;It is characterized in that:
The integrated magnetic component is the integrated magnetic component as described in any one of claim 4-5;
The primary circuit connects the secondary rectification and capacitor filter, the primary circuit by the integrated magnetic component Connect the first primary side winding of the integrated magnetic component and the second primary side winding of the integrated magnetic component, the integrated magnetic component The first vice-side winding and the second vice-side winding of the integrated magnetic component connect the rectification circuit, the rectification circuit connection The filter circuit.
7. circuit as claimed in claim 6, it is characterised in that:First primary side winding and first vice-side winding are constituted The first transformer be normal shock transformer, the second transformer that second primary side winding and second vice-side winding are constituted is Flyback transformer.
8. circuit as claimed in claim 7, it is characterised in that:The cross-sectional area of the first magnetic pole of first magnetic core is described 0.5 times of the cross-sectional area of the 3rd magnetic pole of the first magnetic core, width and the width of the interstice of first air gap Ratio is also 0.5.
9. circuit as claimed in claim 6, it is characterised in that:First magnetic core of the integrated magnetic component and the shape of the second magnetic core Shape is PQ types.
10. a kind of Switching Power Supply, it is characterised in that the Switching Power Supply includes the active pincers described in any one of claim 6-9 The positive and negative excitation circuit in position.
CN201480000048.0A 2014-03-05 2014-03-05 Magnetic core, integrated magnetic element, active clamp forward-flyback circuit and switch power supply Active CN104025217B (en)

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