CN104025217A - 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 PDFInfo
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- CN104025217A CN104025217A CN201480000048.0A CN201480000048A CN104025217A CN 104025217 A CN104025217 A CN 104025217A CN 201480000048 A CN201480000048 A CN 201480000048A CN 104025217 A CN104025217 A CN 104025217A
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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
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/08—Cores, Yokes, or armatures made from powder
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- 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
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- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Dc-Dc Converters (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
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
Technical field
The present invention relates to electronic applications, relate in particular to a kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply.
Background technology
The develop rapidly of the develop rapidly of power electronic technology, especially microprocessor has proposed great challenge to the power module for its power supply.People, when application multiple technologies means improve modular power source performance, more and more find that magnetic element (be called for short magnetic cell, comprise magnetic core and around the coil on magnetic core) is a key factor of restriction power volume, weight, efficiency.According to power supply producer association of the U.S. (PSMA) statistics, magnetic cell volume is at DC-DC(direct current conversion direct current) account for the more than 20% of cumulative volume in module, weight accounts for the more than 30% of total weight.
Active clamp positive and negative excitation circuit is at present conventional a kind of power circuit, has that circuit topology is simple, due to voltage spikes is little, can realize the good characteristics such as zero voltage switch, is widely used in the DC converting occasion of middle low power.The magnetic integrated circuit that in prior art, active clamp positive and negative excitation circuit adopts, is integrated in two common transformers on a magnetic cell, has simplified to a certain extent circuit structure, has reduced the volume of magnetic cell.But this circuit is just made in two transformers realizing forward converter and circuit of reversed excitation on a magnetic cell simply, and the volume and weight of magnetic cell is still larger, and the utilance of magnetic core is not high, the space that the volume and weight of magnetic cell further reduces in addition.
Summary 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 realize the volume that reduces magnetic core and integrated magnetic component, increase the technique effect of the utilance of integrated magnetic component magnetic core in active clamp positive and negative excitation circuit and Switching Power Supply.
Embodiment of the present invention first aspect discloses a kind of magnetic core, specifically comprises:
The first magnetic post, the second magnetic post, the 3rd magnetic post and spreader, described spreader connects same one end of described the first magnetic post, described the second magnetic post and described the 3rd magnetic post, described the second magnetic post is between described the first magnetic post and described the 3rd magnetic post, and described the first magnetic post is unequal perpendicular to the cross-sectional area of magnetic induction line perpendicular to cross-sectional area and described the 3rd magnetic post of magnetic induction line.
Embodiment of the present invention second aspect discloses a kind of integrated magnetic component, specifically comprises:
The closed magnetic core being formed by the first magnetic core and the second magnetic core, and be wound on the coil in described closed magnetic core; It is characterized in that:
Described the first magnetic core and described the second magnetic core are magnetic core as disclosed in embodiment of the present invention first aspect, and described the first magnetic core is consistent with described the second magnetic core size; Wherein,
The second magnetic post of described the first magnetic core and the second magnetic post of described the second magnetic core be relative also contact between two, forms the center pillar of described closed magnetic core;
The first magnetic post of described the first magnetic core is relative between two with the first magnetic post of described the second magnetic core not to be contacted, and forms the first lateral column of described closed magnetic core; Between the first magnetic post of described the first magnetic core and the first magnetic post of described the second magnetic core, form the first air gap;
The 3rd magnetic post of described the first magnetic core is relative between two with the 3rd magnetic post of described the second magnetic core not to be contacted, and forms the second lateral column of described closed magnetic core; Between the 3rd magnetic post of described the first magnetic core and the 3rd magnetic post of described the second magnetic core, form interstice;
Described coil, in described 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 comprises:
Former limit circuit, integrated magnetic component, secondary rectification and capacitor filter, described secondary rectification and electric capacity filter circuit comprise rectification circuit and filter circuit; It is characterized in that: described former limit circuit connects described secondary rectification and electric capacity filter circuit by described integrated magnetic component, described former limit circuit connects described the first former limit winding and described the second former limit winding, described the first secondary winding is connected described rectification circuit with described the second secondary winding, described rectification circuit connects described filter circuit, and wherein said integrated magnetic component is the disclosed integrated magnetic component of embodiment of the present invention second aspect.
Embodiment of the present invention fourth aspect discloses a kind of Switching Power Supply, comprises the disclosed active clamp positive and negative excitation circuit of the embodiment of the present invention third aspect.
The first magnetic post of embodiment of the present invention magnetic core and the cross-sectional area of the 3rd magnetic post are set to unequal; In integrated magnetic component, adopt above-mentioned magnetic core, and by the distance between the first magnetic post of the first magnetic core and the first magnetic post of the second magnetic core also the distance between the width of the first air gap and the 3rd magnetic post of the first magnetic core and the 3rd magnetic post of the second magnetic core be also the ratio of the width of interstice, be set to and the ratio of the first magnetic post of magnetic core and the cross-sectional area of the 3rd magnetic post, not affect the normal current of magnetic loop; In active clamp positive and negative excitation circuit, what the first magnetic post participated in forming is normal shock transformer, what the 3rd magnetic post participated in forming is flyback transformer, the first magnetic post of magnetic core and the cross-sectional area of the 3rd magnetic post are made as unequal, in realizing positive circuit of reversed excitation normal function, reduce the volume and weight of magnetic core, and then reduced the volume and weight of active positive circuit of reversed excitation and Switching Power Supply, improved the utilance of magnetic core in circuit.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the front view of a kind of magnetic core of the embodiment of the present invention;
Fig. 2 is the upward view of a kind 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 the second integrated magnetic component of the embodiment of the present invention;
Fig. 5 is the structural representation of a kind of active clamp positive and negative excitation circuit of the embodiment of the present invention;
Fig. 6 is the circuit diagram of a kind of active clamp positive and negative excitation circuit of the embodiment of the present invention;
Fig. 7 is the structural representation of a kind of Switching Power Supply of the embodiment of the present invention.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The disclosed magnetic core of the embodiment of the present invention, the integrated magnetic component that comprises above-mentioned magnetic core, the active clamp positive and negative excitation circuit that comprises above-mentioned integrated magnetic component, wherein the first magnetic post of magnetic core and the cross-sectional area of the 3rd magnetic post are unequal; In the integrated magnetic component that comprises above-mentioned magnetic core, the coil that is wound on magnetic core forms two groups of transformers; In the active clamp positive and negative excitation circuit that comprises above-mentioned integrated magnetic component, the magnetic post cross-sectional area of normal shock transformer is less than the magnetic post cross-sectional area of flyback transformer, when having ensured the normal work of positive circuit of reversed excitation, has reduced circuit volume and weight.
Refer to Fig. 1, Fig. 1 is the front view of a kind 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, this magnetic core 10 comprises: the first magnetic post 11, the second magnetic post 12, the 3rd magnetic post 13 and spreader 14, spreader 14 connects same one end of the first magnetic post 11, the second magnetic post 12 and the 3rd magnetic post 13, and the second magnetic post 12 is between the first magnetic post 11 and the 3rd magnetic post 13.
Refer to Fig. 2, Fig. 2 is the upward view of a kind of magnetic core of the embodiment of the present invention.As shown in Figure 2, the cross-sectional area S3 of the cross-sectional area S1 of the first magnetic post 11 and the 3rd magnetic post 13 is unequal.Wherein, cross-sectional area refers to the area perpendicular to the magnetic post of magnetic induction line.
Further, the first magnetic post is the 3rd magnetic post perpendicular to 0.3-0.8 times of the cross-sectional area of magnetic induction line perpendicular to the cross-sectional area of magnetic induction line.
Magnetic core shown in Fig. 1 and Fig. 2 is to be made up of the iron core of PQ type structure, in addition, can also be by E type, and the iron core of the shapes such as EC type, EP type forms, and the present invention is not restricted the structure of iron core.
Refer to Fig. 3, Fig. 3 is the structural representation of the first integrated magnetic component of the embodiment of the present invention, and the integrated magnetic component shown in Fig. 3 is used in Switching Power Supply, power electronic equipment, is undertaking transmission, storage and the filtering of magnetic energy and the effect of electrical isolation.As shown in Figure 3, this integrated magnetic component 300 comprises: the closed magnetic core that the first magnetic core 310 and the second magnetic core 320 form, and be wound on the coil in closed magnetic core, wherein the first magnetic core 310 and the second magnetic core 320 are the magnetic cores shown in Fig. 1 and Fig. 2.
Particularly, the second magnetic post 312 of the first magnetic core 310 and the second magnetic post 322 of the second magnetic core 320 be relative and contact between two, the center pillar of formation closed magnetic core 330;
The first magnetic post 311 of the first magnetic core 310 is relative between two with the first magnetic post 321 of the second magnetic core 320 not to be contacted, and forms the first lateral column of closed magnetic core; Between the first magnetic post 311 of the first magnetic core 310 and the first magnetic post 321 of the second magnetic core 320, form the first air gap;
The 3rd magnetic post 313 of the first magnetic core 310 is relative between two with the 3rd magnetic post 323 of the second magnetic core 320 not to be contacted, and forms the second lateral column of closed magnetic core; Between the 3rd magnetic post 313 of the first magnetic core 310 and the 3rd magnetic post 323 of the second magnetic core 320, form interstice;
The coil being wound on center pillar forms common former limit winding, 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 secondary winding Ns302, common former limit winding forms the first transformer as the first former limit winding Np301 and the first secondary winding Ns301, and common former limit winding forms the second transformer as the second former limit winding Np302 and the second secondary winding Ns302 simultaneously.
Further, the distance between the first magnetic post 311 of the first magnetic core 310 and the first magnetic post 321 of the second magnetic core 320 forms the width of the first air gap; Distance between the 3rd magnetic post 313 of the first magnetic core 310 and the 3rd magnetic post 323 of the second magnetic core 320 forms the width of interstice; The width of the first air gap is not equal to the width of interstice.
Further, being in equal proportions of the cross-sectional area of the cross-sectional area of the first magnetic post 311 of the ratio of the width of the first air gap and the width of interstice and the first magnetic core 310 and the 3rd magnetic post 313 of the first magnetic core 310.
Refer to Fig. 4, Fig. 4 is the structural representation of the second integrated magnetic component of the embodiment of the present invention, and the integrated magnetic component shown in Fig. 4 is the same with the integrated magnetic component structure shown in Fig. 3, and difference is the winding method difference of coil, as shown in Figure 4:
The coil being wound on the first magnetic post 411 of the first magnetic core 410 forms the first former limit winding Np401, the coil being wound on the first magnetic post 421 of the second magnetic core 420 forms the first secondary winding Ns301, and the first former limit winding Np401 and the first secondary winding Ns401 form the first transformer; The coil being wound on the 3rd magnetic post 413 of the first magnetic core 410 forms the second former limit winding Np402, the coil being wound on the 3rd magnetic post 423 of the second magnetic core 420 forms the second secondary winding Ns402, and the second former limit winding Np402 and the second secondary winding Ns402 form the second transformer; The first former limit winding Np401 and the second former limit winding Np402 are connected in series.
Further, the distance between the first magnetic post 411 of the first magnetic core 410 and the first magnetic post 421 of the second magnetic core 420 forms the width of the first air gap; Distance between the 3rd magnetic post 413 of the first magnetic core 410 and the 3rd magnetic post 423 of the second magnetic core 420 forms the width of interstice; The width of the first air gap is not equal to the width of interstice.
Further, being in equal proportions of the cross-sectional area of the cross-sectional area of the first magnetic post 411 of the ratio of the width of the first air gap and the width of interstice and the first magnetic core 410 and the 3rd magnetic post 413 of the first magnetic core 410.
The mode of two kinds of coil windings of the just integrated magnetic component above, but the present invention is not restricted the mode of coil winding, and coil, in closed magnetic core, forms two groups of transformers.
Refer to Fig. 5, Fig. 5 is the structural representation of a kind of active clamp positive and negative excitation circuit of the embodiment of the present invention; Active clamp positive and negative excitation circuit shown in Fig. 5 is widely used in transformer, Switching Power Supply, power electronic equipment.As shown in Figure 5, this active clamp positive and negative excitation circuit 500 comprises: former limit circuit 501, integrated magnetic component 504, secondary rectification and capacitor filter, and secondary rectification and electric capacity filter circuit comprise rectification circuit 502 and filter circuit 503; It is characterized in that: former limit circuit 501 connects secondary rectification and capacitor filter by integrated magnetic component 504, the former limit circuit 501 that connects input connects the first former limit winding Np501 of integrated magnetic component and the second former limit winding Np502 of integrated magnetic component, the first secondary winding Ns501 of integrated magnetic component and the second secondary winding Ns502 of integrated magnetic component are connected rectification circuit 502, and rectification circuit 502 connects filter circuit 503; Wherein integrated magnetic component is the integrated magnetic component as shown in figure as arbitrary in Fig. 3-4.
Particularly, the first transformer that the first former limit winding Np501 and the first secondary winding Ns501 form is normal shock transformer, and the second transformer that the second former limit winding Np502 and the second secondary winding Ns502 form is flyback transformer.
Normal shock transformer is the transformer that forms positive activation type circuit in active clamp positive and negative excitation circuit, Main Function is energy transmission, transformer self does not need storage power, desirable normal shock transformer energy transfer ratio is 1:1, the loss of transformer self is very little, so less transformer just can be realized larger through-put power; Flyback transformer is the transformer that forms reverse excitation circuit in active clamp positive and negative excitation circuit, and Main Function is to store energy in the magnetic core of transformer, and then from magnetic core, transfers the energy to secondary circuit, needs larger transformer to realize the transmission of energy.From the operation principle of above normal shock transformer and flyback transformer, the size of forward converter and the needed transformer of circuit of reversed excitation is different.
In the embodiment of the present invention, normal shock transformer is made up of the first lateral column of closed magnetic core and the first former limit winding Np501 and the first secondary winding Ns501 of center pillar that are wound on integrated magnetic component 504, and flyback transformer is made up of the second lateral column of closed magnetic core and the second former limit winding Np502 and the second secondary winding Ns502 of center pillar that are wound on integrated magnetic component 504; 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 the volume size of flyback transformer 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 to be made up of the first magnetic post of the first magnetic core and the first magnetic post of the second magnetic core, the second lateral column is to be made up of the 3rd magnetic post of the first magnetic core and the 3rd magnetic post of the second magnetic core, therefore, the volume size of normal shock transformer is relevant with the volume of the first magnetic post of the first magnetic core and the second magnetic core, the volume size of flyback transformer is relevant with the volume of the 3rd magnetic post of the first magnetic core and the second magnetic core, and the first magnetic core and the second magnetic core size are in the same size.
In the embodiment of the present invention, the cross-sectional area of the 3rd magnetic post of the cross-sectional area of the first magnetic post of the first magnetic core of integrated magnetic component and the first magnetic core of integrated magnetic component is set to different size, so that the volume of the volume of the first magnetic post and the 3rd magnetic post is different.
Further, in the embodiment of the present invention, the ratio of the cross-sectional area of the 3rd magnetic post of the cross-sectional area of the first magnetic post of the first magnetic core of integrated magnetic component and the first magnetic core of integrated magnetic component is made as 0.3-0.8, so that the volume of normal shock transformer is less than the volume of flyback transformer, do not affect again the normal work of forward converter and circuit of reversed excitation simultaneously.
Flyback transformer is to work in circuit with the form of an energy-storage travelling wave tube, therefore the magnetic core of flyback transformer generally need to arrange a certain size air gap, to prevent that magnetic core of transformer is saturated, simultaneously, for avoiding the skew of magnetic flux, in normal shock transformer, also need to arrange a certain size air gap, so that the magnetic resistance equal and opposite in direction of magnetic loop in the magnetic resistance of magnetic loop and flyback transformer in normal shock transformer.The size of magnetic resistance is directly proportional to the size of the cross-sectional area of transformer magnetic post, is inversely proportional to the width of air gap.
In the embodiment of the present invention, between the first magnetic post of the first magnetic core and the first magnetic post of the second magnetic core, form the air gap that the first air gap is normal shock transformer, between the 3rd magnetic post of the first magnetic core and the 3rd magnetic post of the second magnetic core, form the air gap that interstice is flyback transformer; Distance between the first magnetic post of the first magnetic core and the first magnetic post of the second magnetic core forms the width of the first air gap, and the distance between the 3rd magnetic post of the first magnetic core and the 3rd magnetic post of the second magnetic core forms the width of interstice; The ratio setting of the width of the first air gap and the width of interstice is and being in equal proportions of the cross-sectional area of the first magnetic post and the cross-sectional area of the 3rd magnetic post.
As preferably mode of one, the cross-sectional area of the first magnetic post of the first magnetic core is 0.5 times of cross-sectional area of the 3rd magnetic post of the first magnetic core, and the ratio of the width of the first air gap and the width of interstice is also 0.5.
As the preferred mode of one, the first magnetic core of integrated magnetic component 504 and the second magnetic core are made up of the iron core of PQ type structure.
Refer to Fig. 6, Fig. 6 is the circuit diagram of a kind of active clamp positive and negative excitation circuit of the embodiment of the present invention; Circuit diagram shown in Fig. 6 is a specific embodiment of the structural representation shown in Fig. 5.As shown in Figure 6, this active clamp positive and negative excitation circuit comprises:
The former limit circuit being formed by input and metal-oxide-semiconductor Q6011, Q6012 and diode D6011;
The secondary side rectification circuit being formed by rectifier diode D6021, D6022;
The capacitor filter being formed by filtered diode D6031;
Former limit circuit is by integrated magnetic component auxiliary connection side rectification circuit and capacitor filter as shown in Figure 3, former limit circuit connects the first former limit winding of integrated magnetic component and the second former limit winding of integrated magnetic component, and now this first former limit winding and this second former limit winding are all common former limit winding in Fig. 3; The second secondary winding auxiliary connection side rectification circuit of the first secondary winding of integrated magnetic component and integrated magnetic component, secondary side rectification circuit connects capacitor filter, and capacitor filter connects output.
Except adopting the components and parts shown in Fig. 6 and the connected mode forming circuit between components and parts, active clamp positive and negative excitation circuit can also adopt in prior art other circuit structure, and the present invention is not restricted.
Particularly, the first transformer that common former limit winding and the first secondary winding form is normal shock transformer, and the second transformer that common former limit winding and the second secondary winding form is flyback transformer.
In the embodiment of the present invention, the ratio of the cross-sectional area of the 3rd magnetic post 60413 of the cross-sectional area of the first magnetic post 60411 of the first magnetic core 6041 of integrated magnetic component and the first magnetic core 6041 of integrated magnetic component 604 is made as 0.3-0.8, so that the volume of normal shock transformer is less than the volume of flyback transformer, do not affect again the normal work of forward converter and circuit of reversed excitation simultaneously.
In the embodiment of the present invention, distance between the first magnetic post 60411 of the first magnetic core 6041 and the first magnetic post 60421 of the second magnetic core 6042 forms the width of the first air gap, and the distance between the 3rd magnetic post 60413 of the first magnetic core 6041 and the 3rd magnetic post 60423 of the second magnetic core 6042 forms the width of interstice; The ratio setting of the width of the first air gap and the width of interstice is and being in equal proportions of the cross-sectional area of the first magnetic post 60411 and the cross-sectional area of the 3rd magnetic post.
As preferably mode of one, the cross-sectional area of the first magnetic post of the first magnetic core is 0.5 times of cross-sectional area of the 3rd magnetic post of the first magnetic core, and the ratio of the width of the first air gap and the width of interstice is also 0.5.
As the preferred mode of one, the first magnetic core of integrated magnetic component and the second magnetic core are made up of the iron core of PQ type structure.
Refer to Fig. 7, Fig. 7 is the structural representation of a kind of Switching Power Supply of the embodiment of the present invention, and Switching Power Supply 700 as shown in Figure 7 comprises active clamp positive and negative excitation circuit 701 and other circuit 702 as shown in Fig. 5 or 6.
Circuit in the embodiment of the present invention can merge according to actual needs, divides and delete.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned execution mode.The present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention some modifications and changes of invention.Although used some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (13)
1. a magnetic core, comprise the first magnetic post, the second magnetic post, the 3rd magnetic post and spreader, described spreader connects same one end of described the first magnetic post, described the second magnetic post and described the 3rd magnetic post, described the second magnetic post, between described the first magnetic post and described the 3rd magnetic post, is characterized in that: described the first magnetic post is unequal perpendicular to the cross-sectional area of magnetic induction line perpendicular to cross-sectional area and described the 3rd magnetic post of magnetic induction line.
2. magnetic core as claimed in claim 1, is characterized in that: described the first magnetic post is described the 3rd magnetic post perpendicular to 0.3-0.8 times of the cross-sectional area of magnetic induction line perpendicular to the cross-sectional area of magnetic induction line.
3. an integrated magnetic component, comprises the closed magnetic core being made up of the first magnetic core and the second magnetic core, and is wound on the coil in described closed magnetic core; It is characterized in that:
Described the first magnetic core and described the second magnetic core are magnetic core as claimed in claim 1 or 2, and described the first magnetic core is consistent with described the second magnetic core size; Wherein,
The second magnetic post of described the first magnetic core and the second magnetic post of described the second magnetic core be relative also contact between two, forms the center pillar of described closed magnetic core;
The first magnetic post of described the first magnetic core is relative between two with the first magnetic post of described the second magnetic core not to be contacted, and forms the first lateral column of described closed magnetic core; Between the first magnetic post of described the first magnetic core and the first magnetic post of described the second magnetic core, form the first air gap;
The 3rd magnetic post of described the first magnetic core is relative between two with the 3rd magnetic post of described the second magnetic core not to be contacted, and forms the second lateral column of described closed magnetic core; Between the 3rd magnetic post of described the first magnetic core and the 3rd magnetic post of described the second magnetic core, form interstice;
Described coil, in described closed magnetic core, forms two groups of transformers.
4. magnetic cell as claimed in claim 3, it is characterized in that: the coil being wound on described center pillar forms common former limit winding, the coil being wound on described the first lateral column forms the first secondary winding, the coil being wound on described the second lateral column forms the second secondary winding, described common former limit winding forms the first transformer as the first former limit winding and described the first secondary winding, and described common former limit winding forms the second transformer as the second former limit winding and described the second secondary winding simultaneously.
5. magnetic cell as claimed in claim 3, it is characterized in that: the coil being wound on the first magnetic post of described the first magnetic core forms the first former limit winding, the coil being wound on the first magnetic post of described the second magnetic core forms the first secondary winding, and described the first former limit winding and described the first secondary winding form the first transformer; The coil being wound on the 3rd magnetic post of described the first magnetic core forms the second former limit winding, and the coil being wound on the 3rd magnetic post of described the second magnetic core forms the second secondary winding, and described the second former limit winding and described the second secondary winding form the second transformer; Described the first former limit winding is connected with described the second former limit windings in series.
6. magnetic cell as claimed in claim 3, is characterized in that: the distance between the first magnetic post of described the first magnetic core and the first magnetic post of described the second magnetic core forms the width of described the first air gap; Distance between the 3rd magnetic post of described the first magnetic core and the 3rd magnetic post of described the second magnetic core forms the width of described interstice; The width of described the first air gap is not equal to the width of described interstice.
7. magnetic cell as claimed in claim 6, is characterized in that: the ratio of the width of described the first air gap and the width of described interstice equals the ratio of the cross-sectional area of the first magnetic post of described the first magnetic core and the cross-sectional area of the 3rd magnetic post of described the first magnetic core.
8. an active clamp positive and negative excitation circuit, comprises former limit circuit, integrated magnetic component, secondary rectification and capacitor filter, and described secondary rectification and electric capacity filter circuit comprise rectification circuit and filter circuit; It is characterized in that:
Described integrated magnetic component is the integrated magnetic component as described in claim 4-7 any one;
Described former limit circuit connects described secondary rectification and capacitor filter by described integrated magnetic component, described former limit circuit connects the first former limit winding of described integrated magnetic component and the second former limit winding of described integrated magnetic component, the first secondary winding of described integrated magnetic component and the second secondary winding of described integrated magnetic component are connected described rectification circuit, and described rectification circuit connects described filter circuit.
9. circuit as claimed in claim 8, it is characterized in that: the first transformer that described the first former limit winding and described the first secondary winding form is normal shock transformer, the second transformer that described the second former limit winding and described the second secondary winding form is flyback transformer.
10. circuit as claimed in claim 9, is characterized in that:
The ratio of the cross-sectional area of the 3rd magnetic post of the cross-sectional area of the first magnetic post of the first magnetic core of described integrated magnetic component and the first magnetic core of described integrated magnetic component is 0.3-0.8;
Distance between the first magnetic post of described the first magnetic core and the first magnetic post of described the second magnetic core forms the width of described the first air gap; Distance between the 3rd magnetic post of described the first magnetic core and the 3rd magnetic post of described the second magnetic core forms the width of described interstice;
The ratio setting of the width of described the first air gap and the width of described interstice is and being in equal proportions of the cross-sectional area of described the first magnetic post and the cross-sectional area of described the 3rd magnetic post.
11. circuit as claimed in claim 10, it is characterized in that: the cross-sectional area of the first magnetic post of described the first magnetic core is 0.5 times of cross-sectional area of the 3rd magnetic post of described the first magnetic core, and the ratio of the width of described the first air gap and the width of described interstice is also 0.5.
12. circuit as described in claim 8-11, is characterized in that: the PQ type that is shaped as of the first magnetic core of described integrated magnetic component and the second magnetic core.
13. 1 kinds of Switching Power Supplies, is characterized in that, the active clamp positive and negative excitation circuit of described Switching Power Supply as described in claim 8-12 any one.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/072933 WO2015131359A1 (en) | 2014-03-05 | 2014-03-05 | Magnetic core, integrated magnetic component, active clamping forward-flyback circuit and switched-mode power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104025217A true CN104025217A (en) | 2014-09-03 |
| CN104025217B CN104025217B (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201480000048.0A Active CN104025217B (en) | 2014-03-05 | 2014-03-05 | Magnetic core, integrated magnetic element, active clamp forward-flyback circuit and switch power supply |
Country Status (2)
| Country | Link |
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| CN (1) | CN104025217B (en) |
| WO (1) | WO2015131359A1 (en) |
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| CN107731481A (en) * | 2017-08-23 | 2018-02-23 | 广路智能科技有限公司 | A kind of Magnetic circuit topologies integrate magnet |
| CN109686538A (en) * | 2018-12-11 | 2019-04-26 | 华为技术有限公司 | A kind of transformer and power supply |
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| WO2021035574A1 (en) * | 2019-08-28 | 2021-03-04 | 新誉庞巴迪牵引系统有限公司 | Transformer structure, and locomotive traction transformer |
| CN112928927A (en) * | 2021-02-17 | 2021-06-08 | 青岛大学 | Composite active clamping push-pull flyback DC-DC converter |
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Also Published As
| Publication number | Publication date |
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| WO2015131359A1 (en) | 2015-09-11 |
| CN104025217B (en) | 2017-05-10 |
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