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 invention relates to the field of electronics, in particular to a magnetic core, an integrated magnetic element, an active clamping forward and reverse excitation circuit and a switching power supply.
Background
The rapid development of power electronics, and in particular microprocessors, presents significant challenges to the power modules that supply them. While various technical means are applied to improve the performance of a module power supply, magnetic elements (magnetic elements for short, including a magnetic core and a coil wound on the magnetic core) are increasingly found to be an important factor limiting the size, weight and efficiency of the power supply. According to the american society of power manufacturers (PSMA), the volume of the magnetic elements in a DC-DC (direct current to direct current) module accounts for more than 20% of the total volume and more than 30% by weight of the total weight.
The active clamping forward and reverse excitation circuit is a commonly used power supply circuit at present, has the excellent characteristics of simple circuit topology, small voltage spike, capability of realizing zero-voltage switching and the like, and is widely applied to medium and low power direct current conversion occasions. The magnetic integrated circuit adopted by the active clamping forward and reverse excitation circuit in the prior art integrates two ordinary transformers on one magnetic element, simplifies the circuit structure to a certain extent, and reduces the volume of the magnetic element. However, the circuit only simply makes two transformers for realizing a forward circuit and a flyback circuit on one magnetic element, the volume and the weight of the magnetic element are still larger, the utilization rate of a magnetic core is not high, and the volume and the weight of the magnetic element also have a further reduced space.
Disclosure of Invention
The embodiment of the invention discloses a magnetic core, an integrated magnetic element, an active clamping forward and backward excitation circuit and a switching power supply, which can achieve the technical effects of reducing the volume of the magnetic core and the integrated magnetic element and increasing the utilization rate of the magnetic core of the integrated magnetic element in the active clamping forward and backward excitation circuit and the switching power supply.
The first aspect of the embodiments of the present invention discloses a magnetic core, which specifically includes:
the magnetic pole comprises a first magnetic pole, a second magnetic pole, a third magnetic pole and a transverse pole, wherein the transverse pole is connected with the same ends of the first magnetic pole, the second magnetic pole and the third magnetic pole, the second magnetic pole is positioned between the first magnetic pole and the third magnetic pole, and the cross section area of the first magnetic pole perpendicular to the magnetic induction line is not equal to the cross section area of the third magnetic pole perpendicular to the magnetic induction line.
The second aspect of the embodiments of the present invention discloses an integrated magnetic component, which specifically includes:
the coil comprises a closed magnetic core consisting of a first magnetic core and a second magnetic core, and a coil wound on the closed magnetic core; the method is characterized in that:
the first magnetic core and the second magnetic core are the magnetic cores disclosed in the first aspect of the embodiment of the present invention, and the first magnetic core and the second magnetic core have the same size; wherein,
the second magnetic columns of the first magnetic core and the second magnetic columns of the second magnetic core are opposite to each other in pairs and are in contact with each other to form a middle column of the closed magnetic core;
the first magnetic columns of the first magnetic core and the first magnetic columns of the second magnetic core are opposite in pairs and are not in contact with each other, so that a first side column of the closed magnetic core is formed; a first air gap is formed between the first magnetic pillar of the first magnetic core and the first magnetic pillar of the second magnetic core;
the third magnetic columns of the first magnetic core and the second magnetic core are opposite in pairs and are not in contact with each other, so that a second side column of the closed magnetic core is formed; a second air gap is formed between the third magnetic pillar of the first magnetic core and the third magnetic pillar of the second magnetic core;
and the coils are wound on the closed magnetic cores to form two groups of transformers.
The third aspect of the embodiments of the present invention discloses an active clamp forward and reverse excitation circuit, which specifically includes:
the primary side circuit, the integrated magnetic element, the secondary side rectification and capacitance filtering circuit includes a rectification circuit and a filtering circuit; the method is characterized in that: the primary side circuit is connected with the secondary side rectifying and capacitance filtering circuit through the integrated magnetic element, the primary side circuit is connected with the first primary side winding and the second primary side winding, the first secondary side winding and the second secondary side winding are connected with the rectifying circuit, and the rectifying circuit is connected with the filtering circuit, wherein the integrated magnetic element is the integrated magnetic element disclosed by the second aspect of the embodiment of the invention.
The fourth aspect of the embodiment of the invention discloses a switching power supply, which comprises the active clamping forward and reverse excitation circuit disclosed by the third aspect of the embodiment of the invention.
According to the embodiment of the invention, the cross sectional areas of the first magnetic column and the third magnetic column of the magnetic core are set to be unequal; the magnetic core is adopted in the integrated magnetic element, and the proportion of the distance between the first magnetic pillar of the first magnetic core and the first magnetic pillar of the second magnetic core, namely the width of the first air gap, and the distance between the third magnetic pillar of the first magnetic core and the third magnetic pillar of the second magnetic core, namely the width of the second air gap is set to be the proportion of the cross-sectional areas of the first magnetic pillar and the third magnetic pillar of the magnetic core, so that the normal passing of a magnetic loop is not influenced; in the active clamping forward and reverse excitation circuit, the first magnetic column participates in forming a forward transformer, the third magnetic column participates in forming a reverse excitation transformer, the cross sectional areas of the first magnetic column and the third magnetic column of the magnetic core are set to be unequal, the size and the weight of the magnetic core are reduced while the normal function of the forward and reverse excitation circuit is realized, the size and the weight of the active forward and reverse excitation circuit and the switching power supply are further reduced, and the utilization rate of the magnetic core in the circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a magnetic core of an embodiment of the present invention;
FIG. 2 is a bottom view of a magnetic core of an embodiment of the present invention;
fig. 3 is a schematic diagram of a first integrated magnetic component in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a second integrated magnetic component in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an active clamp forward and flyback circuit according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of an active clamp flyback circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a switching power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The magnetic core, the integrated magnetic element comprising the magnetic core and the active clamping forward and reverse excitation circuit comprising the integrated magnetic element are disclosed by the embodiment of the invention, wherein the cross sectional areas of the first magnetic column and the third magnetic column of the magnetic core are not equal; in the integrated magnetic element comprising the magnetic core, coils wound on the magnetic core form two groups of transformers; in the active clamping forward and reverse excitation circuit comprising the integrated magnetic element, the cross sectional area of the magnetic column of the forward transformer is smaller than that of the flyback transformer, so that the normal work of the forward and reverse excitation circuit is ensured, and the volume and the weight of the circuit are reduced.
Referring to fig. 1, fig. 1 is a front view of a magnetic core according to an embodiment of the invention. The core shown in fig. 1 may be used in coils and transformers for various electronic devices. As shown in fig. 1, the magnetic core 10 includes: first magnetic cylinder 11, second magnetic cylinder 12, third magnetic cylinder 13 and spreader 14, and spreader 14 connects same one end of first magnetic cylinder 11, second magnetic cylinder 12 and third magnetic cylinder 13, and second magnetic cylinder 12 is located between first magnetic cylinder 11 and third magnetic cylinder 13.
Referring to fig. 2, fig. 2 is a bottom view of a magnetic core according to an embodiment of the invention. As shown in fig. 2, the cross-sectional area S1 of the first magnetic pillar 11 is not equal to the cross-sectional area S3 of the third magnetic pillar 13. Wherein, the cross-sectional area refers to the area of the magnetic pillar perpendicular to the magnetic induction line.
Furthermore, the cross section area of the first magnetic pillar perpendicular to the magnetic induction line is 0.3-0.8 times of the cross section area of the third magnetic pillar perpendicular to the magnetic induction line.
The core shown in fig. 1 and 2 may be formed of a core having a PQ-type structure, or may be formed of a core having a shape of E-type, EC-type, EP-type, or the like.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a first integrated magnetic element according to an embodiment of the present invention, and the integrated magnetic element shown in fig. 3 can be used in a switching power supply and a power electronic device, and is responsible for magnetic energy transfer, storage, filtering and electrical isolation. As shown in fig. 3, the integrated magnetic component 300 includes: a closed magnetic core formed by the first magnetic core 310 and the second magnetic core 320, and a coil wound on the closed magnetic core, wherein the first magnetic core 310 and the second magnetic core 320 are the magnetic cores shown in fig. 1 and 2.
Specifically, the second leg 312 of the first magnetic core 310 and the second leg 322 of the second magnetic core 320 are opposite and in contact with each other two by two, and constitute a center leg of the closed magnetic core 330;
the first magnetic pillar 311 of the first magnetic core 310 and the first magnetic pillar 321 of the second magnetic core 320 are opposite and do not contact with each other in pairs to form a first side pillar of a closed magnetic core; a first air gap is formed between the first pillar 311 of the first magnetic core 310 and the first pillar 321 of the second magnetic core 320;
the third magnetic pillar 313 of the first magnetic core 310 and the third magnetic pillar 323 of the second magnetic core 320 are opposite and do not contact with each other in pairs to form a second side pillar of the closed magnetic core; a second air gap is formed between the third magnetic pillar 313 of the first magnetic core 310 and the third magnetic pillar 323 of the second magnetic core 320;
the coil wound on the center pillar forms a common primary winding, the coil wound on the first side pillar forms a first secondary winding Ns301, the coil wound on the second side pillar forms a second secondary winding Ns302, the common primary winding is used as the first primary winding Np301 and the first secondary winding Ns301 to form a first transformer, and the common primary winding is used as the second primary winding Np302 and the second secondary winding Ns302 to form a second transformer.
Further, the distance between the first leg 311 of the first magnetic core 310 and the first leg 321 of the second magnetic core 320 forms the width of the first air gap; the distance between third leg 313 of first core 310 and third leg 323 of second core 320 forms the width of the second air gap; the width of the first air gap is not equal to the width of the second air gap.
Further, the ratio of the width of the first air gap to the width of the second air gap is equal to the ratio of the cross-sectional area of the first leg 311 of the first magnetic core 310 to the cross-sectional area of the third leg 313 of the first magnetic core 310.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second integrated magnetic element according to an embodiment of the present invention, and the integrated magnetic element shown in fig. 4 is the same as the integrated magnetic element shown in fig. 3, except that the winding manner of the coil is different, as shown in fig. 4:
the coil wound on the first leg 411 of the first magnetic core 410 forms a first primary winding Np401, the coil wound on the first leg 421 of the second magnetic core 420 forms a first secondary winding Ns301, and the first primary winding Np401 and the first secondary winding Ns401 form a first transformer; the coil wound on the third magnetic pillar 413 of the first magnetic core 410 forms a second primary winding Np402, the coil wound on the third magnetic pillar 423 of the second magnetic core 420 forms a second secondary winding Ns402, and the second primary winding Np402 and the second secondary winding Ns402 form a second transformer; the first primary winding Np401 and the second primary winding Np402 are connected in series.
Further, the distance between the first leg 411 of the first magnetic core 410 and the first leg 421 of the second magnetic core 420 forms the width of the first air gap; the distance between third leg 413 of first core 410 and third leg 423 of second core 420 forms the width of the second air gap; the width of the first air gap is not equal to the width of the second air gap.
Further, the ratio of the width of the first air gap to the width of the second air gap is equal to the ratio of the cross-sectional area of the first leg 411 of the first magnetic core 410 to the cross-sectional area of the third leg 413 of the first magnetic core 410.
The above illustration is only two coil winding manners of the integrated magnetic component, but the coil winding manner is not limited in the present invention, and the coils are wound on the closed magnetic core to form two sets of transformers.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an active clamp forward and flyback circuit according to an embodiment of the present invention; the active clamp forward and reverse excitation circuit shown in fig. 5 is widely used in transformers, switching power supplies, and power electronic devices. As shown in fig. 5, the active clamp forward flyback circuit 500 includes: the circuit comprises a primary side circuit 501, an integrated magnetic element 504 and a secondary side rectifying and capacitive filtering circuit, wherein the secondary side rectifying and capacitive filtering circuit comprises a rectifying circuit 502 and a filtering circuit 503; the method is characterized in that: the primary side circuit 501 is connected with the secondary side rectifying and capacitance filtering circuit through the integrated magnetic element 504, the primary side circuit 501 connected with the input end is connected with a first primary side winding Np501 of the integrated magnetic element and a second primary side winding Np502 of the integrated magnetic element, the first secondary side winding Ns501 of the integrated magnetic element and the second secondary side winding Ns502 of the integrated magnetic element are connected with the rectifying circuit 502, and the rectifying circuit 502 is connected with the filtering circuit 503; wherein the integrated magnetic elements are integrated magnetic elements as shown in any of fig. 3-4.
Specifically, a first transformer formed by the first primary winding Np501 and the first secondary winding Ns501 is a forward transformer, and a second transformer formed by the second primary winding Np502 and the second secondary winding Ns502 is a flyback transformer.
The forward transformer is a transformer forming a forward circuit in an active clamping forward and backward excitation circuit, the main function is energy transfer, the transformer does not need to store energy, and the ideal energy transfer ratio of the forward transformer is 1: 1, the loss of the transformer is very small, so that a smaller transformer can realize larger transmission power; the flyback transformer is a transformer forming a flyback circuit in an active clamping forward and reverse flyback circuit, and mainly has the functions of storing energy in a magnetic core of the transformer and then transmitting the energy to a secondary side circuit from the magnetic core, and the energy transmission is realized by a larger transformer. According to the working principle of the forward transformer and the flyback transformer, the sizes of the transformers required by the forward circuit and the flyback circuit are different.
In the embodiment of the invention, the forward transformer consists of a first primary winding Np501 and a first secondary winding Ns501 wound on a first side column and a middle column of a closed magnetic core of an integrated magnetic element 504, and the flyback transformer consists of a second primary winding Np502 and a second secondary winding Ns502 wound on a second side column and a middle column of the closed magnetic core of the integrated magnetic element 504; thus, the volume of the forward transformer is related to the volume of the first leg of the closed core of the integrated magnetic element 504, and the volume of the flyback transformer is related to the volume of the second leg of the closed core of the integrated magnetic element 504. And the first side column is formed by the first magnetic column of the first magnetic core and the first magnetic column of the second magnetic core, and the second side column is formed by the third magnetic column of the first magnetic core and the third magnetic column of the second magnetic core, so that the volume of the forward transformer is related to the volume of the first magnetic column of the first magnetic core and the second magnetic core, the volume of the flyback transformer is related to the volume of the third magnetic column of the first magnetic core and the second magnetic core, and the first magnetic core and the second magnetic core are consistent in size.
In an embodiment of the present invention, a cross-sectional area of the first pillar of the first core of the integrated magnetic element is set to be different from a cross-sectional area of the third pillar of the first core of the integrated magnetic element, so that a volume of the first pillar is different from a volume of the third pillar.
Furthermore, in the embodiment of the present invention, a ratio of a cross-sectional area of the first leg of the first core of the integrated magnetic element to a cross-sectional area of the third leg of the first core of the integrated magnetic element is set to be 0.3 to 0.8, so that a volume of the forward transformer is smaller than a volume of the flyback transformer, and normal operations of the forward circuit and the flyback circuit are not affected.
The flyback transformer works in a circuit in the form of an energy storage element, so that a magnetic core of the flyback transformer generally needs to be provided with a certain air gap to prevent the saturation of the magnetic core of the transformer, and meanwhile, in order to avoid the deviation of magnetic flux, the forward transformer also needs to be provided with a certain air gap to enable the magnetic resistance of a magnetic loop in the forward transformer to be equal to the magnetic resistance of a magnetic loop in the flyback transformer. The magnitude of the magnetic reluctance is proportional to the size of the cross-sectional area of the transformer leg and inversely proportional to the width of the air gap.
In the embodiment of the invention, a first air gap, namely an air gap of a forward transformer, is formed between the first magnetic column of the first magnetic core and the first magnetic column of the second magnetic core, and a second air gap, namely an air gap of a flyback transformer, is formed between the third magnetic column of the first magnetic core and the third magnetic column of the second magnetic core; the distance between the first magnetic pillar of the first magnetic core and the first magnetic pillar of the second magnetic core forms the width of a first air gap, and the distance between the third magnetic pillar of the first magnetic core and the third magnetic pillar of the second magnetic core forms the width of a second air gap; the ratio of the width of the first air gap to the width of the second air gap is set to be equal to the ratio of the cross-sectional area of the first magnetic pillar to the cross-sectional area of the third magnetic pillar.
Preferably, the cross-sectional area of the first pillar of the first magnetic core is 0.5 times the cross-sectional area of the third pillar of the first magnetic core, and the ratio of the width of the first air gap to the width of the second air gap is also 0.5.
In a preferred embodiment, the first core and the second core of the integrated magnetic element 504 are formed of a core having a PQ-type structure.
Referring to fig. 6, fig. 6 is a circuit diagram of an active clamp forward and flyback circuit according to an embodiment of the present invention; the circuit diagram shown in fig. 6 is one specific embodiment of the schematic structure shown in fig. 5. As shown in fig. 6, the active clamp forward flyback circuit includes:
a primary side circuit consisting of an input end, MOS tubes Q6011 and Q6012 and a diode D6011;
a secondary side rectifying circuit composed of rectifying diodes D6021 and D6022;
a capacitor filter circuit composed of a filter diode D6031;
the primary circuit is connected with the secondary rectifying circuit and the capacitor filter circuit through the integrated magnetic element shown in fig. 3, the primary circuit is connected with a first primary winding of the integrated magnetic element and a second primary winding of the integrated magnetic element, and the first primary winding and the second primary winding are the same primary winding in fig. 3; and the first secondary winding of the integrated magnetic element and the second secondary winding of the integrated magnetic element are connected with a secondary rectifying circuit, the secondary rectifying circuit is connected with a capacitor filter circuit, and the capacitor filter circuit is connected with an output end.
In addition to the components and the connection method between the components shown in fig. 6 to form the circuit, the active clamping forward and reverse excitation circuit may also adopt other circuit structures in the prior art, and the present invention is not limited thereto.
Specifically, a first transformer formed by the common primary winding and the first secondary winding is a forward transformer, and a second transformer formed by the common primary winding and the second secondary winding is a flyback transformer.
In the embodiment of the present invention, the ratio of the cross-sectional area of the first leg 60411 of the first core 6041 of the integrated magnetic element to the cross-sectional area of the third leg 60413 of the first core 6041 of the integrated magnetic element 604 is set to 0.3-0.8, so that the volume of the forward transformer is smaller than that of the flyback transformer, and the normal operation of the forward circuit and the flyback circuit is not affected.
In the embodiment of the present invention, the distance between the first leg 60411 of the first magnetic core 6041 and the first leg 60421 of the second magnetic core 6042 forms the width of a first air gap, and the distance between the third leg 60413 of the first magnetic core 6041 and the third leg 60423 of the second magnetic core 6042 forms the width of a second air gap; the ratio of the width of the first air gap to the width of the second air gap is set to be equal to the ratio of the cross-sectional area of the first magnetic pillar 60411 to the cross-sectional area of the third magnetic pillar.
Preferably, the cross-sectional area of the first pillar of the first magnetic core is 0.5 times the cross-sectional area of the third pillar of the first magnetic core, and the ratio of the width of the first air gap to the width of the second air gap is also 0.5.
In a preferred embodiment, the first core and the second core of the integrated magnetic element are formed of a core having a PQ-type structure.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a switching power supply according to an embodiment of the present invention, and the switching power supply 700 shown in fig. 7 includes an active clamp forward/flyback circuit 701 and other circuits 702 shown in fig. 5 or 6.
The circuit in the embodiment of the invention can be combined, divided and deleted according to actual needs.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. The invention is not limited to the specific embodiments disclosed and described above, but several modifications and variations of the invention are also intended to fall within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (13)
1. The utility model provides a magnetic core, includes first magnetism post, second magnetism post, third magnetism post and spreader, the spreader is connected first magnetism post the second magnetism post with the same one end of third magnetism post, the second magnetism post is located first magnetism post with between the third magnetism post, its characterized in that: the cross sectional area of the first magnetic column perpendicular to the magnetic induction line is not equal to the cross sectional area of the third magnetic column perpendicular to the magnetic induction line.
2. The magnetic core according to claim 1, wherein: the cross section area of the first magnetic column perpendicular to the magnetic induction line is 0.3-0.8 times of the cross section area of the third magnetic column perpendicular to the magnetic induction line.
3. An integrated magnetic component comprising a closed core formed by a first core and a second core, and a coil wound around the closed core; the method is characterized in that:
the first and second magnetic cores are as claimed in claim 1 or 2, the first and second magnetic cores being of the same size; wherein,
the second magnetic columns of the first magnetic core and the second magnetic columns of the second magnetic core are opposite to each other in pairs and are in contact with each other to form a middle column of the closed magnetic core;
the first magnetic columns of the first magnetic core and the first magnetic columns of the second magnetic core are opposite in pairs and are not in contact with each other, so that a first side column of the closed magnetic core is formed; a first air gap is formed between the first magnetic pillar of the first magnetic core and the first magnetic pillar of the second magnetic core;
the third magnetic columns of the first magnetic core and the second magnetic core are opposite in pairs and are not in contact with each other, so that a second side column of the closed magnetic core is formed; a second air gap is formed between the third magnetic pillar of the first magnetic core and the third magnetic pillar of the second magnetic core;
and the coils are wound on the closed magnetic cores to form two groups of transformers.
4. The magnetic component of claim 3, wherein: the coil wound on the middle column forms a common primary winding, the coil wound on the first side column forms a first secondary winding, the coil wound on the second side column forms a second secondary winding, the common primary winding serves as the first primary winding and the first secondary winding to form a first transformer, and meanwhile the common primary winding serves as the second primary winding and the second secondary winding to form a second transformer.
5. The magnetic component of claim 3, wherein: a coil wound on the first magnetic pillar of the first magnetic core forms a first primary winding, a coil wound on the first magnetic pillar of the second magnetic core forms a first secondary winding, and the first primary winding and the first secondary winding form a first transformer; a coil wound on the third magnetic column of the first magnetic core forms a second primary winding, a coil wound on the third magnetic column of the second magnetic core forms a second secondary winding, and the second primary winding and the second secondary winding form a second transformer; the first primary winding and the second primary winding are connected in series.
6. The magnetic component of claim 3, wherein: the distance between the first leg of the first magnetic core and the first leg of the second magnetic core forms the width of the first air gap; a distance between the third leg of the first magnetic core and the third leg of the second magnetic core forms a width of the second air gap; the width of the first air gap is not equal to the width of the second air gap.
7. The magnetic component of claim 6, wherein: the ratio of the width of the first air gap to the width of the second air gap is equal to the ratio of the cross-sectional area of the first leg of the first magnetic core to the cross-sectional area of the third leg of the first magnetic core.
8. An active clamp forward-flyback circuit comprises a primary side circuit, an integrated magnetic element and a secondary side rectifying and capacitor filtering circuit, wherein the secondary side rectifying and capacitor filtering circuit comprises a rectifying circuit and a filtering circuit; the method is characterized in that:
the integrated magnetic component being as recited in any one of claims 4-7;
the primary side circuit is connected with the secondary side rectifying and capacitance filtering circuit through the integrated magnetic element, the primary side circuit is connected with a first primary side winding of the integrated magnetic element and a second primary side winding of the integrated magnetic element, the first secondary side winding of the integrated magnetic element and the second secondary side winding of the integrated magnetic element are connected with the rectifying circuit, and the rectifying circuit is connected with the filtering circuit.
9. The circuit of claim 8, wherein: the first transformer formed by the first primary winding and the first secondary winding is a forward transformer, and the second transformer formed by the second primary winding and the second secondary winding is a flyback transformer.
10. The circuit of claim 9, wherein:
the ratio of the cross-sectional area of the first leg of the first core of the integrated magnetic element to the cross-sectional area of the third leg of the first core of the integrated magnetic element is 0.3-0.8;
the distance between the first leg of the first magnetic core and the first leg of the second magnetic core forms the width of the first air gap; a distance between the third leg of the first magnetic core and the third leg of the second magnetic core forms a width of the second air gap;
the ratio of the width of the first air gap to the width of the second air gap is set to be equal to the ratio of the cross-sectional area of the first magnetic pillar to the cross-sectional area of the third magnetic pillar.
11. The circuit of claim 10, wherein: the cross-sectional area of the first magnetic pillar of the first magnetic core is 0.5 times of the cross-sectional area of the third magnetic pillar of the first magnetic core, and the ratio of the width of the first air gap to the width of the second air gap is also 0.5.
12. The circuit of claims 8-11, wherein: the first and second cores of the integrated magnetic component are PQ-shaped.
13. A switching power supply, characterized in that it comprises an active-clamp forward flyback circuit as claimed in any one of claims 8-12.
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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| 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) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107302298A (en) * | 2016-03-31 | 2017-10-27 | 台达电子企业管理（上海）有限公司 | Power module with two-way or multiple-channel output voltage |
| 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 |
| CN110402473A (en) * | 2018-08-17 | 2019-11-01 | 深圳欣锐科技股份有限公司 | The integrated switch power application circuit of integrated transformer and the application integrated transformer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103195U (en) * | 1991-09-24 | 1992-04-29 | 廖正明 | Miniature a. c. electric welder |
| WO2000078100A1 (en) * | 1999-06-15 | 2000-12-21 | Matsushita Electric Industrial Co., Ltd. | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| CN201008125Y (en) * | 2007-01-09 | 2008-01-16 | 南京航空航天大学 | Active Clamp Magnetic Integrated Converter |
| CN101404454A (en) * | 2008-11-24 | 2009-04-08 | 北京新雷能有限责任公司 | Magnetic component integrated active clamp positive and negative laser converter |
| CN101860235A (en) * | 2010-05-04 | 2010-10-13 | 华为技术有限公司 | Magnetic integration transfer circuit system |
| CN203351343U (en) * | 2013-06-20 | 2013-12-18 | 成都金之川电子有限公司 | Asymmetrical integration transformer magnetic core |
| CN203931733U (en) * | 2014-03-05 | 2014-11-05 | 深圳市欣锐特科技有限公司 | A kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010193536A (en) * | 2009-02-16 | 2010-09-02 | Nagano Japan Radio Co | Switching power supply unit |
| CN102739101A (en) * | 2012-06-20 | 2012-10-17 | 东南大学 | Forward-flyback inverter |
-
2014
- 2014-03-05 CN CN201480000048.0A patent/CN104025217B/en active Active
- 2014-03-05 WO PCT/CN2014/072933 patent/WO2015131359A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103195U (en) * | 1991-09-24 | 1992-04-29 | 廖正明 | Miniature a. c. electric welder |
| WO2000078100A1 (en) * | 1999-06-15 | 2000-12-21 | Matsushita Electric Industrial Co., Ltd. | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| CN1316173A (en) * | 1999-06-15 | 2001-10-03 | 松下电器产业株式会社 | Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| CN201008125Y (en) * | 2007-01-09 | 2008-01-16 | 南京航空航天大学 | Active Clamp Magnetic Integrated Converter |
| CN101404454A (en) * | 2008-11-24 | 2009-04-08 | 北京新雷能有限责任公司 | Magnetic component integrated active clamp positive and negative laser converter |
| CN101860235A (en) * | 2010-05-04 | 2010-10-13 | 华为技术有限公司 | Magnetic integration transfer circuit system |
| CN203351343U (en) * | 2013-06-20 | 2013-12-18 | 成都金之川电子有限公司 | Asymmetrical integration transformer magnetic core |
| CN203931733U (en) * | 2014-03-05 | 2014-11-05 | 深圳市欣锐特科技有限公司 | A kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302298B (en) * | 2016-03-31 | 2023-08-29 | 台达电子企业管理（上海）有限公司 | Power supply module with two or more output voltages |
| CN107302298A (en) * | 2016-03-31 | 2017-10-27 | 台达电子企业管理（上海）有限公司 | Power module with two-way or multiple-channel output voltage |
| 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 |
| CN110402473A (en) * | 2018-08-17 | 2019-11-01 | 深圳欣锐科技股份有限公司 | The integrated switch power application circuit of integrated transformer and the application integrated transformer |
| CN110402473B (en) * | 2018-08-17 | 2021-10-19 | 深圳欣锐科技股份有限公司 | Integrated transformer and integrated switching power supply application circuit applying same |
| CN109686538A (en) * | 2018-12-11 | 2019-04-26 | 华为技术有限公司 | A kind of transformer and power supply |
| WO2020119471A1 (en) * | 2018-12-11 | 2020-06-18 | 华为技术有限公司 | Transformer and power supply |
| CN109686538B (en) * | 2018-12-11 | 2020-07-28 | 华为技术有限公司 | Transformer and power supply |
| US11862377B2 (en) | 2018-12-11 | 2024-01-02 | Huawei Technologies Co., Ltd. | Transformer and power supply |
| 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 |
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| CN115691972A (en) * | 2021-07-29 | 2023-02-03 | 中兴通讯股份有限公司 | Inductor, voltage control circuit, and detection and control method of voltage control circuit |
| WO2023005736A1 (en) * | 2021-07-29 | 2023-02-02 | 中兴通讯股份有限公司 | Inductor, voltage control circuit, and detection and control method for voltage control circuit |
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| WO2015131359A1 (en) | 2015-09-11 |
| CN104025217B (en) | 2017-05-10 |
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