An integrated magnetic component and switching power supply

Abstract

The application discloses an integrated magnetic component, which is composed of a magnetic column and top and bottom covers arranged at two ends of the magnetic column. The magnetic column is a two-winding magnetic column, which is simultaneously wound with a primary winding and a secondary winding. The primary windings of the two-winding magnetic columns are connected in series, and two secondary windings for full-wave rectification are wound on the two magnetic columns respectively. The two-winding magnetic columns alternately work between transformer column and inductor column in a working cycle through the reversal of the secondary windings in each half cycle. The integrated magnetic component structure comprises two middle columns which are simultaneously wound with the primary winding and the secondary winding. Through the time-sharing work of the two middle columns, the inductor column and the transformer column can be multiplexed, and the coupling magnetic integration of the transformer and the inductor can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to integrated magnetic components, in particular to an integrated magnetic component for a transformer, an inductor and a switching power supply. BACKGROUND

[0002] With the rapid development of switching power supply technology, power supply products gradually develop towards high efficiency, small size, high frequency and flatness. In the design of switching power supply, the most important two types of devices are power semiconductor devices and magnetic components. With the birth of the third generation of power semiconductor devices represented by GaN and SiC, the loss of switching devices has been significantly reduced, and switching power supply has thus possessed the space for further improving power density.

[0003] However, the magnetic components of the current product end mainly adopt discrete transformer and inductor devices. Among them, the discrete transformer magnetic component is a traditional winding method with the winding column of the primary and secondary sides. In the application field of high turn ratio and low voltage and large current, the winding column will have problems such as large magnetic component height, large winding alternating current loss, high temperature rise and the like due to the large number of winding layers. At the same time, the use of discrete inductor magnetic components will further increase the board space and loss of the product. The magnetic components account for about 15%-20% of the board space of the entire power supply product, and occupy a relatively large proportion in the switching power supply. Therefore, if integrated magnetic components are used, the transformer and inductor magnetic components or multiple transformer magnetic components can be integrated into one, which can effectively reduce the size and loss of multiple discrete magnetic components and bring qualitative improvement to the performance of the power supply product.

[0004] At present, the conventional magnetic integration schemes mainly include primary and secondary side separate winding, matrix magnetic and decoupling magnetic integration. The primary and secondary side separate winding magnetic integration can realize the magnetic integration of inductor and transformer by using leakage inductance, but the integrated inductance is limited, and at the same time the magnetic component height cannot be reduced. The matrix magnetic and decoupling magnetic integration can realize the magnetic integration of inductor and transformer or multiple transformers and multiple inductors, and at the same time can effectively reduce the magnetic component height, but cannot realize the reuse of transformer column and inductor column, resulting in a large board area of the integrated magnetic component, which limits its applicability in high turn ratio application fields.

[0005] Therefore, an innovative integrated magnetic component scheme is needed, which can realize the reuse integration of transformer and inductor, and can also reduce the height and board area of the transformer, so as to further improve the performance of the power supply product. SUMMARY

[0006] The present application provides a new integrated technology, which is different from the conventional primary and secondary side separate winding, matrix magnetic and decoupling magnetic integration, and creatively integrates the reuse magnetic integration of transformer column and inductor column and the matrix magnetic technology into one, thereby improving the technical problems of large board space and large winding loss caused by the use of discrete or conventional integrated magnetic components.

[0007] To achieve the above-mentioned purposes, the application provides the following improved technical solutions.

[0008] An integrated magnetic component is composed of a magnetic column and top and bottom covers arranged at both ends of the magnetic column, the magnetic column is two winding magnetic columns, and the primary winding and the secondary winding are wound on the two winding magnetic columns at the same time, the primary windings of the two winding magnetic columns are connected in series, and the two secondary windings for full-wave rectification are wound on the two magnetic columns respectively, and the two winding magnetic columns are alternately used between transformer column and inductor column in a working cycle through the reversal of the secondary winding every half cycle, that is, the two winding magnetic columns are used as transformer column for half cycle and used as resonant inductor column for half cycle in a working cycle through the reversal of the secondary winding every half cycle.

[0009] Preferably, the integrated magnetic component further comprises an equivalent windingless side column, which is formed by the upper and lower covers and air when the transformer window is relatively low.

[0010] Preferably, the integrated magnetic component further comprises a windingless side column, when the number of the windingless side column is one, the windingless side column is located between the two winding magnetic columns to form a three-magnetic-column integrated magnetic component together with the two winding magnetic columns.

[0011] Preferably, the integrated magnetic component further comprises a windingless side column, when the number of the windingless side column is two, the windingless side columns are respectively located at the left side and the right side of the two winding magnetic columns to form a four-magnetic-column integrated magnetic component together with the two winding magnetic columns; when the number of the windingless side column is more than two, the windingless side columns are respectively located near the two winding magnetic columns to form a multi-magnetic-column integrated magnetic component together with the two winding magnetic columns.

[0012] Preferably, the windingless side column can be arranged in the empty area outside the winding magnetic column, which can be a long strip structure arranged at the entire end portion or a local protruding structure arranged in a dispersed manner at each edge.

[0013] Preferably, the magnetic column can be provided with an air gap to be applied to different circuit topologies.

[0014] The application further provides a switching power supply comprising the integrated magnetic component, the integrated magnetic component comprises two winding magnetic columns, each winding magnetic column is wound with a primary winding and a secondary winding at the same time, the secondary windings of the two winding magnetic columns are connected to a secondary first rectifier D1 and a secondary second rectifier D2 to form a full-wave rectification circuit, and the reversal of the secondary windings every half cycle is controlled by the full-wave rectification of the secondary first rectifier D1 and the secondary second rectifier D2 to realize the reversal of the secondary windings every half cycle.

[0015] Preferably, the primary windings of the two winding magnetic columns are connected in series and connected to a primary half-bridge circuit, a resonant circuit or a full-bridge circuit.

[0016] The application further provides a switching power supply comprising the integrated magnetic component, the integrated magnetic component comprising two winding magnetic columns, each winding magnetic column being wound with a primary winding and a secondary winding, and a non-winding side column, the two secondary windings having four winding modes, one of which is wound on a winding magnetic column respectively, forming non-adjacent common connection terminals of the two secondary windings, the other of which is wound on a winding magnetic column respectively, forming adjacent common connection terminals of the two secondary windings, the third of which is wound on two magnetic columns respectively to form interlaced winding, forming adjacent connection terminals of the two secondary windings, or the fourth of which is half wrapped around the two winding magnetic columns to be connected with the common connection terminals of the two secondary windings and then led out from one side, forming adjacent connection terminals of the two secondary windings.

[0017] The application further provides a switching power supply comprising the integrated magnetic component, the integrated magnetic component comprising two winding magnetic columns, each winding magnetic column being wound with a primary winding and a secondary winding, the two secondary windings having two winding modes, one of which is wound on a winding magnetic column respectively, forming adjacent common connection terminals of the two secondary windings, or the other of which is wound on a winding magnetic column respectively, forming non-adjacent common connection terminals of the two secondary windings.

[0018] The integrated magnetic component of the application mainly from the two angles of magnetic circuit integration reuse and matrix magnetic technology, provides an integrated magnetic component design scheme which meets the future development of power supply products, and the beneficial effects of the prior art are as follows:

[0019] 1. Through the magnetic integration technology of magnetic circuit reuse, the reuse magnetic integration of one transformer column and one inductor column is realized; compared with the discrete and traditional structure magnetic integrated magnetic component, the board area of the magnetic component is effectively reduced;

[0020] 2. Through the matrix magnetic technology, the height of the winding and the magnetic core is effectively reduced, and the height of the magnetic core window and the copper winding loss are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1a It is a three-dimensional structure diagram of the integrated magnetic component of the first embodiment of the application

[0022] Figure 1b It is a magnetic column winding top view structure schematic diagram of the integrated magnetic component of the first embodiment of the application

[0023] Figure 2a It is a magnetic flux distribution diagram of opposite magnetic flux direction of the integrated magnetic component of the first embodiment of the application

[0024] Figure 2b It is a magnetic flux distribution diagram of the same magnetic flux direction of the integrated magnetic component of the first embodiment of the application

[0025] Figure 3The top view equivalent structure schematic diagram of the magnetic column winding of the integrated magnetic component of the first embodiment of the present application;

[0026] Figure 4 The application circuit topology schematic diagram of the integrated magnetic component of the first embodiment of the present application;

[0027] Figure 5 The working waveform diagram of the application circuit topology of the integrated magnetic component of the first embodiment of the present application;

[0028] Figure 6 The top view structure schematic diagram of the magnetic column winding of the integrated magnetic component of the second embodiment of the present application;

[0029] Figure 7a The magnetic flux distribution diagram of the opposite magnetic flux direction of the integrated magnetic component of the second embodiment of the present application;

[0030] Figure 7b The magnetic flux distribution diagram of the same magnetic flux direction of the integrated magnetic component of the second embodiment of the present application;

[0031] Figure 8 The second secondary winding winding schematic diagram of the integrated magnetic component of the second embodiment of the present application when the magnetic flux of the two middle columns is opposite;

[0032] Figure 9 The second secondary winding winding schematic diagram of the integrated magnetic component of the second embodiment of the present application when the magnetic flux of the two middle columns is same;

[0033] Figure 10 The top view structure schematic diagram of the magnetic column winding of the integrated magnetic component of the third embodiment of the present application;

[0034] Figure 11a The magnetic flux distribution diagram of the same magnetic flux direction of the integrated magnetic component of the third embodiment of the present application;

[0035] Figure 11b The magnetic flux distribution diagram of the opposite magnetic flux direction of the integrated magnetic component of the third embodiment of the present application;

[0036] Figure 12 The top view structure schematic diagram of the magnetic column winding of the integrated magnetic component of the fourth embodiment of the present application;

[0037] Figure 13a The magnetic flux distribution diagram of the same magnetic flux direction of the integrated magnetic component of the fourth embodiment of the present application;

[0038] Figure 13b The magnetic flux distribution diagram of the opposite magnetic flux direction of the integrated magnetic component of the fourth embodiment of the present application.

[0039] In the above-mentioned drawings, the reference signs are explained as follows:

[0040] 101 first magnetic column, 102 second magnetic column, 103 first primary winding, 104 second primary winding, 105 first secondary winding, 106 second secondary winding, 107 first connection point, 108 first non-winding side column, 110 top cover, 120 bottom cover;

[0041] 601 third magnetic column, 602 fourth magnetic column, 603 second non-winding side column, 604 third primary winding, 605 fourth primary winding, 606 third secondary winding, 607 fourth secondary winding, 609 second connection point;

[0042] 1001 fifth magnetic column, 1002 sixth magnetic column, 1003 third non-winding side column, 1004 fourth non-winding side column, 1005 fifth primary winding, 1006 sixth primary winding, 1007 fifth secondary winding, 1008 sixth secondary winding, 1009 third connection point;

[0043] 1201 seventh magnetic column, 1202 eighth magnetic column, 1203 fifth non-winding side column, 1204 sixth non-winding side column, 1205 seventh non-winding side column, 1206 eighth non-winding side column, 1207 ninth non-winding side column, 1208 tenth non-winding side column, 1209 seventh primary winding, 1210 eighth primary winding, 1211 seventh secondary winding, 1212 eighth secondary winding, 1213 fourth connection point,

[0044] Vin power input terminal, Cin input terminal capacitor, Cr resonance capacitor, P1 upper switch tube, P2 lower switch tube, D1 first rectifier tube, D2 second rectifier tube, Ro output load, wherein the rectifier tube has two kinds of solid and hollow symbols, which represent the on / off state in the working period. DETAILED DESCRIPTION

[0045] The technical solutions of the present application will be described below in conjunction with the drawings and examples, so that those skilled in the art can better understand the present application. However, the specific implementation of the technical solutions of the present application is not limited thereto.

[0046] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0047] Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0048] In the present application, the orientation words such as "upper", "lower", "left", "right" and the like are generally directed to the directions shown in the drawings, or the directions of the components themselves in the vertical, perpendicular or gravity directions, unless otherwise specified; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0049] Please refer to the accompanying Figure 1a , is the structure view of integrated magnetic component, the integrated magnetic component of the present application is composed of a first magnetic column 101, a second magnetic column 102, and a top cover 110 and a bottom cover 120 arranged at the two ends of the magnetic columns, the magnetic columns are two winding magnetic columns, which are magnetic columns simultaneously wound with primary winding and secondary winding, the first primary winding 103 and the second primary winding 104 of the two winding magnetic columns are connected in series, and the two first secondary windings 105 and the second secondary windings 106 for full-wave rectification are wound on the two magnetic columns respectively, the two winding magnetic columns are alternately used between transformer column and inductor column in one working cycle through the reversal of the secondary winding every half cycle, that is, the two winding magnetic columns are used as transformer column for half cycle and used as resonant inductor column for half cycle in one working cycle through the reversal of the secondary winding every half cycle.

[0050] Preferably, the integrated magnetic component can further include equivalent windingless side columns, which are formed by the upper and lower covers and air when the transformer window is relatively low. The integrated magnetic component can further include windingless side columns, when the number of windingless side columns is one, the windingless side column is located between the two winding magnetic columns to form a three-magnetic-column integrated magnetic component together with the two winding magnetic columns; when the number of windingless side columns is two, the windingless side columns are respectively located on the left side and the right side of the two winding magnetic columns to form a four-magnetic-column integrated magnetic component together with the two winding magnetic columns; when the number of windingless side columns is greater than two, the windingless side columns are respectively located near the two winding magnetic columns to form a multi-magnetic-column integrated magnetic component together with the two winding magnetic columns. The windingless side columns can be arranged in the empty area outside the winding magnetic columns, which can be a long strip structure arranged at the entire end portion or a local protruding structure arranged in a dispersed manner at each edge. The magnetic columns can also be provided with air gaps for application in different circuit topologies.

[0051] As Figure 4 , 5As shown, the integrated magnetic component of the present application can be used to make a switching power supply, wherein the integrated magnetic component includes two winding magnetic columns, i.e. the first magnetic column 101 and the second magnetic column 102, each winding magnetic column is wound with a primary winding and a secondary winding, the first secondary winding 105 and the second secondary winding 106 of the two winding magnetic columns are connected to the first secondary rectifier D1 and the second secondary rectifier D2 respectively to form a full-wave rectification circuit, and the full-wave rectification control of the first secondary rectifier D1 and the second secondary rectifier D2 realizes the inversion conversion of the secondary winding once per half cycle. Preferably, the first primary winding 103 and the second primary winding 104 of the two winding magnetic columns are connected in series to a resonant circuit or a full-bridge circuit. Among them, Figure 4 、 Figure 5 is only an application display of a two-magnetic-column magnetic component structure and a corresponding resonant circuit topology in the invention patent.

[0052] As shown in Figures 7a to 9 , the integrated magnetic component of the present application can also be used to make a switching power supply, wherein the integrated magnetic component includes two winding magnetic columns, i.e. the third magnetic column 601 and the fourth magnetic column 602, each winding magnetic column is wound with a primary winding and a secondary winding, and further includes a second non-winding side column 603. There are four winding methods for the two secondary windings, which can be selected for application. The first is to wind on one winding magnetic column respectively, forming two non-adjacent common connection terminals of the secondary windings (as shown in Figure 7a ). The second is to wind on one winding magnetic column respectively, forming two adjacent common connection terminals of the secondary windings (as shown in Figure 7b ). The third is to wind on two magnetic columns respectively to form interleaved winding, which can form two adjacent connection terminals of the secondary windings (as shown in Figure 8 ). The fourth is to be arranged near the two winding magnetic columns in a half-enclosed manner, and is used to connect the two secondary windings to form two adjacent connection terminals of the secondary windings (as shown in Figure 9 ). Or the fourth is to wind on one winding magnetic column at the same time, and one secondary winding is connected from the side of the winding magnetic column, and the other secondary winding is connected after winding through the non-winding side column, forming a laminated winding, and further forming two adjacent connection terminals of the secondary windings.

[0053] As shown in Figures 11a to 13b , the integrated magnetic component of the present application can also be used to make a switching power supply, wherein the integrated magnetic component includes two winding magnetic columns, i.e. the fifth magnetic column 1001 and the sixth magnetic column 1002, each winding magnetic column is wound with a primary winding and a secondary winding, and there are two winding methods for the two secondary windings, which can be selected for application. The first is to wind on one winding magnetic column respectively, forming two non-adjacent common connection terminals of the secondary windings (as shown in Figure 11a 、 13aThe second is that the common connection terminals of the two secondary side windings are adjacent (as shown in Figure 11b 、 13b ).

[0054] The integrated magnetic component of the present application includes two middle columns winding the primary side winding and the secondary side winding simultaneously. The inductance and transformer function of the two middle columns of the integrated magnetic component are divided to ensure the independent function and operation of one inductor and one transformer of the switching power supply. The inductance and transformer function of the two middle columns of the integrated magnetic component are reversely transformed every half cycle to make one inductor and one transformer work in the whole cycle of the switching power supply, that is, the time-sharing and alternative multiplexing of the inductor column and the transformer column is realized, and the coupled magnetic integration of the transformer and the inductor is realized. The multiplexing magnetic integration of the transformer and the inductor column and the matrix magnetic technology can effectively reduce the board space, winding alternating current loss and magnetic core cost of the magnetic component, and improve the overall performance of the product.

[0055] First embodiment

[0056] The integrated magnetic component and the switching power supply provided by the first embodiment are shown in Figure 1a The three-dimensional structure diagram of the integrated magnetic component provided by the first embodiment includes: a magnetic core including two winding magnetic columns, i.e., a first magnetic column 101 and a second magnetic column 102, and further including a top cover 110 and a bottom cover 120; windings including two primary side windings, i.e., a first primary side winding 103 and a second primary side winding 104, and two secondary side windings, i.e., a first secondary side winding 105 and a second secondary side winding 106.

[0057] As shown in Figure 1b The first primary side winding 103 and the first secondary side winding 105 are wound on the first magnetic column 101, and the second primary side winding 104 and the second secondary side winding 106 are wound on the second magnetic column 102. The first primary side winding 103 and the second primary side winding 104 are connected in series, and the first connection point is 107. The first secondary side winding 105 and the second secondary side winding 106 can realize time-sharing operation of the two secondary side windings through a connection full-wave rectification circuit.

[0058] As shown in Figure 2a 、 Figure 2b The winding directions of the first primary side winding 103 and the second primary side winding 104 can produce magnetic fluxes in the same direction on the first magnetic column 101 and the second magnetic column 102, or produce magnetic fluxes in opposite directions on the first magnetic column 101 and the second magnetic column 102.

[0059] As shown in Figure 3 The edge column without winding is not included, and when the transformer window is relatively low, the upper and lower covers form an equivalent first winding-free edge column 108 with air.

[0060] The integrated magnetic component can be applied in multiple topologies, such as resonant circuits, full-bridge circuits, etc.

[0061] This section uses a full-wave rectified resonant circuit topology as an example to introduce the application scenarios of the integrated magnetic component in Embodiment 1. For example... Figure 4 The diagram shows the equivalent circuit connection of the integrated magnetic components and a resonant circuit topology of a full-wave rectifier using the first embodiment. The first primary winding 103 and the second primary winding 104 are connected in series with the resonant capacitor Cr and connected in series with the primary half-bridge inverter circuit A1. The first secondary winding 105 and the second secondary winding 106 are connected to the full-wave rectifier circuit B1, which is composed of the secondary first rectifier tube D1 and the secondary second rectifier tube D2. The full-wave rectifier circuit B1 is connected to the output load C1. By alternating the operation of the first rectifier tube D1 and the second rectifier tube D2 for half a cycle, the magnetic column multiplexing function of the first magnetic column 101 and the second magnetic column 102 is realized, where half a cycle is used as a transformer column and half a cycle is used as a resonant inductor column in one working cycle.

[0062] This resonant topology is controlled using frequency modulation with a 50% duty cycle. By appropriately setting the inductance parameters of the integrated magnetic components and the other power stage parameters of the full-wave rectified resonant topology, the circuit can achieve normal operation. The operating waveform is as follows: Figure 5 As shown; where 501 is the driving waveform of the upper switch P1 in the primary half-bridge inverter circuit, 502 is the driving waveform of the lower switch P2 in the primary half-bridge inverter circuit, 503 is the current waveform of the first primary winding 103, 504 is the current waveform of the first secondary winding 105, 505 is the current waveform of the second secondary winding 106, 506 is the output voltage waveform of the topology, and Time / mSecs represents... Figure 5 The time axis on the horizontal axis is in milliseconds, and 10uSecs / div means that one cell represents 10 microseconds.

[0063] Second Embodiment

[0064] Embodiment 2 provides an integrated magnetic component, which differs from the first embodiment in that it includes one unwinding side post, forming a three-pillar integrated magnetic component. The specific integrated magnetic component structure includes: a magnetic core comprising two wound magnetic posts (i.e., the third magnetic post 601 and the fourth magnetic post 602), one unwinding side post (i.e., the second unwinding side post 603), a top cover, and a bottom cover; and windings comprising two primary windings (i.e., the third primary winding 604 and the fourth primary winding 605) and two secondary windings (i.e., the third secondary winding 606 and the fourth secondary winding 607).

[0065] like Figure 6The winding structure of the magnetic column of the integrated magnetic component of the second embodiment is shown in the top view. The third primary winding 604 and the third secondary winding 606 are wound on the third magnetic column 601, respectively. The fourth primary winding 605 and the fourth secondary winding 607 are wound on the fourth magnetic column 602, respectively. The third primary winding 604 and the fourth primary winding 605 are connected in series, and the connection point is 608. The third secondary winding 606 and the fourth secondary winding 607 can realize the time-sharing operation of the two secondary windings through the connection of the full-wave rectifier circuit.

[0066] As shown in Figure 7a , 7b , the winding directions of the third primary winding 604 and the fourth primary winding 605 can generate magnetic fluxes in the same direction on the third magnetic column 601 and the fourth magnetic column 602, or generate magnetic fluxes in opposite directions on the third magnetic column 601 and the fourth magnetic column 602.

[0067] When the third primary winding 604 and the fourth primary winding 605 generate magnetic fluxes in opposite directions on the third magnetic column 601 and the fourth magnetic column 602: as shown in Figure 7a , the third secondary winding 606 and the fourth secondary winding 607 can be wound on the third magnetic column 601 and the fourth magnetic column 602, respectively, and the common connection terminals of the two secondary windings are not adjacent. As shown in Figure 8 , the third secondary winding 606 can be wound on the third magnetic column 601 and the second non-winding side column 603 at the same time, and the fourth secondary winding 607 can be wound on the fourth magnetic column 602 and the second non-winding side column 603 at the same time, and the common connection terminals of the two secondary windings are adjacent.

[0068] When the third primary winding 604 and the fourth primary winding 605 generate magnetic fluxes in the same direction on the third magnetic column 601 and the fourth magnetic column 602: as shown in Figure 7b , the third secondary winding 606 and the fourth secondary winding 607 can be wound on the third magnetic column 601 and the fourth magnetic column 602, respectively, and the common connection terminals of the two secondary windings are adjacent. As shown in Figure 9 , the secondary winding can also be arranged in a half-wrapped mode near the two winding magnetic columns, and is composed of a 3-port structure. The 3-port secondary winding is a fractional-turn secondary winding structure. The third secondary winding 606 only passes through the slot between the third magnetic column 601 and the second non-winding side column 603, forming a half-turn fractional-turn structure. The fourth secondary winding 607 only passes through the slot between the second non-winding side column 603 and the fourth magnetic column 602, forming a half-turn fractional-turn structure. The third secondary winding 606 and the fourth secondary winding 607 return to the secondary winding from the outside of the third magnetic column 601 or the fourth magnetic column 602 through the common second connection point 609. As shown in Figure 9 , the secondary winding structure is applicable to all magnetic component structures described in the present application, and here only the magnetic component structure of the second embodiment is taken as an example for introduction.

[0069] The third magnetic post 601, the fourth magnetic post 602, and the second unwinding side post 603 can have the same air gap; the third magnetic post 601 and the fourth magnetic post 602 can have the same air gap, while the second unwinding side post 603 has another air gap; the third magnetic post 601 and the fourth magnetic post 602 can have the same air gap, while the second unwinding side post 603 has no air gap; or the third magnetic post 601 and the fourth magnetic post 602 can have no air gap, while the second unwinding side post 603 has one air gap.

[0070] The integrated magnetic component can be applied in multiple topologies, such as resonant circuits, full-bridge circuits, etc.

[0071] Third Embodiment

[0072] Embodiment 3 provides an integrated magnetic component, which differs from the second embodiment in that it includes two unwinding side posts, forming a four-post integrated magnetic component. Specifically, the integrated magnetic component includes: a magnetic core containing two wound magnetic posts (i.e., the fifth magnetic post 1001 and the sixth magnetic post 1002), two unwinding side posts (i.e., the third unwinding side post 1003 and the fourth unwinding side post 1004), a top cover, and a bottom cover; the windings include two primary windings (i.e., the fifth primary winding 1005 and the sixth primary winding 1006) and two secondary windings (the fifth secondary winding 1007 and the sixth secondary winding 1008).

[0073] like Figure 10 This is a top view schematic diagram of the magnetic post winding structure of the integrated magnetic component in the third embodiment. The fifth primary winding 1005 and the fifth secondary winding 1007 are respectively wound on the fifth magnetic post 1001, and the sixth primary winding 1006 and the sixth secondary winding 1008 are respectively wound on the sixth magnetic post 1002. The fifth primary winding 1005 and the sixth primary winding 1006 are connected in series, and the third connection point is 1009. The fifth secondary winding 1007 and the sixth secondary winding 1008 can achieve timed operation of the two secondary windings by connecting to a full-wave rectifier circuit.

[0074] like Figure 11a , 11b As shown, the winding direction of the fifth primary winding 1005 and the sixth primary winding 1006 can generate magnetic flux in the same direction on the fifth magnetic post 1001 and the sixth magnetic post 1002, or it can generate magnetic flux in opposite directions on the fifth magnetic post 1001 and the sixth magnetic post 1002.

[0075] When including two unwinding side posts, the third unwinding side post 1003 is located to the left of the fifth magnetic post 1001, and the fourth unwinding side post 1004 is located to the right of the sixth magnetic post 1002, a four-magnetic-post integrated magnetic component is formed.

[0076] The fifth magnetic post 1001, the sixth magnetic post 1002, the third unwinding side post 1003, and the fourth unwinding side post 1004 can have the same air gap; the fifth magnetic post 1001 and the sixth magnetic post 1002 can have one identical air gap, while the third unwinding side post 1003 and the fourth unwinding side post 1004 can have another identical air gap; the fifth magnetic post 1001 and the sixth magnetic post 1002 can have one identical air gap, while the third unwinding side post 1003 and the fourth unwinding side post 1004 can have no air gap; or the fifth magnetic post 1001 and the sixth magnetic post 1002 can have no air gap, while the third unwinding side post 1003 and the fourth unwinding side post 1004 can have one identical air gap.

[0077] The integrated magnetic component can be applied in multiple topologies, such as resonant circuits, full-bridge circuits, etc.

[0078] Fourth embodiment

[0079] Embodiment 4 provides an integrated magnetic component, which differs from the third embodiment in that it includes multiple unwound side posts located near the two wound magnetic posts, constituting a multi-pillar integrated magnetic component. Specifically, the integrated magnetic component includes: a magnetic core containing two wound magnetic posts (i.e., the seventh magnetic post 1201 and the eighth magnetic post 1202), multiple unwound side posts, a top cover, and a bottom cover; the windings include two primary windings (i.e., the seventh primary winding 1209 and the eighth primary winding 1210) and two secondary windings (i.e., the seventh secondary winding 1211 and the eighth secondary winding 1212).

[0080] like Figure 12 This is a top view schematic diagram of the magnetic reluctance winding structure of the integrated magnetic component in the fourth embodiment. The winding-free side post structure in the figure is only a schematic structure of multiple winding-free side post structures. The seventh primary winding 1209 and the seventh secondary winding 1211 are wound on the seventh magnetic post 1201, and the eighth primary winding 1210 and the eighth secondary winding 1212 are wound on the eighth magnetic post 1202. The seventh primary winding 1209 and the eighth primary winding 1210 are connected in series, and the fourth connection point is 1213. The seventh secondary winding 1211 and the eighth secondary winding 1212 can achieve the two secondary windings to work in a time manner by connecting a suitable rectifier circuit.

[0081] like Figure 13a , 13b As shown, the winding direction of the seventh primary winding 1209 and the eighth primary winding 1210 can generate magnetic flux in the same direction on the seventh magnetic post 1201 and the eighth magnetic post 1202, or it can generate magnetic flux in opposite directions on the seventh magnetic post 1201 and the eighth magnetic post 1202.

[0082] The seventh magnetic post 1201, the eighth magnetic post 1202, and multiple unwinding side posts can have the same air gap; the seventh magnetic post 1201 and the eighth magnetic post 1202 can have one identical air gap, and the multiple unwinding side posts can have another identical air gap; the seventh magnetic post 1201 and the eighth magnetic post 1202 can have one identical air gap, and the multiple unwinding side posts can have no air gap; or the seventh magnetic post 1201 and the eighth magnetic post 1202 can have no air gap, and the multiple unwinding side posts can have one identical air gap.

[0083] The integrated magnetic component can be applied in multiple topologies, such as resonant circuits, full-bridge circuits, etc.

[0084] The above embodiments are only used to help understand the method and core idea of ​​the present invention. For those skilled in the art, other equivalent application schemes that can be naturally conceived through the above description and examples without departing from the principle of the present invention, as well as some improvements and modifications to the present invention, all fall within the protection scope of the claims of the present invention.

Claims

1. An integrated magnetic device, comprising two magnetic pillars and a top cap and a bottom cap disposed at the ends of the magnetic pillars, characterized in that: Both of the magnetic columns are tape-winding magnetic columns with primary windings and secondary windings, the primary windings of the two tape-winding magnetic columns are connected in series, and the two secondary windings serve as the input terminals of a full-wave rectification circuit; wherein the two tape-winding magnetic columns are alternately used between transformer column and inductor column in a working cycle through the reversal of the secondary windings every half cycle, that is, the two tape-winding magnetic columns are used as transformer columns for half a cycle and as resonant inductor columns for the other half cycle in a working cycle through the reversal of the secondary windings every half cycle.

2. The integrated magnetic component of claim 1, wherein: It also includes equivalent non-winding side columns formed by the upper and lower covers and air when the transformer window is relatively short.

3. The integrated magnetic component of claim 1, wherein: It also includes non-winding side columns, when the number of non-winding side columns is one, the non-winding side column is located between the two tape-winding magnetic columns to form a three-magnetic-column integrated magnetic component together with the two tape-winding magnetic columns.

4. The integrated magnetic component of claim 1, wherein: When the number of non-winding side columns is two, the non-winding side columns are respectively located on the left and right sides of the two tape-winding magnetic columns to form a four-magnetic-column integrated magnetic component together with the two tape-winding magnetic columns; when the number of non-winding side columns is more than two, the non-winding side columns are respectively located near the two tape-winding magnetic columns to form a multi-magnetic-column integrated magnetic component together with the two tape-winding magnetic columns.

5. The integrated magnetic component of claim 4, wherein: The non-winding side columns are located in the empty area outside the tape-winding magnetic columns and are in the form of long strips arranged on the entire end or in the form of local protrusions arranged on the edges.

6. The integrated magnetic component of any one of claims 1 to 5, wherein: The magnetic columns can be opened to form air gaps to be applied to different circuit topologies.

7. A switched mode power supply comprising the integrated magnetic component of any one of claims 1 to 6, the integrated magnetic component comprising two gapped magnetic legs, each gapped magnetic leg simultaneously wound with a primary winding and a secondary winding, characterized in that: The secondary windings of the two tape-winding magnetic columns are respectively connected to the secondary first rectifier D1 and the secondary second rectifier D2 to form a full-wave rectification circuit, and the reversal of the secondary windings every half cycle is controlled by the full-wave rectification of the secondary first rectifier D1 and the secondary second rectifier D2.

8. The switching power supply of claim 7, wherein: The primary windings of the two tape-winding magnetic columns are connected in series and then connected to a primary half-bridge circuit, a resonant circuit or a full-bridge circuit.

9. A switched mode power supply comprising the integrated magnetic component of claim 3, the integrated magnetic component comprising two gapped magnetic legs, each gapped magnetic leg simultaneously wound with a primary winding and a secondary winding, and further comprising a non-gapped leg, characterized in that: There are four winding methods for the two secondary windings, one of which is to wind the two secondary windings on one tape-winding magnetic column to form non-adjacent common connection terminals of the two secondary windings; the second is to wind the two secondary windings on one tape-winding magnetic column to form adjacent common connection terminals of the two secondary windings; the third is to wind the two secondary windings on two magnetic columns to form staggered windings to form adjacent connection terminals of the two secondary windings; or the fourth is to arrange the two secondary windings in a half-wrapped manner near the two tape-winding magnetic columns to form adjacent connection terminals of the two secondary windings after being connected to the common connection terminals of the two secondary windings and then led out from one side.

10. A switched mode power supply comprising the integrated magnetic component of any of claims 1 to 6, the integrated magnetic component comprising two gapped magnetic legs, each gapped magnetic leg simultaneously wound with a primary winding and a secondary winding, characterized in that: There are two winding methods for the two secondary windings, one of which is to wind the two secondary windings on one tape-winding magnetic column to form adjacent common connection terminals of the two secondary windings; or the other is to wind the two secondary windings on one tape-winding magnetic column to form non-adjacent common connection terminals of the two secondary windings.

Images