Integrated magnetic part and switching power supply

Abstract

The invention discloses an integrated magnetic part which comprises a magnetic core and a PCB winding, the PCB winding comprises a primary winding and a plurality of secondary windings, the magnetic core comprises a magnetic column, a top cover and a bottom cover, the magnetic column of the magnetic core comprises a middle column and side columns arranged on the two sides of the middle column, the primary winding is wound on the middle column, and the secondary windings are wound outside the middle column and one side column and do not penetrate through the middle column and the side column. Fractional turns of winding is formed through the side columns. Compared with the prior art, the integrated magnetic part has the advantages that by changing the winding method of the secondary windings, the integrated magnetic part structure meeting various application requirements can be achieved.

Description

Technical Field

[0001] The present invention relates to magnetic components, in particular to an integrated magnetic component composed of a transformer and an inductor and a switching power supply. Background Art

[0002] With the rapid development of switching power supply technology, power supply products are gradually moving towards high efficiency, compact size, high frequency, and flat design. In switching power supply design, the two most important components are power semiconductors and magnetic components. With the advent of third-generation power semiconductors, represented by GaN and SiC, switching device losses have been significantly reduced, creating room for further improvements in power density in switching power supplies.

[0003] However, the magnetic components currently used in products mainly use discrete transformers and inductors. Among them, the discrete transformer magnetics are traditionally wound with both the primary and secondary sides wound around the center column. This leads to problems such as a large number of winding turns, high losses, and expensive copper costs in high-turns-ratio, low-voltage, and high-current applications. At the same time, the use of discrete inductor magnetics will further increase the product's board space and losses. Magnetic components occupy approximately 15%-20% of the board space of the entire power supply product, and occupy a relatively large proportion in switching power supplies. Therefore, if integrated magnetics are used to integrate transformers and inductor magnetics or multiple transformer magnetics into one, the size and losses of multiple discrete magnetics can be effectively reduced, bringing a qualitative improvement to the performance of power supply products.

[0004] Currently, conventional magnetic integration solutions include separate winding of the primary and secondary sides, matrix magnetics, and decoupled magnetic integration. Separate winding of the primary and secondary sides can achieve magnetic integration of the inductor and transformer using leakage inductance, but the integrated inductance is limited. Matrix magnetics and decoupled magnetic integration can achieve magnetic integration of the inductor and transformer, or multiple transformers and multiple inductors, while effectively reducing the height of the magnetic components. However, they cannot reuse transformer and inductor columns. Furthermore, these two conventional magnetic integration solutions cannot effectively reduce the number of winding turns, limiting their applicability in high-turns-ratio applications.

[0005] Therefore, an innovative integrated magnetics solution is needed that can realize the reuse integration of transformers and inductors and reduce the number of transformer turns to further improve the performance of power supply products. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies and discloses a novel integration technology. Unlike conventional methods of separate primary and secondary winding, matrix magnetics, and decoupled magnetic integration, this innovative technology integrates transformer and inductor magnetic integration and fractional-turn technology. This technology addresses the technical issues associated with discrete or conventional integrated magnetic components, such as large board space requirements, high winding turns, high losses, and high copper costs. By integrating transformer and inductor components, or integrating multiple transformers magnetically and using fractional-turn technology, the board space, number of turns, losses, and costs of magnetic components can be effectively reduced, improving overall product performance.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: An integrated magnetic component includes a magnetic core and a PCB winding, the PCB winding including a primary winding and multiple secondary windings, the magnetic core including a magnetic column, a top cover, and a bottom cover, the magnetic columns of the magnetic core including a center column and side columns arranged on both sides of the center column; the primary winding is wound on the center column; the secondary winding is wound outside the center column and one side column without passing between the two, so as to form a fractional turn winding through the side columns.

[0008] Preferably, the secondary winding includes a first secondary winding and a second secondary winding, the side column includes a first side column and a second side column, the first secondary winding is wound outside the first side column and the middle column and does not pass between the first side column and the middle column, and the second secondary winding is wound outside the second side column and the middle column and does not pass between the second side column and the middle column.

[0009] Preferably, the secondary winding includes a first secondary winding and a second secondary winding, the side column includes a first side column and a second side column, the first secondary winding is wound on the first side column, and the second secondary winding is wound outside the first side column and the middle column and does not pass between the first side column and the middle column to form a winding that is shared by the first secondary winding and the second secondary winding; or the first secondary winding is wound on the second side column, and the second secondary winding is wound outside the second side column and the middle column and does not pass between the second side column and the middle column to form a winding that is shared by the first secondary winding and the second secondary winding.

[0010] Preferably, the magnetic column may have an air gap for application in different circuit topologies.

[0011] The present invention also provides a switching power supply, comprising the above-mentioned integrated magnetic component, wherein the secondary winding comprises two, and the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component. The working conditions of the two secondary windings and the magnetic core are that, within half a cycle, one secondary winding and the magnetic core form a transformer with secondary fractional turns, and one secondary winding and the magnetic core form an inductor; and the working conditions of the secondary winding are switched once every half cycle to ensure that a transformer with secondary fractional turns and an inductor are stably formed in the secondary circuit within one cycle, and full-wave rectification is achieved by connecting the winding line ends of the two secondary windings to the circuit topology in an independent lead-out manner.

[0012] Preferably, the two secondary windings are respectively the first secondary winding and the second secondary winding, and the connection relationship of the secondary circuit of the full-wave rectification is that one end of the first secondary winding is connected to one end of the capacitor Co via the first diode D1, one end of the second secondary winding is connected to one end of the capacitor Co via the second diode D2, and the other end of the capacitor Co is connected to the other end of the first secondary winding and the other end of the second secondary winding, and the capacitor Co is used to be connected in parallel at both ends of the output load Ro.

[0013] The present invention further provides a switching power supply, comprising the above-mentioned integrated magnetic component, wherein the secondary windings include four, and the four secondary windings and the primary winding share a set of integrated magnetic cores to form two transformers with secondary fractional turns, and the winding wire ends of the four secondary windings are independently led out to connect to the circuit topology to achieve full-wave rectification.

[0014] Preferably, the four secondary windings are respectively the first secondary winding, the second secondary winding, the third secondary winding and the fourth secondary winding. The first and third secondary windings are wound outside the first side column and the middle column and do not pass between the first side column and the middle column. The second and fourth secondary windings are wound outside the second side column and the middle column and do not pass between the second side column and the middle column. The circuit connection relationship of the secondary full-wave rectification of the integrated magnetic component is that one end of the first and second secondary windings is connected to one end of the capacitor Co through the first diode D1, and the other end of the first and second secondary windings is connected to the other end of the capacitor Co; one end of the third and fourth secondary windings is connected to one end of the capacitor Co through the second diode D2, and the other end of the third and fourth secondary windings is connected to the other end of the capacitor Co; the capacitor Co is used to be connected in parallel at both ends of the output load Ro; when the integrated magnetic component operates in the positive half cycle, the first and second secondary windings operate simultaneously, which is equivalent to two transformers in parallel; when the integrated magnetic component operates in the negative half cycle, the third and fourth secondary windings operate simultaneously, which is equivalent to two transformers in parallel.

[0015] The present invention further provides a switching power supply, comprising the above-mentioned integrated magnetic component, wherein the secondary winding comprises two, and the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component to form a transformer with secondary fractional turns, and the winding line ends of the two secondary windings are connected in parallel to the circuit topology to realize full-bridge rectification.

[0016] Preferably, the two secondary windings are respectively the first secondary winding and the second secondary winding, and the circuit connection relationship of the full-bridge rectifier is that one end of the first secondary winding and one end of the second secondary winding are respectively connected to the anode of the third diode D3 and the cathode of the fourth diode D4, the other end of the first secondary winding and the other end of the second secondary winding are respectively connected to the anode of the first diode D1 and the cathode of the second diode D2, the cathode of the first diode D1 and the cathode of the third diode D3 are connected together to one end of the capacitor Co, the anode of the second diode D2 and the anode of the fourth diode D4 are connected together to the other end of the capacitor Co, and the capacitor Co is used to be connected in parallel across the output load Ro.

[0017] Preferably, the switching power supply adopts a frequency modulation control method with a 50% duty cycle.

[0018] This invention mainly takes the two perspectives of magnetic circuit integration and reuse and fractional-turn technology into consideration, and discloses an integrated magnetic component design solution that is compatible with the development of future power supply products. Compared with the existing technology, the beneficial effects are as follows: 1. Through magnetic integration technology, we achieve the multiplexing of one transformer column and one inductor column, or the magnetic integration of two transformers; compared with discrete magnetic components, this effectively reduces the size and loss of magnetic components; 2. The fractional-turn technology effectively reduces the number of turns of the primary winding, reduces the height of the core window, and reduces the loss and cost of the copper winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1a A three-dimensional structural diagram of an integrated magnetic component according to a first embodiment of the present invention; Figure 1b Schematic diagram of the top view of the winding structure of the magnetic column winding of the integrated magnetic component of the first embodiment of the present invention; Figure 2 This is a schematic diagram of a secondary circuit of an integrated magnetic component used in a full-wave rectifier according to a first embodiment of the present invention; Figure 3 This is a schematic diagram of a secondary circuit of an integrated magnetic component used in a full-bridge rectifier according to a first embodiment of the present invention; Figure 4 A full-wave rectifier fractional-turn resonant topology of the integrated magnetic component of the first embodiment of the present invention Figure 5 This is the main working output waveform of a full-wave rectifier fractional-turn resonant topology using the magnetic component of the first embodiment of the present invention; Figure 6a A schematic diagram of a top view of a magnetic column winding structure and a secondary circuit of an integrated magnetic component according to a second embodiment of the present invention; Figure 6b A schematic diagram of another top view of a magnetic column winding structure and a secondary circuit of an integrated magnetic component according to a second embodiment of the present invention; Figure 7 This is a schematic diagram of a top view of a magnetic column winding structure and a secondary circuit of an integrated magnetic component according to the third embodiment of the present invention.

[0020] The reference numerals in the above drawings are described as follows: 101 first side column, 103 second side column, 102 middle column, 104 primary winding, 105 first secondary winding, 106 second secondary winding, 107 bottom cover, 108 top cover 201 first side column, 203 second side column, 202 center column, 204 primary winding, 205 first secondary winding, 206 second secondary winding, 207 common connection point 301 first side column, 303 second side column, 302 center column, 304 primary winding, 305 first secondary winding, 306 second secondary winding, 307 third secondary winding, 308 fourth secondary winding Vin is the power input terminal, Cin is the input capacitor, Cr is the resonant capacitor, P1 is the upper switch tube, P2 is the lower switch tube, D1 is the first diode, D2 is the second diode, D3 is the third diode, D4 ​​is the fourth diode, Co is the capacitor, and Ro is the output load. The diode has two symbols, solid and hollow, which represent the conductive / non-conductive states in the working cycle respectively. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can better understand the invention. However, the specific implementation of the technical solution of the present invention is not limited thereto.

[0022] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0024] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" etc. are usually used with reference to the directions shown in the drawings, or with reference to the vertical, perpendicular or gravity directions of the components themselves; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0025] See also Figures 1a to 7 The present invention is conceived mainly from the two perspectives of magnetic circuit integration and reuse and fractional turn technology, and innovatively improves an integrated magnetic component, including a magnetic core and a PCB winding. The PCB winding includes a primary winding and multiple secondary windings. The magnetic core includes a magnetic column, a top cover and a bottom cover. The magnetic column of the magnetic core includes a middle column and side columns arranged on both sides of the middle column. The primary winding is wound on the middle column, and the secondary winding is wound outside the middle column and one side column and does not pass between the two, so as to form a fractional turn winding through the side columns.

[0026] Preferably, the secondary winding includes a first secondary winding 105 and a second secondary winding 106, and the side poles include a first side pole 101 and a second side pole 103. The first secondary winding 105 is wound outside the first side pole 101 and the center pole 102 and does not pass between the first side pole 101 and the center pole 102. The second secondary winding 106 is wound outside the second side pole 103 and the center pole 102 and does not pass between the second side pole 103 and the center pole 102. In other embodiments, the secondary winding may be improved to include a first secondary winding and a second secondary winding, and the side poles include a first side pole and a second side pole. The first secondary winding is wound outside the first side pole and the center pole and does not pass between the first side pole and the center pole, and the second secondary winding is wound on the first side pole. Air gaps may also be provided on the magnetic poles for application in different circuit topologies.

[0027] By applying the integrated magnetic component of the present invention to a switching power supply, a switching power supply can be obtained, including the integrated magnetic component of the present invention, wherein the secondary winding includes two, the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component, and the working conditions of the two secondary windings and the magnetic core are that, within half a cycle, one secondary winding and the magnetic core form a transformer with secondary fractional turns, and one secondary winding and the magnetic core form an inductor; and the working conditions of the secondary winding are switched once every half a cycle to ensure that a transformer with secondary fractional turns and an inductor are stably formed in the secondary circuit within one cycle, and full-wave rectification is achieved by connecting the winding line ends of the two secondary windings to the circuit topology in an independent lead-out manner. Figure 2 As shown, the two secondary windings are the first secondary winding 105 and the second secondary winding 106. The connection relationship of the secondary circuit of the full-wave rectification is that one end of the first secondary winding 105 is connected to one end of the capacitor C via the diode D1, one end of the second secondary winding 106 is connected to one end of the capacitor C via the diode D2, and the other end of the capacitor C is connected to the other end of the first secondary winding and the other end of the second secondary winding. The capacitor C is used to be connected in parallel across the output load Ro.

[0028] The integrated magnetic component stack of the present invention is applied to a switching power supply to obtain a switching power supply including the integrated magnetic component of the present invention, wherein the secondary windings include four, and the four secondary windings and the primary winding share a set of integrated magnetic component cores to form two transformers with secondary fractional turns, and the winding ends of the four secondary windings are independently led out to connect to the circuit topology to realize two-stage parallel full-wave rectification. Figure 7As shown, the four secondary windings are respectively the first secondary winding 305, the second secondary winding 306, the third secondary winding 307 and the fourth secondary winding 308. The first transformer operates in the positive half cycle, and the circuit connection relationship of the full-wave rectification is that one end of the first secondary winding 305 is connected to one end of the capacitor C via the diode D1, one end of the second secondary winding 306 is connected to one end of the capacitor C via the diode D2, and the other end of the capacitor C is connected to the other end of the first secondary winding and the other end of the second secondary winding; the second transformer operates in the negative half cycle, and the circuit connection relationship of the full-wave rectification is that one end of the third secondary winding 307 is connected to one end of the capacitor C via the diode D1, one end of the fourth secondary winding 308 is connected to one end of the capacitor C via the diode D2, and the other end of the capacitor C is connected to the other end of the third secondary winding and the other end of the fourth secondary winding. The capacitor C is used to be connected in parallel across the output load Ro.

[0029] The integrated magnetic component of the present invention is applied to a switching power supply, and a switching power supply including the integrated magnetic component of the present invention can be obtained, wherein the secondary winding includes two, and the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component to form a transformer with secondary fractional turns, and the winding ends of the two secondary windings are connected in parallel to the circuit topology to realize full-bridge rectification. Figure 3 As shown, the two secondary windings are respectively a first secondary winding 105 and a second secondary winding 106. The circuit connection relationship of the full-bridge rectifier is that one end of the first secondary winding 105 and one end of the second secondary winding 106 are respectively connected to the anode of the diode D3 and the cathode of the diode D4, one end of the first secondary winding and the other end of the second secondary winding are respectively connected to the anode of the diode D1 and the cathode of the diode D2, the cathode of the diode D1 and the cathode of the diode D3 are connected together to one end of the capacitor C, the anode of the diode D2 and the anode of the diode D4 are connected together to the other end of the capacitor C, and the capacitor C is used to be connected in parallel across the output load Ro.

[0030] The integrated magnetic component of the present invention can realize an integrated magnetic component structure that meets the application requirements of magnetic components in various circuits by changing the winding methods of multiple secondary windings. By dividing the magnetic flux on the primary side into 1 / 2 and realizing fractional turns on the secondary side, the number of turns of the primary and secondary windings is reduced, the height is reduced, the copper loss is reduced, and the cost is reduced. By changing the winding method of the secondary side, the inductor column and the transformer column can be shared, and the coupled magnetic integration of the inductor and the transformer can be realized. And by changing the winding method of the secondary side, the magnetic integration of two transformers in parallel can be realized. Therefore, the application range of the three-magnetic column transformer is broadened through magnetic integration, and the volume and loss of the magnetic component can be significantly and effectively reduced compared with discrete devices.

[0031] First embodiment The first embodiment provides a fractional-turn integrated magnetic component and a switching power supply, such as Figure 1aA three-dimensional structural diagram of an integrated magnetic component provided in Example 1 includes: a middle column 102 of the magnetic core, a first side column 101, a second side column 103, a top cover 108 and a bottom cover 107, and the winding includes a primary winding 104, a first secondary winding 105 and a second secondary winding 106.

[0032] like Figure 1b This is a schematic diagram of the top view of the magnetic column winding structure of the integrated magnetic component of the first embodiment. The primary winding 104 is wound around the magnetic core center column 102, and the first secondary winding 105 is wound around the first side column 101 and the magnetic core center column 102 without passing between the first side column 101 and the magnetic core center column 102; the second secondary winding 106 is wound around the second side column 103 and the magnetic core center column 102 without passing between the second side column 103 and the magnetic core center column 102. Through the above winding method, the AC magnetic flux flowing through the primary winding 104 can be twice the AC magnetic flux flowing through the first secondary winding 105 and the second secondary winding 106, thereby achieving the effect of reducing the number of primary winding turns by half compared to the number of primary winding turns of the integer-turn magnetic component, forming a new fractional-turn integrated magnetic component structure.

[0033] like Figure 2 As shown, if the first secondary winding 105 and the second secondary winding 106 are independently connected, full-wave rectification can be used. One end of the first secondary winding 105 is connected to one end of the capacitor Co via a diode D1, and one end of the second secondary winding 106 is connected to one end of the capacitor Co via a diode D2. The other end of the capacitor Co is connected to the other ends of the first secondary winding 105 and the other end of the secondary winding 106. The capacitor Co is connected in parallel across the output load Ro. The first side leg 101 and the second side leg 102 of the magnetic core enable the reuse of one transformer leg and one inductor leg, thus achieving magnetic integration of a transformer and an inductor.

[0034] like Figure 3 As shown, if the first secondary winding 105 and the second secondary winding 106 are connected in parallel, a full-bridge rectifier can be used. One end of the first secondary winding 105 and one end of the second secondary winding 106 are connected to the anode of the third diode D3 and the cathode of the fourth diode D4, respectively. The other end of the first secondary winding 105 and the other end of the second secondary winding 106 are connected to the anode of the first diode D1 and the cathode of the second diode D2, respectively. The cathode of the first diode D1 and the cathode of the third diode D3 are connected together to one end of the capacitor Co, and the anode of the second diode D2 and the anode of the fourth diode D4 are connected together to the other end of the capacitor Co. The capacitor Co is connected in parallel across the output load Ro. The magnetic integration of the two transformers is achieved through the first side leg 101 and the second side leg 102 of the magnetic core.

[0035] The first side column 101, the middle column 102, and the second side column 103 of the magnetic core of the integrated magnetic component can have the same air gap at the same time; the middle column 102 can have an air gap, and then the first side column 101 and the second side column 103 can have the same air gap; the middle column 102 can have no air gap, and then the first side column 101 and the second side column 103 can have the same air gap; or the middle column 102 can have an air gap, and then the first side column 101 and the second side column 103 can have no air gap.

[0036] The integrated magnetic component can adopt a full-wave or full-bridge rectification structure and is suitable for various topology applications, such as resonant circuits, hard full-bridge topologies, etc.

[0037] Here, the application of the integrated magnetic component of the first embodiment is introduced by taking a full-wave rectified fractional-turn resonant circuit topology as an example. Figure 4 As shown, it is an equivalent circuit connection diagram of the integrated magnetic component of the first embodiment and a full-wave rectifier resonant circuit topology, the primary winding 104 and the resonant capacitor Cr are connected in series to 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 composed of the secondary rectifier first diode D1 and the secondary rectifier first diode D2, and the full-wave rectifier circuit B1 is connected to the output load Ro; the first side column 101 of the magnetic core and the second side column 102 of the magnetic core are realized by alternating half cycles of the secondary rectifier first diode D1 and the secondary rectifier second diode D2. In one working cycle, the magnetic column multiplexing function of half a cycle as a transformer column and half a cycle as a resonant inductor column is realized.

[0038] The control of the resonant topology is achieved by using 50% duty cycle frequency modulation control. By reasonably setting the inductance parameters of the integrated magnetic components and other power level parameters of the full-wave rectifier resonant topology, the circuit can be made to work normally. The working waveform is as follows: Figure 5 As shown; where 501 is the driving waveform of the switch tube P1 on the primary half-bridge inverter circuit, 502 is the driving waveform of the switch tube P2 on the primary half-bridge inverter circuit, 503 is the current waveform of the 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, and 506 is the output voltage waveform of the topology, where Time / mSecs represents Figure 5 The time axis on the horizontal axis is in milliseconds, and 10uSecs / div means that one division represents 10 microseconds.

[0039] like Figure 5As shown, when the first secondary winding 105 is turned on and outputs current, the first side column 101 of the magnetic core serves as a transformer column, and the second side column 103 of the magnetic core serves as an inductor column; when the first secondary winding 106 is turned on and outputs current, the second side column 103 of the magnetic core serves as a transformer column, and the first side column 101 of the magnetic core serves as an inductor column; therefore, the first side column 101 of the magnetic core and the second side column 102 of the magnetic core realize the magnetic column multiplexing function of serving as a transformer column for half a cycle and as a resonant inductor column for half a cycle within one working cycle.

[0040] Second embodiment The second embodiment provides a fractional-turn integrated magnetic component, which includes: a magnetic core including three magnetic columns, a top cover and a bottom cover, and a winding including two primary windings and two secondary windings; like Figure 6a This is a schematic diagram of the top view structure of the magnetic column winding of the integrated magnetic component of the second embodiment. The primary winding 204 is wound on the middle column 202 of the magnetic core, and a three-port secondary winding structure can be realized by sharing part of the winding between the first secondary winding 105 and the second secondary winding 106 of the first embodiment of the present invention.

[0041] like Figure 6a As shown, the secondary winding of the three-port is a fractional-turn secondary winding structure, which can be composed of two parts; the first secondary winding 205 only passes through the slot between the core center column 202 and the core second side column 203, forming a half-turn fractional-turn structure; the second secondary winding 206 is wound around the second side column 203 and the core center column 202 and does not pass between the second side column 203 and the core center column 202; the connection point between the first secondary winding 205 and the second secondary winding 206 is 207, so as to share part of the winding of the second secondary winding 206.

[0042] like Figure 6b As shown, another magnetic column winding structure is shown. The secondary winding of the three ports is a fractional turn secondary winding structure, which can be composed of two parts. The second secondary winding 206 is wound around the first side column 201 of the magnetic core and the middle column 202 of the magnetic core and does not pass between the first side column 201 of the magnetic core and the middle column 202 of the magnetic core; the first secondary winding 205 only passes through the slot between the middle column 202 of the magnetic core and the first side column 201 of the magnetic core, forming a half-turn fractional turn structure; the connection point of the first secondary winding 205 and the second secondary winding 206 is 207, so as to share part of the winding of the second secondary winding 206.

[0043] Therefore, by utilizing the secondary fractional-turn technology and by sharing part of the winding between the second secondary winding 206 and the first secondary winding 205, a three-port fractional-turn secondary winding structure can be realized. This structure can effectively reduce the length of the winding and the number of winding layers, but the secondary winding is also limited to one turn.

[0044] Through the above-mentioned winding method of the primary and secondary windings, it can be achieved that the AC magnetic flux flowing through the primary winding 204 is twice the AC magnetic flux flowing through the first secondary winding 205 and the second secondary winding 206, thereby achieving the effect of reducing the number of turns of the primary winding by half compared to the number of turns of the primary winding of the integer-turn magnetic component.

[0045] In the second embodiment, a new fractional-turn integrated magnetic component structure is formed by using the fractional-turn technology of the primary and secondary windings.

[0046] like Figure 6a As shown, the three-port secondary winding structure consisting of a first secondary winding 205 and a second secondary winding 206 can adopt full-wave rectification. One end of the first secondary winding 205 is connected to one end of a capacitor Co via a diode D2, and one end of the second secondary winding 206 is connected to one end of a capacitor Co via a diode D1. The other end of the first secondary winding 205 is connected to the second secondary winding 206, and the other end of the capacitor Co is connected to the other end of the second secondary winding 206. The capacitor Co is connected in parallel across the output load Ro, thereby achieving the reuse of a transformer leg and an inductor leg, that is, achieving magnetic integration of a transformer and an inductor.

[0047] like Figure 6b As shown, the three-port secondary winding structure consisting of the secondary winding 205 and the secondary winding 206 can adopt full-wave rectification. One end of the second secondary winding 206 is connected to one end of the capacitor Co via the diode D2, and one end of the first secondary winding 205 is connected to one end of the capacitor Co via the diode D1. The other end of the first secondary winding 205 is connected to the second secondary winding 206, and the other end of the capacitor Co is connected to the other end of the second secondary winding 206. The capacitor Co is used to be connected in parallel at both ends of the output load Ro, thereby realizing the reuse of a transformer column and an inductor column, that is, realizing the magnetic integration of a transformer and an inductor.

[0048] The first side column 201, the middle column 202, and the second side column 203 of the integrated magnetic component can have the same air gap at the same time; the middle column 202 can have an air gap, and then the first side column 201 and the second side column 203 can have the same air gap; the middle column 202 can have no air gap, and then the first side column 201 and the second side column 203 can have the same air gap; or the middle column 202 can have an air gap, and then the first side column 201 and the second side column 203 can have no air gap.

[0049] The integrated magnetic component can adopt a full-wave rectification structure and is applicable to various topological applications, such as resonant circuits, hard full-bridge topologies, etc.

[0050] Third embodiment The third embodiment provides a fractional-turn integrated magnetic component, which includes: a magnetic core including three magnetic columns, a top cover and a bottom cover; and a winding including a primary winding and four secondary windings.

[0051] like Figure 7 As shown, it is a schematic diagram of the top structure of the integrated magnetic component of the third embodiment, in which the primary winding 304 is wound on the core center column 302, and the winding structure of the secondary winding is based on the two secondary windings of the integrated magnetic component of the first embodiment of the present invention, and two secondary windings are added, namely, the first secondary winding 305 wound outside the first side column 301 of the magnetic core and the core center column 302 and does not pass between the first side column 301 of the magnetic core and the core center column 302, and the second secondary winding 305 wound outside the second side column 303 of the magnetic core and the core center column 302 and does not pass through the second side column 303 of the magnetic core. On the basis of the second secondary winding 306 passing between the side column 303 and the core center column 302, a third secondary winding 307 is added which is wound around the first side column 301 of the magnetic core and the core center column 302 and does not pass between the first side column 301 of the magnetic core and the core center column 302, and a fourth secondary winding 308 is added which is wound around the second side column 303 of the magnetic core and the core center column 302 and does not pass between the second side column 303 of the magnetic core and the core center column 302, thereby forming an integrated magnetic component structure containing four secondary windings.

[0052] Through the above-mentioned winding method of the primary and secondary windings, the AC magnetic flux flowing through the primary winding 304 can be achieved, which is twice the AC magnetic flux flowing through the first secondary winding 305, the second secondary winding 306, the third secondary winding 307, and the fourth secondary winding 308, thereby achieving the effect of reducing the number of turns of the primary winding by half compared to the number of turns of the primary winding of the integer-turn magnetic component, thereby forming a new fractional-turn integrated magnetic component structure.

[0053] like Figure 7As shown, the integrated magnetic component structure containing four secondary windings: by connecting the first secondary winding 305 and the second secondary winding 306 in parallel, and the third secondary winding 307 and the fourth secondary winding 308 in parallel, full-wave rectification can be adopted, the first secondary winding 305 and the third secondary winding 307 are wound outside the first side column 301 of the magnetic core and the middle column 302 of the magnetic core and do not pass between the first side column 301 of the magnetic core and the middle column 302 of the magnetic core, the second secondary winding 306 and the fourth secondary winding 308 are wound outside the second side column 303 of the magnetic core and the middle column 302 of the magnetic core and do not pass between the second side column 303 of the magnetic core and the middle column 302 of the magnetic core; the circuit connection relationship of the secondary full-wave rectification of the integrated magnetic component is that the first secondary winding 305 and the second secondary winding 306 are wound outside the first side column 301 of the magnetic core and the middle column 302 of the magnetic core and do not pass between the second side column 303 of the magnetic core and the middle column 302 of the magnetic core; One end is connected to one end of the capacitor Co via the diode D1, and the other end of the first secondary winding 305 and the second secondary winding 306 is connected to the other end of the capacitor Co; one end of the third secondary winding 307 and the fourth secondary winding 308 is connected to one end of the capacitor Co via the diode D2, and the other end of the third secondary winding 307 and the fourth secondary winding 308 is connected to the other end of the capacitor Co; the capacitor Co is used to be connected in parallel across the output load Ro; when the integrated magnetic component operates in the positive half cycle, the first secondary winding 305 and the second secondary winding 306 operate simultaneously, which is equivalent to two transformers in parallel; when the integrated magnetic component operates in the negative half cycle, the third secondary winding 307 and the fourth secondary winding 308 operate simultaneously, which is equivalent to two transformers in parallel, realizing the magnetic integration of two transformers.

[0054] The first side column 301, the middle column 302, and the second side column 303 of the magnetic core of the integrated magnetic component can have the same air gap on all three columns at the same time; an air gap can be opened on the middle column 302, and then the first side column 301 and the second side column 302 of the magnetic core can have another identical air gap; the middle column 302 of the magnetic core can have no air gap, and then the first side column 301 and the second side column 303 of the magnetic core can have another identical air gap; the middle column 302 of the magnetic core can have an air gap, and then the first side column 301 and the second side column 303 of the magnetic core can have no air gap.

[0055] The integrated magnetic component can adopt a full-wave rectification structure and is applicable to various topological applications, such as resonant circuits, hard full-bridge topologies, etc.

[0056] The embodiments described above are merely illustrative of the technical solutions and contents of the present invention. It should be noted that the above embodiments should not be construed as limiting the present invention. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention. However, such improvements and modifications do not deviate from the spirit of the present invention or exceed the scope defined by the appended claims and should be considered within the scope of protection of the present invention.

Claims

1. An integrated magnetic component, comprising a magnetic core and a PCB winding, wherein the PCB winding comprises a primary winding and multiple secondary windings, and the magnetic core comprises a magnetic column, a top cover, and a bottom cover, characterized in that: The magnetic columns of the magnetic core include a central column and side columns arranged on both sides of the central column; The primary winding is wound on the middle column; the secondary winding is wound outside the middle column and one side column without passing through the middle column and one side column, so as to form a fractional turn winding through the side column.

2. The integrated magnetic component according to claim 1, characterized in that: The secondary winding includes a first secondary winding and a second secondary winding, and the side column includes a first side column and a second side column. The first secondary winding is wound outside the first side column and the middle column and does not pass between the first side column and the middle column. The second secondary winding is wound outside the second side column and the middle column and does not pass between the second side column and the middle column.

3. The integrated magnetic component according to claim 1, wherein: The secondary winding includes a first secondary winding and a second secondary winding, and the side column includes a first side column and a second side column. The first secondary winding is wound on the first side column, and the second secondary winding is wound outside the first side column and the middle column and does not pass between the first side column and the middle column to form a winding that is shared by the first secondary winding and the second secondary winding; or the first secondary winding is wound on the second side column, and the second secondary winding is wound outside the second side column and the middle column and does not pass between the second side column and the middle column to form a winding that is shared by the first secondary winding and the second secondary winding.

4. The integrated magnetic component according to any one of claims 1 to 3, characterized in that: The magnetic column can be provided with an air gap for application in different circuit topologies.

5. A switching power supply comprising the integrated magnetic component according to any one of claims 1 to 4, characterized in that: The secondary windings include two, and the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component. The working condition of the two secondary windings and the magnetic core is that within half a cycle, one secondary winding and the magnetic core form a transformer with secondary fractional turns, and one secondary winding and the magnetic core form an inductor; and the working condition of the secondary winding is switched once every half cycle to ensure that a transformer with secondary fractional turns and an inductor are stably formed in the secondary circuit within one cycle, and full-wave rectification is achieved by connecting the winding wire ends of the two secondary windings to the circuit topology in an independent manner.

6. The switching power supply according to claim 5, wherein: The two secondary windings are respectively the first secondary winding and the second secondary winding. The connection relationship of the secondary circuit of the full-wave rectification is that one end of the first secondary winding is connected to one end of the capacitor Co via the first diode D1, one end of the second secondary winding is connected to one end of the capacitor Co via the second diode D2, and the other end of the capacitor Co is connected to the other end of the first secondary winding and the other end of the second secondary winding. The capacitor Co is used to be connected in parallel at both ends of the output load Ro.

7. A switching power supply comprising the integrated magnetic component according to any one of claims 1 to 4, characterized in that: The four secondary windings and the primary winding share a set of integrated magnetic cores to form two transformers with secondary fractional turns. The four secondary windings are connected to the circuit topology by independently leading out the winding wire ends of the four secondary windings to achieve full-wave rectification.

8. The switching power supply according to claim 7, wherein: The four secondary windings are respectively the first secondary winding, the second secondary winding, the third secondary winding and the fourth secondary winding. The first and third secondary windings are wound outside the first side column and the middle column and do not pass between the first side column and the middle column. The second and fourth secondary windings are wound outside the second side column and the middle column and do not pass between the second side column and the middle column. The circuit connection relationship of the secondary full-wave rectification of the integrated magnetic component is that one end of the first and second secondary windings is connected to one end of the capacitor Co through the first diode D1, and the other end of the first and second secondary windings is connected to the other end of the capacitor Co; one end of the third and fourth secondary windings is connected to one end of the capacitor Co through the second diode D2, and the other end of the third and fourth secondary windings is connected to the other end of the capacitor Co; the capacitor Co is used to be connected in parallel at both ends of the output load Ro; when the integrated magnetic component operates in the positive half cycle, the first and second secondary windings operate simultaneously, which is equivalent to two transformers in parallel; when the integrated magnetic component operates in the negative half cycle, the third and fourth secondary windings operate simultaneously, which is equivalent to two transformers in parallel.

9. A switching power supply comprising the integrated magnetic component according to any one of claims 1 to 4, characterized in that: The two secondary windings include two, and the two secondary windings and the primary winding share the magnetic core of the integrated magnetic component to form a transformer with secondary fractional turns, and the winding line ends of the two secondary windings are connected in parallel to the circuit topology to realize full-bridge rectification.

10. The switching power supply according to claim 9, characterized in that: The two secondary windings are respectively the first secondary winding and the second secondary winding. The circuit connection relationship of the full-bridge rectifier is that one end of the first secondary winding and one end of the second secondary winding are respectively connected to the anode of the third diode D3 and the cathode of the fourth diode D4, the other end of the first secondary winding and the other end of the second secondary winding are respectively connected to the anode of the first diode D1 and the cathode of the second diode D2, the cathode of the first diode D1 and the cathode of the third diode D3 are jointly connected to one end of the capacitor Co, the anode of the second diode D2 and the anode of the fourth diode D4 are jointly connected to the other end of the capacitor Co, and the capacitor Co is used to be connected in parallel across the output load Ro.

11. The switching power supply according to any one of claims 5 to 10, characterized in that: The switching power supply adopts a frequency modulation control mode with a 50% duty cycle.

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