Power conversion module and magnetic assembly thereof

Abstract

The present application provides a power conversion module and a magnetic assembly thereof. The magnetic assembly includes a magnetic core assembly and a first secondary winding and a second secondary winding. The magnetic core assembly includes two magnetic covers and first to fourth magnetic columns. The first to fourth magnetic columns are arranged between the two magnetic covers. The first and third magnetic columns are located between the second and fourth magnetic columns. The magnetic reluctance of the second and fourth magnetic columns is greater than that of the first and third magnetic columns. The four magnetic columns jointly define a communication area. A primary winding is wound around the first and third magnetic columns through the communication area. The magnetic flux directions of the first and third magnetic columns are opposite. A first end of the first secondary winding is arranged between the first and second magnetic columns. A second end of the first secondary winding is arranged between the third and fourth magnetic columns. A first end of the second secondary winding is arranged between the first and fourth magnetic columns. A second end of the second secondary winding is arranged between the second and third magnetic columns.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronic devices, in particular to a power conversion module and a magnetic assembly thereof. BACKGROUND

[0002] Modern power electronic devices, as an important part of power conversion, are widely used in power, electronics, motor and energy industries. Ensuring the long-term stable operation of power electronic devices and improving the power conversion efficiency of power electronic devices have always been important goals for those skilled in the art.

[0003] With the rapid development of mobile communication and cloud computing technologies, high-power DC / DC power conversion modules have also been widely used in communication products. Due to the high power and tendency to miniaturization of products, new challenges are posed to the conversion efficiency and volume of power conversion modules.

[0004] Power conversion modules are divided into two-stage power conversion structures and single-stage power conversion structures. The two-stage conversion structure has the problems of low efficiency and complex application. Compared with the two-stage conversion structure, the single-stage conversion structure has the advantages of high efficiency and simple and flexible application, so it is often used in power conversion modules.

[0005] However, in the conventional power conversion module with a single-stage conversion structure, due to the layout of the circuit elements, the conventional power conversion module has certain size limitations. When the conventional power conversion module is applied to long-size and high-density electronic devices such as display cards or ASIC cards, the distance between the two opposite sides of the multiple electronic devices is very narrow due to the limitation condition, so the conventional power conversion module cannot be effectively applied to long-size and high-density electronic devices.

[0006] In addition, in the conventional power conversion module, there is usually a magnetic assembly to form an inductor or a transformer, etc. However, due to the structure of the magnetic core and the winding method of the winding, the magnetic assembly of the conventional power conversion module has large loss, which is not conducive to the improvement of the performance of the power conversion module. In addition, the magnetic assembly of the conventional power conversion module also has the disadvantages of large alternating current ripple and poor current saturation resistance of the magnetic core.

[0007] Therefore, how to develop a power conversion module and a magnetic assembly thereof to solve the problems faced by the prior art and achieve the optimization of the power conversion module is a very important issue in the field. SUMMARY

[0008] The main purpose of the present application is to provide a power conversion module and a magnetic assembly thereof, so as to solve the defects that the conventional power conversion module cannot be effectively applied to the electronic device with long size and high density, and the defects that the conventional power conversion module is not conducive to the performance improvement of the power conversion module due to the large loss of the magnetic assembly. The defects that the conventional power conversion module has the large AC current ripple and the poor anti-current saturation capacity of the magnetic core are also solved.

[0009] To achieve the foregoing purpose, the present application provides a magnetic assembly, comprising: at least one magnetic core assembly, comprising: a first magnetic cover and a second magnetic cover; and a first magnetic column, a second magnetic column, a third magnetic column and a fourth magnetic column, the first magnetic column and the third magnetic column are oppositely arranged between the first magnetic cover and the second magnetic cover, the second magnetic column and the fourth magnetic column are oppositely arranged between the first magnetic cover and the second magnetic cover, the first magnetic column and the third magnetic column are located between the second magnetic column and the fourth magnetic column, the magnetic resistance of the second magnetic column and the fourth magnetic column is larger than that of the first magnetic column and the third magnetic column, respectively, and the first magnetic column, the second magnetic column, the third magnetic column and the fourth magnetic column jointly define a communication area; a primary winding wound on the first magnetic column and the third magnetic column through the communication area, and the magnetic flux directions of the first magnetic column and the third magnetic column are opposite; and a first secondary winding and a second secondary winding, a first end of the first secondary winding is arranged between the first magnetic column and the second magnetic column, a second end of the first secondary winding is arranged between the third magnetic column and the fourth magnetic column, a first end of the second secondary winding is arranged between the first magnetic column and the fourth magnetic column, and a second end of the second secondary winding is arranged between the second magnetic column and the third magnetic column, and part of the first secondary winding and part of the second secondary winding are located in the communication area.

[0010] To achieve the foregoing object, the present application further provides a power conversion module, comprising: a printed circuit board; and a first basic power unit disposed on the printed circuit board and comprising a magnetic assembly, which comprises: at least one magnetic core assembly comprising: a first magnetic cover and a second magnetic cover; and a first magnetic column, a second magnetic column, a third magnetic column and a fourth magnetic column, the first magnetic column and the third magnetic column being oppositely disposed between the first magnetic cover and the second magnetic cover, the second magnetic column and the fourth magnetic column being oppositely disposed between the first magnetic cover and the second magnetic cover, the first magnetic column and the third magnetic column being located between the second magnetic column and the fourth magnetic column, the magnetic resistance of the second magnetic column and the fourth magnetic column being greater than that of the first magnetic column and the third magnetic column respectively, and the first magnetic column, the second magnetic column, the third magnetic column and the fourth magnetic column collectively defining a communication region; a primary winding wound on the first magnetic column and the third magnetic column through the communication region, and the magnetic flux directions of the first magnetic column and the third magnetic column being opposite; and a first secondary winding and a second secondary winding, a first end of the first secondary winding being disposed between the first magnetic column and the second magnetic column, a second end of the first secondary winding being disposed between the third magnetic column and the fourth magnetic column, a first end of the second secondary winding being disposed between the first magnetic column and the fourth magnetic column, and a second end of the second secondary winding being disposed between the second magnetic column and the third magnetic column, and part of the first secondary winding and part of the second secondary winding being located in the communication region; a primary switch circuit; a first secondary rectifier circuit; and a first positive output terminal pin; wherein the primary switch circuit, the first secondary rectifier circuit, the magnetic assembly and the first positive output terminal pin are sequentially arranged along a first direction of the printed circuit board.

[0011] The present application provides a power conversion module and a magnetic assembly thereof, wherein the magnetic resistance of the second magnetic column and the fourth magnetic column of the magnetic core assembly of the power conversion module is greater than that of the first magnetic column and the third magnetic column respectively, and the primary winding and the secondary winding are arranged in a crossing manner, so that the magnetic assembly of the power conversion module has the advantages of small alternating current ripple of the current flowing through the primary winding and the secondary winding and strong current saturation resistance of the magnetic core. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1A and Figure 1B A perspective view of the power conversion module of the first preferred embodiment of the present application from different angles;

[0013] Figure 2 for Figure 1A A circuit topology schematic diagram corresponding to the power conversion module shown in the figure;

[0014] Figure 3 for Figure 2 A voltage timing diagram of the circuit topology shown in the figure;

[0015] Figure 3 for Figure 2 A voltage timing diagram of the circuit topology shown in the figure;

[0016] Figure 4 As shown in Fig. 1, the power conversion module 100 comprises a magnetic assembly 110 and a circuit topology 120. Figure 1A As shown in Fig. 2, the exploded structural schematic diagram of the magnetic assembly 110.

[0017] Figure 5 As shown in Fig. 3, the structural schematic diagram of the magnetic assembly 110 after removing the first magnetic cover. Figure 1A As shown in Fig. 4, the structural schematic diagram of the magnetic assembly 110 after removing the first magnetic cover.

[0018] Figure 6A As shown in Fig. 5, the three-dimensional structural diagram of the power conversion module 100 according to the second preferred embodiment of the present application from different perspectives. Figure 6B

[0019] As shown in Fig. 6, the circuit topology schematic diagram corresponding to the power conversion module 100. Figure 7 Figure 6A As shown in Fig. 7, the structural schematic diagram of the first magnetic assembly 110 in another variation.

[0020] Figure 8 Figure 6A As shown in Fig. 8, the structural schematic diagram of the second magnetic assembly 110 in another variation.

[0021] Figure 9 As shown in Fig. 9, the structural schematic diagram of the magnetic assembly 110 in another variation after removing the first magnetic cover.

[0022] Figure 10A As shown in Fig. 10, the three-dimensional structural diagram of the power conversion module 100 according to the third preferred embodiment of the present application from different perspectives. Figure 10B

[0023] As shown in Fig. 11, the exploded structural schematic diagram of the power conversion module 100. Figure 10C Figure 10A As shown in Fig. 12, the structural schematic diagram of the first magnetic assembly 110 in another variation.

[0024] Figure 11 Figure 10A As shown in Fig. 13, the circuit topology schematic diagram corresponding to the power conversion module 100 according to the fourth preferred embodiment of the present application.

[0025] Figure 12 As shown in Fig. 14, the structural schematic diagram of the magnetic assembly 110 of the power conversion module 100 after removing the first magnetic cover.

[0026] Figure 13 As shown in Fig. 15, the circuit topology schematic diagram corresponding to the power conversion module 100 according to the fifth preferred embodiment of the present application. Figure 12

[0027] As shown in Fig. 16, the structural schematic diagram of the first magnetic assembly 110 in another variation after removing the first magnetic cover. Figure 14

[0028] As shown in Fig. 17, the structural schematic diagram of the second magnetic assembly 110 in another variation after removing the first magnetic cover. Figure 15 Figure 14 As shown in Fig. 18, the structural schematic diagram of the two magnetic assemblies 110 respectively after removing the first magnetic cover.​​​​​

[0029] Figure 16 For Figure 14 Another variation of the two magnetic assemblies shown in the structure schematic diagram after the first magnetic cover is removed.

[0030] The reference signs are as follows:

[0031] 1a, 1b, 1c, 1d, 1e: power conversion module

[0032] Vin+: positive input terminal

[0033] Vin-: negative input terminal

[0034] Vin: input voltage

[0035] Vo+: positive output terminal

[0036] Vo-: negative output terminal

[0037] Vo: output voltage

[0038] 1: primary side switching circuit

[0039] 2: first magnetic assembly

[0040] 3: first secondary side rectifier circuit

[0041] Q1: first switch

[0042] Q2: second switch

[0043] A, B: bridge arm midpoint

[0044] Lin: input inductor

[0045] C1: first capacitor

[0046] C2: second capacitor

[0047] 20: magnetic core assembly

[0048] Np1: primary side winding

[0049] Ns1: first secondary side winding

[0050] Ns2: second secondary side winding

[0051] S1: first rectifier assembly

[0052] S2: second rectifier assembly

[0053] Co: output capacitor

[0054] VQ1, VQ2, VS1, VS2: drive signal VAB: across voltage

[0055] D: duty cycle

[0056] 21: first magnetic cover

[0057] 22, 22a: second magnetic cover

[0058] 23, 23a: first magnetic column

[0059] 24, 24a: second magnetic column

[0060] 25, 25a: third magnetic column

[0061] 26: fourth magnetic column

[0062] 27: communication area

[0063] D1, D2: diode

[0064] 4: printed circuit board

[0065] To1+: first positive output terminal pin X, Y: direction

[0066] S11, S21: first rectifying element

[0067] S12, S22: second rectifying element 40: first surface

[0068] 41: second surface

[0069] Tin: input terminal pin

[0070] To-: negative output terminal pin

[0071] Ts: signal control and detection signal pin 2a: second magnetic assembly

[0072] 3a: second auxiliary side rectifying circuit To2+: second positive output terminal pin 10: driver

[0073] 2b: third magnetic assembly

[0074] Na Na1, Na2: additional winding La: additional inductor DETAILED DESCRIPTION

[0075] Some typical embodiments embodying features and advantages of the present application are described in detail in the following description. It should be appreciated that the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like reference numerals indicate like elements in the drawings. The description and drawings are to be regarded as illustrative in nature and are not to be regarded as limiting to the scope of the application.

[0076] Figure 1A and Figure 1B Fig. 1 is a perspective view of a power conversion module according to a first preferred embodiment of the present application, Figure 2 Fig. 2 is a perspective view of a power conversion module according to a second preferred embodiment of the present application, Figure 1AA circuit topology diagram corresponding to the power conversion module shown, Figure 3 As Figure 2 A voltage timing diagram of the circuit topology shown, Figure 4 As Figure 1A An exploded structural diagram of the magnetic core assembly shown, Figure 5 As Figure 1A A structural diagram of the magnetic assembly after removing the first magnetic cover. The circuit topology of the power conversion module 1a in this embodiment can be similar to that shown in Figure 2 , i.e., the power conversion module 1a is a single-stage power conversion circuit structure, and the power conversion module 1a receives an input voltage Vin via a positive input terminal Vin+ and a negative input terminal Vin-, and outputs an output voltage Vo via a positive output terminal Vo+ and a negative output terminal Vo-. In addition, the power conversion module 1a includes a primary-side switching circuit 1, a first magnetic assembly 2, and a first secondary-side rectification circuit 3. The primary-side switching circuit 1 includes a switching bridge arm to form a half-bridge switching structure, and the switching bridge arm includes a first switch Q1 and a second switch Q2, which are connected in series and form a bridge arm midpoint A between the first switch Q1 and the second switch Q2.

[0077] In some embodiments, the primary-side switching circuit 1 can further include a capacitor bridge arm, and the power conversion module 1a further includes an input inductor Lin. The capacitor bridge arm is connected in parallel with the switching bridge arm, and includes a first capacitor C1 and a second capacitor C2, which are connected in series and form a bridge arm midpoint B between the first capacitor C1 and the second capacitor C2. The input inductor Lin is connected between the positive input terminal Vin+ of the power conversion module 1a, the first end of the switching bridge arm, and the first end of the capacitor bridge arm. In addition, the negative input terminal Vin- of the power conversion module 1a is connected to the second end of the switching bridge arm and the second end of the capacitor bridge arm.

[0078] The first magnetic component 2 includes a magnetic core component 20, a primary winding Np1, a first secondary winding Ns1, and a second secondary winding Ns2. The first end of the primary winding Np1 is electrically connected to the midpoint A of the bridge arm, and the second end of the primary winding Np1 is electrically connected to the midpoint B of the bridge arm. The first secondary winding Ns1 and the second secondary winding Ns2 are electromagnetically coupled to the primary winding Np1, and each of the first secondary winding Ns1 and the second secondary winding Ns2 has a first end and a second end. The second end of the first secondary winding Ns1, the first end of the second secondary winding Ns2, and the first end of the primary winding Np1 are terminals of the same name, while the second ends of the first secondary winding Ns1 and the second secondary winding Ns2 are terminals of different names, and are electrically connected to form a center tap. The first secondary rectifier circuit 3 includes a first rectifier component S1, a second rectifier component S2, and an output capacitor Co. The first rectifier component S1 and the second rectifier component S2 may each be composed of at least one rectifier element, such as a metal-oxide-semiconductor field-effect transistor (hereinafter referred to as MOSFET) or a diode. Furthermore, the first rectifier component S1 and the second rectifier component S2 may each be composed of multiple rectifier elements composed of MOSFETs connected in parallel. The first rectifier component S1 and the second rectifier component S2 mentioned below are all exemplarily described as being composed of multiple rectifier elements composed of MOSFETs connected in parallel. Furthermore, the first terminal of the first rectifier component S1 is electrically connected to the first terminal of the second rectifier component S2, wherein the first terminals of the first rectifier component S1 and the first terminals of the second rectifier component S2 are the same electrode, such as the source. The second terminal of the first rectifier component S1, such as the drain, is electrically connected to the first terminal of the first secondary winding Ns1, and the second terminal of the second rectifier component S2, such as the drain, is electrically connected to the first terminal of the second secondary winding Ns2. Therefore, the first rectifier component S1, the second rectifier component S2, the first secondary winding Ns1, and the second secondary winding Ns2 can form a closed loop. The first terminal of the output capacitor Co is electrically connected to the center tap point and forms the positive output terminal Vo+ of the power conversion module 1a. The second terminal of the output capacitor Co is electrically connected to the first terminals of the first rectifier component S1 and the first terminals of the second rectifier component S2 and forms the negative output terminal Vo- of the power conversion module 1a.

[0079] In some embodiments, such as Figure 3 As shown, the drive signal VQ1 received by the first switch Q1 and the drive signal VQ2 received by the second switch Q2 are 180° out of phase, while the duty cycles of the drive signals VQ1 and VQ2 are nearly equal (in Figure 3In this context, symbol D represents the duty cycle of drive signals VQ1 and VQ2. Furthermore, the drive signals VS1 and VQ2 received by the first rectifier component S1 are complementary, and the drive signals VS2 and VQ1 received by the second rectifier component S2 are complementary. The bridging voltage VAB (or the bridging voltage between the midpoint A and midpoint B of the bridge arm) between the first and second terminals of the primary winding Np1 is a three-level alternating voltage, meaning it has three voltage levels: a positive input voltage Vin, 0, and a negative input voltage Vin. In other embodiments, when the duty cycles of drive signals VQ1 and VQ2 are close to or equal to 50%, the bridging voltage VAB becomes a two-level alternating voltage, meaning it has two voltage levels: half the positive input voltage Vin (i.e., +Vin / 2) and half the negative input voltage Vin (i.e., -Vin / 2).

[0080] Of course, in some embodiments, the capacitor bridge arm can be replaced by another switch bridge arm (not shown), making the primary-side switching circuit 1 a full-bridge switching structure, wherein the other switch bridge arm includes another first switch and another second switch. The control method of the two switches in each of the two switch bridge arms is not limited, as long as the bridging voltage VAB can be a two-level or three-level alternating voltage.

[0081] In this embodiment, as Figure 4 and Figure 5 As shown, the magnetic core assembly 20 includes a first magnetic cover 21, a second magnetic cover 22, a first magnetic post 23, a second magnetic post 24, a third magnetic post 25, and a fourth magnetic post 26. The first magnetic post 23 and the third magnetic post 25 are disposed opposite each other between the first magnetic cover 21 and the second magnetic cover 22, and the second magnetic post 24 and the fourth magnetic post 26 are disposed opposite each other between the first magnetic cover 21 and the second magnetic cover 22. The first magnetic post 23 and the third magnetic post 25 are located between the second magnetic post 24 and the fourth magnetic post 26. The magnetic reluctance of the second magnetic post 24 and the fourth magnetic post 26 is greater than that of the first magnetic post 23 and the third magnetic post 25, respectively. The first magnetic post 23, the second magnetic post 24, the third magnetic post 25, and the fourth magnetic post 26 together define a connected region 27. Furthermore, possible variations of the magnetic core assembly will be mentioned later, and since the magnetic core assemblies mentioned later are all similar... Figure 4 The magnetic core assembly 20 shown includes a first magnetic cover and a second magnetic cover, with only variations in the number, position, and winding method of the magnetic pillars. Therefore, the magnetic core assembly shown in the following figures only shows one of the first and second magnetic covers so that the variations in the number, position, and winding method of the magnetic pillars can be clearly displayed.

[0082] In addition, the primary winding Np1 is wound on the first magnetic leg 23 and the third magnetic leg 25 via the communication region 27, and the magnetic flux directions of the first magnetic leg 23 and the third magnetic leg 25 are opposite. The first end of the first secondary winding Ns1 is threaded between the first magnetic leg 23 and the second magnetic leg 24, the second end of the first secondary winding Ns1 is threaded between the third magnetic leg 25 and the fourth magnetic leg 26, the first end of the second secondary winding Ns2 is threaded between the first magnetic leg 23 and the fourth magnetic leg 26, and the second end of the second secondary winding Ns2 is threaded between the second magnetic leg 24 and the third magnetic leg 25.

[0083] As can be seen from the above, since the magnetic resistances of the second magnetic leg 24 and the fourth magnetic leg 26 of the magnetic core assembly 20 of the power conversion module 1a of the embodiment are greater than those of the first magnetic leg 23 and the third magnetic leg 25, respectively, and the primary winding Np1 is wound on the first magnetic leg 23 and the third magnetic leg 25 via the communication region 27, the first end of the first secondary winding Ns1 is threaded between the first magnetic leg 23 and the second magnetic leg 24, the second end of the first secondary winding Ns1 is threaded between the third magnetic leg 25 and the fourth magnetic leg 26, the first end of the second secondary winding Ns2 is threaded between the first magnetic leg 23 and the fourth magnetic leg 26, and the second end of the second secondary winding Ns2 is threaded between the second magnetic leg 24 and the third magnetic leg 25, i.e., the windings are arranged in a cross arrangement, so that the power conversion module 1a has the advantages of small alternating current ripple of the current flowing through the primary winding Np1, the first secondary winding Ns1 and the second secondary winding Ns2 and strong current saturation resistance of the magnetic core.

[0084] In some embodiments, the second magnetic leg 24 and the fourth magnetic leg 26 include air gaps, and the first magnetic leg 23 and the third magnetic leg 25 can not include air gaps, but not limited thereto, in other embodiments, the first magnetic leg 23 and the third magnetic leg 25 can also include air gaps, but the length of the air gap of the second magnetic leg 24 and the length of the air gap of the fourth magnetic leg 26 are greater than the length of the air gap of the first magnetic leg 23 and the length of the air gap of the third magnetic leg 25, respectively. In addition, the air gap of each magnetic leg can be located in the upper region of the corresponding magnetic leg adjacent to the first magnetic cover 21, but not limited thereto, the air gap of each magnetic leg can also be located in the lower region of the corresponding magnetic leg adjacent to the second magnetic cover 22, or the air gap of each magnetic leg can be located in the middle region of the corresponding magnetic leg.

[0085] In some embodiments, the primary winding Np1 is wound alternately on the first magnetic post 23 and the third magnetic post 25 in a figure-eight pattern via the connecting region 27, such that the magnetic flux directions on the first magnetic post 23 and the third magnetic post 25 are opposite. To further explain, the primary winding Np1 enters between the first magnetic post 23 and the fourth magnetic post 26, passes through the connecting region 27, exits between the second magnetic post 24 and the third magnetic post 25, and surrounds the third magnetic post 25. Then, it enters between the third magnetic post 25 and the fourth magnetic post 26, passes through the connecting region 27, and finally exits between the first magnetic post 23 and the second magnetic post 24, and surrounds the first magnetic post 23. Therefore, the first end of the primary winding Np1 is located between the first magnetic post 23 and the fourth magnetic post 26, and the second end of the primary winding Np1 is located between the first magnetic post 23 and the second magnetic post 24. The first and second ends of the primary winding Np1 are located on the same side of the magnetic core assembly 20. Of course, in other embodiments, the winding method of the primary winding Np1 can also be changed to first partially winding the primary winding Np1 onto the first magnetic post 23, and then the remaining part of the primary winding Np1 is wound onto the third magnetic post 25 via the connecting region 27.

[0086] Furthermore, portions of the first secondary winding Ns1 and the second secondary winding Ns2 can be located within the connecting region 27, forming an alternating top-bottom configuration. Additionally, the first ends of the first secondary winding Ns1 and the second secondary winding Ns2 are electrically connected via rectifier components (S1 and S2) on the same side of the core assembly 20 and adjacent to the first magnetic post 23. Moreover, the first ends of the primary winding Np1, the first secondary winding Ns1, and the second secondary winding Ns2 are located on the same side of the magnetic assembly 2.

[0087] For example Figure 2 As shown, the first rectifier component S1 restricts the current direction of the first secondary winding Ns1, and the second rectifier component S2 restricts the current direction of the second secondary winding Ns2, so that the current direction of the current flowing through the first secondary winding Ns1 and the current direction of the current flowing through the second secondary winding Ns2 are the same, both flowing from the first end of the corresponding secondary winding to the second end of the corresponding secondary winding.

[0088] The first rectifier component S1 and the second rectifier component S2 can be switching transistors (such as MOSFETs or IGBTs) or diodes. Figure 5 The diagram below illustrates the structure of a magnetic assembly, with diodes D1 and D2 representing the first rectifier assembly S1 and the second rectifier assembly S2, respectively. The arrows on the first secondary winding Ns1 and the second secondary winding Ns2 indicate the direction of the current, which flows in from the first end of the secondary winding and out from the second end.

[0089] In addition, the first voltage across the first end and the second end of the first secondary winding Ns1 is 180° out of phase with the second voltage across the first end and the second end of the second secondary winding Ns2. The current flowing through the first secondary winding Ns1 and the current flowing through the second secondary winding Ns2 generate alternating magnetic fluxes on the first magnetic leg 23 and the third magnetic leg 25, respectively, wherein the alternating magnetic fluxes on the first magnetic leg 23 and the third magnetic leg 25 are in opposite directions, and the alternating magnetic fluxes on the first magnetic leg 23 and the third magnetic leg 25 are approximately equal, and each of the alternating magnetic fluxes is the phase-difference between the alternating magnetic flux generated by the current flowing through the first secondary winding Ns1 and the alternating magnetic flux generated by the current flowing through the second secondary winding Ns2. Furthermore, the alternating magnetic flux generated by the first secondary winding Ns1 and the alternating magnetic flux generated by the second secondary winding Ns2 are approximately equally distributed to the second magnetic leg 24 and the fourth magnetic leg 26 by phase superposition, and the alternating magnetic fluxes on the second magnetic leg 24 and the fourth magnetic leg 26 are in opposite directions. In addition, the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2 generate direct magnetic fluxes on the first magnetic leg 23, and the direct magnetic fluxes on the first magnetic leg 23 are subtracted, and the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2 generate direct magnetic fluxes on the third magnetic leg 25, and the direct magnetic fluxes on the third magnetic leg 25 are also subtracted. Due to the capacitor bridge arms of the primary side switching circuit 1, the capacitor bridge arms have the function of blocking direct current, so that the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2 are approximately equal by the capacitor bridge arms, so that the direct magnetic fluxes on the first magnetic leg 23 and the third magnetic leg 25 are approximately equal to 0. Furthermore, the direct magnetic fluxes generated by the direct current flowing through the first secondary winding Ns1 and the direct magnetic fluxes generated by the direct current flowing through the second secondary winding Ns2 are in the same direction and are connected in series across the second magnetic leg 24 and the fourth magnetic leg 26, and the air gap of the second magnetic leg 24 and the fourth magnetic leg 26 is used to prevent the saturation of the second magnetic leg 24 and the fourth magnetic leg 26. By using the capacitor bridge arms in the primary side switching circuit 1, the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2 can be approximately equal. In some embodiments, in addition to the first current equalization method relying on the capacitor bridge arms in the primary side switching circuit 1 to achieve the approximate equality of the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2, a second current equalization method, i.e. adding a direct-current blocking capacitor (not shown) connected in series with the primary winding Np1, can also be used to achieve the approximate equality of the direct current flowing through the first secondary winding Ns1 and the direct current flowing through the second secondary winding Ns2.Furthermore, the DC currents flowing through the first secondary winding Ns1 and the second secondary winding Ns2 can also be made approximately equal by a third current equalization means, i.e. by adding a current equalization circuit (not shown). The aforementioned three current equalization means can be applied in the power conversion module la by at least one of them.

[0090] In addition, when the DC currents flowing through the first secondary winding Ns1 and the second secondary winding Ns2 are not completely equal, the unequal DC currents will make the DC magnetic fluxes of the first magnetic column 23 and the third magnetic column 25 not equal to zero, resulting in the first magnetic column 23 and the third magnetic column 25 being easily saturated. Therefore, in other embodiments, air gaps can be provided in the first magnetic column 23 and the third magnetic column 25 respectively to prevent the magnetic fluxes in the first magnetic column 23 and the third magnetic column 25 from being saturated.

[0091] In addition, in the present embodiment, the AC magnetic flux of the first magnetic column 23 is large, but the air gap and the magnetic resistance are small, while the air gap and the magnetic resistance of the second magnetic column 24 are large with respect to the first magnetic column 23, but the AC magnetic flux of the second magnetic column 24 is small, so that the AC current ripple of the first secondary winding Ns1 is small, and the equivalent inductance of the first secondary winding Ns1 is large. Similarly, although the AC magnetic flux of the third magnetic column 25 is large, the air gap and the magnetic resistance are small, while the air gap and the magnetic resistance of the fourth magnetic column 26 are large with respect to the third magnetic column 25, but the AC magnetic flux of the fourth magnetic column 26 is small, so that the AC current ripple of the second secondary winding Ns2 is small, and the equivalent inductance of the second secondary winding Ns2 is large. Correspondingly, the primary winding Np1 coupled with the first secondary winding Ns1 and the second secondary winding Ns2 also has the benefit of reduced current ripple, and the current ripple of the switching bridge arm current flowing through the primary side switching circuit 1 is also reduced, thereby reducing the switching loss. Therefore, the magnetic assembly of the power conversion module la of the present application has the advantages of small AC current ripple and strong current saturation resistance of the magnetic core.

[0092] In addition, the material of the entire magnetic core assembly 20 can be the same, such as ferrite material or iron powder material, for the configuration of the magnetic core assembly 20. In other embodiments, the configuration material of the first magnetic leg 23 and the third magnetic leg 25 is different from the configuration material of the remaining part of the magnetic core assembly 20, for example, the configuration material of the first magnetic leg 23 and the third magnetic leg 25 is ferrite material, and the configuration material of the remaining part of the magnetic core assembly 20 is iron powder material with distributed air gap, so that the magnetic core loss of the magnetic core assembly 20 is low, and the equivalent inductance of the first secondary winding Ns1 and the second secondary winding Ns2 is large. In some embodiments, the sum of the cross-sectional areas of the second magnetic leg 24 and the fourth magnetic leg 26 is greater than the sum of the cross-sectional areas of the first magnetic leg 23 and the third magnetic leg 25. Furthermore, the cross-sectional area of the second magnetic leg 24 is approximately equal to the cross-sectional area of the fourth magnetic leg 26, with an error within ±20%; the cross-sectional area of the first magnetic leg 23 is approximately equal to the cross-sectional area of the third magnetic leg 25, with an error within ±20%, wherein the error within ±20% means that the difference between the cross-sectional areas of the two magnetic legs is within ±20% of the cross-sectional area of one of the two magnetic legs.

[0093] For the three-dimensional structure of the power conversion module 1a, please refer to Figure 1A 、 Figure 1B In this embodiment, the power conversion module 1a further includes a printed circuit board 4 and a first positive output terminal pin To1+. The printed circuit board 4 can be, but is not limited to, a multi-layer structure. The primary side switching circuit 1, the first secondary side rectifying circuit 3, the first magnetic assembly 2, and the first positive output terminal pin To1+ can constitute a basic power unit, which is arranged on the printed circuit board 4. The power conversion module 1a can perform power conversion through at least one basic power unit to output electric energy, wherein the primary side switching circuit 1, the first secondary side rectifying circuit 3, the first magnetic assembly 2, and the first positive output terminal pin To1+ are sequentially arranged along a direction of the printed circuit board 4, for example, along the X-axis direction as shown in Figure 1A The first positive output terminal pin To1+ corresponds to the positive output terminal Vo+ in FIG. 2, and the first positive output terminal pin To1+ can be formed of a conductive body, such as a copper block.

[0094] As described above, since the primary side switching circuit 1, the first secondary side rectifying circuit 3, the first magnetic assembly 2, and the first positive output terminal pin To1+ are sequentially arranged along the X-axis direction of the printed circuit board 4, the width of the power conversion module 1a in the Y-axis direction perpendicular to the X-axis direction can be reduced, and the expansion of the power conversion module 1a in output current or output power is facilitated, so that the size structure of the power conversion module 1a is suitable for rectangular small-size and high-density electronic devices, such as display cards or ASIC cards, thereby making the power conversion module 1a have the advantages of small size and high power density.

[0095] In some embodiments, such as Figure 1A As shown, the primary-side switching circuit 1 is located on one side of the printed circuit board 4. The first switch Q1 and the second switch Q2 of the switching bridge arm of the primary-side switching circuit 1 are disposed on the first surface 40 of the printed circuit board 4, and the first capacitor C1 and the second capacitor C2 of the capacitor bridge arm of the primary-side switching circuit 1 are disposed on the second surface 41 of the printed circuit board 4 opposite to the first surface 40. The positions of the switching bridge arm and the capacitor bridge arm on the printed circuit board 4 correspond. Furthermore, the primary-side switching circuit 1 may also include a driver 10, which is used to drive the actuation of the first switch Q1 and the second switch Q2 of the switching bridge arm. The driver 10 is disposed along the Y-axis on one side of the first switch Q1 and the second switch Q2 of the switching bridge arm, for example... Figure 1A The first switch Q1 and the second switch Q2 are shown above each other. The first positive output pin To1+ can be located on the first side 40 and / or the second side 41 of the printed circuit board 4.

[0096] In other embodiments, the first rectifier assembly S1 and the second rectifier assembly S2 may each be composed of multiple MOSFETs connected in parallel. For example, the first rectifier assembly S1 may be composed of a first rectifier element S11 and a second rectifier element S12 connected in parallel, and the second rectifier assembly S2 may be composed of a first rectifier element S21 and a second rectifier element S22 connected in parallel. The first rectifier element S11 of the first rectifier assembly S1 and the first rectifier element S21 of the second rectifier assembly S2 are disposed on the first surface 4 of the printed circuit board 4. On the first rectifier assembly S1, the second rectifier element S12 and the second rectifier element S22 are disposed on the second surface 41 of the printed circuit board 4. The positions of the first rectifier element S11 and the second rectifier element S12 on the printed circuit board 4 are corresponding, for example, mirror symmetrical to the first surface 40 and the second surface 41 of the printed circuit board 4. The positions of the first rectifier element S21 and the second rectifier element S22 on the printed circuit board 4 are corresponding, for example, mirror symmetrical to the first surface 40 and the second surface 41 of the printed circuit board 4.

[0097] Furthermore, the first magnetic cover 21 and the second magnetic cover 22 of the magnetic core assembly 20 are fastened to the printed circuit board 4 from the first side 40 and the second side 41 of the printed circuit board 4, respectively, and the first magnetic post 23, the second magnetic post 24, the third magnetic post 25 and the fourth magnetic post 26 are respectively inserted through the corresponding through holes (not shown) of the printed circuit board 4 and are at least partially housed in the printed circuit board 4.

[0098] Furthermore, the printed circuit board 4 is a multilayer circuit board, with the primary winding Np1, the first secondary winding Ns1, and the second secondary winding Ns2 sequentially embedded in different layers of the printed circuit board 4, and staggered in the different layers. The second end of the first secondary winding Ns1 and the second end of the second secondary winding Ns2 are electrically connected to the first positive output terminal pin To1+ located on the second surface 41 of the printed circuit board 4.

[0099] In some embodiments, the power conversion module 1a further includes multiple input pins Tin, multiple negative output pins To-, and multiple signal control and detection pins Ts. The multiple input pins Tin, To-, and Ts can be made of conductive materials, such as copper, and are respectively disposed on the second surface 41 of the printed circuit board 4, for example, on two opposite side regions of the second surface 41 along the Y-axis. The multiple negative output pins To- are respectively adjacent to the first rectifier component S1 and the second rectifier component S2 of the first secondary rectifier circuit 3, and the signal control and detection pins Ts are adjacent to the first capacitor C1 and the second capacitor C2 of the capacitor bridge arm. Each input pin Tin is located between the corresponding negative output pin To- and the signal control and detection pin Ts.

[0100] Furthermore, in other embodiments, the tops of the first switch Q1, the second switch Q2, the first rectifier element S11 of the first rectifier assembly S1, the second rectifier element S21 of the second rectifier assembly S2, and the first magnetic cover 21 of the magnetic core assembly 20 on the first surface 40 of the printed circuit board 4 can be located on the same horizontal plane. This allows the power conversion module 1a to easily install heat dissipation devices, such as thermally conductive materials and / or heat dissipation substrates, at the tops of the first rectifier element S11 of the first rectifier assembly S1, the second rectifier element S21 of the second rectifier assembly S2, and the first magnetic cover 21 of the magnetic core assembly 20. This minimizes the thermal resistance between the first rectifier assembly S1, the second rectifier assembly S2, and the magnetic core assembly 20 and the heat dissipation device, thereby achieving side heat dissipation of the power conversion module 1a.

[0101] Figure 6A , Figure 6B These are three-dimensional structural diagrams of the power conversion module of the second preferred embodiment of the present invention from different perspectives. Figure 7 for Figure 6A The circuit topology diagram corresponding to the power conversion module shown is as follows: Figure 8 for Figure 6A The diagram shows the structure of the two magnetic components after the first magnetic cover has been removed. The circuit topology of the single-stage power conversion formed by the power conversion module 1b in this embodiment can be similar to... Figure 7 As shown, compared toFigure 2 As shown in the power conversion module 1a, the power conversion module 1b of the present embodiment further comprises a second magnetic assembly 2a and a second secondary side rectifier circuit 3a, wherein the structure of the second magnetic assembly 2a is similar to that of the first magnetic assembly 2, and the structure of the second secondary side rectifier circuit 3a is similar to that of the first secondary side rectifier circuit 3, so here the same symbols are used to represent the similar structure and function of the elements. In addition, the primary side winding Np1 of the first magnetic assembly 2 and the primary side winding Np1 of the second magnetic assembly 2a are electrically connected in series between the bridge arm midpoint A and the bridge arm midpoint B, that is, the first end of the primary side winding Np1 of the first magnetic assembly 2 is electrically connected to the bridge arm midpoint A, the second end of the primary side winding Np1 of the first magnetic assembly 2 is electrically connected to the first end of the primary side winding Np1 of the second magnetic assembly 2a, and the second end of the primary side winding Np1 of the second magnetic assembly 2a is electrically connected to the bridge arm midpoint B.

[0102] The electrical connection mode between the second secondary side rectifier circuit 3a and the second magnetic assembly 2a is similar to that between the first secondary side rectifier circuit 3 and the first magnetic assembly 2, which will not be described here. In addition, the second end of the first secondary side winding Ns1 and the second end of the second secondary side winding Ns2 of the second secondary side rectifier circuit 3a are opposite ends and are electrically connected to each other and form a center tap point, which is electrically connected to the first end of the output capacitor Co, and the first end of the first rectifier assembly S1 and the first end of the second rectifier assembly S2 of the second secondary side rectifier circuit 3a are electrically connected to the second end of the output capacitor Co. In addition, the driving signal of the first rectifier assembly S1 of the first secondary side rectifier circuit 3 and the driving signal of the first rectifier assembly S1 of the second secondary side rectifier circuit 3a have the same phase, and the driving signal of the second rectifier assembly S2 of the first secondary side rectifier circuit 3 and the driving signal of the second rectifier assembly S2 of the second secondary side rectifier circuit 3a have the same phase.

[0103] Compared with Figure 2 As shown in the circuit topology composed of the power conversion module 1a, the power conversion module 1b of the present embodiment uses one primary side switching circuit 1, two magnetic assemblies 2, 2a and two secondary side rectifier circuits 3, 3a, so it not only doubles the output current and output power, but also has the advantages of fewer components of the primary side switching circuit 1 and smaller size of the primary side switching circuit 1. In addition, since the primary side windings Np1 of the two magnetic assemblies 3, 3a are electrically connected in series, the number of turns of the primary side winding Np1 of each magnetic assembly can be reduced from N turns to 0.5*N turns, so that the number of electrical isolation gaps between different turns of the primary side winding Np1 of each magnetic assembly is halved, greatly improving the copper filling rate of the position of the primary side winding Np1 of each magnetic assembly and reducing the conduction resistance of the primary side winding Np1 of each magnetic assembly.

[0104] In addition, asFigure 8 As shown, the primary winding Np1, the first secondary winding Ns1, and the second secondary winding Ns2 of the second magnetic component 2a are wound around the first magnetic post 23 and the second magnetic post 25 of the second magnetic component 2a in a similar manner to the winding of the primary winding Np1, the first secondary winding Ns1, and the second secondary winding Ns2 of the first magnetic component 2a around the first magnetic post 23 and the second magnetic post 25 of the first magnetic component 2a. That is, the primary winding Np1 of the second magnetic component 2a is wound around the first magnetic post 23 and the third magnetic post 25 of the second magnetic component 2a through the connecting region 27 of the second magnetic component 2a, and the magnetic flux directions on the first magnetic post 23 and the third magnetic post 25 of the second magnetic component 2a are opposite. The first end of the first secondary winding Ns1 of the second magnetic component 2a passes between the first magnetic post 23 and the second magnetic post 24. The second end of the first secondary winding Ns1 of the second magnetic component 2a passes between the third magnetic post 25 and the fourth magnetic post 26 and is electrically connected to the first end of the output capacitor Co. The first end of the second secondary winding Ns2 of the second magnetic component 2a passes between the first magnetic post 23 and the fourth magnetic post 26. The second end of the second secondary winding Ns2 of the second magnetic component 2a passes between the second magnetic post 24 and the third magnetic post 25 and is electrically connected to the first end of the output capacitor Co.

[0105] Furthermore, the primary winding Np1 of the first magnetic component 2 and the primary winding Np1 of the second magnetic component 2a are connected in series. The bridging voltage VAB (or the bridging voltage between the midpoint A and the midpoint B of the bridge arm) between the primary winding Np1 of the first magnetic component 2 and the primary winding Np1 of the second magnetic component 2a can be a three-level alternating voltage, that is, the bridging voltage VAB has three voltage levels: positive input voltage Vin, 0, and negative input voltage Vin. Of course, the bridging voltage VAB can also be a two-level alternating voltage, that is, the bridging voltage VAB has two voltage levels: half of the positive input voltage Vin (i.e., +Vin / 2) and half of the negative input voltage Vin (i.e., -Vin / 2).

[0106] For the three-dimensional structure of power conversion module 1b, please refer to [link / reference]. Figure 6A , Figure 6B In this embodiment, the power conversion module 1b is compared to... Figure 1A , Figure 1B The power conversion module 1a shown also includes a second magnetic component 2a, a second secondary-side rectifier circuit 3a, and a second positive output terminal To2+, wherein the second positive output terminal To2+, the second magnetic component 2a, the second secondary-side rectifier circuit 3a, the primary-side switching circuit 1, the first secondary-side rectifier circuit 3, the first magnetic component 2, and the first positive output terminal To1+ are along one direction of the printed circuit board 4, for example along... Figure 6AThe X-axis directions shown are arranged in sequence. The second positive output pin To2+ corresponds to... Figure 7 The positive output terminal Vo+ and the second positive output terminal To2+ can be made of a conductor, such as a copper block, and can be disposed on the first side 40 and / or the second side 41 of the printed circuit board 4.

[0107] like Figure 6A As shown, the primary-side switching circuit 1 is located in the middle area of ​​the printed circuit board 4. Furthermore, in other embodiments, the first rectifier component S1 and the second rectifier component S2 of the second secondary-side rectifier circuit 3a can each be composed of multiple MOSFETs connected in parallel. For example, the first rectifier component S1 is composed of a first rectifier element S11 and a second rectifier element S12 connected in parallel, and the second rectifier component S2... It is composed of a first rectifier element S21 and a second rectifier element S22 connected in parallel. The first rectifier element S11 of the first rectifier component S1 and the first rectifier element S21 of the second rectifier component S2 of the second secondary rectifier circuit 3a are disposed on the first surface 40 of the printed circuit board 4. The second rectifier element S12 of the first rectifier component S1 and the second rectifier element S22 of the second rectifier component S2 of the second secondary rectifier circuit 3a are disposed on the second surface 41 of the printed circuit board 4. The positions of the first rectifier element S11 and the second rectifier element S12 of the second secondary rectifier circuit 3a on the printed circuit board 4 are corresponding, and the positions of the first rectifier element S21 and the second rectifier element S22 of the second secondary rectifier circuit 3a on the printed circuit board 4 are corresponding, for example, mirror-symmetrical to the first surface 40 and the second surface 41 of the printed circuit board 4.

[0108] Furthermore, the primary-side switching circuit 1 may include a driver 10, which is used to drive the operation of the first switch Q1 and the second switch Q2 of the switching bridge arm. The driver 10 is disposed on one side of the first switch Q1 and the second switch Q2 of the switching bridge arm along the Y-axis direction, for example... Figure 6A The upper side of the first switch Q1 and the second switch Q2 shown.

[0109] Furthermore, the first magnetic cover 21 and the second magnetic cover 22 of the second magnetic component 2a are respectively fastened to the printed circuit board 4 from the first surface 40 and the second surface 41 of the printed circuit board 4, and the first magnetic post 23, the second magnetic post 24, the third magnetic post 25 and the fourth magnetic post 26 of the second magnetic component 2a are respectively inserted through corresponding through holes (not shown) in the printed circuit board 4 and are at least partially housed within the printed circuit board 4. The second end of the first secondary winding Ns1 and the second end of the second secondary winding Ns2 of the magnetic component 2a are electrically connected to the second positive output terminal pin To2+ located on the second surface 41.

[0110] Further, in other embodiments, part of the negative output pins To- of the plurality of negative output pins To- are disposed adjacent to the first rectifying component S1 and the second rectifying component S2 of the second secondary rectifying circuit 3a, and part of the signal control and detection signal pins Ts of the plurality of signal control and detection signal pins Ts are disposed adjacent to the first capacitor C1 and the second capacitor C2 of the capacitor bridge arm. Each input pin Tin is then located between the corresponding negative output pin To- and the signal control and detection signal pin Ts.

[0111] Figure 9 A schematic view of the structure of another variation of the magnetic assembly of the present application after removing the first magnetic cover. Of course, the structures of the first magnetic assembly and the second magnetic assembly used by the power conversion module of the present application are not limited to the embodiments shown in Figure 4 、 Figure 5 . In some embodiments, the first magnetic assembly and the second magnetic assembly used by the power conversion module shown in FIG. 6A can also be replaced by a third magnetic assembly 2b shown in Figure 1A 、 Figure 9 , respectively, where the third magnetic assembly 2b comprises a magnetic core assembly, a primary winding Np1, a first secondary winding Ns1, and a second secondary winding Ns2. The magnetic core assembly comprises a first magnetic cover (not shown), a second magnetic cover 22a, a first magnetic column 23a, a second magnetic column 24a, and a third magnetic column 25a. The first magnetic column 23a, the second magnetic column 24a, and the third magnetic column 25a are located between the first magnetic cover and the second magnetic cover 22a, where the first magnetic column 23a and the third magnetic column 25a are oppositely disposed, and the second magnetic column 24a is located between the first magnetic column 23a and the third magnetic column 25a. In some embodiments, the first magnetic column 23a and the third magnetic column 25a comprise an air gap, and the second magnetic column 24a can not comprise an air gap, but not limited thereto, in other embodiments, the second magnetic column 24a can also comprise an air gap.

[0112] The primary winding Np1, the first secondary winding Ns1, and the second secondary winding Ns2 of the third magnetic assembly 2b are sequentially built-in different layers of a printed circuit board 4, such as shown in Figure 1A or Figure 6A , and present an up-down staggered state in different layers. In addition, the first secondary winding Ns1 is threaded between the first magnetic column 23a and the second magnetic column 24a, and the second secondary winding Ns2 is threaded between the second magnetic column 24a and the third magnetic column 25a. The first end of the first secondary winding Ns1 is electrically connected to the second end of the first rectifying component S1, as shown in Figure 2 , and the first end of the second secondary winding Ns2 is electrically connected to the second end of the second rectifying component S2, as shown in Figure 2The second end of the second rectifying component S2 is electrically connected to the second end of the first secondary winding Ns1 and the second end of the second secondary winding Ns2, and forms a center tap point, which is electrically connected to the first end of the output capacitor Co. The first rectifying component S1 limits the current direction of the first secondary winding Ns1, and the second rectifying component S2 limits the current direction of the second secondary winding Ns2, so that the current direction of the current flowing through the first secondary winding Ns1 and the current direction of the current flowing through the second secondary winding Ns2 are the same, both from the first end of the corresponding secondary winding to the second end of the corresponding secondary winding. In Figure 9 the structure diagram of the magnetic component is illustrated by taking the first rectifying component S1 and the second rectifying component S2 as examples represented by diodes D1 and D2 respectively.

[0113] The first end of the primary winding Np1 of the third magnetic component 2b is electrically connected to the bridge arm center point A of the switch bridge arm as Figure 2 shown, and passes through between the first magnetic column 23a and the second magnetic column 24a, so that the primary winding Np1 surrounds the second magnetic column 24a. The second end of the primary winding Np1 passes through between the second magnetic column 24a and the third magnetic column 25a, and is electrically connected to the bridge arm center point B of the capacitor bridge arm as Figure 2 shown. In addition, the voltage VAB across the first end and the second end of the primary winding Np1 (or the voltage across the bridge arm center point A and the bridge arm center point B) is a three-level alternating voltage, that is, the voltage VAB has three voltage levels of the positive input voltage Vin, 0 and the negative input voltage Vin. In other embodiments, when the drive signals of the two switches of the bridge circuit of the primary side switch circuit 1 and the conduction duty cycle of the drive signals are close to or equal to 50%, the voltage VAB is a two-level alternating voltage, that is, the voltage VAB has two voltage levels of half of the positive input voltage Vin (i.e. +Vin / 2) and half of the negative input voltage Vin (i.e. -Vin / 2). In addition, the second end of the first secondary winding Ns1, the first end of the second secondary winding Ns2 and the first end of the primary winding Np1 are the same name ends.

[0114] In addition, the first voltage across the first end and the second end of the first secondary winding Ns1 of the third magnetic assembly 2b is 180° out of phase with the second voltage across the first end and the second end of the second secondary winding Ns2. The AC flux generated by the first secondary winding Ns1 is applied to the first magnetic leg 23a, the AC flux generated by the second secondary winding Ns2 is applied to the third magnetic leg 25a, and the AC flux generated by the first secondary winding Ns1 and the AC flux generated by the second secondary winding Ns2 are subtracted in phase and applied to the second magnetic leg 24a. In addition, the DC component (hereinafter referred to as DC current) of the current flowing through the first secondary winding Ns1 is subtracted from the DC flux generated by the DC component (hereinafter referred to as DC current) of the current flowing through the second secondary winding Ns2 and the DC flux generated by the DC component (hereinafter referred to as DC current) of the current flowing through the first secondary winding Ns1 at the second magnetic leg 24a, and the DC magnetic pressure generated by the DC current flowing through the first secondary winding Ns1 and the DC magnetic pressure generated by the DC current flowing through the second secondary winding Ns2 are in series in the same direction and are applied across the first magnetic leg 23a and the third magnetic leg 25a, and the air gap of the first magnetic leg 23a and the third magnetic leg 25a is used to resist the series DC magnetic pressure to prevent the first magnetic leg 23a and the third magnetic leg 25a from saturating.

[0115] In comparison with the first magnetic assembly 2 shown in Figure 5 In comparison with the first magnetic assembly 2 shown in Figure 9 The AC flux of the first magnetic leg 23a of the third magnetic assembly 2b shown in is large, and the air gap is large and the magnetic resistance is large, so that the AC current ripple of the first secondary winding Ns1 is large, and the equivalent inductance of the first secondary winding Ns1 is small. Similarly, the AC flux of the third magnetic leg 25a is large, and the air gap is large and the magnetic resistance is large, so that the AC current ripple of the first secondary winding Ns1 is large, and the equivalent inductance of the first secondary winding Ns1 is small. Correspondingly, the current ripple of the primary winding Np1 coupled with the first secondary winding Ns1 and the second secondary winding Ns2 is also large, but regardless of whether the first secondary winding Ns1 or the second secondary winding Ns2 of the third magnetic assembly 2b shown in Figure 9 The path of the secondary winding is short, the equivalent parasitic resistance is small, and the conduction loss is small, so it is suitable for occasions with large current output.

[0116] In addition, for the third magnetic assembly 2b shown in Figure 8The material of the entire magnetic core assembly can be the same, such as ferrite material or iron powder material. In other embodiments, the material of the first magnetic column 23a and the third magnetic column 25a is different from the material of the rest of the magnetic core assembly 20, for example, the material of the first magnetic column 23a and the third magnetic column 25a is ferrite material, and the material of the rest of the magnetic core assembly is iron powder material with distributed air gaps, so that the magnetic core loss of the magnetic core assembly 20 is low, and the equivalent inductance of the first secondary winding Ns1 and the second secondary winding Ns2 is large.

[0117] Figure 10A 、 Figure 10B A perspective view of a power conversion module according to a third preferred embodiment of the present application, Figure 10C A perspective view of a power conversion module according to a third preferred embodiment of the present application, Figure 10A An exploded view of a power conversion module according to a third preferred embodiment of the present application, Figure 11 An exploded view of a power conversion module according to a third preferred embodiment of the present application, Figure 10A A perspective view of a first magnetic assembly according to a third preferred embodiment of the present application. As shown, the power conversion module 1c according to the present embodiment is different from the power conversion module 1b according to the second preferred embodiment of the present application in that the structure of the first magnetic assembly 2 and the second magnetic assembly 2a used in the present embodiment are respectively the same as the structure of the third magnetic assembly 2b shown in Figure 6A A perspective view of a first magnetic assembly according to a third preferred embodiment of the present application. As shown, the power conversion module 1c according to the present embodiment is different from the power conversion module 1b according to the second preferred embodiment of the present application in that the structure of the first magnetic assembly 2 and the second magnetic assembly 2a used in the present embodiment are respectively the same as the structure of the third magnetic assembly 2b shown in Figure 9 A perspective view of a first magnetic assembly according to a third preferred embodiment of the present application. As shown, the power conversion module 1c according to the present embodiment is different from the power conversion module 1b according to the second preferred embodiment of the present application in that the structure of the first magnetic assembly 2 and the second magnetic assembly 2a used in the present embodiment are respectively the same as the structure of the third magnetic assembly 2b shown in

[0118] In the above embodiments, the first positive output terminal pin To1+ and the second positive output terminal pin To2+ can be respectively disposed on the side wall of the second magnetic cover 22 of the first magnetic assembly 2 and the second magnetic assembly 2a and on the two surfaces adjacent to the side wall by electroplating, so as to increase the current conducting capacity of the positive output terminal Vo+. However, this is not a limitation, and the first positive output terminal pin To1+ and the second positive output terminal pin To2+ can also be respectively disposed on the side wall of the second magnetic cover 22 of the first magnetic assembly 2 and the second magnetic assembly 2a and on the two surfaces adjacent to the side wall by inlaying, or by other methods. Figure 11The first positive output pin To1+ can also be plated on the side wall of the second magnetic cover 22 and the two surfaces adjacent to the side wall, and the second positive output pin To2+ of the second magnetic assembly 2a can also be plated on the side wall of the second magnetic cover and the two surfaces adjacent to the side wall.

[0119] Figure 12 The circuit topology corresponding to the power conversion module of the fourth preferred embodiment of the present application, Figure 13 The circuit topology corresponding to the power conversion module of the fourth preferred embodiment of the present application, Figure 12 The structure of the magnetic assembly of the power conversion module shown in FIG. 1a after the first magnetic cover is removed. In some embodiments, the first positive output pin To1+ can also be plated on the side wall of the second magnetic cover 22 and the two surfaces adjacent to the side wall, and the second positive output pin To2+ of the second magnetic assembly 2a can also be plated on the side wall of the second magnetic cover and the two surfaces adjacent to the side wall. Figure 2 The circuit topology corresponding to the power conversion module 1a shown in FIG. 1a can further include an additional winding Na, i.e. to form a power conversion module 1d shown in FIG. 1d. Figure 12 The power conversion module 1d shown in FIG. 1d, wherein the magnetic assembly 2c used by the power conversion module 1d can be a third magnetic assembly 2b shown in FIG. 2b. Figure 9 The structure of the third magnetic assembly 2b shown in FIG. 2b, so the same symbol is used to represent the similar structure and function of the elements, and the magnetic assembly 2c further includes an additional winding Na, which is electromagnetically coupled with the primary winding Np1, and the additional winding Na is further electrically connected with an additional inductance La, wherein the additional winding Na is alternately wound on the first magnetic column 23a and the third magnetic column 25a in the form of ∞, and the amplitude of the alternating voltage coupled out of the additional winding Na on the first magnetic column 23a and the alternating voltage coupled out of the additional winding Na on the second magnetic column 24a are approximately equal in amplitude and 180° out of phase. Furthermore, since the additional winding Na is alternately wound on the first magnetic column 23a and the third magnetic column 25a in the form of ∞, the voltage amplitude on the additional winding Na is reduced and the frequency is doubled. When the duty cycle of the alternating voltage coupled out of the additional winding Na on the first magnetic column 23a and the alternating voltage coupled out of the additional winding Na on the third magnetic column 25a is close to 50%, the additional winding Na is alternately wound on the first magnetic column 23a and the third magnetic column 25a in the form of ∞, so that the duty cycle of the alternating voltage on the additional winding Na is close to 100%, and thus the alternating voltage is applied to the additional inductance La, which makes the ripple current of the additional inductance La small.

[0120] When the load driven by the power conversion module 1d jumps from heavy load to light load, the output voltage Vo of the power conversion module 1d will overshoot, so that the controller (not shown) responds, so that the driving signals of the first switch Q1 and the second switch Q2 of the switch bridge arm of the primary side switch circuit 1 disappear, and the first rectifier element S1 and the second rectifier element S2 of the first secondary side rectifier circuit 3 are always on, so that the first secondary side winding Ns1 and the second secondary side winding Ns2 both bear the output voltage Vo, and because the additional winding Na is provided, the alternating voltage coupled out by the additional winding Na on the first magnetic column 23a is proportional to the output voltage Vo, and the alternating voltage coupled out by the additional winding Na on the second magnetic column 24a is proportional to the output voltage Vo, so that the alternating voltage coupled out by the additional winding Na on the first magnetic column 23a and the alternating voltage coupled out by the additional winding Na on the second magnetic column 24a are superimposed in magnitude and applied to the additional inductor La, causing the current of the additional inductor La to increase greatly, thereby greatly reducing the current of the first secondary side winding Ns1 and the second secondary side winding Ns2, thereby greatly suppressing the overshoot of the output voltage Vo.

[0121] Of course, the aforementioned technology of using the additional winding Na to achieve dynamic overshoot suppression can also be applied to a power conversion module containing multiple parallel electrically connected basic power units. Figure 14 The circuit topology schematic diagram corresponding to the power conversion module of the fifth preferred embodiment of the present application is shown in Figure 15 For Figure 14 The structure schematic diagram after removing the first magnetic cover from the two magnetic assemblies shown in Figure 2 The single-stage electric energy conversion circuit topology formed by the power conversion module 1e of the present embodiment can be similar to Figure 2 The power conversion module 1a shown in Figure 14 The power conversion module 1e shown in also contains two basic power units, namely a first basic power unit and a second basic power unit, the input end of the first basic power unit and the input end of the second basic power unit are electrically connected in parallel, and the output end of the first basic power unit and the output end of the second basic power unit are electrically connected in parallel, wherein the first basic power unit contains the primary side switch circuit 1, the first magnetic assembly 2, and the first secondary side rectifier circuit 3, and the primary side switch circuit 1, the first magnetic assembly 2, and the first secondary side rectifier circuit 3 are electrically connected in parallel with Figure 2The primary side switch circuit 1, the first magnetic assembly 2 and the first secondary side rectifier circuit 3 shown are identical in circuit structure and operation, and will not be described again. The second basic power unit includes a primary side switch circuit la, a first magnetic assembly 2a and a first secondary side rectifier circuit 3a, wherein the circuit structure and operation of the primary side switch circuit la, the first magnetic assembly 2a and the first secondary side rectifier circuit 3a are similar to those of the primary side switch circuit 1, the first magnetic assembly 2 and the first secondary side rectifier circuit 3 of the first basic power unit, and therefore the same symbols are used to represent the similar structure and function of the elements. In addition, in the present embodiment, the positive output terminal pin To1+, the first magnetic assembly 2a, the first secondary side rectifier circuit 3a, the primary side switch circuit la, the primary side switch circuit 1, the first secondary side rectifier circuit 3, the first magnetic assembly 2 and the first positive output terminal pin To1+ are arranged in the same direction along the printed circuit board 4.

[0122] Furthermore, in the first basic power unit, an additional winding Na1 is further included, and in the second basic power unit, an additional winding Na2 is further included, as shown in Figure 15 As shown, one end of the plurality of additional windings is threaded between the first magnetic column 23 and the fourth magnetic column 26 of the magnetic assembly 2 of the first basic power unit, passes through between the third magnetic column 25 and the fourth magnetic column 26, is threaded between the first magnetic column 23 and the fourth magnetic column 26 of the magnetic assembly 2a, is threaded out between the third magnetic column 25 and the fourth magnetic column 26, winds around the two fourth magnetic columns 26 outside the magnetic assembly 2a and the magnetic assembly 2, forms part of the additional winding Na1 and part of the additional winding Na2, and is connected in series to form a series branch; then it is threaded between the first magnetic column 23 and the second magnetic column 24 of the magnetic assembly 2, passes through between the third magnetic column 25 and the second magnetic column 24, is then threaded between the first magnetic column 23 and the second magnetic column 25 of the magnetic assembly 2a, is threaded out between the third magnetic column 25 and the second magnetic column 24, winds around the two second magnetic columns 24 outside the magnetic assembly 2a and the magnetic assembly 2, forms part of the additional winding Na1 and part of the additional winding Na2, and is connected in series to form another series branch; the two series branches are connected in parallel at the same polarity end points and are connected in series with the additional inductor La to form a closed loop. In the present embodiment, the additional windings Na1 and Na2 are wound in a B-shaped manner on the second magnetic column 24 and the fourth magnetic column 26, respectively, and are connected in parallel and in series with the additional inductor La to form a closed loop. In this embodiment, the alternating voltage coupled by the additional windings Na1 and Na2 is applied to the additional inductor La, so that the ripple current of the additional inductor La is small.

[0123] In another embodiment, in the first basic power unit, an additional winding Na1 is further included, and in the second basic power unit, an additional winding Na2 is further included, as shown in Figure 16As shown, one end of multiple additional windings passes through the space between the first magnetic post 23 and the fourth magnetic post 26 of the magnetic component 2 of the first basic power unit, passes between the third magnetic post 25 and the fourth magnetic post 26, enters between the first magnetic post 23 and the fourth magnetic post 26 of the magnetic component 2a, exits between the third magnetic post 25 and the fourth magnetic post 26, and winds around two fourth magnetic posts 26 along the outside of the magnetic component 2a and the magnetic component 2, forming a partial additional winding Na1 and a partial additional winding Na2, which are connected in series to form a series branch; then, it passes around the outside of the second magnetic post 24 of the magnetic component 2 and the magnetic component 2a, enters between the second magnetic post 24 and the third magnetic post 25 of the magnetic component 2a, passes between the first magnetic post 23 and the second magnetic post 24, and then enters from the second magnetic post 24 of the magnetic component 2. The additional winding Na1 passes between the first magnetic post 23 and the second magnetic post 24, and exits between the third magnetic post 25 and the first magnetic post 23, forming a partial additional winding Na2, which are connected in series to form another series branch. The two ends of these two series branches with different polarities are connected in series and then connected in series with the additional inductor La to form a closed loop. In this embodiment, the additional winding Na is wound in an ∞ shape around the second magnetic post 24 and the fourth magnetic post 26, and after being connected in series, it forms a closed loop with the additional inductor La. In this embodiment, the AC voltage coupled from the additional winding can also be applied to the additional inductor La, resulting in a small ripple current in the additional inductor La. Compared to Figure 15 In the embodiment shown, the voltages across the additional windings Na1 and Na2 are superimposed, causing the voltage across the additional inductor La to double. This halves the current flowing through the additional inductor La, resulting in a reduction in the parasitic conduction losses in the series circuit of the additional windings Na1, Na2, and the additional inductor La.

[0124] The figure-eight and figure-B winding methods of the above-mentioned additional windings can also be applied to a single power conversion unit, and additional windings Na can be obtained to achieve the benefit of dynamic overshoot suppression.

[0125] In some embodiments, the drive signals received by the switching bridge arm of the primary-side switching circuit 1 of the first basic power unit and the switching bridge arm of the primary-side switching circuit 1a of the second power conversion unit are out of phase by 90°. That is, the voltage VAB between the midpoints A and B of the bridge arms of the primary-side switching circuit 1 of the first basic power unit and the capacitor bridge arm is out of phase by 90°.

[0126] In the above embodiments, the two magnetic components 2 and 2a used in the power conversion module 1e can be respectively Figure 5The structure of the magnetic assembly 2 shown comprises four magnetic columns, and therefore the same reference signs are used to represent the similar structure and function of the elements. The additional winding Na1 of the first basic power unit is coupled to the second magnetic column 24 and the fourth magnetic column 26 of the magnetic assembly 2, thereby generating a 4 times frequency signal. The additional winding Na2 of the second basic power unit is coupled to the second magnetic column 24 and the fourth magnetic column 26 of the magnetic assembly 2a, thereby generating a same 4 times frequency signal. When the duty ratio of the driving signal of the switch bridge arm of the primary side switching circuit 1 is 25%, the duty ratio of the alternating voltage on the additional winding Na1 is close to 100%, and when the duty ratio of the driving signal of the switch bridge arm of the primary side switching circuit la is 25%, the duty ratio of the alternating voltage on the additional winding Na2 is close to 100%. The alternating voltage on the additional windings Na1 and Na2 is applied to the additional inductor La, so that the ripple current of the additional inductor La is small.

[0127] When the load driven by the power conversion module ld changes from heavy load to light load, the output voltage Vo of the power conversion module ld will overshoot, so that the controller (not shown) responds, so that the driving signals of the first switch Q1 and the second switch Q2 of the switch bridge arm of the primary side switching circuit 1 and la disappear, and the first rectifier element S1 and the second rectifier element S2 of the first secondary side rectifier circuit 3 and 3a are always on, so that the first secondary side winding Ns1 and the second secondary side winding Ns2 of the magnetic assembly 2 and 2a in each basic power unit bear the output voltage Vo. However, due to the additional windings Na1 and Na2, the additional windings Na1 and Na2 couple out 4 times the output voltage Vo and apply it to the additional inductor La, resulting in a large increase in the current of the additional inductor La, thereby greatly reducing the current of the first secondary side winding Ns1 and the second secondary side winding Ns2 of each basic power unit, thereby greatly suppressing the overshoot of the output voltage Vo.

[0128] In summary, the present application provides a power conversion module and a magnetic assembly thereof. Due to the fact that the magnetic resistance of the second magnetic column and the fourth magnetic column of the magnetic core assembly of the power conversion module is greater than that of the first magnetic column and the third magnetic column, respectively, and the primary side winding and the secondary side winding are arranged in a cross manner, the magnetic assembly of the power conversion module has the advantages of small alternating current ripple of the current flowing through the primary side winding and the secondary side winding, and strong current saturation resistance of the magnetic core. In addition, since the primary side switching circuit, the first secondary side rectifier circuit, the first magnetic assembly and the first positive output terminal pin of the power conversion module are arranged in sequence along the same X direction of the printed circuit board, the width of the power conversion module in the Y direction perpendicular to the X direction can be reduced, and the expansion of the output current or the output power of the power conversion module is facilitated. Therefore, the size structure of the power conversion module is suitable for applications such as display cards or ASIC cards, so that the power conversion module has the advantages of small size and high power density.

[0129] The application can be modified in various ways without departing from the scope of the application as defined in the appended claims.

Claims

1. A magnetic assembly, comprising: at least one magnetic core assembly, comprising: a first magnetic cover and a second magnetic cover; and a first magnetic leg, a second magnetic leg, a third magnetic leg, and a fourth magnetic leg, the first magnetic leg and the third magnetic leg being oppositely disposed between the first magnetic cover and the second magnetic cover, the second magnetic leg and the fourth magnetic leg being oppositely disposed between the first magnetic cover and the second magnetic cover, the first magnetic leg and the third magnetic leg being located between the second magnetic leg and the fourth magnetic leg, the second magnetic leg and the fourth magnetic leg having a magnetic reluctance greater than the first magnetic leg and the third magnetic leg, respectively, and the first magnetic leg, the second magnetic leg, the third magnetic leg, and the fourth magnetic leg collectively defining a communication region therebetween; a primary winding wound on the first magnetic leg and the third magnetic leg via the communication region, and the first magnetic leg and the third magnetic leg having opposite magnetic flux directions; and a first secondary winding and a second secondary winding, a first end of the first secondary winding being threaded between the first magnetic leg and the second magnetic leg, a second end of the first secondary winding being threaded between the third magnetic leg and the fourth magnetic leg, a first end of the second secondary winding being threaded between the first magnetic leg and the fourth magnetic leg, a second end of the second secondary winding being threaded between the second magnetic leg and the third magnetic leg, and portions of the first secondary winding and the second secondary winding being located within the communication region.

2. The magnetic assembly of claim 1, wherein the primary winding is wound on the first magnetic leg and the third magnetic leg via the communication region in an alternating fashion presenting an ∞-shaped pattern.

3. The magnetic assembly of claim 1, wherein the primary winding is first wound partially on the first magnetic leg, and the remaining portion of the primary winding is then wound on the third magnetic leg via the communication region.

4. The magnetic assembly of claim 1, wherein portions of the first secondary winding and the second secondary winding are located within the communication region presenting a cross-over pattern forming an upper and a lower.

5. The magnetic assembly of claim 1, wherein the first end of the first secondary winding and the first end of the second secondary winding are on the same side of the magnetic assembly.

6. The magnetic assembly of claim 1, wherein a first end of the primary winding is threaded between the first magnetic leg and the fourth magnetic leg, a second end of the primary winding is threaded out from between the first magnetic leg and the second magnetic leg, and the first end and the second end of the primary winding are on the same side of the magnetic assembly.

7. The magnetic assembly of claim 1, wherein the first end of the primary winding, the first end of the first secondary winding, and the first end of the second secondary winding are on the same side of the magnetic assembly.

8. The magnetic assembly of claim 1, wherein a length of an air gap of the second magnetic leg and a length of an air gap of the fourth magnetic leg are greater than a length of an air gap of the first magnetic leg and a length of an air gap of the third magnetic leg, respectively.

9. The magnetic assembly of claim 8, wherein the air gap of each of the first magnetic leg, the second magnetic leg, the third magnetic leg and the fourth magnetic leg is located in an upper region of the corresponding magnetic leg adjacent to the first magnetic cover, in a lower region of the corresponding magnetic leg adjacent to the second magnetic cover, or in a middle region of the corresponding magnetic leg.

10. The magnetic assembly of claim 8, wherein the length of the air gap of the first magnetic leg and the length of the air gap of the third magnetic leg are zero, respectively.

11. The magnetic assembly of claim 1, wherein the second magnetic leg and the fourth magnetic leg are made of a material different from the material of the rest of the magnetic core assembly.

12. The magnetic assembly of claim 11, wherein the material of the second magnetic leg and the fourth magnetic leg is a distributed air gap ferrite powder material, and the material of the rest of the magnetic core assembly is a ferrite material.

13. The magnetic assembly of claim 1, wherein the current flowing through the first secondary winding flows into the first end of the first secondary winding and out of the second end of the first secondary winding, and the current flowing through the second secondary winding flows into the first end of the second secondary winding and out of the second end of the second secondary winding.

14. The magnetic assembly of claim 1, wherein a first voltage is applied across the first end and the second end of the first secondary winding, and a second voltage is applied across the first end and the second end of the second secondary winding, the first voltage and the second voltage being 180° out of phase.

15. The magnetic assembly of claim 1, wherein the sum of the cross-sectional areas of the second magnetic leg and the fourth magnetic leg is greater than the sum of the cross-sectional areas of the first magnetic leg and the third magnetic leg.

16. The magnetic assembly of claim 1, wherein the cross-sectional area of the second magnetic leg is approximately or equal to the cross-sectional area of the fourth magnetic leg, within an error of ±20%, and wherein the cross-sectional area of the first magnetic leg is approximately or equal to the cross-sectional area of the third magnetic leg, within an error of ±20%.

17. The magnetic assembly of claim 1, wherein the primary winding, the first secondary winding and the second secondary winding are embedded in a multi-layer printed circuit board and are located in different layers of the multi-layer printed circuit board.

18. The magnetic assembly of claim 1, wherein the primary winding is electrically connected to an alternating voltage, the alternating voltage having two voltage levels or three voltage levels.

19. The magnetic assembly of claim 1, wherein the first secondary winding and the second secondary winding are electrically connected to a conductor, the conductor constituting an output terminal of a power conversion module.

20. The magnetic assembly of claim 19, wherein the conductor is formed on a wall surface of the second magnetic cover by electroplating or damascene.

21. The magnetic assembly of claim 1, wherein the magnetic assembly further comprises an additional winding wound on the second magnetic leg and the fourth magnetic leg in series with the winding in terms of the polarity of the voltage across the winding.

22. The magnetic assembly of claim 1, wherein the magnetic assembly further comprises an additional winding wound on the second magnetic leg and the fourth magnetic leg in parallel with the winding in terms of the polarity of the voltage across the winding.

23. The magnetic assembly of claim 21 or 22, wherein the number of turns of the additional winding wound on the first magnetic leg and the number of turns wound on the third magnetic leg are each greater than or equal to one.

24. The magnetic assembly of claim 21 or 22, further comprising an additional inductor electrically connected in series with the additional winding.

25. A power conversion module, comprising: a printed circuit board; and a first basic power unit disposed on the printed circuit board and comprising: the magnetic assembly of claim 1; a primary side switching circuit; a first secondary side rectifying circuit; and a first positive output terminal pin; wherein the primary side switching circuit, the first secondary side rectifying circuit, the magnetic assembly, and the first positive output terminal pin are sequentially arranged along a first direction of the printed circuit board.

26. The power conversion module of claim 25, wherein the primary side switching circuit comprises a switching leg comprising two switches electrically connected in series, a leg midpoint between the two switches is electrically connected to a first end of the primary winding of the magnetic assembly, and the two switches are disposed on a first side of the printed circuit board.

27. The power conversion module of claim 26, wherein the primary side switching circuit comprises a capacitor leg electrically connected in parallel with the switching leg and comprising two capacitors electrically connected in series, a leg midpoint between the two capacitors is electrically connected to a second end of the primary winding of the magnetic assembly, and the two capacitors are disposed on a second side of the printed circuit board opposite the first side.

28. The power conversion module of claim 26, wherein the primary side switching circuit comprises another switching leg electrically connected in parallel with the switching leg and comprising two switches electrically connected in series, a leg midpoint between the two switches of the switching leg is electrically connected to a second end of the primary winding of the magnetic assembly.

29. The power conversion module of claim 27, wherein the power conversion module further comprises a plurality of input terminal pins, a plurality of negative output terminal pins, and a plurality of signal control and detection signal pins disposed on the second side along two opposite side regions in a second direction, the first direction being perpendicular to the second direction.

30. The power conversion module of claim 28, wherein the primary side switching circuit further comprises a DC blocking capacitor electrically connected in series with the primary winding.

31. The power conversion module of claim 25, wherein the direction of current flow through the first secondary winding and the direction of current flow through the second secondary winding are the same. ​ ​ ​ ​ ​ ​ ​ 32. The power conversion module of claim 25, wherein the power conversion module further comprises a second magnetic assembly, a second secondary rectifier circuit, and a second positive output terminal pin, the second positive output terminal pin, the second magnetic assembly, the second secondary rectifier circuit, the primary side switching circuit, the first secondary rectifier circuit, the magnetic assembly, and the first positive output terminal pin are sequentially arranged along the first direction of the printed circuit board.

33. The power conversion module of claim 32, wherein the magnetic assembly and the second magnetic assembly have the same structure, and the primary side winding of the magnetic assembly and the primary side winding of the second magnetic assembly are connected in series.

34. The power conversion module of claim 25, wherein the power conversion module further comprises a second basic power unit, the second basic power unit has the same structure as the first basic power unit, and the positive output terminal pin of the second basic power unit, the magnetic assembly of the second basic power unit, the first secondary rectifier circuit of the second basic power unit, the primary side switching circuit of the second basic power unit, the primary side switching circuit of the first basic power unit, the first secondary rectifier circuit of the first basic power unit, the magnetic assembly of the first basic power unit, and the positive output terminal pin of the first basic power unit are sequentially arranged along the first direction of the printed circuit board.

35. The power conversion module of claim 25, wherein the first secondary rectifier circuit, the first secondary winding, the second secondary winding, and the first positive output terminal pin form a center-tapped rectifier circuit.

36. The power conversion module of claim 25, wherein the first magnetic cover and the second magnetic cover are respectively fastened to the printed circuit board from a first side and a second side of the printed circuit board opposite to each other.

37. The power conversion module of claim 25, wherein the first secondary rectifier circuit further comprises a first rectifier assembly and a second rectifier assembly, the first rectifier assembly comprises a first rectifier element and a second rectifier element which are electrically connected in parallel and are metal oxide semiconductor field effect transistors, the second rectifier assembly comprises a first rectifier element and a second rectifier element which are electrically connected in parallel and are metal oxide semiconductor field effect transistors, the first rectifier element of the first rectifier assembly and the first rectifier element of the second rectifier assembly are disposed on a first side of the printed circuit board, the second rectifier element of the first rectifier assembly and the second rectifier element of the second rectifier assembly are disposed on a second side of the printed circuit board opposite to the first side, and the first rectifier element of the first rectifier assembly and the second rectifier element of the first rectifier assembly are correspondingly positioned on the printed circuit board, and the first rectifier element of the second rectifier assembly and the second rectifier element of the second rectifier assembly are correspondingly positioned on the printed circuit board.

38. The power conversion module of claim 25, wherein the first positive output terminal pin is disposed on the printed circuit board.

39. The power conversion module of claim 25, wherein the first positive output terminal pin is formed on the second magnetic cover of the magnetic assembly by plating or damascene.

Images