Power conversion circuit and power supply module based on same

Abstract

The utility model discloses a power conversion circuit and a power supply module based on the same. The power conversion circuit comprises a Vin, a GND, a near-end power conversion unit and a far-end power conversion unit, wherein the near-end power conversion unit and the far-end power conversion unit are connected between the Vin and the GND in parallel. The near-end power conversion unit comprises S1, S2 and Q1 which are connected in series; the far-end power conversion unit comprises S4, S3 and Q2 which are connected in series; the dotted terminal of the first high-side winding P1 is connected with the node L1, and the synonym terminal of the P1 is connected with one end of the resonant capacitor bank; the other end of the resonant capacitor bank is connected with the dotted terminal of the second high-side winding P2, and the synonym terminal of the P2 is connected with the node R1; the dotted terminal of the first low-side winding T1 is connected with the node L2, the synonym terminal of the T1 is connected with the dotted terminal of the second low-side winding T2, and the synonym terminal of the T2 is connected with the node R2; an output terminal Vo is connected to a connecting line between the first low-side winding T1 and the second low-side winding T2; the input capacitor is arranged between the Vin and the GND or between the Vin and the Vo; and the output capacitor Co is arranged between the Vo and the GND.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of power conversion circuit, power module based thereon. BACKGROUND

[0002] The rapid development of artificial intelligence (AI), large language models (LLM), and other technologies has accelerated the power supply needs of data centers. AI chips, such as GPUs, TPUs, and ASICs, require more and more power. For example, the power of Nvidia GPU chips has increased from 300W for the A100 to 700W for the H100. Considering the limited board area, the sudden increase in AI chip power has placed higher demands on the power density and efficiency of chip power supplies. The intermediate bus architecture is the mainstream architecture for AI chip on-board power supplies, including a bus converter that provides a fixed voltage ratio (such as 4:1 or 8:1) in the front stage, and a multi-phase voltage regulation module in the back stage. The Open Computing Project (OCP) has established relevant standards for AI chip on-board power supplies, which have strict requirements for bus converter size and efficiency. The 4:1 intermediate bus architecture is the preferred solution for AI chip manufacturers. Therefore, under the limited standard size, how to further improve the output power, efficiency, and power density of the 4:1 bus converter to meet the needs of the next generation of AI chips is a problem that needs to be solved urgently. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a high-power power conversion circuit for the power supply of the next generation of AI chips.

[0004] To solve the above technical problems, the utility model employs the following technical scheme: a power conversion circuit includes an input terminal Vin and a ground terminal GND, a near-end power conversion unit and a far-end power conversion unit connected in parallel between the input terminal Vin and the ground terminal GND; the near-end power conversion unit includes a first main control switch S1, a second main control switch S2, and a first synchronous rectification switch Q1 connected in series; the far-end power conversion unit includes a fourth main control switch S4, a third main control switch S3, and a second synchronous rectification switch Q2 connected in series; the connection node of the first main control switch S1 and the second main control switch S2 is denoted as L1, and the connection node of the second main control switch S2 and the first synchronous rectification switch Q1 is denoted as L2; the connection node of the fourth main control switch S4 and the third main control switch S3 is denoted as R1, and the connection node of the third main control switch S3 and the second synchronous rectification switch Q2 is denoted as R2;

[0005] The same name end of the first high side winding P1 is connected with a node L1, and the opposite name end of the first high side winding P1 is connected with one end of a resonance capacitor group Cr; the other end of the resonance capacitor group Cr is connected with the same name end of a second high side winding P2, and the opposite name end of the second high side winding P2 is connected with a node R1;

[0006] The same name end of the first low side winding T1 is connected with a node L2, the opposite name end of the first low side winding T1 is connected with the same name end of a second low side winding T2, and the opposite name end of the second low side winding T2 is connected with a node R2; the output terminal Vo is connected on the wire connection between the first low side winding T1 and the second low side winding T2;

[0007] The input capacitor Cin is arranged between the input terminal Vin and the ground terminal GND or between the input terminal Vin and the output terminal Vo; and the output capacitor Co is arranged between the output terminal Vo and the ground terminal GND.

[0008] As a preferred scheme, the resonance capacitor group Cr includes a first resonance capacitor 51 and a second resonance capacitor 62 in parallel.

[0009] The technical problem to be solved by the utility model is to provide a power module based on the above power conversion circuit.

[0010] In order to solve the above technical problem, the utility model adopts the technical scheme of a power module based on the above power conversion circuit, including printed circuit board PCB, planar transformer, the planar transformer includes magnetic core and magnetic assembly;The magnetic core includes the first magnetic substrate, the second magnetic substrate and the first side edge magnetic column, the middle magnetic column, the second side edge magnetic column arranged in parallel, the first side edge magnetic column, the middle magnetic column, the second side edge magnetic column are arranged between the first magnetic substrate and the second magnetic substrate;The passage between the middle magnetic column, the first side edge magnetic column, the second side edge magnetic column is a wire winding passage;The printed circuit board PCB is bridged on both sides outside the first side edge magnetic column and the second side edge magnetic column as the passage;

[0011] The magnetic assembly includes four windings, which are the first high side winding P1, the second high side winding P2, the first low side winding T1 and the second low side winding T2, and the four windings are wound on the middle magnetic column through the wire winding passage.

[0012] The printed circuit board PCB is provided with a middle magnetic core hole matched with the middle magnetic column, a first magnetic core hole matched with the first magnetic substrate and a second magnetic core hole matched with the second magnetic substrate,

[0013] The side of the transformer on the top surface of the printed circuit board (PCB) is provided with the first main control switch S1, the second main control switch S2, the third main control switch S3, the fourth main control switch S4, and the first resonance capacitor, and is referred to as the input side of the power module; the other side of the transformer on the top surface of the printed circuit board (PCB) is provided with the first synchronous rectification switch Q1, the second synchronous rectification switch Q2, and the output capacitor Co, and is referred to as the output side of the power module.

[0014] The input capacitor Cin, the second resonance capacitor, and the first drive chip and the second drive chip are arranged on the input side of the power module on the bottom surface of the printed circuit board (PCB), the second resonance capacitor is arranged on the back of the first resonance capacitor and is connected in parallel therewith; the first synchronous rectification switch Q1, the second synchronous rectification switch Q2, and the output capacitor Co, and the third drive chip and the fourth drive chip are arranged on the output side of the power module on the bottom surface of the printed circuit board (PCB).

[0015] The same name end of the first high-side winding P1 is connected to the node L1 through a via, and then is wound in a winding channel and connected to one end of the resonance capacitor group Cr through a via; the other end of the resonance capacitor group Cr is connected to the same name end of the second high-side winding P2 through a via, and then is wound in a winding channel and connected to the node R1 through a via; the node L1 is connected to the source of the first main control switch S1 through a via, and the node R1 is connected to the source of the second main control switch S2 through a via.

[0016] As a preferred scheme, the same name end of the first low-side winding T1 is connected to the node L2 through a via, and then is wound in a winding channel and connected to the output terminal Vo through a via; the different name end of the second low-side winding T2 is connected to the node R2 through a via, and then is wound in a winding channel and connected to the output terminal Vo through a via; the node L2 is connected to the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected to the drain of the second synchronous rectification switch Q2 through a via.

[0017] The second main control switch S2 and the first synchronous rectification switch Q1 are connected through a first bridge channel; the third main control switch S3 and the second synchronous rectification switch Q2 are connected through a second bridge channel; the first main control switch S1 and the second main control switch S2 are connected through a first PCB line, and the third main control switch S3 and the fourth main control switch S4 are connected through a second PCB line; the first main control switch S1 and the second main control switch S2 are connected to the input terminal Vin through a third PCB line.

[0018] As a preferred scheme, when the input capacitor Cin is arranged between the input terminal Vin and the output terminal Vo, the output terminal Vo is connected to the input capacitor Cin through a third bridge channel and a fourth bridge channel.

[0019] As a preferred scheme, the first resonant capacitor is arranged on the top surface of the printed circuit board, the second resonant capacitor is arranged on the bottom surface of the printed circuit board, the first resonant capacitor and the second resonant capacitor are symmetrically arranged, and are connected in parallel through the first via hole and the second via hole; the first via hole is connected with the first high-side winding P1, and the second via hole is connected with the second high-side winding P2.

[0020] As a preferred scheme, for the power module providing a fixed voltage ratio of 4:1, the number of turns of the first high-side winding P1 and the second high-side winding P2 is 1 turn; the number of turns of the first low-side winding T1 and the second low-side winding T2 is 1 turn.

[0021] As a preferred scheme, the first high-side winding P1 and the second high-side winding P2 are parallel multilayer PCB windings, and the first high-side winding P1 and the second high-side winding P2 are staggered.

[0022] The power module has the following beneficial effects:

[0023] The power conversion circuit of the power module decomposes the high-side winding of the planar transformer into two series-connected coils, and the resonant capacitor group is arranged between the two coils; specifically, the first high-side winding P1 and the second high-side winding P2 are wound symmetrically with respect to the center line axis of the module, the resonant capacitor group Cr is placed in the middle of the module, and the terminals of the resonant capacitor group Cr are connected with the high-side winding through the via hole. This design can make the current path completely symmetrical in the positive half cycle and the negative half cycle of the circuit operation, and the two side windings of the resonant capacitor group Cr achieve impedance matching, thereby greatly reducing the winding loss and leakage inductance of the transformer.

[0024] The input capacitor Cin of the power module is arranged between the input terminal Vin and the output terminal Vo, which can reduce the transmission path length of the high-side high-frequency resonant current by more than 20%, thereby significantly reducing the printed circuit board PCB line loss; in addition, this design can reduce the ripple current of the output capacitor by more than 25%, thereby significantly reducing the output capacitor loss.

[0025] The planar transformer structure and winding arrangement of the power module can make the high-side winding and the low-side winding be wound on the middle magnetic column, the high-side winding current and the low-side winding current can realize magnetic motive force offset, thereby reducing the winding loss caused by the proximity effect; the transformer winding is wrapped by the magnetic core, which can reduce the leakage inductance of the transformer.

[0026] The high-density power module layout provided by the utility model, four main control switch pieces S1, S2, S3 and S4, input capacitor Cin and resonance capacitor group Cr are arranged on one side of the planar transformer, and the side is the input side of the power module; two synchronous rectification switch pieces Q1 and Q2 and output capacitor Co are arranged on the other side of the planar transformer, and the side is the output side of the power module; the input side and the output side are separated by the planar transformer, the layout can minimize the transmission distance of the large current circuit and reduce the printed circuit board PCB line loss; the layout can arrange most of the switch pieces on the surface of the module, and the surface devices can directly touch the top heat sink, so that the module heat dissipation performance is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The power module power conversion circuit embodiment one is provided for the power module power conversion circuit embodiment one.

[0028] Figure 2 The power module power conversion circuit embodiment two is provided for the power module power conversion circuit embodiment two.

[0029] Figure 3 The power module schematic diagram using the planar transformer is provided for the power module schematic diagram using the planar transformer.

[0030] Figure 4 The magnetic core schematic diagram is provided for the magnetic core schematic diagram.

[0031] Figure 5 The power module top layer layout schematic diagram is provided for the power module top layer layout schematic diagram.

[0032] Figure 6 The power module bottom layer layout schematic diagram is provided for the power module bottom layer layout schematic diagram.

[0033] Figure 7 The high side winding connection schematic diagram is provided for the high side winding connection schematic diagram.

[0034] Figure 8 Figure 9 The low side winding connection schematic diagram is provided for the low side winding connection schematic diagram.

[0035] Figure 10 The switch piece connection schematic diagram is provided for the switch piece connection schematic diagram.

[0036] Figure 11 The circuit embodiment two output terminal connection schematic diagram is provided for the circuit embodiment two output terminal connection schematic diagram.

[0037] Figure 12 The resonance capacitor group and high side winding connection schematic diagram is provided for the resonance capacitor group and high side winding connection schematic diagram.

[0038] Figure 13 The circuit control timing diagram is provided for the circuit control timing diagram. DETAILED DESCRIPTION

[0039] The specific implementation scheme of the utility model is described in detail below in combination with the drawings.

[0040] As Figure 1As shown, a power conversion circuit includes an input terminal Vin and a ground terminal GND, a near-end power conversion unit and a far-end power conversion unit connected in parallel between the input terminal Vin and the ground terminal GND; the near-end power conversion unit includes a first main control switch S1, a second main control switch S2 and a first synchronous rectifier switch Q1 connected in series; the far-end power conversion unit includes a fourth main control switch S4, a third main control switch S3 and a second synchronous rectifier switch Q2 connected in series; the connection node between the first main control switch S1 and the second main control switch S2 is denoted as L1, the connection node between the second main control switch S2 and the first synchronous rectifier switch Q1 is denoted as L2; ​​the connection node between the fourth main control switch S4 and the third main control switch S3 is denoted as R1, and the connection node between the third main control switch S3 and the second synchronous rectifier switch Q2 is denoted as R2;

[0041] The same-name terminal of the first high-side winding P1 is connected to node L1, and the opposite-name terminal of the first high-side winding P1 is connected to one end of the resonant capacitor group Cr; the other end of the resonant capacitor group Cr is connected to the same-name terminal of the second high-side winding P2, and the opposite-name terminal of the second high-side winding P2 is connected to node R1.

[0042] The same-name terminal of the first low-side winding T1 is connected to node L2, the opposite-name terminal of the first low-side winding T1 is connected to the same-name terminal of the second low-side winding T2, and the opposite-name terminal of the second low-side winding T2 is connected to node R2; the output terminal Vo is connected to the connection line between the first low-side winding T1 and the second low-side winding T2.

[0043] The input capacitor Cin is placed between the input terminal Vin and the ground terminal GND; the output capacitor Co is placed between the output terminal Vo and the ground terminal GND.

[0044] The resonant capacitor group Cr includes a first resonant capacitor 51 and a second resonant capacitor 62 connected in parallel.

[0045] like Figure 2 The diagram shows another power conversion circuit. The difference between this circuit and the one described above is that the input capacitor Cin is placed between the input terminal Vin and the output terminal Vo.

[0046] like Figures 3-12As shown, a power module includes a printed circuit board PCB 11, a planar transformer, the planar transformer includes a magnetic core 12 and a magnetic assembly; the magnetic core includes a first magnetic substrate 21, a second magnetic substrate 22 and a first side magnetic column 23, an intermediate magnetic column 24, a second side magnetic column 25 arranged in parallel, the first side magnetic column 23, the intermediate magnetic column 24 and the second side magnetic column 25 are arranged between the first magnetic substrate 21 and the second magnetic substrate 22; the channels between the intermediate magnetic column 24, the first side magnetic column 23 and the second side magnetic column 25 are wire winding channels; the printed circuit board PCB 11 has bridge channels on both sides outside the first side magnetic column 23 and the second side magnetic column 25.

[0047] The magnetic assembly includes four windings, which are the first high-side winding P1, the second high-side winding P2, the first low-side winding T1 and the second low-side winding T2, and the four windings are wound on the intermediate magnetic column 24 through the wire winding channels.

[0048] The printed circuit board PCB 11 is provided with an intermediate magnetic core hole matched with the intermediate magnetic column 24, a first magnetic core hole 54 matched with the first magnetic substrate 21, and a second magnetic core hole 55 matched with the second magnetic substrate 22,

[0049] The first main control switch S1, the second main control switch S2, the third main control switch S3, the fourth main control switch S4 and the first resonance capacitor 51 are arranged on one side of the transformer on the top surface of the printed circuit board PCB 11, which is referred to as the input side of the power module; the first synchronous rectification switch Q1, the second synchronous rectification switch Q2 and the output capacitor Co52 are arranged on the other side of the transformer on the top surface of the printed circuit board PCB 11, which is referred to as the output side of the power module. The first synchronous rectification switch Q1 includes a plurality of first rectification switch single pieces Q1' connected in parallel, and the second synchronous rectification switch Q2 includes a plurality of second rectification switch single pieces Q2' connected in parallel.

[0050] As shown, Figure 6 The input capacitor Cin61, the second resonance capacitor 62 and the first drive chip 64 and the second drive chip 65 are arranged on the input side of the power module on the bottom surface of the printed circuit board PCB 11, the second resonance capacitor 62 is arranged on the back surface of the first resonance capacitor 51 and connected in parallel therewith; the first synchronous rectification switch Q1, the second synchronous rectification switch Q2, the output capacitor Co52 and the third drive chip 66 and the fourth drive chip 67 are arranged on the output side of the power module on the bottom surface of the printed circuit board PCB 11;

[0051] As shown, Figure 7As shown, the first high-side winding P1 71 is connected with the node L1 through a via, and then is wound in the winding channel and connected with one end of the resonance capacitor group Cr through a via; the other end of the resonance capacitor group Cr is connected with the second high-side winding P2 72 through a via, and then is wound in the winding channel and connected with the node R1 through a via; the node L1 is connected with the source of the first main control switch S1 through a via, and the node R1 is connected with the source of the second main control switch S2 through a via.

[0052] As shown in FIG. 6, the first low-side winding T1 81 is connected with the node L2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; as shown in FIG. 7, the second low-side winding T2 91 is connected with the node R2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; the node L2 is connected with the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected with the drain of the second synchronous rectification switch Q2 through a via. Figure 8 Figure 9 As shown in FIG. 6, the first low-side winding T1 81 is connected with the node L2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; as shown in FIG. 7, the second low-side winding T2 91 is connected with the node R2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; the node L2 is connected with the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected with the drain of the second synchronous rectification switch Q2 through a via.

[0053] For the power module providing a fixed voltage ratio of 4:1, the number of turns of the first high-side winding P1 and the second high-side winding P2 is 1 turn. The number of turns of the first low-side winding T1 and the second low-side winding T2 is 1 turn.

[0054] As shown in FIG. 6, the first low-side winding T1 81 is connected with the node L2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; as shown in FIG. 7, the second low-side winding T2 91 is connected with the node R2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; the node L2 is connected with the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected with the drain of the second synchronous rectification switch Q2 through a via. Figure 10 As shown in FIG. 6, the first low-side winding T1 81 is connected with the node L2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; as shown in FIG. 7, the second low-side winding T2 91 is connected with the node R2 through a via, and then is wound in the winding channel and connected with the output terminal Vo through a via; the node L2 is connected with the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected with the drain of the second synchronous rectification switch Q2 through a via.

[0055] Figure 11 When the input capacitor Cin is placed between the input terminal Vin and the output terminal Vo, the output terminal Vo is connected to the input capacitor Cin 61 through the third bridge channel 101 and the fourth bridge channel 102, and the circuit schematic is as shown in FIG. 8.

[0056] The connection mode of the first high-side winding P1, the second high-side winding P2 and the resonance capacitor group Cr is as shown in FIG. 9. The first resonance capacitor 51 is placed on the top surface 121 of the printed circuit board, the second resonance capacitor 62 is placed on the bottom surface 122 of the printed circuit board, the first resonance capacitor 51 and the second resonance capacitor 62 are symmetrically arranged, and are connected in parallel through the first via 123 and the second via 124. Figure 12

[0057] ​​​The first via 123 is connected to the first high-side winding P1, and the second via 124 is connected to the second high-side winding P2. The first high-side winding P1 and the second high-side winding P2 are multi-layer PCB windings connected in parallel. Figure 12 The schematic diagram shows two layers in parallel; the first high-side winding P1 and the second high-side winding P2 are arranged alternately.

[0058] This design allows the current path to be completely symmetrical in the positive and negative half-cycles of the circuit, and achieves impedance matching between the two windings of the resonant capacitor bank, thereby significantly reducing transformer winding losses and leakage inductance.

[0059] like Figure 13 As shown, the power module is controlled as follows: the first main control switch S1, the third main control switch S3, and the first synchronous rectifier switch Q1 are controlled to turn on and off by signal 1; the second main control switch S2, the fourth main control switch S4, and the second synchronous rectifier switch Q2 are controlled to turn on and off by signal 2; signals 1 and 2 are complementary in conduction with a duty cycle of 50%, and a dead zone is reserved between signals 1 and 2; the leakage inductance of the planar transformer resonates with the resonant capacitor bank Cr. The switching frequency of signals 1 and 2 is 0.9-1.1 times the resonant frequency.

[0060] The power module is started as follows: the first main control switch S1 and the third main control switch S3 are controlled to turn on and off by signal 3; the second main control switch S2 and the fourth main control switch S4 are controlled to turn on and off by signal 4; the first synchronous rectifier switch Q1 is controlled to turn on and off by signal 5; the second synchronous rectifier switch Q2 is controlled to turn on and off by signal 6; signals 3 and 4 are complementary in conduction, and signals 5 and 6 are complementary in conduction; signals 3 and 5 are in phase, and signals 4 and 6 are in phase; during startup, the duty cycle of signals 3 and 4 gradually increases from 0 to 50%, and the duty cycle of signals 5 and 6 gradually increases from 0 to 50%. The deployment time of signals 5 and 6 is 0.9 times the deployment time of signals 3 and 4.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the protection scope of the present invention.

Claims

1. A power conversion circuit comprising an input terminal Vin and a ground terminal GND, a near-end power conversion unit and a far-end power conversion unit connected in parallel between the input terminal Vin and the ground terminal GND; the near-end power conversion unit comprising a first master switch S1, a second master switch S2 and a first synchronous rectification switch Q1 connected in series; the far-end power conversion unit comprising a fourth master switch S4, a third master switch S3 and a second synchronous rectification switch Q2 connected in series; a connection node of the first master switch S1 and the second master switch S2 is denoted as L1, a connection node of the second master switch S2 and the first synchronous rectification switch Q1 is denoted as L2; a connection node of the fourth master switch S4 and the third master switch S3 is denoted as R1, a connection node of the third master switch S3 and the second synchronous rectification switch Q2 is denoted as R2; a same-name end of a first high-side winding P1 is connected to the node L1, an opposite-name end of the first high-side winding P1 is connected to one end of a resonance capacitor group Cr; the other end of the resonance capacitor group Cr is connected to a same-name end of a second high-side winding P2, an opposite-name end of the second high-side winding P2 is connected to the node R1; a same-name end of a first low-side winding T1 is connected to the node L2, an opposite-name end of the first low-side winding T1 is connected to a same-name end of a second low-side winding T2, an opposite-name end of the second low-side winding T2 is connected to the node R2; a connection line between the first low-side winding T1 and the second low-side winding T2 is connected to an output terminal Vo; an input capacitor Cin is arranged between the input terminal Vin and the ground terminal GND or between the input terminal Vin and the output terminal Vo; an output capacitor Co is arranged between the output terminal Vo and the ground terminal GND. characterized in that The resonance capacitor group Cr comprises a first resonance capacitor (51) and a second resonance capacitor (62) connected in parallel. The power conversion circuit comprises a printed circuit board (PCB) (11) and a planar transformer, the planar transformer comprising a magnetic core (12) and a magnetic assembly; the magnetic core comprises a first magnetic substrate (21), a second magnetic substrate (22) and a first side magnetic column (23), a middle magnetic column (24) and a second side magnetic column (25) arranged in parallel, the first side magnetic column (23), the middle magnetic column (24) and the second side magnetic column (25) being arranged between the first magnetic substrate (21) and the second magnetic substrate (22); a channel between the middle magnetic column (24), the first side magnetic column (23) and the second side magnetic column (25) is a winding channel; the printed circuit board (PCB) (11) has a bridging channel on both sides outside the first side magnetic column (23) and the second side magnetic column (25); The magnetic assembly comprises four windings, namely the first high-side winding P1, the second high-side winding P2, the first low-side winding T1 and the second low-side winding T2, the four windings being wound on the middle magnetic column (24) through the winding channel; 2. A power conversion circuit as claimed in claim 1, characterized in that: The printed circuit board (PCB) (11) is provided with a middle magnetic core hole matched with the middle magnetic column (24), a first magnetic core hole (54) matched with the first magnetic substrate (21) and a second magnetic core hole (55) matched with the second magnetic substrate (22).

3. A power supply module based on the power conversion circuit of claim 2, characterized by: ​ ​ ​ The transformer on the top surface of the printed circuit board (PCB) (11) is provided with the first main control switch S1, the second main control switch S2, the third main control switch S3, the fourth main control switch S4 and the first resonance capacitor (51), and this side is called the input side of the power module; the transformer on the top surface of the printed circuit board (PCB) (11) is provided with the first synchronous rectification switch Q1, the second synchronous rectification switch Q2 and the output capacitor Co (52), and this side is called the output side of the power module; The input capacitor Cin (61), the second resonance capacitor (62) and the first drive chip (64) and the second drive chip (65) are arranged on the input side of the power module on the bottom surface of the printed circuit board (PCB) (11), and the second resonance capacitor (62) is arranged on the back of the first resonance capacitor (51) and is connected in parallel with the first resonance capacitor (51); the first synchronous rectification switch Q1, the second synchronous rectification switch Q2, the output capacitor Co (52) and the third drive chip (66) and the fourth drive chip (67) are arranged on the output side of the power module on the bottom surface of the printed circuit board (PCB) (11); The same end of the first high-side winding P1 (71) is connected to the node L1 through a via, and then is wound in the winding channel and connected to one end of the resonance capacitor group Cr through a via; the other end of the resonance capacitor group Cr is connected to the same end of the second high-side winding P2 (72) through a via, and then is wound in the winding channel and connected to the node R1 through a via; The node L1 is connected to the source of the first main control switch S1 through a via, and the node R1 is connected to the source of the second main control switch S2 through a via.

4. A power conversion circuit based power supply module as recited in claim 3, wherein: The same end of the first low-side winding T1 (81) is connected to the node L2 through a via, and then is wound in the winding channel and connected to the output terminal Vo through a via; the different end of the second low-side winding T2 (91) is connected to the node R2 through a via, and then is wound in the winding channel and connected to the output terminal Vo through a via; the node L2 is connected to the drain of the first synchronous rectification switch Q1 through a via, and the node R2 is connected to the drain of the second synchronous rectification switch Q2 through a via; The second main control switch S2 and the first synchronous rectification switch Q1 are connected through the first bridge channel (114); the third main control switch S3 and the second synchronous rectification switch Q2 are connected through the second bridge channel (115); the first main control switch S1 and the second main control switch S2 are connected through the first PCB line (112), and the third main control switch S3 and the fourth main control switch S4 are connected through the second PCB line (113); the first main control switch S1 and the second main control switch S2 are connected to the input terminal Vin through the third PCB line (111).

5. A power conversion circuit based power supply module as recited in claim 4, wherein: When the input capacitor Cin is arranged between the input terminal Vin and the output terminal Vo, the output terminal Vo is connected to the input capacitor Cin61 through the third bridge channel (101) and the fourth bridge channel (102).

6. A power conversion circuit based power supply module as recited in claim 5, wherein: The first resonant capacitor (51) is arranged on the top surface (121) of the printed circuit board, the second resonant capacitor (62) is arranged on the bottom surface (122) of the printed circuit board, the first resonant capacitor (51) and the second resonant capacitor (62) are symmetrically arranged and are connected in parallel through the first via (123) and the second via (124); the first via (123) is connected with the first high-side winding P1, and the second via (124) is connected with the second high-side winding P2.

7. A power conversion circuit based power module according to claim 6, wherein: For a power module providing a fixed voltage ratio of 4:1, the number of turns of the first high-side winding P1 and the second high-side winding P2 is 1 turn; the number of turns of the first low-side winding T1 and the second low-side winding T2 is 1 turn.

8. The power conversion circuit based power supply module of claim 5, wherein: The first high-side winding P1 and the second high-side winding P2 are parallel multi-layer PCB windings, and the first high-side winding P1 and the second high-side winding P2 are staggered.

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