Single-stage power conversion device

Abstract

For a power conversion circuit with a high-power requirement, a primary side circuit adopts a parallel framework of two groups of full-bridge circuits, a secondary side circuit adopts N synchronous rectification units and N inductors, and N is a natural number of a multiple of 4; the four inductors are reversely coupled in the same inductor magnetic core; on the other hand, the invention provides the power conversion device, through component layout, reverse coupling of the four inductors is achieved, the size of the power conversion device is reduced, and the load dynamic performance of the power conversion device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-frequency power supply, and particularly relates to a single-stage power conversion device. BACKGROUND

[0002] In recent years, with the development of technologies in the fields of data centers, artificial intelligence, supercomputers and the like, more and more powerful ASICs, such as CPUs, GPUs, machine learning accelerators, network switches, servers and the like, are applied, which consume a large amount of current, for example, up to thousands of amperes. In order to meet the rapid response to the load dynamics, the current industry practice is to use a two-stage converter, i.e. a front-stage proportional converter (converting a 48V bus into a 12V bus or even lower) + a rear-stage voltage regulator (the voltage regulator often adopts multi-phase buck wrong-phase parallel connection, and then adds a decoupling inductor, so as to easily achieve the rapid response to the load dynamics) to realize the voltage conversion from 48V to 1V. However, due to the existence of the low-voltage bus (12V), a large conduction loss is generated, the overall efficiency is low, and the application is relatively complex.

[0003] The second mode adopts a single-stage power converter, removes the 12V bus, and directly converts 48V to 1V or lower. The conversion efficiency of the power conversion component of the single-stage converter is relatively high and the power density is relatively high. However, the output inductor of the single-stage converter is often integrated in the transformer, so that the transformer cannot be optimally designed, and thus the low conduction loss and the good dynamic performance cannot be simultaneously obtained.

[0004] Therefore, how to develop a power conversion component and an electronic device to solve the problems faced by the prior art is a topic urgently needed to be faced by the field. SUMMARY

[0005] Therefore, one of the purposes of the application is to provide a single-stage power conversion device, which comprises an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal, a primary side circuit and a secondary side circuit.

[0006] The primary side circuit comprises a first primary side sub-circuit and a second primary side sub-circuit connected in parallel. The secondary side circuit comprises a first secondary side circuit and a second secondary side circuit connected in parallel. The first secondary side circuit and the second secondary side circuit both comprise a synchronous unit and an inductor. The synchronous unit comprises a first synchronous unit and a second synchronous unit. The inductor comprises a first inductor and a second inductor.

[0007] Each of the synchronous units comprises a unit positive terminal and a unit negative terminal. The first inductor is connected across the unit positive terminal and the output positive terminal. The second inductor is connected across the unit negative terminal and the output negative terminal.

[0008] Four of the inductors are anti-coupled and disposed in the first inductor magnetic core; the first inductor and the second inductor are connected across a synchronous unit and an output positive terminal or an output negative terminal.

[0009] Preferably, the first synchronous unit further comprises a first SR combination and a secondary winding; the second synchronous unit further comprises a second SR combination and a secondary winding; each of the secondary windings comprises a first secondary winding and a second secondary winding; each of the SR combinations comprises a first synchronous rectifier switch and a second synchronous rectifier switch in common source; in the same synchronous unit, a first end of each of the secondary windings is electrically connected to a unit positive terminal, a second end of the first secondary winding is electrically connected to a drain of the first synchronous rectifier switch, and a second end of the second secondary winding is electrically connected to a drain of the second synchronous rectifier switch; a source of each of the synchronous rectifier switches is electrically connected to a unit negative terminal; a positive terminal of the first synchronous unit is electrically connected to a first end of the first inductor, a second end of the first inductor is electrically connected to the output positive terminal, and a negative terminal of the first synchronous unit is electrically connected to the output negative terminal; a positive terminal of the second synchronous unit is electrically connected to the output positive terminal, a negative terminal of the second synchronous unit is electrically connected to a first end of the second inductor, and a second end of the second inductor is electrically connected to the output negative terminal.

[0010] Preferably, the first primary sub-circuit comprises a first primary winding, and the second primary sub-circuit comprises a second primary winding; the first primary winding and four of the secondary windings in the first secondary sub-circuit are coupled in the same transformer magnetic core; and the second primary winding and four of the secondary windings in the second secondary sub-circuit are coupled in the same transformer magnetic core.

[0011] Preferably, the first inductor magnetic core comprises four inductor legs and an inductor center leg, the four inductor legs are disposed around the inductor center leg; and the four inductors are wound on one inductor leg respectively.

[0012] Preferably, first ends of the inductors wound on two adjacent inductor legs are electrically connected to the first synchronous unit and the second synchronous unit respectively, and second ends of the inductors wound on the two adjacent inductor legs are electrically connected to the output positive terminal and the output negative terminal respectively.

[0013] Preferably, the direct-current magnetic flux directions of the inductors wound on each of the inductor legs are the same.

[0014] Preferably, the power conversion device further comprises two transformer magnetic cores disposed on opposite sides of the first inductor magnetic core; each of the transformer magnetic cores comprises two transformer legs and a transformer center leg, the transformer center leg is disposed between the two transformer legs; the primary winding is wound around the transformer center leg N times, and each of the secondary windings is wound around the transformer center leg half a turn.

[0015] Preferably, the transformer magnetic core comprises opposite first and third sides, and opposite second and fourth sides; the third side of the transformer magnetic core is adjacent to the first inductor magnetic core; the first end and the second end of the primary winding are both adjacent to the third side; the first end of the two secondary winding of the first synchronous unit are both adjacent to the third side, and the second end of the two secondary winding of the first synchronous unit are both adjacent to the first side; the first end of the two secondary winding of the second synchronous unit are both adjacent to the first side, and the second end of the two secondary winding of the second synchronous unit are both adjacent to the third side.

[0016] Preferably, the power conversion device further comprises a third secondary side circuit and a fourth secondary side circuit, the third secondary side circuit and the fourth secondary side circuit both comprise a synchronous unit and an inductor, the synchronous unit comprises a first synchronous unit and a second synchronous unit, and the inductor comprises a first inductor and a second inductor; each of the synchronous units comprises a unit positive terminal and a unit negative terminal; the first inductor is connected between the unit positive terminal and the output positive terminal, and the second inductor is connected between the unit negative terminal and the output negative terminal; the four inductors in the third secondary side circuit and the fourth secondary side circuit are anti-coupled and arranged in the second inductor magnetic core; the first inductor and the second inductor are both connected between one synchronous unit and the output positive terminal or the output negative terminal.

[0017] Preferably, the power conversion device further comprises two transformer magnetic cores, the first inductor magnetic core and the second inductor magnetic core are arranged between the two transformer magnetic cores; each of the transformer magnetic cores comprises two transformer legs and two transformer winding legs, the transformer winding legs are arranged between the two transformer legs, and the two transformer winding legs and the two transformer legs are arranged in a line; the primary winding is wound around each of the transformer winding legs for N turns; the four secondary windings in each of the secondary side circuits are each wound around one of the transformer winding legs for half a turn, and each of the transformer winding legs is wound with the four secondary windings in one secondary side circuit.

[0018] Preferably, each of the primary sub-circuits further comprises a first primary switch, a second primary switch, a third primary switch, and a fourth primary switch; the first primary switch and the second primary switch are connected in series as a first switch bridge arm, and the third primary switch and the fourth primary switch are connected in series as a second switch bridge arm; the drain of the first primary switch and the drain of the third primary switch are both electrically connected to the input positive terminal, and the source of the second primary switch and the source of the fourth primary switch are both electrically connected to the input negative terminal; the first end of the primary winding is electrically connected to the midpoint of the first switch bridge arm, and the second end of the primary winding is electrically connected to the midpoint of the second switch bridge arm.

[0019] Preferably, the first end of each of the primary windings, the first end of each of the first secondary windings, and the second end of each of the second secondary windings are the same end and are marked as point ends.

[0020] Preferably, the power conversion device further includes a first control signal, a second control signal, a third control signal, a fourth control signal, a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal; wherein the first control signal, the second control signal, the third control signal, and the fourth control signal have equal duty cycles and are sequentially out of phase by 90 degrees; the fifth control signal is complementary to the first control signal, the sixth control signal is complementary to the second control signal, the seventh control signal is complementary to the third control signal, and the eighth control signal is complementary to the fourth control signal; the first control signal is used to control the opening and closing of the first primary-side switch and the fourth primary-side switch in the first primary-side sub-circuit, and the second control signal is used to control the opening and closing of the second primary-side switch in the second primary-side sub-circuit. The system includes: a primary-side switch and a fourth primary-side switch; a third control signal for controlling the opening and closing of the second and third primary-side switches in the first primary-side sub-circuit; a fourth control signal for controlling the opening and closing of the second and third primary-side switches in the second primary-side sub-circuit; a fifth control signal for controlling the opening and closing of the two second synchronous rectifier switches in the first secondary-side circuit; a sixth control signal for controlling the opening and closing of the two second synchronous rectifier switches in the second secondary-side circuit; a seventh control signal for controlling the opening and closing of the two first synchronous rectifier switches in the first secondary-side circuit; and an eighth control signal for controlling the opening and closing of the two first synchronous rectifier switches in the second secondary-side circuit.

[0021] Preferably, the power conversion device further includes a third secondary circuit and a fourth secondary circuit, each of which includes a first synchronization unit and a second synchronization unit; each synchronization unit includes a common-source first synchronous rectifier switch and a common-source second synchronous rectifier switch; the fifth control signal is used to control the on and off of the two second synchronous rectifier switches in the third secondary circuit, the sixth control signal is used to control the on and off of the two second synchronous rectifier switches in the fourth secondary circuit, the seventh control signal is used to control the on and off of the two first synchronous rectifier switches in the third secondary circuit, and the eighth control signal is used to control the on and off of the two first synchronous rectifier switches in the fourth secondary circuit.

[0022] Another aspect of the present invention provides a single-stage power conversion device, including an input terminal, an output terminal, and a power conversion sub-circuit. The power conversion sub-circuit includes a first primary winding, a second primary winding, a first secondary circuit, a second secondary circuit, and a four-phase inductor. The first secondary circuit includes a first synchronization unit and a second synchronization unit, and the second secondary circuit includes a third synchronization unit and a fourth synchronization unit. Each synchronization unit includes two secondary windings. The first primary winding, the two secondary windings in the first synchronization unit, and the two secondary windings in the second synchronization unit are... Magnetic coupling occurs in the first transformer core; the second primary winding, two secondary windings in the third synchronous unit, and two secondary windings in the fourth synchronous unit are magnetically coupled in the second transformer core; the four-phase inductor encloses four inductor windings, which are coupled in the same inductor core, and these four inductors are the first, second, third, and fourth inductor windings; the first, second, third, and fourth inductor windings are sequentially anti-coupled in pairs; the fourth inductor winding is anti-coupled with the first inductor winding.

[0023] The input terminal includes a positive input terminal and a negative input terminal, and the output terminal includes a positive output terminal and a negative output terminal;

[0024] Each of the aforementioned synchronization units has a positive terminal and a negative terminal; a first inductor winding is connected between the output positive terminal and the positive terminal of the first synchronization unit, and the negative terminal of the first synchronization unit is electrically connected to the output negative terminal; a second inductor winding is connected between the output negative terminal and the negative terminal of the first synchronization unit, and the positive terminal of the second synchronization unit is electrically connected to the output positive terminal; a third inductor winding is connected between the output positive terminal and the positive terminal of the third synchronization unit, and the negative terminal of the third synchronization unit is electrically connected to the output negative terminal; a fourth inductor winding is connected between the output negative terminal and the negative terminal of the fourth synchronization unit, and the positive terminal of the fourth synchronization unit is electrically connected to the output positive terminal;

[0025] The inductor core is disposed between the first transformer core and the second transformer core.

[0026] Preferably, the first synchronization unit includes a first SR combination, the second synchronization unit includes a second SR combination, the third synchronization unit includes a first SR combination, and the fourth synchronization unit includes a second SR combination; each SR combination includes a first synchronous rectifier switch and a second synchronous rectifier switch with a common source; the two secondary windings are a first secondary winding and a second secondary winding, respectively; in each synchronization unit: each source is electrically connected to the negative terminal of the synchronization unit, the drain of the first synchronous rectifier switch is electrically connected to the second terminal of the first secondary winding, and the drain of the second synchronous rectifier switch is electrically connected to the second terminal of the second secondary winding; the first terminals of the first and second secondary windings are both electrically connected to the positive terminal of the unit.

[0027] Preferably, both the first transformer core and the second transformer core include opposing first and third sides, opposing second and fourth sides, two transformer side posts, and transformer winding posts; the third sides of both the first and second transformer cores are located adjacent to the inductor core; the first SR combination of the first synchronization unit is located adjacent to the first side of the first transformer core; the first SR combination of the third synchronization unit is located adjacent to the first side of the second transformer core; the second SR combination of the second synchronization unit is located adjacent to the third side of the first transformer core; and the second SR combination of the fourth synchronization unit is located adjacent to the third side of the second transformer core.

[0028] Preferably, the circuit board further includes an upper and lower surface and a plurality of slots, each slot penetrating the upper and lower surfaces; the plurality of slots include transformer winding post slots; the primary and secondary windings are disposed within and / or on the surface of the circuit board and wound around the corresponding transformer winding post slots; the first and second transformer cores pass through the corresponding slots and are respectively fastened to the circuit board from the upper and lower surfaces; the synchronous rectifier switch is disposed on the upper and / or lower surfaces; the inductor core includes four inductor winding posts and an inductor center post, the four inductor winding posts being disposed around the inductor center post; the plurality of slots include four inductor winding post slots through which the inductor winding posts pass; the four inductor windings are respectively wound around the corresponding inductor winding post slots.

[0029] Preferably, it further includes a first primary-side switch and a combination of second primary-side switches, wherein the first primary-side switch combination is electrically connected to the first primary-side winding, and the second primary-side switch combination is electrically connected to the second primary-side winding; the primary-side switches are disposed on the upper surface of the circuit board, the first primary-side switch combination is disposed adjacent to the first transformer core, and the second primary-side switch combination is disposed adjacent to the second transformer core.

[0030] Preferably, it further includes an output terminal assembly disposed on the lower surface of the circuit board and adjacent to the second side, the fourth side, or the outer side of the first SR assembly.

[0031] Preferably, it further includes a signal terminal assembly, an input terminal, and an input capacitor, wherein the signal terminal assembly, the input terminal, and the input capacitor are disposed on the lower surface of the circuit board, the signal terminal assembly is disposed adjacent to the first SR assembly; the input terminal is disposed adjacent to the inductor core, the input capacitor is disposed adjacent to the input terminal; and the input terminal and the input capacitor are disposed adjacent to the first primary-side switch assembly and the second primary-side assembly.

[0032] Preferably, at least two power conversion sub-circuits are provided; the first primary windings of each power conversion sub-circuit are electrically connected to each other; the second primary windings of each power conversion sub-circuit are electrically connected to each other; the first primary winding of each power conversion sub-circuit, the two secondary windings of the first synchronization unit, and the two secondary windings of the second synchronization unit are magnetically coupled in the first transformer core; the second primary winding of each power conversion sub-circuit, the two secondary windings of the third synchronization unit, and the two secondary windings of the fourth synchronization unit are magnetically coupled in the second transformer core.

[0033] Preferably, in each of the power conversion sub-circuits, the first synchronization unit includes a first SR combination, the second synchronization unit includes a second SR combination, the third synchronization unit includes another first SR combination, and the fourth synchronization unit includes another second SR combination; each SR combination includes a common-source first synchronous rectifier switch and a common-source second synchronous rectifier switch;

[0034] In each of the synchronization units: the two secondary windings are a first secondary winding and a second secondary winding, respectively; the first end of the first secondary winding and the first end of the second secondary winding are short-circuited and electrically connected to the positive terminal of the unit; the second end of the first secondary winding is electrically connected to the drain of the first synchronous rectifier switch, and the second end of the second secondary winding is electrically connected to the drain of the second synchronous rectifier switch; the source of the first synchronous rectifier switch and the source of the second synchronous rectifier switch are short-circuited and electrically connected to the negative terminal of the unit.

[0035] Preferably, the at least two inductor cores are arranged along the x-axis; the first transformer core and the second transformer core each include opposing first and third sides, and opposing second and fourth sides; the third side of the first transformer core and the third side of the second transformer core are both arranged adjacent to the inductor cores;

[0036] The first SR combination of the first synchronization unit, the first transformer core, the second SR combination of the second synchronization unit, the inductor core, the second SR combination of the fourth synchronization unit, the second transformer core, and the first SR combination of the third synchronization unit are arranged sequentially along the y-axis.

[0037] The first transformer core includes two first transformer side posts and at least two first transformer winding posts; the first transformer side posts are disposed on both sides; each power conversion sub-circuit corresponds to one of the first transformer winding posts; the combination of the first primary winding, the secondary winding of the first synchronization unit, and the secondary winding of the second synchronization unit are wound on the corresponding first transformer winding posts;

[0038] The second transformer core encloses two second transformer side posts and at least two second transformer winding posts, with the second transformer side posts located on both sides; each power conversion sub-circuit corresponds to one of the second transformer winding posts; the combination of the second primary winding, the secondary winding of the third synchronization unit, and the secondary winding of the third synchronization unit are wound on the corresponding second transformer winding posts;

[0039] The winding directions of the first primary windings of adjacent power conversion sub-circuits are opposite; the winding directions of the second primary windings of adjacent power conversion sub-circuits are opposite.

[0040] Preferably, the circuit board further includes an upper and lower surface and a plurality of slots, each slot penetrating the upper and lower surfaces; the plurality of slots includes at least four transformer winding post slots; the primary winding and secondary winding are both disposed within and / or on the surface of the circuit board, and the primary winding and secondary winding are respectively wound around the corresponding transformer winding post slots; the first transformer core and the second transformer core both pass through the corresponding slots and are respectively fastened to the circuit board from the upper and lower surfaces; the synchronous rectifier switch is disposed on the upper and / or lower surfaces; each inductor core includes four inductor winding posts and an inductor center post, the plurality of slots includes at least eight inductor winding post slots, and the four inductor windings in each inductor core are respectively wound around the corresponding inductor winding post slots.

[0041] Preferably, it further includes a first primary-side switch combination and a second primary-side switch combination; the first primary-side windings of the at least two power conversion sub-circuits are connected in series and electrically connected to the first primary-side switch combination; the second primary-side windings of the at least two power conversion sub-circuits are connected in series and electrically connected to the second primary-side switch combination; the at least two power conversion sub-circuits share the same first transformer core, and the at least two power conversion sub-circuits share the same second transformer core; the first primary-side switch combination and the second primary-side switch combination are arranged adjacent to the same side of the first transformer core and the second transformer core.

[0042] Preferably, the first secondary circuit in the adjacent power conversion sub-circuit is configured with a mirror-symmetric device layout; the second secondary circuit in the adjacent power conversion sub-circuit is configured with a mirror-symmetric device layout.

[0043] Preferably, it further includes an output terminal assembly disposed on the lower surface of the circuit board; a portion of the output terminal assembly is disposed adjacent to the second and fourth sides of each of the inductor cores, and another portion of the output terminal assembly is disposed adjacent to the first SR assembly.

[0044] Preferably, it further includes a signal terminal assembly, an input terminal, and an input capacitor, wherein the signal terminal assembly, the input terminal, and the input capacitor are disposed on the lower surface of the circuit board, the signal terminal assembly is disposed adjacent to the first SR assembly; the input terminal is disposed adjacent to the inductor core, the input capacitor is disposed adjacent to the input terminal; and the input terminal and the input capacitor are disposed adjacent to the first primary-side switch assembly and the second primary-side assembly.

[0045] Preferably, in adjacent power conversion sub-circuits, synchronous rectifier switches in mirror-symmetrical positions are controlled by the same control signal.

[0046] Preferably, it also includes an adapter board; the SR assembly is arranged symmetrically on the upper and lower surfaces of the circuit board; the adapter board is located below the circuit board; the adapter board is used for rewiring the input and output terminals.

[0047] The beneficial effects of this invention are:

[0048] (1) This invention proposes a power conversion circuit with high power requirements. The primary circuit adopts a parallel architecture of two full-bridge circuits, and the secondary circuit adopts N synchronous rectification units and N inductors, where N is a natural number that is a multiple of 4.

[0049] By innovating the component layout, the four inductors are anti-coupled, reducing the size of the inductor assembly and improving dynamic performance.

[0050] (2) On the other hand, since the transformer and inductor are designed independently, the secondary winding of the transformer adopts a half-turn structure, which greatly reduces the length of the transformer winding, thereby obtaining a lower on-resistance and improving the conversion efficiency of the power conversion device. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of a power conversion circuit;

[0053] Figure 2 This refers to the control timing of the power conversion circuit;

[0054] Figures 3A to 3C This is a schematic diagram of the primary and secondary windings in Example 1.

[0055] Figure 4A and Figure 4B This is a schematic diagram of the primary and secondary windings in Example 2;

[0056] Figure 5A This is a schematic diagram of the top surface of the power conversion device;

[0057] Figure 5B This is a schematic diagram of the bottom surface of the power conversion device;

[0058] Figures 6A to 6D This is a three-dimensional schematic diagram and an exploded schematic diagram of a power conversion device. Detailed Implementation

[0059] One of the core aspects of this invention is to provide a power conversion circuit and a power conversion device.

[0060] This invention proposes a power conversion circuit that meets high power requirements. The primary circuit adopts a parallel architecture of two sets of full-bridge circuits, while the secondary circuit uses N synchronous rectification units and N inductors, where N is a natural number that is a multiple of 4. The four inductors are anti-coupled within the same inductor core, reducing the size of the inductor components. Furthermore, this invention proposes a power conversion device that, through component layout, achieves anti-coupling of the four inductors, improving the dynamic response speed to the load, reducing parasitic losses in the power conversion device, and meeting high power output requirements while improving the conversion efficiency of the power conversion device.

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Example 1

[0063] This invention proposes a single-stage power conversion circuit, such as... Figure 1 As shown, the power conversion circuit includes an input positive terminal Vin+, an input negative terminal Vin-, an output positive terminal Vo+, an output negative terminal Vo-, a primary-side circuit, and a secondary-side circuit. In this embodiment, the input negative terminal Vin- and the output negative terminal Vo- are short-circuited. The primary-side circuit uses two primary-side sub-circuits connected in parallel. The secondary-side circuit includes a first secondary-side circuit and a second secondary-side circuit connected in parallel. Both the first and second secondary-side circuits use a parallel architecture of multiple sets of center-tapped synchronous rectifier circuits connected in parallel. Each primary-side sub-circuit includes four primary-side switches, a DC blocking capacitor, and a primary-side winding; each primary-side sub-circuit is connected across the input positive terminal and the input negative terminal; every two primary-side switches are connected in series to form a switch bridge arm; the DC blocking capacitor and the primary-side winding are connected in series across the midpoint of the two bridge arms. The secondary circuit includes four synchronous rectifier units (referred to as synchronous units) and four inductors. Each synchronous unit includes two synchronous rectifier switches and two secondary windings. Each synchronous unit is connected in series with an inductor and then connected in parallel, bridging the positive and negative output terminals. In another embodiment, the DC blocking capacitor may be omitted, and the two ends of the primary winding are directly connected between the midpoints of the two bridge arms. In this embodiment, each primary sub-circuit is a full-bridge circuit. In another embodiment, a switching bridge arm can also be a capacitor bridge arm, which includes two primary capacitors connected in series. The DC blocking capacitor is connected in series with the primary winding and then bridging the midpoint of the switching bridge arm and the midpoint of the capacitor bridge arm.

[0064] Detailed reference Figure 1As shown, the first primary-side sub-circuit includes a first switching bridge arm, a second switching bridge arm, a DC blocking capacitor C1, and a primary winding T1a. The first switching bridge arm includes primary switches Q1 and Q2, which are connected in series at the midpoint of the bridge arm. The second switching bridge arm includes primary switches Q3 and Q4, which are connected in series at the midpoint of the bridge arm. The DC blocking capacitor C1 and the primary winding T1a are connected in series across the midpoints of the two bridge arms. The first end of the primary winding T1a is electrically connected to the midpoint of the first switching bridge arm via the DC blocking capacitor C1, and the second end is electrically connected to the midpoint of the second switching bridge arm. The second primary-side sub-circuit includes a first switching bridge arm, a second switching bridge arm, a DC blocking capacitor C2, and a primary winding T2a. The first switch bridge arm includes primary-side switches Q9 and Q10, which are connected in series at the midpoint of the first switch bridge arm. The second switch bridge arm includes primary-side switches Q11 and Q12, which are connected in series at the midpoint of the second switch bridge arm. The connection method of the second primary-side sub-circuit is the same as that of the first primary-side sub-circuit. The DC blocking capacitor C2 and the primary-side winding T2a are connected in series across the midpoints of the first and second switch bridge arms. The first end of the primary-side winding T2a is electrically connected to the midpoint of the first switch bridge arm via the DC blocking capacitor C2, and its second end is electrically connected to the midpoint of the second switch bridge arm.

[0065] The first secondary circuit includes a first synchronization unit SRU1, a second synchronization unit SRU2, inductors L1 and L2. The first synchronization unit SRU1 includes a positive terminal, a negative terminal, a first SR combination (i.e., synchronous rectifier switches Q5 and Q6, hereinafter referred to as the first SR combination), and secondary windings T1b and T1c. The sources of synchronous rectifier switches Q5 and Q6 are electrically connected to the negative terminal of the unit and to the negative output terminal. The drain of synchronous rectifier switch Q5 is electrically connected to the second terminal of the secondary winding T1b, and the drain of synchronous rectifier switch Q6 is electrically connected to the second terminal of the secondary winding T1c. The first terminals of the secondary windings T1b and T1c are electrically connected to the positive terminal of the unit. Inductor L1 is connected between the positive terminal of the unit and the positive output terminal Vo+; the first terminal of inductor L1 is short-circuited to the positive terminal of the unit, and the second terminal of inductor L1 is short-circuited to the positive output terminal Vo+. The second synchronization unit SRU2 includes a positive terminal, a negative terminal, a second SR combination (i.e., synchronous rectifier switches Q7 and Q8), and secondary windings T1d and T1e. The sources of synchronous rectifier switches Q7 and Q8 are electrically connected to the negative terminal of the unit; the drain of synchronous rectifier switch Q7 is electrically connected to the second terminal of secondary winding T1d, and the drain of synchronous rectifier switch Q8 is electrically connected to the second terminal of secondary winding T1e; the first terminals of secondary windings T1d and T1e are both electrically connected to the positive terminal of the unit and to the positive output terminal Vo+. Inductor L2 is connected between the negative terminal of the unit and the negative output terminal Vo-; the first terminal of inductor L2 is short-circuited to the negative terminal of the unit, and the second terminal of inductor L2 is short-circuited to the negative output terminal Vo-.

[0066] The second secondary circuit includes a first synchronization unit SRU1, a second synchronization unit SRU2, inductors L3 and L4. The first synchronization unit SRU1 includes a positive terminal, a negative terminal, a first SR combination (i.e., synchronous rectifier switches Q13 and Q14), and secondary windings T2b and T2c. The sources of synchronous rectifier switches Q13 and Q14 are electrically connected to the negative terminal of the unit and to the negative output terminal. The drain of synchronous rectifier switch Q13 is electrically connected to the second terminal of secondary winding T2b, and the drain of synchronous rectifier switch Q13 is electrically connected to the second terminal of secondary winding T2c. The first terminals of secondary windings T2b and T2c are electrically connected to the positive terminal of the unit. Inductor L3 is connected between the positive terminal of the unit and the positive output terminal Vo+; the first terminal of inductor L3 is short-circuited to the positive terminal of the unit, and the second terminal of inductor L3 is short-circuited to the positive output terminal Vo+. The second synchronization unit SRU2 includes a positive terminal, a negative terminal, a second SR combination (i.e., synchronous rectifier switches Q15 and Q16), and secondary windings T2d and T2e. The sources of synchronous rectifier switches Q15 and Q16 are electrically connected to the negative terminal of the unit; the drain of synchronous rectifier switch Q15 is electrically connected to the second terminal of secondary winding T2d, and the drain of synchronous rectifier switch Q16 is electrically connected to the second terminal of secondary winding T2e; the first terminals of secondary windings T2d and T2e are both electrically connected to the positive terminal of the unit and to the positive output terminal Vo+. Inductor L4 is connected between the negative terminal of the unit and the negative output terminal Vo-; the first terminal of inductor L4 is short-circuited to the negative terminal of the unit, and the second terminal of inductor L4 is short-circuited to the negative output terminal Vo-.

[0067] In the power conversion circuit disclosed in this embodiment, the primary winding T1a is coupled with the secondary windings T1b, T1c, T1d, and T1e to form an ideal transformer. The first end of the primary winding T1a, the first end of the secondary winding T1b, the second end of T1c, the first end of the secondary winding T1d, and the second end of the secondary winding T1e are terminals of the same name, labeled as point terminals. The primary winding T2a is coupled with the secondary windings T2b, T2c, T2d, and T2e to form an ideal transformer. The first end of the primary winding T2a, the first end of the secondary winding T2b, the second end of the secondary winding T2c, the first end of the secondary winding T2d, and the second end of the secondary winding T2e are terminals of the same name, labeled as point terminals. Inductors L1, L2, L3, and L4 are anti-coupled in pairs. The first terminal of inductor L1, the second terminal of inductor L2, the first terminal of inductor L3, and the second terminal of inductor L4 are terminals with the same name, and are labeled as point terminals.

[0068] Figure 2The diagram shows the control timing corresponding to the power conversion circuit. The power conversion circuit uses eight control signals: PWM1, PWM2, PWM3, PWM4, PWM5, PWM6, PWM7, and PWM8. The duty cycles (i.e., the duty cycles of the power conversion circuit) of the four control signals PWM1, PWM2, PWM3, and PWM4 are equal, and these four control signals are sequentially out of phase by 90 degrees. PWM1 controls the on / off state of primary-side switches Q1 and Q4; PWM2 controls the on / off state of primary-side switches Q9 and Q12; PWM3 controls the on / off state of primary-side switches Q2 and Q3; and PWM4 controls the on / off state of primary-side switches Q10 and Q11. Ignoring the dead time between control signals, the fifth control signal PWM5 is complementary to the first control signal PWM1 and is used to control the switching on and off of synchronous rectifier switches Q6 and Q8; the sixth control signal PWM6 is complementary to the second control signal PWM2 and is used to control the switching on and off of synchronous rectifier switches Q14 and Q16; the seventh control signal PWM7 is complementary to the third control signal PWM3 and is used to control the switching on and off of synchronous rectifier switches Q5 and Q7; the eighth control signal PWM8 is complementary to the fourth control signal PWM4 and is used to control the switching on and off of synchronous rectifier switches Q13 and Q15. In this embodiment, the duty cycle is any value between 0 and 0.5, and the magnitude of the duty cycle can be adjusted by the control element according to the output voltage.

[0069] The power conversion device disclosed in this invention employs, as follows: Figure 1 The circuit topology shown and as Figure 2 The control timing is shown. In this embodiment, the power conversion device includes a first transformer assembly 10, a second transformer assembly 20, and an inductor assembly 30, as shown. Figure 3A and Figure 3B As shown, Figure 3A This refers to the winding method of the primary winding and its connection method with the primary switch; Figure 3B This describes the winding method of the secondary winding and its connection method with the synchronous rectifier switch, as well as the winding method and connection method of the inductor winding. The inductor assembly 30 is positioned between the two transformer assemblies, and the primary-side switch is positioned on the same side of both transformer assemblies.

[0070] The first transformer assembly 10 includes a first transformer core, a primary winding T1a, and secondary windings T1b / T1c / T1d / T1e. The first transformer core includes transformer side posts 11 and 12 and a transformer winding post 13. The first transformer core is an E-shaped core, also including opposing first and third sides 101 and 103, and opposing second and fourth sides 102 and 104, with the second side 102 located to the left of the third side 103 and the fourth side 104 located to the right of the third side 103. (Refer to...) Figure 3A As shown, the first and second ends of the primary winding T1a are both located near the third side 103 of the first transformer core, with the first end near the transformer side post 11 and the second end near the transformer side post 12. The primary winding T1a is wound N turns around the transformer winding post 13 from the first end to the second end along a first direction (clockwise in this embodiment). (Refer to...) Figure 3B As shown, the first ends of both secondary windings T1b and T1c are located near the third side 103 of the first transformer core, and the second ends of both secondary windings T1b and T1c are located near the first side 101 of the first transformer core. Secondary winding T1b passes sequentially from its first end to its second end through the third side 103, the channel between the transformer side post 11 and the transformer winding post 13, and the first side 101 (i.e., along the third direction); secondary winding T1c passes sequentially from its first end to its second end through the third side 103, the channel between the transformer side post 12 and the transformer winding post 13, and the first side 101 (i.e., along the third direction). The first ends of both secondary windings T1d and T1e are located near the first side 101 of the first transformer core, and the second ends of both secondary windings T1d and T1e are located near the third side 103 of the first transformer core. The secondary winding T1d passes sequentially from the first end to the second end through the channel between the first side 101, the transformer side post 12, and the transformer winding post 13, and the third side 103 (i.e., along the fourth direction); the secondary winding T1e passes sequentially from the first end to the second end through the channel between the first side 101, the transformer side post 11, and the transformer winding post 13, and the third side 103 (i.e., along the fourth direction). In this embodiment, the secondary windings T1b / T1c / T1d / T1e are each wound half a turn around the transformer winding post 13. Therefore, in the first transformer assembly, the turns ratio of the primary winding to the secondary winding is 2*N:1:1:1:1. Compared with conventional transformers, under the condition of obtaining the same turns ratio, the number of turns of the primary and secondary windings in this embodiment is halved, thereby effectively reducing the copper losses generated on the transformer windings and further improving the conversion efficiency of the power conversion device. Here, the first direction is opposite to the second direction, and the third direction is opposite to the fourth direction.

[0071] Similarly, the second transformer assembly 20 includes a second transformer core, a primary winding T2a, and secondary windings T2b / T2c / T2d / T2e. The second transformer core is an E-shaped core, including transformer side posts 21 and 22 and a transformer winding post 23. The second transformer core also includes opposing first side 201 and third side 203, and opposing second side 202 and fourth side 204; the second side 202 is located to the left of the third side 203, and the fourth side 204 is located to the right of the third side 203. The third side 203 of the second transformer core is opposite to and adjacent to the third side 103 of the first transformer core; from top to bottom, the order is: first side 101 of the first transformer core, third side 103 of the first transformer core, third side 203 of the second transformer core, and first side 201. (Refer to...) Figure 3A As shown, the first and second ends of the primary winding T2a are both located near the third side 203 of the second transformer core, with the first end near the transformer side post 21 and the second end near the transformer side post 22. The primary winding T1a is wound N turns around the transformer winding post 23 from the first end to the second end along a second direction (in this embodiment, the second direction is counterclockwise). (Transformer reference...) Figure 3BAs shown, the first ends of secondary windings T2b and T2c are both located near the third side 203 of the second transformer core, and the second ends of secondary windings T2b and T2c are both located near the first side 201 of the second transformer core. Secondary winding T2b passes sequentially from its first end to its second end through the channel between the third side 203, the side post 21, and the transformer winding post 23, as well as the first side 201 (i.e., along the fourth direction); secondary winding T2c passes sequentially from its first end to its second end through the channel between the third side 203, the transformer side post 22, and the transformer winding post 23, as well as the first side 201 (i.e., along the fourth direction). The first ends of secondary windings T2d and T2e are both located near the first side 201 of the second transformer core, and the second ends of secondary windings T2d and T2e are both located near the third side 203 of the second transformer core. The secondary winding T2d passes sequentially from the first end to the second end through the channel between the first side 201, the transformer side post 22, and the transformer winding post 23, as well as the third side 203 (i.e., along the third direction). The secondary winding T2e passes sequentially from the first end to the second end through the channel between the first side 201, the transformer side post 21, and the transformer winding post 23, as well as the third side 203 (i.e., along the third direction). In this embodiment, the secondary windings T2b / T2c / T2d / T2e are each wound half a turn around the transformer winding post 23. Therefore, in the second transformer assembly, the turns ratio of the primary winding to the secondary winding is 2*N:1:1:1:1. Compared with conventional transformers, under the condition of obtaining the same turns ratio, the number of turns of the primary and secondary windings in this embodiment is halved, thereby effectively reducing the copper losses generated on the transformer windings and further improving the conversion efficiency of the power conversion device. Here, the first direction is opposite to the second direction, and the third direction is opposite to the fourth direction.

[0072] In this embodiment, the positive terminal of the first synchronization unit SRU1 is electrically connected to the positive output terminal Vo+ via an inductor, and its negative terminal is directly electrically connected to the negative output terminal Vo-. Similarly, the positive terminal of the second synchronization unit SRU2 is directly connected to the positive output terminal Vo+, and its negative terminal is connected to the negative output terminal Vo- via an inductor. Therefore, the positive terminals of both the first and second synchronization units are located adjacent to the inductor assembly 30. This layout facilitates the integration of four inductor windings L1 / L2 / L3 / L4 into the same inductor assembly, enabling anti-coupling of the four inductors in the secondary circuit using only one inductor core.

[0073] Reference Figure 3BAs shown, from top to bottom, the components are: the first SR assembly of the first secondary circuit, the first transformer assembly, the second SR assembly, the inductor assembly (containing four inductor windings L1 / L2 / L3 / L4), the second SR assembly of the second secondary circuit, the second transformer assembly, and the first SR assembly. The inductor assembly 30 includes an inductor core and inductor windings L1 / L2 / L3 / L4. The inductor core is a five-limb core, including four inductor winding limbs 31 / 32 / 33 / 34 and an inductor center post 35, wherein the four inductor winding limbs 31 / 32 / 33 / 34 are arranged around the inductor center post 35. The inductor core includes opposing first sides 301 and third sides 303, and opposing second sides 302 and fourth sides 304; the second side 302 is located to the left of the first side 301, and the fourth side 304 is located to the right of the first side 301. The first side 301 of the inductor core is adjacent to the third side 103 of the first transformer core, and the third side 303 of the inductor core is adjacent to the third side 203 of the second transformer core. The first ends of inductor windings L1 and L2 are both located adjacent to the first side 301 of the inductor core; the second end of inductor winding L1 is located adjacent to the fourth side 304 and is electrically connected to the positive output terminal Vo+; the second end of inductor winding L2 is located adjacent to the second side 302 and is electrically connected to the negative output terminal Vo-. The first ends of inductor windings L3 and L4 are both located adjacent to the third side 303 of the inductor core; the second end of inductor winding L3 is located adjacent to the second side 302 and is electrically connected to the positive output terminal Vo+; the second end of inductor winding L4 is located adjacent to the fourth side 304 and is electrically connected to the negative output terminal Vo-. Inductor windings L1 / L2 / L3 / L4 pass through the channels between winding posts 31 / 32 / 33 / 34 and the center post from the first end, reaching the second end, thus winding one turn around the inductor winding posts 31 / 32 / 33 / 34. Since the DC current flows in from the point end, the DC magnetic flux generated on each winding post flows out of the paper; this DC magnetic flux direction is defined as positive. Therefore, the DC magnetic flux direction on each inductor winding post is the same, thus achieving the anti-coupling relationship of the four inductors. The voltage UL across the inductor is defined as the point-end voltage minus the non-point-end voltage. The voltage UL1 across inductor winding L1 is equal to the voltage UL2 across inductor winding L2, and the voltage UL3 across inductor winding L3 is equal to the voltage UL4 across inductor winding L4. Furthermore, UL1 and UL3 are 180 degrees out of phase. Figure 3C As shown. Therefore, on the inductor column 35, the DC magnetic flux is superimposed and the AC magnetic flux is subtracted, resulting in a larger steady-state inductance and a smaller dynamic inductance.

[0074] Example 2

[0075] To meet the high current demands of the load, the power conversion device needs to further increase its output power. In this embodiment, the increased output power can be achieved by adding a first secondary circuit and a second secondary circuit, and by adding one winding post to each transformer core. Details are as follows... Figure 4A and Figure 4B As shown. Transformer assembly 10 includes transformer side posts 11 and 12, and transformer winding posts 13 and 14. The first end of the primary winding T1a is located adjacent to transformer side post 11, and the second end is located adjacent to transformer side post 12. From the first end to the second end, N turns are first wound around transformer winding post 13 in a first direction, and then N turns are wound around transformer winding post 14 in a second direction. Similarly, transformer assembly 20 includes transformer side posts 21 and 22, and transformer winding posts 23 and 24. The winding method of the primary winding T2a is similar to that of the primary winding T1a. The first end of the primary winding T2a is located adjacent to transformer side post 21, and the second end is located adjacent to transformer side post 22. From the first end to the second end, N turns are first wound around transformer winding post 23 in a second direction, and then N turns are wound around transformer winding post 24 in a first direction.

[0076] Reference Figure 4BAs shown, the winding method of the secondary windings T1b / T1c / T1d / T1e is the same as in Embodiment 1. The newly added first set of secondary circuits includes secondary windings T3b / T3c / T3d / T3e. The secondary windings T3b / T3c / T3d / T3e are wound half a turn around the transformer winding post 14 in a similar manner and are coupled to the primary winding wound on the transformer winding post 14. The first ends of the secondary windings T3b and T3c are both located near the third side 103 of the first transformer core and are shorted to the positive terminal of the first synchronization unit SRU1, which is electrically connected to the first end of the output inductor L1b; the second ends of the secondary windings T3b and T3c are both located near the first side 101 of the first transformer core. The secondary winding T3b passes sequentially from the first end to the second end through the third side 103, the channel between the transformer winding post 14 and the transformer side post 12, and the first side 101 (i.e., along the third direction); the secondary winding T3c passes sequentially from the first end to the second end through the third side 103, the channel between the transformer winding posts 13 and 14, and the first side 101 (i.e., along the third direction). The first ends of the secondary windings T3d and T3e are both located adjacent to the first side 101 of the first transformer core and are short-circuited to form the positive terminal of the second synchronization unit SRU2, i.e., the positive output terminal Vo+; the second ends of the secondary windings T3d and T3e are both located adjacent to the third side 103 of the first transformer core. The secondary winding T3d passes sequentially from the first end to the second end through the first side 101, the channel between transformer winding posts 13 and 14, and the third side 103 (i.e., along the fourth direction); the secondary winding T3e passes sequentially from the first end to the second end through the first side 101, the channel between transformer side post 12 and transformer winding post 14, and the third side 103 (i.e., along the fourth direction). Similarly, the second transformer assembly also includes transformer winding post 24 and secondary windings T4b / T4c / T4d / T4e, and its structure and winding method are similar to those of the first transformer assembly in this embodiment, achieving similar technical effects, and will not be described in detail here.

[0077] The newly added first secondary circuit includes new synchronous rectifier switches Q17 / Q18 / Q19 / Q20. The sources of synchronous rectifier switches Q17 / Q18 / Q19 / Q20 are shorted to the second terminals of the secondary windings T3c / T3b / T3d / T3e, respectively. The sources of Q17 and Q18 are shorted to the negative terminal of the first synchronous unit SRU1, which is shorted to the negative terminal of the output. The sources of Q19 and Q20 are shorted to the negative terminal of the second synchronous unit SRU2, which is shorted to the first terminal of the output inductor L2b. The newly added second secondary circuit includes synchronous rectifier switches Q21 / Q22 / Q23 / Q24. The drains of synchronous rectifier switches Q21 / Q22 / Q23 / Q24 are shorted to the second terminals of secondary windings T4c / T4b / T4d / T4e, respectively. The sources of Q23 and Q24 are shorted to the negative terminal of the first synchronous unit SRU1, that is, shorted to the output negative terminal. The sources of Q21 and Q22 are shorted to the negative terminal of the second synchronous unit SRU2, that is, shorted to the first terminal of the output inductor L4b. In the first secondary circuit, synchronous rectifier switches Q5 / Q18 in the first SR combination and synchronous rectifier switches Q7 / Q19 in the second SR combination are controlled by the same control signal; synchronous rectifier switches Q6 / Q17 in the first SR combination and synchronous rectifier switches Q8 / Q20 in the second SR combination are controlled by the same control signal. In the second secondary circuit, the synchronous rectifier switches Q13 / Q24 in the first SR combination and Q15 / Q21 in the second SR combination are controlled by the same control signal; the synchronous rectifier switches Q14 / Q23 in the first SR combination and Q16 / Q22 in the second SR combination are controlled by the same control signal.

[0078] The output inductors of the newly added first secondary circuit and the newly added second secondary circuit are integrated into one inductor component 30b. Figure 4B In this embodiment, the winding method of inductor component 30a is the same as that of inductor component 30 in Embodiment 1. Inductor component 30b and inductor component 30a are arranged symmetrically along the Y-axis. Inductor windings L1a / L2a / L3a / L4a are wound half a turn around inductor winding posts 31a / 32a / 33a / 34a respectively; inductor windings L1b / L2b / L3b / L4b are wound half a turn around inductor winding posts 31b / 32b / 33b / 34b respectively. However, the layout of inductor components 30a and 30b is not limited to a symmetrical layout along the Y-axis. They can also adopt the same translational layout, as long as some modifications are made according to the output end set on the second or fourth side of the inductor component.

[0079] The layout of the power conversion device shown in this embodiment is as follows: Figure 5A and Figure 5B As shown, Figure 5AThis is a schematic diagram of the top layout of the power conversion device. Figure 5B This is a schematic diagram of the bottom layout of a power conversion device. The power conversion device includes a circuit board 1, which has an upper surface 1-1 and a lower surface 1-2. (See diagram below.) Figure 5A As shown, you can refer to the following: Figure 6C and Figure 6D Inductor components 30a and 30b are disposed in the central region of the circuit substrate 1 and are arranged along the x-axis. Inductor windings are disposed within or on the surface of the circuit substrate 1. The circuit substrate 1 also includes multiple slots through which inductor winding posts and center posts pass, and inductor cores are fastened to the circuit substrate 1 from the upper surface 1-1 and the lower surface 1-2, respectively. These multiple slots include inductor winding post slots, and each inductor winding is wound around one inductor winding post slot. Along the y-axis, transformer components 10 and 20 are disposed on opposite sides of the circuit substrate. Primary and secondary windings are disposed within or on the surface of the circuit substrate 1. Multiple slots through which transformer winding posts and transformer center posts pass, and transformer cores are fastened to the circuit substrate 1 from the upper surface 1-1 and the lower surface 1-2, respectively. These multiple slots include transformer winding post slots, and the primary and secondary windings are wound around the corresponding transformer winding post slots. The first SR combination 111 of the first secondary circuit (including synchronous rectifier switches Q5 / Q6 / Q17 / Q18) is disposed adjacent to the first side 101 of the transformer assembly 10. The second SR combination 112 of the first secondary circuit (including synchronous rectifier switches Q8 / Q7 / Q19 / Q20) is disposed adjacent to the third side 103 of the transformer assembly 10; and the second SR combination 112 is disposed between the transformer assembly 10 and the inductor assemblies 30a / 30b. The first SR combination 113 of the second secondary circuit (including synchronous rectifier switches Q13 / Q14 / Q23 / Q24) is disposed adjacent to the first side 201 of the transformer assembly 20. The second SR combination 114 of the second secondary circuit (including synchronous rectifier switches Q16 / Q15 / Q21 / Q22) is disposed adjacent to the third side 203 of the transformer assembly 20; and the second SR combination 114 is disposed between the transformer assembly 20 and the inductor assemblies 30a / 30b. The primary-side switch assembly 115 (including Q1 / Q2 / Q3 / Q4) is disposed adjacent to the second side 102 of the transformer assembly 10, and the primary-side switch assembly 116 (including Q9 / Q10 / Q11 / Q12) is disposed adjacent to the second side 202 of the transformer assembly 20 and the second side of the inductor assembly 30a. In other words, the first SR assembly of the first secondary-side circuit, the first transformer core, the second SR assembly of the first secondary-side circuit, the inductor core, the second SR assembly of the second secondary-side circuit, the second transformer core, and the first SR assembly of the second secondary-side circuit are arranged sequentially along the y-axis direction.

[0080] like Figure 5BAs shown, on the lower surface 1-2 of the circuit board 1, the layout of the inductor components 30a / 30b, transformer components 10 and 20 is the same as that on the upper surface 1-1. Similarly, the first SR combination 211 of the first secondary circuit (including synchronous rectifier switches Q5 / Q6 / Q17 / Q18) is arranged adjacent to the first side 101 of the transformer component 10; the synchronous rectifier switches in the first SR combination 211 and the synchronous rectifier switches in the first SR combination 111 on the upper surface 1-1 are aligned vertically and connected in parallel. The second SR combination 212 (including synchronous rectifier switches Q8 / Q7 / Q19 / Q20) of the first secondary circuit is disposed adjacent to the third side 103 of the transformer assembly 10; and the second SR combination 212 is disposed between the transformer assembly 10 and the inductor assemblies 30a / 30b; the synchronous rectifier switches in the second SR combination 212 are vertically aligned with the synchronous rectifier switches in the second SR combination 112 on the upper surface 1-1 and are connected in parallel. The first SR combination 213 (including synchronous rectifier switches Q13 / Q14 / Q23 / Q24) of the second secondary circuit is disposed adjacent to the first side 201 of the transformer assembly 20; the synchronous rectifier switches in the first SR combination 213 are vertically aligned with the synchronous rectifier switches in the first SR combination 113 on the upper surface 1-1 and are connected in parallel. The second SR combination 214 (including synchronous rectifier switches Q16 / Q15 / Q21 / Q22) of the second secondary circuit is arranged adjacent to the third side 203 of the transformer assembly 20; and the second SR combination 214 is arranged between the transformer assembly 20 and the inductor assemblies 30a / 30b; the synchronous rectifier switches in the second SR combination 214 and the synchronous rectifier switches in the second SR combination 114 on the upper surface 1-1 are aligned vertically and connected in parallel. In this embodiment, the output terminal combination 220 includes a pair of positive output terminals Vo+ and negative output terminals Vo-. The output terminal combination 220 is arranged between and on the outside of the core assemblies 30a and 30b, that is, along the x-axis direction, in the order of output terminal combination 220, core assembly 30a, output terminal combination 220, core assembly 30b, and output terminal combination 220. Output terminal assembly 221 is disposed adjacent to the first SR assembly 211, and the first SR assembly 211 is disposed between the output terminal assembly 221 and the transformer assembly 10; output terminal assembly 222 is disposed adjacent to the first SR assembly 213, and the first SR assembly 213 is disposed between the output terminal assembly 222 and the transformer assembly 20. Output terminal assemblies 221 and 222 include a positive output terminal Vo+ and a negative output terminal Vo-, and the positive output terminal Vo+ and the negative output terminal Vo- are arranged alternately. In this embodiment, they are arranged sequentially in the order of positive output terminal Vo+, negative output terminal Vo-, positive output terminal Vo+, negative output terminal Vo-, and positive output terminal Vo+.However, the number and arrangement of output terminals are not limited to this; as long as multiple terminals are arranged alternately with the positive output terminal Vo+ and the negative output terminal Vo-, it is acceptable. Signal terminal combination 131 is positioned adjacent to output terminal combination 221, and signal terminal combination 132 is positioned adjacent to output terminal combination 222. The positive input terminal Vin+ is positioned adjacent to the second side of inductor component 30a, and the input capacitor Cin is positioned between the positive input terminal Vin+ and output terminal combination 220.

[0081] In this embodiment, in order to couple the inductor windings within the same inductor core, the first SR combination, transformer assembly, and second SR combination in the first secondary circuit are symmetrically placed on both sides of the inductor assembly, along with the first SR combination, transformer assembly, and second SR combination in the second secondary circuit.

[0082] The circuit topology shown in Example 1 can also adopt the layout structure shown in Example 2, simply by removing the corresponding components and adding transformer winding posts. Similarly, based on Example 2, secondary circuits and transformer winding posts can be added according to the same connection method and layout rules to meet greater output power requirements.

[0083] The power conversion device disclosed in this invention also includes a capacitor adapter plate 2, such as... Figures 6A to 6D As shown. Figure 6A This is a three-dimensional top view of the power conversion device. Figure 6B This is a three-dimensional schematic diagram of the bottom surface of the power conversion device. Figure 6C This is an exploded top view of the power conversion device. Figure 6D This is an exploded view of the bottom surface of the power conversion device. The capacitor plate 2 includes an upper surface 2-1 and a lower surface 2-2. A control element 250 is disposed on the upper surface 2-1. The control element can be a control chip or an MCU. In this embodiment, the control element 250 is an MCU. The control element 250 is disposed near the signal terminals 131 / 132. Output capacitors Co can be disposed at other positions on the upper surface 2-1 according to actual needs. The number, capacitance, size, or placement of the output capacitors can be designed according to actual needs. (Refer to...) Figure 6D As shown, the heights of the output terminal combination 220 / 221 / 222, the signal terminal 131 / 132, and the positive input terminal Vin+ are all greater than the height of the switching element, or all greater than the height of the transformer core substrate, or all greater than the height of the inductor core substrate; furthermore, the heights of the output terminal combination 220 / 221 / 222, the signal terminal 131 / 132, and the positive input terminal Vin+ are greater than or equal to the sum of the height of the switching element and the height of the output capacitor Co, or all greater than or equal to the sum of the height of the transformer core substrate and the height of the output capacitor, or all greater than or equal to the sum of the height of the inductor core substrate and the height of the output capacitor.

[0084] The lower surface of capacitor adapter board 2 is designed with a BGA array. The BGA array is electrically connected to the pads on the upper surface 2-1 through internal wiring or vias of capacitor adapter board 2. The BGA array is used to transmit input / output power, some control signals, or sampling signals. The pins in the BGA array include positive input pins, negative input pins, positive output pins, and signal pins. The layout of the BGA array can be designed according to actual needs to meet the requirements of different customers.

[0085] The switching transistor disclosed in this invention can be a SiMOSFET, SiCMOSFET, GaNMOSFET, or IGBTMOSFET, etc., all of which can realize the switching function disclosed in this invention.

[0086] The power module described in the above embodiments can also be part of an electronic device, as long as it meets the technical features and benefits disclosed in this invention.

[0087] The terms "equal," "identical," or "equal to" disclosed in this invention must take into account the parameter distribution of the engineering process, with an error distribution within ±30%. "Parallel" is defined as the angle between two line segments or lines being less than or equal to 45 degrees. "Perpendicular" is defined as the angle between two line segments or lines being within the range of [60, 120] degrees. The definition of "phase misalignment" also needs to consider the parameter distribution of the engineering process, with an error distribution of the phase misalignment degree within ±30%.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-stage power conversion device, characterized by, The input positive terminal, the input negative terminal, the output positive terminal, the output negative terminal, the primary side circuit and the secondary side circuit are included. The primary side circuit includes the first primary side sub-circuit and the second primary side sub-circuit connected in parallel, and the secondary side circuit includes the first secondary side sub-circuit and the second secondary side sub-circuit connected in parallel, wherein the first secondary side sub-circuit and the second secondary side sub-circuit both include the synchronization unit and the inductor, the synchronization unit includes the first synchronization unit and the second synchronization unit, and the inductor includes the first inductor and the second inductor. Each of the synchronization units includes the unit positive terminal and the unit negative terminal, the first inductor is connected between the unit positive terminal and the output positive terminal, and the second inductor is connected between the unit negative terminal and the output negative terminal. The four inductors are anti-coupled and arranged in the first inductor magnetic core, and the first inductor and the second inductor are both connected between one synchronization unit and the output positive terminal or the output negative terminal.

2. The single-stage power conversion device of claim 1, wherein, The first synchronization unit further includes the first SR combination and the secondary side winding, the second synchronization unit further includes the second SR combination and the secondary side winding, each of the secondary side windings includes the first secondary side winding and the second secondary side winding, each of the SR combinations includes the first synchronous rectification switch and the second synchronous rectification switch in common source, in the same synchronization unit, the first end of each of the secondary side windings is electrically connected to the unit positive terminal, the second end of the first secondary side winding is electrically connected to the drain of the first synchronous rectification switch, and the second end of the second secondary side winding is electrically connected to the drain of the second synchronous rectification switch, the source of each of the synchronous rectification switches is electrically connected to the unit negative terminal, the positive terminal of the first synchronization unit is electrically connected to the first end of the first inductor, the second end of the first inductor is electrically connected to the output positive terminal, the negative terminal of the first synchronization unit is electrically connected to the output negative terminal, the positive terminal of the second synchronization unit is electrically connected to the output positive terminal, the negative terminal of the second synchronization unit is electrically connected to the first end of the second inductor, and the second end of the second inductor is electrically connected to the output negative terminal.

3. A single-stage power conversion device according to claim 2, characterized in that, The first primary side sub-circuit includes the first primary side winding, the second primary side sub-circuit includes the second primary side winding, the first primary side winding and the four secondary side windings in the first secondary side sub-circuit are coupled in the same transformer magnetic core, and the second primary side winding and the four secondary side windings in the second secondary side sub-circuit are coupled in the same transformer magnetic core.

4. The single-stage power conversion device of claim 1, wherein, The first inductor magnetic core includes the four inductor winding posts and the inductor middle post, and the four inductors are arranged around the inductor middle post.

5. A single-stage power conversion device according to claim 4, characterized in that, The first end of the inductor wound on each of the two adjacent inductor winding posts is electrically connected to the first synchronization unit and the second synchronization unit respectively, and the second end of the inductor wound on each of the two adjacent inductor winding posts is electrically connected to the output positive terminal and the output negative terminal respectively.

6. The single-stage power conversion device of claim 4, wherein, The direct-current magnetic flux directions of the inductors wound on each of the inductor winding posts are the same.

7. The single-stage power conversion device of claim 2, wherein, The power conversion device further comprises two transformer magnetic cores, the first inductive magnetic core and the second inductive magnetic core are arranged between the two transformer magnetic cores; each of the transformer magnetic cores comprises two transformer legs and a transformer winding leg, the transformer winding leg is arranged between the two transformer legs; the primary winding is wound around the transformer winding leg for N turns; each of the secondary windings is wound around the transformer winding leg for half a turn.

8. A single-stage power conversion device according to claim 7, characterized in that, The transformer magnetic core comprises opposite first and third sides, and opposite second and fourth sides; the third side of the transformer magnetic core is adjacent to the first inductive magnetic core; the first and second ends of the primary winding are both adjacent to the third side; the first ends of the two secondary windings of the first synchronous unit are both adjacent to the third side, and the second ends of the two secondary windings of the first synchronous unit are both adjacent to the first side; the first ends of the two secondary windings of the second synchronous unit are both adjacent to the first side, and the second ends of the two secondary windings of the second synchronous unit are both adjacent to the third side.

9. The single-stage power conversion device of claim 2, wherein, The power conversion device further comprises a third secondary circuit and a fourth secondary circuit, the third secondary circuit and the fourth secondary circuit both comprise a synchronous unit and an inductor, the synchronous unit comprises a first synchronous unit and a second synchronous unit, and the inductor comprises a first inductor and a second inductor; each of the synchronous units comprises a unit positive terminal and a unit negative terminal; the first inductor is connected across the unit positive terminal and the output positive terminal, and the second inductor is connected across the unit negative terminal and the output negative terminal; the four inductors in the third secondary circuit and the fourth secondary circuit are anti-coupled and arranged in the second inductive magnetic core; the first inductor and the second inductor are both connected across one synchronous unit and the output positive terminal or the output negative terminal.

10. The single-stage power conversion device of claim 2, wherein, The power conversion device further comprises two transformer magnetic cores, the first inductive magnetic core and the second inductive magnetic core are arranged between the two transformer magnetic cores; each of the transformer magnetic cores comprises two transformer legs and two transformer winding legs, the transformer winding legs are arranged between the two transformer legs, and the two transformer winding legs and the two transformer legs are arranged in a line; The primary winding is wound around each of the transformer winding legs for N turns; the four secondary windings in each of the secondary circuits are wound around one of the transformer winding legs for half a turn, and each of the transformer winding legs is wound with the four secondary windings in one of the secondary circuits.

11. The single-stage power conversion device of claim 3, wherein, Each of the primary sub-circuits further comprises a first primary switch, a second primary switch, a third primary switch and a fourth primary switch, the first primary switch and the second primary switch are connected in series as a first switch bridge arm, the third primary switch and the fourth primary switch are connected in series as a second switch bridge arm, the drains of the first primary switch and the third primary switch are both electrically connected to the input positive terminal, and the sources of the second primary switch and the fourth primary switch are both electrically connected to the input negative terminal; the first end of the primary winding is electrically connected to the midpoint of the first switch bridge arm, and the second end of the primary winding is electrically connected to the midpoint of the second switch bridge arm.

12. The single-stage power conversion device of claim 11, wherein, The first end of each of the primary windings, the first end of each of the first secondary windings, and the second end of each of the second secondary windings are the same-named ends, and are marked as point ends.

13. A single-stage power conversion device according to claim 12, characterized in that, The power conversion device further comprises a first control signal, a second control signal, a third control signal, a fourth control signal, a fifth control signal, a sixth control signal, a seventh control signal, and an eighth control signal; the duty cycles of the first control signal, the second control signal, the third control signal, and the fourth control signal are equal, and the phases of the first control signal, the second control signal, the third control signal, and the fourth control signal are sequentially staggered by 90 degrees; the fifth control signal and the first control signal are complementary, the sixth control signal and the second control signal are complementary, the seventh control signal and the third control signal are complementary, and the eighth control signal and the fourth control signal are complementary; the first control signal is used to control the turn-on and turn-off of the first primary switch and the fourth primary switch in the first primary sub-circuit, the second control signal is used to control the turn-on and turn-off of the first primary switch and the fourth primary switch in the second primary sub-circuit, the third control signal is used to control the turn-on and turn-off of the second primary switch and the third primary switch in the first primary sub-circuit, and the fourth control signal is used to control the turn-on and turn-off of the second primary switch and the third primary switch in the second primary sub-circuit. The fifth control signal is used to control the turn-on and turn-off of the two second synchronous rectification switches in the first secondary circuit, the sixth control signal is used to control the turn-on and turn-off of the two second synchronous rectification switches in the second secondary circuit, the seventh control signal is used to control the turn-on and turn-off of the two first synchronous rectification switches in the first secondary circuit, and the eighth control signal is used to control the turn-on and turn-off of the two first synchronous rectification switches in the second secondary circuit.

14. The single-stage power conversion device of claim 13, wherein, The power conversion device further comprises a third secondary circuit and a fourth secondary circuit, and each of the third secondary circuit and the fourth secondary circuit comprises a first synchronous unit and a second synchronous unit; each synchronous unit comprises a first synchronous rectification switch and a second synchronous rectification switch in common source; the fifth control signal is used to control the turn-on and turn-off of the two second synchronous rectification switches in the third secondary circuit, the sixth control signal is used to control the turn-on and turn-off of the two second synchronous rectification switches in the fourth secondary circuit, the seventh control signal is used to control the turn-on and turn-off of the two first synchronous rectification switches in the third secondary circuit, and the eighth control signal is used to control the turn-on and turn-off of the two first synchronous rectification switches in the fourth secondary circuit.

15. A single-stage power conversion device, characterized by, The power conversion circuit comprises an input end, an output end and a power conversion sub-circuit, the power conversion sub-circuit comprises a first primary winding, a second primary winding, a first secondary circuit, a second secondary circuit and a four-phase inductor, the first secondary circuit comprises a first synchronous unit and a second synchronous unit, the second secondary circuit comprises a third synchronous unit and a fourth synchronous unit, each of the synchronous units comprises two secondary windings, the first primary winding, the two secondary windings in the first synchronous unit and the two secondary windings in the second synchronous unit are magnetically coupled in a first transformer magnetic core, the second primary winding, the two secondary windings in the third synchronous unit and the two secondary windings in the fourth synchronous unit are magnetically coupled in a second transformer magnetic core, the four-phase inductor comprises four inductor windings, the four inductor windings are coupled in a same inductor magnetic core, the four inductor windings are a first inductor winding, a second inductor winding, a third inductor winding and a fourth inductor winding in turn, the first inductor winding, the second inductor winding, the third inductor winding and the fourth inductor winding are anti-coupled in turn, the fourth inductor winding and the first inductor winding are anti-coupled. The input end comprises an input positive end and an input negative end, the output end comprises an output positive end and an output negative end. Each of the synchronous units has a unit positive end and a unit negative end, the first inductor winding is connected between the output positive end and the unit positive end of the first synchronous unit, the unit negative end of the first synchronous unit and the output negative end are electrically connected, the second inductor winding is connected between the output negative end and the unit negative end of the first synchronous unit, the unit positive end of the second synchronous unit and the output positive end are electrically connected, the third inductor winding is connected between the output positive end and the unit positive end of the third synchronous unit, the unit negative end of the third synchronous unit and the output negative end are electrically connected, and the fourth inductor winding is connected between the output negative end and the unit negative end of the fourth synchronous unit, the unit positive end of the fourth synchronous unit and the output positive end are electrically connected. The inductor magnetic core is arranged between the first transformer magnetic core and the second transformer magnetic core.

16. The single-stage power conversion device of claim 15, wherein, The first synchronous unit comprises a first SR combination, the second synchronous unit comprises a second SR combination, the third synchronous unit comprises a first SR combination, the fourth synchronous unit comprises a second SR combination, each of the SR combinations comprises a first synchronous rectification switch and a second synchronous rectification switch in common source, the two secondary windings are a first secondary winding and a second secondary winding respectively, in each of the synchronous units, each of the sources is electrically connected to the unit negative end of the synchronous unit, the drain of the first synchronous rectification switch is electrically connected to a second end of the first secondary winding, and the drain of the second synchronous rectification switch is electrically connected to a second end of the second secondary winding, the first end of the first secondary winding and the first end of the second secondary winding are electrically connected to the unit positive end.

17. The single-stage power conversion device of claim 16, wherein, The first transformer magnetic core and the second transformer magnetic core both comprise opposite first and third sides, opposite second and fourth sides, two transformer legs and a transformer leg post; the third side of the first transformer magnetic core and the third side of the second transformer magnetic core are both arranged adjacent to the inductor magnetic core; the first SR combination of the first synchronous unit is arranged adjacent to the first side of the first transformer magnetic core; the first SR combination of the third synchronous unit is arranged adjacent to the first side of the second transformer magnetic core; the second SR combination of the second synchronous unit is arranged adjacent to the third side of the first transformer magnetic core; and the second SR combination of the fourth synchronous unit is arranged adjacent to the third side of the second transformer magnetic core.

18. The single-stage power conversion device of claim 17, wherein, The circuit substrate further comprises opposite upper and lower surfaces and a plurality of holes, each of the holes penetrating the upper and lower surfaces; the plurality of holes comprise a transformer leg post hole; the primary and secondary windings are both arranged in the circuit substrate and / or on the surface of the circuit substrate and are wound around the corresponding transformer leg post hole; the first and second transformer magnetic cores both penetrate the corresponding holes and are fastened to the circuit substrate from the upper and lower surfaces respectively; the synchronous rectification switches are arranged on the upper and / or lower surfaces; the inductor magnetic core comprises four inductor leg posts and an inductor middle post, the four inductor leg posts being arranged around the inductor middle post; the plurality of holes comprise four inductor leg post holes for the inductor leg posts to penetrate; and the four inductor windings are wound around the corresponding inductor leg post holes respectively.

19. The single-stage power conversion device of claim 17, wherein, The circuit substrate further comprises a first primary switch combination and a second primary switch combination, the first primary switch combination being electrically connected with the first primary winding, and the second primary switch combination being electrically connected with the second primary winding; the primary switches are arranged on the upper surface of the circuit substrate, the first primary switch combination is arranged adjacent to the first transformer magnetic core, and the second primary switch combination is arranged adjacent to the second transformer magnetic core.

20. The single-stage power conversion device of claim 17, wherein, The circuit substrate further comprises an output terminal combination, which is arranged on the lower surface of the circuit substrate and is adjacent to the second and fourth sides of the inductor magnetic core or is adjacent to the outer side of the first SR combination.

21. The single-stage power conversion device of claim 17, wherein, The circuit substrate further comprises a signal terminal combination, an input terminal and an input capacitor, which are arranged on the lower surface of the circuit substrate, the signal terminal combination being arranged adjacent to the first SR combination; the input terminal being arranged adjacent to the inductor magnetic core, and the input capacitor being arranged adjacent to the input terminal; the input terminal and the input capacitor being arranged adjacent to the first primary switch combination and the second primary switch combination.

22. The single-stage power conversion device of claim 15, wherein, The power conversion sub-circuits are arranged in at least two; the first primary windings corresponding to the power conversion sub-circuits are electrically connected with each other; the second primary windings corresponding to the power conversion sub-circuits are electrically connected with each other; the first primary windings in the power conversion sub-circuits, the two secondary windings in the first synchronous unit and the two secondary windings in the second synchronous unit are magnetically coupled in the first transformer magnetic core; and the second primary windings corresponding to the power conversion sub-circuits, the two secondary windings in the third synchronous unit and the two secondary windings in the fourth synchronous unit are magnetically coupled in the second transformer magnetic core.

23. The single-stage power conversion device of claim 22, wherein, In each of the power conversion sub-circuit, the first synchronization unit comprises a first SR combination, the second synchronization unit comprises a second SR combination, the third synchronization unit comprises another first SR combination, and the fourth synchronization unit comprises another second SR combination; each of the SR combination comprises a first synchronous rectifier switch and a second synchronous rectifier switch in common source configuration; In each of the synchronization unit: the two secondary windings are a first secondary winding and a second secondary winding respectively; a first end of the first secondary winding and a first end of the second secondary winding are shorted and electrically connected to a unit positive terminal; a second end of the first secondary winding and a drain of the first synchronous rectifier switch are electrically connected, and a second end of the second secondary winding and a drain of the second synchronous rectifier switch are electrically connected; a source of the first synchronous rectifier switch and a source of the second synchronous rectifier switch are shorted and electrically connected to a unit negative terminal.

24. The single-stage power conversion device of claim 23, wherein, The at least two inductance magnetic cores are arranged along an x-axis direction; the first transformer magnetic core and the second transformer magnetic core each comprise opposite first and third sides and opposite second and fourth sides; the third side of the first transformer magnetic core and the third side of the second transformer magnetic core are arranged adjacent to the inductance magnetic cores; The first SR combination of the first synchronization unit, the first transformer magnetic core, the second SR combination of the second synchronization unit, the inductance magnetic core, the second SR combination of the fourth synchronization unit, the second transformer magnetic core, and the first SR combination of the third synchronization unit are sequentially arranged along a y-axis direction. The first transformer magnetic core comprises two first transformer side posts and at least two first transformer winding posts; the first transformer side posts are arranged on both sides; each of the power conversion sub-circuits corresponds to one of the first transformer winding posts; the first primary winding, the secondary winding combination of the first synchronization unit, and the secondary winding combination of the second synchronization unit are wound on the corresponding first transformer winding post; The second transformer magnetic core comprises two second transformer side posts and at least two second transformer winding posts; the second transformer side posts are arranged on both sides; each of the power conversion sub-circuits corresponds to one of the second transformer winding posts; the second primary winding, the secondary winding combination of the third synchronization unit, and the secondary winding combination of the third synchronization unit are wound on the corresponding second transformer winding post; The winding directions of the first primary windings of adjacent power conversion sub-circuits are opposite; the winding directions of the second primary windings of adjacent power conversion sub-circuits are opposite.

25. The single-stage power conversion device of claim 24, wherein, The circuit substrate further comprises a plurality of holes, each of the holes penetrating the upper surface and the lower surface, the plurality of holes comprising at least four transformer bobbin holes, the primary winding and the secondary winding being arranged in the circuit substrate and / or on the surface of the circuit substrate, the primary winding and the secondary winding being wound around the corresponding transformer bobbin holes respectively, the first transformer magnetic core and the second transformer magnetic core penetrating the corresponding holes and being clamped to the circuit substrate from the upper surface and the lower surface respectively, the synchronous rectification switch being arranged on the upper surface and / or the lower surface, each of the inductor magnetic cores comprising four inductor bobbins and an inductor center column, the plurality of holes comprising at least eight inductor bobbin holes, the four inductor windings in each of the inductor magnetic cores being wound around the corresponding inductor bobbin holes respectively.

26. The single-stage power conversion device of claim 22, wherein, The circuit substrate further comprises a first primary switch combination and a second primary switch combination, the first primary windings of the at least two power conversion sub-circuits being connected in series with each other and with the first primary switch combination, the second primary windings of the at least two power conversion sub-circuits being connected in series with each other and with the second primary switch combination, the at least two power conversion sub-circuits sharing the same first transformer magnetic core and the same second transformer magnetic core, the first primary switch combination and the second primary switch combination being arranged adjacent to the same side of the first transformer magnetic core and the second transformer magnetic core.

27. The single-stage power conversion device of claim 22, wherein, The first secondary circuits in the adjacent power conversion sub-circuits are arranged in a mirror-symmetrical device layout with respect to each other, and the second secondary circuits in the adjacent power conversion sub-circuits are arranged in a mirror-symmetrical device layout with respect to each other.

28. The single-stage power conversion device of claim 24, wherein, The circuit substrate further comprises an output terminal combination, the output terminal combination being arranged on the lower surface of the circuit substrate, a portion of the output terminal combination being arranged adjacent to the second side and the fourth side of each of the inductor magnetic cores, and another portion of the output terminal combination being arranged adjacent to the first SR combination.

29. The single-stage power conversion device of claim 24, wherein, The circuit substrate further comprises a signal terminal combination, an input terminal, and an input capacitor, the signal terminal combination, the input terminal, and the input capacitor being arranged on the lower surface of the circuit substrate, the signal terminal combination being arranged adjacent to the first SR combination, the input terminal being arranged adjacent to the inductor magnetic core, and the input capacitor being arranged adjacent to the input terminal, the input terminal and the input capacitor being arranged adjacent to the first primary switch combination and the second primary switch combination.

30. The single-stage power conversion device of claim 27, wherein, In the adjacent power conversion sub-circuits, the synchronous rectification switches in the mirror-symmetrical positions are controlled by the same control signal.

31. The single-stage power conversion device of claim 18 or 25, wherein, The circuit substrate further comprises a conversion board, the SR combination being arranged on the upper surface and the lower surface of the circuit substrate in a vertically symmetrical manner, the conversion board being arranged below the circuit substrate, the conversion board being used for rewiring the input terminal and the output terminal.

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