Phase-shifted full-bridge and LLC hybrid converter magnetic integration planar transformer and system

Abstract

The invention discloses a phase-shifted full-bridge and LLC hybrid converter magnetic integration planar transformer and system. The phase-shifted full-bridge and LLC hybrid converter magnetic integration planar transformer comprises a first magnetic core, a second magnetic core, a first magnetic core side column, a first magnetic core middle column, a second magnetic core middle column and a second magnetic core side column, the first magnetic core and the second magnetic core are oppositely arranged, and a primary winding and a secondary winding are sequentially arranged between the first magnetic core and the second magnetic core; a first magnetic core middle column, a second magnetic core middle column, a first magnetic core side column and a second magnetic core side column are arranged on the first magnetic core; the first magnetic core middle column and the second magnetic core middle column are arranged between the first magnetic core side column and the second magnetic core side column; through the innovative design of the magnetic integrated planar transformer and the strategy of bridge arm multiplexing, the power density, the magnetic core utilization rate and the overall efficiency of the converter are remarkably improved, the system structure is greatly simplified, the cost is reduced, a brand new solution is provided for achieving a high-performance and miniaturized power conversion system, and the application prospect is wide. The method has a wide application prospect and an important practical value.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics in electrical engineering, and relates to a magnetically integrated planar transformer and system of a phase-shifted full-bridge and LLC hybrid converter. Background Art

[0002] As a form of power supply, DC power supply is widely used in rail transportation, communication industry, power industry, aerospace and other fields. In recent years, DC power supply has put forward requirements such as adjustable voltage, miniaturization, high efficiency, and multi-channel output. In response to such requirements, a hybrid topology of phase-shifted full-bridge and LLC hybrid converter is adopted. By multiplexing the bridge arm, the LLC resonant cavity is connected to the lagging bridge arm of the phase-shifted full-bridge converter, which will be more conducive to the soft switching of the primary switch tube in the hybrid topology to reduce the switching loss of the power device and thus improve the converter efficiency; at the same time, the phase-shifted full-bridge converter can achieve the requirement of wide-range adjustable voltage by adjusting the phase shift angle. The LLC resonant converter works in the DCX state. By selecting a reasonable voltage gain and making the LLC work at the resonance point, the working efficiency can be further improved.

[0003] However, the phase-shifted full-bridge and LLC hybrid converter contains many magnetic components, including phase-shifted full-bridge resonant inductors, phase-shifted full-bridge transformers, LLC resonant inductors, and LLC transformers. The use of traditional winding inductors and transformers will limit the improvement of overall efficiency and power density. In this regard, a printed circuit board (PCB) can be used instead of the traditional winding winding to take advantage of the high precision and flat design of the PCB, thereby improving processing consistency, heat dissipation, and reducing losses.

[0004] On this basis, considering that the phase-shifted full-bridge resonant inductor will cause the duty cycle loss problem and ZVS can be achieved through the LLC resonant cavity, the phase-shifted full-bridge resonant inductor is removed, and the three magnetic components of the phase-shifted full-bridge transformer, LLC resonant inductor (replaced by leakage inductance), and LLC transformer are integrated into a pair of magnetic cores using magnetic integration technology, which can further reduce the volume and loss of magnetic components. Magnetic integration technology reduces the number of converter magnetic components by merging multiple magnetic cores into a pair of magnetic cores, thereby improving the overall efficiency and power density of the converter. Summary of the invention

[0005] The purpose of the present invention is to provide a magnetically integrated planar transformer for a phase-shifted full-bridge and LLC hybrid converter, which solves the problems of large number of magnetic elements, large volume and high loss in the phase-shifted full-bridge converter and LLC resonant converter in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter comprises a first magnetic core, a second magnetic core, a first magnetic core side column, a first magnetic core middle column, a second magnetic core middle column and a second magnetic core side column; the first magnetic core and the second magnetic core are arranged opposite to each other, and a primary winding and a secondary winding are arranged in sequence between the first magnetic core and the second magnetic core; a first magnetic core middle column, a second magnetic core middle column, a first magnetic core side column and a second magnetic core side column are arranged on the first magnetic core; the first magnetic core middle column and the second magnetic core middle column are arranged between the first magnetic core side column and the second magnetic core side column.

[0007] Furthermore, both the first magnetic core center column and the second magnetic core center column have air gaps, the effective cross-sectional areas of the first magnetic core center column and the first magnetic core side column are the same, and the effective cross-sectional areas of the second magnetic core center column and the second magnetic core side column are the same; the size of the air gap in the first magnetic core center column is different from the size of the air gap in the second magnetic core center column; the effective cross-sectional areas of the first magnetic core side column and the second magnetic core side column are the same.

[0008] Furthermore, the primary winding includes a phase-shifted full-bridge primary winding Lpps and an LLC primary winding Lpllc, and the phase-shifted full-bridge secondary winding includes a phase-shifted full-bridge secondary winding Lsps and LLC secondary windings Lsllc1 and Lsllc2.

[0009] Furthermore, the primary winding Lpps of the phase-shifted full-bridge is wound on the middle column of the first magnetic core and is wound with Np1 turns, the primary winding Lpllc of the LLC is wound on the middle column of the second magnetic core and is wound with Np2 turns, and the winding direction of the primary winding Lpps of the phase-shifted full-bridge is the same as that of the primary winding Lpllc of the LLC; the secondary winding Lsps of the phase-shifted full-bridge is wound on the middle column of the first magnetic core and is wound with Ns1 turns, and the secondary windings Lsllc1 and L sllc2 is wound on the middle column of the second magnetic core and is wound with Ns2 turns. The winding direction of the secondary winding Lsps of the phase-shifted full-bridge is opposite to that of the primary winding Lpps of the phase-shifted full-bridge. The winding direction of the LLC secondary windings Lsllc1 and Lsllc2 is opposite to that of the LLC primary winding Lpllc. Np1+Ns1 turns of winding are wound on the middle column of the first magnetic core, and Np2+2*Ns2 turns of winding are wound on the middle column of the second magnetic core.

[0010] Furthermore, the primary winding Lpps of the phase-shifted full-bridge is composed of Np1 turns of winding, which is connected starting from the first layer PCB winding terminal 1, and each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the Np1th layer PCB winding terminal 2 to end the winding of the primary winding Lpps of the phase-shifted full-bridge.

[0011] Furthermore, the LLC primary winding Lpllc is composed of Np2 windings, which are connected starting from the first layer PCB winding terminal 4, and each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the Np2th layer PCB winding terminal 3 to end the winding of the LLC primary winding Lpllc.

[0012] Furthermore, the secondary winding Lsps of the phase-shifted full-bridge is composed of Ns1 turns of winding, which is connected from the PCB winding terminal 5 of the 0.5×Np1+1th layer, and each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the PCB winding terminal 6 of the Np1+Ns1th layer to end the winding of the secondary winding Lsx.

[0013] Furthermore, the LLC secondary winding Lsllc1 is composed of Ns2 turns of winding, which is connected starting from the PCB winding terminal 8 of the Np2+1th layer, and each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent and connected to the PCB winding terminal 7 of the Np2+Ns2th layer to end the winding of the LLC secondary winding Lsllc1.

[0014] Furthermore, the LLC secondary winding Lsllc2 is composed of Ns2 turns of winding, and is connected starting from the PCB winding terminal 10 of the Np2+Ns2th layer, and each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent and connected to the PCB winding terminal 9 of the Np2+2×Ns2th layer to end the winding of the LLC secondary winding Lsllc2.

[0015] A voltage transformation system comprises the above-mentioned phase-shifted full-bridge and LLC hybrid converter magnetic integrated planar transformer.

[0016] Compared with the prior art, the present invention has the following technical effects: The present invention constructs an efficient and compact hybrid converter topology by innovatively integrating the technical features of the phase-shifted full-bridge converter and the LLC resonant converter. The core of this design is that the transformer of the phase-shifted full-bridge converter and the transformer of the LLC resonant converter are integrated by flux coupling. This move not only greatly simplifies the complex layout of multiple independent magnetic components in the traditional design, but also significantly reduces the overall volume of the converter, providing strong support for the miniaturization and lightweighting of electronic equipment.

[0017] Furthermore, the present invention uses leakage inductance to replace the original primary series resonant inductor in the LLC resonant converter. This design innovation not only reduces the number of required components and reduces the complexity of the system, but also integrates the three originally dispersed magnetic components into a planar magnetic core through the magnetically integrated planar transformer design. This integrated design not only improves the power density of the converter, allowing more power to be transmitted per unit volume, but also significantly improves the utilization rate of the magnetic core, making the magnetic energy conversion more efficient and minimizing energy loss.

[0018] In addition, another highlight of the present invention is its bridge arm reuse strategy. By connecting the LLC resonant cavity to the lagging bridge arm of the phase-shifted full-bridge converter, the soft switching function of the primary switch tube in the hybrid topology is realized. This design greatly reduces the overlapping area of ​​voltage and current of the switch tube during the opening and closing process, almost eliminating the switching loss, thereby effectively improving the overall efficiency of the converter. The implementation of soft switching not only prolongs the service life of the power device, but also reduces the system's demand for heat dissipation devices, further reducing the size and weight of the converter.

[0019] In summary, the present invention not only significantly improves the power density, core utilization and overall efficiency of the converter through the innovative design of the magnetic integrated planar transformer and the strategy of bridge arm reuse, but also greatly simplifies the system structure and reduces costs. It provides a new solution for realizing high-performance and miniaturized power conversion systems, and has broad application prospects and important practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a principle diagram of the phase-shifted full-bridge and LLC hybrid converter of the present invention; Figure 2 It is a schematic diagram of the split magnetic integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter of the present invention; Figure 3 It is a schematic diagram of the magnetically integrated planar transformer winding of the phase-shifted full-bridge and LLC hybrid converter of the present invention; Figure 4 It is a schematic diagram of the forward coupling reluctance model of the magnetically integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter of the present invention; Figure 5 It is a schematic diagram of the reverse coupling reluctance model of the magnetically integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter of the present invention. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The technical principle of the present invention mainly revolves around the hybrid topology of a phase-shifted full-bridge converter and an LLC resonant converter, and achieves the goal of reducing the converter size and improving power density and efficiency through the technical means of magnetic integration and bridge arm reuse.

[0023] The present invention integrates the transformer of the phase-shifted full-bridge converter and the transformer of the LLC resonant converter on a common magnetic core structure, namely the first magnetic core 11 and the second magnetic core 41, by means of magnetic flux coupling. The two magnetic cores are arranged opposite to each other, and the primary winding and the secondary winding are arranged in sequence in the middle.

[0024] This magnetic integration design not only reduces the number of magnetic components, but also improves the utilization of the magnetic core and the overall efficiency of the converter by optimizing the magnetic circuit layout and winding configuration.

[0025] In the LLC resonant converter, the primary series resonant inductor is an important component used to adjust the resonant frequency of the resonant cavity and realize energy transfer.

[0026] The present invention uses leakage inductance (i.e., magnetic flux that is not fully coupled in the magnetic core) to replace the primary series resonant inductance. By precisely adjusting the air gap size and winding configuration of the core center column, the leakage inductance can be precisely controlled to meet the working requirements of the LLC resonant converter.

[0027] This design not only simplifies the system structure, but also reduces the number of components and cost.

[0028] In the hybrid topology, the present invention connects the LLC resonant cavity to the lagging bridge arm of the phase-shifted full-bridge converter by bridge arm multiplexing.

[0029] This design allows the LLC resonant converter and the phase-shifted full-bridge converter to share part of the circuit and switch tubes, thereby reducing the number of switch tubes and the complexity of the system.

[0030] More importantly, through the reuse of bridge arms, soft switching of the primary switch tube in the hybrid topology is achieved. Soft switching means that the overlapping area of ​​voltage and current of the switch tube during the opening and closing process is greatly reduced, almost eliminating switching losses. This not only improves the efficiency of the converter, but also extends the service life of the power device.

[0031] The present invention has carefully optimized the winding configuration and air gap design. The primary winding and the secondary winding are respectively wound on different magnetic core middle poles, and the winding direction and number of turns are clearly specified. This winding configuration helps to reduce the mutual inductance interference between the windings and improve the stability and reliability of the converter.

[0032] At the same time, by precisely adjusting the air gap size and effective cross-sectional area of ​​the core center column, precise control of the winding inductance can be achieved to meet different application requirements.

[0033] In summary, the technical principle of the present invention is mainly based on magnetic integration, leakage inductance instead of primary series resonant inductance, bridge arm reuse, and careful winding configuration and air gap design. These technical means work together to achieve the goal of reducing the size of the converter and improving power density and efficiency.

[0034] Example 1, please participate Figure 2A magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter includes a first magnetic core 11, a second magnetic core 41, a first magnetic core side column 21, a first magnetic core middle column 31, a second magnetic core middle column 32 and a second magnetic core side column 22; the first magnetic core 11 and the second magnetic core 41 are arranged opposite to each other, and a primary winding and a secondary winding are arranged in sequence between the first magnetic core 11 and the second magnetic core 41; the first magnetic core middle column 31, the second magnetic core middle column 32, the first magnetic core side column 21 and the second magnetic core side column 22 are arranged on the first magnetic core 11; the first magnetic core middle column 31 and the second magnetic core middle column 32 are arranged between the first magnetic core side column 21 and the second magnetic core side column 22.

[0035] By magnetically integrating the transformer parts of the phase-shifted full-bridge converter and the LLC resonant converter, that is, realizing the functions of the two converters on a common magnetic core structure, this design effectively reduces the number of magnetic components and the use of magnetic core materials, thereby reducing the weight and volume of the entire converter. At the same time, magnetic integration also helps to reduce magnetic leakage and energy loss, and improve the overall efficiency of the converter.

[0036] The first magnetic core 11 and the second magnetic core 41 are arranged opposite to each other, and the primary winding and the secondary winding are arranged in sequence in the middle. This layout helps to form a compact and efficient magnetic circuit. The reasonable configuration of the first magnetic core center column 31, the second magnetic core center column 32 and the first magnetic core side column 21, the second magnetic core side column 22 further optimizes the distribution of the magnetic field, reduces the interference and leakage of the magnetic field, and improves the utilization rate of the magnetic core.

[0037] The first magnetic core center column 31 and the second magnetic core center column 32 are both provided with air gaps of different sizes. This design helps to adjust the magnetic resistance of the magnetic core and thus control the inductance of the winding. By accurately adjusting the size of the air gap, the performance of the converter can be finely optimized to meet different application requirements.

[0038] The primary winding and the secondary winding are wound on different core columns, and the winding direction and number of turns are clearly specified. This winding configuration helps reduce the mutual inductance interference between the windings and improve the stability and reliability of the converter. At the same time, through reasonable winding design, the output voltage and current of the converter can also be accurately controlled.

[0039] The structural design uses a planar magnetic core and PCB winding terminals, which helps to simplify the manufacturing process of the converter and improve production efficiency. At the same time, the planar structure also facilitates the maintenance and repair of the converter, reducing the cost of use.

[0040] In summary, the structural design of the magnetically integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter has many advantages, including improved efficiency, optimized magnetic circuit layout, flexible air gap design, winding configuration to improve performance, and easy manufacturing and maintenance. These advantages make the converter have broad application prospects and important practical value in power conversion systems.

[0041] Embodiment 2, the magnetic integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter of this embodiment has a structure as follows Figure 2 As shown, the magnetic integrated planar transformer of the phase-shifted full-bridge and LLC hybrid converter includes a first magnetic core 11 and a second magnetic core 41 arranged opposite to each other, and a primary winding and a secondary winding are arranged in sequence between the first magnetic core 11 and the second magnetic core 41; the first magnetic core 11 is provided with a first magnetic core center column 31, a second magnetic core center column 32, and a first magnetic core side column 21, and a second magnetic core side column 22. The first magnetic core center column 31 and the second magnetic core center column 32 are arranged between the first magnetic core side column 21 and the second magnetic core side column 22; the first magnetic core center column 31 has an air gap, and the effective cross-sectional area of ​​the first magnetic core center column 31 is the same as that of the first magnetic core side column 21; the second magnetic core center column 32 has an air gap, and the effective cross-sectional area of ​​the second magnetic core center column 32 is the same as that of the second magnetic core side column 22; the air gap size of the first magnetic core center column 31 is different from that of the second magnetic core center column 32; the effective cross-sectional area of ​​the first magnetic core side column 21 and the second magnetic core side column 22 is the same. The primary winding includes a phase-shifted full-bridge primary winding Lpps and an LLC primary winding Lpllc, and the phase-shifted full-bridge secondary winding includes a phase-shifted full-bridge secondary winding Lsps and LLC secondary windings Lsllc1 and Lsllc2. The phase-shifted full-bridge primary winding Lpps is wound on the first magnetic core center column 31 and is wound with Np1 turns, and the LLC primary winding Lpllc is wound on the second magnetic core center column 32 and is wound with Np2 turns. The winding direction of the phase-shifted full-bridge primary winding Lpps is the same as that of the LLC primary winding Lpllc; the phase-shifted full-bridge secondary winding Lsps is wound on the first magnetic core center column 31 and is wound with Ns1 turns, and the LLC secondary windings Lsllc1 and Lsllc2 are wound with Ns1 turns. lc2 is wound on the second magnetic core center column 32 and is wound with Ns2 turns. The winding direction of the phase-shifted full-bridge secondary winding Lsps is opposite to that of the phase-shifted full-bridge primary winding Lpps. The winding direction of the LLC secondary windings Lsllc1 and Lsllc2 is opposite to that of the LLC primary winding Lpllc. Np1+Ns1 turns of winding are wound on the first magnetic core center column 31, and Np2+2*Ns2 turns of winding are wound on the second magnetic core center column 32.

[0042] In the above structure, the first core center column 31, the first core side column 21, the first core 11, and the second core 41 constitute a phase-shifted full-bridge excitation inductance circuit; meanwhile, the second core center column 32, the second core side column 22, the first core 11, and the second core 41 constitute an LLC excitation inductance circuit.

[0043] Embodiment 3, compared with embodiment 2, in this embodiment, a connection method between windings is added. For the converter described in embodiment 1, the primary winding Lpps of the phase-shifted full-bridge is wound on the first magnetic core center column 31 and is wound with Np1 turns, the primary winding Lpllc of the LLC is wound on the second magnetic core center column 32 and is wound with Np2 turns, and the winding direction of the primary winding Lpps of the phase-shifted full-bridge is the same as that of the primary winding Lpllc of the LLC; the secondary winding Lsps of the phase-shifted full-bridge is wound on the first magnetic core center column 31 and is wound with Np1 turns. s1 turns, LLC secondary windings Lsllc1 and Lsllc2 are wound on the second magnetic core column 32 and both are wound with Ns2 turns, the winding direction of the phase-shifted full-bridge secondary winding Lsps is opposite to that of the phase-shifted full-bridge primary winding Lpps, the winding direction of the LLC secondary windings Lsllc1 and Lsllc2 is opposite to that of the LLC primary winding Lpllc, Np1+Ns1 turns of winding are wound on the first magnetic core column 31, and Np2+2*Ns2 turns of winding are wound on the second magnetic core column 32. The phase-shifted full-bridge primary winding Lpps consists of Np1 turns of winding. If one turn of winding is wound on each layer, it is connected from the first layer PCB winding terminal 1, and each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent, and connected to the Np1th layer PCB winding terminal 2 to end the winding of the phase-shifted full-bridge primary winding Lpps. The LLC primary winding Lpllc is composed of Np2 windings, which are connected from the first layer PCB winding terminal 4, and each layer of PCB is connected in series to ensure the same winding direction, and connected to the Np2 layer PCB winding terminal 3 to end the winding of the LLC primary winding Lpllc. The phase-shifted full-bridge secondary winding Lsps is composed of Ns1 turns of windings, which are connected from the (0.5×Np1+1)th layer PCB winding terminal 5, and each layer of PCB is connected in series to ensure the same winding direction, and connected to the Np1+Ns1 layer PCB winding terminal 6 to end the winding of the secondary winding Lsx. The LLC secondary winding Lsllc1 is composed of Ns2 turns of windings, which are connected from the (Np2+1)th layer PCB winding terminal 8, and each layer of PCB is connected in series to ensure the same winding direction, and connected to the (Np2+Ns2)th layer PCB winding terminal 7 to end the winding of the LLC secondary winding Lsllc1. The LLC secondary winding Lsllc2 is composed of Ns2 turns of winding, which is connected starting from the PCB winding terminal 10 of the (Np2+Ns2)th layer. Each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent and connected to the PCB winding terminal 9 of the (Np2+2×Ns2)th layer to end the winding of the LLC secondary winding Lsllc2.

[0044] Through the above connection method, the entire phase-shifted full-bridge and LLC hybrid converter magnetic integrated planar transformer is completed, which is connected to the phase-shifted full-bridge and LLC hybrid converter and replaces the original phase-shifted full-bridge transformer, LLC transformer, and LLC resonant inductor. The specific wiring method is: connect the terminal 1 of the primary winding Lpps of the phase-shifted full-bridge to Figure 1 Connect the terminal 2 of the primary winding Lpps of the phase-shifted full-bridge to point A in Figure 1 Connect the terminal 5 of the secondary winding Lsps of the phase-shifted full-bridge to point B in the Figure 1 Connect the terminal 6 of the secondary winding Lsps of the phase-shifted full-bridge to point E in Figure 1 Connect the terminal 3 of LLC primary winding Lpllc to point F in the Figure 1 Connect the terminal 4 of LLC primary winding Lpllc to point C in the Figure 1 At point D in the circuit, terminal 7 of the LLC secondary winding Lsllc1 is connected to Figure 1 Point G in the circuit, the terminal 8 of the LLC secondary winding Lsllc1 is connected to Figure 1 Point H in the middle, the terminal 9 of LLC secondary winding Lsllc2 is connected Figure 1 At point I in the circuit, terminal 10 of the LLC secondary winding Lsllc1 is connected to Figure 1 The J point in the diagram.

[0045] Embodiment 4, compared with embodiment 2, this embodiment adds the coupling mode of the phase-shifted full-bridge and LLC hybrid converter magnetic integrated planar transformer, and the forward coupling magnetic resistance model is as follows: Figure 4 As shown, the phase-shifted full-bridge primary winding Lpps wound on the first magnetic core column 31 and the LLC primary winding Lpllc wound on the second magnetic core column 32 are wound in opposite directions. Under forward coupling, the magnetic flux from the first magnetic core column 31 to the second magnetic core column 32 is shown in Formula 1: (1) The forward coupled magnetoresistance model is as follows Figure 5 As shown, the phase-shifted full-bridge primary winding Lpps wound on the first magnetic core middle column 31 and the LLC primary winding Lpllc wound on the second magnetic core middle column 32 have the same winding direction, and are reversely coupled. The magnetic flux from the first magnetic core column 31 to the second magnetic core column 32 is expressed as Formula 1: (2) Equation 1 and Equation 2 show that under reverse coupling, the magnetic flux flowing between the two transformers when they are working is smaller than that under forward coupling.

[0046] The present invention uses a phase-shifted full-bridge converter and an LLC resonant converter to share a bridge arm. In view of the presence of multiple magnetic components in the hybrid topology, the present invention uses magnetic integration technology to integrate three magnetic components, namely, a phase-shifted full-bridge transformer, an LLC resonant inductor (replaced by leakage inductance), and an LLC transformer, into a pair of magnetic cores, thereby further reducing the volume and loss of the magnetic components. At the same time, by adjusting the size of the core center column, the LLC transformer leakage inductance can be controlled to achieve different voltage gains.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A magnetically integrated planar transformer for a phase-shifted full-bridge and LLC hybrid converter, characterized in that: The invention comprises a first magnetic core (11), a second magnetic core (41), a first magnetic core side column (21), a first magnetic core middle column (31), a second magnetic core middle column (32) and a second magnetic core side column (22); the first magnetic core (11) and the second magnetic core (41) are arranged relative to each other, and a primary winding and a secondary winding are arranged in sequence between the first magnetic core (11) and the second magnetic core (41); the first magnetic core middle column (31), the second magnetic core middle column (32), the first magnetic core side column (21) and the second magnetic core side column (22) are arranged on the first magnetic core (11); the first magnetic core middle column (31) and the second magnetic core middle column (32) are arranged between the first magnetic core side column (21) and the second magnetic core side column (22).

2. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 1, characterized in that: The first magnetic core center column (31) and the second magnetic core center column (32) both have air gaps; the first magnetic core center column (31) and the first magnetic core side column (21) have the same effective cross-sectional area; the second magnetic core center column (32) and the second magnetic core side column (22) have the same effective cross-sectional area; the size of the air gap of the first magnetic core center column (31) is different from the size of the air gap of the second magnetic core center column (32); and the effective cross-sectional areas of the first magnetic core side column (21) and the second magnetic core side column (22) are the same.

3. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 1, characterized in that: The primary winding includes a phase-shifted full-bridge primary winding Lpps and an LLC primary winding Lpllc, and the phase-shifted full-bridge secondary winding includes a phase-shifted full-bridge secondary winding Lsps and LLC secondary windings Lsllc1 and Lsllc2.

4. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 3, characterized in that: The phase-shifted full-bridge primary winding Lpps is wound on the first magnetic core center column (31) and is wound with Np1 turns, the LLC primary winding Lpllc is wound on the second magnetic core center column (32) and is wound with Np2 turns, and the winding direction of the phase-shifted full-bridge primary winding Lpps is the same as the winding direction of the LLC primary winding Lpllc; the phase-shifted full-bridge secondary winding Lsps is wound on the first magnetic core center column (31) and is wound with Ns1 turns, and the LLC secondary windings Lsllc1 and Lsl lc2 is wound on the second magnetic core middle column (32) and is wound with Ns2 turns. The winding direction of the phase-shifted full-bridge secondary winding Lsps is opposite to that of the phase-shifted full-bridge primary winding Lpps. The winding direction of the LLC secondary windings Lsllc1 and Lsllc2 is opposite to that of the LLC primary winding Lpllc. The first magnetic core middle column (31) is wound with Np1+Ns1 turns of winding, and the second magnetic core middle column (32) is wound with Np2+2*Ns2 turns of winding.

5. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 4, characterized in that: The primary winding Lpps of the phase-shifted full-bridge is composed of Np1 turns of winding, which is connected starting from the first layer PCB winding terminal 1, and each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the Np1th layer PCB winding terminal 2 to end the winding of the primary winding Lpps of the phase-shifted full-bridge.

6. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 4, characterized in that: The LLC primary winding Lpllc is composed of Np2 windings, which are connected starting from the first layer PCB winding terminal 4. Each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the Np2th layer PCB winding terminal 3 to end the winding of the LLC primary winding Lpllc.

7. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 4, characterized in that: The secondary winding Lsps of the phase-shifted full-bridge is composed of Ns1 turns of winding, which is connected starting from the PCB winding terminal 5 of the 0.5×Np1+1th layer. Each layer of PCB is connected in series in sequence with the same winding direction, and is connected to the PCB winding terminal 6 of the Np1+Ns1th layer to end the winding of the secondary winding Lsx.

8. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 4, characterized in that: The LLC secondary winding Lsllc1 is composed of Ns2 turns of winding, which is connected starting from the PCB winding terminal 8 of the Np2+1th layer. Each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent and connected to the PCB winding terminal 7 of the Np2+Ns2th layer to end the winding of the LLC secondary winding Lsllc1.

9. The magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter according to claim 4, characterized in that: The LLC secondary winding Lsllc2 is composed of Ns2 turns of winding, which is connected starting from the PCB winding terminal 10 of the Np2+Ns2 layer. Each layer of PCB is connected in series in sequence to ensure that the winding direction is consistent and connected to the PCB winding terminal 9 of the Np2+2×Ns2 layer to end the winding of the LLC secondary winding Lsllc2.

10. A voltage transformation system, characterized in that: It comprises a magnetically integrated planar transformer of a phase-shifted full-bridge and LLC hybrid converter as described in any one of claims 1 to 9.

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