Double-half-bridge direct-current converter integrated structure and control method thereof

Abstract

The invention discloses a double-half-bridge direct-current converter integrated structure. Comprising an input direct-current power supply Vin, a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first resonance unit circuit, a second resonance unit circuit, a transformer T, a first synchronous rectifier tube SR1, a second synchronous rectifier tube SR2, a third synchronous rectifier tube SR3, a fourth synchronous rectifier tube SR4, a first output filter capacitor Co1 and a second output filter capacitor Co2, the transformer T comprises a first primary winding PT1, a second primary winding PT2, a first secondary winding ST1, a second secondary winding ST2, a third secondary winding ST3 and a fourth secondary winding ST4. Full-period work of the transformer winding is achieved, the winding utilization rate is high, the shortest alternating current path, high efficiency and high power density of the winding are achieved, winding loss and the occupied area are effectively reduced, control is easy, reliability is high, and implementation is easy.

Description

Technical Field

[0001] The invention relates to a converter and a control method thereof, and in particular to a dual half-bridge DC converter integrated structure and a control method thereof. Background Art

[0002] With the development of technologies such as artificial intelligence, 5G, the Internet of Things, and blockchain, the global demand for computing power will continue to grow. The power consumption of large-capacity data centers will also become higher and higher. The traditional 12V power supply architecture can no longer adapt to the development of the new generation of data center technology due to problems such as multi-level conversion and severe high-current line loss. The use of a 48V power supply system architecture can not only reduce the number of system power conversion levels, but also greatly reduce line losses, making it more suitable for the needs of large-capacity data centers. Existing studies have shown that the use of a 48V power supply system architecture instead of a traditional 12V architecture can greatly improve the efficiency of the power supply system.

[0003] Due to the maturity of low-voltage and high-current point of load (POL) technology, the two-stage solution of intermediate bus converter cascade POL has been widely used. In the two-stage architecture, the two-stage bus architecture, in which the front-stage bus converter is mostly a DCX module, and the back stage is a POL converter with different output voltages. In order to improve the efficiency of POL and thus improve the overall efficiency, for the 48V bus architecture, the front-end bus converter needs to achieve a higher transformation ratio. The higher the converter ratio, the larger the volume required for the converter will be, and the higher the loss. At the same time, the area of ​​the server motherboard is certain. For the 48V bus power supply architecture, it is necessary to increase the location of the bus converter on the already dense server motherboard, and the converter volume needs to be as small as possible. Therefore, the current research focus of the two-stage architecture is on bus converters with large transformation ratio, high efficiency, and high power density.

[0004] At present, bus converters have been studied to a certain extent. For the transformer part of the bus converter, compared with the full-bridge rectifier circuit, the full-wave rectifier circuit has fewer rectifier tubes and smaller termination losses, and has been widely used. However, the secondary winding of the full-wave rectifier circuit only works halfway in each mode, and the winding utilization rate is low. In addition, as the power increases, the winding occupies an increasingly larger area, and the winding loss increases, which limits the efficiency and power density of the converter. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a dual half-bridge DC converter integrated structure and a control method thereof with higher winding utilization, smaller footprint and loss.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A dual half-bridge DC converter integrated structure, comprising an input DC power supply Vin, a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first resonant unit circuit, a second resonant unit circuit, a transformer T, a first synchronous rectifier tube SR1, a second synchronous rectifier tube SR2, a third synchronous rectifier tube SR3, a fourth synchronous rectifier tube SR4, a first output filter capacitor Co1 and a second output filter capacitor Co2, wherein the transformer T comprises a first primary winding PT1, a second primary winding PT2, a first secondary winding ST1, a second secondary winding ST2, a third secondary winding ST3, and a fourth secondary winding ST4;

[0008] The positive electrode of the input DC power supply Vin is connected to the first end of the first primary winding PT1 through the first switch tube S1 and the first resonant unit circuit in sequence, and is also connected to the first end of the first secondary winding ST1 through the first switch tube S1 and the second switch tube S2 in sequence, and is also connected to the first end of the second primary winding PT2 through the third switch tube S3 and the second resonant unit circuit in sequence, and is also connected to the first end of the third secondary winding ST3 through the third switch tube S4 and the fourth switch tube S4 in sequence; the negative electrode of the input DC power supply Vin is connected to the first end of the first secondary winding ST1 through the first synchronous rectifier tube SR1, and is also connected to the first end of the second secondary winding ST2 through the third switch tube S3 and the second resonant unit circuit in sequence. The second end of the third secondary winding ST3 and the second end of the fourth secondary winding ST4 are respectively connected through the first output filter capacitor Co1, and the first end of the second secondary winding ST2 and the second end of the first primary winding PT1 are respectively connected through the second synchronous rectifier tube SR2, and the first end of the third secondary winding ST3 is connected through the third synchronous rectifier tube SR3, and the second end of the first secondary winding ST1 and the second end of the second secondary winding ST2 are respectively connected through the second output filter capacitor Co2, and the first end of the fourth secondary winding ST4 and the second end of the second primary winding PT2 are respectively connected through the fourth synchronous rectifier tube SR4.

[0009] Furthermore, the first primary winding PT1 and the second primary winding PT2 are wound around the magnetic core in opposite directions, the first secondary winding ST1 and the second secondary winding ST2 are wound around the magnetic core in opposite directions, and the third secondary winding ST3 and the fourth secondary winding ST4 are wound around the magnetic core in opposite directions.

[0010] Furthermore, the first primary winding PT1 and the second primary winding PT2 surround the magnetic core with N turns, and the first secondary winding ST1, the second secondary winding ST2, the third secondary winding ST3, and the fourth secondary winding ST4 all surround the magnetic core with 1 / 2 turn, and N is a positive integer.

[0011] Furthermore, the drain of the first switch tube S1 is connected to the positive electrode of the input DC power supply Vin, the source is respectively connected to the drain of the second switch tube S2 and the first end of the first resonant unit circuit, and the source of the second switch tube S2 is connected to the first end of the first secondary winding ST1.

[0012] Furthermore, the drain of the third switch tube S3 is connected to the positive electrode of the input DC power supply Vin, and the source is respectively connected to the drain of the fourth switch tube S4 and the first end of the second resonant unit circuit, and the source of the fourth switch tube S4 is connected to the first end of the third secondary winding ST3.

[0013] Furthermore, the source of the first synchronous rectifier SR1 is connected to the negative electrode of the input DC power supply Vin, and the drain is connected to the first end of the first secondary winding ST1; the source of the second synchronous rectifier SR2 is connected to the negative electrode of the input DC power supply Vin, and the drain is respectively connected to the first end of the first secondary winding ST2 and the second end of the first primary winding PT1.

[0014] Furthermore, the source of the third synchronous rectifier SR3 is connected to the negative electrode of the input DC power supply Vin, and the drain is connected to the first end of the third secondary winding ST3; the source of the fourth synchronous rectifier SR4 is connected to the negative electrode of the input DC power supply Vin, and the drain is respectively connected to the first end of the fourth secondary winding ST4 and the second end of the second primary winding PT2.

[0015] Furthermore, the first resonant unit circuit includes a first resonant inductor Lr1 and a first resonant capacitor Cr1, the first end of the first resonant inductor Lr1 serves as the first end of the first resonant unit circuit, the second end of the first resonant inductor Lr1 is connected to the first end of the first resonant capacitor Cr1, and the second end of the first resonant capacitor Cr1 serves as the second end of the first resonant unit circuit.

[0016] Furthermore, the second resonant unit circuit includes a second resonant inductor Lr2 and a second resonant capacitor Cr2, the first end of the second resonant inductor Lr2 serves as the first end of the second resonant unit circuit, the second end of the second resonant inductor Lr2 is connected to the first end of the second resonant capacitor Cr2, and the second end of the second resonant capacitor Cr2 serves as the second end of the second resonant unit circuit.

[0017] A control method based on the above-mentioned dual half-bridge DC converter integrated structure, the method inputs a first control signal to the gates of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 to control the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 to be synchronously turned on or off; inputs a second control signal to the gates of the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 to control the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 to be synchronously turned on or off, wherein the first control signal and the second control signal also make the first switch tube S1 and the second switch tube S2 complementarily turned on.

[0018] Compared with the prior art, the present invention has the following beneficial effects: all windings of the transformer of the converter of the present invention work within a full cycle, and the winding utilization rate is high; the secondary winding of the transformer realizes the shortest AC path, further reducing the volume and loss; the converter can operate at high-frequency switching, effectively reducing the footprint and weight of the transformer, and achieving high power density; the magnetic flux of all magnetic cores of the converter is fixed and can be the same, which is easy to carry out magnetic integration and can support the realization of high power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A circuit diagram of an embodiment of the dual half-bridge DC converter integrated structure provided by the present invention;

[0020] Figure 2 The control signal waveform of the dual half-bridge DC converter integrated structure provided by the present invention;

[0021] Figure 3 A schematic diagram of the dual half-bridge DC converter integrated structure provided by the present invention when operating in mode 1;

[0022] Figure 4 A schematic diagram of the dual half-bridge DC converter integrated structure provided by the present invention when operating in mode 2;

[0023] Figure 5 A schematic diagram of the dual half-bridge DC converter integrated structure provided by the present invention when operating in mode 3;

[0024] Figure 6 This is a schematic diagram of the dual half-bridge DC converter integrated structure provided by the present invention working in mode 4. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] The embodiment of the present invention provides a dual half-bridge DC converter integrated structure, such as Figure 1 As shown, it is composed of an input DC power supply Vin, a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first resonant inductor Lr1, a first resonant capacitor Cr1, a second resonant inductor Lr2, a second resonant capacitor Cr2, a transformer T, a first synchronous rectifier tube SR1, a second synchronous rectifier tube SR2, a third synchronous rectifier tube SR3, a fourth synchronous rectifier tube SR4, a first output filter capacitor Co1, and a second output filter capacitor Co2.

[0027] Among them, the transformer T is composed of a first primary winding PT1, a second primary winding PT2, a first secondary winding ST1, a second secondary winding ST2, a third secondary winding ST3, and a fourth secondary winding ST4. The first primary winding PT1 is clockwise around the magnetic core for N turns, and the second primary winding PT2 is counterclockwise around the magnetic core for N turns, where N is a positive integer. The first secondary winding ST1 is counterclockwise around the magnetic core for 1 / 2 turn, the second secondary winding ST2 is clockwise around the magnetic core for 1 / 2 turn, the third secondary winding ST3 is clockwise around the magnetic core for 1 / 2 turn, and the fourth secondary winding ST4 is counterclockwise around the magnetic core for 1 / 2 turn. In other embodiments, the winding direction of each winding can also be other directions or other turns, as long as the first primary winding PT1 and the second primary winding PT2 are in opposite directions, the first secondary winding ST1 and the second secondary winding ST2 are in opposite directions, and the third secondary winding ST3 and the fourth secondary winding ST4 are in opposite directions around the magnetic core.

[0028] The drain of the first switch tube S1 is connected to the positive electrode of the input DC power supply Vin, the source of the first switch tube S1 is connected to the drain of the second switch tube S2 and one end of the first resonant capacitor Cr1, the source of the second switch tube S2 is connected to the drain of the first synchronous rectifier tube SR1, the other end of the first resonant capacitor Cr1 is connected to one end of the first resonant inductor Lr1, the other end of the first resonant inductor Lr1 is connected to one end of the first primary winding PT1, and the other end of PT1 is connected to the drain of the second synchronous rectifier tube SR2; the drain of the third switch tube S3 is connected to the positive electrode of the input DC power supply Vin, and the source of the third switch tube S3 is connected to The drain of the fourth switch tube S4 is connected to one end of the second resonant capacitor Cr2, the source of the fourth switch tube S4 is connected to the drain of the third synchronous rectifier tube SR3, the other end of the second resonant capacitor Cr2 is connected to one end of the second resonant inductor Lr2, the other end of the second resonant inductor Lr2 is connected to one end of the second primary winding PT2, and the other end of PT2 is connected to the drain of the fourth synchronous rectifier tube SR4; one end of the second secondary winding ST2 is connected to the drain of the second synchronous rectifier tube SR2, and the other end thereof is connected to one end of the second output filter capacitor Co2, and the other end of the second output filter capacitor Co2 is connected to the third synchronous rectifier tube SR3 The source of the third synchronous rectifier SR3, the drain of the third synchronous rectifier SR3 is connected to one end of the third secondary winding ST3, the other end of ST3 is connected to one end of the first output filter capacitor Co1, and the other end of the first output filter capacitor Co1 is connected to the source of the second synchronous rectifier SR2, that is, the second synchronous rectifier SR2, the second secondary winding ST2, the second output filter capacitor Co2, the third synchronous rectifier SR3, the third secondary winding ST3, and the first output filter capacitor Co1 are sequentially clockwise around the magnetic core to form one turn; one end of the fourth secondary winding ST4 is connected to the drain of the fourth synchronous rectifier SR4, and the other end of ST4 is connected to the first One end of the output filter capacitor Co1 and the other end of the first output filter capacitor Co1 are connected to the source of the first synchronous rectifier SR1, the drain of the first synchronous rectifier SR1 is connected to one end of the first secondary winding ST1, the other end of ST1 is connected to one end of the second output filter capacitor Co2, and the other end of the second output filter capacitor Co2 is connected to the source of the fourth synchronous rectifier SR4, that is, the fourth synchronous rectifier SR4, the fourth secondary winding ST4, the first output filter capacitor Co1, the first synchronous rectifier SR1, the first secondary winding ST1, and the second output filter capacitor Co2 are sequentially counterclockwise around the magnetic core to form one turn. The other end of the first output filter capacitor Co1 and the other end of the second output filter capacitor Co2 are also respectively connected to the negative electrode of the DC power supply Vin.

[0029] The first resonant inductor Lr1 and the first resonant capacitor Cr1 constitute a first resonant unit circuit, and the second resonant inductor Lr2 and the second resonant capacitor Cr2 constitute a second resonant unit circuit. The first resonant inductor Lr1 and the second resonant inductor Lr2 may be separate inductors or may be replaced by leakage inductance of a transformer.

[0030] In specific implementation, all switch tubes should use semiconductor switch devices with parasitic body diodes, such as metal oxide semiconductor field effect transistors, etc. If the selected switch tube does not have a parasitic body diode, a diode should be connected in anti-parallel at both ends of its drain and source.

[0031] When controlling the integrated structure of the dual half-bridge DC converter of the present invention, a first control signal needs to be input into the gates of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 to control the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 to be synchronously turned on or off; a second control signal needs to be input into the gates of the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 to control the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 to be synchronously turned on or off, wherein the first control signal and the second control signal also make the first switch tube S1 and the second switch tube S2 complementarily turned on. In addition, the switch signals of the first switch tube S1 and the second switch tube S2 must be set with a reasonable dead time to achieve soft switching of the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the first synchronous rectifier tube SR1, the second synchronous rectifier tube SR2, the third synchronous rectifier tube SR3, and the fourth synchronous rectifier tube SR4. The waveforms of the first control signal and the second control signal are as follows: Figure 2 shown.

[0032] The dual half-bridge DC converter integrated structure of the present invention has a total of 4 operating modes in one switching cycle.

[0033] like Figure 3 As shown, the switching mode 1[t 0 , t 1 ]:t 0 At the moment, the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 are turned on. At this time, the first resonant capacitor Cr1 resonates with the first resonant inductor Lr1, and the second resonant capacitor Cr2 resonates with the second resonant inductor Lr2 until t 1 At this moment, half a resonance cycle is completed. In this mode, the fourth synchronous rectifier SR4, the fourth secondary winding ST4, the first output filter capacitor Co1, the first synchronous rectifier SR1, the first secondary winding ST1, and the second output filter capacitor Co2 successively surround the magnetic core counterclockwise to form a 1-turn closed AC loop.

[0034] like Figure 4 As shown, the switching mode 2[t 1 , t 2 ]:t1 At the moment, the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 are turned off, and the resonant current charges the drain-source capacitors of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4, and the drain-source capacitors of the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 are discharged to t 2 time.

[0035] like Figure 5 As shown, the switching mode 3[t 2 , t 3 ]:t 2 At the moment, the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 are turned on. At this time, the first resonant capacitor Cr1 resonates with the first resonant inductor Lr1, and the second resonant capacitor Cr2 resonates with the second resonant inductor Lr2 until t 1 At this moment, half a resonance cycle is completed. In this mode, the second synchronous rectifier SR2, the second secondary winding ST2, the second output filter capacitor Co2, the third synchronous rectifier SR3, the third secondary winding ST3, and the first output filter capacitor Co1 sequentially surround the magnetic core clockwise to form a 1-turn closed AC circuit.

[0036] like Figure 6 As shown, the switching mode 4[t 3 , t 4 ]:t 3 At the moment, the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3 are turned off, and the resonant current charges the drain-source capacitors of the second switch tube S2, the third switch tube S3, the second synchronous rectifier tube SR2, and the third synchronous rectifier tube SR3, and the drain-source capacitors of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier tube SR1, and the fourth synchronous rectifier tube SR4 are discharged to t 4 time.

[0037] The voltage gain of the integrated structure of the dual half-bridge DC converter described in the present invention satisfies:

[0038]

[0039] N is the number of turns of the first primary winding PT1 and the second primary winding PT2.

[0040] In the embodiment of the present invention, by adopting a dual half-bridge DC converter integrated structure, compared with the traditional converter structure, the winding loss can be reduced by 30%, the converter footprint can be reduced by 25%, and the efficiency and power density of the converter can be effectively improved.

[0041] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0042] It should be understood that the above embodiments and descriptions only describe the principles, main features and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements all fall within the scope of protection of the present invention.

Claims

1. A dual half-bridge DC converter integrated structure, characterized in that: The invention comprises an input DC power supply (Vin), a first switch tube (S1), a second switch tube (S2), a third switch tube (S3), a fourth switch tube (S4), a first resonant unit circuit, a second resonant unit circuit, a transformer (T), a first synchronous rectifier tube (SR1), a second synchronous rectifier tube (SR2), a third synchronous rectifier tube (SR3), a fourth synchronous rectifier tube (SR4), a first output filter capacitor (Co1) and a second output filter capacitor (Co2), wherein the transformer (T) comprises a first primary winding (PT1), a second primary winding (PT2), a first secondary winding (ST1), a second secondary winding (ST2), a third secondary winding (ST3), and a fourth secondary winding (ST4); The positive electrode of the input DC power supply (Vin) is connected to the first end of the first primary winding (PT1) through the first switch tube (S1) and the first resonant unit circuit in sequence, and is also connected to the first end of the first secondary winding (ST1) through the first switch tube (S1) and the second switch tube (S2) in sequence, and is also connected to the first end of the second primary winding (PT2) through the third switch tube (S3) and the second resonant unit circuit in sequence, and is also connected to the first end of the third secondary winding (ST3) through the third switch tube (S4) and the fourth switch tube (S4) in sequence; the negative electrode of the input DC power supply (Vin) is connected to the first end of the first secondary winding (ST1) through the first synchronous rectifier tube (SR1), and is also connected to the first end of the second secondary winding (ST3) through the third switch tube (S4) and the fourth switch tube (S4). The second end of the third secondary winding (ST3) and the second end of the fourth secondary winding (ST4) are respectively connected through the first output filter capacitor (Co1), the first end of the second secondary winding (ST2) and the second end of the first primary winding (PT1) are respectively connected through the second synchronous rectifier (SR2), the first end of the third secondary winding (ST3) is also connected through the third synchronous rectifier (SR3), the second end of the first secondary winding (ST1) and the second end of the second secondary winding (ST2) are respectively connected through the second output filter capacitor (Co2), and the first end of the fourth secondary winding (ST4) and the second end of the second primary winding (PT2) are respectively connected through the fourth synchronous rectifier (SR4).

2. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The first primary winding (PT1) and the second primary winding (PT2) are wound around the magnetic core in opposite directions, the first secondary winding (ST1) and the second secondary winding (ST2) are wound around the magnetic core in opposite directions, and the third secondary winding (ST3) and the fourth secondary winding (ST4) are wound around the magnetic core in opposite directions.

3. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The first primary winding (PT1) and the second primary winding (PT2) are wrapped around the magnetic core N turns, and the first secondary winding (ST1), the second secondary winding (ST2), the third secondary winding (ST3), and the fourth secondary winding (ST4) are all wrapped around the magnetic core 1 / 2 turn, and N is a positive integer.

4. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The drain of the first switch tube (S1) is connected to the positive electrode of the input DC power supply (Vin), the source is respectively connected to the drain of the second switch tube (S2) and the first end of the first resonant unit circuit, and the source of the second switch tube (S2) is connected to the first end of the first secondary winding (ST1).

5. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The drain of the third switch tube (S3) is connected to the positive electrode of the input DC power supply (Vin), the source is respectively connected to the drain of the fourth switch tube (S4) and the first end of the second resonant unit circuit, and the source of the fourth switch tube (S4) is connected to the first end of the third secondary winding (ST3).

6. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The source of the first synchronous rectifier (SR1) is connected to the negative electrode of the input DC power supply (Vin), and the drain is connected to the first end of the first secondary winding (ST1); the source of the second synchronous rectifier (SR2) is connected to the negative electrode of the input DC power supply (Vin), and the drain is respectively connected to the first end of the first secondary winding (ST2) and the second end of the first primary winding (PT1).

7. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The source of the third synchronous rectifier (SR3) is connected to the negative electrode of the input DC power supply (Vin), and the drain is connected to the first end of the third secondary winding (ST3); the source of the fourth synchronous rectifier (SR4) is connected to the negative electrode of the input DC power supply (Vin), and the drain is respectively connected to the first end of the fourth secondary winding (ST4) and the second end of the second primary winding (PT2).

8. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The first resonant unit circuit comprises a first resonant inductor (Lr1) and a first resonant capacitor (Cr1), wherein the first end of the first resonant inductor (Lr1) serves as the first end of the first resonant unit circuit, the second end of the first resonant inductor (Lr1) is connected to the first end of the first resonant capacitor (Cr1), and the second end of the first resonant capacitor (Cr1) serves as the second end of the first resonant unit circuit.

9. The dual half-bridge DC converter integrated structure according to claim 1, characterized in that: The second resonant unit circuit includes a second resonant inductor (Lr2) and a second resonant capacitor (Cr2), the first end of the second resonant inductor (Lr2) serves as the first end of the second resonant unit circuit, the second end of the second resonant inductor (Lr2) is connected to the first end of the second resonant capacitor (Cr2), and the second end of the second resonant capacitor (Cr2) serves as the second end of the second resonant unit circuit.

10. A control method based on the dual half-bridge DC converter integrated structure according to claim 1, characterized in that: Inputting a first control signal into the gates of the first switch tube (S1), the fourth switch tube (S4), the first synchronous rectifier tube (SR1), and the fourth synchronous rectifier tube (SR4) to control the first switch tube (S1), the fourth switch tube (S4), the first synchronous rectifier tube (SR1), and the fourth synchronous rectifier tube (SR4) to be synchronously turned on or off; A second control signal is inputted into the gates of the second switch tube (S2), the third switch tube (S3), the second synchronous rectifier tube (SR2), and the third synchronous rectifier tube (SR3) to control the second switch tube (S2), the third switch tube (S3), the second synchronous rectifier tube (SR2), and the third synchronous rectifier tube (SR3) to be synchronously turned on or off, wherein the first control signal and the second control signal also make the first switch tube (S1) and the second switch tube (S2) complementary to each other.

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