Dual half-bridge dc converter integrated structure and control method thereof

Abstract

The application discloses a kind of double half-bridge DC converter integrated structures, including input DC power Vin, first switch tube S1, second switch tube S2, third switch tube S3, fourth switch tube S4, first resonant unit circuit, second resonant unit circuit, transformer T, first synchronous rectifier SR1, second synchronous rectifier SR2, third synchronous rectifier SR3, fourth synchronous rectifier SR4, first output filter capacitor Co1 and second output filter capacitor Co2, wherein, transformer T includes first primary winding PT1, second primary winding PT2, first secondary winding ST1, second secondary winding ST2, third secondary winding ST3, fourth secondary winding ST4.The application realizes the full cycle work of transformer winding, and winding utilization rate is high, and realizes the shortest AC path of winding, and high efficiency and high power density, effectively reduce winding loss and floor area, and control is simple, reliability is high, easy to realize.

Description

TECHNICAL FIELD

[0001] The present application 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

[0002] With the development of artificial intelligence, 5G, Internet of Things, blockchain and other technologies, the global computing power demand will continue to grow. The power consumption of large-capacity data centers will also be increasingly high. The traditional 12V power supply architecture cannot adapt to the development of new generation data center technologies due to problems such as multi-stage conversion and serious line loss. The use of 48V power supply system architecture can not only reduce the number of system power conversion stages, but also significantly reduce line loss, and is more suitable for large-capacity data center requirements. Studies have shown that the use of 48V power supply system architecture to replace the traditional 12V architecture can greatly improve the efficiency of the power supply system.

[0003] Due to the maturity of low-voltage high-current load point (POL) technology, the two-stage solution of cascading POL in the intermediate bus converter has been widely applied. In the two-stage architecture, the two-stage bus architecture, the front-stage bus converter is mostly a DCX module, and the rear-stage is a POL converter outputting different voltages. In order to improve the efficiency of the POL and thus the overall efficiency, for the 48V bus architecture, the front-end bus converter needs to achieve a higher conversion ratio. The higher the conversion ratio of the converter, the larger the volume of the converter required, and the higher the loss. At the same time, the area of the server mainboard is fixed, and for the 48V bus power supply architecture, the position of the bus converter needs to be additionally increased on the already dense server mainboard, so the volume of the converter needs to be as small as possible. Therefore, the current research focus of the two-stage architecture is on the bus converter with high conversion ratio, high efficiency and high power density.

[0004] At present, the bus converter has been studied to some extent. For the transformer part in the bus converter, compared with the full-bridge rectifier circuit, the full-wave rectifier circuit has fewer rectifier tubes and smaller end termination loss, and has been more widely applied. However, the secondary winding of the full-wave rectifier circuit only works half of the time in each mode, and the utilization rate of the winding is low. In addition, as the power increases, the winding occupies more and more area, and the winding loss becomes larger and larger, which limits the efficiency and power density of the converter. SUMMARY

[0005] In view of the problems existing in the prior art, the purpose of the present application is to provide a dual half-bridge DC converter integrated structure and a control method thereof, which have higher winding utilization rate, smaller area and lower loss.

[0006] In order to achieve the above-mentioned application purpose, the present application provides the following technical solutions:

[0007] The application discloses a double-half-bridge direct-current converter integrated structure, which comprises an input direct-current power 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 SR1, a second synchronous rectifier SR2, a third synchronous rectifier SR3, a fourth synchronous rectifier 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 direct-current power 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, is 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, is 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 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 direct-current power Vin is connected to the first end of the first secondary winding ST1 through the first synchronous rectifier SR1, is connected to the second end of the third secondary winding ST3 and the second end of the fourth secondary winding ST4 through the first output filter capacitor Co1, is connected to the first end of the second secondary winding ST2 and the second end of the first primary winding PT1 through the second synchronous rectifier SR2, is connected to the first end of the third secondary winding ST3 through the third synchronous rectifier SR3, and is connected to the second end of the first secondary winding ST1 and the second end of the second secondary winding ST2 through the second output filter capacitor Co2, and is connected to the first end of the fourth secondary winding ST4 and the second end of the second primary winding PT2 through the fourth synchronous rectifier SR4.

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

[0010] Further, the first primary winding PT1 and the second primary winding PT2 are wound N turns around the magnetic core N, and the first secondary winding ST1, the second secondary winding ST2, the third secondary winding ST3 and the fourth secondary winding ST4 are wound 1 / 2 turn around the magnetic core, wherein N is a positive integer.

[0011] Further, the drain of the first switch tube S1 is connected to the positive pole of the input DC power Vin, and the source thereof is connected to the drain of the second switch tube S2 and the first end of the first resonant unit circuit respectively.

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

[0013] Further, the source of the first synchronous rectification tube SR1 is connected to the negative pole of the input DC power Vin, and the drain thereof is connected to the first end of the first secondary winding ST1; the source of the second synchronous rectification tube SR2 is connected to the negative pole of the input DC power Vin, and the drain thereof is connected to the first end of the first secondary winding ST2 and the second end of the first primary winding PT1 respectively.

[0014] Further, the source of the third synchronous rectification tube SR3 is connected to the negative pole of the input DC power Vin, and the drain thereof is connected to the first end of the third secondary winding ST3; the source of the fourth synchronous rectification tube SR4 is connected to the negative pole of the input DC power Vin, and the drain thereof is connected to the first end of the fourth secondary winding ST4 and the second end of the second primary winding PT2 respectively.

[0015] Further, the first resonant unit circuit comprises a first resonant inductor Lr1 and a first resonant capacitor Cr1, the first end of the first resonant inductor Lr1 is 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 is the second end of the first resonant unit circuit.

[0016] Further, the second resonant unit circuit comprises a second resonant inductor Lr2 and a second resonant capacitor Cr2, the first end of the second resonant inductor Lr2 is 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 is the second end of the second resonant unit circuit.

[0017] A control method based on the above-mentioned double half-bridge DC converter integrated structure, the method inputs a first control signal to the gate of the first switch tube S1, the fourth switch tube S4, the first synchronous rectification tube SR1 and the fourth synchronous rectification tube SR4, controls the synchronous conduction or turn-off of the first switch tube S1, the fourth switch tube S4, the first synchronous rectification tube SR1 and the fourth synchronous rectification tube SR4; inputs a second control signal to the gate of the second switch tube S2, the third switch tube S3, the second synchronous rectification tube SR2 and the third synchronous rectification tube SR3, controls the synchronous conduction or turn-off of the second switch tube S2, the third switch tube S3, the second synchronous rectification tube SR2 and the third synchronous rectification tube SR3, wherein the first control signal and the second control signal also make the first switch tube S1 and the second switch tube S2 conduct complementarily.

[0018] Compared with the prior art, the converter of the present application has the advantages that all the windings of the transformer of the converter work in a full cycle, and the utilization rate of the windings is high; the secondary winding of the transformer realizes the shortest AC path, further reducing the volume and loss; the converter can work at high frequency, effectively reducing the floor area and weight of the transformer, and realizing high power density; the magnetic flux of all the magnetic cores is fixed and can be the same, and the magnetic integration is easy to realize, which can support the realization of high power density. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The circuit diagram of one embodiment of the double half-bridge DC converter integrated structure provided by the present application;

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

[0021] Figure 3 The schematic diagram of the double half-bridge DC converter integrated structure provided by the present application working in mode 1;

[0022] Figure 4 The schematic diagram of the double half-bridge DC converter integrated structure provided by the present application working in mode 2;

[0023] Figure 5 The schematic diagram of the double half-bridge DC converter integrated structure provided by the present application working in mode 3;

[0024] Figure 6 The schematic diagram of the double half-bridge DC converter integrated structure provided by the present application working in mode 4. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0026] The embodiment of the present application provides a double half-bridge direct current converter integrated structure, which is composed of an input direct current power 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 SR1, a second synchronous rectifier SR2, a third synchronous rectifier SR3, a fourth synchronous rectifier SR4, a first output filter capacitor Co1 and a second output filter capacitor Co2. Figure 1

[0027] 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 N turns, the second primary winding PT2 is counterclockwise around the magnetic core N turns, and N is a positive integer. The first secondary winding ST1 is counterclockwise around the magnetic core 1 / 2 turn, the second secondary winding ST2 is clockwise around the magnetic core 1 / 2 turn, the third secondary winding ST3 is clockwise around the magnetic core 1 / 2 turn, and the fourth secondary winding ST4 is counterclockwise around the magnetic core 1 / 2 turn. In other embodiments, the winding direction of each winding can be other direction or other number of 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 electrode of the first switch tube S1 is connected to the positive electrode of the input DC power Vin, the source electrode of the first switch tube S1 is connected to the drain electrode of the second switch tube S2 and one end of the first resonance capacitor Cr1, the source electrode of the second switch tube S2 is connected to the drain electrode of the first synchronous rectifier SR1, the other end of the first resonance capacitor Cr1 is connected to one end of the first resonance inductor Lr1, the other end of the first resonance inductor Lr1 is connected to one end of the first primary winding PT1, the other end of the first primary winding PT1 is connected to the drain electrode of the second synchronous rectifier SR2; the drain electrode of the third switch tube S3 is connected to the positive electrode of the input DC power Vin, the source electrode of the third switch tube S3 is connected to the drain electrode of the fourth switch tube S4 and one end of the second resonance capacitor Cr2, the source electrode of the fourth switch tube S4 is connected to the drain electrode of the third synchronous rectifier SR3, the other end of the second resonance capacitor Cr2 is connected to one end of the second resonance inductor Lr2, the other end of the second resonance inductor Lr2 is connected to one end of the second primary winding PT2, the other end of the second primary winding PT2 is connected to the drain electrode of the fourth synchronous rectifier SR4; one end of the second secondary winding ST2 is connected to the drain electrode of the second synchronous rectifier SR2, and the other end thereof is connected to one end of the second output filter capacitor Co2, the other end of the second output filter capacitor Co2 is connected to the source electrode of the third synchronous rectifier SR3, the drain electrode of the third synchronous rectifier SR3 is connected to one end of the third secondary winding ST3, the other end of the third secondary winding ST3 is connected to one end of the first output filter capacitor Co1, the other end of the first output filter capacitor Co1 is connected to the source electrode 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 arranged clockwise around the magnetic core to form one turn; one end of the fourth secondary winding ST4 is connected to the drain electrode of the fourth synchronous rectifier SR4, the other end of the fourth secondary winding ST4 is connected to one end of the first output filter capacitor Co1, the other end of the first output filter capacitor Co1 is connected to the source electrode of the first synchronous rectifier SR1, the drain electrode of the first synchronous rectifier SR1 is connected to one end of the first secondary winding ST1, the other end of the first secondary winding ST1 is connected to one end of the second output filter capacitor Co2, the other end of the second output filter capacitor Co2 is connected to the source electrode 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 arranged 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 Vin.

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

[0030] In specific implementations, all switching transistors should be semiconductor switching devices with parasitic body diodes, such as metal oxide semiconductor field effect transistors, etc. If the selected switching transistor does not have a parasitic body diode, anti-parallel diodes should be connected across 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 inputted 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; and a second control signal needs to be 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 cause the first switch tube S1 and the second switch tube S2 to be complementarily turned on. In addition, the switching 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 four operating modes within one switching cycle.

[0033] like Figure 3 As shown, switching mode 1 [t0, t1]: at time t0, 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 time t1, half of the resonant cycle is completed. In this mode, the fourth synchronous rectifier tube SR4, the fourth secondary winding ST4, the first output filter capacitor Co1, the first synchronous rectifier tube SR1, the first secondary winding ST1, and the second output filter capacitor Co2 are sequentially arranged counterclockwise around the magnetic core to form a closed AC circuit with one turn.

[0034] like Figure 4As shown in the figure, switch mode 2 [t1, t2]: at t1, the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier SR1, the fourth synchronous rectifier SR4 are closed, the resonant current charges the drain-source capacitance of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier SR1, the fourth synchronous rectifier SR4, and the drain-source capacitance of the second switch tube S2, the third switch tube S3, the second synchronous rectifier SR2, the third synchronous rectifier SR3 is discharged to t2.

[0035] As shown in the figure, Figure 5 Switch mode 3 [t2, t3]: at t2, the second switch tube S2, the third switch tube S3, the second synchronous rectifier SR2, the third synchronous rectifier 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 t1, a half resonant period 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, the first output filter capacitor Co1 sequentially clockwise around the magnetic core to form a closed alternating current loop of 1 turn.

[0036] As shown in the figure, Figure 6 Switch mode 4 [t3, t4]: at t3, the second switch tube S2, the third switch tube S3, the second synchronous rectifier SR2, the third synchronous rectifier SR3 are closed, the resonant current charges the drain-source capacitance of the second switch tube S2, the third switch tube S3, the second synchronous rectifier SR2, the third synchronous rectifier SR3, and the drain-source capacitance of the first switch tube S1, the fourth switch tube S4, the first synchronous rectifier SR1, the fourth synchronous rectifier SR4 is discharged to t4.

[0037] The voltage gain of the double half-bridge DC converter integrated structure 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 application, by adopting the double half-bridge DC converter integrated structure, compared with the traditional converter structure, the winding loss can be reduced by 30%, the converter area can be reduced by 25%, and the efficiency and power density of the converter are effectively improved.

[0041] It should be noted that in this paper, relationship terms such as first and second are only 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 the entities or operations.

[0042] It should be noted that the above-mentioned embodiments and description of the application are only intended to illustrate the principles of the application and its main features and advantages, and various modifications and improvements can be made to the application without departing from the spirit and scope of the application, and these modifications and improvements shall fall within the scope of the application.

Claims

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

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

3. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: The first primary winding (PT1) and the second primary winding (PT2) are wound N turns around the magnetic core, and the first secondary winding (ST1), the second secondary winding (ST2), the third secondary winding (ST3) and the fourth secondary winding (ST4) are each wound 1 / 2 turn around the magnetic core, and N is a positive integer.

4. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: The drain of the first switch tube (S1) is connected to the positive pole of the input DC power supply (Vin), and the source is connected to the drain of the second switch tube (S2) and the first end of the first resonant unit circuit respectively.

5. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: The drain of the third switch tube (S3) is connected to the positive pole of the input DC power supply (Vin), and the source is connected to the drain of the fourth switch tube (S4) and the first end of the second resonant unit circuit respectively.

6. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: The source of the first synchronous rectifier (SR1) is connected to the negative pole 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 pole of the input DC power supply (Vin), and the drain is connected to the first end of the first secondary winding (ST2) and the second end of the first primary winding (PT1) respectively.

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

8. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: 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) is 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) is the second end of the first resonant unit circuit.

9. The dual half-bridge dc-to-dc converter integrated structure of claim 1, wherein: 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) is 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) is the second end of the second resonant unit circuit.

10. A control method based on the integrated structure of the dual half-bridge DC converter of claim 1, characterized in that: The gates of the first switch tube (S1), the fourth switch tube (S4), the first synchronous rectifier (SR1), and the fourth synchronous rectifier (SR4) are input with a first control signal to control the synchronous conduction or turn-off of the first switch tube (S1), the fourth switch tube (S4), the first synchronous rectifier (SR1), and the fourth synchronous rectifier (SR4). The gate of the second switch tube (S2), the third switch tube (S3), the second synchronous rectifier (SR2) and the third synchronous rectifier (SR3) is input with a second control signal, and the second switch tube (S2), the third switch tube (S3), the second synchronous rectifier (SR2) and the third synchronous rectifier (SR3) are controlled to be synchronously turned on or turned 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 be turned on.

Images