A phase-shifted full-bridge resonant three-port converter

Abstract

This invention provides a phase-shifted full-bridge resonant three-port converter, which integrates a phase-shifted full-bridge converter and a resonant converter into one unit through circuit multiplexing technology. The resonant branch suppresses the circulating current on the primary side of the phase-shifted full-bridge converter module. During the duty cycle conduction period, energy is mainly transferred through the phase-shifted full-bridge converter module. During the circulating current phase, the resonant current of the phase-shifted full-bridge converter module is coupled to the resonant converter module and output through the resonant converter module, thus optimizing the power transmission path. The excitation current in the resonant converter module can assist the lagging bridge arm in achieving zero-voltage switching across the entire load range. This solves the problems of narrow zero-voltage switching range and large circulating current in the phase-shifted full-bridge converter while improving the converter's energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of switching power supply technology, and in particular to a phase-shifted full-bridge resonant three-port converter. Background Technology

[0002] Phase-Shifted Full Bridge (PSFB) converters, with their electrical isolation, soft-switching capabilities, and efficient and reliable power transfer characteristics, have become a core topology in the field of Direct Current to Direct Current (DCDC) converters. However, traditional PSFB converters inevitably face many limitations in the energy conversion process, including a narrow zero-voltage switching range, large primary-side circulating current, and duty cycle losses that limit load regulation performance. Solutions to these problems are often conflicting, requiring trade-offs during design. In port-side applications, recent research has focused on addressing these challenges through topology integration, advanced modulation strategies, and the introduction of resonant elements.

[0003] To address the aforementioned issues, some researchers have combined PSFB with dual active bridge converters to create a hybrid topology that effectively extends the zero-voltage switching range. This modular multilevel structure can provide higher power density for high-voltage applications such as multi-port charging stations for electric vehicles or power electronic transformers based on modular multilevel converters. However, these solutions primarily focus on functional integration and do not optimize for circulating current issues; problems such as limited soft-switching range and duty cycle losses remain unresolved. Other researchers have introduced a "three-degree-of-freedom" modulation strategy for a three-port PSFB topology, achieving zero-voltage switching for all switching devices across a wide power and voltage range without the need for additional resonant components, effectively suppressing circulating current and compensating for duty cycle losses. However, this solution requires a complex modulation strategy, which reduces system reliability to some extent. Other researchers have combined LLC resonant topology with PSFB topology and adopted a hybrid modulation strategy of "modulation + phase shift" to achieve zero-voltage switching across the entire load range while effectively suppressing ineffective circulating current. Nevertheless, in this scheme, the energy transmitted through both the PSFB module and the LLC module must flow through the switching device, which not only increases the current stress on the switching device but also weakens the design advantage brought about by minimizing circulating current. Summary of the Invention

[0004] This invention provides a phase-shifted full-bridge resonant three-port converter, which aims to improve the energy utilization efficiency of the converter while solving the problems of narrow ZVS range and large circulating current in phase-shifted full-bridge converters.

[0005] To achieve the above objectives, the present invention provides a phase-shifted full-bridge resonant three-port converter, comprising: Power supply, input capacitor, phase-shifted full-bridge converter module, resonant converter module, resonant branch, first load resistor, second load resistor; The phase-shifting full-bridge converter module and the resonant converter module share a set of bridge arms; The positive terminal of the power supply is connected to the first terminal of the input capacitor, the first input terminal of the phase-shifted full-bridge converter module, and the first input terminal of the resonant converter module, respectively. The negative terminal of the power supply is connected to the second terminal of the input capacitor, the second input terminal of the phase-shifted full-bridge converter module, and the second input terminal of the resonant converter module, respectively. The first output terminal of the phase-shifted full-bridge converter module is connected to the input terminal of the resonant branch, the second output terminal of the phase-shifted full-bridge converter module is connected to the positive terminal of the first load resistor, and the third output terminal of the phase-shifted full-bridge converter module is connected to the negative terminal of the first load resistor. The first output terminal of the resonant converter module is connected to the second terminal of the resonant branch and the third input terminal of the phase-shifted full-bridge converter module, respectively. The second output terminal of the resonant converter module is connected to the positive terminal of the second load resistor, and the third output terminal of the resonant converter module is connected to the negative terminal of the second load resistor.

[0006] Furthermore, the phase-shifting full-bridge converter module includes a leading half-bridge unit, a lagging half-bridge unit, a first transformer, a first rectifier diode, a second rectifier diode, an output inductor, and a first output filter capacitor; The first end of the lag half-bridge unit is the first end of the resonant converter module, and the second end of the lag half-bridge unit is the second end of the resonant converter module; The first terminal of the leading half-bridge unit is connected to the positive terminal of the power supply, the first terminal of the input capacitor, and the first terminal of the lagging half-bridge unit, respectively. The second terminal of the leading half-bridge unit is connected to the negative terminal of the power supply, the second terminal of the input capacitor, the second terminal of the lagging half-bridge unit, and the second input terminal of the resonant converter module, respectively. The third terminal of the advanced half-bridge unit is connected to the first terminal of the resonant branch and the first terminal of the primary side of the first transformer, respectively. The third terminal of the lagging half-bridge unit is connected to the second terminal of the resonant branch and the second terminal of the primary side of the first transformer, respectively. The first end of the secondary side of the first transformer is connected to the anode of the first rectifier diode. The cathode of the first rectifier diode is connected to the first end of the output inductor and the cathode of the second rectifier diode, respectively. The second end of the output inductor is connected to the first end of the first output filter capacitor and the positive terminal of the first load resistor, respectively. The second terminal of the secondary side of the first transformer is connected to the second terminal of the first output filter capacitor and the negative terminal of the first load resistor, respectively. The third terminal of the secondary side of the first transformer is connected to the anode of the second rectifier diode.

[0007] Furthermore, the advanced half-bridge unit includes a first switching transistor and a second switching transistor; The drain of the first switching transistor is connected to the positive terminal of the power supply, the first terminal of the input capacitor, and the first terminal of the hysteresis half-bridge unit. The source of the first switching transistor is connected to the drain of the second switching transistor and the first end of the primary side of the first transformer; The source of the second switching transistor is connected to the negative terminal of the power supply, the second terminal of the input capacitor, and the second terminal of the hysteresis half-bridge unit, respectively.

[0008] Furthermore, the resonant converter module includes a hysteresis half-bridge unit, a DC blocking capacitor, a first resonant inductor, a magnetizing inductor, a second transformer, a third rectifier diode, a fourth rectifier diode, and a second output filter capacitor; The first terminal of the lagging half-bridge unit is connected to the drain of the first switching transistor; The second terminal of the hysteresis half-bridge unit is connected to the source of the second switching transistor, the second terminal of the magnetizing inductor, and the second terminal of the primary side of the second transformer, respectively. The fourth terminal of the lagging half-bridge unit is connected to the first terminal of the DC blocking capacitor, the second terminal of the DC blocking capacitor is connected to the first terminal of the first resonant inductor, and the second terminal of the first resonant inductor is connected to the first terminal of the magnetizing inductor and the first terminal of the primary side of the second transformer, respectively. The first end of the secondary side of the second transformer is connected to the anode of the third rectifier diode, and the cathode of the third rectifier diode is connected to the cathode of the fourth rectifier diode, the first end of the second output filter capacitor, and the positive terminal of the second load resistor, respectively. The second terminal of the secondary side of the second transformer is connected to the second terminal of the second output filter capacitor and the negative terminal of the second load resistor, respectively. The third terminal of the secondary side of the second transformer is connected to the anode of the fourth rectifier diode.

[0009] Furthermore, the lagging half-bridge unit includes a third switch and a fourth switch; The drain of the third switching transistor is connected to the drain of the first switching transistor; The source of the third switch is connected to the drain of the fourth switch, the first terminal of the DC blocking capacitor, the second terminal of the resonant branch, and the second terminal of the primary side of the first transformer, respectively. The source of the fourth switching transistor is connected to the source of the second switching transistor, the second terminal of the magnetizing inductor, and the second terminal of the primary side of the second transformer, respectively.

[0010] Furthermore, the resonant branch includes a first resonant capacitor and a second resonant inductor; The first terminal of the first resonant capacitor is connected to the source of the first switching transistor and the first terminal of the primary side of the first transformer, respectively; the second terminal of the first resonant capacitor is connected to the first terminal of the second resonant inductor. The second terminal of the second resonant inductor is connected to the source of the third switch and the second terminal of the primary side of the first transformer, respectively.

[0011] Furthermore, the second resonant inductor and the first resonant inductor constitute a coupled inductor.

[0012] Furthermore, the resonant current in the phase-shifted full-bridge converter module is coupled to the resonant converter module through a coupling inductor.

[0013] Furthermore, the power transfer of the phase-shifted full-bridge converter module occurs during the period when the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is equal to the input voltage. When the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is zero, the phase-shifted full-bridge converter module does not transmit power, but couples the resonant current to the resonant converter module through the resonant branch.

[0014] Furthermore, the process of obtaining the output current of the resonant converter module is as follows: The resonant current is obtained by coupling inductors; The coupling current is obtained by superimposing the resonant current with the current in the magnetizing inductor. The difference between the coupling current and the current in the magnetizing inductor is transmitted to the secondary side of the second transformer through the second transformer, generating a secondary rectified current. The output current of the resonant converter module is calculated using the secondary-side rectified current.

[0015] The above-described solution of the present invention has the following beneficial effects: Compared with existing technologies, this invention integrates a phase-shifted full-bridge converter and a resonant converter into one unit through circuit multiplexing technology. The resonant branch suppresses the circulating current on the primary side of the phase-shifted full-bridge converter module. During the duty cycle conduction period, energy is mainly transferred through the phase-shifted full-bridge converter module. During the circulating current phase, the resonant current of the phase-shifted full-bridge converter module is coupled to the resonant converter module and output through the resonant converter module, thus optimizing the power transmission path. The excitation current in the resonant converter module can assist the lagging bridge arm in achieving zero-voltage switching across the entire load range. This solves the problems of narrow zero-voltage switching range and large circulating current in phase-shifted full-bridge converters while improving the energy utilization efficiency of the converter.

[0016] Other beneficial effects of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 This is a topology diagram of a phase-shifted full-bridge resonant three-port converter; Figure 2 The waveform diagram shows the operation of a phase-shifted full-bridge resonant three-port converter. Detailed Implementation

[0018] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] This invention addresses existing problems by providing a phase-shifted full-bridge resonant three-port converter.

[0023] like Figure 1 As shown, an embodiment of the present invention provides a phase-shifted full-bridge resonant three-port converter, comprising: Power supply, input capacitor C in Phase-shifting full-bridge converter module, resonant converter module, resonant branch, first load resistor R o1 Second load resistor R o2 ; The phase-shifting full-bridge converter module and the resonant converter module share a set of bridge arms; The positive terminal of the power supply is connected to the input capacitor C.in The first terminal of the phase-shifted full-bridge converter module and the first input terminal of the resonant converter module are connected; The negative terminal of the power supply is connected to the input capacitor C. in The second terminal of the phase-shifted full-bridge converter module and the second input terminal of the resonant converter module are connected; The first output terminal of the phase-shifted full-bridge converter module is connected to the input terminal of the resonant branch, and the second output terminal of the phase-shifted full-bridge converter module is connected to the first load resistor R. o1 The positive terminal is connected to the third output terminal of the phase-shifted full-bridge converter module, which is connected to the first load resistor R. o1 The negative terminal connection; The first output terminal of the resonant converter module is connected to the second terminal of the resonant branch and the third input terminal of the phase-shifted full-bridge converter module, respectively. The second output terminal of the resonant converter module and the second load resistor R o2 The positive terminal is connected, and the third output terminal of the resonant converter module is connected to the second load resistor R. o2 The negative terminal connection.

[0024] Specifically, the phase-shifting full-bridge converter module includes a leading half-bridge unit, a lagging half-bridge unit, and a first transformer T. r1 First rectifier diode D1, second rectifier diode D2, output inductor Lo1, first output filter capacitor C o1 ; The first end of the lag half-bridge unit is the first end of the resonant converter module, and the second end of the lag half-bridge unit is the second end of the resonant converter module; The first terminal of the advanced half-bridge unit is connected to the positive terminal of the power supply and the input capacitor C, respectively. in The first end of the lagging half-bridge unit is connected; The second terminal of the advanced half-bridge unit is connected to the negative terminal of the power supply and the input capacitor C, respectively. in The second terminal of the lag half-bridge unit is connected to the second input terminal of the resonant converter module; The third terminal of the advanced half-bridge unit is connected to the first terminal of the resonant branch and the first transformer T, respectively. r1 Connect the first end of the primary edge; The third terminal of the lag half-bridge unit is connected to the second terminal of the resonant branch and the first transformer T, respectively. r1 The second end of the primary edge is connected; First transformer T r1 The first end of the secondary side is connected to the anode of the first rectifier diode D1, and the cathode of the first rectifier diode D1 is connected to the output inductor L. o1 The first terminal and the cathode of the second rectifier diode D2 are connected, and the output inductor L o1 The second terminal is connected to the first output filter capacitor C respectively. o1First terminal, first load resistor R o1 The positive terminal connection; First transformer T r1 The second terminal of the secondary side is connected to the first output filter capacitor C. o1 The second terminal, the first load resistor R o1 The negative terminal connection; First transformer T r1 The third terminal of the secondary side is connected to the anode of the second rectifier diode D2.

[0025] Specifically, the advanced half-bridge unit includes a first switch S1 and a second switch S2; The drain of the first switching transistor S1 is connected to the positive terminal of the power supply and the input capacitor C. in The first end of the lagging half-bridge unit is connected; The source of the first switch S1 and the drain of the second switch S2, and the first transformer T r1 Connect the first end of the primary edge; The source of the second switch S2 is connected to the negative terminal of the power supply and the input capacitor C, respectively. in The second end is connected to the second end of the lag half-bridge unit.

[0026] Specifically, the resonant converter module includes a hysteresis half-bridge unit and a DC blocking capacitor C. b First resonant inductor L r1 Magnetizing inductance L m Second transformer T r2 Third rectifier diode D3, fourth rectifier diode D4, second output filter capacitor C o2 ; The first terminal of the lagging half-bridge unit is connected to the drain of the first switching transistor S1; The second terminal of the hysteresis half-bridge unit is connected to the source of the second switch S2 and the magnetizing inductor L, respectively. m The second end, the second transformer T r2 The second end of the primary edge is connected; The fourth terminal of the hysteresis half-bridge unit is connected to the DC blocking capacitor C. b The first terminal is connected to the DC blocking capacitor C. b The second terminal is connected to the first resonant inductor L r1 The first end is connected to the first resonant inductor L. r1 The second terminal is connected to the magnetizing inductor L. m First end, second transformer T r2 Connect the first end of the primary edge; Second transformer T r2 The first end of the secondary side is connected to the anode of the third rectifier diode D3, and the cathode of the third rectifier diode D3 is connected to the cathode of the fourth rectifier diode D4 and the second output filter capacitor C.o2 First terminal, second load resistor R o2 The positive terminal connection; Second transformer T r2 The second terminal of the secondary side is connected to the second output filter capacitor C. o2 The second terminal, the second load resistor R o2 The negative terminal connection; Second transformer T r2 The third terminal of the secondary side is connected to the anode of the fourth rectifier diode D4.

[0027] Furthermore, the lagging half-bridge unit includes a third switch S3 and a fourth switch S4; The drain of the third switch S3 is connected to the drain of the first switch S1. The source of the third switch S3 is connected to the drain of the fourth switch S4 and the DC blocking capacitor C, respectively. b The first terminal, the second terminal of the resonant branch, and the first transformer T r1 The second end of the primary edge is connected; The source of the fourth switch S4 is connected to the source of the second switch S2 and the magnetizing inductor L, respectively. m The second end, the second transformer T r2 Connect the second end of the original side.

[0028] In this embodiment of the invention, the DC blocking capacitor C b It does not participate in the resonance process; the resonant current in the resonant converter module is entirely provided by the resonant branch.

[0029] Specifically, the resonant branch includes the first resonant capacitor C. r1 Second resonant inductor L r2 ; First resonant capacitor C r1 The first terminal is connected to the source of the first switching transistor S1 and the first transformer T, respectively. r1 The first end of the primary side is connected to the first resonant capacitor C. r1 The second terminal and the second resonant inductor L r2 The first end is connected; Second resonant inductor L r2 The second terminal is connected to the source of the third switch S3 and the first transformer T, respectively. r1 Connect the second end of the original side.

[0030] Specifically, the second resonant inductor L r2 With the first resonant inductor L r1 This constitutes a coupled inductor.

[0031] Specifically, the resonant current in the phase-shifted full-bridge converter module is coupled to the resonant converter module through a coupling inductor.

[0032] The phase-shifted full-bridge resonant three-port converter provided in this embodiment of the invention adopts a hybrid modulation strategy of "phase shift + frequency conversion". Since there is a phase shift angle between the leading half-bridge unit and the lagging half-bridge unit in the phase-shifted full-bridge converter module, meaning the phase of the leading half-bridge unit leads the lagging half-bridge unit by a certain angle, the duty cycle is controlled by adjusting this angle, thereby adjusting the output voltage of the phase-shifted full-bridge converter module. The duty cycle is defined as the proportion of the time that the first switch S1 and the fourth switch S4 are simultaneously turned on to the entire cycle. The midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is... Its waveform is as follows Figure 2 As shown.

[0033] Specifically, the power transfer of the phase-shifted full-bridge converter module occurs during the period when the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is equal to the input voltage, that is, during the period when the first switch S1 and the fourth switch S4 are simultaneously turned on. When the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is zero, the phase-shifted full-bridge converter module does not transmit power, but couples the resonant current to the resonant converter module through the resonant branch.

[0034] Specifically, in this embodiment of the invention, the primary current in the phase-shifted full-bridge converter module is defined as follows: The first transformer T r1 The leakage inductance current is During the period when the midpoint voltage between the leading and lagging half-bridge units equals the input voltage, the voltage gain of the phase-shifted full-bridge converter module is: ; in, This indicates the voltage gain of the phase-shifted full-bridge converter module. This indicates the output voltage of the phase-shifted full-bridge converter module. Indicates the input voltage. Indicates the first transformer T r1 Number of turns, Indicates the duty cycle.

[0035] When the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit in the phase-shifted full-bridge converter module is zero, that is, during the period when the first switch S1 and the fourth switch S4 are not simultaneously turned on, the phase-shifted full-bridge converter module does not transfer energy. During this stage, the phase-shifted full-bridge resonant three-port converter provided in this embodiment of the invention reduces the primary-side circulating current of the phase-shifted full-bridge converter module through the resonant branch, i.e., as... Figure 2 shown exist The waveform of the stage, at the same time, the reduced part of the primary side circulating current can be coupled to the resonant converter module through the coupling inductor to realize energy transfer.

[0036] Specifically, the process of obtaining the output current of the resonant converter module is as follows: The resonant current is obtained by coupling inductors; Resonant current and excitation inductance L m The coupling current is obtained by superimposing the currents in the two phases; Through the second transformer T r2 The coupling current is related to the magnetizing inductance L m The difference in current is transmitted to the second transformer T. r2 The secondary side generates a secondary rectified current; The output current of the resonant converter module is calculated using the secondary-side rectified current.

[0037] Specifically, in this embodiment of the invention, the first resonant inductor L in the resonant transformation module is defined. r1 The current in is denoted as Magnetizing inductance L m The current in is denoted as When the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit in the phase-shifted full-bridge converter module is equal to zero, the current output by the resonant branch is... Coupled to the resonant converter module via a coupling inductor, and with Formed after superposition ;therefore, and The difference is passed through the second transformer T r2 The current is transmitted to the secondary side, thereby generating secondary-side rectified current. Output current It can be by The average value is calculated as follows: ; Therefore, the voltage gain of the resonant converter module It can be calculated as follows: ; Substitute into the voltage gain calculation expression The calculation expression can then be used to calculate... The size of it is not only related to the duty cycle. It is related to the switching frequency. This is relevant, therefore the duty cycle can be achieved. Adjusting the output of the phase-shifting full-bridge converter module Switching frequency Adjusting the output of the resonant converter module This enables independent control of the two output ports.

[0038] To achieve zero-voltage switching of the switching transistors, the charge on the junction capacitance of the switching transistors must be completely discharged to zero before turn-on. That is, in the phase-shifted full-bridge converter module, when the first switching transistor S1 or the second switching transistor S2 in the lead-half-bridge unit is turned on, the output filter inductor can be referred to the primary side and compared with the leakage inductance L. k Together they participate in the charging and discharging process of the junction capacitance of the switching transistor. Under normal circumstances, the output filter inductor has a sufficiently large inductance value to store enough energy, so that the first switching transistor S1 or the second switching transistor S2 can easily meet the ZVS condition. This will not be described in detail in the embodiments of the present invention.

[0039] For the third switch S3 and the fourth switch S4 in the lag half-bridge unit, the embodiments of the present invention can achieve zero-voltage switching through the excitation current of the resonant converter module. For example, at time t0, the ZVS condition of the fourth switch S4 can be expressed as follows: ; in, Indicates the junction capacitance of the switching transistor; Since the ZVS conditions for the third switch S3 and the fourth switch S4 are the same, both can be achieved using the magnetizing current. The size is related to the first resonant inductance L r1 And excitation inductance L m The value is related to the excitation current, so it can be substituted into the calculation. The ZVS conditions for the third switch S3 and the fourth switch S4 in the lag half-bridge unit can be expressed as follows: ; The formula takes into account the leakage inductance energy of the transformer in the phase-shifted full-bridge converter module. It can be seen that even under light load conditions where the leakage inductance energy can be ignored, the excitation current in the resonant converter module can be made sufficient to achieve light load ZVS through reasonable design.

[0040] Compared with the prior art, the embodiments of the present invention integrate the phase-shifted full-bridge converter and the resonant converter into one unit through circuit multiplexing technology. The circulating current on the primary side of the phase-shifted full-bridge converter module is suppressed by the resonant branch. During the duty cycle conduction period, energy is mainly transferred through the phase-shifted full-bridge converter module. During the circulating current stage, the resonant current of the phase-shifted full-bridge converter module is coupled to the resonant converter module and output through the resonant converter module, thus optimizing the power transmission path. The excitation current in the resonant converter module can assist the lagging bridge arm to achieve zero-voltage switching across the entire load range. Therefore, the problem of narrow zero-voltage switching range and large circulating current of the phase-shifted full-bridge converter is solved, while improving the energy utilization efficiency of the converter.

[0041] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A phase-shifted full-bridge resonant three-port converter, characterized in that, include: Power supply, input capacitor, phase-shifted full-bridge converter module, resonant converter module, resonant branch, first load resistor, second load resistor; The phase-shifted full-bridge converter module includes a lead-up half-bridge unit, a first transformer, a first rectifier diode, a second rectifier diode, an output inductor, and a first output filter capacitor; The advanced half-bridge unit includes a first switching transistor and a second switching transistor; The resonant converter module includes a DC blocking capacitor, a first resonant inductor, a magnetizing inductor, a second transformer, a third rectifier diode, a fourth rectifier diode, and a second output filter capacitor; The resonant branch includes a first resonant capacitor and a second resonant inductor; The phase-shifting full-bridge converter module and the resonant converter module share a hysteresis half-bridge unit, wherein the first end of the hysteresis half-bridge unit is the first end of the resonant converter module, and the second end of the hysteresis half-bridge unit is the second end of the resonant converter module; The hysteresis half-bridge unit includes a third switch and a fourth switch; The positive terminal of the power supply is connected to the first terminal of the input capacitor, the drain of the first switching transistor, and the drain of the third switching transistor, respectively. The negative terminal of the power supply is connected to the second terminal of the input capacitor, the source of the second switching transistor, the source of the fourth switching transistor, the second terminal of the magnetizing inductor, and the second terminal of the primary side of the second transformer, respectively. The source of the first switching transistor is connected to the drain of the second switching transistor, the first terminal of the first resonant capacitor, and the first terminal of the primary side of the first transformer. The second end of the first resonant capacitor is connected to the first end of the second resonant inductor; The source of the third switch is connected to the drain of the fourth switch, the first terminal of the DC blocking capacitor, the second terminal of the second resonant inductor, and the second terminal of the primary side of the first transformer, respectively. The second terminal of the DC blocking capacitor is connected to the first terminal of the first resonant inductor; The first end of the secondary side of the first transformer is connected to the anode of the first rectifier diode, the cathode of the first rectifier diode is connected to the first end of the output inductor and the cathode of the second rectifier diode, and the second end of the output inductor is connected to the first end of the first output filter capacitor and the positive terminal of the first load resistor. The second end of the secondary side of the first transformer is connected to the second end of the first output filter capacitor and the negative terminal of the first load resistor, respectively. The third terminal of the secondary side of the first transformer is connected to the anode of the second rectifier diode; The first end of the secondary side of the second transformer is connected to the anode of the third rectifier diode, and the cathode of the third rectifier diode is connected to the cathode of the fourth rectifier diode, the first end of the second output filter capacitor, and the positive terminal of the second load resistor, respectively. The second terminal of the secondary side of the second transformer is connected to the second terminal of the second output filter capacitor and the negative terminal of the second load resistor, respectively. The third terminal of the secondary side of the second transformer is connected to the anode of the fourth rectifier diode; The second resonant inductor and the first resonant inductor form a coupled inductor.

2. The phase-shifted full-bridge resonant three-port converter according to claim 1, characterized in that, The resonant current in the phase-shifted full-bridge converter module is coupled to the resonant converter module through the coupling inductor.

3. The phase-shifted full-bridge resonant three-port converter according to claim 1, characterized in that, The power transfer of the phase-shifted full-bridge converter module occurs during the period when the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is equal to the input voltage. When the midpoint voltage between the leading half-bridge unit and the lagging half-bridge unit is zero, the phase-shifting full-bridge converter module does not transmit power, and the resonant current is coupled to the resonant converter module through the resonant branch.

4. The phase-shifted full-bridge resonant three-port converter according to claim 2, characterized in that, The process of obtaining the output current of the resonant converter module is as follows: The resonant current is obtained through the coupling inductor; The coupling current is obtained by superimposing the resonant current with the current in the magnetizing inductor. The difference between the coupling current and the current in the magnetizing inductor is transmitted to the secondary side of the second transformer through the second transformer, generating a secondary rectified current. The output current of the resonant converter module is calculated using the secondary-side rectified current.

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