Integrated power grid power supply multi-port converter and conversion control method

Abstract

The invention relates to the field of electronic converters, in particular to an integrated power grid power supply multi-port converter and a conversion control method. A power grid voltage is input into the rectification unit, the primary side module is provided with a full-bridge structure and an interlaced bidirectional structure, receives a DC voltage and is connected to an energy storage port, the secondary side module is connected to a load port, obtains a power grid voltage phase through a phase-locked loop, and generates a switching signal of a rectification circuit through double closed-loop control; voltage stabilization and current ripple reduction of an energy storage port are realized by adopting double closed-loop control and staggered phase shift control; the phase shift control generates a switching signal of the secondary side module. Power grid input, an energy storage port and a load port are subjected to single-stage power conversion to realize energy management, and energy loss of traditional multi-stage conversion is reduced due to efficient connection of the transformer. The 180-degree staggered phase shift driving mode enables the inductors to work alternately, reduces the current ripples of the energy storage port, and improves the energy transmission smoothness and the system efficiency.

Description

Technical Field

[0001] This invention relates to the field of electronic converters, and in particular to an integrated grid-powered multi-port converter and its conversion control method. Background Technology

[0002] Multi-port converters integrate multiple power supply and load ports, enabling efficient energy transfer and management between different ports, meeting the demands of modern power systems for high efficiency, high power density, and flexible dispatch.

[0003] Despite the progress made in existing technologies, there are still many shortcomings. Traditional multiport converters often adopt multi-stage topologies (such as DC-DC cascades or AC-DC-AC structures), resulting in multiple energy conversions, high system losses, and limited overall efficiency. To achieve soft switching or high efficiency, some designs introduce additional resonant components or complex circuits, which increases the size of the converter and makes it difficult to meet the requirements of high power density. The complex power flow and dynamic load changes of multiport systems require precise control strategies. Traditional control methods are difficult to balance response speed and stability, which increases the difficulty of design and implementation.

[0004] Therefore, there is a need for an integrated grid-connected multi-port converter and conversion control method that can reduce energy loss in traditional multi-stage conversion, improve energy transmission smoothness and system efficiency, and achieve precise regulation of load voltage, optimize voltage and current waveforms, and improve electromagnetic compatibility to meet the needs of the current environment. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] Given that the existing technologies mentioned above have high losses, limited overall efficiency, and large converter size, traditional multi-port converter systems are difficult to meet the requirements of high power density. Furthermore, traditional control methods are difficult to balance response speed and stability.

[0007] Therefore, the technical problem to be solved by this invention is to design an integrated grid power supply multi-port converter and conversion control method that can reduce the energy loss of traditional multi-stage conversion, improve the smoothness of energy transmission and system efficiency, and achieve precise regulation of load voltage, optimize voltage and current waveforms, and improve electromagnetic compatibility to meet the needs of the current environment.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an integrated grid-powered multi-port converter, comprising,

[0009] The mains input module 1 receives the mains voltage, which enters the rectifier unit 11 and is converted into DC voltage.

[0010] The primary side module 2 is equipped with a full-bridge structure and an interleaved bidirectional structure. It receives DC voltage and connects to the energy storage port 21 to realize energy storage and release.

[0011] The secondary module 3 includes a half-bridge structure and is connected to the load port 31 to achieve efficient energy transmission.

[0012] As an improvement of the present invention,

[0013] The primary side module 2 includes inductors L1 and L2, and switching transistors S1 to S4;

[0014] S1 and S2 form the first bridge arm. The drain of S1 is connected to the positive terminal of the DC voltage Vin, and the source of S2 is connected to the negative terminal of Vin. S3 and S4 form the second bridge arm. The drain of S3 is connected to the positive terminal of Vin, and the source of S4 is connected to the negative terminal of Vin.

[0015] One end of inductor L1 is connected to the common node of S1 and S2, and the other end is connected to energy storage port 21; one end of inductor L2 is connected to the common node of S3 and S4, and the other end is connected to energy storage port 21.

[0016] S1 and S2, and S3 and S4, use complementary driving signals respectively.

[0017] As an improvement of the present invention,

[0018] The primary side module 2 uses an interleaved drive method with a phase shift angle of 180 degrees to control S1 to S4;

[0019] The first and second bridge arms, composed of S1 and S2, and S3 and S4, have a phase difference of 180 degrees in their drive signals.

[0020] Inductors L1 and L2 are alternately energized and demagnetized to reduce the total current ripple at energy storage port 21.

[0021] As an improvement of the present invention,

[0022] Secondary-side module 3 includes switching transistors S5 to S6 and diodes D1 to D2;

[0023] The drain of S5 and the source of S6 are respectively connected to the other end of the secondary winding of the transformer, and the source of S5 is connected to the drain of S6.

[0024] The cathode of diode D1 is connected to the drain of S5, and the anode is connected to the negative terminal of load port 31. The cathode of diode D2 is connected to the source of S6, and the anode is connected to the negative terminal of load port 31.

[0025] The positive terminal of load port 31 is connected to the midpoint of the secondary winding of the transformer, and is used to supply power to the load by reflecting energy through the transformer.

[0026] As an improvement of the present invention,

[0027] A filter module 4 is installed in both the primary side module 2 and the secondary side module 3;

[0028] The filtering module 4 includes an input filtering capacitor 41, an energy storage port filtering capacitor 42, and a load port filtering capacitor 43.

[0029] Input filter capacitor 41 is connected in parallel across the DC voltage Vin to stabilize the DC voltage output;

[0030] The energy storage port filter capacitor 42 is connected in parallel across the two ends of the energy storage port 21 to smooth the corresponding voltage of the energy storage port 21.

[0031] The load port filter capacitor 43 is connected in parallel across the two ends of the load port 31 to stabilize the voltage of the load port 31.

[0032] The AC side filter inductor Lf is connected in series between the mains input module 1 and the rectifier unit 11.

[0033] A transformation control method, comprising:

[0034] The phase of the grid voltage is obtained by phase-locked loop, and the switching signal of the rectifier circuit is generated by dual closed-loop control to achieve DC voltage stabilization.

[0035] Dual closed-loop control and interleaved phase shift control are used to generate switching signals for the primary circuit, thereby stabilizing the voltage at the energy storage port and reducing current ripple.

[0036] Phase-shift control is used to generate switching signals for the secondary circuit, thereby stabilizing the load port voltage.

[0037] As an improvement of the present invention,

[0038] In the primary control process,

[0039] Actual control operations are performed based on the energy storage voltage Vbat and the inductor currents iL1 and iL2.

[0040] The outer loop voltage control compares Vbat with the target value to generate an error signal, while the inner loop current control adjusts iL1 and iL2 to optimize energy transfer.

[0041] As an improvement of the present invention,

[0042] In the staggered phase shift control process,

[0043] The interleaved phase shift control is a 180-degree phase shift, used to generate the PWM signals corresponding to S1 to S4 of the primary side module 2;

[0044] Inductors L1 and L2 work alternately to reduce the ripple of the total current ibat at energy storage port 21 and improve system efficiency.

[0045] As an improvement of the present invention,

[0046] In the phase shift control process,

[0047] Phase shift control adjusts the voltage phase shift angle between primary side module 2 and secondary side module 3 to generate PWM signals for secondary side switching transistors S5 to S6;

[0048] The corresponding PWM signal enables independent adjustment of the load voltage Vo, ensuring the stability of the drive signal corresponding to the primary side module 2.

[0049] As an improvement of the present invention,

[0050] In continuous conduction mode, there are three corresponding switching modes;

[0051] In Mode I, control switches S1 and S4 are turned on, inductor L1 is connected to DC voltage Vin through S1 and S4 for excitation, inductor L2 is demagnetized, and secondary module 3 supplies power to the load through S5 and diode D2.

[0052] In Mode II, the control switch S5 is turned off, and S6 is turned on with zero voltage. The secondary side module 3 is powered through S6 and diode D1.

[0053] In Mode III, control switches S1 and S4 are turned off, while S2 and S3 are turned on, allowing inductor L2 to be connected to Vin for excitation via S2 and S3. Inductor L1 is demagnetized, and secondary module 3 is powered through S6 and D1, achieving zero-voltage conduction.

[0054] The beneficial effects of this invention are as follows: Energy management is achieved through a single-stage power conversion of the grid input, energy storage port, and load port; efficient connection via a transformer reduces energy losses associated with traditional multi-stage conversion. A 180-degree staggered phase-shift drive method is employed, allowing inductors to work alternately, significantly reducing current ripple at the energy storage port and improving energy transfer smoothness and system efficiency. Zero-voltage conduction technology reduces switching losses and enables precise load voltage regulation. Input filter capacitor Cin, energy storage port capacitor Cbat, and load port capacitor Co are configured on the DC bus side, working in conjunction with AC-side filter inductor Lf to optimize voltage and current waveforms and improve electromagnetic compatibility. Attached Figure Description

[0055] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0056] Figure 1 This is a circuit architecture diagram of the integrated grid power supply multi-port converter in this invention.

[0057] Figure 2 This is a diagram illustrating the operation of the control mode of the transformation control method of the present invention.

[0058] Figure 3 This is a three-port power diagram of the integrated grid power supply multi-port converter in this invention.

[0059] Figure 4 This is a three-port voltage diagram of the integrated grid power supply multi-port converter in this invention.

[0060] Figure 5 The diagram shows the grid-connected current and voltage of the integrated grid power supply multi-port converter in this invention.

[0061] Figure 6 This is a waveform diagram of the interleaved inductor current of the integrated grid power supply multi-port converter in this invention.

[0062] Figure 7 The image shows the leakage inductance current waveform of the integrated grid power supply multi-port converter in this invention.

[0063] Figure 8 This is a basic working waveform diagram of the integrated grid power supply multi-port converter in this invention. Detailed Implementation

[0064] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0065] Example 1

[0066] Reference Figures 1-2 This embodiment provides an integrated grid-powered multi-port converter.

[0067] This solution integrates the secondary side module 3, transformer, energy storage port 21, and load port 31. The core objective of the converter is to achieve efficient energy transfer from the grid to the energy storage port and load port through single-stage power conversion, while ensuring voltage stability, low current ripple, and high power density.

[0068] The mains input module 1 is responsible for converting the AC mains voltage into a stable DC voltage, providing a foundation for subsequent energy transmission. The rectifier unit 11 uses a full-bridge rectifier circuit composed of switching transistors Sa, Sb, Sc, and Sd. The mains input voltage Vgrid is rated at 220V and a frequency of 50Hz.

[0069] The grid input voltage Vgrid is connected to the rectifier unit 11 through the AC-side filter inductor Lf. Lf is connected in series between the grid and the rectifier circuit to filter out high-frequency harmonics and improve electromagnetic compatibility. The rectifier unit 11 converts Vgrid into a DC voltage Vin, and connects it in parallel across Vin through the input filter capacitor Cin to further smooth the DC voltage and suppress voltage ripple.

[0070] The primary-side module 2 receives the DC voltage Vin output from the rectifier unit 11, is responsible for energy storage and release at the energy storage port 21, and achieves efficient power transfer through a full-bridge structure and interleaved bidirectional Buck / Boost circuits. The secondary-side module 3 transmits energy to the load port 31 through a half-bridge structure, and is responsible for the stable output of the load voltage Vo.

[0071] The transformer used in this design is a high-frequency transformer with a turns ratio of 1:1.1, connecting primary module 2 and secondary module 3. The primary winding connects to the output of the primary full-bridge structure, while the secondary winding connects to the input of the secondary half-bridge structure. The transformer enables efficient energy transfer from the primary to the secondary side, and simultaneously supports zero-voltage conduction through leakage inductance Lk, reducing switching losses.

[0072] The converter also includes an energy storage port 21 and a load port 31. The energy storage port 21 is connected to the output terminals of inductors L1 and L2 of the primary side module 2. In this scheme, the output voltage Vbat is 200V and the power Pbat is 1kW, which is used for the charging and discharging management of the energy storage system. Cbat ensures the stability of Vbat.

[0073] Load port 31 connects to the half-bridge output of secondary module 3, with an output voltage Vo of 300V and a power Po of 2.5kW, suitable for microgrid loads or DC fast charging equipment. Co ensures Vo stability and meets the requirements of high-precision loads.

[0074] To achieve power balance and voltage stability across the grid, energy storage, and load terminals, this scheme also employs a hierarchical control strategy, including grid-side control, primary-side control, and secondary-side control, combined with phase-locked loop, dual-loop control, and phase-shift control technologies.

[0075] A phase-locked loop (PLL) acquires the grid voltage phase, and dual closed-loop control generates the switching signal for the rectifier circuit to achieve DC voltage stability. Dual closed-loop control and interleaved phase-shift control are used to generate the switching signal for the primary circuit to achieve voltage stability and reduce current ripple at the energy storage port. Phase-shift control is used to generate the switching signal for the secondary circuit to achieve voltage stability at the load port.

[0076] Example 2

[0077] Reference Figures 1-8 This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0078] In this design, the primary side module includes two inductors L1 and L2 and four switching transistors S1 to S4. The first bridge arm consists of S1 and S2. The drain of S1 is connected to the positive terminal of the DC voltage Vin, and the source of S2 is connected to the negative terminal of Vin. The common node of S1 and S2 serves as the output of the first bridge arm.

[0079] The second bridge arm consists of S3 and S4. The drain of S3 is connected to the positive terminal of Vin, and the source of S4 is connected to the negative terminal of Vin. The common node of S3 and S4 serves as the output of the second bridge arm.

[0080] One end of inductor L1 is connected to the common node of S1 and S2, and the other end is connected to energy storage port 21; one end of inductor L2 is connected to the common node of S3 and S4, and the other end is connected to energy storage port 21. L1 and L2 are jointly responsible for the energy storage and release of energy at energy storage port 21. S1 and S2, and S3 and S4 use complementary drive signals, that is, S2 is turned off when S1 is on, and S4 is turned off when S3 is on, to ensure the safe operation of the bridge arm.

[0081] The first and second bridge arms adopt an interleaved drive method with a phase shift angle of 180 degrees, and the drive signals of the two bridge arms are 180 degrees out of phase. L1 and L2 are thus alternately energized and demagnetized, and the total current ibat = iL1 + iL2 at the energy storage port is significantly reduced.

[0082] Secondary module 3 supplies power to the load port through a half-bridge structure and is responsible for stabilizing the output voltage. The corresponding circuit composition includes switching transistors S5 and S6, as well as diodes D1 and D2.

[0083] The drain of S5 is connected to one end of the secondary winding of the transformer, the source of S5 is connected to the drain of S6, and the source of S6 is connected to the other end of the secondary winding of the transformer, forming a half-bridge structure. The cathode of D1 is connected to the drain of S5, and the anode is connected to the negative terminal of the load port 31; the cathode of D2 is connected to the source of S6, and the anode is connected to the negative terminal of the load port 31.

[0084] The positive terminal of load port 31 is connected to the midpoint of the secondary winding of the transformer, and the negative terminal is connected to the common point of the anodes of D1 and D2, thereby supplying power to the load through the energy reflected by the transformer.

[0085] In this scheme, the corresponding half-bridge structure adjusts the output voltage Vo of the load port 31 by controlling the on and off of S5 and S6, and uses the leakage inductance of the transformer to support zero-voltage conduction, thereby reducing switching losses.

[0086] The primary side module 2 and the secondary side module 3 are equipped with a filter module 4, which is used to stabilize the system voltage and current, improve output quality and electromagnetic compatibility.

[0087] Input filter capacitor 41 is connected in parallel across the DC voltage Vin to smooth Vin, suppress voltage ripple, and ensure the input stability of primary-side module 2. Energy storage port filter capacitor 42 is connected in parallel across the energy storage port 21 to smooth the energy storage port voltage Vbat, ensuring the stable operation of the energy storage system. Load port filter capacitor 43 is connected in parallel across the load port 31 to stabilize the load port 31 voltage Vo, suppress output voltage ripple, and meet the load's requirement for high-precision voltage.

[0088] The AC-side filter inductor Lf is connected in series between the grid input module and the rectifier unit to filter out high-frequency interference and optimize the grid-connected current waveform.

[0089] The converter structure in this embodiment realizes energy transmission from the power grid to the energy storage port 21 and the load port 31 through a single-stage power conversion.

[0090] The grid input module 1 rectifies the AC voltage Vgrid into a DC voltage Vin. The primary side module 2 manages the energy flow at the energy storage port 21 through a full-bridge and interleaved Buck / Boost structure, while simultaneously inputting energy to the primary side of the transformer. The secondary side module 3 obtains energy from the secondary side of the transformer through a half-bridge structure, stabilizing the output load voltage Vo. A 180-degree interleaved drive allows L1 and L2 to work alternately, reducing ibat ripple; filter capacitors Cin, Cbat, and Co ensure smooth voltage at each port; Lf optimizes the electromagnetic compatibility of the grid-connected current.

[0091] Example 3

[0092] Reference Figures 1-8 This embodiment is based on the previous embodiment, and differs from the previous embodiment in that:

[0093] To achieve power balance and voltage stability at the three ports of the power grid, energy storage, and load, this scheme also adopts a hierarchical control strategy.

[0094] In the grid-side control process, a phase-locked loop (PLL) and dual closed-loop control are used to generate switching signals for the rectifier circuit, thereby stabilizing the DC voltage Vin. The PLL acquires the phase information of the grid voltage Vgrid in real time and generates a synchronization signal to ensure that the converter is in phase with the grid, avoiding power factor degradation or harmonic interference.

[0095] The grid-side control process corresponds to a dual-closed-loop control section, with the outer loop corresponding to the voltage loop and the inner loop corresponding to the current loop. The voltage loop monitors the DC voltage Vin in real time, compares it with the target value, and generates a voltage error signal, which is used to adjust the input power of the rectifier circuit.

[0096] The current loop can optimize the control of the grid input current based on the voltage error signal, and finally generate the switching signal of rectifier circuit 1 to control the full-bridge rectifier circuit to convert Vgrid into a stable Vin.

[0097] In the primary-side control, dual closed-loop control and 180-degree staggered phase shift control are used to generate the corresponding switching signals for primary-side module 2, stabilizing the energy storage port voltage Vbat and reducing current ripple. Similarly, the outer loop corresponds to the voltage loop, and the inner loop corresponds to the current loop.

[0098] The voltage loop compares Vbat with the target value, generates an error signal, and adjusts the power output of the energy storage port to stabilize Vbat. The current loop controls the inductor current to follow the reference signal based on the real-time values ​​of iL1 and iL2, optimizes energy transfer efficiency, and prevents current overshoot.

[0099] The interleaved phase-shift control process corresponding to the primary side control is used to generate PWM signals for the switching transistors S1 to S4 of the primary side module 2, where S1 and S2, and S3 and S4, respectively use complementary drive signals. The first and second bridge arms adopt an interleaved drive method with a 180-degree phase difference, so that inductors L1 and L2 alternately excite and demagnetize, reducing the ripple of the total current ibat at the energy storage port 21 and improving system efficiency.

[0100] Secondary-side control can stabilize the load port voltage Vo and achieve rapid response and independent adjustment to load changes. In the phase-shift control process, the voltage phase shift angle Dφ between the midpoint voltage vab of the primary-side module bridge arm and the midpoint voltage vcd of the secondary-side module bridge arm is adjusted to control the direction and magnitude of power transmission.

[0101] Based on the voltage phase shift angle Dφ, the generated PWM signals of the secondary-side switching transistors S5 to S6 can drive the half-bridge structure to stabilize Vo.

[0102] In continuous conduction mode (CCM), the control method of this scheme achieves zero-voltage conduction and efficient energy transfer through three switching modes.

[0103] In mode 1, control switches S1 and S4 are turned on, inductor L1 is connected to DC voltage Vin through S1 and S4 for excitation, inductor L2 is demagnetized, and secondary module 3 supplies power to the load through S5 and diode D2.

[0104] In mode 2, control S5 is turned off, and the current is commutated to diode D1 and the body diode of S6, achieving zero-voltage conduction of S6. The secondary-side module supplies power to the load port through S6 and D1, while the energy storage state of the primary-side module remains unchanged.

[0105] In mode 3, control switches S1 and S4 are turned off, while S2 and S3 are turned on. This allows inductor L2 to be connected to Vin via S2 and S3 for excitation, while inductor L1 is demagnetized. Secondary module 3 is powered through S6 and D1, achieving zero-voltage turn-on.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated grid-connected multi-port converter, characterized in that: include, The grid input module (1) receives the grid voltage, which enters the rectifier unit (11) and is converted into DC voltage. The primary side module (2) is equipped with a full-bridge structure and an interleaved bidirectional structure, receives DC voltage and connects to the energy storage port (21) to realize energy storage and release; The secondary side module (3) includes a half-bridge structure and is connected to the load port (31) to achieve efficient energy transmission.

2. The integrated grid-connected multi-port converter according to claim 1, characterized in that: The primary side module (2) includes inductors L1 and L2, and switching transistors S1 to S4; S1 and S2 form the first bridge arm. The drain of S1 is connected to the positive terminal of the DC voltage Vin, and the source of S2 is connected to the negative terminal of Vin. S3 and S4 form the second bridge arm. The drain of S3 is connected to the positive terminal of Vin, and the source of S4 is connected to the negative terminal of Vin. One end of inductor L1 is connected to the common node of S1 and S2, and the other end is connected to the energy storage port (21); one end of inductor L2 is connected to the common node of S3 and S4, and the other end is connected to the energy storage port (21). S1 and S2, and S3 and S4, use complementary driving signals respectively.

3. The integrated grid-connected multi-port converter according to claim 1, characterized in that: The primary side module (2) uses an interleaved drive method with a phase shift angle of 180 degrees to control S1 to S4; The first and second bridge arms, composed of S1 and S2, and S3 and S4, have a phase difference of 180 degrees in their drive signals. Inductors L1 and L2 are alternately energized and demagnetized to reduce the total current ripple at the energy storage port (21).

4. The integrated grid-connected multi-port converter according to claim 1, characterized in that: The secondary side module (3) includes switching transistors S5 to S6 and diodes D1 to D2; The drain of S5 and the source of S6 are respectively connected to the other end of the secondary winding of the transformer, and the source of S5 is connected to the drain of S6. The cathode of diode D1 is connected to the drain of S5, and the anode is connected to the negative terminal of the load port (31). The cathode of diode D2 is connected to the source of S6, and the anode is connected to the negative terminal of the load port (31). The positive terminal of the load port (31) is connected to the midpoint of the secondary winding of the transformer, and is used to supply power to the load by reflecting energy through the transformer.

5. The integrated grid-connected multi-port converter according to claim 1, characterized in that: A filter module (4) is installed in both the primary side module (2) and the secondary side module (3); The filtering module (4) includes an input filtering capacitor (41), an energy storage port filtering capacitor (42), and a load port filtering capacitor (43); The input filter capacitor (41) is connected in parallel across the DC voltage Vin to stabilize the DC voltage output; The energy storage port filter capacitor (42) is connected in parallel across the two ends of the energy storage port (21) to smooth the voltage corresponding to the energy storage port (21); The load port filter capacitor (43) is connected in parallel across the two ends of the load port (31) to stabilize the voltage of the load port (31); The AC side filter inductor Lf is connected in series between the power grid input module (1) and the rectifier unit (11).

6. A transformation control method, characterized in that, include: The phase of the grid voltage is obtained by phase-locked loop, and the switching signal of the rectifier circuit is generated by dual closed-loop control to achieve DC voltage stabilization. The switching signal of the primary side module (2) is generated by using dual closed-loop control and staggered phase shift control to achieve stable energy storage port voltage and reduced current ripple; Phase-shift control is used to generate the switching signal of the secondary side module (3) to achieve load port voltage stability.

7. The transformation control method according to claim 6, characterized in that: In the primary control process, Actual control operations are performed based on the energy storage voltage Vbat and the inductor currents iL1 and iL2. The outer loop voltage control compares Vbat with the target value to generate an error signal, while the inner loop current control adjusts iL1 and iL2 to optimize energy transfer.

8. The transformation control method according to claim 7, characterized in that: In the staggered phase shift control process, The interleaved phase shift control is a 180-degree phase shift, used to generate the PWM signals corresponding to S1 to S4 of the primary side module (2); Inductors L1 and L2 work alternately to reduce the ripple of the total current ibat at the energy storage port (21) and improve system efficiency.

9. The transformation control method according to claim 8, characterized in that: In the phase shift control process, The phase shift control adjusts the voltage phase shift angle between the primary side module (2) and the secondary side module (3) to generate PWM signals for the secondary side switching transistors S5 to S6; The corresponding PWM signal enables independent adjustment of the load voltage Vo, ensuring the stability of the drive signal corresponding to the primary side module (2).

10. The transformation control method according to any one of claims 7 to 9, characterized in that: In continuous conduction mode, there are three corresponding switching modes; In mode 1, control switches S1 and S4 are turned on, inductor L1 is connected to DC voltage Vin through S1 and S4 for excitation, inductor L2 is demagnetized, and secondary module (3) supplies power to the load through S5 and diode D2. In mode 2, the control switch S5 is turned off and S6 is turned on with zero voltage. The secondary side module (3) is powered through S6 and diode D1. In mode 3, control switches S1 and S4 are turned off, and S2 and S3 are turned on, so that inductor L2 is connected to Vin through S2 and S3 for excitation, inductor L1 is demagnetized, and the secondary side module (3) is powered through S6 and D1 to achieve zero voltage conduction.

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