Reconfigurable dual-output resonant DC-DC converter

Abstract

The utility model belongs to the technical field of power electronics, and discloses a reconfigurable dual-output resonant DC-DC converter, which is characterized in that an emitter of a first switching tube S1 and a collector of a second switching tube S2 are connected with a first end of a resonant capacitor Cr; the collector electrode of the fourth switch tube S4 is connected with the emitter electrode of the third switch tube S3; the second end of the resonant capacitor Cr is connected with the first end of the switching tube Sa and the first end of the leakage inductor Lr; the second end of the switching tube Sa is connected with the first end of the capacitor Cp, and the second end of the capacitor Cp is connected with the second end of the leakage inductor Lr, the first end of the excitation inductor Lm and the dotted terminal of the primary winding of the transformer T1; the secondary side of the transformer T1 comprises a secondary side first port and a secondary side second port which have the same structure, the secondary side first port comprises a secondary pole first winding, and the secondary side second port comprises a secondary pole second winding. According to the utility model, through a dynamic topology switching mechanism, the problem that the frequency regulation range of a traditional LLC converter is too wide can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to a reconfigurable dual-output resonant DC-DC converter. Background Technology

[0002] Multiport DC-DC converters, with their compact structure and low cost, have become an important choice for integrated power supply solutions in electric vehicles, drones, and distributed energy systems. However, due to the wide voltage fluctuation characteristics of renewable energy input sources, these systems require voltage gain ranges far exceeding those of traditional DC-DC converters. Conventional topologies are limited by switching losses and magnetic component saturation, often making it difficult to meet the dynamic requirements of multiport systems.

[0003] Resonant converters offer a new approach to addressing this challenge, with their zero-voltage switching (ZVS) characteristics significantly reducing switching losses at high frequencies, making them particularly suitable for wide-voltage applications. However, multi-port architectures using LLC resonant networks face new challenges: to achieve a wide-range voltage gain, the system needs to adjust the operating frequency over a large frequency range, which complicates the design of magnetic components. Furthermore, the soft-switching characteristics are susceptible to frequency shifts under light loads. Therefore, hybrid modulation strategies or novel topology optimizations are needed to overcome the current technological bottlenecks.

[0004] Chinese patent publication number CN109245545A, entitled "A High Voltage Gain LCL Resonant DC-DC Converter," includes a DC power supply Uin, a flyback transformer TX1 and a main transformer TX2, a primary circuit connected to the primary windings of the two transformers, a diode D5 connected to the secondary winding of the flyback transformer, a rectifier circuit connected to the secondary winding of the main transformer, an output capacitor Co, and a load resistor Ro. The primary circuit connected to the primary windings of the flyback and main transformers includes four power switching transistors and their four anti-parallel diodes, a resonant capacitor Cr, and a resonant inductor Lk. This patent application fails to address the problem of an excessively wide frequency adjustment range for the converter. Utility Model Content

[0005] To overcome the problems existing in the prior art, the purpose of this invention is to provide a reconfigurable dual-output resonant DC-DC converter that organically integrates LLC and LLC-C resonant networks. Through a dynamic topology switching mechanism, the system operates in LLC mode under high-gain conditions and automatically switches to LLC-C mode under low-gain conditions, effectively solving the problem of excessively wide frequency adjustment range in traditional LLC converters.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A reconfigurable dual-output resonant DC-DC converter includes switching transistors Sa, a first switching transistor S1, a second switching transistor S2, a third switching transistor S3, a fourth switching transistor S4, a resonant capacitor Cr, a capacitor Cp, a leakage inductance Lr, a magnetizing inductance Lm, and a transformer T1. The positive terminal of a power supply Vin is connected to the collectors of the first switching transistor S1 and the third switching transistor S3; the negative terminal of the power supply Vin is connected to the emitters of the second switching transistor S2 and the fourth switching transistor S4; the emitters of the first switching transistor S1 and the collectors of the second switching transistor S2 are both connected to the first terminal of the resonant capacitor Cr; the collector of the fourth switching transistor S4 is connected to the emitter of the third switching transistor S3, the second terminal of the magnetizing inductance Lm, and the opposite terminal of the primary winding of the transformer T1; the second terminal of the resonant capacitor Cr is connected to the first terminal of the switching transistor Sa and the first terminal of the leakage inductance Lr; the second terminal of the switching transistor Sa is connected to the first terminal of the capacitor Cp, and the second terminal of the capacitor Cp is connected to the second terminal of the leakage inductance Lr and the magnetizing inductance Lm. The first terminal of inductor Lm is the same as the primary winding terminal of transformer T1. The secondary side of transformer T1 includes a first secondary terminal and a second secondary terminal with identical structures. The first secondary terminal includes a first secondary winding, and the second secondary terminal includes a second secondary winding. The first secondary terminal includes: a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, a first capacitor C1, and a first resistor R1. The same-named terminal of the first secondary winding of transformer T1 is connected to the emitter of the fifth switch S5 and the collector of the sixth switch S6. The opposite-named terminal of the first secondary winding of transformer T1 is connected to the emitter of the seventh switch S7 and the collector of the eighth switch S8. The collectors of the fifth switch S5 and the seventh switch S7 are both connected to the first terminal of the first capacitor C1 and the first terminal of the first resistor R1. The emitters of the sixth switch S6 and the eighth switch S8 are both connected to the second terminal of the first capacitor C1 and the second terminal of the first resistor R1.

[0008] Optionally, the emitter of the first switch S1 is connected to the collector of the second switch S2.

[0009] Optionally, the emitter of the fourth switch S4 is connected to the emitter of the second switch S2; the collector of the fourth switch S4 is connected to the emitter of the third switch S3.

[0010] Optionally, the collector of the fifth switch S5 is connected to the collector of the seventh switch S7; and the emitter of the sixth switch S6 is connected to the emitter of the eighth switch S8.

[0011] Optionally, the second terminal of the first capacitor C1 is connected to the second terminal of the first resistor R1; the first terminal of the first capacitor C1 is connected to the first terminal of the first resistor R1.

[0012] Optionally, the first end of the excitation inductor Lm is connected to the same-name terminal of the primary winding of transformer T1, and the second end is connected to the opposite-name terminal of the primary winding of transformer T1.

[0013] Optionally, the same-named terminal of the second secondary winding of transformer T1 is connected to the emitter of the ninth switch S9 and the collector of the tenth switch S10; the opposite-named terminal of the second secondary winding of transformer T1 is connected to the emitter of the eleventh switch S11 and the collector of the twelfth switch S12; the collector of the ninth switch S9 is connected to the collector of the eleventh switch S11, the first terminal of the second capacitor C2, and the first terminal of the second resistor R2; the first terminal of the second capacitor C2 is connected to the first terminal of the second resistor R2; the emitter of the tenth switch S10 is connected to the emitter of the twelfth switch S12, the second terminal of the second capacitor C2, and the second terminal of the second resistor R2; the second terminal of the second capacitor C2 is connected to the second terminal of the second resistor R2.

[0014] Optionally, the switching transistor Sa includes an internal first switching transistor Sa1 and an internal second switching transistor Sa2, the emitter of the internal first switching transistor Sa1 is connected to the collector of the internal second switching transistor Sa2, and the emitter of the internal second switching transistor Sa2 is connected to the capacitor Cp.

[0015] Optionally, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all insulated gate bipolar transistors, field-effect transistors, or silicon carbide field-effect transistors.

[0016] Optionally, both capacitor Cp and the first capacitor C1 are electrolytic capacitors.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention discloses a reconfigurable dual-output resonant DC-DC converter that employs topology reconfiguration technology to organically integrate two resonant networks: LLC (Inductor-Inductor-Capacitor Resonant Converter) and LLC-C (LLC with Capacitive Optimization). Through a dynamic topology switching mechanism, the system operates in LLC mode under high-gain conditions and automatically switches to LLC-C mode under low-gain conditions. This innovative design achieves stable maintenance of zero-voltage switching (ZVS) across the entire operating range, significantly improving power conversion efficiency. This wide input and narrow-band modulation characteristic effectively solves the problem of excessively wide frequency adjustment range in traditional LLC converters, making it particularly suitable for applications requiring wide voltage adaptability, such as photovoltaic energy storage. Attached Figure Description

[0019] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0020] Figure 1 This is a topology diagram of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0021] Figure 2 This is a schematic diagram of the first operating state of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0022] Figure 3 This is a schematic diagram of the second operating state of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0023] Figure 4 This is a supplement to the schematic diagram of the second operating state of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0024] Figure 5 This is a schematic diagram of the third operating state of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0025] Figure 6 This is a schematic diagram of the fourth operating state of the reconfigurable dual-output resonant DC-DC converter of this utility model.

[0026] Figure 7 This is a diagram showing the internal structure of the switching transistor Sa in the reconfigurable dual-output resonant DC-DC converter of this invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model.

[0030] When an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. The use of the term "horizontal" does not imply that the component is required to be absolutely horizontal, but rather that it may be slightly tilted. "Horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] This utility model discloses a reconfigurable dual-output resonant DC-DC converter, comprising a switching transistor Sa, a first switching transistor S1, a second switching transistor S2, a third switching transistor S3, a fourth switching transistor S4, a resonant capacitor Cr, a capacitor Cp, a leakage inductance Lr, a magnetizing inductance Lm, and a transformer T1. The positive terminal of the power supply Vin is connected to the collectors of the first switching transistor S1 and the third switching transistor S3; the negative terminal of the power supply Vin is connected to the emitters of the second switching transistor S2 and the fourth switching transistor S4; the emitters of the first switching transistor S1 and the collectors of the second switching transistor S2 are both connected to the first terminal of the resonant capacitor Cr; the collector of the fourth switching transistor S4 is connected to the emitter of the third switching transistor S3, the second terminal of the magnetizing inductance Lm, and the opposite terminal of the primary winding of the transformer T1; the second terminal of the resonant capacitor Cr is connected to the first terminal of the switching transistor Sa and the first terminal of the leakage inductance Lr; the second terminal of the switching transistor Sa is connected to the first terminal of the capacitor Cp, and the second terminal of the capacitor Cp is connected to the second terminal of the leakage inductance Lr. The first terminal of the magnetizing inductor Lm is connected to the same terminal of the primary winding of transformer T1. The secondary side of transformer T1 includes a first secondary terminal and a second secondary terminal with identical structures. The first secondary terminal includes a first secondary winding, and the second secondary terminal includes a second secondary winding. The first secondary terminal includes: a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, a first capacitor C1, and a first resistor R1. The same terminal of the first secondary winding of transformer T1 is connected to the emitter of the fifth switch S5 and the collector of the sixth switch S6. The opposite terminal of the first secondary winding of transformer T1 is connected to the emitter of the seventh switch S7 and the collector of the eighth switch S8. The collectors of the fifth switch S5 and the seventh switch S7 are both connected to the first terminal of the first capacitor C1 and the first terminal of the first resistor R1. The emitters of the sixth switch S6 and the eighth switch S8 are both connected to the second terminal of the first capacitor C1 and the second terminal of the first resistor R1.

[0035] This invention discloses a reconfigurable dual-output resonant DC-DC converter that organically integrates LLC and LLC-C resonant networks using topology reconfiguration technology. Through a dynamic topology switching mechanism, the system operates in LLC mode under high-gain conditions and automatically switches to LLC-C mode under low-gain conditions. This innovative design achieves stable maintenance of zero-voltage switching (ZVS) across the entire operating range, significantly improving power conversion efficiency. This wide input and narrow-band modulation characteristic effectively solves the problem of excessively wide frequency adjustment range in traditional LLC converters, making it particularly suitable for applications requiring wide voltage adaptability, such as photovoltaic energy storage.

[0036] Example 1

[0037] In this embodiment, a reconfigurable dual-output resonant DC-DC converter includes a switch Sa, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a resonant capacitor Cr, a leakage inductance Lr, a magnetizing inductance Lm, a capacitor Cp, and a transformer T1.

[0038] The positive terminal of power supply Vin is connected to the collector of the first switching transistor S1 and the collector of the third switching transistor S3; the negative terminal of power supply Vin is connected to the emitter of the second switching transistor S2 and the emitter of the fourth switching transistor S4.

[0039] The emitter of the first switch S1 is connected to the first terminal of the resonant capacitor Cr and the collector of the second switch S2. The collector of the second switch S2 is connected to the first terminal of the resonant capacitor Cr.

[0040] The emitter of the fourth switch S4 is connected to the emitter of the second switch S2.

[0041] The collector of the fourth switch S4 is connected to the emitter of the third switch S3, the second terminal of the magnetizing inductor Lm, and the opposite terminal of the primary winding of the transformer T1.

[0042] The second terminal of the resonant capacitor Cr is connected to the first terminal of the switching transistor Sa and the first terminal of the leakage inductance Lr.

[0043] The second terminal of the switching transistor Sa is connected to the first terminal of the capacitor Cp, and the second terminal of the capacitor Cp is connected to the second terminal of the leakage inductance Lr, the first terminal of the magnetizing inductance Lm, and the same terminal of the primary winding of the transformer T1.

[0044] The first end of the magnetizing inductor Lm is connected to the same-name terminal of the primary winding of transformer T1, and the second end is connected to the opposite-name terminal of the primary winding of transformer T1.

[0045] The secondary side of the transformer T1 includes a first secondary side port and a second secondary side port with identical structures. The first secondary side port includes a first secondary winding, and the second secondary side port includes a second secondary winding.

[0046] The second-side first port includes: a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, a first capacitor C1, and a first resistor R1.

[0047] The same-name terminal of the first secondary winding of transformer T1 is connected to the emitter of the fifth switch S5 and the collector of the sixth switch S6.

[0048] The opposite-named terminal of the first secondary winding of transformer T1 is connected to the collector of the seventh switch S7 and the collector of the eighth switch S8.

[0049] The collector of the fifth switch S5 is connected to the collector of the seventh switch S7, the first terminal of the first capacitor C1, and the first terminal of the first resistor R1.

[0050] The emitter of the fifth switch S5 is connected to the collector of the sixth switch S6.

[0051] The emitter of the seventh switch S7 is connected to the collector of the eighth switch S8.

[0052] The collector of the seventh switch S7 is connected to the first terminal of the first capacitor C1 and the first terminal of the first resistor R1.

[0053] The first terminal of the first capacitor C1 is connected to the first terminal of the first resistor R1; the emitter of the sixth switch S6 is connected to the emitter of the eighth switch S8, the second terminal of the first capacitor C1, and the second terminal of the first resistor R1.

[0054] The emitter of the eighth switch S8 is connected to the second terminal of the first capacitor C1 and the second terminal of the first resistor R1;

[0055] The second terminal of the first capacitor C1 is connected to the second terminal of the first resistor R1;

[0056] The second port of the secondary side includes: a ninth switch S9, a tenth switch S10, an eleventh switch S11, a twelfth switch S12, a second capacitor C2, and a second resistor R2.

[0057] The same-named terminal of the second secondary winding of transformer T1 is connected to the emitter of the ninth switch S9 and the collector of the tenth switch S10; the opposite-named terminal of the second secondary winding of transformer T1 is connected to the emitter of the eleventh switch S11 and the collector of the twelfth switch S12.

[0058] The emitter of the ninth switch S9 is connected to the collector of the tenth switch S10.

[0059] The emitter of the eleventh switch S11 is connected to the collector of the twelfth switch S12.

[0060] The collector of the ninth switch S9 is connected to the collector of the eleventh switch S11, the first terminal of the second capacitor C2, and the first terminal of the second resistor R2.

[0061] The first terminal of the second capacitor C2 is connected to the first terminal of the second resistor R2; the emitter of the tenth switch S10 is connected to the emitter of the twelfth switch S12, the second terminal of the second capacitor C2, and the second terminal of the second resistor R2.

[0062] The emitter of the twelfth switch S12 is connected to the second terminal of the second capacitor C2 and the second terminal of the second resistor R2; the second terminal of the second capacitor C2 is connected to the second terminal of the second resistor R2.

[0063] The output voltages of the first resistor R1 and the second resistor R2 are collected as Vout1 and Vout2, and the output currents are collected as Iout1 and Iout2.

[0064] Optionally, the switching transistor S is an insulated gate bipolar transistor, a field-effect transistor, or a silicon carbide field-effect transistor.

[0065] Optionally, the capacitor Cp, the first capacitor C1, and C2 are all electrolytic capacitors.

[0066] Specifically, the transformer includes a primary winding, a first secondary terminal, and a second secondary terminal.

[0067] The second-side first port includes a secondary first winding, and the second-side second port includes a secondary second winding.

[0068] Optionally, the turns ratio of the primary winding, the first secondary winding, and the second secondary winding of the transformer is N:1:1.

[0069] Preferably, both capacitors C1 and C2 are aluminum electrolytic capacitors; specifically, the anode of the aluminum electrolytic capacitor is aluminum foil, the anode is coated with electrolyte, and the cathode of the electrolytic capacitor is composed of conductive material and electrolyte.

[0070] Preferably, both the capacitor Cp and the resonant Cr are polypropylene CBB capacitors; specifically, the polypropylene CBB capacitor has extremely low equivalent series resistance and equivalent series inductance. It is suitable for high-frequency resonant applications, has a wide rated voltage range, stable temperature coefficient, and high long-term reliability.

[0071] Preferably, the transformer T1 uses manganese-zinc ferrite; specifically, the transformer T1 has low core loss at high frequencies and high permeability, thus achieving the requirements of lightweight and high density. The saturation magnetic flux density of manganese-zinc ferrite is approximately 0.4-0.5T. By optimizing the air gap, the core's anti-saturation capability and leakage inductance control can be balanced, and it exhibits excellent temperature stability.

[0072] Preferably, the input voltage of the input source Vs is 250-450V, and the output voltage is 400V.

[0073] The resonant capacitor Cr, inductor Lr, switch Sa, capacitor Cp, and magnetizing inductor Lm constitute the resonant cavity. By setting the inductor and capacitor parameters and controlling the operating state of the switch S, five different operating conditions and the switching between these conditions can be achieved.

[0074] The reconfigurable dual-output resonant DC-DC converter proposed in this invention integrates two types of resonant networks, LLC and LLC-C, for use in high-gain and low-gain scenarios respectively, achieving wide voltage gain coverage.

[0075] The reconfigurable dual-output resonant DC-DC converter proposed in this invention can achieve zero-voltage turn-on and zero-current turn-off within the operating frequency range. In LLC mode, the resonant current lags behind the switching voltage to ensure ZVS conduction; in LLC-C mode, a parallel capacitor adjusts the input impedance characteristics to maintain ZVS operation.

[0076] This invention proposes a reconfigurable dual-output resonant DC-DC converter, employing a multi-port design with a shared high-frequency transformer T1, combined with independent secondary full-bridge rectification. The dual 400V outputs achieve voltage regulation through independent control of the switching frequency, reducing the number of components and size compared to multiple independent converters.

[0077] The reconfigurable dual-output resonant DC-DC converter proposed in this invention significantly increases the impedance change rate by using parallel capacitor Cp in LLC-C mode. In the low-gain range, only a small frequency adjustment is needed to achieve a large gain change, increasing the narrow frequency adjustment range and reducing EMI and magnetic component design difficulty.

[0078] The reconfigurable dual-output resonant DC-DC converter proposed in this invention can be applied to a wide range of output voltage conditions. Switching between LL and LLC-C modes requires only control of the auxiliary switch Sa, without any additional hardware modifications. Mode switching is achieved smoothly through zero-current detection (ZCD), avoiding hard switching events and voltage spikes, thus improving system reliability.

[0079] Example 2

[0080] In this embodiment, the switching transistors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, and S12 are all IGBTs of model IRG4BC40W. The IGBTs of model IRG4BC40W have a withstand voltage of 600V and can perform well in medium-voltage applications. The maximum continuous collector current Ic is 23A, capable of withstanding large currents. The power consumption (Pd) is 100W, the operating temperature range is from -55℃ to +155℃, the maximum gate-emitter voltage is 20V, the collector-emitter saturation voltage is 2.1V, and the gate-emitter leakage current is 100nA.

[0081] Example 3

[0082] like Figure 1 As shown, the reconfigurable dual-output resonant DC-DC converter in this embodiment includes the following operating modes:

[0083] The first operating mode: the polarity of the excitation current iLm is positive. During this stage, the first switch S1 and the third switch S3, as well as the fifth switch S5, the eighth switch S8, the ninth switch S9, and the twelfth switch S12 on the secondary side and windings, remain in a conducting state. Energy is transferred from the input power supply to the load through the resonant network, completing the power transfer to the output.

[0084] The second operating mode: At the end of the first stage, the drive signals for the first switch S1 and the third switch S3 are removed. At this time, the excitation current iLm gradually decays from its peak value. Due to the charging effect of the parasitic capacitances C1 and C3 of the first switch S1 and the third switch S3, the voltage difference between the first switch S1 and the third switch S3 gradually rises to Vin, thereby achieving soft switching turn-off of the first switch S1 and the third switch S3. During this process, energy is transferred from the power supply end to the load end through the switches S5, S8, S9, and S12 of the secondary side and the third winding, maintaining the continuity of power flow.

[0085] The third operating mode: The voltage difference between the second switch S2 and the fourth switch S4 drops to zero. At this time, a drive pulse is applied to the second switch S2 and the fourth switch S4, and the polarity of the primary current iLr is reversed. The sixth switch S6, the seventh switch S7, the tenth switch S10, and the eleventh switch S11 on the secondary side are turned on with zero current. At the end of this stage, the polarity of the voltage of the transformer T1 winding changes from positive to negative, and the energy transmission path switches to the sixth switch S6, the seventh switch S7, the tenth switch S10, and the eleventh switch S11, completing the smooth transition of the circuit's operating mode.

[0086] The fourth operating mode: The excitation current iLm drops to zero, and the primary current iLr begins to decay from zero to the negative direction. During this stage, the sixth switch S6, the seventh switch S7, the ninth switch S9, the tenth switch S10, and the eleventh switch S11 on the secondary side and the third winding remain in the conducting state, and energy is continuously transferred from the power supply to the load through the resonant network. With the dynamic change of the voltage polarity of the transformer T1 winding, the negative growth of the primary current creates conditions for zero-current soft switching in the next cycle, ensuring seamless transition of the mode switching process of the full-bridge topology.

[0087] Subsequently, the converter operates symmetrically to the first through fourth operating modes.

[0088] This invention relates to a reconfigurable dual-output resonant DC-DC converter. The input current of the topology is continuous, exhibiting low ripple. This invention innovatively employs topology deformation technology, deeply integrating LLC and LLC-C resonant networks. It achieves dual-mode operation through dynamic reconfiguration of the resonant network structure: operating in a standard LLC resonant architecture under high-gain conditions to fully utilize its high-voltage transmission characteristics; and seamlessly switching to an LLC-C resonant network configuration under low-gain conditions, utilizing the tuning effect of additional capacitors to optimize energy transmission efficiency. This intelligent topology adaptive mechanism significantly widens the system's gain adjustment range and achieves optimal efficiency across the entire operating range under different load conditions, demonstrating excellent dynamic response and energy efficiency balance characteristics.

[0089] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A reconfigurable dual-output resonant DC-DC converter, characterized in that, The system includes a switching transistor Sa, a first switching transistor S1, a second switching transistor S2, a third switching transistor S3, a fourth switching transistor S4, a resonant capacitor Cr, a capacitor Cp, a leakage inductance Lr, a magnetizing inductance Lm, and a transformer T1. The positive terminal of the power supply Vin is connected to the collectors of the first switching transistor S1 and the third switching transistor S3; the negative terminal of the power supply Vin is connected to the emitters of the second switching transistor S2 and the fourth switching transistor S4; the emitters of the first switching transistor S1 and the collectors of the second switching transistor S2 are both connected to the first terminal of the resonant capacitor Cr; the collector of the fourth switching transistor S4 is connected to the emitter of the third switching transistor S3, the second terminal of the magnetizing inductance Lm, and the opposite-name terminal of the primary winding of the transformer T1; the second terminal of the resonant capacitor Cr is connected to the first terminal of the switching transistor Sa and the first terminal of the leakage inductance Lr; the second terminal of the switching transistor Sa is connected to the first terminal of the capacitor Cp, and the second terminal of the capacitor Cp is connected to the second terminal of the leakage inductance Lr, the first terminal of the magnetizing inductance Lm, and the transformer T1. The primary winding of transformer T1 has the same name terminal; the secondary side of transformer T1 includes a secondary first port and a secondary second port with the same structure. The secondary first port includes a secondary first winding, and the secondary second port includes a secondary second winding. The secondary first port includes: a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, a first capacitor C1, and a first resistor R1. The same name terminal of the secondary first winding of transformer T1 is connected to the emitter of the fifth switch S5 and the collector of the sixth switch S6. The opposite name terminal of the secondary first winding of transformer T1 is connected to the emitter of the seventh switch S7 and the collector of the eighth switch S8. The collectors of the fifth switch S5 and the seventh switch S7 are both connected to the first terminal of the first capacitor C1 and the first terminal of the first resistor R1. The emitters of the sixth switch S6 and the eighth switch S8 are both connected to the second terminal of the first capacitor C1 and the second terminal of the first resistor R1.

2. The reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The emitter of the first switch S1 is connected to the collector of the second switch S2.

3. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The emitter of the fourth switch S4 is connected to the emitter of the second switch S2; the collector of the fourth switch S4 is connected to the emitter of the third switch S3.

4. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The collector of the fifth switch S5 is connected to the collector of the seventh switch S7; the emitter of the sixth switch S6 is connected to the emitter of the eighth switch S8.

5. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The second end of the first capacitor C1 is connected to the second end of the first resistor R1; the first end of the first capacitor C1 is connected to the first end of the first resistor R1.

6. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The first end of the excitation inductor Lm is connected to the same-name terminal of the primary winding of transformer T1, and the second end is connected to the opposite-name terminal of the primary winding of transformer T1.

7. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The same-named terminal of the second secondary winding of transformer T1 is connected to the emitter of the ninth switch S9 and the collector of the tenth switch S10; the opposite-named terminal of the second secondary winding of transformer T1 is connected to the collector of the eleventh switch S11 and the collector of the twelfth switch S12; the collector of the ninth switch S9 is connected to the emitter of the eleventh switch S11, the first terminal of the second capacitor C2, and the first terminal of the second resistor R2; the collector of the eleventh switch S11 is connected to the first terminal of the second capacitor C2 and the first terminal of the second resistor R2; the first terminal of the second capacitor C2 is connected to the first terminal of the second resistor R2; the emitter of the tenth switch S10 is connected to the emitter of the twelfth switch S12, the second terminal of the second capacitor C2, and the second terminal of the second resistor R2; the emitter of the twelfth switch S12 is connected to the second terminal of the second capacitor C2 and the second terminal of the second resistor R2; the second terminal of the second capacitor C2 and the second terminal of the second resistor R2 are connected together.

8. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The switching transistor Sa includes an internal first switching transistor Sa1 and an internal second switching transistor Sa2. The emitter of the internal first switching transistor Sa1 is connected to the collector of the internal second switching transistor Sa2, and the emitter of the internal second switching transistor Sa2 is connected to the capacitor Cp.

9. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, The first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all insulated gate bipolar transistors, field-effect transistors, or silicon carbide field-effect transistors.

10. A reconfigurable dual-output resonant DC-DC converter according to claim 1, characterized in that, Both capacitor Cp and the first capacitor C1 are electrolytic capacitors.

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