Isolated high-gain resonant and non-resonant soft switching hybrid conversion circuit

Abstract

The invention discloses an isolated high-gain resonant and non-resonant soft switching hybrid conversion circuit, which comprises a low-voltage side module consisting of a low-voltage power supply, two inductors and two switching tubes; the soft switching module consists of an inductor, two capacitors and two switching tubes; the isolation module is composed of a transformer; the high-voltage side module is composed of two capacitors, two diodes and a resistor. The hybrid conversion circuit of the isolated high-gain resonant soft switch and the isolated high-gain resonant soft switch have the advantages of the resonant soft switch and the advantages of the non-resonant soft switch, namely, the hybrid conversion circuit has the advantages of excellent efficiency in a full load range and a wide voltage range, remarkable improvement of switching frequency and power density, good electromagnetic interference characteristic and high adaptability to element parameter change; the method is very suitable for high-end power electronic application occasions of new energy automobiles, data centers, renewable energy sources and the like which are wide in input and output range and have strict requirements on efficiency and power density.

Description

A hybrid converter circuit combining isolated high-gain resonant and non-resonant soft switching. Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a hybrid conversion circuit of isolated high-gain resonant and non-resonant soft switching. Background Technology

[0002] With the increasing demands for efficiency, power density, and reliability of power electronic converters from high-end applications such as new energy vehicles, data centers, and renewable energy, bidirectional DC-DC converters that combine high gain and electrical isolation have become a key technology. In traditional solutions, resonant soft-switching converters (such as LLC) can achieve excellent soft-switching characteristics and low electromagnetic interference, but their voltage gain range is narrow and they are sensitive to load and parameter changes, making them difficult to adapt to wide-range voltage applications. Non-resonant soft-switching technologies (such as active clamping) can broaden the soft-switching range, but they often require the addition of auxiliary switches and complex control, leading to increased system costs and challenges to reliability.

[0003] To balance high efficiency and wide gain, existing technologies attempt to combine resonant and non-resonant soft switching. However, most hybrid architectures suffer from complex energy management, high transient stress, and limited soft switching range during mode switching. Furthermore, the large number of components often impacts power density and cost. In addition, the need for electrical isolation further complicates transformer design and magnetic component optimization, making it difficult to simultaneously achieve high efficiency, high gain, and high reliability in a single topology.

[0004] Therefore, there is an urgent need for a novel isolated converter circuit that can deeply integrate the advantages of resonant and non-resonant soft-switching, ensuring efficient soft-switching across the entire load range while achieving wide-range, high-gain bidirectional energy transfer, and maintaining a simple structure and reliable control. This invention addresses these needs by proposing an innovative hybrid architecture, aiming to provide a superior solution for high-performance power electronic systems. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, the purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and to propose a hybrid converter circuit that combines isolated high-gain resonant and non-resonant soft switching, thus possessing the advantages of both resonant and non-resonant soft switching.

[0007] To achieve the above objectives, the technical solution provided by the present invention is: a hybrid conversion circuit of isolated high-gain resonant and non-resonant soft switching, the conversion circuit including a low-voltage side module, a soft-switching module, an isolation module and a high-voltage side module.

[0008] The low-voltage side module includes a low-voltage power supply, a first inductor, a second inductor, a first switching transistor, and a second switching transistor. The positive terminal of the low-voltage power supply is connected to the first terminals of the first and second inductors. The second terminal of the first inductor is connected to the drain of the first switching transistor. The second terminal of the second inductor is connected to the drain of the second switching transistor. The sources of the first and second switching transistors are connected to the negative terminal of the low-voltage power supply. The soft-switching module includes an auxiliary inductor, a first capacitor, and a second capacitor. The first terminal of the first capacitor is connected to the first terminal of the auxiliary inductor and the second terminal of the first inductor, and the second terminal of the first capacitor is connected to the source of a third switching transistor. The first terminal of the auxiliary inductor is connected to the second terminal of the first inductor, and the second terminal of the auxiliary inductor is connected to the same terminal on the low-voltage side of the transformer. The first terminal of the second capacitor is connected to the other terminal on the low-voltage side of the transformer and the drain of the second switching transistor, and the second terminal of the second capacitor is connected to the source of a fourth switching transistor. The high-voltage side module includes the high-voltage side capacitor, an output capacitor, a first diode, a second diode, and a load resistor. The high-voltage side capacitor has its first terminal connected to the high-voltage side terminal of the transformer, and its second terminal connected to the second terminal of the first diode and the first terminal of the second diode. The output capacitor has its first terminal connected to the second terminal of the second diode and the first terminal of the load resistor, and its second terminal connected to the other high-voltage side terminal of the transformer, the first terminal of the first diode, the second terminal of the output capacitor, and the second terminal of the load resistor. The isolation module consists of a transformer, with its low-voltage side terminal connected to the second terminal of the auxiliary inductor, its other low-voltage side terminal connected to the first terminal of the second capacitor, its high-voltage side terminal connected to the first terminal of the high-voltage side capacitor, and its other high-voltage side terminal connected to the first terminal of the first diode.

[0009] The conversion circuit includes a first to a tenth operating mode, which are executed sequentially as follows: First operating mode: The first switch is turned off, and the second, third, and fourth switches are all turned on; the low-voltage power supply charges the second inductor; the first inductor and the low-voltage power supply charge the first capacitor together; the energy stored in the auxiliary inductor is transferred to the first capacitor and the high-voltage side of the transformer; the current of the auxiliary inductor decreases linearly, which causes the current of the third switch to decrease linearly, realizing the non-resonant zero-voltage soft switching conduction; the current of the second diode increases linearly, realizing the non-resonant zero-current soft switching conduction.

[0010] The formula is as follows: In the formula, t is the working time, and v is the working time. L u1 is the voltage of the low-voltage power supply, u2 is the voltage of the low-voltage side of the transformer (T1), and u3 is the voltage of the high-voltage side of the transformer. C1 It is the voltage of the first capacitor, u Cd It is the voltage of the high-voltage side capacitor, u CoL1 is the voltage across the output capacitor, L2 is the inductance of the first inductor, and L3 is the inductance of the second inductor. k It is the inductance value of the auxiliary inductor, i L1 It is the current of the first inductor, i L2 It is the current of the second inductor, i Lk It is the current of the auxiliary inductor.

[0011] Second operating mode: The switching state is the same as the first operating mode, except that the current direction of the auxiliary inductor changes; the low-voltage power supply charges the second inductor; the first inductor and the low-voltage power supply charge the first capacitor and the auxiliary inductor together; the energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer; the current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the second switch, a linear decrease in the current of the third switch, and a linear increase in the current of the second diode.

[0012] The formula is as follows: The third operating mode is the same as the second operating mode, except that the current direction of the third switch changes; the low-voltage power supply charges the second inductor; the energy stored in the first inductor, the low-voltage power supply, and the first capacitor is transferred to the auxiliary inductor and the high-voltage side of the transformer; the current of the auxiliary inductor increases linearly, the current of the second switch increases linearly, the current of the third switch increases linearly, and the current of the second diode increases linearly.

[0013] The formula is the same as that for the second working mode.

[0014] Fourth operating mode: The first and third switches are both off, while the second and fourth switches are both on; the low-voltage power supply charges the second inductor; the parasitic capacitance of the first inductor, the low-voltage power supply, and the first switch resonates; the energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer; the current of the auxiliary inductor decreases nonlinearly, which leads to a nonlinear decrease in the current of the second switch and a nonlinear decrease in the current of the second diode, thus achieving resonant zero-current soft-switching turn-off.

[0015] The formula is as follows: In the formula, u Coss1 It is the capacitance value of the parasitic capacitance of the first switching transistor.

[0016] Fifth operating mode: The first, second, and fourth switches are all turned on, and the third switch is turned off first and then turned on; the low-voltage power supply charges the first and second inductors simultaneously; the auxiliary inductor is short-circuited; the auxiliary inductor current remains basically unchanged, the first switch current increases linearly, realizing non-resonant zero-current soft switching, and the second switch current increases linearly.

[0017] The formula is as follows: In the formula, u RL It is the voltage across the output resistor.

[0018] Sixth operating mode: The second switch is turned off, and the first, third, and fourth switches are all turned on; the low-voltage power supply charges the first inductor; the second inductor and the low-voltage power supply charge the second capacitor together; the energy stored in the auxiliary inductor is transferred to the second capacitor and the high-voltage side of the transformer; the current of the auxiliary inductor decreases linearly, resulting in a linear increase in the current of the first switch, a linear decrease in the current of the fourth switch, and a linear increase in the current of the first diode.

[0019] The formula is as follows: The seventh operating mode is the same as the sixth operating mode, except that the current direction of the auxiliary inductor changes; the low-voltage power supply charges the first inductor; the energy stored in the second inductor and the low-voltage power supply is transferred to the second capacitor, the auxiliary inductor, and the high-voltage side of the transformer; the energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer; the current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the first switching transistor, a linear decrease in the current of the fourth switching transistor, and a linear increase in the current of the first diode.

[0020] The formula is the same as that for the sixth working mode.

[0021] Eighth operating mode: The switching state is the same as the seventh operating mode, except that the current direction of the fourth switch changes; the low-voltage power supply charges the first inductor; the energy stored in the second inductor, the low-voltage power supply, and the second capacitor is transferred to the auxiliary inductor and the high-voltage side of the transformer; the current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the first switch, a linear increase in the current of the fourth switch, and a linear increase in the current of the first diode.

[0022] The formula is the same as that for the sixth working mode.

[0023] Ninth operating mode: The first and third switches are turned on, while the second and fourth switches are turned off; the low-voltage power supply charges the first inductor; the parasitic capacitance of the second inductor, the low-voltage power supply, and the second switch resonates; the energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer; the current of the auxiliary inductor decreases nonlinearly, which leads to a nonlinear decrease in the current of the first switch and a nonlinear decrease in the current of the first diode, thus achieving resonant zero-current soft-switching turn-off.

[0024] The formula is as follows: In the formula, u Coss2 It is the capacitance value of the parasitic capacitance of the second switching transistor.

[0025] Tenth operating mode: The first, second, and third switches are all turned on, and the fourth switch is turned off first and then turned on; the low-voltage power supply charges the first and second inductors simultaneously; the auxiliary inductor is short-circuited; the auxiliary inductor current remains basically unchanged, the second switch current increases linearly, realizing non-resonant zero-current soft switching, and the first switch current increases linearly.

[0026] The formula is as follows: Compared with existing technologies, this invention has the following advantages and beneficial effects: This invention innovatively proposes a hybrid converter circuit combining isolated high-gain resonant and non-resonant soft-switching technologies, effectively integrating the advantages of both types of soft-switching techniques. This topology achieves zero-voltage switching through resonant soft-switching during critical operating phases, significantly reducing switching losses and electromagnetic interference; simultaneously, by introducing a non-resonant soft-switching mechanism within a wide range of adjustment, it overcomes the inherent shortcomings of pure resonant converters, such as limited gain and poor load adaptability, achieving efficient and stable operation across the entire load range.

[0027] Furthermore, this circuit employs a transformer for electrical isolation and voltage transformation, enhancing system safety while expanding the gain range. Its structural design balances simplicity and symmetry, reducing the number of switching devices, lowering system cost and complexity, and ensuring low ripple and high dynamic response throughout bidirectional energy transmission.

[0028] This invention is particularly suitable for applications with wide input / output voltage ranges and stringent requirements for efficiency, power density, and electromagnetic compatibility, such as on-board power supplies for new energy vehicles, bidirectional converters for energy storage systems, and power supply modules for data centers. This topology exhibits good parameter adaptability, excellent thermal management performance, and high reliability, providing a competitive technological path for next-generation high-efficiency, high-density power electronic conversion devices. Attached Figure Description

[0029] Figure 1 is a topology diagram of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0030] Figure 2 is a diagram showing the main theoretical waveforms of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0031] Figure 3 is a first operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0032] Figure 4 is a second operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0033] Figure 5 is a third operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0034] Figure 6 is a fourth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0035] Figure 7 is the fifth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0036] Figure 8 is a sixth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0037] Figure 9 is a seventh operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0038] Figure 10 is the eighth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0039] Figure 11 is the ninth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0040] Figure 12 is the tenth operating mode diagram of the topology of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0041] Figure 13 is a simulation waveform diagram of the driving signals of the first switch S1 and the second switch S2 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0042] Figure 14 is a simulation waveform diagram of the driving signals of the third switch S3 and the fourth switch S4 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0043] Figure 15 is a simulation waveform of the current of the first switch S1 and the second switch S2 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0044] Figure 16 is a simulation waveform of the current of the third switch S3 and the fourth switch S4 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0045] Figure 17 is a simulation waveform of the current of the first diode D1 and the second diode D2 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0046] Figure 18 is a simulation waveform of the current of the auxiliary inductor Lk in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention.

[0047] Figure 19 is a simulation waveform diagram of the output voltage Vo and the input voltage Vin in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0049] As shown in Figure 1, this embodiment discloses a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching, comprising a low-voltage side module, a soft-switching module, an isolation module, and a high-voltage side module.

[0050] The low-voltage side module includes a low-voltage power supply VL, a first inductor L1, a second inductor L2, a first switching transistor S1, and a second switching transistor S2. The positive terminal of the low-voltage power supply VL is connected to the first terminal of the first inductor L1 and the first terminal of the second inductor L2, respectively. The second terminal of the first inductor L1 is connected to the drain of the first switching transistor S1. The second terminal of the second inductor L2 is connected to the drain of the second switching transistor S2. The sources of the first switching transistor S1 and the second switching transistor S2 are both connected to the negative terminal of the low-voltage power supply VL.

[0051] The soft-switching module includes an auxiliary inductor Lk, a first capacitor C1, and a second capacitor C2. The first terminal of the first capacitor C1 is connected to the first terminal of the auxiliary inductor Lk and the second terminal of the first inductor L1, and the second terminal of the first capacitor C1 is connected to the source of a third switching transistor S3. The first terminal of the auxiliary inductor Lk is connected to the second terminal of the first inductor L1, and the second terminal of the auxiliary inductor Lk is connected to the low-voltage side terminal of transformer T1. The first terminal of the second capacitor C2 is connected to the other end of the low-voltage side of transformer T1 and the drain of the second switching transistor S2, and the second terminal of the second capacitor C2 is connected to the source of a fourth switching transistor S4.

[0052] The isolation module consists of a transformer T1. The low-voltage side of the transformer T1 is connected to the second terminal of the auxiliary inductor Lk. The other terminal of the low-voltage side of the transformer T1 is connected to the first terminal of the second capacitor C2. The high-voltage side of the transformer T1 is connected to the first terminal of the high-voltage capacitor Cd. The other terminal of the high-voltage side of the transformer T1 is connected to the first terminal of the first diode D1.

[0053] The high-voltage side module includes a high-voltage side capacitor Cd, an output capacitor Co, a first diode D1, a second diode D2, and a load resistor RL. The first terminal of the high-voltage side capacitor Cd is connected to the corresponding terminal on the high-voltage side of transformer T1, and the second terminal of the high-voltage side capacitor Cd is connected to the second terminal of the first diode D1 and the first terminal of the second diode D2. The first terminal of the output capacitor Co is connected to the second terminal of the second diode D2 and the first terminal of the load resistor RL, and the second terminal of the output capacitor Co is connected to the other high-voltage side of transformer T1, the first terminal of the first diode D1, the second terminal of the output capacitor Co, and the second terminal of the load resistor RL.

[0054] As shown in Figure 2, the hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching described above in this embodiment has ten operating modes.

[0055] In the operating mode, there are first to tenth operating modes, which are executed sequentially as follows: In the first operating mode, as shown in Figure 3, the first switch S1 is turned off, and the second switch S2, the third switch S3, and the fourth switch S4 are all turned on. The low-voltage power supply VL charges the second inductor L2, and the first inductor L1 and the low-voltage power supply VL charge the first capacitor C1 together. The energy stored in the auxiliary inductor Lk is transferred to the first capacitor C1 and the high-voltage side of the transformer T1. The current of the auxiliary inductor Lk decreases linearly, which causes the current of the third switch S3 to decrease linearly, realizing the non-resonant zero-voltage soft switch conduction. The current of the second diode D2 increases linearly, realizing the non-resonant zero-current soft switch conduction.

[0056] In the second operating mode, as shown in Figure 4, it has the same switching state as the first operating mode. The difference is that the current direction of the auxiliary inductor changes. The low-voltage power supply charges the second inductor, and the first inductor and the low-voltage power supply charge the first capacitor and the auxiliary inductor together. The energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer. The current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the second switch, a linear decrease in the current of the third switch, and a linear increase in the current of the second diode.

[0057] In the third operating mode, as shown in Figure 5, the switching state is the same as in the second operating mode. The difference is that the current direction of the third switch changes. The low-voltage power supply charges the second inductor. The energy stored in the first inductor, the low-voltage power supply, and the first capacitor is transferred to the auxiliary inductor and the high-voltage side of the transformer. The current of the auxiliary inductor increases linearly, the current of the second switch increases linearly, the current of the third switch increases linearly, and the current of the second diode increases linearly.

[0058] In the fourth operating mode, as shown in Figure 6, the first and third switches are both off, while the second and fourth switches are both on. The low-voltage power supply charges the second inductor, and the parasitic capacitance of the first inductor, the low-voltage power supply, and the first switch resonate. The energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer, and the current of the auxiliary inductor decreases nonlinearly, which leads to a nonlinear decrease in the current of the second switch and a nonlinear decrease in the current of the second diode, thus achieving resonant zero-current soft-switching turn-off.

[0059] In the fifth operating mode, as shown in Figure 7, the first, second, and fourth switches are all turned on, while the third switch is turned off first and then turned on. The low-voltage power supply simultaneously charges the first and second inductors. The auxiliary inductor is short-circuited, and the current of the auxiliary inductor remains basically unchanged. The current of the first switch increases linearly, realizing non-resonant zero-current soft switching. The current of the second switch also increases linearly.

[0060] In the sixth operating mode, as shown in Figure 8, the second switch is turned off, and the first, third, and fourth switches are all turned on. The low-voltage power supply charges the first inductor, and the second inductor and the low-voltage power supply charge the second capacitor together. The energy stored in the auxiliary inductor is transferred to the second capacitor and the high-voltage side of the transformer. The current of the auxiliary inductor decreases linearly, which leads to a linear increase in the current of the first switch, a linear decrease in the current of the fourth switch, and a linear increase in the current of the first diode.

[0061] In the seventh operating mode, as shown in Figure 9, the off state is the same as the sixth operating mode, except that the current direction of the auxiliary inductor changes. The low-voltage power supply charges the first inductor, and the energy stored in the second inductor and the low-voltage power supply is transferred to the second capacitor, the auxiliary inductor, and the high-voltage side of the transformer. The energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer, and the current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the first switch, a linear decrease in the current of the fourth switch, and a linear increase in the current of the first diode.

[0062] In the eighth operating mode, as shown in Figure 10, the switching state is the same as in the seventh operating mode. The difference is that the current direction of the fourth switch changes. The low-voltage power supply charges the first inductor, and the energy stored in the second inductor, the low-voltage power supply, and the second capacitor is transferred to the auxiliary inductor and the high-voltage side of the transformer. The current of the auxiliary inductor increases linearly, which leads to a linear increase in the current of the first switch, a linear increase in the current of the fourth switch, and a linear increase in the current of the first diode.

[0063] In the ninth operating mode, as shown in Figure 11, the first and third switches are turned on, while the second and fourth switches are turned off. The low-voltage power supply charges the first inductor, and the parasitic capacitance of the second inductor, the low-voltage power supply, and the second switch resonates. The energy stored in the auxiliary inductor is transferred to the high-voltage side of the transformer, and the current of the auxiliary inductor decreases nonlinearly, which leads to a nonlinear decrease in the current of the first switch and a nonlinear decrease in the current of the first diode, thus achieving resonant zero-current soft-switching turn-off.

[0064] In the tenth operating mode, as shown in Figure 12, the first, second, and third switches are all turned on, and the fourth switch is turned off first and then turned on. The low-voltage power supply charges the first and second inductors simultaneously, the auxiliary inductor is short-circuited, the current of the auxiliary inductor remains basically unchanged, the current of the second switch increases linearly, realizing non-resonant zero-current soft switching, and the current of the first switch increases linearly.

[0065] Below, we will perform simulation verification of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention. Specifically, in order to verify the theoretical analysis of the hybrid converter circuit utilizing the linear change of auxiliary inductor current and the resonance of inductor and capacitor, a simulation platform was built based on the simulation parameters of the hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching in Table 1 below.

[0066] Table 1 Under the parameters in Table 1, the drive control signal waveforms of the first switch S1 and the second switch S2 in a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention are shown in Figure 13. It can be seen that the duty cycles of the control signals for the first switch S1 and the second switch S2 are the same, and their phases differ by 180°. The drive control signal waveforms of the third switch S3 and the fourth switch S4 are shown in Figure 14. It can be seen that the duty cycles of the control signals for the third switch S3 and the fourth switch S4 are the same, and their phases differ by 180°. Under such a switching control sequence, the simulated current waveforms of the first switch S1 and the second switch S2 according to an embodiment of the present invention are shown in Figure 15. It can be seen that the current of both switches increases linearly from zero, achieving NRZCS turn-on and reducing switching losses. The simulated current waveforms of the third switch S3 and the fourth switch S4 are shown in Figure 16. It can be seen that the voltages of both switches are zero before conduction, achieving NRZVS conduction and reducing switching losses.

[0067] Furthermore, under the parameters in Table 1, the simulated current waveforms of the first diode D1 and the second diode D2 of a hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to an embodiment of the present invention are shown in Figure 17. It can be seen that the current of both diodes increases linearly from zero, and the process of the current dropping to zero shows the characteristics of resonant change, thus realizing RZCS turn-off.

[0068] To further demonstrate that the NRZCS and NRZVS characteristics of the switching transistor are due to the linear change of the auxiliary inductor current under the constraint of node KCL, Figure 18 provides the current simulation waveform of the auxiliary inductor Lk. The current shown in Figure 18 exhibits a linear increase during the current increase process.

[0069] Furthermore, a simulation waveform of a non-isolated high-gain bidirectional non-resonant linear soft-switching converter circuit implementing boost conversion according to an embodiment of the present invention is provided, as shown in Figure 19. It can be observed that when the input voltage is 30V, the output voltage is 400V, verifying the high-gain voltage conversion function of the converter circuit.

[0070] In the description of this invention patent, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and are not intended to 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 the invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this invention patent, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In this invention patent, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hybrid converter circuit combining isolated high-gain resonant and non-resonant soft-switching, characterized in that, include: The low-voltage side module consists of a low-voltage power supply, two inductors, and two switching transistors; the soft-switching module consists of an inductor, two capacitors, and two switching transistors; the isolation module consists of a transformer (T1); the high-voltage side module consists of two capacitors, two diodes, and a resistor; wherein, the low-voltage side module includes a low-voltage power supply (V L The components include a first inductor (L1), a second inductor (L2), a first switching transistor (S1), and a second switching transistor (S2), and the low-voltage power supply (V). L The positive terminals of the first inductor (L1) and the second inductor (L2) are respectively connected to the first terminals of the first inductor (L1) and the second inductor (L2); the second terminal of the first inductor (L1) is connected to the drain of the first switching transistor (S1); the second terminal of the second inductor (L2) is connected to the drain of the second switching transistor (S2); the sources of the first switching transistor (S1) and the second switching transistor (S2) are connected to the low-voltage power supply (V). L The negative terminal of the soft-switching module; wherein, the soft-switching module includes an auxiliary inductor (L k A first capacitor (C1) and a second capacitor (C2), wherein the first terminal of the first capacitor (C1) is connected to an auxiliary inductor (L). k The first terminal of the first inductor (L1) and the second terminal of the first capacitor (C1) are connected to the source of the third switch (S3); the auxiliary inductor (L... k The first terminal of the auxiliary inductor (L1) is connected to the second terminal of the first inductor (L1), and the second terminal of the auxiliary inductor (L2) is connected to the second terminal of the first inductor (L1). k The second terminal of the second capacitor (C2) is connected to the low-voltage side terminal of the transformer (T1); the first terminal of the second capacitor (C2) is connected to the other end of the low-voltage side of the transformer (T1) and the drain of the second switch (S2); the second terminal of the second capacitor (C2) is connected to the source of the fourth switch (S4); wherein, the isolation module consists of a transformer (T1), and the low-voltage side terminal of the transformer (T1) is connected to the auxiliary inductor (L). k The second terminal of the transformer (T1) is connected to the other terminal of the low-voltage side, which is connected to the first terminal of the second capacitor (C2). The corresponding terminal of the transformer (T1) on the high-voltage side is connected to the high-voltage side capacitor (C). d The first terminal of the transformer (T1) is connected to the first terminal of the first diode (D1); wherein, the high-voltage side module includes the high-voltage side capacitor (C). d ), output capacitor (C) o ), first diode (D1), second diode (D2), and load resistor (R) L The high-voltage side capacitor (C) d The first terminal of the capacitor is connected to the high-voltage side terminal of the transformer (T1), and the high-voltage side capacitor (C) d The second terminal of the first diode (D1) is connected to the second terminal of the second diode (D2); the output capacitor (C) o The first terminal of the first diode (D2) is connected to the second terminal of the second diode (D2) and the load resistor (R). L The first terminal of the output capacitor (C) o The second terminal of the diode is connected to the other end of the high-voltage side of the transformer (T1), the first terminal of the first diode (D1), and the output capacitor (C). o The second terminal of ) and the load resistor (R) L The second end of ).

2. The hybrid converter circuit of isolated high-gain resonant and non-resonant soft switching according to claim 1, characterized in that, In the operating mode, there are tenth operating modes, which are executed sequentially. In the first operating mode: the first switch (S1) is off, and the second switch (S2), third switch (S3), and fourth switch (S4) are all on; the low-voltage power supply (V... L The first inductor (L1) charges the second inductor (L2); the first inductor (L1) and the low-voltage power supply (V) L Together, they charge the first capacitor (C1); the auxiliary inductor (L) k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the first capacitor (C1) and the transformer (T1); k The current decreases linearly, causing the current of the third switch (S3) to decrease linearly, achieving non-resonant zero-voltage soft switching. The current of the second diode (D2) increases linearly, achieving non-resonant zero-current soft switching. The formula is as follows: In the formula, t is the working time, and v is the working time. L It is a low-voltage power supply (V) L The voltage of transformer (T1) is given by u1, where u1 is the voltage on the low-voltage side and u2 is the voltage on the high-voltage side. C1 It is the voltage across the first capacitor (C1), u Cd It is the high-voltage side capacitor (C) d The voltage of u Co It is the output capacitor (C) o The voltage of ), l1 is the inductance value of the first inductor (L1), l2 is the inductance value of the second inductor (L2), l k It is an auxiliary inductor (L) k The inductance value of i L1 It is the current of the first inductor (L1), i L2 It is the current of the second inductor (L2), i Lk It is an auxiliary inductor (L) k The current of the auxiliary inductor (L); Second operating mode: The switching state is the same as the first operating mode, the difference being the auxiliary inductor (L k The direction of current changes in the low-voltage power supply (V). L The first inductor (L1) charges the second inductor (L2); the first inductor (L1) and the low-voltage power supply (V) L Together, they supply power to the first capacitor (C1) and the auxiliary inductor (L). k Charging; auxiliary inductor (L) k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the transformer (T1); k A linear increase in current leads to a linear increase in the current of the second switch (S2), a linear decrease in the current of the third switch (S3), and a linear increase in the current of the second diode (D2); the formula is as follows: Third operating mode: The switching state is the same as the second operating mode, except that the current direction of the third switch (S3) changes; Low-voltage power supply (V L The first inductor (L1) charges the second inductor (L2); the first inductor (L1) and the low-voltage power supply (V) L The energy stored in the first capacitor (C1) and the first capacitor (C1) together supply energy to the auxiliary inductor (L). k ) and transformer (T1) high-voltage side transfer; auxiliary inductor (L k The current increases linearly, the current of the second switch (S2) increases linearly, the current of the third switch (S3) increases linearly, and the current of the second diode (D2) increases linearly; the formula is the same as that of the second operating mode; the fourth operating mode: the first switch (S1) and the third switch (S3) are both off, and the second switch (S2) and the fourth switch (S4) are both on; the low-voltage power supply (V L The first inductor (L1) charges the second inductor (L2); the first inductor (L1) and the low-voltage power supply (V) L The parasitic capacitance of the first switching transistor (S1) resonates; the auxiliary inductor (L) k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the transformer (T1); k The nonlinear decrease in current leads to a nonlinear decrease in the current of the second switch (S2), and a nonlinear decrease in the current of the second diode (D2), achieving resonant zero-current soft-switching turn-off; the formula is as follows: In the formula, u Coss1 It is the capacitance value of the parasitic capacitance of the first switching transistor (S1); Fifth operating mode: the first switching transistor (S1), the second switching transistor (S2), and the fourth switching transistor (S4) are all turned on, and the third switching transistor (S3) is turned off first and then turned on; Low voltage power supply (V L Simultaneously charging the first inductor (L1) and the second inductor (L2); the auxiliary inductor (L... k Short circuit; auxiliary inductor (L) k With the current remaining essentially constant, the current of the first switch (S1) increases linearly, achieving non-resonant zero-current soft switching. The current of the second switch (S2) also increases linearly. The formulas are as follows: In the formula, u RL It is the voltage across the output resistor; Sixth operating mode: the second switch (S2) is off, and the first switch (S1), the third switch (S3), and the fourth switch (S4) are all on; Low-voltage power supply (V L The first inductor (L1) is charged; the second inductor (L2) and the low-voltage power supply (V) are charged. L Together, they charge the second capacitor (C2); the auxiliary inductor (L) k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the second capacitor (C2) and the transformer (T1); k The current of the first switch (S1) decreases linearly, causing the current of the fourth switch (S4) to increase linearly, and the current of the first diode (D1) to increase linearly; the formula is as follows: Seventh operating mode: The switching state is the same as the sixth operating mode, the difference being the auxiliary inductor (L). k The direction of current changes in the low-voltage power supply (V). L The first inductor (L1) is charged; the second inductor (L2) and the low-voltage power supply (V) are charged. L The energy stored in the capacitor is transferred to the second capacitor (C2) and the auxiliary inductor (L). k ) and transformer (T1) high-voltage side transfer; auxiliary inductor (L k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the transformer (T1); k The current of the first switch (S1) increases linearly, causing the current of the fourth switch (S4) to increase linearly, and the current of the first diode (D1) to decrease linearly; the formula is the same as that of the sixth operating mode; the eighth operating mode: the switching state is the same as that of the seventh operating mode, the difference being that the current direction of the fourth switch (S4) changes; the low-voltage power supply (V L The first inductor (L1) is charged; the second inductor (L2) and the low-voltage power supply (V) are charged. L The energy stored in the second capacitor (C2) and the second capacitor (C2) together supply energy to the auxiliary inductor (L). k ) and transformer (T1) high-voltage side transfer; auxiliary inductor (L k The current of the first switch (S1) increases linearly, leading to a linear increase in the current of the fourth switch (S4) and the first diode (D1); the formula is the same as that of the sixth operating mode; the ninth operating mode: the first switch (S1) and the third switch (S3) are turned on, and the second switch (S2) and the fourth switch (S4) are turned off; the low-voltage power supply (V L The first inductor (L1) is charged; the second inductor (L2) and the low-voltage power supply (V) are charged. L The parasitic capacitance of the second switch (S2) resonates; the auxiliary inductor (L) k The energy stored in the auxiliary inductor (L) is transferred to the high-voltage side of the transformer (T1); k The nonlinear decrease in current leads to a nonlinear decrease in the current of the first switch (S1) and the first diode (D1), thus achieving resonant zero-current soft-switching turn-off; the formula is as follows: In the formula, u Coss2 It is the capacitance value of the parasitic capacitance of the second switch (S2); Tenth operating mode: the first switch (S1), the second switch (S2), and the third switch (S3) are all turned on, and the fourth switch (S4) is turned off first and then turned on; Low voltage power supply (V L Simultaneously charging the first and second inductors (L2); the auxiliary inductor (L... k Short circuit; auxiliary inductor (L) k The current remains essentially constant, while the current of the second switch (S2) increases linearly, achieving non-resonant zero-current soft switching. The current of the first switch (S1) also increases linearly. The formulas are as follows: 。

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