High gain dc-dc converter integrated with active switched-inductor and y-source voltage doubler cell

Abstract

The application provides a high-gain DC-DC converter integrated with an active switching inductor and a Y-source voltage doubling unit, relates to the technical field of DC-DC conversion equipment, and comprises a direct-current power supply V g , an active switching inductor structure, a Y-source voltage doubling unit, a clamping loop, a first energy storage capacitor C1, a third energy storage capacitor C3, a fourth energy storage capacitor C4, a sixth energy storage capacitor C6, a second diode D2, a fourth diode D4 and a load side; the application utilizes the active switching inductor structure to realize continuous input current and reduce the voltage stress of a switching tube; the symmetrical three-winding coupled inductor structure enables the converter to realize high voltage gain under a small coupled inductor total turn ratio and a proper duty cycle. The whole circuit has high boosting capability, the clamping loop reduces the voltage peak of the main switching device and increases the reliability of the circuit structure. On the basis of ensuring the efficiency, high-gain boosting capability is realized, the service life of the active device is prolonged, and the application has great application potential in the development of photovoltaic new energy industry.

Description

Technical Field

[0001] This invention relates to the field of DC-DC conversion equipment technology, and in particular to a high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit. Background Technology

[0002] The global energy crisis and environmental problems have prompted research into new renewable energy sources. With strong government support for renewable energy, new energy power generation has enormous potential and development space. New energy power generation systems require high-gain DC-DC boost converters to raise the relatively low output voltage of photovoltaic and fuel cell systems to the high-voltage DC bus, which is then connected to DC loads or grid-connected inverters to form photovoltaic power generation systems and new energy vehicle power systems. In addition, high-gain boost converters are also widely used in modern industrial applications, transportation, data centers, and medical facilities. Therefore, high-performance, high-efficiency DC-DC boost converters have significant research value and importance.

[0003] The paper “MA Salvador, JMde Andrade, TB Lazzarin and R.F. Coelho. Nonisolated High-Step-Up DC–DC Converter Derived from Switched-Inductors and Switched-Capacitors[J].IEEE Transactions on Industrial Electronics,2020,67(10):8506-8516” proposes a high-gain DC-DC converter that combines active switched inductors and switched capacitors. This converter has fewer components and low voltage stress on the switching transistors and diodes. However, the voltage gain of this converter can only be improved by adjusting the high duty cycle, which has a relatively low degree of design freedom.

[0004] The paper “YLJi,HCLiu,Y.Feng,FJWu,and P.Wheeler.High Step-Up Y-SourceCoupled-Inductor Impedance Network Boost DC–DC Converters With Common Ground and Continuous Input Current[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2020,8(3):3174-3183” proposes a Y-source boost converter with continuous input current and flexible voltage gain adjustment. However, the active device experiences high voltage stress, affecting its lifespan. Furthermore, the converter's voltage gain is insufficient, making it unsuitable for high-voltage applications.

[0005] The paper “T.-J.Liang,P.Luo and K.-H.Chen.A High Step-Up DC–DC ConverterWith Three-Winding Coupled Inductor for Sustainable Energy Systems[J].IEEE Transactions on Industrial Electronics,2022,69(10):10249-10258” proposes a converter that integrates active switching inductor and switched capacitor technologies into a three-winding coupled inductor, which has continuous input current and low device voltage stress. However, this converter can only obtain higher gain by continuously increasing the turns ratio and duty cycle, which is not conducive to the coordination of overall efficiency and gain.

[0006] Therefore, a converter that can achieve low switching voltage stress, continuous input current, high degree of freedom adjustment, and high boost capability and high efficiency without requiring a large total turns ratio of the coupling inductor has become a research hotspot in this field. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit. The entire circuit structure is clear and symmetrical. The front-end circuit uses an active switching inductor instead of the LC filter circuit typically used in converters, which not only enables continuous input current but also achieves low switching transistor voltage stress and voltage boost functionality. Simultaneously, the voltage gain is flexibly adjusted through the design of the Y-source voltage multiplier unit. The combination of these two elements enables the entire circuit to achieve a high boost capability.

[0008] A high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit, specifically comprising: a DC power supply V g The active switching inductor structure, Y-source voltage multiplier unit, clamping circuit, first energy storage capacitor C1, third energy storage capacitor C3, fourth energy storage capacitor C4, sixth energy storage capacitor C6, second diode D2, fourth diode D4 and load side;

[0009] The active switching inductor structure comprises a first energy storage inductor L1, a first switching transistor S1, a second energy storage inductor L2, and a second switching transistor S2.

[0010] The Y-source voltage multiplier unit consists of two symmetrical three-winding coupled inductors, namely an upper three-winding coupled inductor and a lower three-winding coupled inductor. The Y-source structure of the upper three-winding coupled inductor is composed of a first coupled inductor N1, a second coupled inductor N2, and a third coupled inductor N3. The Y-source structure of the lower three-winding coupled inductor is composed of a fourth coupled inductor N4, a fifth coupled inductor N5, and a sixth coupled inductor N6.

[0011] The clamping circuit consists of a first diode D1, a second energy storage capacitor C2, a third diode D3, and a fifth energy storage capacitor C5. The load side consists of an output diode D... o Output capacitor C o It consists of a load R.

[0012] The DC power supply V g The positive terminal of the first energy storage inductor is connected to the positive terminal of the second switch S2, one end of the first energy storage inductor L1, and the positive terminal of the fifth energy storage capacitor C5; the other end of the first energy storage inductor L1 is connected to the positive terminal of the first switch S1, the negative terminal of the first energy storage capacitor C1, and the positive terminal of the first diode D1. The negative terminal of the first switch S1 is connected to the negative terminal of the second energy storage capacitor C2, one end of the second energy storage inductor L2, and V gThe negative terminal of the first energy storage capacitor C1 is connected to the same-name terminal of the third coupling inductor N3. The opposite-name terminal of the third coupling inductor N3 is connected to the opposite-name terminal of the first coupling inductor N1, the same-name terminal of the second coupling inductor N2, and the positive terminal of the second diode D2. The same-name terminal of the first coupling inductor N1 is connected to the positive terminal of the second energy storage capacitor C2 and the negative terminal of the first diode D1. The opposite-name terminal of the second coupling inductor N2 is connected to the negative terminal of the third energy storage capacitor C3. The negative terminal of the second switching transistor S2 is connected to the negative terminal of the third diode D3, the positive terminal of the fourth energy storage capacitor C4, and the other end of the second energy storage inductor L2. The negative terminal of the fifth energy storage capacitor C5 is connected to the same-name terminal of the fourth coupling inductor N4 and the positive terminal of the third diode D3. The opposite-name terminal of the fourth coupling inductor N4 is connected to the opposite-name terminal of the sixth coupling inductor N6, the same-name terminal of the fifth coupling inductor N5, and the negative terminal of the fourth diode D4. The negative terminal of the fourth energy storage capacitor C4 is connected to the same-name terminal of the sixth coupling inductor N6. The positive terminal of the sixth energy storage capacitor C6 is connected to the opposite-name terminal of the fifth coupling inductor N5. The negative terminal of the second diode D2 is connected to the positive terminal of the third energy storage capacitor C3 and the load-side output diode D. o The positive terminal is connected. The output diode D on the load side... o The negative terminal and output capacitor C o The positive terminal of the capacitor is connected to one end of the load R. The negative terminal of the sixth energy storage capacitor C6 and the output capacitor C are connected together. o The negative terminal of the diode is connected to the other end of the load R and the positive terminal of the fourth diode D4.

[0013] The upper three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N1:N2:N3. k1 and excitation inductance L m1 The lower three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N4:N5:N6. k2 and excitation inductance L m2 The two have identical coupling windings, and the turns ratio is simplified to 1:n1:n2, where n1 = N2 / N1 = N5 / N4, and n2 = N3 / N1 = N6 / N4.

[0014] Both the first switch S1 and the second switch S2 are N-channel MOS transistors, and both the gate and source of the switch transistors can receive control signals from the external main control chip; at the same time, a unipolar PWM control method is used to control the two switch transistors to achieve a state of simultaneous conduction or cutoff.

[0015] The beneficial effects of adopting the above technical solution are as follows:

[0016] This invention provides a high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit. The active switching inductor structure employed in this invention significantly reduces the voltage stress on the switching transistors, allowing for the selection of components with low voltage ratings and low on-resistance in actual circuit design, thus reducing losses and improving circuit efficiency. Furthermore, it provides a certain voltage gain. The symmetrical three-winding coupled inductor structure allows for flexible adjustment of the voltage gain of the proposed topology by changing the turns ratio of the coupled inductor, avoiding the limiting duty cycle of the switching transistors at high voltage gains. The clamping circuit effectively reduces voltage spikes in the main switching device and increases the overall reliability of the circuit structure. Therefore, this invention features a novel structure, a reasonable overall design, high safety and reliability, high operating efficiency, and a wide range of applications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the circuit structure principle of the present invention.

[0018] Figure 2 This is a schematic diagram of the switching transistor control signal described in this invention.

[0019] Figure 3 This is a diagram showing the operating mode of the power switch transistor in this invention.

[0020] Figure 4 This is a diagram showing the working mode of the power switch transistor turning off according to the present invention.

[0021] Figure 5 The graph shows the relationship between voltage gain and duty cycle when the turns ratio of the coupling inductor n1 is 1 and n2 is 0.5 in the converter proposed in this invention.

[0022] Figure 6 This is a Saber simulation diagram of the converter proposed in this invention. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] A high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit, such as Figure 1 As shown, it specifically includes: DC power supply V g The active switching inductor structure, Y-source voltage multiplier unit, clamping circuit, first energy storage capacitor C1, third energy storage capacitor C3, fourth energy storage capacitor C4, sixth energy storage capacitor C6, second diode D2, fourth diode D4 and load side;

[0025] The active switching inductor structure comprises a first energy storage inductor L1, a first switching transistor S1, a second energy storage inductor L2, and a second switching transistor S2.

[0026] The Y-source voltage multiplier unit consists of two symmetrical three-winding coupled inductors, namely an upper three-winding coupled inductor and a lower three-winding coupled inductor. The Y-source structure of the upper three-winding coupled inductor is composed of a first coupled inductor N1, a second coupled inductor N2, and a third coupled inductor N3. The Y-source structure of the lower three-winding coupled inductor is composed of a fourth coupled inductor N4, a fifth coupled inductor N5, and a sixth coupled inductor N6.

[0027] The clamping circuit consists of a first diode D1, a second energy storage capacitor C2, a third diode D3, and a fifth energy storage capacitor C5. The load side consists of an output diode D... o Output capacitor C o It consists of a load R.

[0028] The DC power supply V g The positive terminal of the first energy storage inductor is connected to the positive terminal of the second switch S2, one end of the first energy storage inductor L1, and the positive terminal of the fifth energy storage capacitor C5; the other end of the first energy storage inductor L1 is connected to the positive terminal of the first switch S1, the negative terminal of the first energy storage capacitor C1, and the positive terminal of the first diode D1. The negative terminal of the first switch S1 is connected to the negative terminal of the second energy storage capacitor C2, one end of the second energy storage inductor L2, and V g The negative terminal of the first energy storage capacitor C1 is connected to the same-name terminal of the third coupling inductor N3. The opposite-name terminal of the third coupling inductor N3 is connected to the opposite-name terminal of the first coupling inductor N1, the same-name terminal of the second coupling inductor N2, and the positive terminal of the second diode D2. The same-name terminal of the first coupling inductor N1 is connected to the positive terminal of the second energy storage capacitor C2 and the negative terminal of the first diode D1. The opposite-name terminal of the second coupling inductor N2 is connected to the negative terminal of the third energy storage capacitor C3. The negative terminal of the second switching transistor S2 is connected to the negative terminal of the third diode D3, the positive terminal of the fourth energy storage capacitor C4, and the other end of the second energy storage inductor L2. The negative terminal of the fifth energy storage capacitor C5 is connected to the same-name terminal of the fourth coupling inductor N4 and the positive terminal of the third diode D3. The opposite-name terminal of the fourth coupling inductor N4 is connected to the opposite-name terminal of the sixth coupling inductor N6, the same-name terminal of the fifth coupling inductor N5, and the negative terminal of the fourth diode D4. The negative terminal of the fourth energy storage capacitor C4 is connected to the same-name terminal of the sixth coupling inductor N6. The positive terminal of the sixth energy storage capacitor C6 is connected to the opposite-name terminal of the fifth coupling inductor N5. The negative terminal of the second diode D2 is connected to the positive terminal of the third energy storage capacitor C3 and the load-side output diode D. o The positive terminal is connected. The output diode D on the load side... o The negative terminal and output capacitor C o The positive terminal of the capacitor is connected to one end of the load R. The negative terminal of the sixth energy storage capacitor C6 and the output capacitor C are connected together.o The negative terminal of the diode is connected to the other end of the load R and the positive terminal of the fourth diode D4.

[0029] The upper three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N1:N2:N3. k1 and excitation inductance L m1 The lower three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N4:N5:N6. k2 and excitation inductance L m2 The two have identical coupling windings, and the turns ratio is simplified to 1:n1:n2, where n1 = N2 / N1 = N5 / N4, and n2 = N3 / N1 = N6 / N4.

[0030] Both the first switch S1 and the second switch S2 are N-channel MOS transistors, and both the gate and source of the switch transistors can receive control signals from the external main control chip; at the same time, a unipolar PWM control method is used to control the two switch transistors to achieve a state of simultaneous conduction or cutoff.

[0031] In this embodiment of the invention, the converter operates as follows: when both switching transistors are turned on, the DC power supply V... g Energy is transferred to the first energy storage inductor L1 and the second energy storage inductor L2 through two switching transistors. The two energy storage inductors begin to store energy, and the current i... L1 i L2 The energy storage capacitor C2 continuously increases. The second energy storage capacitor C2 transfers energy to the magnetizing inductor L. m1 The third coupling inductor N3 and the first energy storage capacitor C1. Simultaneously, the magnetizing inductor L... m1 Energy is transferred to the second coupling inductor N2, which charges the third energy storage capacitor C3 through the second diode D2. The fifth energy storage capacitor C5 transfers energy to the magnetizing inductor L. m2 The sixth coupling inductor N6 and the fourth energy storage capacitor C4. Simultaneously, the magnetizing inductor L... m2 Energy is transferred to the fifth coupling inductor N5, which charges the sixth energy storage capacitor C6 through the fourth diode D4. The load-side output capacitor C... o The discharge provides energy to the load R. With both switches off, the operating mode diagram of the circuit topology is as follows: Figure 4 As shown. At this time, the first energy storage inductor L1 supplies power to the second energy storage capacitor C2 through the first diode D1, and the second energy storage inductor L2 supplies power to the fifth energy storage capacitor C5 through the third diode D3. Therefore, the current in the input energy storage inductors L1 and L2 decreases linearly. When the switching transistor is turned off, the magnetizing inductor L... m1 L m2 Forward discharge. DC power supply V gThe first energy storage inductor L1, the second energy storage inductor L2, the second coupling inductor N2, the third coupling inductor N3, the fifth coupling inductor N5, the sixth coupling inductor N6, and the energy storage capacitors C1, C3, C4, and C6 are connected together through diode D. o For the output capacitor C o The load R provides energy.

[0032] In this embodiment, the control signals for the first switch S1 and the second switch S2 are as follows: Figure 2 As shown, both are simultaneously turned on and off. Within one cycle, in DT... S During this period, the switching transistor is turned on, at (1-D)T S During this period, the switching transistor is off. To simplify the analysis, the leakage inductance on the coupling inductor is ignored in the steady-state analysis, and the transformer is an ideal transformer. It is also assumed that the switching on and off of the transistor and diode are completed instantaneously, and the extremely short small modes caused by the delayed switching on or off of the transistor and diode are not considered. This embodiment has two main modes: a shoot-through state and a non-shoot-through state.

[0033] In the shoot-through state, when both switches are turned on, the operating mode diagram of the circuit topology is as follows: Figure 3 As shown. At this time, the DC power supply V g Energy is transferred to the first energy storage inductor L1 and the second energy storage inductor L2 through two switching transistors. The two energy storage inductors begin to store energy, and the current i... L1 i L2 The energy storage capacitor C2 continuously increases. The second energy storage capacitor C2 transfers energy to the magnetizing inductor L. m1 The third coupling inductor N3 and the first energy storage capacitor C1. Simultaneously, the magnetizing inductor L... m1 Energy is transferred to the second coupling inductor N2, which charges the third energy storage capacitor C3 through the second diode D2. The fifth energy storage capacitor C5 transfers energy to the magnetizing inductor L. m2 The sixth coupling inductor N6 and the fourth energy storage capacitor C4. Simultaneously, the magnetizing inductor L... m2 Energy is transferred to the fifth coupling inductor N5, which charges the sixth energy storage capacitor C6 through the fourth diode D4. The load-side output capacitor C... o The discharge provides energy to the load R. According to KVL, the voltage relationship when the switch is turned on is as follows:

[0034]

[0035] In the non-shoo-through state, when both switches are off, the operating mode diagram of the circuit topology is as follows: Figure 4As shown. At this time, the first energy storage inductor L1 supplies power to the second energy storage capacitor C2 through the first diode D1, and the second energy storage inductor L2 supplies power to the fifth energy storage capacitor C5 through the third diode D3. Therefore, the current in the input energy storage inductors L1 and L2 decreases linearly. When the switching transistor is turned off, the magnetizing inductor L... m1 L m2 Forward discharge. DC power supply V g The first energy storage inductor L1, the second energy storage inductor L2, the second coupling inductor N2, the third coupling inductor N3, the fifth coupling inductor N5, the sixth coupling inductor N6, and the energy storage capacitors C1, C3, C4, and C6 are connected together through diode D. o For the output capacitor C o The load R provides energy. According to KVL, the voltage relationship when the switch is off is as follows:

[0036]

[0037] The volt-second balance rule is applied to the first energy storage inductor L1, the second energy storage inductor L2, the first coupling inductor N1, the second coupling inductor N2, the third coupling inductor N3, the fourth coupling inductor N4, the fifth coupling inductor N5, and the sixth coupling inductor N6, and the formula is as follows:

[0038]

[0039] Where T s The converter's duty cycle;

[0040] Based on the above formula, the voltage gain G of the high-gain non-isolated DC-DC converter with voltage stabilization proposed in this invention in the continuous current state is:

[0041]

[0042] Figure 5 As shown, the coupling inductor with turns ratio n1 = 1 and n2 = 0.5 is designed, and the voltage gain as a function of duty cycle D is obtained as follows. Figure 5 As shown in the figure, when D = 0.5, a voltage gain of 15 times can be achieved.

[0043] The design specifies an input voltage of 20V, an output voltage of 300V, D = 0.5, n1 = 1, n2 = 0.5, a switching frequency of 50kHz, and an output power of 100W. Figure 6 The figure shows the voltage and current stresses of the active components in the converter. As can be seen from the figure, the voltage stress on the switching transistors is extremely low, ensuring the stability of the converter operation and improving the overall circuit efficiency.

[0044] In summary, the high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier proposed in this invention has the advantages of continuous input current, low switching transistor voltage stress, and flexible voltage gain adjustment. The combination of the active switching inductor and the Y-source voltage multiplier further enhances the high boost capability. The overall circuit has high safety and reliability, high operating efficiency, and demonstrates excellent inventive results.

[0045] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit, characterized in that, include: DC power supply V g The active switching inductor structure, Y-source voltage multiplier unit, clamping circuit, first energy storage capacitor C1, third energy storage capacitor C3, fourth energy storage capacitor C4, sixth energy storage capacitor C6, second diode D2, fourth diode D4 and load side; The active switching inductor structure comprises a first energy storage inductor L1, a first switching transistor S1, a second energy storage inductor L2, and a second switching transistor S2. The Y-source voltage multiplier unit consists of two symmetrical three-winding coupled inductors, namely an upper three-winding coupled inductor and a lower three-winding coupled inductor. The Y-source structure of the upper three-winding coupled inductor is composed of a first coupled inductor N1, a second coupled inductor N2, and a third coupled inductor N3. The Y-source structure of the lower three-winding coupled inductor is composed of a fourth coupled inductor N4, a fifth coupled inductor N5, and a sixth coupled inductor N6. The clamping circuit consists of a first diode D1, a second energy storage capacitor C2, a third diode D3, and a fifth energy storage capacitor C5. The load side consists of an output diode D... o Output capacitor C o It consists of a load R; The DC power supply V g The positive terminal of the first energy storage inductor is connected to the positive terminal of the second switch S2, one end of the first energy storage inductor L1, and the positive terminal of the fifth energy storage capacitor C5; the other end of the first energy storage inductor L1 is connected to the positive terminal of the first switch S1, the negative terminal of the first energy storage capacitor C1, and the positive terminal of the first diode D1; the negative terminal of the first switch S1 is connected to the negative terminal of the second energy storage capacitor C2, one end of the second energy storage inductor L2, and V g The negative terminal of the first energy storage capacitor C1 is connected to the same-name terminal of the third coupling inductor N3; the opposite-name terminal of the third coupling inductor N3 is connected to the opposite-name terminal of the first coupling inductor N1, the same-name terminal of the second coupling inductor N2, and the positive terminal of the second diode D2; the same-name terminal of the first coupling inductor N1 is connected to the positive terminal of the second energy storage capacitor C2 and the negative terminal of the first diode D1; the opposite-name terminal of the second coupling inductor N2 is connected to the negative terminal of the third energy storage capacitor C3; the negative terminal of the second switching transistor S2 is connected to the negative terminal of the third diode D3, the positive terminal of the fourth energy storage capacitor C4, and the positive terminal of the second energy storage capacitor C2. The other end of inductor L2 is connected; the negative terminal of the fifth energy storage capacitor C5 is connected to the same-name terminal of the fourth coupling inductor N4 and the positive terminal of the third diode D3; the opposite-name terminal of the fourth coupling inductor N4 is connected to the opposite-name terminal of the sixth coupling inductor N6, the same-name terminal of the fifth coupling inductor N5, and the negative terminal of the fourth diode D4; the negative terminal of the fourth energy storage capacitor C4 is connected to the same-name terminal of the sixth coupling inductor N6; the positive terminal of the sixth energy storage capacitor C6 is connected to the opposite-name terminal of the fifth coupling inductor N5; the negative terminal of the second diode D2 is connected to the positive terminal of the third energy storage capacitor C3 and the load-side output diode D o The positive terminal is connected; the output diode D on the load side is connected. o The negative terminal and output capacitor C o The positive terminal of the capacitor is connected to one end of the load R; the negative terminal of the sixth energy storage capacitor C6 and the output capacitor C are connected together. o The negative terminal of the diode is connected to the other end of the load R and the positive terminal of the fourth diode D4.

2. A high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit according to claim 1, characterized in that, The upper three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N1:N2:N3. k1 and excitation inductance L m1 The lower three-winding coupled inductor is equivalent to an ideal transformer L with a turns ratio of N4:N5:N6. k2 and excitation inductance L m2 The two windings are exactly the same, and the turns ratio is simplified to 1:n1:n2, where n1 = N2 / N1 = N5 / N4, and n2 = N3 / N1 = N6 / N4.

3. A high-gain DC-DC converter integrating an active switching inductor and a Y-source voltage multiplier unit according to claim 1, characterized in that, Both the first switch S1 and the second switch S2 are N-channel MOSFETs, and both the gate and source of the switch can receive control signals from the external main control chip. At the same time, a unipolar PWM control method is used to control the two switches to achieve a state of simultaneous conduction or cutoff.

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