Three-level dual-output active neutral point clamped converter

Abstract

The utility model belongs to the technical field of power electronics, and discloses a three-level dual-output active neutral point clamped converter, which is characterized in that the positive electrode of an input source Vdc is connected with the first end of a first capacitor C1 and the source electrode of a first switch tube S1, and the negative electrode of the input source Vdc is connected with the second end of a second capacitor C2 and the drain electrode of a fourth switch tube S4; the drain electrode of the first switch tube S1 is connected with the source electrode of the second switch tube S2, the source electrode of the fifth switch tube S5 and the source electrode of the seventh switch tube S7; the drain electrode of the second switch tube S2 is connected with the source electrode of the third switch tube S3; the drain electrode of the fifth switch tube S5 is connected with the source electrode of a sixth switch tube S6; the drain electrode of the seventh switch tube S7 is connected with the source electrode of the eighth switch tube S8; and the source electrode of the fourth switch tube S4 is connected with the drain electrode of the third switch tube S3, the drain electrode of the sixth switch tube S.6 and the drain electrode of the eighth switch tube S8. The converter provided by the utility model is simple in topological structure, and less equipment is provided for providing two three-phase loads compared with two independent ANPC converters.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to a three-level dual-output active neutral point clamp converter. Background Technology

[0002] In the fields of new energy power generation and power transmission, ANPC (Advanced Neutral Point Clamped) converters, as an advanced topology, effectively improve system efficiency and reliability by optimizing voltage stress distribution and reducing switching losses, becoming an important solution to overcome the limitations of traditional designs and widely used in high-performance power systems. However, existing ANPC converters still suffer from problems such as numerous load devices and uneven output voltage and current.

[0003] Chinese Patent Publication No. CN216531106U, entitled "An Active Neutral Point Clamped Inverter," describes a patent application for an active neutral point clamped inverter. The application includes an input terminal and an output terminal, comprising an inductor L, a first capacitor C1, a second capacitor C2, and seven switches. At the input terminal, a DC power supply Vdc is connected in series with the inductor L and then in parallel with the first switch S1. One end of the second switch S2 and the third switch S3 are connected to the upper and lower terminals of the first switch S1, respectively, and the other end is connected to the upper and lower terminals of the first capacitor C1. One end of the fourth switch S4 and the fifth switch S5 are connected to the upper and lower terminals of the first capacitor C1, respectively, and the other end is directly connected. One end of the sixth switch S6 and the seventh switch S7 is directly connected to the direct connection point of the fourth switch S4 and the fifth switch S5. The other end of the sixth switch S6 and the seventh switch S7 is connected to the positive and negative terminals of the second capacitor C2, respectively. The output terminal is led out from between the second capacitor C2 and the seventh switch S7. This patent application can improve the DC link voltage utilization rate, but it cannot solve the problems of structural simplification and output smoothing in a dual-output three-phase converter. Utility Model Content

[0004] In order to overcome the problems existing in the prior art, the purpose of this utility model is to provide a three-level dual-output active neutral point clamping converter. In view of the problems existing in the prior art, this utility model provides a three-level dual-output active neutral point clamping converter to solve the problem of DC link capacitor voltage balance in related technologies.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A three-level dual-output active neutral point clamping converter includes: an input source Vdc, a first capacitor C1, a second capacitor C2, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, and an eighth switch S8; the positive terminal of the input source Vdc is connected to the first terminal of the first capacitor C1 and the source of the first switch S1, and the negative terminal is connected to the second terminal of the second capacitor C2 and the drain of the fourth switch S4; the second terminal of the first capacitor C1 is connected to the first terminal of the second capacitor C2; the drain of the first switch S1 is connected to the source of the second switch S2. The source of the fifth switch S5 and the source of the seventh switch S7 are connected; the drain of the second switch S2 is connected to the source of the third switch S3; the drain of the fifth switch S5 is connected to the source of the sixth switch S6; the drain of the seventh switch S7 is connected to the source of the eighth switch S8; the source of the fourth switch S4 is connected to the drain of the third switch S3, the drain of the sixth switch S6, and the drain of the eighth switch S8; the drain of the fifth switch S5 is connected to a first load, and the drain of the sixth switch S6 is connected to the first load; the source of the seventh switch S7 is connected to a second load, and the drain of the eighth switch S8 is connected to the second load.

[0007] Optionally, the source of the second switch S2 is grounded.

[0008] Optionally, the drain of the third switch S3 is grounded.

[0009] Optionally, both the first load and the second load are grounded.

[0010] Optionally, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are all switches with the same duty cycle.

[0011] Optionally, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7 and the eighth switch S8 are all MOSFETs.

[0012] Optionally, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7 and the eighth switch S8 are STP7NK40Z type MOSFETs.

[0013] Optionally, both the first capacitor C1 and the second capacitor C2 are electrolytic capacitors.

[0014] Optionally, the metal foil of the electrolytic capacitor in the first capacitor C1 and the second capacitor C2 is the positive electrode, and the negative electrode of the electrolytic capacitor is a conductive material and an electrolyte.

[0015] Optionally, the positive electrode of the electrolytic capacitors of the first capacitor C1 and the second capacitor C2 is coated with an electrolyte.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention provides a three-level dual-output active neutral point clamped converter. Compared with other dual-output three-phase converters, this invention has smaller cost and size, significantly improved operating boundary area, lower conduction loss, and real-time application capability. The DC bus voltage is balanced in all different operating modes, providing smooth output voltage and current.

[0018] The converter of this invention operates with two separate loads at different frequencies and a common frequency, and has different modulation indices and phase shifts to ensure converter performance. The converter topology of this invention is simple and requires fewer devices than two separate ANPC converters providing two three-phase loads. 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 three-level dual-output active neutral point clamping converter based on this utility model.

[0021] Figure 2 This is a schematic diagram of the first working state of the three-level dual-output active neutral point clamping converter of this utility model.

[0022] Figure 3 This is a schematic diagram of the second working state of the three-level dual-output active neutral point clamping converter of this utility model.

[0023] Figure 4 This is a schematic diagram of the third working state of the three-level dual-output active neutral point clamping converter of this utility model. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] A three-level dual-output active neutral point clamping converter includes: an input source Vdc, a first capacitor C1, a second capacitor C2, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, and an eighth switch S8; the positive terminal of the input source Vdc is connected to the first terminal of the first capacitor C1 and the source of the first switch S1, and the negative terminal is connected to the second terminal of the second capacitor C2 and the drain of the fourth switch S4; the second terminal of the first capacitor C1 is connected to the first terminal of the second capacitor C2; the drain of the first switch S1 is connected to the source of the second switch S2. The source of the fifth switch S5 and the source of the seventh switch S7 are connected; the drain of the second switch S2 is connected to the source of the third switch S3; the drain of the fifth switch S5 is connected to the source of the sixth switch S6; the drain of the seventh switch S7 is connected to the source of the eighth switch S8; the source of the fourth switch S4 is connected to the drain of the third switch S3, the drain of the sixth switch S6, and the drain of the eighth switch S8; the drain of the fifth switch S5 is connected to a first load, and the drain of the sixth switch S6 is connected to the first load; the source of the seventh switch S7 is connected to a second load, and the drain of the eighth switch S8 is connected to the second load.

[0032] The converter of this invention operates with two separate loads at different frequencies and a common frequency, and has different modulation indices and phase shifts to ensure converter performance. The converter topology of this invention is simple and requires fewer devices than two separate ANPC converters providing two three-phase loads.

[0033] Example 1

[0034] like Figure 1As shown, this embodiment discloses a three-level dual-output active neutral point clamp converter, including an input source Vdc. The positive terminal of the input source Vdc is connected to one end of a first capacitor C1 and the source of a first switch S1, and the negative terminal is connected to one end of a second capacitor C2 and the drain of a fourth switch S4. The first capacitor C1 and the second capacitor C2 are connected in series. The drain of the first switch S1 is connected to the sources of the second switch S2, the fifth switch S5, and the seventh switch S7. The drain of the second switch S2 is connected to the source of the third switch S3, the drain of the fifth switch S5 is connected to the source of the sixth switch S6, and the drain of the seventh switch S7 is connected to the source of the eighth switch S8. The drains of the third switch S3, the sixth switch S6, and the eighth switch S8 are connected to the source of the fourth switch S4. The drain of the second switch S2 is grounded, the drain of the fifth switch S5 is connected to the load and grounded, and the drain of the seventh switch S7 is connected to the load and grounded.

[0035] Preferably, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are MOSFETs with the same duty cycle. The combination of eight MOSFETs with the same duty cycle reduces the number of devices required to generate high voltage gain by combining the switches and switched capacitors. It also has the advantages of fewer devices and a switched capacitor structure, which significantly improves the operating boundary area. Compared with similar converters, it has lower input ripple and voltage stress, and improves overall operating efficiency.

[0036] Specifically, in this embodiment, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 all use STP7NK40Z MOSFETs. It should be noted that the STP7NK40Z MOSFET has a withstand voltage of 400V, excellent high-voltage withstand capability, and is commonly used in power converters, inverters, and lighting drivers. At 25°C, the maximum continuous drain current is 6.5A, and the maximum pulse current is 26A. The power consumption is 75W, and the operating temperature range is from -55°C to 150°C. The maximum gate voltage is ±30V, and the on-resistance is 1.3Ω. It features high reliability, a built-in Zener diode to protect the gate from overvoltage damage, high efficiency, moderate on-resistance, suitability for medium-power applications, and reduced power loss. It also uses a TO-220 package, providing excellent heat dissipation.

[0037] Preferably, both the first capacitor C1 and the second capacitor C2 are electrolytic capacitors; the metal foil of the electrolytic capacitor is the positive electrode, and the electrolyte is attached to the positive electrode; the negative electrode of the electrolytic capacitor includes a conductive material and the electrolyte; when the electrolytic capacitor is connected to a power source, electrons on the positive electrode will flow from the power source into the electrolyte, forming an electron flow. This electron flow will further cause cations in the solution to move towards the negative electrode, while anions move towards the positive electrode. This ion migration enables the electrolytic capacitor to store and release charge.

[0038] The electrolytic capacitor can provide a stable DC voltage for the converter, reduce bus voltage ripple, and ensure voltage stability. In the ANPC topology, the active switch regulates the neutral point potential, and the electrolytic capacitor can act as an energy storage element to assist in dynamic adjustment. In the dual-output structure, the use of electrolytic capacitors helps to stabilize the voltage at each output terminal and reduce the impact of load changes.

[0039] Example 2

[0040] This embodiment discloses a three-level dual-output active neutral point clamping converter, which includes the following operating modes:

[0041] First working mode:

[0042] like Figure 2 As shown, in this operating mode, switches S2, S4, S5, and S8 are all in the on state, and current flows between the DC bus and the load. The first capacitors C1 and C2 divide the DC power supply Vdc, storing energy at voltages VC1 = VC2 = Vdc / 2, and providing current support for different paths. When switches S2 and S5 are on, one end of the load is grounded through S2 and S5 via the neutral point, and the other end is directly grounded, resulting in Vx1 being 0. When the fourth switch S4 and S8 are on, one end of the load is connected to one end of the second capacitor C2 through S4 and S8, and the other end is directly grounded, resulting in Vx2 being -Vdc / 2. During this stage, the blocking voltage of switches S1, S3, S6, and S7 is Vdc / 2, the first capacitor C1 maintains its previous voltage, and the second capacitor C2 is charged.

[0043] The second working mode:

[0044] like Figure 3As shown, in this operating mode, switches S1, S3, S5, and S8 are all in the on state, and current flows between the DC bus and the load. The first capacitors C1 and C2 divide the DC power supply Vdc, storing energy at voltages VC1 = VC2 = Vdc / 2, and providing current support for different paths. When switches S1 and S5 are on, one end of the load is connected to one end of the first capacitor C1 through S1 and S5, and the other end is directly grounded, with Vx1 being Vdc / 2. When switches S3 and S8 are on, one end of the load is grounded through S3 and S8 via the neutral point, and the other end is directly grounded, with Vx2 being 0. During this stage, the voltage stress on switches S2, S4, S6, and S7 is Vdc / 2, the first capacitor C1 discharges, and the second capacitor C2 maintains its previous voltage in this state.

[0045] The third working mode:

[0046] like Figure 4 As shown, in this operating mode, switches S1, S4, S5, and S8 are all in the on state, and current flows between the DC bus and the load. The first capacitors C1 and C2 divide the DC power supply Vdc, storing energy at voltages VC1 = VC2 = Vdc / 2, and providing current support for different paths. When switches S1 and S5 are on, one end of the load is connected to one end of the first capacitor C1 through S1 and S5, and the other end is directly grounded, with Vx1 being Vdc / 2. When the fourth switch S4 and S8 are on, one end of the load is connected to one end of the second capacitor C2 through S4 and S8, and the other end is directly grounded, with Vx2 being -Vdc / 2. During this stage, the voltage stresses of switches S2, S3, S6, and S7 are Vdc / 2, Vdc / 2, Vdc, and Vdc, respectively; the first capacitor C1 discharges, and the second capacitor C2 charges.

[0047] In summary, by cooperating with different switching transistors, power can be supplied to the load, achieving better performance with fewer components.

[0048] This practical three-level dual-output active neutral point clamp converter has good performance while using fewer components and a simple topology, which significantly improves the operating boundary area. This compact structure can provide two three-phase loads or a six-phase machine, and still has high operating efficiency even without considering the phase shift / difference between its two three-phase groups. Among similar devices, it has less input current ripple and voltage stress on the power switch and is less expensive.

[0049] 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.

[0050] 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 three-level dual-output active neutral point clamped converter, characterized in that, The application relates to a switching power supply circuit. The application relates to a switching power supply circuit.

2. A three-level dual-output active neutral point clamped converter according to claim 1, characterized in that, The application relates to a switching power supply circuit.

3. A three-level dual-output active neutral point clamped converter according to claim 1, characterized in that, The application relates to a switching power supply circuit.

4. The three-level dual-output active neutral point clamped converter of claim 1, wherein, The application relates to a switching power supply circuit.

5. The three-level dual-output active neutral point clamped converter of claim 1, wherein, The application relates to a switching power supply circuit.

6. A three-level dual-output active neutral point clamped converter according to claim 1, characterized in that, The application relates to a switching power supply circuit.

7. A three-level dual-output active neutral point clamped converter according to claim 6, characterized in that, The application relates to a switching power supply circuit.

8. The three-level dual-output active neutral point clamped converter of claim 1, wherein, The application relates to a switching power supply circuit.

9. A three-level dual-output active neutral point clamped converter according to claim 8, characterized in that, The application relates to a switching power supply circuit.

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