Three-phase hybrid clamping type three-level inverter with wide voltage output range
By designing a three-phase hybrid clamped three-level inverter consisting of a DC voltage source, a Y-type inverter module and a hybrid clamping module, the problems of poor waveform quality and limited voltage output range of traditional inverters are solved, and a higher voltage output range and waveform quality are achieved.
Patent Information
- Application Number
- CN202422727601.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Traditional three-phase inverters cannot achieve high waveform quality and a wide voltage output range, and there are problems such as overvoltage of devices on the inner side of the bridge arm, unbalanced blocking voltage of the power switch, and difficulty in quickly recovering the reverse voltage of the clamping diode.
A three-phase hybrid clamped three-level inverter with a wide voltage output range is adopted, including a DC voltage source module, a Y-type inverter module, a hybrid clamping module and a MOSFET control module. Through different connection methods and the addition of a hybrid clamping module, a wide voltage output range and high waveform quality are achieved.
It achieves a wider range of voltage output, higher switching frequency and higher voltage resistance level, improves waveform quality and solves the shortcomings of traditional inverters.
Smart Images
Figure CN223364050U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of multi-level inverters, in particular to a three-phase hybrid clamped three-level inverter with a wide voltage output range. Background Art
[0002] With the widespread application of new energy sources, power electronics technology has also flourished, with inverters being a key research area. An inverter is a device that converts direct current (DC) to alternating current (AC) based on power electronic switching devices. Currently, the more commonly used three-phase inverter types include voltage source inverters (VSIs), current source inverters (CSIs), and PWM inverters. In inverter applications, due to the particularly high requirements for the motor drive provided by fuel cells, the inverter must cope with the wide DC voltage variations of the fuel cells powering the motor drive while also outputting high-quality motor voltage. Traditional three-phase full-bridge inverters suffer from poor output waveform quality and low switching frequency, while traditional clamp-type inverters suffer from overvoltages on the inner components of the bridge arms, uneven blocking voltages on the power switches, and difficulty in quickly recovering from the reverse voltage of the clamping diodes.
[0003] In order to solve the above problems, the present invention proposes a three-phase hybrid clamped three-level inverter with a wide voltage output range. Summary of the Invention
[0004] The purpose of the utility model is to propose a three-phase hybrid clamped three-level inverter with a wide voltage output range, so as to solve the problem that traditional inverters cannot achieve high waveform quality and a wide voltage output range.
[0005] The technical solution adopted by the utility model is: a three-phase hybrid clamped three-level inverter with a wide voltage output range, comprising a DC voltage source module, a Y-type inverter module, a hybrid clamping module, a MOSFET control module, and a three-phase load module; characterized in that the output of the DC voltage source module is connected to the input of the Y-type inverter module, the hybrid clamping module is connected to the Y-type inverter module, the output of the MOSFET control module is connected to the input of the Y-type inverter module, and the output of the Y-type inverter module is connected to the input of the three-phase load module; the DC voltage source module comprises a voltage source Vdc1, a voltage source Vdc2, a capacitor C i, ground port GND1; the Y-type inverter module includes a crystal switch tube T1, a crystal switch tube T2, a crystal switch tube T3, a crystal switch tube T4, a crystal switch tube T5, a crystal switch tube T6, a crystal switch tube T7, a crystal switch tube T8, a crystal switch tube T9, a crystal switch tube T10, a crystal switch tube T11, a crystal switch tube T12, a crystal switch tube T13, a crystal switch tube T14, a crystal switch tube T15, a crystal switch tube T16, a crystal switch tube T17, a crystal switch tube T18, a crystal switch tube T19, a crystal switch tube T20, a crystal switch tube T21, a crystal switch tube T22, a crystal switch tube T23, a crystal switch tube T24, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D 12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, capacitor C9, capacitor C10, capacitor C11; the hybrid clamp module includes diode D25, diode D26, diode D27, diode D28, diode D29, diode D30, diode D31, diode D32, diode D33, diode D34, diode D35, diode D36, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L4, inductor L5, inductor L6.
[0006] In the DC voltage source module, the voltage source Vdc1 and the voltage source Vdc2 are two identical DC voltage sources, the amplitude of which is Vdc / 2, and the positive electrode of the voltage source Vdc1 is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the drain of transistor switch tube T1, the negative electrode is connected to the positive electrode of voltage source Vdc2 and ground port GND1, the negative electrode of voltage source Vdc2 is connected to capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the source electrode of transistor switch tube T4.
[0007] The MOSFET control module outputs 24 control signals, and the output interfaces are MOS transistor T1, MOS transistor T2, MOS transistor T3, MOS transistor T4, MOS transistor T5, MOS transistor T6, MOS transistor T7, MOS transistor T8, MOS transistor T9, MOS transistor T10, MOS transistor T11, MOS transistor T12, MOS transistor T13, MOS transistor T14, MOS transistor T15, MOS transistor T16, MOS transistor T17, MOS transistor T18, MOS transistor T19, MOS transistor T20, MOS transistor T21, MOS transistor T22, MOS transistor T23, and MOS transistor T24.
[0008] In the Y-type inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the drain is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D1, the source is connected to the drain of transistor switch tube T2, the anode of diode D1 and the positive electrode of capacitor C3, the gate of transistor switch tube T2 is connected to the T2 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T1, the cathode of diode D2 and the positive electrode of capacitor C3, the source is connected to the drain of transistor switch tube T3, the anode of diode D2 and the positive electrode of inductor L1, the gate of transistor switch tube T3 is connected to the T3 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T2, the cathode of diode D3 and the positive electrode of inductor L1, the source is connected to the drain of transistor switch tube T4, the anode of diode D3 and the negative electrode of capacitor C3, the gate of transistor switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T3, the anode of diode D3 and the negative electrode of capacitor C3, the source is connected to the i The cathode is connected to the cathode of capacitor C2 and the anode of diode D4, the gate of transistor switch tube T5 is connected to the T5 output interface of MOSFET control module, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D5, the source is connected to the drain of transistor switch tube T6, the anode of diode D5 and the positive electrode of capacitor C4, the gate of transistor switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T5, the cathode of diode D6 and the positive electrode of capacitor C4, the source is connected to the drain of transistor switch tube T7, the anode of diode D6 and the positive electrode of inductor L5, the gate of transistor switch tube T7 is connected to the T7 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T6, the cathode of diode D7 and the positive electrode of inductor L2, the source is connected to the drain of transistor switch tube T8, the anode of diode D7 and the negative electrode of capacitor C4, the gate of transistor switch tube T8 is connected to the T8 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T7, the anode of diode D8 and the negative electrode of capacitor C4, the source is connected to the capacitor C iThe cathode is connected to the cathode of capacitor C2 and the anode of diode D8, the gate of transistor switch tube T9 is connected to the output interface of MOSFET control module T9, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D9, the source is connected to the drain of transistor T10, the anode of diode D9 and the positive electrode of capacitor C5, the gate of transistor T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the source of transistor T9, the cathode of diode D10 and the positive electrode of capacitor C5, the source is connected to the drain of transistor T11, the anode of diode D10 and the positive electrode of inductor L3, the gate of transistor T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the source of transistor T10, the cathode of diode D11 and the positive electrode of inductor L3, the source is connected to the drain of transistor T12, the anode of diode D11 and the negative electrode of capacitor C5, the gate of transistor T12 is connected to the T12 output interface of the MOSFET control module, the drain is connected to the source of transistor T11, the anode of diode D12 and the negative electrode of capacitor C5, and the source is connected to the capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the anode of diode D12, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the cathode of diode D13 and the positive electrode of capacitor C9 and the positive electrode of resistor R1, the source is connected to the drain of crystal switch tube T14 and the anode of diode D13 and the positive electrode of capacitor C6, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the drain is connected to the source of crystal switch tube T13 and the cathode of diode D14 and the positive electrode of capacitor C6, the source is connected to the drain of crystal switch tube T15 and diode D The anode of transistor T14 is connected to the negative electrode of inductor L1, the gate of transistor T15 is connected to the output interface of T15 of MOSFET control module, the drain is connected to the source of transistor T14, the cathode of diode D15 and the negative electrode of inductor L1, the source is connected to the drain of transistor T16, the anode of diode D15 and the negative electrode of capacitor C6, the gate of transistor T16 is connected to the output interface of T16 of MOSFET control module, the drain is connected to the source of transistor T15, the cathode of diode D16 and the negative electrode of capacitor C6, the source is connected to the anode of diode D16 and the negative electrode of capacitor C2 and the negative electrode of capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T17 is connected to the T17 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D17 and the positive electrode of the capacitor C10 and the positive electrode of the resistor R2, the source is connected to the drain of the transistor switch tube T18 and the anode of the diode D17 and the positive electrode of the capacitor C7, the gate of the transistor switch tube T18 is connected to the T18 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T17 and the cathode of the diode D18 and the positive electrode of the capacitor C7, the source is connected to the drain of the transistor switch tube T19 and the anode of the diode D18 and the inductor L 2, the gate of the transistor switch tube T19 is connected to the T19 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T18, the cathode of the diode D19 and the negative electrode of the inductor L2, the source is connected to the drain of the transistor switch tube T20, the anode of the diode D19 and the negative electrode of the capacitor C7, the gate of the transistor switch tube T20 is connected to the T20 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T19, the cathode of the diode D20 and the negative electrode of the capacitor C7, the source is connected to the anode of the diode D20, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T21 is connected to the T21 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D21, the positive electrode of the capacitor C11 and the positive electrode of the resistor R3, the source is connected to the drain of the transistor switch tube T22, the anode of the diode D21 and the positive electrode of the capacitor C8, the gate of the transistor switch tube T22 is connected to the T22 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T21, the cathode of the diode D22 and the positive electrode of the capacitor C8, the source is connected to the drain of the transistor switch tube T23, the anode of the diode D22 and the inductor L 3 is connected to the negative electrode, the gate of the transistor switch tube T23 is connected to the T23 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T22, the cathode of the diode D23 and the negative electrode of the inductor L3, the source is connected to the drain of the transistor switch tube T24, the anode of the diode D23 and the negative electrode of the capacitor C8, the gate of the transistor switch tube T24 is connected to the T24 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T23, the cathode of the diode D24 and the negative electrode of the capacitor C8, the source is connected to the anode of the diode D24, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i Negative pole connected.
[0009] In the hybrid clamping module, the cathode of the diode D25 is connected to the positive electrode of the capacitor C3, and the anode is connected to the cathode of the diode D26 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D26 is connected to the anode of the diode D25 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C3. The cathode of the diode D27 is connected to the positive electrode of the capacitor C4, and the anode is connected to the cathode of the diode D28 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D28 is connected to the anode of the diode D27 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C4. The cathode of the diode D29 is connected to the positive electrode of the capacitor C5, and the anode is connected to the cathode of the diode D30 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D30 is connected to the anode of the diode D29 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C5. , the cathode of diode D31 is connected to the positive electrode of capacitor C6, and its anode is connected to the cathode of diode D32, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D32 is connected to the anode of diode D31, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C6. The cathode of diode D33 is connected to the positive electrode of capacitor C7, and its anode is connected to the cathode of diode D34, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D34 is connected to the anode of diode D33, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C7. The cathode of diode D35 is connected to the positive electrode of capacitor C8, and its anode is connected to the cathode of diode D36, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D36 is connected to the anode of diode D35, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C8. The positive electrode of capacitor C1 is connected to capacitor C i The positive electrode is connected to the negative electrode of capacitor C2 and the capacitor C i Negative pole connected.
[0010] In the three-phase load module, the positive electrode of the resistor R1 is connected to the positive electrode of the capacitor C9, and the negative electrode is connected to the positive electrode of the inductor L4; the positive electrode of the resistor R2 is connected to the positive electrode of the capacitor C10, and the negative electrode is connected to the positive electrode of the inductor L5; the positive electrode of the resistor R3 is connected to the positive electrode of the capacitor C11, and the negative electrode is connected to the positive electrode of the inductor L6; the negative electrode of the inductor L4, the negative electrode of the inductor L5, and the negative electrode of the inductor L6 adopt a star-shaped connection method with an ungrounded neutral point.
[0011] The advantages of this utility model's three-phase hybrid clamped three-level inverter with a wide voltage output range are as follows: First, the inverter bridge utilizes a different connection method than traditional inverters, connecting three identical DC / DC converters to a common "Y" point. Second, a hybrid clamping module is added to the inverter bridge switch, enabling the inverter described in this utility model to achieve AC voltage output with a wide voltage output range and high waveform quality. Compared to traditional three-phase voltage-type bridge inverter circuits, this utility model's three-phase hybrid clamped three-level inverter with a wide voltage output range offers a wider voltage output range, higher switching frequency, higher voltage resistance, and higher waveform quality.
[0012] In order to more clearly illustrate the three-phase hybrid clamped three-level inverter with a wide voltage output range proposed by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the three-phase hybrid clamped three-level inverter with a wide voltage output range proposed by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0014] Figure 1 This is a circuit structure diagram of a three-phase hybrid clamped three-level inverter with a wide voltage output range according to the present invention.
[0015] Figure 2 It is the buck-boost module of phase A in the inverter.
[0016] Figure 3 This is the buck operating mode when the output voltage is lower than the input voltage.
[0017] Figure 4 It is the boost working mode when the output voltage is higher than the input voltage.
[0018] Figure 5 This is the clamp capacitor charging circuit when the inverter outputs Vdc / 2 in operating mode 1.
[0019] Figure 6 This is the clamping capacitor discharge circuit when the inverter outputs Vdc / 2 in operating mode 1.
[0020] Figure 7 This is the clamping capacitor charging circuit when the inverter outputs zero voltage in operating mode 2.
[0021] Figure 8 This is the clamping capacitor discharge circuit when the inverter outputs zero voltage in operating mode 2.
[0022] Figure 9This is the clamping capacitor charging circuit when the inverter outputs zero voltage in operating mode 3.
[0023] Figure 10 This is the clamp capacitor charging circuit when the inverter outputs -Vdc / 2 in operating mode 4. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It should be noted that the embodiments described here are only some embodiments of the present invention, rather than all implementation methods of the present invention, and the embodiments are only exemplary.
[0025] Figure 1 The utility model is a circuit structure diagram of a three-phase hybrid clamped three-level inverter with a wide voltage output range. Its specific structure is as follows: it includes a DC voltage source module, a Y-type inverter module, a hybrid clamp module, a MOSFET control module, and a three-phase load module; it is characterized in that the output of the DC voltage source module is connected to the input of the Y-type inverter module, the hybrid clamp module is connected to the Y-type inverter module, the output of the MOSFET control module is connected to the input of the Y-type inverter module, and the output of the Y-type inverter module is connected to the input of the three-phase load module; the DC voltage source module includes a voltage source Vdc1, a voltage source Vdc2, a capacitor C i, ground port GND1; the Y-type inverter module includes a crystal switch tube T1, a crystal switch tube T2, a crystal switch tube T3, a crystal switch tube T4, a crystal switch tube T5, a crystal switch tube T6, a crystal switch tube T7, a crystal switch tube T8, a crystal switch tube T9, a crystal switch tube T10, a crystal switch tube T11, a crystal switch tube T12, a crystal switch tube T13, a crystal switch tube T14, a crystal switch tube T15, a crystal switch tube T16, a crystal switch tube T17, a crystal switch tube T18, a crystal switch tube T19, a crystal switch tube T20, a crystal switch tube T21, a crystal switch tube T22, a crystal switch tube T23, a crystal switch tube T24, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D 12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, capacitor C9, capacitor C10, capacitor C11; the hybrid clamp module includes diode D25, diode D26, diode D27, diode D28, diode D29, diode D30, diode D31, diode D32, diode D33, diode D34, diode D35, diode D36, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L4, inductor L5, inductor L6.
[0026] In the DC voltage source module, the voltage source Vdc1 and the voltage source Vdc2 are two identical DC voltage sources, the amplitude of which is Vdc / 2, and the positive electrode of the voltage source Vdc1 is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the drain of transistor switch tube T1, the negative electrode is connected to the positive electrode of voltage source Vdc2 and ground port GND1, the negative electrode of voltage source Vdc2 is connected to capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the source electrode of transistor switch tube T4.
[0027] The MOSFET control module outputs 24 control signals, and the output interfaces are MOS transistor T1, MOS transistor T2, MOS transistor T3, MOS transistor T4, MOS transistor T5, MOS transistor T6, MOS transistor T7, MOS transistor T8, MOS transistor T9, MOS transistor T10, MOS transistor T11, MOS transistor T12, MOS transistor T13, MOS transistor T14, MOS transistor T15, MOS transistor T16, MOS transistor T17, MOS transistor T18, MOS transistor T19, MOS transistor T20, MOS transistor T21, MOS transistor T22, MOS transistor T23, and MOS transistor T24.
[0028] In the Y-type inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the drain is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D1, the source is connected to the drain of transistor switch tube T2, the anode of diode D1 and the positive electrode of capacitor C3, the gate of transistor switch tube T2 is connected to the T2 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T1, the cathode of diode D2 and the positive electrode of capacitor C3, the source is connected to the drain of transistor switch tube T3, the anode of diode D2 and the positive electrode of inductor L1, the gate of transistor switch tube T3 is connected to the T3 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T2, the cathode of diode D3 and the positive electrode of inductor L1, the source is connected to the drain of transistor switch tube T4, the anode of diode D3 and the negative electrode of capacitor C3, the gate of transistor switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T3, the anode of diode D3 and the negative electrode of capacitor C3, the source is connected to the i The cathode is connected to the cathode of capacitor C2 and the anode of diode D4, the gate of transistor switch tube T5 is connected to the T5 output interface of MOSFET control module, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D5, the source is connected to the drain of transistor switch tube T6, the anode of diode D5 and the positive electrode of capacitor C4, the gate of transistor switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T5, the cathode of diode D6 and the positive electrode of capacitor C4, the source is connected to the drain of transistor switch tube T7, the anode of diode D6 and the positive electrode of inductor L5, the gate of transistor switch tube T7 is connected to the T7 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T6, the cathode of diode D7 and the positive electrode of inductor L2, the source is connected to the drain of transistor switch tube T8, the anode of diode D7 and the negative electrode of capacitor C4, the gate of transistor switch tube T8 is connected to the T8 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T7, the anode of diode D8 and the negative electrode of capacitor C4, the source is connected to the capacitor C iThe cathode is connected to the cathode of capacitor C2 and the anode of diode D8, the gate of transistor switch tube T9 is connected to the output interface of MOSFET control module T9, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D9, the source is connected to the drain of transistor T10, the anode of diode D9 and the positive electrode of capacitor C5, the gate of transistor T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the source of transistor T9, the cathode of diode D10 and the positive electrode of capacitor C5, the source is connected to the drain of transistor T11, the anode of diode D10 and the positive electrode of inductor L3, the gate of transistor T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the source of transistor T10, the cathode of diode D11 and the positive electrode of inductor L3, the source is connected to the drain of transistor T12, the anode of diode D11 and the negative electrode of capacitor C5, the gate of transistor T12 is connected to the T12 output interface of the MOSFET control module, the drain is connected to the source of transistor T11, the anode of diode D12 and the negative electrode of capacitor C5, and the source is connected to the capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the anode of diode D12, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the cathode of diode D13 and the positive electrode of capacitor C9 and the positive electrode of resistor R1, the source is connected to the drain of crystal switch tube T14 and the anode of diode D13 and the positive electrode of capacitor C6, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the drain is connected to the source of crystal switch tube T13 and the cathode of diode D14 and the positive electrode of capacitor C6, the source is connected to the drain of crystal switch tube T15 and diode D The anode of transistor T14 is connected to the negative electrode of inductor L1, the gate of transistor T15 is connected to the output interface of T15 of MOSFET control module, the drain is connected to the source of transistor T14, the cathode of diode D15 and the negative electrode of inductor L1, the source is connected to the drain of transistor T16, the anode of diode D15 and the negative electrode of capacitor C6, the gate of transistor T16 is connected to the output interface of T16 of MOSFET control module, the drain is connected to the source of transistor T15, the cathode of diode D16 and the negative electrode of capacitor C6, the source is connected to the anode of diode D16 and the negative electrode of capacitor C2 and the negative electrode of capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T17 is connected to the T17 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D17 and the positive electrode of the capacitor C10 and the positive electrode of the resistor R2, the source is connected to the drain of the transistor switch tube T18 and the anode of the diode D17 and the positive electrode of the capacitor C7, the gate of the transistor switch tube T18 is connected to the T18 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T17 and the cathode of the diode D18 and the positive electrode of the capacitor C7, the source is connected to the drain of the transistor switch tube T19 and the anode of the diode D18 and the inductor L 2, the gate of the transistor switch tube T19 is connected to the T19 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T18, the cathode of the diode D19 and the negative electrode of the inductor L2, the source is connected to the drain of the transistor switch tube T20, the anode of the diode D19 and the negative electrode of the capacitor C7, the gate of the transistor switch tube T20 is connected to the T20 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T19, the cathode of the diode D20 and the negative electrode of the capacitor C7, the source is connected to the anode of the diode D20, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T21 is connected to the T21 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D21, the positive electrode of the capacitor C11 and the positive electrode of the resistor R3, the source is connected to the drain of the transistor switch tube T22, the anode of the diode D21 and the positive electrode of the capacitor C8, the gate of the transistor switch tube T22 is connected to the T22 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T21, the cathode of the diode D22 and the positive electrode of the capacitor C8, the source is connected to the drain of the transistor switch tube T23, the anode of the diode D22 and the inductor L 3 is connected to the negative electrode, the gate of the transistor switch tube T23 is connected to the T23 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T22, the cathode of the diode D23 and the negative electrode of the inductor L3, the source is connected to the drain of the transistor switch tube T24, the anode of the diode D23 and the negative electrode of the capacitor C8, the gate of the transistor switch tube T24 is connected to the T24 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T23, the cathode of the diode D24 and the negative electrode of the capacitor C8, the source is connected to the anode of the diode D24, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i Negative pole connected.
[0029] In the hybrid clamping module, the cathode of the diode D25 is connected to the positive electrode of the capacitor C3, and the anode is connected to the cathode of the diode D26 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D26 is connected to the anode of the diode D25 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C3. The cathode of the diode D27 is connected to the positive electrode of the capacitor C4, and the anode is connected to the cathode of the diode D28 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D28 is connected to the anode of the diode D27 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C4. The cathode of the diode D29 is connected to the positive electrode of the capacitor C5, and the anode is connected to the cathode of the diode D30 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D30 is connected to the anode of the diode D29 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C5. , the cathode of diode D31 is connected to the positive electrode of capacitor C6, and its anode is connected to the cathode of diode D32, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D32 is connected to the anode of diode D31, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C6. The cathode of diode D33 is connected to the positive electrode of capacitor C7, and its anode is connected to the cathode of diode D34, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D34 is connected to the anode of diode D33, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C7. The cathode of diode D35 is connected to the positive electrode of capacitor C8, and its anode is connected to the cathode of diode D36, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D36 is connected to the anode of diode D35, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C8. The positive electrode of capacitor C1 is connected to capacitor C i The positive electrode is connected to the negative electrode of capacitor C2 and the capacitor C i Negative pole connected.
[0030] In the three-phase load module, the positive electrode of the resistor R1 is connected to the positive electrode of the capacitor C9, and the negative electrode is connected to the positive electrode of the inductor L4; the positive electrode of the resistor R2 is connected to the positive electrode of the capacitor C10, and the negative electrode is connected to the positive electrode of the inductor L5; the positive electrode of the resistor R3 is connected to the positive electrode of the capacitor C11, and the negative electrode is connected to the positive electrode of the inductor L6; the negative electrode of the inductor L4, the negative electrode of the inductor L5, and the negative electrode of the inductor L6 adopt a star-shaped connection method with an ungrounded neutral point.
[0031] Next, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The Y-type inverter bridge structure used in this utility model differs from the traditional IGBT three-phase fully controlled bridge voltage source inverter in that this utility model adds 18 sets of MOSFET transistors and 24 sets of corresponding freewheeling diodes to the inverter bridge, achieving a wide voltage output range while also realizing three-phase three-level output. The Y-type inverter bridge part is composed of three buck-boost modules. Figure 2 For the buck-boost module of phase a, the control strategies of the six modules are independent of each other, which means that the control strategy of the three phases is relatively simple. Taking the voltage of phase a as an example, the transistors T13 and T14 are kept on continuously, the transistors T15 and T16 are kept off continuously, and the transistors T1, T2, T3, and T4 are turned on alternately to obtain Figure 3 At this time, the a-phase buck-boost module is in buck mode, and the output voltage is lower than the input voltage; transistors T1 and T2 are kept on continuously, transistors T3 and T4 are kept off continuously, and transistors T13, T14, T15, and T16 are turned on alternately to obtain Figure 4 At this point, the buck-boost module on phase A is in boost mode, with the output voltage higher than the input voltage. The on / off principles for the remaining two phases are similar. In this way, the three-phase AC power passes through the buck-boost module of the Y-type inverter, outputting AC power with a wide voltage range.
[0032] Then, please refer to Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 In the above-mentioned inverter process, taking the buck mode of the A-phase inverter process as an example, the output voltage is lower than the input voltage. Figure 5 、 Figure 6 In working mode 1, transistors T1 and T2 are continuously turned on, while transistors T3 and T4 are continuously turned off. The output voltage is Vdc / 2. Due to the conduction of transistors T1 and T2 and the AC circuit formed by diodes D1 and D2, a bidirectional loop for the load current is formed. When the voltage on the clamping capacitor C3 is lower than zero, Figure 5 The dotted current loop shown in the figure is charged to zero. When the voltage of the clamping capacitor is greater than zero, Figure 6 The dashed current loop shown is discharged to zero by the load current. Figure 7 、 Figure 8 In working mode 2, transistors T2 and T4 are continuously turned on, transistors T1 and T3 are continuously turned off, and the output voltage is zero. A bidirectional flow loop of the load current is formed through D25-T2 and D2-C3-T4. When the voltage on the clamping capacitor C3 is lower than zero, Figure 7 The dotted line loop shown is charged to zero. When the voltage of the clamping capacitor is greater than zero, Figure 8 The dashed loop shown is discharged to zero by the load current. Figure 7In working mode 3, transistors T1 and T3 are continuously turned on, transistors T2 and T4 are continuously turned off, and the output voltage is zero. A load current bidirectional flow loop is formed through T1-C3-D3 and T3-C3-D1. When the voltage on the clamping capacitor C3 is lower than zero, Figure 7 The dotted line loop shown is for charging to zero. There is no discharge loop in this mode. Figure 10 In working mode 4, transistors T3 and T4 are continuously turned on, while transistors T1 and T2 are continuously turned off. The output voltage is -Vdc / 2. Due to the conduction of T3 and T4 and the AC circuit formed by D3 and D4, a bidirectional flow loop of the load current is formed. When the voltage on the clamping capacitor C3 is lower than zero, Figure 10 The dashed circuit shown is charged to zero, and there is no discharge circuit in this mode. By alternating between the four operating modes, the inverter achieves three-level output while improving waveform quality and reducing device overvoltage.
[0033] The above description is only a preferred embodiment of the present invention, but is not intended to limit the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.
Claims
1. A three-phase hybrid clamped three-level inverter with a wide voltage output range, comprising a DC voltage source module, a Y-type inverter module, a hybrid clamping module, a MOSFET control module, and a three-phase load module; characterized in that The output of the DC voltage source module is connected to the input of the Y-type inverter module, the hybrid clamp module is connected to the Y-type inverter module, the output of the MOSFET control module is connected to the input of the Y-type inverter module, and the output of the Y-type inverter module is connected to the input of the three-phase load module; the DC voltage source module includes a voltage source Vdc1, a voltage source Vdc2, a capacitor C i , ground port GND1; the Y-type inverter module includes a crystal switch tube T1, a crystal switch tube T2, a crystal switch tube T3, a crystal switch tube T4, a crystal switch tube T5, a crystal switch tube T6, a crystal switch tube T7, a crystal switch tube T8, a crystal switch tube T9, a crystal switch tube T10, a crystal switch tube T11, a crystal switch tube T12, a crystal switch tube T13, a crystal switch tube T14, a crystal switch tube T15, a crystal switch tube T16, a crystal switch tube T17, a crystal switch tube T18, a crystal switch tube T19, a crystal switch tube T20, a crystal switch tube T21, a crystal switch tube T22, a crystal switch tube T23, a crystal switch tube T24, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a diode D9, a diode D10, a diode D11, a diode D 12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, capacitor C9, capacitor C10, capacitor C11; the hybrid clamp module includes diode D25, diode D26, diode D27, diode D28, diode D29, diode D30, diode D31, diode D32, diode D33, diode D34, diode D35, diode D36, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L4, inductor L5, inductor L6.
2. The three-phase hybrid clamped three-level inverter with a wide voltage output range according to claim 1, wherein: In the DC voltage source module, the voltage source Vdc1 and the voltage source Vdc2 are two identical DC voltage sources, the amplitude of which is Vdc / 2, and the positive electrode of the voltage source Vdc1 is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the drain of transistor switch tube T1, the negative electrode is connected to the positive electrode of voltage source Vdc2 and ground port GND1, the negative electrode of voltage source Vdc2 is connected to capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the source electrode of transistor switch tube T4.
3. The three-phase hybrid clamped three-level inverter with a wide voltage output range according to claim 1, wherein: The MOSFET control module outputs 24 control signals, and the output interfaces are MOS transistor T1, MOS transistor T2, MOS transistor T3, MOS transistor T4, MOS transistor T5, MOS transistor T6, MOS transistor T7, MOS transistor T8, MOS transistor T9, MOS transistor T10, MOS transistor T11, MOS transistor T12, MOS transistor T13, MOS transistor T14, MOS transistor T15, MOS transistor T16, MOS transistor T17, MOS transistor T18, MOS transistor T19, MOS transistor T20, MOS transistor T21, MOS transistor T22, MOS transistor T23, and MOS transistor T24.
4. The three-phase hybrid clamped three-level inverter with a wide voltage output range according to claim 1, wherein: In the Y-type inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the drain is connected to the capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D1, the source is connected to the drain of transistor switch tube T2, the anode of diode D1 and the positive electrode of capacitor C3, the gate of transistor switch tube T2 is connected to the T2 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T1, the cathode of diode D2 and the positive electrode of capacitor C3, the source is connected to the drain of transistor switch tube T3, the anode of diode D2 and the positive electrode of inductor L1, the gate of transistor switch tube T3 is connected to the T3 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T2, the cathode of diode D3 and the positive electrode of inductor L1, the source is connected to the drain of transistor switch tube T4, the anode of diode D3 and the negative electrode of capacitor C3, the gate of transistor switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T3, the anode of diode D3 and the negative electrode of capacitor C3, the source is connected to the i The cathode is connected to the cathode of capacitor C2 and the anode of diode D4, the gate of transistor switch tube T5 is connected to the T5 output interface of MOSFET control module, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D5, the source is connected to the drain of transistor switch tube T6, the anode of diode D5 and the positive electrode of capacitor C4, the gate of transistor switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T5, the cathode of diode D6 and the positive electrode of capacitor C4, the source is connected to the drain of transistor switch tube T7, the anode of diode D6 and the positive electrode of inductor L5, the gate of transistor switch tube T7 is connected to the T7 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T6, the cathode of diode D7 and the positive electrode of inductor L2, the source is connected to the drain of transistor switch tube T8, the anode of diode D7 and the negative electrode of capacitor C4, the gate of transistor switch tube T8 is connected to the T8 output interface of MOSFET control module, the drain is connected to the source of transistor switch tube T7, the anode of diode D8 and the negative electrode of capacitor C4, the source is connected to the capacitor C i The cathode is connected to the cathode of capacitor C2 and the anode of diode D8, the gate of transistor switch tube T9 is connected to the output interface of MOSFET control module T9, the drain is connected to capacitor C i The positive electrode is connected to the positive electrode of capacitor C1 and the cathode of diode D9, the source is connected to the drain of transistor T10, the anode of diode D9 and the positive electrode of capacitor C5, the gate of transistor T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the source of transistor T9, the cathode of diode D10 and the positive electrode of capacitor C5, the source is connected to the drain of transistor T11, the anode of diode D10 and the positive electrode of inductor L3, the gate of transistor T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the source of transistor T10, the cathode of diode D11 and the positive electrode of inductor L3, the source is connected to the drain of transistor T12, the anode of diode D11 and the negative electrode of capacitor C5, the gate of transistor T12 is connected to the T12 output interface of the MOSFET control module, the drain is connected to the source of transistor T11, the anode of diode D12 and the negative electrode of capacitor C5, and the source is connected to the capacitor C i The negative electrode is connected to the negative electrode of capacitor C2 and the anode of diode D12, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the cathode of diode D13 and the positive electrode of capacitor C9 and the positive electrode of resistor R1, the source is connected to the drain of crystal switch tube T14 and the anode of diode D13 and the positive electrode of capacitor C6, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the drain is connected to the source of crystal switch tube T13 and the cathode of diode D14 and the positive electrode of capacitor C6, the source is connected to the drain of crystal switch tube T15 and diode D The anode of transistor T14 is connected to the negative electrode of inductor L1, the gate of transistor T15 is connected to the output interface of T15 of MOSFET control module, the drain is connected to the source of transistor T14, the cathode of diode D15 and the negative electrode of inductor L1, the source is connected to the drain of transistor T16, the anode of diode D15 and the negative electrode of capacitor C6, the gate of transistor T16 is connected to the output interface of T16 of MOSFET control module, the drain is connected to the source of transistor T15, the cathode of diode D16 and the negative electrode of capacitor C6, the source is connected to the anode of diode D16 and the negative electrode of capacitor C2 and the negative electrode of capacitor C i The negative electrode is connected, the gate of the transistor switch tube T17 is connected to the T17 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D17 and the positive electrode of the capacitor C10 and the positive electrode of the resistor R2, the source is connected to the drain of the transistor switch tube T18 and the anode of the diode D17 and the positive electrode of the capacitor C7, the gate of the transistor switch tube T18 is connected to the T18 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T17 and the cathode of the diode D18 and the positive electrode of the capacitor C7, the source is connected to the drain of the transistor switch tube T19 and the anode of the diode D18 and the inductor L 2, the gate of the transistor switch tube T19 is connected to the T19 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T18, the cathode of the diode D19 and the negative electrode of the inductor L2, the source is connected to the drain of the transistor switch tube T20, the anode of the diode D19 and the negative electrode of the capacitor C7, the gate of the transistor switch tube T20 is connected to the T20 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T19, the cathode of the diode D20 and the negative electrode of the capacitor C7, the source is connected to the anode of the diode D20, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T21 is connected to the T21 output interface of the MOSFET control module, the drain is connected to the cathode of the diode D21, the positive electrode of the capacitor C11 and the positive electrode of the resistor R3, the source is connected to the drain of the transistor switch tube T22, the anode of the diode D21 and the positive electrode of the capacitor C8, the gate of the transistor switch tube T22 is connected to the T22 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T21, the cathode of the diode D22 and the positive electrode of the capacitor C8, the source is connected to the drain of the transistor switch tube T23, the anode of the diode D22 and the inductor L 3 is connected to the negative electrode, the gate of the transistor switch tube T23 is connected to the T23 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T22, the cathode of the diode D23 and the negative electrode of the inductor L3, the source is connected to the drain of the transistor switch tube T24, the anode of the diode D23 and the negative electrode of the capacitor C8, the gate of the transistor switch tube T24 is connected to the T24 output interface of the MOSFET control module, the drain is connected to the source of the transistor switch tube T23, the cathode of the diode D24 and the negative electrode of the capacitor C8, the source is connected to the anode of the diode D24, the negative electrode of the capacitor C2 and the negative electrode of the capacitor C i Negative pole connected.
5. The three-phase hybrid clamped three-level inverter with a wide voltage output range according to claim 1, wherein: In the hybrid clamping module, the cathode of the diode D25 is connected to the positive electrode of the capacitor C3, and the anode is connected to the cathode of the diode D26 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D26 is connected to the anode of the diode D25 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C3. The cathode of the diode D27 is connected to the positive electrode of the capacitor C4, and the anode is connected to the cathode of the diode D28 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D28 is connected to the anode of the diode D27 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C4. The cathode of the diode D29 is connected to the positive electrode of the capacitor C5, and the anode is connected to the cathode of the diode D30 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2. The cathode of the diode D30 is connected to the anode of the diode D29 and the negative electrode of the capacitor C1 and the positive electrode of the capacitor C2, and the anode is connected to the negative electrode of the capacitor C5. , the cathode of diode D31 is connected to the positive electrode of capacitor C6, and its anode is connected to the cathode of diode D32, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D32 is connected to the anode of diode D31, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C6. The cathode of diode D33 is connected to the positive electrode of capacitor C7, and its anode is connected to the cathode of diode D34, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D34 is connected to the anode of diode D33, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C7. The cathode of diode D35 is connected to the positive electrode of capacitor C8, and its anode is connected to the cathode of diode D36, the negative electrode of capacitor C1 and the positive electrode of capacitor C2. The cathode of diode D36 is connected to the anode of diode D35, the negative electrode of capacitor C1 and the positive electrode of capacitor C2, and its anode is connected to the negative electrode of capacitor C8. The positive electrode of capacitor C1 is connected to capacitor C i The positive electrode is connected to the negative electrode of capacitor C2 and the capacitor C i Negative pole connected.
6. The three-phase hybrid clamped three-level inverter with a wide voltage output range according to claim 1, wherein: In the three-phase load module, the positive electrode of the resistor R1 is connected to the positive electrode of the capacitor C9, and the negative electrode is connected to the positive electrode of the inductor L4; the positive electrode of the resistor R2 is connected to the positive electrode of the capacitor C10, and the negative electrode is connected to the positive electrode of the inductor L5; the positive electrode of the resistor R3 is connected to the positive electrode of the capacitor C11, and the negative electrode is connected to the positive electrode of the inductor L6; the negative electrode of the inductor L4, the negative electrode of the inductor L5, and the negative electrode of the inductor L6 are connected using a star-shaped connection with an ungrounded neutral point.