Three-phase inverter with wide voltage output range based on diode clamp

Abstract

The invention relates to the technical field of inverters, in particular to a three-phase voltage source inverter. The inverter based on the three-phase voltage source comprises a direct-current voltage source module, a Y-Inverter inversion module, an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) control module and a PMSM (Permanent Magnet Synchronous Motor) load module. The circuit has the characteristics of wide output voltage range and low harmonic wave, and is very wide in application prospect. Compared with a traditional inverter, the inverter has the advantages that a Y-shaped inverter structure is applied, wide-range voltage output is obtained, the inverter has better performance in the field of electric automobiles, the inverter can be compatible with voltage levels of various nominal batteries, meanwhile, compared with a two-level inverter, the inverter has the advantages that the output waveform is smoother, and the stability of the inverter is improved. The output voltage is close to sine waves, peripheral circuit interference is small, and the device is safer, more efficient, more stable and quite wide in application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of inverters, and in particular to a three-phase inverter with a wide output voltage range based on diode clamping. Technical Background

[0002] Nowadays, the fuel cell and electric vehicle lithium battery industries are developing rapidly, and the requirements for inverters are also increasing. Inverters are power electronic devices that can convert direct current into alternating current. The more commonly used three-phase inverter types are: Z-source inverter (Z-VSI), B-source inverter (B-VSI), current source inverter, and voltage source inverter. The motor drive powered by fuel cells has extremely high requirements. The inverter must cope with the wide DC voltage variation of the fuel cell that powers the motor drive, and should also output high-quality motor voltage. Traditional inverters contain two energy levels, which greatly increases losses.

[0003] In order to solve the above problems, the present invention proposes a three-phase inverter with a wide voltage output range based on diode clamping. Summary of the invention

[0004] The object of the present invention is to provide a three-phase inverter with a wide voltage output range based on diode clamping, so as to solve the problem that the traditional three-phase inverter cannot achieve a wide output voltage range.

[0005] The technical solution adopted by the present invention is: a three-phase inverter with a wide voltage output range based on diode clamping, comprising a DC voltage source module, a Y-Inverter inverter module, a MOSFET control module, and a PMSM load module; the DC voltage source module output is connected to the Y-Inverter inverter module input, the MOSFET control module output is connected to the Y-Inverter inverter module input, and the Y-Inverter inverter module output is connected to the PMSM load module input; the DC voltage source module comprises a voltage source V dcThe Y-Inverter 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 body switch tube T23, a crystal switch tube T24, a diode D1, a diode D2, and a diode D3 , diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, 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 L1, inductor L2, inductor L3, capacitor C i , capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor Ca, capacitor Cb, capacitor Cc; the voltage source V of the DC voltage source module dc The capacitor C between the positive electrode and the Y-Inverter inverter module i The positive pole is connected to the voltage source V dc The capacitor C between the negative electrode and the Y-Inverter inverter module i Negative pole connected.

[0006] The MOSFET control module outputs 24 control signals, and the output interfaces are MOS tube T1, MOS tube T2, MOS tube T3, MOS tube T4, MOS tube T5, MOS tube T6, MOS tube T7, MOS tube T8, MOS tube T9, MOS tube T10, MOS tube T11, MOS tube T12, MOS tube T13, MOS tube T14, MOS tube T15, MOS tube T16, MOS tube T17, MOS tube T18, MOS tube T19, MOS tube T20, MOS tube T21, MOS tube T22, MOS tube T23, and MOS tube T24.

[0007] In the Y-Inverter inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the source is connected to the capacitor C i The negative electrode is connected to the anode of diode D1 and the negative electrode of capacitor C1, the drain is connected to the anode of diode D25 and the cathode of diode D1, the gate of crystal switch tube T2 is connected to the T2 output interface of MOSFET control module, the source is connected to the anode of diode D2 and the anode of diode D25, the drain is connected to the cathode of diode D2 and the positive electrode of inductor L1, the cathode of diode D25 is connected to the positive electrode of capacitor C1, the negative electrode of capacitor C2 and the anode of diode D26, the gate of crystal switch tube T3 is connected to the T3 output interface of MOSFET control module, the source is connected to the anode of diode D3 and the positive electrode of inductor L1, the drain is connected to the cathode of diode D3 and the cathode of diode D26, the gate of crystal switch tube T4 is connected to the T4 output interface of MOSFET control module, the source is connected to the anode of diode D4 and the cathode of diode D26, the drain is connected to the cathode of diode D4 and capacitor C i The positive electrode is connected to the positive electrode of capacitor C2, the gate of crystal switch tube T5 is connected to the T5 output interface of MOSFET control module, the source is connected to the anode of diode D5, the negative electrode of capacitor C3 and the negative electrode of capacitor Ca, the drain is connected to the anode of diode D31 and the cathode of diode D5, the gate of crystal switch tube T6 is connected to the T6 output interface of MOSFET control module, the source is connected to the anode of diode D6 and the anode of diode D31, the drain is connected to the cathode of diode D6 and the negative electrode of inductor L1, the cathode of diode D31 is connected to the positive electrode of capacitor C3, the negative electrode of capacitor C4 and diode D32 The anode of the transistor switch tube T7 is connected to the T7 output interface of the MOSFET control module, the source is connected to the anode of the diode D7 and the negative electrode of the inductor L1, the drain is connected to the cathode of the diode D7 and the cathode of the diode D32, the gate of the transistor switch tube T8 is connected to the T8 output interface of the MOSFET control module, the source is connected to the anode of the diode D8 and the cathode of the diode D32, the drain is connected to the cathode of the diode D8 and the positive electrode of the capacitor C4 and the positive electrode of the capacitor Ca, the gate of the transistor switch tube T9 is connected to the T9 output interface of the MOSFET control module, the source is connected to the capacitor C iThe negative electrode is connected to the anode of diode D9 and the negative electrode of capacitor C5, the drain is connected to the anode of diode D27 and the cathode of diode D9, the gate of crystal switch tube T10 is connected to the T10 output interface of MOSFET control module, the source is connected to the anode of diode D10 and the anode of diode D27, the drain is connected to the cathode of diode D10 and the positive electrode of inductor L2, the cathode of diode D27 is connected to the positive electrode of capacitor C5, the negative electrode of capacitor C6 and the anode of diode D28, the gate of crystal switch tube T11 is connected to the T11 output interface of MOSFET control module, the source is connected to the anode of diode D11 and the positive electrode of inductor L2, the drain is connected to the cathode of diode D11 and the cathode of diode D28, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the source is connected to the anode of diode D12 and the cathode of diode D28, the drain is connected to the cathode of diode D12 and the capacitor C i The positive electrode is connected to the positive electrode of capacitor C6, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the source is connected to the anode of diode D13, the negative electrode of capacitor C7 and the negative electrode of capacitor Cb, the drain is connected to the anode of diode D33 and the cathode of diode D13, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the source is connected to the anode of diode D14 and the anode of diode D33, the drain is connected to the cathode of diode D14 and the negative electrode of inductor L2, the cathode of diode D33 is connected to the positive electrode of capacitor C7, the negative electrode of capacitor C8 and the anode of diode D34 The gate of the crystal switch tube T15 is connected to the T15 output interface of the MOSFET control module, the source is connected to the anode of the diode D15 and the negative electrode of the inductor L2, the drain is connected to the cathode of the diode D15 and the cathode of the diode D34, the gate of the crystal switch tube T16 is connected to the T16 output interface of the MOSFET control module, the source is connected to the anode of the diode D16 and the cathode of the diode D34, the drain is connected to the cathode of the diode D16 and the positive electrode of the capacitor C8 and the positive electrode of the capacitor Cb, the gate of the crystal switch tube T17 is connected to the T17 output interface of the MOSFET control module, the source is connected to the capacitor C iThe negative electrode is connected to the anode of diode D17 and the negative electrode of capacitor C9, the drain is connected to the anode of diode D29 and the cathode of diode D17, the gate of crystal switch tube T18 is connected to the T18 output interface of MOSFET control module, the source is connected to the anode of diode D18 and the anode of diode D29, the drain is connected to the cathode of diode D18 and the positive electrode of inductor L3, the cathode of diode D29 is connected to the positive electrode of capacitor C9, the negative electrode of capacitor C10 and the anode of diode D30, the gate of crystal switch tube T19 is connected to the T19 output interface of MOSFET control module, the source is connected to the anode of diode D19 and the positive electrode of inductor L3, the drain is connected to the cathode of diode D19 and the cathode of diode D30, the gate of crystal switch tube T20 is connected to the T20 output interface of MOSFET control module, the source is connected to the anode of diode D20 and the cathode of diode D30, the drain is connected to the cathode of diode D20 and the capacitor C i The positive electrode is connected to the positive electrode of capacitor C10, the gate of the crystal switch tube T21 is connected to the T21 output interface of the MOSFET control module, the source is connected to the anode of the diode D21 and the negative electrode of the capacitor C11 and the negative electrode of the capacitor Cc, the drain is connected to the anode of the diode D35 and the cathode of the diode D21, the gate of the crystal switch tube T22 is connected to the T22 output interface of the MOSFET control module, the source is connected to the anode of the diode D22 and the anode of the diode D35, the drain is connected to the cathode of the diode D22 and the negative electrode of the inductor L3, and the cathode of the diode D35 is connected to the capacitor C1 The positive electrode of 1 is connected to the negative electrode of capacitor C12 and the anode of diode D36, the gate of crystal switch tube T23 is connected to the output interface of T23 of MOSFET control module, the source is connected to the anode of diode D23 and the negative electrode of inductor L3, the drain is connected to the cathode of diode D23 and the cathode of diode D36, the gate of crystal switch tube T24 is connected to the output interface of T24 of MOSFET control module, the source is connected to the anode of diode D24 and the cathode of diode D36, the drain is connected to the cathode of diode D24 and the positive electrode of capacitor C12 and the positive electrode of capacitor Cc, capacitor C i Positive terminal and voltage source V i The positive electrode is connected to the capacitor C i The negative electrode is connected to the negative electrode of capacitor Ca, the negative electrode of capacitor Cb and the negative electrode of capacitor Cc. The input port a of the PMSM load module is connected to the positive electrode of capacitor Ca in the Y-Inverter inverter module, the input port b of the PMSM load module is connected to the positive electrode of capacitor Cb in the Y-Inverter inverter module, and the input port c of the PMSM load module is connected to the positive electrode of capacitor Cc in the Y-Inverter inverter module.

[0008] The advantages of the three-phase inverter with a wide voltage output range based on diode clamping of the present invention are: first, in the inverter bridge part, a connection method different from that of the traditional inverter is applied to connect three identical DC / DC converters to a common "Y" point; second, a diode clamping mechanism is added to the inverter topology structure, so that the output waveform of the inverter described in the present invention is closer to sine than that of the ordinary two-level inverter, and a wide voltage range output can be achieved. Compared with the traditional inverter, the inverter of the present invention has a wider voltage output range, good output waveform quality, and is more efficient, stable and reliable.

[0009] In order to more clearly illustrate the three-phase inverter with a wide voltage output range based on diode clamping proposed by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the three-phase inverter with a wide voltage output range based on diode clamping proposed by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0011] Figure 1 The circuit structure diagram of a three-phase inverter with a wide voltage output range based on diode clamping according to the present invention.

[0012] Figure 2 It is the buck-boost module of phase A in the inverter.

[0013] Figure 3 This is the working mode when the output voltage is lower than the input voltage.

[0014] Figure 4 This is the operating mode when the output voltage is higher than the input voltage. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be noted that the embodiments described here are only partial embodiments of the present invention, rather than all implementation methods of the present invention, and the embodiments are only exemplary.

[0016] Figure 1The circuit structure diagram of a three-phase inverter with a wide voltage output range based on diode clamping of the present invention is as follows: it includes a DC voltage source module, a Y-Inverter inverter module, a MOSFET control module, and a PMSM load module; it is characterized in that the output of the DC voltage source module is connected to the input of the Y-Inverter inverter module, the output of the MOSFET control module is connected to the input of the Y-Inverter inverter module, and the output of the Y-Inverter inverter module is connected to the input of the PMSM load module; the DC voltage source module includes a voltage source V dc The Y-Inverter 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 body switch tube T23, a crystal switch tube T24, a diode D1, a diode D2, and a diode D3 , diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, 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 L1, inductor L2, inductor L3, capacitor C i , capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor Ca, capacitor Cb, capacitor Cc.

[0017] The voltage source V of the DC voltage source module i The capacitor C between the positive electrode and the Y-Inverter inverter module i The positive pole is connected to the voltage source V i The capacitor C between the negative electrode and the Y-Inverter inverter module i Negative pole connected.

[0018] The MOSFET control module outputs 24 control signals, and the output interfaces are MOS tube T1, MOS tube T2, MOS tube T3, MOS tube T4, MOS tube T5, MOS tube T6, MOS tube T7, MOS tube T8, MOS tube T9, MOS tube T10, MOS tube T11, MOS tube T12, MOS tube T13, MOS tube T14, MOS tube T15, MOS tube T16, MOS tube T17, MOS tube T18, MOS tube T19, MOS tube T20, MOS tube T21, MOS tube T22, MOS tube T23, and MOS tube T24.

[0019] In the Y-Inverter inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the source is connected to the capacitor C i The negative electrode is connected to the anode of diode D1 and the negative electrode of capacitor C1, the drain is connected to the anode of diode D25 and the cathode of diode D1, the gate of crystal switch tube T2 is connected to the T2 output interface of MOSFET control module, the source is connected to the anode of diode D2 and the anode of diode D25, the drain is connected to the cathode of diode D2 and the positive electrode of inductor L1, the cathode of diode D25 is connected to the positive electrode of capacitor C1, the negative electrode of capacitor C2 and the anode of diode D26, the gate of crystal switch tube T3 is connected to the T3 output interface of MOSFET control module, the source is connected to the anode of diode D3 and the positive electrode of inductor L1, the drain is connected to the cathode of diode D3 and the cathode of diode D26, the gate of crystal switch tube T4 is connected to the T4 output interface of MOSFET control module, the source is connected to the anode of diode D4 and the cathode of diode D26, the drain is connected to the cathode of diode D4 and capacitor C i The positive electrode is connected to the positive electrode of capacitor C2, the gate of crystal switch tube T5 is connected to the T5 output interface of MOSFET control module, the source is connected to the anode of diode D5, the negative electrode of capacitor C3 and the negative electrode of capacitor Ca, the drain is connected to the anode of diode D31 and the cathode of diode D5, the gate of crystal switch tube T6 is connected to the T6 output interface of MOSFET control module, the source is connected to the anode of diode D6 and the anode of diode D31, the drain is connected to the cathode of diode D6 and the negative electrode of inductor L1, the cathode of diode D31 is connected to the positive electrode of capacitor C3, the negative electrode of capacitor C4 and diode D32 The anode of the transistor switch tube T7 is connected to the T7 output interface of the MOSFET control module, the source is connected to the anode of the diode D7 and the negative electrode of the inductor L1, the drain is connected to the cathode of the diode D7 and the cathode of the diode D32, the gate of the transistor switch tube T8 is connected to the T8 output interface of the MOSFET control module, the source is connected to the anode of the diode D8 and the cathode of the diode D32, the drain is connected to the cathode of the diode D8 and the positive electrode of the capacitor C4 and the positive electrode of the capacitor Ca, the gate of the transistor switch tube T9 is connected to the T9 output interface of the MOSFET control module, the source is connected to the capacitor Ci The negative electrode is connected to the anode of diode D9 and the negative electrode of capacitor C5, the drain is connected to the anode of diode D27 and the cathode of diode D9, the gate of crystal switch tube T10 is connected to the T10 output interface of MOSFET control module, the source is connected to the anode of diode D10 and the anode of diode D27, the drain is connected to the cathode of diode D10 and the positive electrode of inductor L2, the cathode of diode D27 is connected to the positive electrode of capacitor C5, the negative electrode of capacitor C6 and the anode of diode D28, the gate of crystal switch tube T11 is connected to the T11 output interface of MOSFET control module, the source is connected to the anode of diode D11 and the positive electrode of inductor L2, the drain is connected to the cathode of diode D11 and the cathode of diode D28, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the source is connected to the anode of diode D12 and the cathode of diode D28, the drain is connected to the cathode of diode D12 and the capacitor C i The positive electrode is connected to the positive electrode of capacitor C6, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the source is connected to the anode of diode D13, the negative electrode of capacitor C7 and the negative electrode of capacitor Cb, the drain is connected to the anode of diode D33 and the cathode of diode D13, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the source is connected to the anode of diode D14 and the anode of diode D33, the drain is connected to the cathode of diode D14 and the negative electrode of inductor L2, the cathode of diode D33 is connected to the positive electrode of capacitor C7, the negative electrode of capacitor C8 and the anode of diode D34 The gate of the crystal switch tube T15 is connected to the T15 output interface of the MOSFET control module, the source is connected to the anode of the diode D15 and the negative electrode of the inductor L2, the drain is connected to the cathode of the diode D15 and the cathode of the diode D34, the gate of the crystal switch tube T16 is connected to the T16 output interface of the MOSFET control module, the source is connected to the anode of the diode D16 and the cathode of the diode D34, the drain is connected to the cathode of the diode D16 and the positive electrode of the capacitor C8 and the positive electrode of the capacitor Cb, the gate of the crystal switch tube T17 is connected to the T17 output interface of the MOSFET control module, the source is connected to the capacitor C iThe negative electrode is connected to the anode of diode D17 and the negative electrode of capacitor C9, the drain is connected to the anode of diode D29 and the cathode of diode D17, the gate of crystal switch tube T18 is connected to the T18 output interface of MOSFET control module, the source is connected to the anode of diode D18 and the anode of diode D29, the drain is connected to the cathode of diode D18 and the positive electrode of inductor L3, the cathode of diode D29 is connected to the positive electrode of capacitor C9, the negative electrode of capacitor C10 and the anode of diode D30, the gate of crystal switch tube T19 is connected to the T19 output interface of MOSFET control module, the source is connected to the anode of diode D19 and the positive electrode of inductor L3, the drain is connected to the cathode of diode D19 and the cathode of diode D30, the gate of crystal switch tube T20 is connected to the T20 output interface of MOSFET control module, the source is connected to the anode of diode D20 and the cathode of diode D30, the drain is connected to the cathode of diode D20 and the capacitor C i The positive electrode is connected to the positive electrode of capacitor C10, the gate of the crystal switch tube T21 is connected to the T21 output interface of the MOSFET control module, the source is connected to the anode of the diode D21 and the negative electrode of the capacitor C11 and the negative electrode of the capacitor Cc, the drain is connected to the anode of the diode D35 and the cathode of the diode D21, the gate of the crystal switch tube T22 is connected to the T22 output interface of the MOSFET control module, the source is connected to the anode of the diode D22 and the anode of the diode D35, the drain is connected to the cathode of the diode D22 and the negative electrode of the inductor L3, and the cathode of the diode D35 is connected to the capacitor C1 The positive electrode of 1 is connected to the negative electrode of capacitor C12 and the anode of diode D36, the gate of crystal switch tube T23 is connected to the output interface of T23 of MOSFET control module, the source is connected to the anode of diode D23 and the negative electrode of inductor L3, the drain is connected to the cathode of diode D23 and the cathode of diode D36, the gate of crystal switch tube T24 is connected to the output interface of T24 of MOSFET control module, the source is connected to the anode of diode D24 and the cathode of diode D36, the drain is connected to the cathode of diode D24 and the positive electrode of capacitor C12 and the positive electrode of capacitor Cc, capacitor C i Positive terminal and voltage source V i The positive electrode is connected to the capacitor C i The negative electrode is connected to the negative electrode of capacitor Ca, the negative electrode of capacitor Cb and the negative electrode of capacitor Cc. The input port a of the PMSM load module is connected to the positive electrode of capacitor Ca in the Y-Inverter inverter module, the input port b of the PMSM load module is connected to the positive electrode of capacitor Cb in the Y-Inverter inverter module, and the input port c of the PMSM load module is connected to the positive electrode of capacitor Cc in the Y-Inverter inverter module.

[0020] Next, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4The present invention first adds 6 groups of MOSFET transistors and 24 corresponding freewheeling diodes to the inverter bridge part to achieve a wide voltage output range. It uses a different connection method from the traditional inverter and connects three identical DC / DC converters to a common "Y" point. The Y-type inverter bridge part is composed of three buck-boost modules, each module operates independently. Figure 2 For the buck-boost module of phase A, the control strategies of the three modules are independent of each other, which means that the control strategy of the three phases is relatively simple.

[0021] Taking phase a voltage as an example, transistors T7 and T8 are continuously turned on, transistors T5 and T6 are continuously turned off, and transistors T1, T2, T3 and T4 are alternately turned on and off 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 T3 and T4 are continuously turned on, transistors T1 and T2 are continuously turned off, and transistors T5, T6, T7 and T8 are alternately turned on and off to obtain Figure 4 At this time, the buck-boost module of phase A is in boost mode, and the output voltage is higher than the input voltage. The on-off principles of the other two phases are the same.

[0022] by Figure 3 For example, at this time, the a-phase buck-boost module is in buck mode, and transistors T1, T2, T3 and T4 are turned on and off alternately, and each phase bridge arm has three level states: when transistors T3 and T4 are turned on, transistors T1 and T2 are turned off, and the a-phase output is high level; when transistors T1 and T2 are turned on, transistors T3 and T4 are turned off, and the a-phase output is low level; when transistor T3 is turned on alone, and transistors T1, T2 and T4 are turned off, the a-phase output is 0 level, and when transistor T2 is turned on alone, and transistors T1, T3 and T4 are turned off, the a-phase output is also 0 level. When the a-phase buck-boost module works in boost mode, the level state of each phase bridge arm is also three, which will not be described in detail here. The on-off principles of the other two phases are the same. In this way, the direct current passes through the buck-boost module of the Y-type inverter and outputs three-phase alternating current with a wide voltage range. Moreover, the three-phase inverter based on diode clamping of the present invention has an output waveform closer to sine wave than the two-level inverter, and has fewer harmonics at the same switching frequency.

[0023] 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 should be based on the definition of the claims.

Claims

1. A three-phase inverter with a wide voltage output range based on diode clamping, comprising a DC voltage source module, a Y-Inverter inverter module, a MOSFET control module, and a PMSM load module; characterized in that The output of the DC voltage source module is connected to the input of the Y-Inverter inverter module, the output of the MOSFET control module is connected to the input of the Y-Inverter inverter module, and the output of the Y-Inverter inverter module is connected to the input of the load module; the DC voltage source module includes a voltage source Vdc; the Y-Inverter 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, Crystal switch tube T21, crystal switch tube T22, body switch tube T23, crystal switch tube T24, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D10, diode D11, diode D12, diode D13, diode D14, diode D15, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, 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 L1, inductor L2, inductor L3, capacitor C i , capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor Ca, capacitor Cb, capacitor Cc. The three-phase inverter with a wide voltage output range based on diode clamping as claimed in claim 1 is characterized in that: The positive electrode of the voltage source Vdc of the DC voltage source module is connected to the positive electrode of the capacitor Ci of the Y-Inverter inverter module, and the negative electrode of the voltage source Vdc is connected to the negative electrode of the capacitor Ci of the Y-Inverter inverter module. The three-phase inverter with a wide voltage output range based on diode clamping as claimed in claim 2 is characterized in that: The MOSFET control module outputs 24 control signals, and the output interfaces are MOS tube T1, MOS tube T2, MOS tube T3, MOS tube T4, MOS tube T5, MOS tube T6, MOS tube T7, MOS tube T8, MOS tube T9, MOS tube T10, MOS tube T11, MOS tube T12, MOS tube T13, MOS tube T14, MOS tube T15, MOS tube T16, MOS tube T17, MOS tube T18, MOS tube T19, MOS tube T20, MOS tube T21, MOS tube T22, MOS tube T23, and MOS tube T24. The three-phase inverter with a wide voltage output range based on diode clamping as claimed in claim 3 is characterized in that: In the Y-Inverter inverter module, the gate of the transistor switch tube T1 is connected to the T1 output interface of the MOSFET control module, and the source is connected to the capacitor C i The negative electrode is connected to the anode of the diode D1 and the negative electrode of the capacitor C1, the drain is connected to the anode of the diode D25 and the cathode of the diode D1, the gate of the crystal switch tube T2 is connected to the T2 output interface of the MOSFET control module, the source is connected to the anode of the diode D2 and the anode of the diode D25, the drain is connected to the cathode of the diode D2 and the positive electrode of the inductor L1, the cathode of the diode D25 is connected to the positive electrode of the capacitor C1, the negative electrode of the capacitor C2 and the anode of the diode D26, the gate of the crystal switch tube T3 is connected to the T3 output interface of the MOSFET control module, the source is connected to the anode of the diode D3 and the positive electrode of the inductor L1, the drain is connected to the cathode of the diode D3 and the cathode of the diode D26, the gate of the crystal switch tube T4 is connected to the T4 output interface of the MOSFET control module, the source is connected to the anode of the diode D4 and the cathode of the diode D26, the drain is connected to the cathode of the diode D4 and the positive electrode of the capacitor Ci and the positive electrode of the capacitor C2, the gate of the crystal switch tube T5 is connected to the T5 output interface of the MOSFET control module, the source is connected to the diode The anode of D5 is connected to the negative electrode of capacitor C3 and the negative electrode of capacitor Ca, and the drain is connected to the anode of diode D31 and the cathode of diode D5. The gate of crystal switch tube T6 is connected to the T6 output interface of MOSFET control module, the source is connected to the anode of diode D6 and the anode of diode D31, the drain is connected to the cathode of diode D6 and the negative electrode of inductor L1, the cathode of diode D31 is connected to the positive electrode of capacitor C3, the negative electrode of capacitor C4 and the anode of diode D32. The gate of crystal switch tube T7 is connected to the T7 output interface of MOSFET control module, the source is connected to the anode of diode D7 and the negative electrode of inductor L1, the drain is connected to the cathode of diode D7 and the cathode of diode D32. The gate of crystal switch tube T8 is connected to the T8 output interface of MOSFET control module, the source is connected to the anode of diode D8 and the cathode of diode D32, the drain is connected to the cathode of diode D8 and the positive electrode of capacitor C4 and the positive electrode of capacitor Ca. The gate of crystal switch tube T9 is connected to the T9 output interface of MOSFET control module, the source is connected to the capacitor C i The negative electrode is connected to the anode of diode D9 and the negative electrode of capacitor C5, the drain is connected to the anode of diode D27 and the cathode of diode D9, the gate of crystal switch tube T10 is connected to the T10 output interface of MOSFET control module, the source is connected to the anode of diode D10 and the anode of diode D27, the drain is connected to the cathode of diode D10 and the positive electrode of inductor L2, the cathode of diode D27 is connected to the positive electrode of capacitor C5, the negative electrode of capacitor C6 and the anode of diode D28, the gate of crystal switch tube T11 is connected to the T11 output interface of MOSFET control module, the source is connected to the anode of diode D11 and the positive electrode of inductor L2, the drain is connected to the cathode of diode D11 and the cathode of diode D28, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the source is connected to the anode of diode D12 and the cathode of diode D28, the drain is connected to the cathode of diode D12 and the positive electrode of capacitor Ci and the positive electrode of capacitor C6, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the source is connected to the diode D The anode of 13 is connected to the negative electrode of capacitor C7 and the negative electrode of capacitor Cb, the drain is connected to the anode of diode D33 and the cathode of diode D13, the gate of crystal switch tube T14 is connected to the T14 output interface of MOSFET control module, the source is connected to the anode of diode D14 and the anode of diode D33, the drain is connected to the cathode of diode D14 and the negative electrode of inductor L2, the cathode of diode D33 is connected to the positive electrode of capacitor C7, the negative electrode of capacitor C8 and the anode of diode D34, the gate of crystal switch tube T15 is connected to the MOSFET control module The source is connected to the anode of diode D15 and the negative electrode of inductor L2, the drain is connected to the cathode of diode D15 and the cathode of diode D34, the gate of crystal switch tube T16 is connected to the output interface of T16 of MOSFET control module, the source is connected to the anode of diode D16 and the cathode of diode D34, the drain is connected to the cathode of diode D16 and the positive electrode of capacitor C8 and the positive electrode of capacitor Cb, the gate of crystal switch tube T17 is connected to the output interface of T17 of MOSFET control module, the source is connected to the anode of diode D16 and the cathode of diode D34, the drain is connected to the cathode of diode D16 and the positive electrode of capacitor C8 and the positive electrode of capacitor Cb, i The negative electrode is connected to the anode of the diode D17 and the negative electrode of the capacitor C9, the drain is connected to the anode of the diode D29 and the cathode of the diode D17, the gate of the crystal switch tube T18 is connected to the T18 output interface of the MOSFET control module, the source is connected to the anode of the diode D18 and the anode of the diode D29, the drain is connected to the cathode of the diode D18 and the positive electrode of the inductor L3, the cathode of the diode D29 is connected to the positive electrode of the capacitor C9, the negative electrode of the capacitor C10 and the anode of the diode D30, the gate of the crystal switch tube T19 is connected to the T19 output interface of the MOSFET control module, the source is connected to the anode of the diode D19 and the positive electrode of the inductor L3, the drain is connected to the cathode of the diode D19 and the cathode of the diode D30, the gate of the crystal switch tube T20 is connected to the T20 output interface of the MOSFET control module, the source is connected to the anode of the diode D20 and the cathode of the diode D30, the drain is connected to the cathode of the diode D20 and the positive electrode of the capacitor Ci and the positive electrode of the capacitor C10, the gate of the crystal switch tube T21 is connected to the MOSFET control module The gate of the crystal switch tube T22 is connected to the T22 output interface of the MOSFET control module, the source is connected to the anode of the diode D21, the negative electrode of the capacitor C11 and the negative electrode of the capacitor Cc, the drain is connected to the anode of the diode D35 and the cathode of the diode D21, the gate of the crystal switch tube T22 is connected to the T22 output interface of the MOSFET control module, the source is connected to the anode of the diode D22 and the anode of the diode D35, the drain is connected to the cathode of the diode D22 and the negative electrode of the inductor L3, the cathode of the diode D35 is connected to the positive electrode of the capacitor C11, the negative electrode of the capacitor C12 and the anode of the diode D36, the gate of the crystal switch tube T23 is connected to the T23 output interface of the MOSFET control module, the source is connected to the anode of the diode D23 and the negative electrode of the inductor L3, the drain is connected to the cathode of the diode D23 and the cathode of the diode D36, the gate of the crystal switch tube T24 is connected to the T24 output interface of the MOSFET control module, the source is connected to the anode of the diode D24 and the cathode of the diode D36, the drain is connected to the cathode of the diode D24 and the positive electrode of the capacitor C12 and the positive electrode of the capacitor Cc, the capacitor C i Positive terminal and voltage source V i The positive electrode of the capacitor Ci is connected to the negative electrode of the capacitor Ca, the negative electrode of the capacitor Cb and the negative electrode of the capacitor Cc. The input port a of the PMSM load module is connected to the positive electrode of the capacitor Ca in the Y-Inverter inverter module, the input port b of the PMSM load module is connected to the positive electrode of the capacitor Cb in the Y-Inverter inverter module, and the input port c of the PMSM load module is connected to the positive electrode of the capacitor Cc in the Y-Inverter inverter module.

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