Three-phase resonance pole type inverter with low switching loss and wide voltage output range

Abstract

The invention relates to the technical field of inverters, in particular to a three-phase resonance pole type inverter with low switching loss and wide voltage output range. The inverter comprises a DC voltage source module, a Y-type inversion module, an MOSFET control module, a resonance pole type soft switching module and a three-phase load module. According to the utility model, a Y-shaped inverter structure is adopted, so that wide-range voltage output is obtained, and more types of motors can be driven. Besides, a resonance pole type soft switching module is added to the inverter bridge switching part, so that the inverter can significantly reduce switching loss, and the inverter can have good operation efficiency under high switching frequency. Compared with a traditional three-phase resonance direct-current link inverter, the three-phase resonance direct-current link inverter has a wider output voltage range and lower switching loss, electromagnetic interference and noise pollution of the inverter under high switching frequency can be effectively reduced, and the three-phase resonance direct-current link inverter is very wide in application prospect.

Description

Technical Field

[0001] This patent relates to the field of inverter technology, and specifically to a three-phase resonant pole-type inverter with low switching loss and wide voltage output range. Background Art

[0002] In today's power electronics industry, which is developing towards full control, integration and greening, the size and weight of power electronic devices are constantly shrinking and reducing, and the requirements for power electronic devices are getting higher and higher. An inverter is a device that converts direct current into alternating current based on power electronic switching devices. Currently, the more commonly used three-phase inverter types are: voltage source inverter (VSI), current source inverter (CSI), PWM inverter, etc. For traditional three-phase inverters, the output voltage range they provide is small. In addition, when the switching frequency is high, the hard-switching inverter will produce serious switching losses, accompanied by serious noise pollution and electromagnetic interference.

[0003] In order to solve the above problems, this patent proposes a three-phase resonant pole-type inverter with low switching loss and wide voltage output range. Summary of the invention

[0004] The purpose of this patent is to provide a three-phase resonant pole-type inverter with low switching loss and wide voltage output range to solve the problems that traditional three-phase inverters cannot achieve a wide output voltage range, have high switching losses, and suffer from noise pollution and electromagnetic interference.

[0005] The technical solution adopted by this patent is: a three-phase resonant pole inverter with low switching loss and wide voltage output range, including a DC voltage source module, a Y-type inverter module, a resonant pole soft switch 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 output of the MOSFET control module is connected to the input of the resonant pole soft switch module, the resonant pole soft switch 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 three-phase load module; the DC voltage source module includes a voltage source V dc , capacitor C iThe 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 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 diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D10, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, an inductor L4, an inductor L5, and an inductor L6; the resonant pole soft switch module includes a crystal switch tube T7, a crystal switch Tube T8, crystal switch tube T9, crystal switch tube T16, crystal switch tube T17, crystal switch tube T18, diode D7, diode D8, diode D9, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, inductor L7, inductor L8, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L10, inductor L11, inductor L12, and ground port GND1.

[0006] In the DC voltage source module, the voltage source V dc Positive electrode and capacitor C i The positive pole is connected to the voltage source V dc Negative electrode and capacitor C i The negative pole is connected, capacitor C i The positive electrode is connected to the cathode of diode D7, the cathode of diode D8, and the cathode of diode D9 of the resonant pole soft switch module, and the capacitor C i The negative electrode is connected to the anode of the diode D16, the anode of the diode D17, and the anode of the diode D18 of the resonant pole type soft switch module.

[0007] The MOSFET control module outputs 16 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, and MOS tube T16.

[0008] In the resonant pole soft switch module, the gate of the transistor switch tube T7 is connected to the T7 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L1 and the anode of the diode D7 and the cathode of the diode D16, and the source is connected to the capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T8 is connected to the T8 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L2 and the anode of the diode D8 and the cathode of the diode D17, and the source is connected to the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T9 is connected to the T9 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L3 and the anode of the diode D9 and the cathode of the diode D18, and the source is connected to the capacitor C i The negative electrode is connected to the gate of the transistor switch tube T16 and the T16 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L7 and the anode of the diode D19 and the cathode of the diode D22, and the source is connected to the 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 negative electrode of the inductor L8 and the anode of the diode D20 and the cathode of the diode D23, and the source is connected to the capacitor C i The negative electrode is connected, 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 negative electrode of the inductor L9 and the anode of the diode D21 and the cathode of the diode D24, and the source is connected to the capacitor C i The cathode of diode D7 is connected to the capacitor C i The positive electrode is connected to the cathode of diode D8 and capacitor C i The positive electrode is connected to the cathode of diode D9 and capacitor C i The positive pole is connected to the anode of diode D16 and the capacitor C i The cathode of diode D17 is connected to the anode of capacitor C i The cathode of diode D18 is connected to the anode of capacitor C i The cathode of diode D19 is connected to the capacitor C i The positive electrode is connected to the cathode of diode D20 and capacitor C i The positive electrode is connected to the cathode of diode D21 and the capacitor C i The positive pole is connected to the anode of diode D22 and the capacitor C i The cathode of diode D23 is connected to the anode of capacitor C i The cathode of diode D24 is connected to the anode of capacitor C i The negative electrode of inductor L1 is connected to the negative electrode of capacitor C1, the positive electrode of inductor L2 is connected to the negative electrode of capacitor C2, the positive electrode of inductor L3 is connected to the negative electrode of capacitor C3, the positive electrode of inductor L7 is connected to the negative electrode of capacitor C4, the positive electrode of inductor L8 is connected to the negative electrode of capacitor C5, the positive electrode of inductor L9 is connected to the negative electrode of capacitor C6, the positive electrode of capacitor C1 is connected to the positive electrode of inductor L4, the positive electrode of capacitor C2 is connected to the positive electrode of inductor L5, the positive electrode of capacitor C3 is connected to the positive electrode of inductor L6, the positive electrode of capacitor C4 is connected to the positive electrode of capacitor C7, the positive electrode of capacitor C5 is connected to the positive electrode of capacitor C8, and the positive electrode of capacitor C6 is connected to the positive electrode of capacitor C9.

[0009] 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 cathode of diode D1, the source is connected to the positive electrode of inductor L4 and the anode of diode D1, the gate of crystal switch tube T2 is connected to the T2 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D2, the source is connected to the positive electrode of inductor L5 and the anode of diode D2, the gate of crystal switch tube T3 is connected to the T3 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D3, the source electrode is connected to the positive electrode of inductor L6 and the anode of diode D3, the gate electrode of crystal switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain electrode is connected to the positive electrode of inductor L4 and the cathode of diode D4, the source electrode is connected to capacitor C i The cathode is connected to 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 the anode of inductor L5 and the cathode of diode D5, and the source is connected to capacitor C i The cathode is connected to the anode of diode D5, the gate of transistor switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the anode of inductor L6 and the cathode of diode D6, and the source is connected to capacitor C i The negative electrode is connected to the anode of the diode D6, the gate of the crystal switch tube T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C7 and the cathode of the diode D10, the source is connected to the negative electrode of the inductor L4 and the anode of the diode D10, the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C8 and the cathode of the diode D11, the source is connected to the negative electrode of the inductor L5 and the anode of the diode D11, and the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module , the drain is connected to the positive electrode of capacitor C8 and the cathode of diode D11, the source is connected to the negative electrode of inductor L6 and the anode of diode D11, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the drain is connected to the positive electrode of capacitor C9 and the cathode of diode D12, the source is connected to the negative electrode of inductor L6 and the anode of diode D10, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the negative electrode of inductor L4 and the cathode of diode D13, the source is connected to the negative electrode of capacitor C7 and the anode of diode D13 and capacitor C i The negative electrode is connected, the gate of the transistor switch tube T14 is connected to the T14 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L5 and the cathode of the diode D14, the source is connected to the negative electrode of the capacitor C8 and the anode of the diode D14 and the capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T15 is connected to the T15 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L6 and the cathode of the diode D15, the source is connected to the negative electrode of the capacitor C9 and the anode of the diode D15 and the capacitor C i Negative pole connected.

[0010] In the three-phase load module, the positive electrode of resistor R1 is connected to the positive electrode of capacitor C7 and the positive electrode of capacitor C4, and the negative electrode is connected to the positive electrode of inductor L10, the positive electrode of resistor R2 is connected to the positive electrode of capacitor C8 and the positive electrode of capacitor C5, and the negative electrode is connected to the positive electrode of inductor L11, the positive electrode of resistor R3 is connected to the positive electrode of capacitor C9 and the positive electrode of capacitor C6, and the negative electrode is connected to the positive electrode of inductor L12, the negative electrode of inductor L10, the negative electrode of inductor L11, and the negative electrode of inductor L12 are connected in a star-type neutral point grounding method, and the grounding port is GND1.

[0011] The advantages of the three-phase resonant pole type inverter with low switching loss and wide voltage output range in this patent are: first, in the inverter bridge part, a connection method different from that of the traditional inverter is used to connect three identical DC / DC converters to a common "Y" point; second, a resonant pole type soft switching module is added to the inverter switch part, so that the inverter described in this patent can achieve a wide voltage range, low switching loss and high switching frequency. Compared with the traditional three-phase bridge inverter, the three-phase resonant pole type inverter with low switching loss and wide voltage output range in this patent has a wider voltage output range, lower switching loss, higher switching frequency, higher circuit efficiency, lower noise pollution, stronger anti-electromagnetic interference ability, and is safer, more stable and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the three-phase resonant pole-type inverter with low switching loss and wide voltage output range proposed in this patent, the patent is further described in detail below in combination with the accompanying drawings and specific implementation methods.

[0013] Figure 1 This is the circuit structure diagram of a three-phase resonant pole inverter with soft switching function and wide voltage output range in this patent.

[0014] Figure 2 It is the buck-boost module of phase A in the inverter.

[0015] Figure 3 This is the working mode when the output voltage is lower than the input voltage.

[0016] Figure 4 This is the operating mode when the output voltage is higher than the input voltage.

[0017] Figure 5 This is the first working mode of the resonant pole soft switching module.

[0018] Figure 6 It is the second working mode of the resonant pole soft switching module.

[0019] Figure 7 It is the third working mode of the resonant pole soft switching module.

[0020] Figure 8 It is the fourth working mode of the resonant pole soft switching module.

[0021] Fig. 9 It is the fifth working mode of the resonant pole soft switching module.

[0022] Fig.10 It is the sixth working mode of the resonant pole soft switching module.

[0023] Fig.11 It is the seventh working mode of the resonant pole soft switching module. DETAILED DESCRIPTION

[0024] The following will combine the drawings in the embodiments of this patent to clearly and completely describe the technical solutions in the embodiments of this patent. It should be noted that the embodiments described here are only partial embodiments of this patent, not all implementation methods of this patent, and the embodiments are only exemplary.

[0025] Figure 1 This is a circuit diagram of a three-phase resonant pole inverter with low switching loss and wide voltage output range in this patent; its specific structure is as follows: it includes a DC voltage source module, a Y-type inverter module, a resonant pole soft switch 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 output of the MOSFET control module is connected to the input of the resonant pole soft switch module, the resonant pole soft switch 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 three-phase load module; the DC voltage source module includes a voltage source V dc , capacitor C i; 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 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 diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D10, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, an inductor L4, an inductor L5, and an inductor L6; the resonant pole type soft switch module includes a crystal switch tube T7 , crystal switch tube T8, crystal switch tube T9, crystal switch tube T16, crystal switch tube T17, crystal switch tube T18, diode D7, diode D8, diode D9, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, inductor L7, inductor L8, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L10, inductor L11, and inductor L12.

[0026] In the DC voltage source module, the voltage source V dc Positive electrode and capacitor C i The positive pole is connected to the voltage source V dc Negative electrode and capacitor C i The negative pole is connected, capacitor C i The positive electrode is connected to the cathode of diode D7, the cathode of diode D8, and the cathode of diode D9 of the resonant pole soft switch module, and the capacitor C i The negative electrode is connected to the anode of the diode D16, the anode of the diode D17, and the anode of the diode D18 of the resonant pole type soft switch module.

[0027] The MOSFET control module outputs 16 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, and MOS tube T16.

[0028] In the resonant pole soft switch module, the gate of the transistor switch tube T7 is connected to the T7 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L1 and the anode of the diode D7 and the cathode of the diode D16, and the source is connected to the capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T8 is connected to the T8 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L2 and the anode of the diode D8 and the cathode of the diode D17, and the source is connected to the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T9 is connected to the T9 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L3 and the anode of the diode D9 and the cathode of the diode D18, and the source is connected to the capacitor C i The negative electrode is connected to the gate of the transistor switch tube T16 and the T16 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L7 and the anode of the diode D19 and the cathode of the diode D22, and the source is connected to the 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 negative electrode of the inductor L8 and the anode of the diode D20 and the cathode of the diode D23, and the source is connected to the capacitor C i The negative electrode is connected, 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 negative electrode of the inductor L9 and the anode of the diode D21 and the cathode of the diode D24, and the source is connected to the capacitor C i The cathode of diode D7 is connected to the capacitor C i The positive electrode is connected to the cathode of diode D8 and capacitor C i The positive electrode is connected to the cathode of diode D9 and capacitor C i The positive pole is connected to the anode of diode D16 and the capacitor C i The cathode of diode D17 is connected to the anode of capacitor C i The cathode of diode D18 is connected to the anode of capacitor C i The cathode of diode D19 is connected to the capacitor C i The positive electrode is connected to the cathode of diode D20 and capacitor C i The positive electrode is connected to the cathode of diode D21 and the capacitor C i The positive pole is connected to the anode of diode D22 and the capacitor C i The cathode of diode D23 is connected to the anode of capacitor C i The cathode of diode D24 is connected to the anode of capacitor C i The negative electrode of inductor L1 is connected to the negative electrode of capacitor C1, the positive electrode of inductor L2 is connected to the negative electrode of capacitor C2, the positive electrode of inductor L3 is connected to the negative electrode of capacitor C3, the positive electrode of inductor L7 is connected to the negative electrode of capacitor C4, the positive electrode of inductor L8 is connected to the negative electrode of capacitor C5, the positive electrode of inductor L9 is connected to the negative electrode of capacitor C6, the positive electrode of capacitor C1 is connected to the positive electrode of inductor L4, the positive electrode of capacitor C2 is connected to the positive electrode of inductor L5, the positive electrode of capacitor C3 is connected to the positive electrode of inductor L6, the positive electrode of capacitor C4 is connected to the positive electrode of capacitor C7, the positive electrode of capacitor C5 is connected to the positive electrode of capacitor C8, and the positive electrode of capacitor C6 is connected to the positive electrode of capacitor C9.

[0029] 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 cathode of diode D1, the source is connected to the positive electrode of inductor L4 and the anode of diode D1, the gate of crystal switch tube T2 is connected to the T2 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D2, the source is connected to the positive electrode of inductor L5 and the anode of diode D2, the gate of crystal switch tube T3 is connected to the T3 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D3, the source electrode is connected to the positive electrode of inductor L6 and the anode of diode D3, the gate electrode of crystal switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain electrode is connected to the positive electrode of inductor L4 and the cathode of diode D4, the source electrode is connected to capacitor C i The cathode is connected to 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 the anode of inductor L5 and the cathode of diode D5, and the source is connected to capacitor C i The cathode is connected to the anode of diode D5, the gate of transistor switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the anode of inductor L6 and the cathode of diode D6, and the source is connected to capacitor C i The negative electrode is connected to the anode of the diode D6, the gate of the crystal switch tube T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C7 and the cathode of the diode D10, the source is connected to the negative electrode of the inductor L4 and the anode of the diode D10, the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C8 and the cathode of the diode D11, the source is connected to the negative electrode of the inductor L5 and the anode of the diode D11, and the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module , the drain is connected to the positive electrode of capacitor C8 and the cathode of diode D11, the source is connected to the negative electrode of inductor L6 and the anode of diode D11, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the drain is connected to the positive electrode of capacitor C9 and the cathode of diode D12, the source is connected to the negative electrode of inductor L6 and the anode of diode D10, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the negative electrode of inductor L4 and the cathode of diode D13, the source is connected to the negative electrode of capacitor C7 and the anode of diode D13 and capacitor C i The negative electrode is connected, the gate of the transistor switch tube T14 is connected to the T14 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L5 and the cathode of the diode D14, the source is connected to the negative electrode of the capacitor C8 and the anode of the diode D14 and the capacitor C iThe negative electrode is connected, the gate of the transistor switch tube T15 is connected to the T15 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L6 and the cathode of the diode D15, the source is connected to the negative electrode of the capacitor C9 and the anode of the diode D15 and the capacitor C i Negative pole connected.

[0030] In the three-phase load module, the positive electrode of resistor R1 is connected to the positive electrode of capacitor C7 and the positive electrode of capacitor C4, and the negative electrode is connected to the positive electrode of inductor L10, the positive electrode of resistor R2 is connected to the positive electrode of capacitor C8 and the positive electrode of capacitor C5, and the negative electrode is connected to the positive electrode of inductor L11, the positive electrode of resistor R3 is connected to the positive electrode of capacitor C9 and the positive electrode of capacitor C6, and the negative electrode is connected to the positive electrode of inductor L12, the negative electrode of inductor L10, the negative electrode of inductor L11, and the negative electrode of inductor L12 are connected in a star-type neutral point grounding method, and the grounding port is GND1.

[0031] Next, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 First, this patent adds 6 groups of MOSFET transistors and 12 groups of corresponding freewheeling diodes to the inverter bridge 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 is composed of three buck-boost modules. Figure 2 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. Taking the voltage of phase a as an example, the transistor T10 is kept on continuously, the transistor T13 is kept off continuously, and the transistors T1 and T4 are turned on and off alternately. 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; transistor T1 is kept on continuously, transistor T4 is kept off continuously, and transistors T10 and T13 are turned on and off alternately to obtain Figure 4 At this time, the a-phase buck-boost module 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. In this way, the DC power passes through the buck-boost module of the Y-type inverter and outputs three-phase AC power with a wide voltage range.

[0032] Afterwards, please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 In the above-mentioned inverter process, taking the lower bridge arm switching process in the A-phase buck mode as an example, the output voltage is lower than the input voltage at this time. Figure 5The transistor T7 in the middle changes from off to on. Due to the inductor L1 connected in series with it, the current rise slows down after the transistor T7 is turned on, achieving zero current soft turn-on of T7. The circuit diagram after T7 is turned on is as follows: Figure 6 At this time, the inductor L1 and the capacitor C1 are charged. When the current I Lx When the load current reaches I0, transistor T1 is turned off and transistor T2 is turned on at the same time. At this time, under the resonance of inductor L1 and capacitor C1, zero current soft turn-off of transistor T1 and zero voltage and zero current soft turn-on of transistor T2 are realized. The circuit diagram after transistor T2 is turned on is as follows: Figure 7 Due to the self-inductance, the inductor L1 continues to charge the capacitor C1, and the inductor L1 current I Lx It gradually decreases until it reaches zero, at which time the transistor T7 is turned off, achieving zero current soft turn-off of the transistor T7. The circuit diagram after the transistor T7 is turned off is as follows: Figure 8 At this time, diode D16 is turned on, the circuit starts to resonate, capacitor C1 reversely charges inductor L1, and U cr Reduce, I Lx In the opposite direction, when U cr When it decreases to 0, I Lx The reverse current increases to the maximum value, and then the inductor L1 charges the capacitor C1 in the reverse direction. Lx When it decreases to zero, Ucr increases to the reverse maximum value, diode D16 is naturally turned off, and diode D7 starts to conduct. The circuit diagram after diode D7 is turned on is as follows: Fig. 9 , capacitor C1 charges inductor L1, when U cr After the voltage is reduced to the load voltage, the diode D7 is naturally turned off. The circuit diagram after the diode D7 is turned off is as follows: Fig.10 , at this time, transistor T2 is normally turned on. After a period of time, transistor T7 changes from off to on. The circuit diagram after transistor T7 is turned on is Fig.11 , due to the inductor L1 connected in series with it, the current rise slows down after the transistor T7 is turned on, and the zero current soft turn-on of the transistor T7 is achieved. After the transistor T7 is turned on, the inductor L1 and the capacitor C1 begin to resonate, and the capacitor C1 charges the inductor L1, I Lx Increases, at this time the current flowing through transistor T2 begins to decrease, when the current flowing through transistor T2 decreases to zero, transistor T2 is turned off, transistor T1 is turned on, and zero current soft turn-on of transistor T1 and zero voltage and zero current soft turn-off of transistor T2 are achieved. In this way, the lower bridge arm of phase A completes a cycle. Through the resonant pole soft switching module, the loss generated when the crystal switch is turned on and off is greatly reduced, so that the overall circuit can operate in a higher frequency environment, reduce noise pollution, and enhance the circuit's ability to resist electromagnetic interference.

[0033] The above is only a preferred implementation of this patent, but it is not intended to limit this patent. Technical personnel familiar with the field can make various changes and modifications without departing from the spirit and scope of this patent. Therefore, the scope of protection of this patent should be based on the definition of the claims.

Claims

1. A three-phase resonant pole inverter with low switching loss and wide voltage output range, comprising a DC voltage source module, a Y-type inverter module, a resonant pole soft switch 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 output of the MOSFET control module is connected to the input of the resonant pole soft switch module, the resonant pole soft switch 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 three-phase load module; the DC voltage source module includes a DC voltage source V dc , capacitor C i ; 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 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 diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D10, a diode D11, a diode D12, a diode D13, a diode D14, a diode D15, an inductor L4, an inductor L5, an inductor L6, a capacitor C7, a capacitor C8, and a capacitor C9; The resonant pole soft switch module includes a crystal switch Tube T7, crystal switch tube T8, crystal switch tube T9, crystal switch tube T16, crystal switch tube T17, crystal switch tube T18, diode D7, diode D8, diode D9, diode D16, diode D17, diode D18, diode D19, diode D20, diode D21, diode D22, diode D23, diode D24, inductor L1, inductor L2, inductor L3, inductor L7, inductor L8, inductor L9, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6; the three-phase load module includes resistor R1, resistor R2, resistor R3, inductor L10, inductor L11, inductor L12, and ground port GND1.

2. A three-phase resonant pole-type inverter with low switching loss and wide voltage output range as claimed in claim 1, characterized in that: In the DC voltage source module, the voltage source V dc Positive electrode and capacitor C i The positive pole is connected to the voltage source V dc Negative electrode and capacitor C i The negative pole is connected, capacitor C i The positive electrode is connected to the cathode of diode D7, the cathode of diode D8, and the cathode of diode D9 of the resonant pole soft switch module, and the capacitor C i The negative electrode is connected to the anode of the diode D16, the anode of the diode D17, and the anode of the diode D18 of the resonant pole type soft switch module.

3. A three-phase resonant pole-type inverter with low switching loss and wide voltage output range as claimed in claim 1, characterized in that: The MOSFET control module outputs 16 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, and MOS tube T16.

4. A three-phase resonant pole-type inverter with low switching loss and wide voltage output range as claimed in claim 1, characterized in that: In the resonant pole soft switch module, the gate of the transistor switch tube T7 is connected to the T7 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L1 and the anode of the diode D7 and the cathode of the diode D16, and the source is connected to the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T8 is connected to the T8 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L2 and the anode of the diode D8 and the cathode of the diode D17, and the source is connected to the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T9 is connected to the T9 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L3 and the anode of the diode D9 and the cathode of the diode D18, and the source is connected to the capacitor C i The negative electrode is connected to the gate of the transistor switch tube T16 and the T16 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L7 and the anode of the diode D19 and the cathode of the diode D22, and the source is connected to the 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 negative electrode of the inductor L8 and the anode of the diode D20 and the cathode of the diode D23, and the source is connected to the capacitor C i The negative electrode is connected, 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 negative electrode of the inductor L9 and the anode of the diode D21 and the cathode of the diode D24, and the source is connected to the capacitor C i The cathode of diode D7 is connected to the capacitor C i The positive pole is connected to the cathode of diode D8 and capacitor C i The positive pole is connected to the cathode of diode D9 and capacitor C i The positive pole is connected to the anode of diode D16 and the capacitor C i The cathode of diode D17 is connected to the anode of capacitor C i The cathode of diode D18 is connected to the anode of capacitor C i The cathode of diode D19 is connected to the capacitor C i The positive electrode is connected to the cathode of diode D20 and capacitor C i The positive electrode is connected to the cathode of diode D21 and the capacitor C i The positive pole is connected to the anode of diode D22 and the capacitor C i The cathode of diode D23 is connected to the anode of capacitor C i The cathode of diode D24 is connected to the anode of capacitor C i The negative electrode of inductor L1 is connected to the negative electrode of capacitor C1, the positive electrode of inductor L2 is connected to the negative electrode of capacitor C2, the positive electrode of inductor L3 is connected to the negative electrode of capacitor C3, the positive electrode of inductor L7 is connected to the negative electrode of capacitor C4, the positive electrode of inductor L8 is connected to the negative electrode of capacitor C5, the positive electrode of inductor L9 is connected to the negative electrode of capacitor C6, the positive electrode of capacitor C1 is connected to the positive electrode of inductor L4, the positive electrode of capacitor C2 is connected to the positive electrode of inductor L5, the positive electrode of capacitor C3 is connected to the positive electrode of inductor L6, the positive electrode of capacitor C4 is connected to the positive electrode of capacitor C7, the positive electrode of capacitor C5 is connected to the positive electrode of capacitor C8, and the positive electrode of capacitor C6 is connected to the positive electrode of capacitor C9.

5. A three-phase resonant pole-type inverter with low switching loss and wide voltage output range as claimed in claim 1, characterized in that: 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 cathode of diode D1, the source is connected to the positive electrode of inductor L4 and the anode of diode D1, the gate of crystal switch tube T2 is connected to the T2 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D2, the source is connected to the positive electrode of inductor L5 and the anode of diode D2, the gate of crystal switch tube T3 is connected to the T3 output interface of MOSFET control module, and the drain is connected to capacitor C i The positive electrode is connected to the cathode of diode D3, the source electrode is connected to the positive electrode of inductor L6 and the anode of diode D3, the gate electrode of crystal switch tube T4 is connected to the T4 output interface of MOSFET control module, the drain electrode is connected to the positive electrode of inductor L4 and the cathode of diode D4, the source electrode is connected to capacitor C i The cathode is connected to 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 the anode of inductor L5 and the cathode of diode D5, and the source is connected to capacitor C i The negative electrode is connected to the anode of diode D5, the gate of crystal switch tube T6 is connected to the T6 output interface of MOSFET control module, the drain is connected to the positive electrode of inductor L6 and the cathode of diode D6, and the source is connected to capacitor C i The negative electrode is connected to the anode of the diode D6, the gate of the crystal switch tube T10 is connected to the T10 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C7 and the cathode of the diode D10, the source is connected to the negative electrode of the inductor L4 and the anode of the diode D10, the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module, the drain is connected to the positive electrode of the capacitor C8 and the cathode of the diode D11, the source is connected to the negative electrode of the inductor L5 and the anode of the diode D11, and the gate of the crystal switch tube T11 is connected to the T11 output interface of the MOSFET control module , the drain is connected to the positive electrode of capacitor C8 and the cathode of diode D11, the source is connected to the negative electrode of inductor L6 and the anode of diode D11, the gate of crystal switch tube T12 is connected to the T12 output interface of MOSFET control module, the drain is connected to the positive electrode of capacitor C9 and the cathode of diode D12, the source is connected to the negative electrode of inductor L6 and the anode of diode D10, the gate of crystal switch tube T13 is connected to the T13 output interface of MOSFET control module, the drain is connected to the negative electrode of inductor L4 and the cathode of diode D13, the source is connected to the negative electrode of capacitor C7 and the anode of diode D13 and capacitor C i The negative electrode is connected, the gate of the transistor switch tube T14 is connected to the T14 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L5 and the cathode of the diode D14, the source is connected to the negative electrode of the capacitor C8 and the anode of the diode D14 and the capacitor C i The negative electrode is connected, the gate of the transistor switch tube T15 is connected to the T15 output interface of the MOSFET control module, the drain is connected to the negative electrode of the inductor L6 and the cathode of the diode D15, the source is connected to the negative electrode of the capacitor C9 and the anode of the diode D15 and the capacitor C i Negative pole connected.

6. A three-phase resonant pole-type inverter with low switching loss and wide voltage output range as claimed in claim 1, characterized in that: In the three-phase load module, the positive electrode of resistor R1 is connected to the positive electrode of capacitor C7 and the positive electrode of capacitor C4, and the negative electrode is connected to the positive electrode of inductor L10, the positive electrode of resistor R2 is connected to the positive electrode of capacitor C8 and the positive electrode of capacitor C5, and the negative electrode is connected to the positive electrode of inductor L11, the positive electrode of resistor R3 is connected to the positive electrode of capacitor C9 and the positive electrode of capacitor C6, and the negative electrode is connected to the positive electrode of inductor L12, and the negative electrode of inductor L10, the negative electrode of inductor L11, and the negative electrode of inductor L12 are connected in a star-type neutral point grounding method, and the grounding point is the grounding port GND1.

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