Inverter soft switching circuit

Abstract

The utility model belongs to the technical field of inverters, and particularly discloses an inversion soft switching circuit, which comprises a power supply module, a soft switching module, a three-level inversion module, a switching tube driving module, a load module and a display module, the output end of the soft switch module is connected with the input end of the three-level inversion module, the output end of the three-level inversion module is respectively connected with the input end of the display module and the input end of the load module, and the output end of the switch tube driving module is connected with the control end of the three-level inversion module. According to the utility model, the soft switching module is connected to the input end of the three-level inversion module, so that the voltage spike and loss of a switching tube are reduced, the working efficiency is improved, and the corresponding output in the inversion process can be checked conveniently, and therefore, the response condition can be adjusted and analyzed in time. The utility model is suitable for the inverter.

Description

Technical Field

[0001] This utility model belongs to the field of inverter technology, specifically an inverter soft-switching circuit. Background Technology

[0002] An inverter is a converter that transforms direct current (DC) power into alternating current (AC) power with fixed frequency and voltage or adjustable frequency and voltage. With the rapid development of power electronic devices, inverter control technology has also continuously improved. Three-level inverters, due to their advantages such as low current harmonics, low switching stress, and low voltage variability, are increasingly being used in medium- and high-voltage, high-capacity speed control systems. However, MOSFETs and fast recovery diodes are key components. In practical inverter applications, significant switching losses occur during the turn-off and turn-on periods of MOSFETs, particularly under high voltage and high current conditions. This limits the increase in switching frequency, resulting in low efficiency and making it inconvenient to monitor the output during the inverter process. Utility Model Content

[0003] The purpose of this invention is to provide an inverter soft-switching circuit to reduce inverter switching losses, increase switching frequency, improve efficiency, and facilitate viewing of the corresponding output during the inverter process, thereby enabling timely adjustments and analysis of the response status.

[0004] To achieve the above objectives, the technical method adopted by this utility model is as follows:

[0005] An inverter soft-switching circuit is characterized by comprising a power supply module, a soft-switching module, a three-level inverter module, a switching transistor driver module, a load module, and a display module. The output terminal of the power supply module is connected to the input terminal of the soft-switching module, the output terminal of the soft-switching module is connected to the input terminal of the three-level inverter module, the output terminal of the three-level inverter module is connected to the input terminals of the display module and the load module, respectively, and the output terminal of the switching transistor driver module is connected to the control terminal of the three-level inverter module.

[0006] As a limitation: the soft-switching module includes a resonant inductor, a resonant capacitor, a main switch, an auxiliary switch, a first zero-ohm resistor, a first diode, and a second diode. The positive terminal of the power supply module is connected to one end of the main switch, one end of the resonant capacitor, and one end of the resonant inductor, respectively. The other end of the resonant inductor is connected to one end of the auxiliary switch and one end of the first zero-ohm resistor, respectively. The other end of the first zero-ohm resistor, the other end of the auxiliary switch, the other end of the resonant capacitor, and the other end of the main switch are all connected to the negative terminals of the first and second diodes. The negative terminals of the first and second diodes are both connected to the three-level inverter module. The positive terminals of the first and second diodes are both connected to the positive terminal of the power supply module and the three-level inverter module.

[0007] As a limitation: the three-level inverter module includes a first capacitor, a second capacitor, and six bridge arms. The first bridge arm includes a first switch, a second switch, and a third diode; the second bridge arm includes a third switch, a fourth switch, and a fourth diode; the third bridge arm includes a fifth switch, a sixth switch, and a fifth diode; the fourth bridge arm includes a seventh switch, an eighth switch, and a sixth diode; the fifth bridge arm includes a ninth switch, a tenth switch, and a seventh diode; and the sixth bridge arm includes an eleventh switch, a twelfth switch, and an eighth diode. One end of the first capacitor is connected to the soft-switching module and the source of the first switch, respectively. The source of the third switch transistor and the source of the fifth switch transistor are connected. The other end of the first capacitor is connected to one end of the second capacitor, the anode of the third diode, the cathode of the sixth diode, the anode of the fourth diode, the cathode of the seventh diode, the anode of the fifth diode, and the cathode of the eighth diode. The other end of the second capacitor is connected to the soft-switching module, the drain of the eighth switch transistor, the drain of the tenth switch transistor, and the drain of the twelfth switch transistor. The drain of the first switch transistor is connected to the cathode of the third diode and the drain of the second switch transistor. The drain of the second switch transistor is connected to the source of the seventh switch transistor, the display module, and the load module. The drain of the seventh switch is connected to the anode of the sixth diode and the source of the eighth switch, respectively. The gates of the first and second switches are connected and connected to the switch driver module. The gates of the seventh and eighth switches are connected and connected to the switch driver module. The drain of the third switch is connected to the cathode of the fourth diode and the source of the fourth switch, respectively. The drain of the fourth switch is connected to the source of the ninth switch, the display module, and the load module, respectively. The drain of the ninth switch is connected to the anode of the seventh diode and the source of the tenth switch, respectively. The gates of the third and fourth switches are connected to each other. The gates of the ninth and tenth switches are connected to the switching transistor drive module. The drain of the fifth switch is connected to the cathode of the fifth diode and the source of the sixth switch. The drain of the sixth switch is connected to the source of the eleventh switch, the display module, and the load module. The drain of the eleventh switch is connected to the anode of the eighth diode and the source of the twelfth switch. The gates of the fifth and sixth switches are connected to the switching transistor drive module. The gates of the eleventh and twelfth switches are connected to the switching transistor drive module.

[0008] As a limitation: the load module includes a first resistor, a second resistor, a third resistor, a first inductor, a second inductor, and a third inductor. One end of the first resistor, one end of the second resistor, and one end of the third resistor are all connected to the three-level inverter module. The other end of the first resistor is connected to one end of the first inductor, the other end of the second resistor is connected to one end of the second inductor, the other end of the third resistor is connected to one end of the third inductor, and the other ends of the first inductor, the second inductor, and the third inductor are connected together.

[0009] As a limitation, it also includes a second zero-ohm resistor and a third zero-ohm resistor. One output of the soft-switching module is connected to one input of the three-level inverter module through the second zero-ohm resistor, and the other output of the soft-switching module is connected to the other input of the three-level inverter module through the third zero-ohm resistor.

[0010] As a limitation: the display module includes a power measurement unit and an OLED display screen. The input terminal of the power measurement unit is connected to the output terminal of the three-level inverter module, and the output terminal of the power measurement unit is connected to the OLED display screen.

[0011] The beneficial effects achieved by this utility model, due to the adoption of the above-mentioned solution, compared with the prior art, are as follows:

[0012] This invention provides an inverter soft-switching circuit. A soft-switching module is connected to the input of a three-level inverter module. When the switch in the soft-switching module is turned off, resonance occurs between the resonant inductor and the resonant capacitor. The voltage and current waveforms in the circuit resemble a half-sine wave, mitigating voltage and current changes during switch-off, reducing switching losses and noise, lowering voltage spikes and losses in the switching transistor, and improving the overall efficiency and reliability of the inverter circuit. A power measurement unit is connected to the output of the three-level inverter module to transmit data to an OLED display, facilitating the viewing of the corresponding output during the inverter process and enabling timely adjustments and analysis of the response. The soft-switching module uses a more precisely coupled resonant inductor and a more voltage-resistant resonant capacitor, resulting in greater adaptability and compatibility with the inverter circuit. Furthermore, a zero-ohm resistor is used to isolate the soft-switching module and the three-level inverter module, effectively isolating signal interference between the two modules.

[0013] This invention applies to inverters. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a circuit diagram of an inverter soft-switching circuit according to an embodiment of the present invention;

[0016] In the diagram: 1. Soft switching module; 2. Three-level inverter module; 3. Load module; 4. Display module. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments. However, those skilled in the art should understand that the present invention is not limited to the following embodiments. Any improvements and equivalent changes made based on the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0018] An Inverter Soft Switching Circuit (Example)

[0019] An inverter soft-switching circuit includes a power supply module, a soft-switching module, a three-level inverter module, a switching transistor driver module, a load module, and a display module. The display module includes a power measurement unit and an OLED display screen. The output terminal of the power supply module is connected to the input terminal of the soft-switching module. One output terminal of the soft-switching module is connected to one input terminal of the three-level inverter module through a second zero-ohm resistor R02. The other output terminal of the soft-switching module is connected to the other input terminal of the three-level inverter module through a third zero-ohm resistor R03. The output terminals of the three-level inverter module are connected to the input terminals of the power measurement unit and the load module, respectively. The output terminal of the power measurement unit is connected to the OLED display screen. The output terminal of the switching transistor driver module is connected to the control terminal of the three-level inverter module.

[0020] like Figure 1As shown, the soft-switching module includes a resonant inductor Lr1, a resonant inductor Cr1, a main switch S, an auxiliary switch S1, a first zero-ohm resistor R01, a first diode D1, and a second diode D2. The main switch S and the auxiliary switch S1 are switching transistors, controlled by a switching transistor drive module. The three-level inverter module includes a first capacitor C1, a second capacitor C2, and six bridge arms. The first bridge arm includes a first switching transistor MOS1, a second switching transistor MOS2, and a third diode D3. The second bridge arm includes a third switching transistor MOS3, a fourth switching transistor MOS4, and a fourth diode D4. The third bridge arm includes a fifth switching transistor MOS5, a sixth switching transistor MOS6, and a seventh switching transistor MOS7. The fourth bridge arm includes the seventh switch MOS7, the eighth switch MOS8, and the sixth diode D6; the fifth bridge arm includes the ninth switch MOS9, the tenth switch MOS10, and the seventh diode D7; the sixth bridge arm includes the eleventh switch MOS11, the twelfth switch MOS12, and the eighth diode D8; the load module includes the first resistor R1, the second resistor R2, the third resistor R3, the first inductor L1, the second inductor L2, and the third inductor L3; the power supply module uses photovoltaic cells, the power measurement unit uses a conventional power measurement chip, and the switch drive module uses a conventional switch drive chip. The positive terminal of the power module is connected to one end of the main switch S, one end of the resonant inductor Cr1, and one end of the resonant inductor Lr1. The other end of the resonant inductor Lr1 is connected to one end of the auxiliary switch S1 and one end of the first zero-ohm resistor R01. The other end of the first zero-ohm resistor R01, the other end of the auxiliary switch S1, the other end of the resonant inductor Cr1, and the other end of the main switch S are all connected to the negative terminals of the first diode D1 and the second diode D2. The negative terminals of the first diode D1 and the second diode D2 are all connected to one end of the second zero-ohm resistor R02. The positive terminals of the first diode D1 and the second diode D2 are all connected to the positive terminal of the power module and one end of the third zero-ohm resistor R03.The other end of the second zero-ohm resistor R02 is connected to one end of the first capacitor C1, the source of the first switching transistor MOS1, the source of the third switching transistor MOS3, and the source of the fifth switching transistor MOS5, respectively. The other end of the first capacitor C1 is connected to one end of the second capacitor C2, the anode of the third diode D3, the cathode of the sixth diode D6, the anode of the fourth diode D4, the cathode of the seventh diode D7, the anode of the fifth diode D5, and the cathode of the eighth diode D8, respectively. The other end of the second capacitor C2 is connected to one end of the third zero-ohm resistor R03, the drain of the eighth switching transistor MOS8, the drain of the tenth switching transistor MOS10, and the drain of the twelfth switching transistor MOS12, respectively. The drain of MOS1 is connected to the cathode of the third diode D3 and the drain of the second switch MOS2. The drain of the second switch MOS2 is connected to the source of the seventh switch MOS7, the first input terminal of the power measurement unit, and one end of the first resistor R1. The drain of the seventh switch MOS7 is connected to the anode of the sixth diode D6 and the source of the eighth switch MOS8. The gate of the first switch MOS1 and the gate of the second switch MOS2 are connected and connected to the first control terminal a0 of the switch drive module. The gates of the seventh switch MOS7 and the eighth switch MOS8 are connected and connected to the fourth control terminal d0 of the switch drive module. The drain of S3 is connected to the cathode of the fourth diode D4 and the source of the fourth switching transistor MOS4. The drain of the fourth switching transistor MOS4 is connected to the source of the ninth switching transistor MOS9, the second input terminal of the power measurement unit, and one end of the second resistor R2. The drain of the ninth switching transistor MOS9 is connected to the anode of the seventh diode D7 and the source of the tenth switching transistor MOS10. The gate of the third switching transistor MOS3 is connected to the gate of the fourth switching transistor MOS4 and is connected to the second control terminal b0 of the switching transistor drive module. The gate of the ninth switching transistor MOS9 and the gate of the tenth switching transistor MOS10 are connected to the fifth control terminal e0 of the switching transistor drive module. The fifth switching transistor MOS3... The drain of S5 is connected to the cathode of the fifth diode D5 and the source of the sixth switch MOS6. The drain of the sixth switch MOS6 is connected to the source of the eleventh switch MOS11, the third input terminal of the power measurement unit, and one end of the third resistor R3. The drain of the eleventh switch MOS11 is connected to the anode of the eighth diode D8 and the source of the twelfth switch MOS12. The gate of the fifth switch MOS5 and the gate of the sixth switch MOS6 are connected and connected to the third control terminal c0 of the switch drive module. The gate of the eleventh switch MOS11 and the gate of the twelfth switch MOS12 are connected and connected to the sixth control terminal f0 of the switch drive module.The other end of the first resistor R1 is connected to one end of the first inductor L1, the other end of the second resistor R2 is connected to one end of the second inductor L2, the other end of the third resistor R3 is connected to one end of the third inductor L3, and the other ends of the first inductor L1, the second inductor L2 and the third inductor L3 are connected together.

[0021] In this embodiment, the inverter soft-switching circuit uses a more efficient and energy-saving photovoltaic cell in the DC power supply, which increases the power supply efficiency and stability. The soft-switching module uses a more precisely coupled resonant inductor Lr1 and a resonant inductor Cr1 with stronger withstand voltage, which makes it more adaptable and compatible with the inverter circuit. At the same time, a zero-ohm resistor is used to isolate the soft-switching module and the three-level inverter module, which isolates the signal interference between the two modules to a certain extent. The switching transistors in the three-level inverter module use high-efficiency MOSFETs with stronger withstand voltage. The switching transistor drive module performs phase lag timing drive on the six bridge arms. In the soft-switching module, resonance occurs between the resonant inductors Lr1 and Cr1 after the switch is turned off. The voltage and current waveforms in the circuit resemble a half-sine wave, which alleviates voltage and current changes during the switch-off process, reduces switching losses and noise. Connecting the soft-switching module to the two input terminals of the three-level inverter module reduces voltage spikes and losses in the switching transistors, improving the overall efficiency and reliability of the inverter circuit. Connecting a power measurement unit to the output terminal of the three-level inverter module transmits data to an OLED display, facilitating the viewing of the corresponding output during the inverter process, thereby enabling timely adjustments and analysis of the response status.

Claims

1. An inverter soft-switching circuit, characterized in that, It includes a power supply module, a soft-switching module, a three-level inverter module, a switching transistor driver module, a load module, and a display module. The output terminal of the power supply module is connected to the input terminal of the soft-switching module, the output terminal of the soft-switching module is connected to the input terminal of the three-level inverter module, the output terminal of the three-level inverter module is connected to the input terminals of the display module and the load module, respectively, and the output terminal of the switching transistor driver module is connected to the control terminal of the three-level inverter module.

2. The inverter soft-switching circuit according to claim 1, characterized in that, The soft-switching module includes a resonant inductor, a resonant capacitor, a main switch, an auxiliary switch, a first zero-ohm resistor, a first diode, and a second diode. The positive terminal of the power supply module is connected to one end of the main switch, one end of the resonant capacitor, and one end of the resonant inductor, respectively. The other end of the resonant inductor is connected to one end of the auxiliary switch and one end of the first zero-ohm resistor, respectively. The other ends of the first zero-ohm resistor, the auxiliary switch, the resonant capacitor, and the main switch are all connected to the negative terminals of the first and second diodes. The negative terminals of the first and second diodes are both connected to the three-level inverter module. The positive terminals of the first and second diodes are both connected to the positive terminal of the power supply module and the three-level inverter module.

3. An inverter soft-switching circuit according to claim 1 or 2, characterized in that, The three-level inverter module includes a first capacitor, a second capacitor, and six bridge arms. The first bridge arm includes a first switch, a second switch, and a third diode; the second bridge arm includes a third switch, a fourth switch, and a fourth diode; the third bridge arm includes a fifth switch, a sixth switch, and a fifth diode; the fourth bridge arm includes a seventh switch, an eighth switch, and a sixth diode; the fifth bridge arm includes a ninth switch, a tenth switch, and a seventh diode; and the sixth bridge arm includes an eleventh switch, a twelfth switch, and an eighth diode. One end of the first capacitor is connected to the soft-switching module, the source of the first switch, and the third... The source of the first switching transistor is connected to the source of the fifth switching transistor. The other end of the first capacitor is connected to one end of the second capacitor, the anode of the third diode, the cathode of the sixth diode, the anode of the fourth diode, the cathode of the seventh diode, the anode of the fifth diode, and the cathode of the eighth diode. The other end of the second capacitor is connected to the soft-switching module, the drain of the eighth switching transistor, the drain of the tenth switching transistor, and the drain of the twelfth switching transistor. The drain of the first switching transistor is connected to the cathode of the third diode and the drain of the second switching transistor. The drain of the second switching transistor is connected to the source of the seventh switching transistor, the display module, and the load module. The drain of the switching transistor is connected to the anode of the sixth diode and the source of the eighth switching transistor, respectively. The gates of the first and second switching transistors are connected and connected to the switching transistor driver module. The gates of the seventh and eighth switching transistors are connected and connected to the switching transistor driver module. The drain of the third switching transistor is connected to the cathode of the fourth diode and the source of the fourth switching transistor, respectively. The drain of the fourth switching transistor is connected to the source of the ninth switching transistor, the display module, and the load module, respectively. The drain of the ninth switching transistor is connected to the anode of the seventh diode and the source of the tenth switching transistor, respectively. The gates of the third and fourth switching transistors are connected. It is connected to the switching transistor drive module. The gates of the ninth and tenth switching transistors are connected and connected to the switching transistor drive module. The drain of the fifth switching transistor is connected to the cathode of the fifth diode and the source of the sixth switching transistor. The drain of the sixth switching transistor is connected to the source of the eleventh switching transistor, the display module, and the load module. The drain of the eleventh switching transistor is connected to the anode of the eighth diode and the source of the twelfth switching transistor. The gates of the fifth and sixth switching transistors are connected and connected to the switching transistor drive module. The gates of the eleventh and twelfth switching transistors are connected and connected to the switching transistor drive module.

4. An inverter soft-switching circuit according to claim 1 or 2, characterized in that, The load module includes a first resistor, a second resistor, a third resistor, a first inductor, a second inductor, and a third inductor. One end of the first resistor, one end of the second resistor, and one end of the third resistor are all connected to the three-level inverter module. The other end of the first resistor is connected to one end of the first inductor, the other end of the second resistor is connected to one end of the second inductor, and the other end of the third resistor is connected to one end of the third inductor. The other ends of the first inductor, the other ends of the second inductor, and the other ends of the third inductor are connected together.

5. An inverter soft-switching circuit according to claim 1 or 2, characterized in that, It also includes a second zero-ohm resistor and a third zero-ohm resistor. One output of the soft-switching module is connected to one input of the three-level inverter module through the second zero-ohm resistor, and the other output of the soft-switching module is connected to the other input of the three-level inverter module through the third zero-ohm resistor.

6. An inverter soft-switching circuit according to claim 1 or 2, characterized in that, The display module includes a power measurement unit and an OLED display screen. The input terminal of the power measurement unit is connected to the output terminal of the three-level inverter module, and the output terminal of the power measurement unit is connected to the OLED display screen.

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