A new double-auxiliary resonant pole type three-phase soft-switching inverter circuit and its modulation method

Abstract

The invention provides a novel dual-auxiliary resonant pole type three-phase soft-switching inverter circuit and a modulation method thereof, which relate to the technical field of power electronics. The circuit includes a three-phase main inverter circuit and a three-phase double auxiliary resonant converter circuit. The main inverter circuit of each phase includes two main switching tubes and two main diodes; the double auxiliary resonant converter circuit of each phase includes four auxiliary switching tubes, two main resonant capacitors, two auxiliary resonant capacitors, and two auxiliary resonant inductor and six auxiliary diodes. The novel double-auxiliary resonant pole-type three-phase soft-switching inverter circuit and its modulation method provided by the present invention complete the simplification of the double-auxiliary resonant commutation circuit and the decoupling of the resonance process, reducing the cost of the inverter circuit and the coupling resonant band The resulting system shock improves the performance and practicability of the inverter circuit. At the same time, the auxiliary resonant capacitor can be fully precharged, so that the output voltage change rate is completely controllable, which fully improves the application environment of the inverter circuit in AC drive applications.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a novel dual-auxiliary resonant pole type three-phase soft-switching inverter circuit and a modulation method thereof. Background technique [0002] Today, the application of power conversion technology is becoming more and more frequent, and the application places of inverters are expanding day by day. Inverters can be seen in fields such as new energy power generation, motor drive, and uninterruptible power supply. With the development of inverters, people's requirements for inverters are getting higher and higher, and inverters with high frequency, miniaturization, and light weight are more and more desired by people, and the introduction of soft switching technology is just in time. Soft switching technology can not only solve the switching loss problem caused by the increase of switching frequency, but also reduce electromagnetic noise (EMC) and electromagnetic int...

AI Technical Summary

Problems solved by technology

However, the auxiliary resonant pole inverter still has shortcomings: the zero-voltage turn-off of the auxiliary switching tube is realized on the premise that the parasitic inductance and parasitic capacitance of the auxiliary resonant converter circuit are zero. Influenced by the parasitic inductance and parasitic capacitance introduced by the line shape, the zero-voltage turn-off condition of the auxiliary switch tube will be destroyed, and reliable zero-voltage turn-off cannot be achieved.

[0006] However, the dual auxiliary resonant converter circuit of the inverter uses many devices, which is too complicated

More devices not only mean the complexity of the inverter circuit and the increase of production cost, but also mean the increase of possible fault points in the actual system, thereby increasing the potential safety hazard of the system; the double auxiliary resonant converter circuit of the inverter There are two groups of resonant components coupled with each other, and the resonant commutation process is coupled with each other, and system oscillation is unavoidable; at the same time, the second group of auxiliary resonant capacitors of the inverter cannot be fully precharged under certain load conditions, resulting in the current The output voltage change rate is uncontrollable, which will bring extremely adverse effects in AC drive occasions

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