Seven power level high voltage frequency converter

Abstract

The invention relates to the technical field of a multiple level high voltage transducer, in particular to a seven level high voltage transducer which is formed by mixing couplet components and a controlling method. The seven level high voltage transducer of the invention comprises a high voltage rectification circuit, a high voltage capacitance filtering circuit, an equalizer circuit and an inversing circuit which are connected in turn, which is characterized in that the inversing circuit is formed into an inverter through adopting one or two components of IGB and IGCT, adopting the inverter with the structure of diode clamping seven level structure, and three bridge arms of the inverter are same. The transducer of the invention can provide a higher differentiate ratio to a low voltage area of signals, obtain a better harmonious wave characteristic, and the transducer can obtain a better output characteristic to the high voltage area, also obtain a high voltage large power output, and simultaneously the transducer has simple control, safety and reliability.

Description

(1) Technical field [0001] The invention relates to the technical field of multi-level high-voltage frequency converters, in particular to a seven-level high-voltage frequency converter composed of hybrid devices and a control method thereof. (2) Background technology [0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power modules directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase it without limit. At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss...

AI Technical Summary

Problems solved by technology

[0002] With the development of modern power electronic devices, their voltage levels continue to increase, but there are still many defects in using high-voltage power modules directly as high-voltage inverters: 1. The higher the withstand voltage level of the device, the higher the du / dt Large, which is not good for the insulation of the motor; 2. The device is limited by the voltage-resistant material, and it is impossible to increase without limit

At present, high-voltage inverters generally use the method of adding a phase-shifting transformer at the input end to solve the problem of insufficient withstand voltage of the device. However, due to the phase-shifting transformer at the input end, the loss of the whole machine is high and the volume is large, which is not conducive to the miniaturization and low-cost of products. Development in the direction of cost and high efficiency

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