Seven power level variable frequency speed regulator apparatus

Abstract

The invention relates to the technical field of a multiple level high voltage transducer and in particular relates to a simple seven level variable-frequency speed regulating device. The device comprises a high voltage rectification circuit, a high voltage capacitance filtering circuit, a forced equalizer circuit and a high voltage inversing circuit which are connected in turn, which is characterized in that the main controlling components of the inversing circuit adopts IGBT, IGCT or MOSFET and adopts the inverter with the diode clamping seven level structure, and three bridge arms of the inverter are same. The transducer has the advantages that four-quadrant operations can be realized when the form of the rectification circuit and the structure of the inverter circuit are completely same, the arrangement of the forced equalizer circuit is simplified through the force equalizer circuit and an auxiliary power supply, and each clamping potential equalization can be obtained. The whole circuit has simple structure, high operating factor of components, and stability and high reliability of technical indication of the product can be realized without special manufacturing technique.

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 frequency conversion speed regulator device. (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 of the whole machine is high and the volume ...

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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