Three-level high-power module structure and power conversion unit

Abstract

The invention provides a three-level high-power module structure. The three-level high power module structure comprises a single-phase circuit in diode clamping three-level topology and a rectangular substrate carrying the single-phase circuit. The single-phase circuit comprises power devices and clamping diodes. The power devices comprise the first power device, the second power device, the third power device and the fourth power device. The clamping diodes comprise the first clamping diode and the second clamping diode. The length direction of the power devices and the length direction of the clamping diodes are the same as that of the rectangular substrate. The centers of the power devices and the centers of the clamping diodes are collinear. In the width direction of the rectangular substrate, the first power device is closely adjacent to the fourth power device, the first clamping diode is closely adjacent to the second clamping diode, and the second power device is closely adjacent to the third power device; in this way, the overall three-level high-power module structure is compact in arrangement, and the size of the three-level high-power module structure is reduced. The invention further provides a power conversion unit which is compact in arrangement and wide in application occasion.

Description

technical field [0001] The invention relates to the field of frequency converters, in particular to a three-level high-power module structure and a power conversion device. Background technique [0002] With the development of my country's economy, the coal mine industry is also developing rapidly. The existing 660V and 1140V voltage inverters are difficult to meet the requirements of coal mine enterprises. The starting torque is not ideal, and the impact on the power grid is affected to a certain extent. It is still relatively large. With the continuous expansion of coal mining enterprises, the working surface is also expanding. The original low-power motor can no longer meet the production requirements of large-scale working surfaces. Only high-power motors can make the working surface work smoothly. Therefore, the demand for high-power, high-voltage, and high-reliability inverters is becoming more and more urgent. [0003] Usually high-power, medium-to-high-voltage invert...

AI Technical Summary

Problems solved by technology

[0003] Usually high-power, medium-to-high-voltage inverter industry adopts a diode-clamped three-level topology circuit structure. In order to meet the high-power output requirements, power devices with higher power levels (such as insulated barrier Bipolar transistor power devices), but power devices with high power levels tend to be larger in size, larger in power consumption, and have higher requirements for heat dissipation and cooling. This is limited for explosion-proof inverters used in coal mines. The space obviously cannot meet the needs of structural configuration and heat dissipation and cooling

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