High-power direct-current power supply

Abstract

The invention provides a high-power direct-current power supply. The high-power direct-current power supply comprises an alternating-current output adjustable circuit, a plurality of rectifying circuits, and a rectification output conversion circuit, wherein the alternating-current output adjustable circuit comprises a voltage regulator and a multi-gear adjustable transformer, and is used for carrying out alternating-current voltage regulation on a three-phase input voltage through the voltage regulator and the multi-gear adjustable transformer so as to obtain different alternating-current voltages of multiple gears; the rectifying circuits are connected with the alternating-current output adjustable circuit, and is used for rectifying the alternating-current voltages and outputting direct-current voltages; and the rectification output conversion circuit is connected with the plurality of the rectifying circuits, so that the plurality of the rectifying circuits can be converted to output the direct-current voltages in a parallel or serial form. In a flexible mode that the ratio of the transformer of a front end is three-gear adjustable, and serial and parallel connections of two groups of rectifiers of a back end can be converted, the output voltage range of the power supply can be continuously adjustable between DC50-DC6,000V, and full-power output of the direct-current powersupply can be achieved under three sets of different voltage grades, so that the high-power direct-current power supply has high cost performance and compatibility.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a high-power DC power supply. Background technique [0002] In view of the high-level requirements of high-voltage IGBT and IGCT devices in the power assessment, if the existing traditional fixed-ratio transformer and single-group diode rectifier are used to realize the requirements, the following disadvantages exist: [0003] 1. The DC voltage adjustment range is not wide, which cannot meet the power assessment voltage requirements of high-voltage devices. When evaluating the power of IGCT devices, the DC voltage is usually required to be above DC5000V, and the output voltage of the traditional DC power supply is generally within DC4000V, which cannot meet the high DC input voltage requirements; [0004] 2. The utilization efficiency of DC power supply capacity is low. Due to the use of a fixed ratio transformer, the DC power supply can achieve full power output only...

AI Technical Summary

Problems solved by technology

[0003] 1. The DC voltage adjustment range is not wide, which cannot meet the power assessment voltage requirements of high-voltage devices

When evaluating the power of IGCT devices, the DC voltage is usually required to be above DC5000V, and the output voltage of the traditional DC power supply is generally within DC4000V, which cannot meet the high DC input voltage requirements;

[0004] 2. The utilization efficiency of DC power supply capacity is low

Due to the use of a fixed ratio transformer, the DC power supply can achieve full power output only when the output is up to DC4000V. At other output voltage points, the output power is linear to the DC output voltage due to the limit of the maximum output current capacity of the transformer. Proportional relationship, in this case, when the DC output is lower than DC4000V, the DC power supply capacity is below the rated output power, resulting in a waste of capacity, and even in some low-voltage output conditions, its capacity cannot meet the test requirements

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