A High Power Density AC Large Current Generator

Abstract

The invention discloses a high-power-density alternating-current strong current generator. According to the generator, a power electronic technology is provided for being used for achieving high-current adjustable output, power density and the power factor can be greatly improved, automatic high-precision adjustment can be achieved, carrying and use are convenient, the service life is prolonged, and reliability is improved. A three-level structure is adopted, a Boost PFC is arranged on the first level, an LLC is arranged on the second level, and an interleaving full-bridge inverter is arranged on the third level. The first level is mature in technology. The second level is high in input voltage, low in output voltage and high in current, and the structure that the primary sides of multiple transformers are connected in series, and secondary sides are connected in parallel is adopted. The third level belongs to low-voltage input and lower-voltage high-current output, output current waveform quality is guaranteed through a carrier staggering method, and the conversion efficiency of the convertor on this level is improved.

Description

technical field [0001] The invention relates to a high power density alternating current large current generator, which belongs to the technical field of power electronic converters. Background technique [0002] The detection / calibration of large current transformers needs to provide a large current source of 50HZ (such as 0-500A adjustable). The output voltage of the voltage regulator is used to adjust the output current. This method has the following disadvantages: (1) manual adjustment is inconvenient to use; (2) large volume and weight (500A weighs tens of kilograms), and it is inconvenient to carry; (3) low reliability; (4) low power factor. It is a development trend to improve the efficiency of the test equipment, reduce the volume and weight, facilitate the use of field testing, and improve the life and reliability of the equipment. The switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of the sw...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) manual adjustment is inconvenient to use; (2) large volume and weight (500A weighs tens of kilograms), and it is not convenient to carry; (3) low reliability; (4) low power factor

As the current increases, the length of the primary wire and the area surrounded by the loop also increase, the equivalent inductance of the loop increases, the reactive power that needs to be provided increases significantly, the power factor decreases, and the required power increases rapidly. On the other hand , due to the large volume and weight of the 50Hz step-down transformer, it is inconvenient to carry

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