Automatic homogeneous flow technology for connecting diodes in parallel

Abstract

A device goes wrong easily when a diode in a converter loads a heavy current and is switched in high frequency in heavy current workplaces, therefore, a plurality of diodes are connected in parallel so as to achieve the purpose of expanding current capacity. Because of the negative temperature characteristic of the diode, a whole expanded power system cannot be completely ensured to work stably and reliably only through a simple parallel connection mode. The stability and the reliability of the whole expanded power system are greatly influenced if the problem of homogeneous flow of the diode is solved with different methods. The invention provides a solution of the homogeneous flow problem of the plurality of diodes connected in parallel and applied to a heavy current converter topology; one diode is connected in series before the diodes are connected in parallel; and two ends of the series connected diode are connected by using an inductive connecting wire with a resistor so as to achieve the automatic homogeneous flow effect and solve the problem of unbalance currents of the diodes connected in parallel. A circuit is characterized in that a main circuit is the converter topology, the plurality of diodes are connected in parallel and shunted, and the original diode is replaced by the diode which is connected in series in front of each diode, wherein two ends of the diode are connected by using the inductive connecting wire with the resistor.

Description

technical field [0001] The invention relates to a method for realizing automatic current sharing under the condition that multiple diodes are connected in parallel in the topology of a high-current converter, and belongs to medium and high-power DC technology in power conversion. Background technique [0002] At present, high-current and high-voltage output DC converters are applied to various fields such as communication power supplies, alkali metallurgical industry, and aerospace power systems. In order to improve the efficiency and reliability of the converter, there are many researches on the topological current sharing problem of the high-current output DC converter. [0003] Due to the limitations of semiconductor technology and device manufacturing technology, it is difficult to break through the voltage and current levels of a single diode. Therefore, how to further expand the capacity of the circuit based on the current device capacity level has become an important ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of unbalanced current in each shunt branch when there are multiple diodes connected in parallel in the traditional converter, and proposes an automatic current sharing method for multiple diodes connected in parallel in the topology of a large current converter to solve large High power switching frequency, current sharing problem in high current and high voltage output occasions

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