Silicon carbide based high-power low-voltage large-current-output direct-current power supply

Abstract

The invention discloses a silicon carbide based high-power low-voltage large-current-output direct-current power supply which comprises an input plug P1, a three-phase EMI (electro-magnetic interference) filter F1, a three-phase air switch K1, a phase-loss detection board B1, a three-phase rectification board B2, a direct-current busbar processing board B3 and a phase-shifting full-bridge board B4. Silicon carbide devices of the power supply are high in switching frequency, low in switching loss, low in conduction resistance R and low in conduction loss, and system efficiency is greatly improved; power density of the power supply is greatly increased by the aid of the silicon carbide devices, a sampling current hall sensor is placed in the middle of four direct-current filter capacitors ina direct-current and output-current sampling circuit, interference value in current sampling can be greatly reduced, and current control accuracy is improved; in addition, in multi-module parallel application, a fuse protector is serially connected to the output side of the circuit so as to prevent the situation that a certain module is infused with large current by other modules when damaged.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to a silicon carbide-based high-power, low-voltage, and high-current output DC power supply. Background technique [0002] During shipping, the uncontrolled discharge of ballast water and sediments from ships leads to the transfer of harmful aquatic organisms between different sea areas, causing marine pollution. The International Convention on the Control and Management of Ships' Ballast Water and Alien Organisms (referred to as the "Ballast Water Convention") is a measure adopted by the International Maritime Organization (IMO) to protect the marine environment. Ballast water treatment means that before the ballast water in the ship is discharged to another water area, the aquatic organisms in its ballast tank must be eliminated. impact on Hong Kong waters. The convention came into effect on September 8, 2017, which means that about 80,000 ships around the world wi...

AI Technical Summary

Problems solved by technology

[0003] For the current marine electrolysis power supply using traditional silicon (Si) devices, including silicon device IGBT and silicon device diodes, due to the slow switching speed of silicon devices and large switching losses, the switching frequency is directly lower. In this way, in order to achieve the corresponding control Performance and voltage and current output effects, lower switching frequency requires larger filter capacitors, filter inductors and isolation transformers and other magnetic devices, which leads to the overall volume and weight of the power supply, low power density, low system efficiency and inconvenient operation Shortcomings

In addition, depending on the size of the ship, different numbers of power modules need to be connected in parallel to meet the ballast water treatment requirements, which greatly increases the volume and weight of the ballast water treatment equipment

Especially when applied on ships, due to the restrictions on the size and weight of the power supply system and the requirements for the convenience of installation, operation and maintenance, the existing electrolysis power supply for ballast water treatment based on Si devices can no longer meet the market demand.

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