TOPOLOGY FOR SINGLE-QUADRANT TRANSFORMERLESS HIGH-VOLTAGE FREQUENCY CONVERTER

摘要

A topology for a single-quadrant transformerless high-voltage frequency converter. The topology comprises an inductance-capacitance (LC) filter circuit, a high-voltage charging loop, a rectifier circuit, and an inverter circuit. High-voltage power network signals are filtered by the LC filter circuit, and enter the rectifier circuit through the high-voltage charging loop. The rectifier circuit comprises multiple diodes serially connected to form a three-phase non-controllable rectifier system. The rectified direct current (DC) voltage serves as a DC power supply for the inverter circuit. The inverter circuit comprises multiple power units connected in series. An output end of the inverter circuit is connected to an inductor (L). The power unit of the inverter circuit has a half-bridge structure or an H-bridge structure. The topology enables the single-quadrant high-voltage frequency converter to perform high-voltage frequency conversion without the use of a transformer, while greatly reducing the overall volume and cost of the high-voltage frequency converter.