关键词: 磁缓冲器, 铁基纳米晶软磁合金, B-H 曲线, 磁谱

Abstract: In the design of the core snubber system for the 200kV high voltage deck of radio frequency negative ion source, the overheating of the resistor in the secondary DC bias circuit during system operation is solved by the bypass resistor for the first time. The main working frequency of the core snubber system in the HVPS (high voltage power supply) start-up stage (case I) and the breakdown between the electrodes of negative ion source (case II) is analyzed. Under the working frequency corresponding to case I, the B-H curve and dynamic characteristics of the FINEMET magnetic core in the core snubber system are tested. The amplitude permeability decreases by 60% ( at 200Hz) ~80% ( at 100Hz) after adding DC bias. Under the main frequency corresponding to case II, the complex initial permeability of the magnetic core is tested, and the energy storage and energy consumption are analyzed. In the frequency range of 25~525kHz, its magnetic spectrum and the curve of the quality factor with frequency are measured and obtained. As the frequency increases, the energy storage per unit energy consumption of the magnetic core gradually decreases; when the frequency reaches above 100kHz, the energy storage and dissipation state of the magnetic core tends to stabilize. 

Key words: Core snubber, FINEMET, B-H curve, Magnetic spectrum