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| 1 | 不同排列的金属球在均匀电场中的仿真研究显示文摘大量研究已证明导线表面状态会极大影响导线的电晕性能,但微观层面上是如何影响电场分布的研究并不充足。因采用均匀电场可以更好地关注颗粒本身相互影响的规律。计算了在平行板电极形成的均匀电场中,不同排列的球状金属颗粒放置在电压极板上的影响,当金属球成一字排列时,随着数量的增多,最大场强值和最大面电荷密度都会被削弱,趋向一极限值,并根据数量-场强曲线拟合了公式。当3颗球一字排列时,中间球正好位于两边球中心时削弱作用最强,且两边球距离越近效果越明显;当金属球按正多边形排列时,数量越多削弱越明显,距离越近削弱越明显。1颗金属球在距离极板不同高度时,金属球靠近但未接触极板时场强最大。计算证明并非金属球越少电场分布越好,为优化导线表面状态、去除瑕疵提供了理论基础。 | 朱杰 伍珈乐 宋绪鹏 卞星明 | 2021 | 中国电力2021，54，5： | 0 |
| 2 | A review of high frequency resonant DC-DC power converters:Topologies and planar magnetic technologies显示文摘With the development of high frequency resonant DC-DC power converters,the system efficiency,power density and dynamic characteristics have been significantly improved.High frequency resonant DC-DC converters have been applied in DC grid,renewable energy,transportation,aerospace,point-of-load(POL)power supply and many other fields.Under high switching frequencies,switching loss and magnetic loss are the main concerns;thus,the resonant topology and planar magnetic are two key technologies to reduce loss.This review compares different resonant topologies and analyzes the advantages and disadvantages respectively,such as LLC circuit,dual active bridge(DAB)circuit,and other high order resonant circuits.For planar magnetic components,optimal winding structures,modeling methods and integration methods are thoroughly surveyed.With corresponding topics,the opportunities and challenges in the future development are summarized,which mainly focus on the characteristics of wide bandgap devices,such as the dynamic resistance,output capacitance loss and also the integrated module.This review can be a helpful guidance when designing high frequency resonant DC-DC converters. | XU DianGuo GUAN YueShi WANG YiJie WANG Wei | 2020 | Science China(Technological Sciences)2020，63，8： | 0 |
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