CAJ | 학술논문

LLC谐振半桥变换器可以在全电压范围内、全负载条件下使得初级端 MOSFET实现ZVS(零电压开关)，次级整流二极管实现ZCS(零电流开关)，减少了开关损耗，大大提高了效率。而且在输入电压和负载范围变化比较大的情况下，其开关频率变化较小，有利于主参数的设计。这种变换器通常应用在高频功率变换领域。文中首先使用 FHA(基波近似原理)进行 LLC谐振半桥变换器的建模，然后分析了如何对变换器中的电气参数进行选择，最后设计了一个工作在70~150 kHz频率下300 W的 LLC谐振变换器。
LLC해진반교변환기가이재전전압범위내、전부재조건하사득초급단 MOSFET실현ZVS(령전압개관)，차급정류이겁관실현ZCS(령전류개관)，감소료개관손모，대대제고료효솔。이차재수입전압화부재범위변화비교대적정황하，기개관빈솔변화교소，유리우주삼수적설계。저충변환기통상응용재고빈공솔변환영역。문중수선사용 FHA(기파근사원리)진행 LLC해진반교변환기적건모，연후분석료여하대변환기중적전기삼수진행선택，최후설계료일개공작재70~150 kHz빈솔하300 W적 LLC해진변환기。
LLC resonant half bridge power converter can regulate output over wide line and load variation with a rela-tively small variation of switch frequency,while maintaining excellent efficiency.It can achieve zero voltage switching (ZVS)over the entire operating range.It usually used in high power converter region.This paper firstly use first harmonic approximation(FHA)to develop the input-to-output voltage-transfer function.Then it analyzed the selection of electric pa-rameter.Finally,we designed a 300 W LLC converter working at 70~150 kHz.