CAJ | 학술논문

针对传统模拟电源在轻载时损耗较大、效率较低的缺陷，提出了一种基于DSP的PI控制的数字电源设计方法．通过对谐振变换器工作原理、Burst模式工作原理和增益特性曲线等的分析，设置了最佳死区时间，提出了数字控制的Burst模式控制策略，可有效改变轻载模式下的开关频率，从而使得谐振变换器在轻载时也能够实现ZVS ，并减少了变换器关断和传输损耗．实验结果表明：设置合理死区时间的变换器在小于5％额定负载时，其效率能达到87％以上；在5％～20％额定负载时，能够保持93％及以上的效率．Burst控制策略下谐振变换器的有效性和可行性通过仿真和样机实验得到了验证．
침대전통모의전원재경재시손모교대、효솔교저적결함，제출료일충기우DSP적PI공제적수자전원설계방법．통과대해진변환기공작원리、Burst모식공작원리화증익특성곡선등적분석，설치료최가사구시간，제출료수자공제적Burst모식공제책략，가유효개변경재모식하적개관빈솔，종이사득해진변환기재경재시야능구실현ZVS ，병감소료변환기관단화전수손모．실험결과표명：설치합리사구시간적변환기재소우5％액정부재시，기효솔능체도87％이상；재5％～20％액정부재시，능구보지93％급이상적효솔．Burst공제책략하해진변환기적유효성화가행성통과방진화양궤실험득도료험증．
To solve the disadvantages of traditional anlog power supply loss and less efficient , the scheme of digital PI control based on the DSP is proposed .A new Burst‐mode control strategy based on digital control is proposed and adjustable dead time is settled by the princi‐ple of LLC resonant converter and Burst‐mode and the analysis of gain curves ,which can im‐prove the switching frequency at light load condition ,ZVS can be achieved ,meanw hile ,the converter switching and transmission loss is reduced ,and the light load efficiency is im‐proved .The resuls show that set the reasonable dead time under 5% load condition ,the effi‐ciency reaches 87 percent ,and in 5% ~20% load condition ,the efficiency is higher than 93 percent .The performance of Burst‐mode control scheme of LLC converter is verified by sim‐ulation and experimental results .