CAJ | 학술논문

针对模拟电源轻载效率低的缺陷，提出一种基于DSP 的数字电源设计方案。采用数字控制，轻载时，使其工作在Burst模式，极轻载时，通过同步整流管的寄生二极管整流，有效提高了电源轻载效率。分析了移相全桥变换器的工作原理以及Burst模式的工作原理，并设计了数字控制系统和软件系统。最后，通过一台600 W移相全桥DC/DC变换器样机，验证了数字控制的优势。测试数据表明，该数字电源在10%额定负载下效率可达85%，在5%额定负载下效率仍高于70%。
침대모의전원경재효솔저적결함，제출일충기우DSP 적수자전원설계방안。채용수자공제，경재시，사기공작재Burst모식，겁경재시，통과동보정류관적기생이겁관정류，유효제고료전원경재효솔。분석료이상전교변환기적공작원리이급Burst모식적공작원리，병설계료수자공제계통화연건계통。최후，통과일태600 W이상전교DC/DC변환기양궤，험증료수자공제적우세。측시수거표명，해수자전원재10%액정부재하효솔가체85%，재5%액정부재하효솔잉고우70%。
In order to improve the light load efficiency of analog switching power supply,the design of digital power based on DSP is proposed. In light load condition,by using Burst control signals for primary switches( Q1~Q4 ) and in lighter load condition,by closing synchronous rectifier( SR1,SR2) . The light load efficiency is increased remark-ably. The system arithmetic and software design is given in detail based on the principle of phase shifted full bridge and Burst mode. Finally,to verify the perfect performance of digital control,a digital power supply prototype of 600 Watt is made. Its results indicate,in 10 percent load condition,the efficiency reaches 85 percent,and in 5 percent load condition,the efficiency is higher than 70 percent.