电子测试
電子測試
전자측시
ELECTRONIC TEST
2015年
9期
30-33,16
,共5页
数字式 LLC%宽电压输出%LED恒流源
數字式 LLC%寬電壓輸齣%LED恆流源
수자식 LLC%관전압수출%LED항류원
Digital LLC%wide voltage output LED constant current source
LLC是一种优良的电源转换拓扑，特别在LED模组在向高电压低电流方向发展时，LLC成为了LED驱动非常合适的选择。LLC在宽范围输出电压恒流源设计中存在着挑战，很难兼顾高效率、低的EMI和宽的输出电压范围。数字电源在整体成本、功能可扩展性、可靠性、调光、通信等方面具有明显的优势。本文针对问题提出了新的设计思路，并用数字式的方法去实现了一台200W数字式恒流源样机，在两倍的输出电压范围内实现系统效率94%以上，同时具有良好的EMI性能。
LLC是一種優良的電源轉換拓撲，特彆在LED模組在嚮高電壓低電流方嚮髮展時，LLC成為瞭LED驅動非常閤適的選擇。LLC在寬範圍輸齣電壓恆流源設計中存在著挑戰，很難兼顧高效率、低的EMI和寬的輸齣電壓範圍。數字電源在整體成本、功能可擴展性、可靠性、調光、通信等方麵具有明顯的優勢。本文針對問題提齣瞭新的設計思路，併用數字式的方法去實現瞭一檯200W數字式恆流源樣機，在兩倍的輸齣電壓範圍內實現繫統效率94%以上，同時具有良好的EMI性能。
LLC시일충우량적전원전환탁복，특별재LED모조재향고전압저전류방향발전시，LLC성위료LED구동비상합괄적선택。LLC재관범위수출전압항류원설계중존재착도전，흔난겸고고효솔、저적EMI화관적수출전압범위。수자전원재정체성본、공능가확전성、가고성、조광、통신등방면구유명현적우세。본문침대문제제출료신적설계사로，병용수자식적방법거실현료일태200W수자식항류원양궤，재량배적수출전압범위내실현계통효솔94%이상，동시구유량호적EMI성능。
The LLC is a kind of high power converter topology, especially, with the growing trend of the LED module be in high voltage & low current. LLC has become a very appropriate choice of LED driver. The challenge exist in LLC design of wide voltage output constant current source , it is difficult to give attention to both high efficiency and low EMI and wide range of output voltage. Digital power supply with distinct advantage regarding as the overall cost, functionality, scalability, reliability, dimmer, the communication etc.This paper aims to put forward the new design concept of problem solving. A 200w prototype digital constant current source approached with digital processing, and 94% up system efficiency reached within twice as output of the voltage, as well as a good EMI performance fulfilled.
