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| LED驱动器|反激|变压器级联|变压器原边串联 |
| HU Chen, WU Xin-ke, PENG Fang-zheng, QIAN Zhao-ming |
| College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract A current sharing two-output quasi-resonant flyback LED driver with two stage transformers was proposed. The primary windings of the 2nd stage transformers were connected in series. In conventional flyback converter with transformer in series, the quasi-resonant control was difficult to realize. The problem was solved by adding the 2nd stage transformer. Quasi-resonant control could realize current sharing instead of power sharing between two outputs. When designing the 2nd stage transformer, the DC bias should be noticed. The estimation of the magnetizing inductor with given output current deviation was presented. The output current deviation could be reduced and the magnetizing inductor could be minimized by paralleling capacitor across the rectifying diodes and utilizing the resonant between capacitor across the rectifying diodes and magnetizing inductor of the 2nd stage transformers. A 100 W two-channel output prototype with 700 mA/channel was built up to verify the theoretical analysis.
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Published: 01 April 2015
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变压器级联的双路均流准谐振反激LED驱动器
提出两级变压器级联,后级多个变压器原边绕组串联的双路均流准谐振反激LED驱动器.通过将多个后级变压器的原边绕组串联,解决了传统的多变压器串联反激变流器中无法利用准谐振控制使电路工作于临界连续模式的问题,也解决了反激变流器将多个变压器串联工作于断续模式时只能实现各路输出功率相等而无法实现各路输出均流的问题.在设计后级变压器时,应考虑后级变压器的直流磁偏.给出根据输出电流偏差要求估算后级变压器励磁电感的方法,提出在二极管两端并联电容.利用该电容与后级变压器励磁电感谐振优化输出电流偏差的设计方法,既能够保证较小的输出电流偏差,还可以减小后级变压器所需的励磁电感,从而减小后级变压器所需磁芯规格,降低成本和损耗.研制一台100 W两路输出反激LED驱动器样机,每路输出700 mA,验证了理论分析的正确性.
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