变频空调用新型高性能开关电源的设计

采用单端反激式拓扑,设计了一种基于高性能单片控制芯片TNY-268P的新型开关电源,其中包括开关变压器的设计,具有变频调制、开/关控制和关断时频率抖动等特点。实验结果表明该电源设计具有结构紧凑、成本低、效率高和EMI减轻等优点,可以用于采用隔离或非隔离硬件设计的变频空调等家用电器。     

High efficiency bulk heterojunction organic solar cell by using high conductivity modified PEDOT: PSS as a buffer layer

In this paper,bulk heterojunction solar cells with poly-(3-hexylthiophene)(P3HT):[6,6]-phenyl-C61-butyric-acid-methylester(PCBM) as an active layer and modified poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS) as a buffer layer are fabricated.The buffer layer is modified by adding 1% to 5% dimethyl sulfoxide(DMSO) into PEDOT:PSS solution before spin-coating.The conductivity of modified PEDOT:PSS and the performance of solar cells with modified PEDOT:PSS are measured.The highest conductivity of modified PEDOT:PSS with 4% DMSO can achieve 89.693 S/cm.The performance of organic solar cell with PEDOT:PSS modified by 4% DMSO is the best.The 4% DMSOmodified-PEDOT:PSS cell has a power conversion efficiency of 3.34%,V oc of 5.7 V,J sc of 14.56 mA/cm 2 and filling factor(FF) of 40.34%.     

声孔对耳机频响曲线的影响

利用集中参数系统的电-力-声类比方法,理论分析声孔对耳机频响曲线的影响,并用Micro-Cap软件进行仿真验证,从而指导耳机实际声学设计及调试.