基于NCP1014的5W電源適配器設計研究與仿真

摘要：為使電源適配器在大電壓范圍內仍能保持高效、穩定運行，采用臨界電流法設計了基于NCP1014的5W恒流恒壓（CCCV）電源適配器，實驗和仿真測得，電源在兩種模式下效率達80%，負載電壓紋波小于0.1A，電流紋波小于0.05A，證明設計方法正確和OrCAD/PSpice仿真可以作為電源設計的輔助工具。 敘詞：恒流恒壓（CCCV） OrCAD/PSPICE 10.5 收斂 瞬態分析 Abstract：In order to make the adapter with effective and stable operation over a wide voltage range, 5W CCCV(constant current constant voltage) adapter based on NCP1014 was designed with the method of the threshold current condition. The efficiency of the power is up to 80% on both continuous and discontinuous conditions with less 0.1A of the voltage ripple and less 0.03A of current ripple given by experiment and simulation.So the method used is right and the result of the simulation of OrCAD/PSpice can be used as an auxiliary tool for power supply design. Keyword：Constant current constant voltage; OrCAD/PSPICE 10.5; convergence; transient analysis