1、 毕业设计（论文）报告纸 共 20 页 第 1 页 装 订 线 摘要摘要 1955 年美国的科学家罗那（G.H.Royer）首先研制成功了利用磁芯的饱和来进 行自激振荡的晶体管直流变换器。此后，利用这一技术的各种形式的精益求精直流变 换器不断地被研制和涌现出来，从而取代了早期采用的寿命短、可靠性差、转换效率 低的旋转和机械振子示换流设备。 70 年代以后，与这种技术有关的高频，高反压的功率晶体管、高频电容、开关 二极管、开关变压器的铁芯等元件也不断地研制和生产出来，使无工频变压器开关稳 压电源得到了飞速的发展，并且被广泛地应用于电子计算机、通信、航天、彩色电视 机等领域，从而使无工频变压器开关
2、稳压电源成为各种电源的佼佼者。 真正实现直流 稳压电源效率高，体积小，重量轻的优点。 本课题应用 FAN4803 芯片实现直流电源的升压、降压或负电源的转换，可以选择 一种转换方式进行 DC-DC 开关电源转换并达到电源要求的各项性能指标。设计并制 作设计并制作 240W12V 直流开关电源，该电路可以应用到各类的电子设备和仪器 中。 关键字：直流开关电源、DCDC、FAN4803、电源重量轻、电源效率高。 毕业设计（论文）报告纸 共 20 页 第 2 页 装 订 线 Abstract 1955-U.S. scientists that GHRoyer the first successful
3、 development of the use of core saturation for self-oscillation of the transistor DC converter. Since then, the use of this technology in various forms of excellence DC converter was continually developing and emerging, which replaced the early use of the short life, poor reliability, efficiency and
4、 low rotating mechanical oscillator show converter equipment. After the 1970s, with such technology-related high-frequency, high-pressure power transistor, high-frequency capacitor, switching diodes, switches and other core components of the transformer has been developed and produced, so that no fr
5、equency transformer switching regulator Power has been the rapid development and was widely used in computers, telecommunications, space, color television sets, and other fields, so that no frequency transformer switching power supply has become the leader in power. DC power supply to achieve truly
6、high efficiency, small size, light weight advantages. Application of this issue FAN4803 chip DC power boost, buck or negative power conversion, the conversion can choose a form of DC-DC converters and switching power supply to the power requirements of the various performance indicators. Design and production design and production of 240 W/12V DC
