《基于TOP_Switch-FX的机顶盒电源设计》-毕业论文（设计）.doc

PAGE SHANDONGＵＮＩＶＥＲＳＩＴＹ　ＯＦ　ＴＥＣＨＮＯＬＯＧＹ 毕业设计说明书 基于TOP Switch-FX的机顶盒电源设计 学 院： 电气与电子工程学院 专 业： 电子信息工程 学生姓名： 学 号： 指导教师： 2011 年 6 月 中 文 摘 要 PAGE I 摘 要 电源是将各种能源转换成为用电设备所需电能的装置，是所有靠电能工作的装置的动力源泉。直流开关电源是一种由占空比控制的开关电路构成的电能变换装置，用于交流—直流或直流—直流电能变换，通常称其为开关电源（Switched Mode Power Supply-SMPS）其功率从零点几瓦到数十千瓦，广泛用于生活、生产、科研、军事等各个领域。开关电源因具有体积小、重量轻、效率高、发热量低、性能稳定等优点而逐渐取代传统技术制造的连续工作电源，被誉为高效节能电源，现己成为稳压电源的主导产品。 开关电源是采用全控型电力电子器件作为开关，利用控制开关的占空比来调整输出电压，主电路采用多路输出单端反激变换器结构，采用控制芯片TOP233Y实现电压电流双闭环控制，采用PC817、TL431等专用芯片以及其他的电路元件相配合作为反馈电路，使设计出的开关电源具有自动稳压功能。系统工作频率在50kHZ，输出6路隔离的电压。 关键词：开关电源，反激式变换器，高频变压器，TOP233Y 目 录 PAGE PAGE \* MERGEFORMAT - 30 - Abstract Power is a device to convert various energy into electric energy. It is the sources of all equipment work by electric. DC switching power supply is a switch circuit controlled by duty ratio. It is used for AC-DC or DC-DC transform and is often called Switched Mode Power Supply(SMPS). Its power varies from a few watts to tens of kilowatts and is widely used in daily life, production, scientific research, military and other fields. With small size, light weight, high efficiency, low heat and stable performance, switching power supply is known as energy efficient power supply, which has become the leading products of regulator. The inverter is composed of flyback converter circuit, high frequency transformer and control circuit. The high-frequency technique makes it possible for the power converter to be compact and light weight. We use TOP233Y as the control chip. To regulate the output voltage automatically, we use PC817, TL431 and other circuit elements match as a feedback circuit. The protection circuits are designed. The frequency of system is 50kHz and it has 6 isolated output voltage. Keywords: switching power supply, flyback converter, high-frequency transformer, TOP233Y 目 录 TOC \o 1-3 \u 摘 要 PAGEREF _Toc295054514 \h I Abstract PAGEREF _Toc295054515 \h II 目 录 PAGEREF _Toc295054