60W(12V5A)单端反激电源设计毕业设计.doc

摘 要 随着电力电子技术的高速发展，电力电子设备与人们的工作、学习和生活的关系日益密切，而此类设备都离不开可靠的电源。开关电源是近年来应用非常广泛的一种新式电源，它具有体积小、重量轻、效率高、发热量低、使用方便、性能稳定等优点，而且已逐渐取代传统线性电源。在邮电通信、航空航天、仪器仪表、工业设备、医疗器械、家用电器等领域应用效果显著，进一步促进了开关电源技术的迅速发展。目前，开关电源正朝着集成化、智能化、模块化的方向发展。 本文简述了一个60W反激式开关电源的设计过程。该电源通过将输入的交流电压经过滤波、PWM控制、功率变换和稳压控制等电路的处理，得到一个60W的直流输出。该电源具有短路保护、过流保护、反馈补偿等保护电路，增强了电源工作的安全性和可靠性。其中PWM控制模块最为关键，它主要通过控制脉冲电压的占空比来控制反激变压器的开通与关断，从而得到所需输出电压的目的。整个电源采用必威体育精装版的电路设计，具有结构紧凑、性能可靠、输入电压范围宽、输出效率高等优点。 关键词：开关电源；PWM控制；功率变换；反激变换；保护电路 Abstract With the rapid development of power electronic technology, the power electronic equipments and peoples work, study and life move ever closer together, and these devices are inseparable from reliable power supply. The switching power supply which is widely applied in recent years is a new power supply, it has advantages like small volume, light weight, high efficiency, low calorific value, convenient usage, stable performance, and has advantages of substituting the traditional linear power. At post and telecommunications, aerospace, instruments, industrial equipment, medical equipment, household appliances, etc application effect of switching power supply is significantly, and it has promoted the rapid development of swithing power supply. At present, switching power supply is improving toward to integration, intelligent and modular direction. This paper introduces a 60W flyback type switch power supply design process. It input ac voltage，with filtering, PWM control, power transformation and the voltage control circuit, then output dc 60W. This power with short circuit protection, over current protection, feedback compensation protection circuit, strengthened the power work safety and reliability. Among them, the most key is PWM control module, which is mainly achieved by controling the duty cycle of pulse voltage to control transformer open and shut off, and it’s required for the purpose of the output voltage. The power source adopts the latest circuit design, with compact structure, reliable perform