人体防盗报警传感器设计任务书.doc

毕业设计任务书 课题名称 人体防盗报警传感器设计 课题需要完成的任务：可行性方案分析及方案论述。 硬件的框图及电路设计。 各主要器件、单元电路等的选用方案，性能分析及功能介绍。 设计电路的原理图及印制板图绘制。毕业设计小结 课题计划：1.1~1.31 查资料，调研参观，初步方案设计。 2.1~2.20 设计最佳方案； 2.21~3.31 设计电路，绘制电路，写毕业论文。 4.1~4.15 修改、完善毕业论文，并做答辩准备。 计划答辩时间：4.16~4.19 电子信息技术 系（部、分院） 200 年 月 日 ?英文 About The Switching Power Supply Technology In the electric power electronic technology application and in each kind of electrical power system, the switching power supply technology is at the core position. Mentions the analogous circuit this noun, perhaps many people will feel strange，but you certainly have heard the megaphone. When we in big conference site, clearly hears from the speaker to treat the sound which the microphone sends out，the speaker the reason that can make the very big sound，first depends on one kind to be able to make the keen response to the sound sensitive gas. It can transform the sound to the voltage signal，again passes through the enlargement electric circuit，the input signal will turn the high efficiency the output signal. In the speaker makes the very strong sound is not the sound simple expansion .Two is but is with the small input signal，enlarges the electric circuit through the transistor to control the energy size which the power source provides. The big output signal obtains in the output load. There are many types of electrical and electronic power supplies, providing various alternating current AC and direct current DC voltage for equipment operation .DC voltages are needed for most electronic circuits, and generally an electronic power supply is considered as a device that converts AC into DC. The AC voltage from the power lines can be rectified directly or passed through an isolation transformer. Depending on the value of DC voltage needed, the transformer may be of either a step-up or step-down type. After the transformer, the AC is rectified into pulsating DC by diodes in the form of a half-wave rectifier, a full-wave recti