【正文】 無 錫 職 業(yè) 技 術 學 院畢業(yè)設計任務書畢業(yè)設計任務書課題名稱 人體防盜報警傳感器設計 課題需要完成的任務：1. 可行性方案分析及方案論述。2. 硬件的框圖及電路設計。3. 各主要器件、單元電路等的選用方案，性能分析及功能介紹。4. 設計電路的原理圖及印制板圖繪制。5. 畢業(yè)設計小結課題計劃：~ 查資料，調(diào)研參觀，初步方案設計。~ 設計最佳方案；~ 設計電路，繪制電路，寫畢業(yè)論文。~ 修改、完善畢業(yè)論文，并做答辯準備。計劃答辯時間：~ 電子信息技術 系（部、分院） 2008 年 12 月 16 日1無 錫 職 業(yè) 技 術 學 院畢業(yè)設計說明書（英文翻譯） 英文About The Switching Power Supply TechnologyIn 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 stepup or stepdown type. After the transformer, the AC is rectified into pulsating DC by diodes in the form of a halfwave rectifier, a fullwave rectifier, or a bridge fullwave rectifier. The pulsating DC is then filtered or smooth out by capacitors, inductors, and resistors so as to produce a constant DC output. Singphase power what you have in your house. You generally talk about household electrical service as singphase, 220voltAC service. If you use an oscilloscope and look at the power found at a normal wallplate outlet in your house, what you will find is that the power at the wall plate looks like a sine wave, and that wave oscillates between 311volt and 311volt (the peak are indeed at 311 volt。 it is the effective volt that is 220 volt).The rate of oscillation for the sine wave is 50 cycle per second. Oscillating power like this is generally referred to as AC, or alternating current.Regarding largescale electrolysis galvanization power source, the traditional electric circuit extremely huge but is unwieldy ，if uses high opens suddenly closes the power source technology. Its volume and the weight can large scale drop. Moreover may enormously enhance the power source using the efficiency， the economical material， reduces the cost. In electrically operated and frequency conversion cannot leave the switching power supply technology，changes through the switching power supply uses electricity the frequency. Thus achieves nearly in the ideal matching of load and the actuation control. High frequency switching power supply technology. Does each kind of high efficiency switching power supply core technology?The theoretical analysis and the experience indicated. The electrical product transformer, the inductance and the electric capacity volume weight and the power supply frequency square root has the inverse ratio. Therefore when we enhance the frequency from labor frequency 50Hz to 20kHz，Enhances 400 time, The current collector volume weight drops roughly to the labor frequency design5~l0%.Regardless of is the rectification welding it rectification profession the galvanization， the electrolysis， the electrical finishing， the charge， float the charge, the electric power switch on with and so on each kind of directcurrent power supply also may act according to this principle to carry on the transformation，Bees the switch transformation class power source. Its main material may save 90% or be higher. Also may the electricity saving 30% or are more. As a result of power electronic device operating frequency upper limit gradually many to use the electron tube originally the traditional high frequency equipment solid state. Brings the remarkable energy conservation，saves water，the frugal material economic efficiency. The modulation has two aspects the meanings，F(xiàn)irst is refers to the power ponent the modulation. Second is refers to the power source unit the modulation. Our mon ponent module, includes a unit， two units， six units until seven units. Including switch ponent and with it counter parallel after flow diode. The materially all belongs to the standard the power module (SPM). Recent panies also install the switch ponent actuation protection circuit to the power module in the intellectualization the power module. Not only reduced entire machine volume, more convenient entire machine design manufacture. In fact, As a result of frequency unceasing the leads wire parasitic inductance， the parasitic capacity influence to be even more a bigger electric stress to the ponent. In order to enhance the system reliability, some manufacturers have developed the power module (ASPM)， It all installs machine nearly all hardware by the chip form to a module Enable between the primary device no longer to have traditional the lead wire module passes through strictly，the reasonable heat，the electricity，the mechanical aspect the optimized perfect region. It is similar in the micro electron the user specialpurpose integrated circuit (ASIC). So long as controls the sof