人体防盗报警传感器设计毕业设计任务书(编辑修改稿)

人体防盗报警传感器设计毕业设计任务书(编辑修改稿)内容摘要：

ak currents are typically three to five times higher than the average current drawn by the power supply. This causes excessive voltage drop in the wiring and imbalance problems in the three phase delivery system. Also the full energy potential of the AC line is not utilized. A popular method of acplishing this is by using a boost converter prior to the actual power supply. Boostmode supplies exhibit the largest input dynamic range of all the switching power supply topologies. Input voltages down to 30 volts can be boosted to 370 volts on its output (higher than the highest expected peak operating AC crest voltage). The boost power factor correction circuit can be seen in Figure 37 on page 37. The bulk input filter capacitor is now placed on the output of the boost converter. The input capacitor, just following the 50/60 Hz rectify bridge is now less than 1 181。 f. This produces an input voltage waveform to the PFC circuit that has a high level of ripple voltage and the boost converter draws its power directly from the line. Much of the designer’s effort during a switching power supply design is spent in identifying and minimizing the losses within the supply. Some of these losses can also present stresses to the semiconductor power ponents which may affect the long term reliability of the power supply. Knowing where the losses arise and how to control them is important. Most 无 锡 职 业 技 术 学 院 毕业设计说明书（英文翻译） 5 of the losses occur in the power ponents within the switching power supply. The most fragile ponents are the power semiconductors. Identifying the major sources for loss can be as easy as placing a finger on each of the ponents, or measuring the currents and voltages. The electronic technology is the contemporary rapid development discipline， he in the automatic control， the correspondence puter， the domestic electric appliances and so on each domain application is day by day widespread. If turns on other in the simulation electronic circuit input end like to be mad sensitive, wet sensitive， magism sensitive， the photosensitive heat is sensitive， presses and so on sensitively the sensitive unit， the people may manufacture the coal gas alarm apparatus， wet go to， the metal crack detector, the automatic street light controller， the temperature controller， the electron call and so on the equipment. In our daily life uses the telephone， the radio， the electronic toy， the television，are the electronic technology application product. But must pay attention specially， do not let the background picture pete， but desalinated the subject content status. In order to in a lively way cause the slide， to be vivid，we also may insert the movie and the sound. Can express any value information with the graph， Using the graph expressed the value directviewing understands， and may beautify the data, Increases audience39。 s interest. Use linearity chart， cake chart， area chart of the same kind expression data ， originally the quite arid data changes clear ， increased the demonstration draft power greatly. Your mapread one all is makes in PowerPoint， is very attractive. From definition animation， it can cause on the slide the text， the shape， the sound， the image， the graph and other objects has the animation effect， like this may key highlight, the control information flow， and enhancement demonstration draft interest. In under the large scale integrated circuit fast development impetus, is following the electronic design automation EDA technology appearance, we definitely may not need any electric circuit template the electric circuit which at home may design through the programming conforms to us to request to e using the puter, after but will design the electric circuit template will give the electronic factory to produce. The function is more perfect not only using the EDA technical design electric circuit, moreover the electric circuit exterior structure is simpler, the volume very is small even only is a scrap integrated circuit, and such circuit design energy consumption is very small conforms to us pletely to the energy conservation request. The semiconductors within a power factor correction stage have some special requirements. First, the 50/60 Hz rectifiers now have to be ultra fast rectifiers, since fast current pulses are being drawn through them. The boost output rectifier will have to be ultra fast if the boost converter is operating in the continuousmode. The power switch has to clear the diode’s reverse recovery charge. In the discontinuousmode (Pin 200 watts), the output rectifier need not be ultra fast since there is no current flowing through the diode prior to the power switch turning on. Such modern electric power electronic technology is the switching power supply technological development foundation. And it is suitable for the higher turnon frequency along with the new electric power electronic device the electric circuit analysis unceasing appearance. Under traditional application technology, because the switching power supply as a result of the power ponent performance limit the performance to e under the influence. In order to enormously displays each kind of power ponent the characteristic. Causes the ponent performance to start out from opposite directions folio closes the power source performance the influence to reduce to slightly. New power circuit analysis and new control technology. It may cause the power switch work at the zero potential or the zero 无 锡 职 业 技 术 学 院 毕业设计说明书（英文翻译） 6 electric current condition. Thus may the big enhancement operating frequency. Enhance the switching power supply working efficiency. Design the performance fine switching power supply. Efficient conversion of electrical power is being a primary concern to panies and to society as a whole. Switching。