【正文】 wer 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。s， Said regarding each kind of electric circuit and the system design. The simulation technology is useful. Specially, Such as the print making butut， electromagic patibility (EMC) the question as well as the power factor revises (PFC) and so on the question solution. It can not leave the simulation technology the knowledge. But regarding intellectualized switching power supply. Need to use the puter to control the time. The digitized technology could not leave. The electrical power system green has two meanings. First is the remarkable electricity saving， This meant generating capacity economy. But generates electricity is causes the environmental pollution the important reason. Therefore the electricity saving may 無 錫 職 業(yè) 技 術(shù) 學(xué) 院 畢業(yè)設(shè)計說明書（英文翻譯） 4 reduce to the environment pollution. Next these power sources cannot (or are few) have the pollution to the electrical work. The international electrician mittee (IEC) has formulated a series of standards regarding， IEC917， IECl000 and so on. In fact， many powers electrons electricity saving equipment. Often it can turn to the electrical work source of pours into the serious higher harmonic current to the electrical work, causes the total output factor to drop, result of the electrical work voltage coupling many burrs peaks. Even appears lacks the angle and the distortion in 20 century39。 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 無 錫 職 業(yè) 技 術(shù) 學(xué) 院 畢業(yè)設(shè)計說明書（英文翻譯） 3 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， First 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 software to read in this module the fixes the entire module on the corresponding radiator. Thus it can be seen. The modular goal not only lies in the easy to operate, but reduces the entire machine volume. Cancels the traditional segment more the parasitic parameter to the electric stress which withstands the ponent falls to lowest. Moreover, high efficiency switching power supply, because the ponent capacity limit and the increase redundancy enhance the reliable aspect the many independent modules unit parallel work generally. Uses flows the technology. All modules share the load current together. Once some module expiration other modules equally share the load current again. Th