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A Design and Study of A Green Mode’s Switching Power Supply

Author: GuoZhongYin
Tutor: GaoFeiYan
School: Nanhua University
Course: Detection Technology and Automation
Keywords: Switching Power Supply Green Mode PWM current- mode PFC Synchronous rectification
CLC: TN86
Type: Master's thesis
Year: 2010
Downloads: 302
Quote: 0
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Abstract


With the rapid growth in demand for the development of science and technology , communications equipment , consumer electronics , and instrumentation equipment switching power supply , the power supply is an important part of the instrumentation , environmental protection switching power supply is the direction of development of the instrumentation and consumer electronics power supply . A variety of electrical extensive use of switching power supply switching power supply works , so further research to improve its reliability , research and development of green -type switching power supply has important practical significance . The so-called green - type switching power supply requirements of energy - saving first , followed by the power on the grid as well as the surrounding equipment can not ( or less ) the pollution and interference . In this thesis, used in notebook computers and instrumentation flyback switching power supply, the stability and accuracy of the switching power supply , dynamic performance , stability margin target , the application of Matlab and PSpice software , in-depth study of the working principle of the switching power supply . Based on its performance and features , design a good frequency characteristics , high linearity , lower output voltage ripple advantages of high efficiency green power . In this thesis, the main components of the switching power supply design module circuit , including PFC, transformers , PWM control technology, synchronous rectification control loop design . Theoretically derived from a linear transfer function model of the control loop of the switching power supply , by analyzing the layout of the pole-zero , to improve the feedback network compensation circuit , so that the system satisfies the three indicators : ( 1) large enough gain to improve the accuracy and stability ; ( 2 rapid change ) to prevent -40dB/10 octave scale gain slope circuit phase , the closed-loop gain of the system frequency characteristic curve slope should be close to 0dB -20dB/10 octave ; ( 3) ensure that the system has a sufficiently large phase margin requirements phase margin greater than 45 ° . Finally, to complete the circuit board production, and chroma6000ATS test and validate the experimental circuit performance indicators . The simulation results show that the performance index of the switching power supply to meet the requirements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply
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