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Study on Far Field Electromagnetic Radiation Model and Simulation of a Flyback Power Supply

Author: JiKeJian
Tutor: HeJunPing
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Switching Power Supply Far-field electromagnetic radiation Finite Element Simulation RFI forecast
CLC: TN86
Type: Master's thesis
Year: 2011
Downloads: 102
Quote: 0
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Abstract


Switching power supply in the work process will produce a high amplitude , fast changes in the current and voltage , not only will be generated around a strong electromagnetic interference ( EMI ) , but also through the wires of the radiation emitted to the distance out. The far-field electromagnetic radiation often adverse effects be around other radio circuit work properly , could easily lead to the the radiated emission certification test fails . Therefore, the study has important theoretical and practical direct use value of the switching power supply radiation radiation characteristics . The far-field electromagnetic radiation mechanism of a single-ended flyback switching power supply sub- Xin , built a simplified radiation model , and its radiation characteristics , influencing factors and the role of simulation specifically investigated the effects of electromagnetic radiation in the far-field factors and effect. This paper studies the content as follows: ( 1) on the basis of the electronic equipment of far-field electromagnetic radiation interference mechanism Xin , the actual structure of the flyback switching power supply , sub- Xin, the far-field electromagnetic radiation interference emission characteristics and basic mechanism . The high - frequency switching state of the switching tube to produce a high amplitude, fast changes in the voltage, current , which generates a source of electromagnetic radiation emitted by conductor . ( 2 ) identify the impact factor flyback switching power supply far-field electromagnetic radiation , wire placement , wire length, the grid impedance characteristics as well as the ground plane and other factors . Extracted far-field electromagnetic radiation emitted simplified model of a flyback switching power supply , and the use of finite element simulation software Ansoft HFSS 3D simulation model to establish a flyback switching power supply far-field electromagnetic radiation . (3) establishing a model of the far field electromagnetic radiation under different conditions , the simulation to obtain a simulation result of the pattern and the field strength , and stars Xin their different roles on the far field electromagnetic radiation characteristics . (4) The simple excitation conditions , the wire's far-field electromagnetic radiation to be measured, and initial validation of the model and by the comparison of test and simulation . This study helps to help design a few members of the law to recognize the far-field electromagnetic radiation to guide the design of power supply EMI , then reduce the switching power radiated interference emission , to promote the the the early EMc design of the switching power supply .

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