夕卜文出处： Farhadi, A. (2008). Modeli ng, simulatio n, and reducti on of con ducted electromag netic in terfere nee due to a pwm buck type switch ing power supply. Harmonics and Quality of Power, 2008. ICHQP 2008. 13th In ternatio nal Co nference on, 1 - 6.
Modeling, Simulation, and Reduction of Conducted Electromagnetic
Interference Due to a PWM Buck Type Switching Power Supply I
A. Farhadi
Abstract:Un desired gen erati on of radiated or con ducted en ergy in electrical systems is called Electromagnetic Interferenee (EMI). High speed switching frequency in power electronics con verters especially in switch ing power supplies improves efficie ncy but leads to EMI. Differe nt kind of con ducted in terfere nee, EMI regulati ons and con ducted EMI measureme nt are in troduced in this paper. Compliancy with national or international regulation is called Electromagnetic Compatibility (EMC). Power electronic systems producers must regard EMC. Modeling and simulation is the first step of EMC evaluation. E
MI simulation results due to a PWM Buck type switching power supply are prented in this paper. To improve EMC, some techniques are in troduced and their effective ness proved by simulati on.
Index Terms :Con ducted, EMC, EMI, LISN, Switchi ng Supply
I. INTRODUCTION
FAST mic on ductors make it possible to have high speed and high freque ncy switch ing in
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power electro nics 1: High speed switch ing caus weight and volume reduction of equipme nt,
2] but some unwan ted effects such as radio freque ncy in terfere nee appeared - . Complia nee with
electromagnetic compatibility (EMC) regulations is necessary for producers to prent their
f] products to the markets. It is important to take EMC aspects already in design pha -
直播段子Modeli ng and simulati on is the most effective tool to an alyze EMC con sideratio n before
developing the products. A lot of the previous studies concerned the low frequency analysis of
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power electronics components 4 5 . Different types of power electronics converters are capable
to be con sidered as source of EMI. They could propagate the EMI in both radiated and con ducted
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forms. Line Impedanee Stabilization Network (LISN) is required for measurement and calculation
of con ducted in terfere nee level | 狗不能吃6 ] '.Interferenee spectrum at the output of LISN is introduced as |
the EMC evaluation criterion | 7 8' .National or international regulations are the references for |
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新能源车辆the evaluation of equipment in point of view of EMC
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II. SOURCE, PATH AND VICTIM OF EMIUn desired voltage or curre nt is called in terfere nee and their cau is called in terfere nee source .In this paper a high-speed switch ing power supply is the source of in terfere nee.
In terfere nee propagated by radiati on in area around of an in terfere nee source or by con ducti on through com mon cabli ng or wiri ng connections. In this study con ducted emissi on is con sidered only. Equipme nt such as computers, receivers, amplifiers, in dustrial con trollers, etc that are expod to in terfere nee corrupti on are called victims. The com mon conn ecti ons of eleme nts, source lines and cabli ng provide paths for con ducted no i or in terfere nee. Electromag netic con ducted in terfere nee has two comp onents as differe ntial mode and com mon mode 91
A. Differe ntial mode con ducted in terfere nee
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Fig 1. Differential mode conducted interference path
This mode is related to the noi that is impod between different lines of a test circuit by a
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noi source. Related current path is shown in Fig. 1 - . The interferenee source, path
impeda nces, differe ntial mode curre nt and load impeda nee are also show n in Fig. 1.
B. Common mode con ducted in terfere nee
Common mode no i or in terfere nee could appear and impo betwee n the lin es, cables or conn ecti ons and com mon gro und. Any leakage curre nt betwee n load and com mon ground could be modeled by in terfere nee voltage source.
Fig. 2 dem on strates the com mon mode in terfere nee source, com mon mode eurre nts I ” and em1
Icm2梦到自己生了孩子 and the related current paths9】. The power electronics converters perform as noi source betwee n lines of the supply n etwork. In this study differe ntial mode of con ducted in terfere nee is particularly important and discussion will be continued considering this mode only.
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