Lecture 9

Lecture 9 - EEL 5245: Power Electronics I Lecture # 9...

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1 EEL 5245: Power Electronics I Lecture # 9 Non-Isolated Dc-dc Converters School of Electrical Engineering and Computer Science University of Central Florida Insturctor: Dr. Sam Abdel-Rahman
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2 DC-Transformer Model Dc transformer equivalent circuit model by including the converter non- idealities useful when it comes to solving for voltage conversion, average current gain and efficiency. The dc transformer equivalent circuit for a buck converter of Fig. 4.64 is given in Fig. 4.65. Fig 4.64 Buck converter with component nonidealities Fig 4.65 Transformer equivalent circuit diagram for a buck converter Non-idealities
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3 o o on L Q in L V I r r V V t v + = ) ( ) ( o L D o D L I r r V V t v ) ( ) ( + = 0 t<DT DT t<T Under dc condition, the average inductor voltage is zero , = T L dt t v T 0 0 ) ( 1 The above integral yield the following dc equation: [ ] [ ] 0 ) ( ) 1 ( ) ( = + + + o L D o D o on l Q o in I r r V V D I r r V V V D
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Lecture 9 - EEL 5245: Power Electronics I Lecture # 9...

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