Lecture 8 - EEL 5245: Power Electronics I Lecture # 8...

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1 EEL 5245: Power Electronics I Lecture # 8 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 THE EFFECTS OF CONVERTER NON-IDEALITIES The analysis thus far has been based on the assumption that all components, switching devices and diodes are ideal. Study the second-order non-ideal effects on the output voltage and efficiency. The following non-ideal characteristics will be investigated: (1) Inductor resistance (r L ), (2) Transistor and diode voltage drops (V Q , V D ), (3) Switching and conduction losses (r sw ). Other non-idealities is the equal series resistance of the output capacitor, r ESR . Correction: Reverse the polarity of the diode voltage drop
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3 Inductance Resistance The buck converter: Buck converter with inductor resistance Inductor current including r L Non-idealities I II V R o LL o = + = min max 2 The voltage gain, V V D r R o in L = + 1 When r L 0, the gain becomes D.
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This note was uploaded on 10/05/2010 for the course EEL 5245 taught by Professor Abdel-rahman during the Fall '10 term at University of Central Florida.

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Lecture 8 - EEL 5245: Power Electronics I Lecture # 8...

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