472 Lecture 5 Boost converter

472 Lecture 5 Boost converter - Lecture 5 Steady state...

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Lecture 5 Steady state analysis of boost converter • Boost converter analysis • Design of power stage • Bi-directional converter EEE 498/591 – Raja Ayyanar
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+ Boost (step-up) converter + i L + _ v L V in S 1 D 1 + _ v A i C I o + _ V o D q A A C R L q A 1 0 0 V o v A DT S ( 1-D ) T S ( 1-D ) V o ( ) ( ) since 0 1 Ai n L Ao vV v vD V == =- 1 1 o in V VD = - Input-output relationship for Boost converter EEE 498/591 – Raja Ayyanar
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q A 1 0 V o v A t DT S ( 1-D ) T S 0 Boost converter – waveforms (CCM) + i L + _ v L V in S 1 D 1 + _ v A i C I o + _ V o D q A A C R L ON interval i D A qD = ( ) 1 A o vD V =- v L V in -V o V in 0 1 in V m L = 2 in o VV m L - = i L 0 OFF interval ( ) 1 o Li n I iI D == - Do = i D 0 i C 0 () ( ) ( ) 10 11 1 1 in s in o s in o o in VD T V V DT D V D V +- - = +- = - = - -I o EEE 498/591 – Raja Ayyanar
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Selection of L 0 v L V in -V o V in i L 0 L I D I in Consider the T ON interval () 1 L in o S I LV V D DT D == - 1 oS L VD D T L I - = D • L selected such that inductor current ripple is about 10-20% of max. I in • Design for worst case condition • CCM considerations Peak-peak ripple in inductor current DT S EEE 498/591 – Raja Ayyanar
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i C 0 Selection of C -I o I in -I o • Choose C based on RMS current requirement ( capacitor RMS current can be larger than load current ) • Verify if specification is satisfied with the chosen
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This note was uploaded on 05/25/2011 for the course EE 472 taught by Professor Ayynar during the Spring '11 term at ASU.

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472 Lecture 5 Boost converter - Lecture 5 Steady state...

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