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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 A in L A o v V v v D V = = = - 1 1 o in V V D = - 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 q D = ( ) 1 A o v D V = - v L V in -V o V in 0 1 in V m L = 2 in o V V m L - = i L 0 ( ) 1 o L in I i I D = = - D o i I = i D 0 i C 0 ( )( ) ( ) ( ) 1 0 1 1 1 1 in s in o s in o o in V DT V V D T V D D V D V V D + - - = + - = - = - -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 L V V D DT D = = - ( ) 1 o S L V D 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 C and ESR values
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