prob2_9 and

prob2_9 and - 1 LECTURE 7 ILLUSTRATIVE PROBLEMS AND...

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1 LECTURE 7 ILLUSTRATIVE PROBLEMS AND HOMEWORK HINTS FOR OUTPUT FILTER AC WAVEFORMS I. ERICKSON PROBLEM 2.9 A. V L1 , i c1 , input filter vs. time V L2 , i C2 output filter vs.time B. I (transistor) vs. TIME I (diode) vs. TIME C. L 1 , L 2 - volt-sec balance gives steady state voltages C 1 ,C 2 - charge balance gives steady state voltages D. RIPPLE ON INPUT FILTER a. C 1 FOR V C1 SPEC b. L 1 FOR I L1 SPEC II. HOMEWORK PROBLEM HINTS,ANSWER QUESTIONS AND CATCH-UP TOPICS LECTURE
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2 OUTPUT AND INPUT AC WAVEFORMS CAUSED BY SWITCHING I. ERICKSON Problem 2.9 V g i 1 L 1 C 1 - - + + v C1 i T Q1 L 2 i 2 C 2 R v D1 Input L-C filter Buck Output L-C filter Fig. 2.32 Q1 and D1 form a two position switch for the double pole double throw switch of the Buck topology. For DT s (SW on) D1 is off Q1 is on Switch in position 1 circuit topology For D ’T s (SW off) D1 is on Q1 is off Switch in position 2 circuit topology V g i 1 L 1 C 1 - + L 2 C 2 R v o i 2 i c1 V g i 1 L 1 C 1 i c1 - + L 2 C 2 R v o i 2
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3 V L1 DT s D'T s t No V L for steady-state I C1 DT s D'T s t I 1 =i C I 1 -I 2 =i C V L2 DT s D'T s t V C1 -V out -V I C2 DT s D'T s t All I 2 flows in R I 2 -V/R=0 i T WAVEFORM: V ON (Transistor) 0 I
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prob2_9 and - 1 LECTURE 7 ILLUSTRATIVE PROBLEMS AND...

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