1. EET 423 POWER ELECTRONICS -2
Prof R T Kennedy

2. QUANTIZED POWER/ENERGY TRANSFER
SMPS OPERATION
QUANTIZED POWER/ENERGY TRANSFER
VOLTAGE REGULATION
Prof R T Kennedy

3. PRACTICAL SYSTEMS WAVEFORMS VOLTAGE CURRENT PARASITICS: LOSSES
REDUCED EFFICIENCY
FORMULAE
Prof R T Kennedy

4. BUCK CONVERTER CCM: PARASITIC LOSSES
MOSFET
Iout
Dsw T T
Iout
Dfwd T T
RECTIFIER
Prof R T Kennedy

5. BUCK CONVERTER CCM: PARASITIC LOSSES
INDUCTOR esr
rind
Iout T
CAPACITOR esr
esrc
Dsw T T
Prof R T Kennedy

6. BUCK CONVERTER CCM EFFICIENCY
Vout
Iout
Pout R
Ei n
Ii n
Pi n
Prof R T Kennedy

7. BUCK CONVERTER CCM EFFICIENCY
Prof R T Kennedy

8. BUCK CONVERTER CCM: EFFICIENCY
Prof R T Kennedy

9. BUCK CONVERTER CCM: EFFICIENCY
0.5
0.5
0.5
0.67
0.375
Prof R T Kennedy

10. BUCK CONVERTER CCM : EFFICIENCY
Prof R T Kennedy

11. BUCK CONVERTER CCM : EFFICIENCY
Prof R T Kennedy

12. BUCK CONVERTER CCM : EFFICIENCY
Prof R T Kennedy

13. VOLT-TIME INTEGRAL APPROACH
Vout
Ei n R C
Vds L VL
rind
Vr,ind
Iout
rds,on a k
Ei n R C
Vout L VL
rind
Vr, ind
Iout d s VF
IL,M
DswT
(1-Dsw)T = DfwdT VL
Iout t
IL,m IL
Ein–Vds, on –Vr, ind - Vout
area A
area B = area A
-(Vout+ Vr, ind + VF )
Prof R T Kennedy

14. VOLT-TIME INTEGRAL APPROACH
Ein–Vds, on –Vr, ind - Vout
area A
area B = area A
-(Vout+ Vr, ind + VF )
Prof R T Kennedy

15. VOLT-TIME INTEGRAL APPROACH
Ein–Vds, on –Vr, ind - Vout
area A
area B = area A
-(Vout+ Vr, ind + VF )
Prof R T Kennedy

16. VOLT-TIME INTEGRAL APPROACH
Ein–Vds, on –Vr, ind - Vout
area A
area B = area A
-(Vout+ Vr, ind + VF )
Prof R T Kennedy

17. VOLT-TIME INTEGRAL APPROACH
Ein–Vds, on –Vr, ind - Vout
area A
area B = area A
-(Vout+ Vr, ind + VF )
Prof R T Kennedy

18. BUCK CONVERTER: INDUCTOR RESISTANCE
Ei n C R L
Iout
Vout
rind
Prof R T Kennedy

19. BUCK CONVERTER: INDUCTOR RESISTANCE
Ei n C R L
Iout
Vout
rind
ideal
LOW inductor resistance
increased efficiency
inductor resistance
<< LOAD
Prof R T Kennedy

20. BUCK CONVERTER: INDUCTOR RESISTANCE
Ei n C R L
Iout
Vout
rind
ideal
Prof R T Kennedy

21. BUCK CONVERTER: INDUCTOR RESISTANCE
Iout L
rind
Ei n C R
Vout
Vout
Prof R T Kennedy

22. BUCK CONVERTER: MOSFET RESISTANCE
Iout
rds,on L
Ei n C R
Vout
Prof R T Kennedy

23. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
Prof R T Kennedy

24. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
ideal
Prof R T Kennedy

25. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
ideal
Prof R T Kennedy

26. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
ideal
Prof R T Kennedy

27. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
ideal
Prof R T Kennedy

28. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
Vout
Prof R T Kennedy

29. BUCK CONVERTER: MOSFET RESISTANCE
Ei n C R L
Iout
rds,on
Vout
Vds,on
Vout
Prof R T Kennedy

30. Vgs Iout Ic IL Ids Ifwd Ein Vds VL Vfwd VL Vout Dfwd = 1-Dsw DswT
DswT
DfwdT
Dfwd = 1-Dsw
Vgs
Iout Ic IL
Ids
Ifwd
Ein
Vds
Vfwd VL
Vout R
Iout IC L C
Vout
Ids IL
Ifwd
Vgs
fsw
Vfwd
Ei n VL
Vds
Prof R T Kennedy