Power PSoC 110: Power Converter Efficiency Analysis

1. Power PSoC 110: Power Converter Efficiency Analysis

2. Section 1:Introduction Section 2:Circuit Parasitics and Loss Mechanisms Section 3:Steady State Solutions Section 4:Improving Efficiency in Converters Course Outline

3. Understand power loss mechanism in power converters Understand how to minimize the effects of such mechanisms Understand how power converter transfer functions vary when non-idealities in circuit parameters are introduced Explain the methods to improve efficiency in power converters Course Objectives At the end of this course, you should be able to:

4. 1 Introduction

5. Efficiency - Fundamental Characteristic of a Power Converter Power loss – Intrinsic Nature Non-idealities prevent us from attaining 100% efficient power conversion Maximize efficiency Introduction

6. 2 Circuit Parasitics and Loss Mechanisms Power Converter Circuit Elements

7. Power Losses in Converters VOUT = D x VIN IIN = D x IOU T PCONDmosfet = IMOSFETon(avg)2 x RDSon x D PCONDdiode = IDIODEon(avg) x VD x (1-D)

8. Power Losses in Converters PSWmosfet = 0.5 x VD x ID x (tSWon + tSWoff) x fs PSWdiode = 0.5 x VREVERSE x IRRpeak x tRR2 x fs

9. Power Losses in Converters PCONDinductor = IOUT(avg)2 x RDCR PCONDcapacitor = IC(avg)2 x RESR

10. 3 Steady State Solutions Operating Principle

11. Steady State Equations MOSFET OFF MOSFET ON

12. Steady State Equations vL(t) = VIN – iL(t)RDCR – iMOSFET(t)RON –vout(t) Using small ripple approximation, vL(t) = VIN– IOUTRDCR – IOUTRON – VOUT

13. Steady State Equations vL(t) = – iL(t)RDCR – iD(t)RD – vout(t) -VD Using small ripple approximation, vL(t) = -VOUT– IOUTRDCR – IOUTRD – VD

14. Steady State Equations Using inductor volt-sec balance, average inductor voltage<vL(t)>=0 <vL(t)>= <vL(t)> when MOSFET is on + <vL(t)> when MOSFET is off <vL(t)> = D vL(t) –D' vL(t) =0 D = TON/TS; D’=1-D=1-(TON/TS)=TOFF/TS TON:time when MOSFET is on TOFF:time when MOSFET is off TS=TON+TOFF VOUT = DVIN – (D'VD + D' IOUTRD + IOUTRL + DIOUTRON )

15. 4 Improving Efficiency in Converters

16. Improving Efficiency

17. Discussed the concept of efficiency and power loss in power converters Understood how to minimize the effects of such mechanisms Showed how circuit transfer function is affected due to power loss causing factors Explained how to over come the non-idealities of circuit components and improve efficiency in converters Course Summary

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