Accurate Estimation of Losses of Power Inductor in Power Electronics Applications By: Jochen Baier Würth Elektronik eiSos, Waldenburg, Germany APEC 2016, Long Beach, CA 1 Accurate Estimation of Losses of Power Inductor in Power Electronics Applications - Ranjith Bramanpalli, Würth Elektronik eiSos, Waldenburg, Germany
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Accurate Estimation of Losses of Power Inductor in
Power Electronics ApplicationsBy:
Jochen Baier
Würth Elektronik eiSos,
Waldenburg, Germany
APEC 2016, Long Beach, CA
1
Accurate Estimation of Losses of Power Inductor in Power Electronics Applications - Ranjith Bramanpalli, Würth Elektronik eiSos, Waldenburg, Germany
Table of Contents
Introduction
Estimation of losses(Classical approach)
Disadvantages
Würth Elektronik AC Loss Model
Setup & Empirical Data
Comparison of results
Advantages & Disadvantages
Future work & Conclusion
Questions?
2Accurate Estimation of Losses of Power Inductor in Power Electronics Applications - Ranjith Bramanpalli, Würth Elektronik eiSos, Waldenburg, Germany
Introduction
Applications of Power Inductor in Power Electronics & the necessity to estimate losses accurately
3
Vin
+
- RloadVIN COUTD1
Q1L1 Storage Inductor
CAC
CIN
D1
COUT
VIN
VOUT
L1
Q1
Coupled InductorFig:1 Buck Converter
Fig 2: SEPIC Converter
+
-
D1
DR1
DR4 DR3
DR2
RL
L1
LP
Q2Q1
Q4 Q3
LS CS
VIN CIN
Filter Inductor
Fig 3: LLC Full Bridge Converter
Accurate Estimation of Losses of Power Inductor in Power Electronics Applications - Ranjith Bramanpalli, Würth Elektronik eiSos, Waldenburg, Germany
Losses
Loss in Magnetic components
Ohmic copper Loss
Winding loss due to AC & DC current
Core Loss – Hysteresis & Eddy current loss
Hysteresis loss ∝ 𝑓 · (𝐵𝑚)𝛼
Eddy Current loss ∝ 𝑓2 · (𝐵𝑚)2
4
Fig 4: Typical B-H Curve of a magnetic material with Sine-wave excitation
B
H
ΔB
Accurate Estimation of Losses of Power Inductor in Power Electronics Applications - Ranjith Bramanpalli, Würth Elektronik eiSos, Waldenburg, Germany
Estimation of Losses
Copper Ohmic loss: 𝑰𝒓𝒎𝒔𝟐 · 𝑹𝑫𝑪
Winding Loss due to AC current – Skin effect, Proximity effect
Finite Element Analysis
Hysteresis & Eddy Current Loss due to AC flux in the core