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Topics in this section include:

  • Inductor design
  • Transformer design
  • Selecting cores

Also, see Design Area, Magnetics

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How Active EMI Filter ICs Reduce Common-Mode Emissions In Single- And Three-Phase Applications (Part 1): An Overview11/15/23
Inductor Saturation Model Supports Analysis Of Inductor And Transformer Designs11/15/23
Analysis Of Core Hysteresis Loss Underscores Transformer Efficiency Challenges 02/15/23
Using Current Transformer In Core Saturating Mode Enables DC Current Measurements10/14/22
Roshen’s Models Offer An Advanced Approach To Modeling Core Losses09/15/22
Transformer Design Pitfalls (Part 2): Demonstrating Stepup Difficulties08/15/22
Transformer Design Pitfalls: Stepup Is Not As Easy As Stepdown07/15/22
Calculating Minimum Magnetic Core Size For A Transformer05/13/22
A Guide To Automating Layout Of Planar Magnetic Designs04/15/22
Analysis Of Energy Storage Inductor Eases Converter Design03/15/22
A Simple Magnetic Design Procedure Determines Core Size02/15/22
A Simplified Winding Design Procedure For Transformers01/14/22
Stored Energy In A Saturating Inductor Is Not Constant11/15/21
Determining Optimal Wire Size For Toroidal Windings10/15/21
Transformer Winding Design: Bundle Layer Approximation As Rings09/15/21
Zener Diode Selection For Faster Inductor Reset in Solenoid Circuits08/15/21
Find A Transformer’s Turns, Phasing And Coupling Factor With An RLC Bridge08/13/21
Developing A 25-kW SiC-Based Fast DC Charger (Part 4): Design Considerations And Simulation Of The DC-DC Stage07/15/21
The Basics of Conducted Emissions Testing for Switch Mode Power Supply Designs05/29/21
Misconceptions In Power Magnetics05/14/21
Bunched Vs. Cabled: Litz Wire Bundle Twist Geometry Influences Proximity Effects 04/15/21
Determining Design Power Over An Input Voltage Range (Part 3): Maximum Transformer Power 03/15/21
Determining Design Power Over An Input Voltage Range (Part 2): Inductor Design Power02/15/21
Using Volt-Second Integral Instead Of Winding Current To Predict Saturation 01/15/21
A Quick Way To Determine Power Supply Output Resistance11/16/20
Determining Design Power Over An Input Voltage Range (Part 1): Maximum Inductor Power11/16/20
Foil Vs. Wire Windings—How Do They Differ?10/15/20
More About No-Load Operation In Current Transformers—Creating Real World Models08/14/20
Interstitial Wire Interleaving Packs More Conductor Into Magnetic Windings07/15/20
Understanding Core Magnetization In Current Transformers—Avoiding Saturation And Dangerous Output Voltage05/15/20
Optimize Inductor Design To Minimize Output-Filter Size04/15/20
How To Choose Magnetics Materials—Beyond Ferrites And Iron-Powder03/13/20
PFC (Part 2): How Current Harmonics Cause Distortion And The Role of the Delta-Wye Transformer03/13/20
GaN-Based Wireless Power Enables Efficient, Seamless Multi-Device Charging02/14/20
Debunking The Gapped Inductor Myth02/14/20
Deflux Windings Benefit Forward Converters But Not Flybacks01/17/20
Flyback Magnetics: Winding-Current Transition Is Key To Efficiency11/15/19
Magnetics Utilization Vs. Converter Topology: A Little Extra Silicon Goes A Long Way10/17/19
Waveform-Based Design: Key Parameters And Figures Of Merit For Power Circuit And Magnetics Optimization09/16/19
Square Vs. Round Core Legs—Balancing Core And Winding Losses08/15/19
What Is Litz Wire and Its Applications?08/13/19
Designing Low-Power Flyback Inductors Using Tiny Toroids (Part 2): Calculating Losses 07/15/19
Designing Low-Power Flyback Inductors Using Tiny Toroids (Part 1): A Boost Converter Application06/17/19
How To Optimize Turns For Maximum Inductance With Core Saturation04/15/19
How To Thermally Model Magnetic Components03/15/19
How Wire Bundle Configurations Influence Eddy-Current Proximity Effects02/15/19
Designing Energy Storing Inductors Properly01/16/19
Interbundle Penetration Of Wire Bundles Improves Their Packing Factor11/15/18
Wire Spool Holders And Toroid Mounts Ease Prototyping Of Magnetic Parts 10/15/18
Optimizing Transformer Winding Design For Max Efficiency Over Output Current Range09/14/18
Selecting An Inductor Value For A DC-DC Boost Converter07/16/18
The Geometry Of Twisted Wire Bundles07/16/18
Bundle Compression Overcomes Aspect Ratio Constraints On Transformer Design 06/15/18
Magnetic-Electric Analogs Relate Magnetic Fields To Familiar Circuit Quantities05/16/18
The size of LLC converters magnetics: Frequency dependence03/29/18
Modeling Of The Sen Transformer Using An Electromagnetic Transients Program03/21/18
Winding Layering Techniques Determine Interlayer Capacitance03/21/18
Transformer Design (Part 2): Aspect Ratio02/16/18
EMI For Wisdom Seekers (Part 3): Differential Mode Noise Versus Common Mode Noise01/15/18
Transformer Design (Part 1): Maximizing Core Utilization 01/15/18
A New Method Of Winding Design Optimization (Part 3): Magnetic Operating Points For Toroidal Windings11/16/17
A New Method Of Winding Design Optimization (Part 2): Optimal Window Magnetic Operating Points10/16/17
A New Method Of Winding Design Optimization (Part 1): Window Geometry And Eddy-Current Plots09/15/17
Ferrite Core Magnetics (Part 2): Gapped Ferrite Cores08/15/17
Ferrite Core Magnetics (Part 1): Ungapped Ferrite Cores07/14/17
Magnetic Component Theory Is Simpler If You Grasp Reference Frames 06/15/17
Magnetics Optimization (Part 4): Minimization Of Transductor Power Loss05/16/17
Magnetics Optimization (Part 3): Maximum Power Transfer Of Magnetics Circuit Model04/17/17
Magnetizable Concrete Paves The Way For EV Charging And Low-Cost Power Magnetics04/17/17
Eddy-Current Effects In Magnetic Design (Part 6): Winding Bundles 03/17/17
Triad Magnetics’ Guide to Inductors: Basics of Inductors03/02/17
Eddy-Current Effects In Magnetic Design (Part 5): Winding Design Optimization 02/17/17
Eddy-Current Effects In Magnetic Design (Part 4): Dowell's Formula 01/16/17
How To Calculate Winding Packing Factor11/16/16
Generate Hysteresis Curves From Magnetic Core Datasheet Parameters11/15/16
Eddy-Current Effects In Magnetic Design (Part 3): Conductor Cross-Sectional Geometry10/17/16
Eddy-Current Effects In Magnetic Design (Part 2): The Proximity Effect09/15/16
Modeling Magnetic Core Offers Insight into Behavior, Operating Range, Saturation09/09/16
Eddy-Current Effects In Magnetic Design (Part 1): The Skin Effect08/15/16
Four-Terminal Inductor Achieves High-Accuracy Current Measurements For POLs (Part 2): Sources Of Error07/15/16
Sizing Your Power Converter's Magnetics (Part 3): Transformer Power Rating With An Input Voltage Range 06/15/16
Sizing Your Power Converter's Magnetics (Part 2): Inductor Power Rating With An Input Voltage Range 05/16/16
Sizing Your Power Converter's Magnetics (Part 1): Inductor Power Rating With Fixed Input Voltage04/18/16
Coil Formers in Today's Electronic Manufacturing Environment03/14/16
Four-Terminal Inductor Achieves High-Accuracy Current Measurements For POLs (Part 1): Inductor Design02/16/16
Power Transformer Design Simplified—Really!01/15/16
Leakage Inductance (Part 1): Friend Or Foe?10/15/15
Magnetics Optimization (Part 2): Maximum Power Transfer Of The Primary-Referred Circuit09/16/15
Magnetics Optimization (Part 1): Equal Core And Winding Losses Do Not Maximize Power Transfer09/15/15
Area-Product Method Can Simplify Core Selection—But Beware Of The "Constants"08/17/15
Nano-Magnetics For High Efficiency Power Supplies05/15/15
Determining Maximum Usable Switching Frequency For Magnetics In CCM-Operated Converters04/16/15
Practical Power Flow Controller Brings Benefits Of Power Electronics To The Grid03/13/15
The Shape Of Optimal Magnetics: Why Flatter Is Better03/13/15
Partial BCM Mode Of Operation Improves Efficiency For Primary-Side Regulated Flyback LED Driver 02/15/15
Choose The Right Regulator For The Right Job (Part 3)02/15/15
Common-Mode Transformer Aids Noise Reduction In High-Power Supplies01/15/15
3D FEA Software Solves Tough Inductive Noise Problems10/15/14
Latest Generation Of 3D Electromagnetic Finite Element Analysis Software With Breakthrough Simplicity Facilitates Magnetic Component Design09/15/14
Cutting Power Transformer Size In Half While Doubling Transistor Efficiency: It's All In The Topology06/13/14
What Is To Be Optimized In Magnetic Component Design? 05/15/14
Power Supply Failure Survey--Part III04/06/14
How are SiC and GaN Catching up to Planar Magnetics?03/20/14
Single-Bundle Windings Make It Easier To Build Custom Magnetics In-House 03/14/14
Understanding Tradeoffs In Core Geometry Aids Transductor Design02/15/14
Matrix Transformers May Find New Life In the SiC and GaN Era 12/16/13
How To Calculate Toroid Winding Length09/16/13
Inductors for the Uninitiated08/21/13
Troubleshooting Distributed Power Systems (Part 3): Measuring Impedance Using Vector Network Analyzers (One-Port Tests)08/15/13
How Not To Observe Magnetic Saturation07/15/13
How To Choose Magnetic Core Size05/15/13
How To Choose Between Ferrite Or Powdered-Iron Cores: A Case Study02/15/13
Magnetically Isolated Digital Coupling Circuit Solves Gate Drive and Communications Dilemmas03/30/12
Core Geometry Coefficient For Resonant Inductors11/30/11
PaytonTechV1Review: Benefits of Planar Magnetics09/16/11
How To Implement A 5-W Wireless Power System07/27/11
Utilizing Full Saturation and Power Loss To Maximize Power Transfer In Magnetic Components02/28/11
Embed Your Planar Magnetics To Maximize DC-DC Converter Performance (Part 2)10/22/10
Embed Your Planar Magnetics To Maximize DC-DC Converter Performance (Part 1)09/24/10
Software Speeds Transformer Design For AC-DC Power Supplies03/30/10
Modeling of Integrated Magnetics Components03/30/10
Digital Isolators: A Space-Saving Alternative to Gate-Drive Transformers in DC-DC Converters03/30/10
Basic Operation - Rogowski Current Transducers03/10/10
Testing Military Grade Magnetics: Transformers, Inductors and Coils01/26/10
What every designer should know about magnetics in switch-mode power supplies11/26/09
Push-Pull Output Inductor Design Using a LPT E2000Q Core10/28/09
Measuring Transformer Distributed Capacitance10/27/09
Current-Sense Transformer Application Design Guidelines10/26/09
Switch Mode Power Supplies and their Magnetics10/26/09
Definitions And Measurement Techniques For Transformers And Inductors10/26/09
Debunking Transformer Performance Myths10/22/09
Don't Let Jitter Shake Up Your Flyback Converter Designs07/24/09
150 W Power Factor Corrected LLC Power Supply Using HiperPLC (PLC810PG)05/11/09
New LED Applications are Unfamiliar Territory, Tools Help Designers with Inductor Selection05/01/09
Improving the Efficiency of PFC Stages Using Interleaved BCM04/27/09
SEPIC Converters Solve Automotive Power Needs Part 204/01/09
SEPIC Converters Solve Automotive Power Needs Part 103/01/09
What to look for in a medical power supply03/01/09
Isolated LED Driver Using the HV9910B02/20/09
Optimising PFC Boost Converter Design02/01/09
EMI Filtering -- How to Get the Lowest Noise (A Vicor Power Techtorial)12/31/08
An Efficiency Primer for Switch-Mode, DC-DC Converter Power Supplies12/23/08
Minimize Winding Losses in High-Frequency Inductors07/01/08
Trick A BJT-Based Converter Into Starting At Only 250 mV DC06/26/08
Designing a SEPIC Converter04/30/08
75 W Output, High Efficiency, Single Stage Flyback Power Supply With PFC for LED Ballasts04/01/08
An introduction to LLC resonant half-bridge converter02/10/08
Expedite Transformer Calculations for Flybacks01/01/08
How Transformers, Chokes and Inductors Work, and Properties of Magnetics01/01/08
Half-bridge LLC Resonant Converter Design Using FSFR-series Fairchild Power Switch (FPS)10/09/07
Designing Single-Switch, Resonant-Reset, Forward Converters08/07/07
Forward-Converter Design Leverages Clever Magnetics Part 208/01/07
Forward-Converter Design Leverages Clever Magnetics Part 107/01/07
Low-cost current monitor tracks high dc currents03/01/07
Wide range 400W L6599-based HB LLC resonant converter for PDP application02/28/07
A Guide to Designing Gate-Drive Transformers01/01/07
Ideas on DC-DC Converters for Delivery of Low Voltage and High Currents for the SLHC/ILC Detector Electronics in Magnetic field and Radiation environments09/25/06
Buck-Converter Design Demystified06/01/06
Switching Regulator Inductor Design04/01/06
Optimizing Single-Stage Power Factor Correction03/01/06
Coupled Inductors Improve Multiphase Buck Efficiency01/01/06
24 W Primary-side Regulated Flyback Power Supply using TOP245Y12/07/05
Designing Single-Switch Forward Converters10/01/05
Scaling Design Methods To Improve Transformers10/01/05
Squeeze More Performance Out of Toroidal Inductors10/01/05
EMI Considerations in Selecting AC/DC Switching Power Supplies 09/01/05
Minimizing Switching Regulator Residue in Linear Regulator Outputs07/01/05
Estimate Inductor Losses Easily in Power Supply Designs04/01/05
Inductor Current-Sensing Boosts Regulator Efficiency04/01/05
Modeling Integrated Magnetic Components03/01/05
Exploiting Integrated Planar Magnetics01/01/05
Circuit Analysis Accounts For Magnetic Fields11/01/04
Power Transformer Attenuates Harmonics10/01/04
Analysis of Closed-Loop DC-DC Converters10/01/04
Estimating Temperature Rise of Transformers07/01/04
Active Clamp Transformer Reset: High or Low Side?07/01/04
Navigating the IEEE 802.3af Standard for PoE06/01/04
Designing Switchmode Transformers for Optimum Efficiency06/01/04
Inductor Current Rating for a Buck-Boost Converter05/01/04
Magnetic Solutions: Solving Inrush at the Source04/01/04
Tapped-Inductor Boost Converter Yields Dime-Size Supply04/01/04
Current-Doubler Rectifier Reduces Ripple Current03/01/04
Half-bridge Circuit Behavior02/27/04
Thermal Management of Planar Magnetics02/01/04
Active Clamp Resets Transformer in Converters01/01/04
Inductor Core Material: The Heart of an Inductor01/01/04
ZVS Resonant Converter For Consumer Application Using L6598 IC09/01/03
Building a Power Supply That Works02/20/03
Designing DC/DC converters based on SEPIC topology01/02/03
Design Guidelines for Off-line Forward Converters Using Fairchild Power Switch (FPS)01/01/03
Planar Power Magnetics; Cost Effective, Low-Profile Transformer and Inductor Designs, Part 209/01/02
Proper Layout and Component Selection Controls EMI08/21/02
Characterizing Space-Flight Inductors and Transformer Failures08/01/02
Planar Power Magnetics; New Low-Profile Approaches for Low-Cost Magnetics Designs (Part I)07/01/02
SEPIC Equations and Component Ratings04/23/02
Magnetics Design for Switching Power Supplies, Section 101/01/01
The Benefits of Planar Magnetics in HF Power Conversion01/01/01
A New Procedure for High-Frequency Electronic Ballast Design10/12/98
A Monolithic Switching Regulator with 100mV Output Noise10/01/97
EMI and Power Supplies in Medical Electronics02/01/97
Planar Magnetic Component Development09/01/94

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