Design Center
[A05] The Digital Power Supply Revolution
The effects of digital control on loop design.
[A04] The Reemergence of Quality
Kevin Parmenter talks about the trade-off between cost saving and quality.
[A03] Modeling Ferrite Core Losses
The Ridley-Nace model improves accuracy over wide range of core usage.
[A02] The Electric Car: What Does the Future Hold?
The Tzero car from ac propulsion set the stage for Tesla and other electric car companies.
[A01] Frequency Response Measurement
Frequency response measurements for a wide range of applications.
[095] Current-Model History and Loose Ends Part IV – Infinite Gain Model
Papers from MIT and others indicate a current loop gain of infinity under all conditions, clearly an impossibility according to Nyquist.
[094] Current-Mode History and Loose Ends Part III – Lee’s Model
Dr. Lee's early papers indicated a current loop crossover approaching infinity at D=0.5, violating Nyquist priciples by a large margin.
[093] Current-Mode History and Loose Ends Part II – Middlebrook’s Model
Dr. Middlebrook's early paper on current mode indicated a current loop crossover above half the switching frequency, violating Nyquist priciples.
[092] Current-Mode History and Loose Ends Part I
Confusion and errors in calculating the current modulator loop gain are resolved in this series.
[091] Core Loss Modeling - Part III Sinewave Versus Triangle Wave Losses
Calculating the difference between sinewave and triangle wave excitation shows that sinewave measurements are sufficient for loss calculations.
[090] Core Loss Modeling - Part II Incorporating Duty Cycle Effects
Improved formulas for magnetics core loss with duty cycle effects.
[089] Core Loss Modeling - Part I Ridley-Nace Equation
Improved formulas for calculating magnetics core loss.
[088] PSRR and Low-Performance Control Loops
PSRR becomes a major problem with poorly-designed control loops.
[087] Real World Magnetics Design Issues
Many things can go wrong in the design and production of power supply magnetics.
[086] Optimizing Foil Windings for Power Supply Magnetics
Choosing the right foil thickness affects total winding dissipation.
[085] Low-Profile Inductors with Helical Foil Windings
Inductors made with helical foil windings.
[084] Practical Control Measurements for the Cuk Converter
Practical control measurements for the Cuk converter.
[083] Noninvasive Loop Gains from Output Impedance Measurements
Nonivasive loop gain approximation from output impedance measurements.
[082] Sepic Converter Measurements - Part III Current-Mode Design
Measuring the Sepic converter control transfer function with current-mode control.
[081] Sepic Converter Measurements - Part II Coupled Inductor Design
Control measurements for the Sepic converter with coupled inductors.
