Updated version of Dr. Ridley's definitive Current-Mode Control Book

Dr. Vorperian's hand-written analysis of the tightly-coupled sepic converter.

Dr. Vorperian's analysis of the tightly-coupled sepic converter.

The complete analysis of the Sepic converter – the only place where this can be found. By Dr. Vorpérian.

How to analyze the low-frequency plant characteristics of a PFC circuit.

Vorpérian’s amazing ripple theorem generates ripple currents and voltages from the small-signal switch model.

The correct modulator gain is confirmed by experiment. Different analysis results are completely resolved when choosing the right modulator gain.

Summarizing the main features of the Sepic control characteristics.

Papers from MIT and others indicate a current loop gain of infinity under all conditions, clearly an impossibility according to Nyquist.

Dr. Lee's early papers indicated a current loop crossover approaching infinity at D=0.5, violating Nyquist priciples by a large margin.

Dr. Middlebrook's early paper on current mode indicated a current loop crossover above half the switching frequency, violating Nyquist priciples.

Confusion and errors in calculating the current modulator loop gain are resolved in this series.

Using the switch model to analyze the tapped boost converter.

A review of Vorperian's PWM switch model which completely changed the task of converter modeling.