Chapter 2

Forward Converter with Current-Mode Control


In contrast to Chapter 1, in which a single-loop, voltage-mode control is employed, this chapter uses current-mode control with an inner, current feedback loop, and it results in a two-loop system. The current feedback may be implemented in two approaches: a magnetic current sensor or a low-value resistive element in series with the primary power switch.

Current-mode pulse-width-modulation (PWM) gains significantly different from voltage-mode PWM is derived. It results in two loops. Once the inner current loop is absorbed, the procedure to identify the error amplifier is similar to the one presented in Chapter 1.


current loop
current sensor
transfer function

Get Power Converters with Digital Filter Feedback Control now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.