Abstract

In the previous article we discussed how to design a compensator under voltage mode control. In this article we are going to look at how to compensate a peak current mode controlled Forward type converter. Peak current mode control has some advantages over voltage mode control including inherent current limiting, better line regulation and easier current sharing across multiple power stages [1].

For now we will look at hard switched non-isolated converters only and the design method presented here can be applied to all Forward type converters under peak current mode control without an opto-coupler. We will discuss isolation and other topologies in later articles.

Introduction

Peak current mode operation

Before we begin our compensator design, let us first look at how peak current mode control (PCMC) works.

The operation of the converter, at first glance, is quite simple. The circuit for a PCMC Buck converter is shown in Figure 1.

Please register to download the complete version of this resource