Chapter 1

Forward Converter with Voltage-Mode Control

Abstract

By chopping a direct-current voltage source via an isolation transformer, switch-mode forward converters transfer input power to the load with a minimum storage in between. For power levels higher than 100 W, this converter type is preferred in contrast to the Flyback.

The design procedure begins by portioning a converter circuit into two groups: the standing-alone compensator, and the rest, including power train, switch driver, and pulse width modulator. This chapter derives first the transfer functions for all building blocks except the compensation error amplifier, the controller. All transfer functions are grouped and named “the modulator.” Given a desired close-loop stability requirement, ...

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