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Power Converters with Digital Filter Feedback Control by Keng C. Wu

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Chapter 4

Flyback Converter with Current-Mode Control

Abstract

Following a similar spirit as Chapter 2, peak current-mode control is elected to replace the voltage-mode implementation given in Chapter 3. Once again, the key step in this chapter lies in the derivation of the current-mode PWM gain. Once it is developed, all other procedures almost follow the same sequence as those of Chapter 2.

Keywords

current-mode
current loop
transfer function
gain margin
phase margin
loop gain
bilinear transform
digital filter

4.1. Current-mode schematic

To obtain peak current-mode control, the voltage-mode PWM in Figure 3.3 is replaced by a resistive current sensor Rs, a noninverting scaling amplifier (gain Ac), a comparator, and an RSFF (Figure 4.1).
Figure ...

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