Flyback converter with improved dynamic load response

Abstract

The invention provides a secondary side control loop for a flyback converter. The secondary side control loop uses a compensator to generate a secondary side control signal during normal operation. Open-loop signals are used as secondary-side control signals by bypassing the compensator during periods of significant load changes.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 867,663, filed June 27, 2019, and entitled "Flyback Converter With Improved Dynamic Load Response," the contents of which are incorporated herein by reference. technical field [0003] The present application relates to flyback converters, and more particularly to flyback converters with improved dynamic load response. Background technique [0004] Isolated switching power converters such as flyback converters are commonly used in AC-DC and DC-DC conversion where there is electrical isolation between the input supply and one or more output terminals. A flyback converter is a buck-boost converter in which the inductor is split to form a transformer that both scales the output voltage and provides primary-to-secondary isolation. A controller in a flyback converter controls the cycling of the power switching transistors to regulate the outp...

AI Technical Summary

Problems solved by technology

However, filtering at the output of the optocoupler reduces the feedback loop bandwidth and delays the received control signal response

This delay slows down the dynamic load response, which causes the output voltage to have unusual overshoots and undershoots to transient load changes

Images