Using A Four-Switch Buck-Boost Bidirectional DC-DC Converter For Battery Backup Applications
by Bosheng Sun, Texas Instruments, Dallas, Texas, How2Power Today, Apr 15 2019
Focus:
This article discusses a dc battery backup system employing a bidirectional dc-dc converter
based on the four-switch buck-boost topology. This article begins by reviewing the requirements
for a battery-based backup power supply system and explains why the four-switch buck boost
converter is well suited to this application. After a quick summary of how the converter’s
switches operate under a basic control scheme, a more elaborate six-mode control scheme to
achieve high efficiency is described. New challenges caused by the six-mode control scheme such
as how to drive the high-side MOSFET with 100% duty, how to transition smoothly between modes
and how to optimize loop compensation are also discussed. This is followed by a brief
discussion of how this control scheme can be implemented using the UCD3138 digital controller.
What you’ll learn:
- How to implement a four-switch bidirectional buck-boost converter for battery backup applications
- How to control a four-switch buck-boost converter bidirectionally using a digital controller
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