1. Buck-Boost Converters
Dy, Charlton Paul
Ortega, Rommel Joshua

2. Buck-Boost Converter Step up/down power converter
Output voltage can be either higher or lower than the input voltage
Non-isolated (input and output share common ground) inverting or non-inverting power stage topology

3. Buck-Boost Converter
Non-inverting Topology

4. Operation as a Buck Converter

5. Operation as a Boost Converter

6. Modes of Operation Continuous Conduction Mode
Discontinuous Conduction Mode

7. Continuous Conduction Mode
Current through the inductor never falls to zero during a cycle

8. Continuous Conduction Mode
As a Buck Converter

9. Continuous Conduction Mode
As a Boost Converter

10. Discontinuous Conduction Mode
Amount of energy required by the load is small enough to be transferred in a time shorter than the cycle
Current at the inductor falls to zero for some time near the end of the cycle

11. Discontinuous Conduction Mode
As a Buck Converter

12. Discontinuous Conduction Mode
As a Boost Converter

13. Applications Battery-powered systems Input voltage may vary widely
Decreasing battery charge

14. Sources http://www.learnabout- electronics.org/PSU/psu33.php
pdf
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