Buck Boost Converter - Part 3

The buck-boost converter is a type of DC-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is a DC-to-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. Typically the output produced is at a different voltage level than the input. It is a switch mode power supply with a similar circuit topology to the boost converter and the buck converter. The output voltage is adjustable based on the duty cycle of the switching transistor. Also, the polarity of the output voltage is opposite the input voltage. It has the same structure as the, flyback converter with an inductor instead of a transformer. One drawback of this converter is that the switch does not have a terminal at ground; this complicates the driving circuitry. It is used in USB applications and UPS for computers.