From XP Power
The three basic topologies used in switching power supplies are buck, also known as forward, boost and buck-boost, also known as Flyback.
All three topologies use the same three elements, transistor, inductor and diode but they are arranged in different manners.
The essential difference between the three topologies is that the buck has an output voltage lower than its input, the boost has an output voltage higher than its input and the flyback can have an output voltage either higher or lower than its input but inversed in polarity.
Other topologies include push pull, half bridge, full bridge, CUK and self oscillating types.
The topologies detailed here are pulse width modulated. These can either be direct, where energy is transferred to the output during the on period of the switching element, or indirect where energy is transferred to the output during the off period of the switching element.
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Topics of Interest
Chapter 1: Fundamental Switching Regulators Buck, Boost, and Inverter Topologies Chapter 2: Push-Pull and Forward Converter Topologies Chapter 3: Half- and Full-Bridge Converter Topologies...
7.5 Conclusions The boost-buck is an ideal topology where the LED load voltage can be higher or lower than the supply voltage. It should also be used when the supply voltage is no more than 20%...
As described in Chapter 3, all power DC/DC converters are treated as a second-order-hold (SOH) element in digital control systems. We will discuss this model in various circuits in this chapter.
Forward, buck, or step-down converters are used to convert a higher DC input voltage to a lower DC output voltage of the same polarity. Forward converters are similar to buck-boost converters, but use...
This section serves to highlight and summarize the gamut of key topology-related design issues that should be kept in mind when actually designing converters (or when appearing for a job interview!).
