TABLE OF CONTENTS 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.
Power DC/DC converters have plenty of topologies, and the corresponding conversion technique is a big research topic. By an uncompleted statistics, there are more than 500 topologies of power DC/DC converters existing. Dr. F. L. Luo and Dr. H.Ye have firstly categorized all existing prototypes of the power DC/DC converters into six generations theoretically and evolutionarily since 2001. Their work is an outstanding contribution in the development of DC/DC conversion technology, and has been recognized and assessed by experts worldwide.
First-generation (classical/traditional) converters
Second-generation (multi-quadrant) converters
Third-generation (switched-component, SI/SC) converters
Fourth-generation (soft-switching: ZCS/ZVS/ZT) converters
Fifth-generation (synchronous rectifier, SR) converters
Sixth-generation (multiple energy-storage elements resonant, MER) converters
The first-generation converters perform in a single-quadrant mode and in low-power range (up to around 100 W). Since its development lasts a long time, it has briefly five categories:
Fundamental converters
Transformer-type converters
Developed converters
Voltage-lift converters
Super-lift converters
Three types of fundamental DC/DC topologies were constructed, which are Buck converter, Boost converter and Buck Boost converter. They can be derived from single-quadrant operation choppers. For example, buck converter was derived from A-type chopper. These converters have two main problems: linkage between input and output, and very...
