Switchmode Power Supply Handbook 3rd Edition.
When Keith Billings wrote the first edition of Switchmode Power Supply Handbook over twenty years ago, he was aware that many engineers had expressed the desire for a general handbook on the subject. He responded to this need with a practical, easy-to-read explanation of many of the techniques in common use, together with some of the latest developments. The author has drawn upon his own experience of the questions most often asked by students and junior engineers to address the subject in the most straightforward way, giving explicit design examples which do not assume any previous knowledge of the subject. In particular, the design of the wound components is covered very fully, since these are critical to the final performance but tend to be rather poorly understood.
In the third edition Keith continues the easily assimilated, nonacademic treatment, using the simplified theory and mathematical analysis that was so well received in the previous editions, waiving the fully rigorous approach in the interests of simplicity. As a result, this latest edition should once again appeal to students, junior engineers, and interested non specialist users, as well as practicing professional power supply engineers.
The new edition covers the subject from simple system explanations (with typical specifications and performance parameters) to the final component, thermal, and circuit design and evaluation, and now includes new material related to resonant and quasi-resonant systems and highly efficient, high power, phase shift-modulated switching converters.
As before, to simplify the design approach, considerable use has been made of pomograms, many of which have been developed by the author, originally for his own use. Some of the more academic supporting theory is covered in the chapter appendixes, and those who wish to go further should read these and the many excellent specialized books and papers mentioned in the references.
Since the seventies, switch mode power supply design has developed from a somewhat neglected “black art” to a precise engineering science. The rapid advances in electronic component miniaturization and space exploration have led to an ever-increasing need for small, efficient, power processing equipment. In recent years this need has caught and focused the attention of some of the world’s most competent electronic engineers. As a result of intensive research and development, there have been many new innovations with a bewildering array of topologies.
As yet, there is no single “ideal” system that meets all needs. Each topology lays claim to various advantages and limitations, and the power supply designer’s skill and experience is still needed to match the specification requirements to the most suitable topology to define the preferred technique for a particular application. The modern switch mode power supply will often be a small part of a more complex processing system. Hence, as well as supplying the necessary voltages and currents for the user’s equipment, it will often provide many other ancillary functions—for example, power good signals (showing when all outputs are within their specified limits), power failure warning signals (giving advanced warning of line failure), and overtemperature protection, which will shut the system down before damage can occur. Further, it may respond to an external signal demand for power on or power off. Power limit and current limit circuitry will protect the supply and load from fault conditions. Overvoltage protection is often provided to protect sensitive loads from overvoltage conditions, and in some special applications, synchronization of the switching frequency to an external clock will be provided. Hence, the power supply designer must understand and meet many needs.
To utilize or specify a modern power processing system more effectively, the user should be familiar with the advantages and limitations of the many techniques available. With this information, the system engineer can specify the power supply requirements so that the most cost-effective and reliable system may be designed to meet these needs. Very often a small change in specification or rearrangement of the power distribution system will allow the power supply designer to produce a much more reliable and cost-effective solution to the user’s needs. Hence, to produce the most reliable and cost-effective design, the development of the specification should be an interactive exercise between the power supply designer and the user.
Very often, power supply specifications have inflexible and often artificial boundaries and limitations. These unrealistic specifications usually result in over specified requirements and hence an overdesigned supply. This in turn can entail high cost, high complexity, and lower reliability. The power supply user who takes the trouble to understand the limitations and advantages of modern switchmode techniques will be in a far better position to specify and obtain reliable and cost-effective solutions to power supply requirements.
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