Design and Optimization 2nd  Ed.

Author Sanjaya Maniktala manages to focus on the key aspects of Design & Optimization which are the very essence of any switching power supply design. His books tend to be a complete coverage of their topics and stand alone as a reference for a designer—this one is no exception. This exhaustive-coverage “designer manual” starts with Regulators, moves on to various DC-DC Converter topologies, both Fundamental and Composite and on to AC-DC Power Conversion. It does not stop there.


Delving deeply into the passive components such as Magnetics including Transformer Design is a topic covered very completely. Other key areas that designers will have to deal with are PC boards and layout, EMI and Thermal Management.


The book finishes with Efficiency, Reliability, Testing and Safety Issues and then a bonus: The world’s first simplified LLC design methodology (Chapter 19). This coming from the engineer himself who developed a unique design methodology for this topology—Sanjaya Maniktala. He applies power and frequency scaling principles that have been traditionally used in conventional power conversion to resonant power conversion. This greatly simplifies the treatment of this vital subject.


A “Golden nugget” in this book is the in-depth treatment of the LLC converter topology. The excellent efficiency of this switching regulator topology is a “green” technology being widely accepted. As an analog designer, I really like the low EMI in this topology. I always tried to keep a great barrier between my sensitive analog circuitry and noisy switching supplies, so it’s really good to see a topology that minimizes EMI.


I was particularly intrigued by the way the author developed Chapter 19 on Soft-Switching and Designing LLC Converters. He begins with an understanding of the transition from conventional PWM power conversion to a resonant topology. The author states:

At an early moment during the development of conventional square-wave switching power conversion, it was said that nature abhors any attempt to suddenly turn OFF the current passing through an inductor. That fear prompted attempts at creating resonant topologies.


So Maniktala begins with a phenomenon with which we are all familiar from our EE101 courses, current in an inductor cannot change instantaneously. He progresses beyond the trial-and-error methods that many designers had pursued in the past and moves through the building blocks for each stage in the design while deeply analyzing the performance at each step validated with Mathcad and Simplis after the reader understands the simplified math. The author ensures that the reader understands each successive step in the analysis and design before proceeding to the next step.


Maniktala discusses many lessons learned from his insightful and vast knowledge of this topology so that the designer will not have to make any unnecessary mistakes and this leads to faster time to market for a project.

Building circuits is then outlined with the proper components. The reader has now transitioned from “PWM thinking” to a comfort level in resonant technology. Now we progress into the second part of Chapter 19 with Series Resonant Tank Circuits and moving into the LLC Tank circuitry in great detail. The LLC Tank is at the heart of lower switching losses. 27 pages later we are an expert in LLC Converter design.


This second edition of Maniktala’s book is virtually a new book as compared to his first work in 2005. So much has changed in the last ten years but even his First Edition of this book is still a keeper on the shelves of designers. The concepts covered in that book have not changed and are still relevant. This Second Edition stands alone in giving the designer the benefits of all the power management advances in the last decade along with a well-structured guide map to a full, extensive design methodology that allows a designer to reach their goal of a robust Switching Power Supply design that will meet any system design parameters needed to be a successful power solution. This Second Edition can sit right next to the First Edition in a designer’s bookshelf as useful design references and even as a textbook pair at the University level.


Writing with a labor of love , Maniktala’s enthusiasm for a potentially dry subject colors his treatment of every aspect of switching power design and turns a text book type format into a really witty and vivid account of the detailed design process. At times he is brutally honest and offers strong opinions and commentary of anything he considers patronizing, misguided or dishonest. I like that!


Maniktala endeavors to teach, not to preach, in his works. He goes deeply into the true meaning of Guru; the need to pass on knowledge to others attained by experience with a dose of humility regarding how much we still do not know. This attitude bodes well for future books by Maniktala as he continues to learn and innovate in his engineering journey

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Power over Ethernet Interoperability Guide

....An insightful technical treatment of Power over Ethernet along with a more extensive history taking us back 200 years is artfully covered in Chapter 1 of Sanjaya Maniktala’s book entitled Power over Ethernet Interoperability.


Maniktala’s treatment of the union of Power and Networking is masterful as he develops the PoE technology with an emphasis on Interoperability, a critical dimension to any useful standard. The author helps to add needed clarity to the IEEE 802.3at standard and other previous versions as well with this book.


The exhaustive chapter insights move with a natural progression from PoE operation into Detection schemes, Classification methods, and Inrush and Power-up modes. Next, once the Power-on state is reached, further Operations addressing concerns about avoiding disconnect and protecting from faults are begun.......continued