Origin of Switching Power Supply Interest Group
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The switching power supply interest group has started activities.
This group adopts the method that each member reads the designated books and considers several thinking questions within a certain period of time. If there is a problem, post a question on the power supply board and the netizens will help solve it.
The switching power supply has always been regarded as a difficult subject. There are probably several reasons why it is considered difficult. First, the power part of the switching power supply works in the switching state, that is, the large signal state. The small signal analysis learned in the analog circuit course is not used here, but the control circuit of the switching power supply is all small signal circuits. The stability analysis of the switching power supply also relies on small signal analysis. The switching power supply control chip also has latches and other circuits that are generally only discussed in digital circuit courses. Second, the switching power supply theory is all ideal components, but ideal components cannot be found in actual circuits. The degree of deviation of each component from the ideal must be carefully considered, and the distributed parameters of each component must be analyzed. Third, the knowledge required for switching power supplies is scattered in multiple courses and multiple books, from the definition of resistance, capacitance and inductance in the circuit analysis course, Kirchhoff's law, to the operation of devices (bipolar transistors, field effect transistors, etc.), to ferromagnetic materials, to nonlinear devices, to nonlinear feedback, and so on. Readers must refer to multiple books (although only a small part of the content in each book may be needed) to fully understand the operation of the switching power supply.
Therefore, no switching power supply textbook can meet all needs, and readers must refer to multiple books. Even if you read multiple books, because the performance of components in switching power supplies is developing rapidly, circuits that could not be made in the past can now be made, and the knowledge of switching power supply designers must be updated from time to time to keep up with the development of the times.
There are also many books on switching power supplies, and the explanations of each book are different. Some books start with ideal components to explain the working principle of switching power supplies, some books start with actual components, and some books start with actual circuits. Even the same circuit has different names in different books, and even the symbol of the transistor may be different in different books...
In view of this, our switching power supply interest group intends to adopt a reading method of focusing on one book and referring to other books at any time. Whenever other books need to be referred to, we will indicate which book to refer to in advance.
We intend to mainly read "Switching Power Supply Design (3rd Edition)" by Abraham I Pressman, but not all chapters must be read. The contents of some chapters are not used in electronic technology, and the contents of some chapters are outdated today, so it doesn't matter if you don't read them.
We don't plan to read the following chapters:
Chapter 5 Current Mode and Current Feed Topology
Chapter 6 Other Topologies
Chapter 8 Base Drive Circuit of Bipolar High Power Transistor
Chapter 10 Magnetic Amplifier Post-Regulator
Chapter 13 Resonant Converter
Chapter 16 Electronic Ballast-High Frequency Power Supply for Fluorescent Lamps
Chapter 17 Low Input Voltage Converter for Laptops and Portable Electronic Devices
The above seven chapters will be removed and not read.
We will list other reference books besides this book one after another.
The third edition of this book was revised by two other people, Keith Billings and Taylor Morey, after the author's death, and some errors in the second edition were corrected. Various textbooks always have various errors, and even after several corrections, there are still errors. This is not surprising, nor is it a reason to deny this book. As long as we see these errors, our level will be improved.
This "Switching Power Supply Design (3rd Edition)" is initially planned to be read in 34 to 38 activities. The reason for not determining the number of times is that whether Chapter 15 "Power Factor and Power Factor Correction" needs to be studied depends on the opinions of the group members. Usually, power factor correction is not required for small-power switching power supplies.
After these reading activities, can the group members become masters of switching power supplies? Let me pour some cold water on you first: It's still early, and don't have too high expectations. After reading these chapters, you only have a preliminary understanding of the working of the switching power supply, and you can carry out some relatively simple experimental designs of switching power supplies. As for many details of the working of the switching power supply, further study is needed. For example, output short-circuit protection is now a basic requirement for switching power supplies, but it is not mentioned in these books. To design a switching power supply that will not be damaged even if the output is suddenly short-circuited, further study is needed.
As the leader of the switching power supply interest group, I am not a graduate of switching power supply, but I participated in switching power supply earlier. I can only guide you to read and answer some questions, but I cannot answer all the questions. For the questions I cannot answer, please ask the eeworld power supply experts to answer them. I just want to introduce some experiences, especially the experience of failure and the experience of smoking and exploding, to everyone. In addition, I want to trigger a wide discussion on switching power supplies through group learning.
I hope the activities of the switching power supply interest group can arouse your interest!
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