Interesting history of electronic technology: the early history of switching power supplies

Usually switching power supplies are considered to be part of analog circuits. Although linear regulated power supplies are analog circuits, switching power supplies themselves are not analog circuits. Why? Please see detailed explanation.

• Chapter 1：The early history of switching power supply (1): Is switching power supply an analog circuit? (27 minutes and 27 seconds)

• Chapter 2：The early history of switching power supplies (2): starting from the mechanical contact switching power supply in the tube era (15 minutes and 6 seconds)

• Chapter 3：The early history of switching power supplies (3): How do switching power supplies without inductors get around? (22 minutes and 12 seconds)

• Chapter 4：The early history of switching power supplies (4): Current applications of open source power supplies without inductors (27 minutes and 0 seconds)

• Chapter 5：The early history of switching power supplies (5): How to use the knowledge and methods of predecessors to solve problems? (34 minutes and 25 seconds)