History
1926: "Electrical condensors" by Coursey mentions high frequency welding and furnaces.
1959: Transistor oscillation and rectifying converter power supply system U.S. Patent 3,040,271 is filed.
1970: High-Efficiency Power Supply produced from about 1970 to 1995.
1972: HP-35, Hewlett-Packard's first pocket calculator, is introduced with transistor switching power supply for light-emitting diodes, clocks, timing, ROM, and registers.
1976: "Switched mode power supply" U.S. Patent 4,097,773 is filed.
1977: Apple II is designed with a switching mode power supply. "For its time (1977) it was a breakthrough, since until then switching mode power supplies weren’t used. Designed by Rod Holt,". "Rod Holt was brought in as product engineer and there were several flaws in Apple II that were never publicized. One thing Holt has to his credit is that he created the switching power supply that allowed us to do a very lightweight computer".
1980: The HP8662A 10 kHz – 1.28 GHz synthesized signal generator went with a switched power supply.
Read more about this topic: Switched-mode Power Supply
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