User:Electron9/SMPS History

History
1926 "Electrical condensors" by Coursey. Mentions high frequency welding and furnances.

1959 Transistor oscillation and rectifying converter power supply system is filed.

1970 High-Efficiency Power Supply produced from about 1970 to 1995.

1972 Hewlett-Packard's first pocket calculator HP-35 introduced with transistor switching power supply for light-emitting diodes, clocks, timing, ROM, and registers.

1976 "Switched mode power supply" 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 5 MHz - 26,5 GHz phase noise measurement system went with a switched power supply.