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Before the mid-20th century, controlling large amounts of electricity was a mechanical and often inefficient task.

: By the 1970s and 80s, the development of the Power MOSFET and the IGBT (Insulated-Gate Bipolar Transistor) gave engineers the ability to switch power at high frequencies with incredible precision. This led to the creation of the switch-mode power supplies (SMPS) that today make our laptops and phone chargers compact and light. Power Electronics Today: The Silent Force Introduction to Power Electronics - IQY Technical College Download Power Electronics (1) pdf

The "deep story" of modern power electronics truly started with the shift from vacuum tubes to solid-state physics. Before the mid-20th century, controlling large amounts of

: These early, glowing vacuum devices allowed for the electrification of railways and early industrial processes, though they were limited by their massive size and low reliability. The Semiconductor Revolution (1956–1980s) Power Electronics Today: The Silent Force Introduction to

: The journey began in 1902 with Peter Cooper Hewitt's invention of the mercury-arc rectifier , the first device capable of converting alternating current (AC) into direct current (DC) at a meaningful scale.