The flyback design was developed the 1930s and 1940s, and highly refined in the 1950s with the introduction of commercial television. In addition, there’s the flyback transformer itself (of course, as with any design, the final schematic is more complicated). The core of the flyback design has a fairly short and low-cost bill of materials (BOM): input capacitor, primary-side MOSFET switch, output (secondary)-side rectifier diode, and an output capacitor. This supply-also called a power converter-has two distinct operating phases, with power from the input side transferred to the output side only when the primary-side switch is off and its current flow is zero or close to it. The flyback design is a switched-mode power supply (SMPS) that’s been used for 70+ years and still going strong.
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