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While prototyping a inverter or a power converter on bread boards we use separate power supply for microcontrollers and separate supply for gate triggering. But how to design a PCB without using separate supply for microcontrollers and gate? How to design a circuit only with input current not any auxiliary supply for microcontrollers?

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    \$\begingroup\$ You're going to have to be a lot more specific. Post your circuit or the exact reason you think you need a separate power supply. That's your claim. \$\endgroup\$
    – MOSFET
    Commented 2 days ago
  • \$\begingroup\$ There are many schemes for "housekeeping" supplies in SMPS. Maybe look at some reference designs from vendors like TI or ADI to get an idea for how they work. \$\endgroup\$
    – John D
    Commented 2 days ago
  • \$\begingroup\$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. \$\endgroup\$
    – Community Bot
    Commented 2 days ago
  • \$\begingroup\$ We don't typically use breadboards for this (any) purpose. They are entirely unsuitable both for AC/DC converters and for switched regulators. If you are building some archaic stuff with LM317 & friends in TO220, then solder them and ideally attach them to a TO220 heat sink while at it. \$\endgroup\$
    – Lundin
    Commented yesterday

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