the energy must stop before it can cross
the energy must stop before it can cross
A flyback converter transfers power across a galvanic isolation barrier not by flowing, but by waiting.
It splits the transmission of energy into two strictly separated temporal phases. When the primary switch closes, current flows into the coupled inductor, but the secondary diode blocks it from reaching the output. The energy is trapped, stored purely as a magnetic field in the core. When the primary switch opens, the magnetic field violently collapses, reversing the polarity and forcing the stored energy out through the secondary winding to the load.
The primary and secondary sides never conduct at the same time. The flyback converter operates as a temporal airlock. To cross the barrier safely, the energy must cease being an electrical current, wait as a static magnetic field, and be reborn on the other side.