The vacuum tubes flared blinding white. The schematic turned a deep, angry purple. The ink lines spiked like a seismograph during an earthquake.
Here lies the genius. The schematic shows a third winding (N3) on the same core as the primary (Np) and secondary (Ns). But N3 is not rectified to DC. Instead, it connects to a variable resonant tank (Cr and Lr) that feeds back into the DC bus’s midpoint. This creates a regenerative snubber —it captures the voltage spike normally wasted as heat during turn-off and recycles it to assist the next switching cycle. xin zhi zhao schematic top