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.
The paper contained only a single, cryptic schematic. To the untrained eye, it looked like a standard bridge converter: four switches in an "H" pattern. But Li Wei noticed the anomaly. In a typical , the transformer sits in the middle, with primary and secondary windings clearly separated. In Zhao's drawing, however, there was an asymmetrical tertiary winding —a third loop—connected not to ground or output, but back to a floating resonant capacitor. xin zhi zhao schematic top
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: Clicking a component automatically highlights the entire connected circuit path on the PCB, simplifying the search for short circuits or broken traces. Instead, it connects to a variable resonant tank
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