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That PCB transformer design is interesting.

• amelius 1y ago
  Was this done to save costs? I can't imagine any other reason.
  • kees99 1y ago
    The opposite. Planar (PCB-based) transformers are more expensive to make, but allow much tighter control over where wires and insulation go. A properly designed one will be significantly more compact for the same power rating (compared to wire-wound one). They are quite common in high-wattage high-reliability power supplies like modular PSUs in rack-mount servers.
    • amelius 1y ago
      I suppose it uses blind/buried vias then, to explain the costs.
      • kees99 1y ago
        Blind vias, yes. Also - compared to average 4/6-layer PCB - thicker copper layers, thicker metalization of vias, more layers, thicker board overall.