Electrical

Inside an EV On-Board Charger (OBC)

Electrical Diagrams · made in Skemio

Block diagram of an EV on-board charger showing EMI filter, PFC stage, DC link, HF transformer, rectifier, and traction battery pack.
Block diagram of an EV on-board charger showing EMI filter, PFC stage, DC link, HF transformer, rectifier, and traction battery pack.
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What it shows

  • EMI filter and Active PFC correct power factor to near 0.99.
  • High-frequency transformer ensures essential galvanic safety isolation.
  • Synchronous rectification converts pulsed AC to smooth, high-voltage DC.

The takeaway

An OBC balances galvanic passenger safety, strict automotive packaging, and high conversion efficiency.

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