Electrical

EV Level 2 AC Charging Architecture

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Level 2 EV charging diagram: EVSE Controller and Contactor communicating via Control Pilot PWM to vehicle inlet, Onboard Charger, and Traction Battery.
Level 2 EV charging diagram: EVSE Controller and Contactor communicating via Control Pilot PWM to vehicle inlet, Onboard Charger, and Traction Battery.
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What it shows

  • The EVSE supplies raw 240V AC; rectification happens on the vehicle's onboard charger
  • Control Pilot uses a 1kHz PWM signal to communicate circuit ampacity limits
  • High-voltage contactors close only after the vehicle drops pilot voltage to 6V

The takeaway

Level 2 EVSEs pass AC mains through safely using pilot handshake signaling; onboard chargers convert to DC.

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