What happens when you plug in
Proximity, pilot, isolation test, and the current negotiation loop.
You'll learn
- Explain what happens when you plug in clearly and accurately
- Read the numbers that define the behaviour
- Apply the idea to a real charging session
Overview
Before a single ampere flows, the car and the post run through a scripted conversation lasting a few seconds.
In depth
- 1Plug detection
Proximity pilot confirms the connector is seated and locked.
- 2Communication start
Control pilot establishes a digital link and exchanges identities.
- 3Isolation test
The post checks the DC circuit is isolated from earth before energising.
- 4Parameter exchange
The car declares its maximum voltage, current and target state of charge.
- 5Current loop
The car requests a current every few hundred milliseconds; the post follows.
- 6Termination
Current ramps to zero, contactors open, the connector unlocks.
Quiz
Handshake order
- 1
Order the session start.
- Plug detection
- Communication start
- Isolation test
- Parameter exchange
- Current flow
Key takeaways
Remember this
- Several checks run before power flows.
- The vehicle requests current continuously.
- Isolation testing protects both sides.
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