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EV Charging Standards Flashcards

7 cards from real EVITP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 EV Charging Standards flashcards as text

  1. Under SAE J1772, what voltage on the control pilot indicates State C (vehicle connected and ready to charge, no ventilation required)?

    Answer: +6 V

    State C is +6 V on the pilot, signaling the vehicle requests energy without ventilation.

  2. A J1772 EVSE broadcasts a 50% PWM duty cycle on the pilot. What maximum current is the vehicle allowed to draw?

    Answer: 30 A

    For 10–85% duty, amps = duty cycle × 0.6, so 50 × 0.6 = 30 A.

  3. What is the nominal frequency of the J1772 control pilot PWM signal?

    Answer: 1 kHz

    The pilot is a ±12 V square wave at 1 kHz.

  4. Which pilot state indicates the vehicle requires ventilation during charging, such as for vented lead-acid batteries?

    Answer: State D

    State D (+3 V) signals charging with ventilation required.

  5. What is the main purpose of the proximity (PP) circuit in a J1772 connector?

    Answer: Detect connector insertion and latch release to stop charging before unplugging

    The proximity resistor network changes when the latch button is pressed, letting the vehicle stop current before contacts break.

  6. In a CCS1 DC charging session, how does the vehicle communicate with the charger?

    Answer: Power-line communication (HomePlug Green PHY) over the control pilot

    CCS uses HomePlug Green PHY PLC superimposed on the pilot line for DIN 70121/ISO 15118 messaging.

  7. Which DC fast-charging standard uses CAN bus communication rather than PLC?

    Answer: CHAdeMO

    CHAdeMO uses a CAN bus link between vehicle and charger.