EVITP EV Charging Standards 3

Question 1

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

Accepted Answer

+6 V

Answer

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

Question 2

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

Accepted Answer

30 A

Answer

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

Question 3

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

Accepted Answer

1 kHz

Answer

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

Question 4

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

Accepted Answer

State D

Answer

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

Question 5

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

Accepted Answer

Detect connector insertion and latch release to stop charging before unplugging

Answer

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

(EVITP) Electric Vehicle Infrastructure Program Practice Test