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Switch the 2.74k resistor or 1.3k resistor to simulate different states:
States A, B, and C are the core functionality and define the normal operation. An EVSE typically performs several self-tests upon initially powering on and then enters State A. When ready, the normal connection process follows several steps:
1. The EVSE puts 12 V on the pilot wire. This transmission signals the vehicle when the plug is connected.
2. When the plug is connected, the vehicle places a 2.74-kΩ load on the pilot line, which drops the voltage to 9V.
3. The EVSE moves to State B, where the EVSE enables the PWM, which signals the vehicle how much current the vehicle can draw. The EVSE also closes the relays, providing power to the vehicle.
4. The vehicle starts to draw power and switches to the 822-Ω load, which drops the voltage to 6 V, signaling the EVSE that charging has started.
5. Most vehicles continue to pull low amounts of power in state C, even when fully charged, so the charging
process is ended by unplugging the cable, which returns the voltage to 12 V.
The EVSE measures this process and closes the relays and returns to State A.Additional error handling such as missing diodes in the vehicle or an improper connection can be detected and handled by the EVSE by cutting the power, as well.
Can refer to:
https://www.ti.com/lit/ug/tiduf04/tiduf04.pdf?ts=1703404735846&ref_url=https%253A%252F%252Fwww.google.com%252F
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