Temperature Sensor (PT1000 or NTC) of EV Charging Connectors

----SENKU MACHINERY

Why Are Temperature Sensors Needed in EV Charging Connectors?

To mitigate the risk of overheating during electric vehicle (EV) charging, it is crucial to monitor the temperature of EV charging connectors (such as plugs or sockets) in real time, especially in high-output current systems (typically ≥ 60A). When the temperature of an EV connector exceeds a certain threshold, the charging system will either reduce the output power or completely shut down the charging process. Both the EV charging station and the electric vehicle are equipped with such temperature detection systems.

For example, a 250A CCS2 EV DC plug wiring diagram might look like this:

In the diagram, you can see the CCS2 plug's power contacts (DC+ and DC-) are monitored by PT1000 temperature sensors. Each PT1000 sensor has two wires, labeled as T1, T2, T3, and T4:

· T1 and T2 monitor the DC+ power contact of the CCS2 plug.

· T3 and T4 monitor the DC- power contact of the CCS2 plug.

Working Principle of PT1000 Sensor

The resistance of a PT1000 sensor changes with temperature. As the temperature increases, the resistance value of the PT1000 also increases. This proportional relationship between resistance and temperature can be used to monitor and control the charging process.

The sensor's resistance value is sent to the charging station system. When the temperature becomes too high, the system responds with either an NC (normally closed) or NO (normally open) signal, depending on the configuration. For instance:

When the temperature is 0°C, the PT 1000 resistance value is 1000Ω:

If set the resistance value to a maximum of 1000Ω, If below 1000Ω, the signal is NO, and when the resistance value is greater than 1000Ω, the system will obtain an NC signal.

On the contrary, If set the resistance value to a maximum of 1000Ω, If below 1000Ω, the signal is NC, and when the resistance value is greater than 1000Ω, the system will obtain an NO signal.

At 0°C, the PT1000 resistance is 1000Ω.

If the system is configured to treat resistance values below 1000Ω as NO and above 1000Ω as NC, the system will respond accordingly when the temperature rises and the resistance exceeds 1000Ω.

Conversely, if the system treats values below 1000Ω as NC and above 1000Ω as NO, the signals will be reversed.

Find more different EV charging connectors here!

Note:

· The above values are illustrative and can be adjusted according to system requirements.

· You can set the maximum resistance value based on your specific needs and system design.

Tags: #pt1000 #ev charging connector #ccs plug