Product control scheme of high voltage coolant heater 1
PTC water heater can provide heat for the cockpit of new energy vehicles and meet the standard of safe defrosting and defogging. It also provides heat to other parts of the vehicle that require temperature regulation, such as the battery.
1.Feature
Electricity is used to heat the antifreeze，and the heater is used to heat the interior of the car.
Installed in the water cooling circulation system.
Warm air soft temperature controllable.
Adopt PWM to adjust and drive IGBT to adjust power.
With short-term heat storage function.
Vehicle cycle, support battery thermal management.
Environmental protection.
2. Air conditioner control framework
①Complete the command input from the air conditioning panel.
②The air conditioner panel sends the user's operation command to the controller through CAN communication or ON/OFF PWM.
③After the water heating PTC controller receives the command signal, it turns on the PTC in PWM mode according to the power requirement.
Design advantages：
①Using 4-channel PWM control mode, the busbar inrush current is small, and the requirements for the relay in the vehicle circuit are low.
②PWM mode control enables continuous adjustment of power.
③The CAN communication mode can report the working status of the controller, which is convenient for vehicle control and monitoring.
3. Control principle block diagram
