PTC Principle of Electric Air Conditioner Heater
PTC electric heater is a heater with automatic temperature control and power saving. It uses PTC heat-sensitive ceramic element as heat source, corrugated sheet made of aluminum alloy as heat sink, and is composed of heat sink after bonding and welding.
Electric air conditioner heater PTC generally includes MCU processor, power module Mosfet/IGBT, isolated pre-driver and current detection sensor, etc. The control system transmits the temperature information to the MCU through the temperature sensor, and the MCU continuously adjusts the power of the heater according to the preset program according to the temperature difference by comparing with the target temperature input by the button, so that the temperature in the car reaches the set temperature level and is displayed on the LCD screen in real time. Displays the temperature inside the vehicle and the set temperature.
PTC heaters include PT air heaters and PTC liquid heaters. Since the PTC liquid heater can be arranged in the engine room, it can be used directly for the air-conditioning system of the existing car, and is more widely used in the heating system of the electric car.
PTC application prospect
Since the electric vehicle in 2009, the majority of PTC heaters have been used. Electric vehicles (mainly passenger cars) that have been on the market in the past few years generally use PTC water heater systems or PTC air heater systems to achieve heating functions. For pure electric vehicles, PTC air heating is generally used. This method only needs to replace the traditional automobile air conditioner heater core with PTC air heater, and then supplemented with necessary control equipment, it can be directly applied to electric vehicles.
Plug-in hybrid electric vehicles generally use PTC water heaters. In this way, the traditional car air conditioner heater core is connected in series with the PTC water heater. The warm air core is heated to increase the temperature of the outlet air and blow it directly into the car to realize the heating function in the car.
However, PTC heating consumes a lot of power battery during heating in winter, which seriously shortens the driving range of electric vehicles. Therefore, many current solutions use heat pump systems to achieve air-conditioning heating, and the thermal efficiency can be significantly improved.
