The present invention of relates to the air conditioning apparatus for an electric vehicle, and more particularly, to fit a plurality of heating elements connected to each of the plurality of switching elements in the arrangement order of the switching elements were mixed in sequence by providing the bare T, a plurality of switching elements to reduce the ripple current (ripple current) according to the difference in current consumption and an object thereof is to extend the life of the battery.
The present invention for this purpose is mounted on the inside of the air conditioning case to heat the blown air, and a PTC heater to a plurality of heating element with a PTC element embedded installed side by side in the interior of the frame, by controlling the current of the battery is applied to the PTC heater in the automobile air conditioning system for including a heater control unit for controlling the heat output of the PTC heater, the heater control unit 7, a controller 8 outputs a control signal to control the heat output of the PTC heater 10, and the a plurality of switching elements (9) for controlling the current of the battery 5 is applied to the plurality of heating elements 14 of the PTC heater 10 in accordance with a control signal from the controller 8, and; A plurality of heating elements coupled to the respective switching element (9a) (9b) (9c), the different heating element group (14a) (14b) (14c) doedoe connection with, the respective switching element (9a) (9b) (9c) group (14a) (14b) (14c) is characterized in that each bridge arrangement bare.