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COMPONENT PARTS HAC-227 < SYSTEM DESCRIPTION > [AUTO A/C (WITHOUT HEAT PUMP)] C D E F G H J K L M A B HAC N O P • A scroll-type compressor is used. The motor drive force is used to rotate the moveable scroll and perform refrigerant intake, compression, and discharge. PTC Heater INFOID:0000000010121940 • A PTC heater is used as the heat source for heating. • Provides internal control circuit and performs LIN communication with A/C auto amp. • Based on the signals from A/C auto amp., the microcomputer inside PTC heater controls the heater output by PWM Note . NOTE: • PWM (Pulse Width Modulation) is a system that controls current and voltage by changing the duty ratio of a constant frequency pulse wave. • PWM is used as the adjustment method of output voltage when inverter is used as a power supply for controlling motor speed. • PWM changes voltage application time (pulse width) using a semiconductor element and controls PTC heater. • PTC stands for “Positive Temperature Coefficient”, and is a ceramic material with barium titanate as the pri- mary component. • When current is applied, it heats up. Upon reaching a certain tem- perature (Curie temperature) the resistance suddenly increases, limiting the current, and maintaining a constant amount of heating. JSIIA1625GB JMIIA2741ZZ JSIIA1653GB |