Nissan Leaf. Manual - part 756
COMPONENT PARTS
HAC-27
< SYSTEM DESCRIPTION >
[AUTO A/C (WITH HEAT PUMP)]
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HAC
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• The IGBT temperature sensor uses the inverter control circuit to monitor for an increase in motor drive circuit
temperature in order to prevent circuit overheating.
• Adopts the HVIL (High-Voltage Interlock Loop) circuit inside the electric compressor, and CPU monitors the
HVIL circuit.
NOTE:
HVIL is composed of the loop circuit in the electric compressor and the high pressure system connector, and
detects connector poor connection, etc. due to open circuit.
• The motor uses a DC brushless motor, with speed control performed by the inverter drive circuit.
PTC Heater
INFOID:0000000010121745
• 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.
JSIIA1771GB
JMIIA2741ZZ