AU-X095 - Sharp Air Conditioner Service Manual (repair manual). Page 23

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The IPM takes a 380 V DC input and generates a 13 V U-phase, V-phase, W-phase and XYZ-phase power supply from
its internal power supply circuit. GND is at CN2 pin 7 and 13 V is output at pin 9.

The 13 V power supply output from IPM is lowered by R15, giving an input voltage of 8 to 9 V to the three-terminal
regulator IC2, and generating the 5 V power supply for the control circuit.

The 5V power supply generated by the control circuit is input to IPM. Inside IPM it is used as the OPIC input power
supply and the fault output power supply. When IPM is operating correctly, the output from pin 10 on CN(2) is HIGH,
turning digital transistor Q5 to ON, and setting CPU input pins 15 and 16 to LOW input.

When IPM detects a fault in the current from the 380 V DC line, or detects an abnormal temperature, CN(2) pin 10 is set
to LOW output, turning Q5 to OFF, and setting CPU pins 15 and 16 to HIGH input. When CPU pin 15 goes to HIGH
input, the internal hardware sets all PWM waveform output (34 to 39) to OFF, and the LOW to HIGH rising edge causes
a software interrupt, causing fault processing to begin. CPU pin 16 is input to monitor the HIGH/LOW input level.

DC 380V

CN2

PM1 (IPM)

13V

IC2

5V

7805

C32

R15

DC 380V

5V

CN2

PM1 (IPM)

5V

C40

Q5

C32

R15

CPU (IC1) pin 15
CPU (IC1) pin 16