Samsung RB31FEJNB Series Service Manual page 82

5. PCB/PBA DIAGRAM
5-3) Parts Layout (Inverter Board) A+++
1. PBA Power Supply : Circuit changing the input power to the fridge control power with SMPS.
After converting to 12V and 5V, supply them to Main PBA.
After converting to 15V and 5V, use them for inverter control.
2. Bootstrap Circuit : Independent Power Circuit for IPM High-Phase Driving.
3. Position Sensing Circuit : Detection of Rotor Position by monitoring the U/V/W-Phase of Compressor.
4. IPM : It is a Power Module which consists of HVIC(1), IGBT(6) and Diode(6) and drives the compressor with
IGBT ON/OFF controlling at the Micom.
5. Current Sensing Circuit : It detects the currents taken by the Shunt resistance and does the PWM DUTY
control.
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