The scenario
Design a galvanic isolation barrier for PWM signals between an MCU and MOSFET gate drivers in a three-phase motor inverter to prevent noise coupling and ensure safety.
What is in this drawing
Read the decisions behind it.
01
Use a digital isolator (Si8622) for high-speed, low-jitter signal transfer.
02
Maintain separate ground planes (GND_mcu and GND_iso) to preserve isolation.
03
Provide an isolated power supply (15V) for the output side of the isolator.
Essential in industrial motor drives, solar inverters, and any high-voltage system requiring reliable signal isolation across safety barriers.
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