ISOLATION
High-Speed PWM Isolation for 3-Phase Inverter
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CASE ANALYSIS
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.
Key decisions
- Use a digital isolator (Si8622) for high-speed, low-jitter signal transfer.
- Maintain separate ground planes (GND_mcu and GND_iso) to preserve isolation.
- Provide an isolated power supply (15V) for the output side of the isolator.
When to reuse this
Essential in industrial motor drives, solar inverters, and any high-voltage system requiring reliable signal isolation across safety barriers.
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circuit-high-speed-pwm-isolation-for-3-phase-inverter-with-si8622-di