AI3351 High-Voltage PCB-AI3351

This board acts as both a “signal amplifier” and a “protective guard” between the main control board and the IGBT/IGCT power devices. The main control board lacks the capacity to generate the current pulses required to drive high-power devices or to protect them within the necessary millisecond timeframe; this board handles both tasks.

Functional Principles (by signal flow)

1. Signal Input (Fiber Optic Reception): Low-power PWM pulses from the main control board (PEC controller) are transmitted to this board via fiber optics. Fiber optic transmission serves two purposes: providing immunity to electromagnetic interference (EMI)—given the intense 6/12-pulse switching noise within power electronics cabinets—and inherently achieving electrical isolation between the control side and the power side.

2. Opto-isolation and Signal Conditioning: On-board optoelectronic conversion circuits convert the optical signals back into electrical signals, performing level conditioning and de-bouncing to deliver clean PWM square waves to the driver stage. An isolation withstand voltage of ≥2500V AC is maintained between the control side (low-voltage logic) and the power side (high-voltage) to prevent fault voltages from the power side from propagating into the main control system.

3. Drive Amplification (Core Function): The conditioned PWM signal is amplified into standard gate drive pulses:

+15V Turn-on: Positive voltage rapidly charges the IGBT/IGCT gate, ensuring reliable conduction;

−8V Turn-off: Negative bias voltage rapidly and completely turns off the device and “clamps” the gate, preventing spurious conduction caused by dv/dt or external interference (spurious conduction is a common cause of device failure/explosion in medium-voltage variable frequency drives).

The peak drive current for a single channel is ≥3A, ensuring that high-power devices complete switching operations within the microsecond range, thereby minimizing switching losses. 4. Hardware Protection (Key Value): On-board protection circuitry monitors power devices on a pulse-by-pulse basis. Operating independently of the main control software, it offers a response speed that is an order of magnitude faster:

Protection Item | Monitoring Method | Action

Short Circuit / Overcurrent | Real-time monitoring of VCE saturation voltage drop (fault triggered by abnormal rise in conduction voltage drop) | Microsecond-level soft turn-off (avoids hard switching to prevent secondary breakdown caused by turn-off overvoltage)

Driver Undervoltage | Monitoring of gate supply voltage | Inhibit turn-on / Block drive signal

Fault Feedback | Fault dry contact + fiber-optic message sent to main controller | Safe shutdown of the entire cabinet

5. Closed-loop Operation Workflow (One Switching Cycle): Main controller sends PWM → Fiber-optic transmission to board → Isolation and signal conditioning → +15V turn-on → Device conducts → State maintained if VCE is normal → Main controller sends turn-off signal → -8V turn-off → Device turns off; if VCE rises abnormally during conduction → Immediate soft turn-off → Fault feedback to main controller → System reports fault and shuts down.
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