Electrical – Three-phase thyristor rectifier – Minimum firing angle

control systemelectricitypower electronicsthyristor

Why is a minimum firing angle (>0, usually 5-15°) defined for three-phase thyristor rectifier?

I would like a technical explanation.

Thanks

Best Answer

The minimum firing angle for a three-phase thyristor is 30 degree. Below thirty degrees the thyristor is already reverse biased by the third thyristor that is already conducting. Let's understand the waveform: Minimum firing angle of three-phase thyristor

If the minimum firing angle is less than 30, the circuit operates in continuous conduction mode instead.

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