Why is a minimum firing angle (>0, usually 5-15°) defined for three-phase thyristor rectifier?
I would like a technical explanation.
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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:
If the minimum firing angle is less than 30, the circuit operates in continuous conduction mode instead.