or inductive load pushes thyristor to the edge of the forward blocking voltage then it automatically starts conducting? Yet still have a huge voltage spike which may result in EMI ?
was very dumb question. If inductive load has a nonzero current, at least 2 of the thyristors must be on. Then say we missed the positive thyristor's angle and fired at -5degree. Then nothing will change since the vd is shorted for a small duration and the positive thyristors are reverse biased. And negative thyristors are forward-biased. But if we fire positive thyristors' gate at +5degree, the vd is shorted for a small duration. During this duration, negative thyristors are reverse-biased and turned off. Whereas positive thyristors are positively biased and start conducting.
great work
1:24: How can we be sure that we fire thyristor exactly at fire angle = 0? If we miss it, Do the inductive loads harm our devices?
or inductive load pushes thyristor to the edge of the forward blocking voltage then it automatically starts conducting? Yet still have a huge voltage spike which may result in EMI ?
was very dumb question. If inductive load has a nonzero current, at least 2 of the thyristors must be on. Then say we missed the positive thyristor's angle and fired at -5degree. Then nothing will change since the vd is shorted for a small duration and the positive thyristors are reverse biased. And negative thyristors are forward-biased. But if we fire positive thyristors' gate at +5degree, the vd is shorted for a small duration. During this duration, negative thyristors are reverse-biased and turned off. Whereas positive thyristors are positively biased and start conducting.