Twelve-Pulses Thyristor

Twelve-Pulses Thyristor

Twelve-Pulses Thyristor

1 Nov 2020

Most power electronics designers and high-powered drives use multi-pulse rectifiers in the input section to achieve the requirements stated in IEEE519. These rectifiers are divided into 12, 18 and 24 pulse models and are powered by phase shifted transformers.



Most power electronics designers and high-powered drives use multi-pulse rectifiers in the input section to achieve the requirements stated in IEEE519. These rectifiers are divided into 12, 18 and 24 pulse models and are powered by phase shifted transformers.
An important feature of multipulse rectifiers is their ability to reduce the harmonic current of the line. LC filters or power factor compensators will usually not be needed and potential LC resonances will be eliminated. The use of phase shifted transformers is an effective way to block common mode voltages generated by rectifiers and inverters in MV level drives.
 
 
Six-Pulse Thristor (Graetz Bridge)

Fully controlled three-phase bridge rectifiers are known as the most common AC to DC converters. Fully controlled bridge converters are widely used in controlling the output voltage of power exchangers by electrochemical processes and can be formed simply by placing six thyristors instead of six rectifier diodes. Thyristors are three-ended semiconductor components that conduct current when a suitable trigger pulse is applied to their gate and their anode-cathode voltage is positive.

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21 Nov 2020
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