Half-Controlled 3Phase

Half-Controlled 3Phase

Half-Controlled 3Phase

1 Nov 2020

In a half-controlled three-phase rectifier, three diodes and three thyristors are used to generate a constant average output voltage according to the amount of input AC voltages



In a half-controlled three-phase rectifier, three diodes and three thyristors are used to generate a constant average output voltage according to the amount of input AC voltages. 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. Therefore, by delaying the trigger pulse time (fire angle), we can delay.
By increasing the number of phases and diodes in the bridge configuration, a higher average DC output voltage with a lower ripple amplitude can be achieved; For example, with a six-phase rectifier, in which each diode conducts only one-sixth of the alternating current. In addition, the ripple frequency of the output voltage of multi-phase rectifiers is higher, and therefore have a softer output. Therefore, 6, 12, 15 and even 24 phase rectifiers can be used to improve the ripple coefficient in various applications.
 
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