What Is Thyristor Rectifier Three-phase Bridge Rectification Circuit?

The phase full-controlled bridge and the double reverse star rectifier circuit are two commonly used rectification methods of the silicon controlled rectifier. Today we analyze what is the three-phase bridge and double reverse star rectified circuit of the silicon controlled rectifier.

Three-phase bridge type fully controlled rectifier circuit

1. Circuit form

2. Working principle

（1）α＝0^o 

For the output voltage of the load end, there must be a thyristor in the common cathode and common anode groups, and the output voltage waveform of the common cathode group is the positive half-period envelope of the three-phase phase power supply waveform. For the common anode group, the output voltage waveform is the negative half cycle envelope of the three-phase phase power supply waveform.

On the three-phase line voltage waveform is the positive half of the envelope.

 (2) When α> 0o

The following picture is α＝30^o、α＝60^o、α＝90^oWaveform

Waveform description：

α≤60^oTime，ud Waveforms are positive；60^o<α<90^oTime，due to Ld effect， ud The waveform appears negative，α＝90^oTime，Positive and negative areas are equal, ud =0.

3. Quantitative relationship:

4. Conclusion:

（1）Phase shift range 0^o~90^o

（2）α≤60^oTime，Continuous load voltage。

（3）The load voltage is the line voltage.

（4）Requirements for trigger pulse:

The three-phase bridge fully controlled rectifier circuit must ensure that both thyristors are turned on at any time to form a loop. In order to ensure that the rectifier can start working or can be turned on again after the current is interrupted, it must be turned on A pair of thyristors add trigger pulse at the same time. One is wide pulse and the other is double narrow pulse.

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