What Is Thyristor Rectifier Three-phase Bridge Rectification Circuit?

May 31, 2020
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

thyristor-rectifier-three-phase-bridge

2. Working principle

1)α=0o 

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.

 waveform-1

 (2) When α> 0o

The following picture is α=30oα=60oα=90oWaveform

        waveform-2

 

Waveform description

α≤60oTimeud Waveforms are positive60o<α<90oTimedue to Ld effectud The waveform appears negative,α=90oTimePositive and negative areas are equalud =0.

3. Quantitative relationship:

formula 

4. Conclusion:

1Phase shift range 0o~90o

2α≤60oTimeContinuous load voltage

3The load voltage is the line voltage.

4Requirements 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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