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=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.
(2) When α> 0o
The following picture is α=30o、α=60o、α=90oWaveform
Waveform description:
α≤60oTime,ud Waveforms are positive;60o<α<90oTime,due to Ld effect, ud The waveform appears negative,α=90oTime,Positive and negative areas are equal, ud =0.
3. Quantitative relationship:
4. Conclusion:
(1)Phase shift range 0o~90o
(2)α≤60oTime,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.
If any questions about rectifier, call us:
+86 13810151476
alice@bjgreenpower.com
website: www.gprectifier.com
Company video: https://youtu.be/VMMHVM-iDn0
Connect on Linkedin: https://www.linkedin.com/in/alice-lee-20b63515b/