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Detailed comparison between asemi three-phase rectifier bridge and single-phase rectifier bridge
2022-04-23 14:46:00 【qyx3868】
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The power supply of common equipment includes AC and DC .
Electric lights and motors use alternating current , Electronic circuits and communication equipment require direct current . AC power can be obtained directly from the power supply grid , The most economical and convenient way to obtain DC power supply is to convert the AC provided by the power grid into DC .
The process of converting alternating current into direct current is called rectification , The device that rectifies is called a rectifier . The rectifier uses the unidirectional conductivity of semiconductor diodes to convert alternating current into direct current .
One of the most commonly used is the bridge rectifier, also known as the rectifier bridge . Many people are familiar with single-phase rectifier bridge , But not necessarily familiar with three-phase rectifier bridge . The following figure shows the three-phase rectifier bridge and wiring diagram :
This picture shows a single-phase rectifier bridge stack , Look for the , Different number of pins , Pin definitions are also different . The middle two pins are AC input terminals , Both sides are DC positive and negative output terminals .
Single phase rectifier bridge circuit
The single-phase bridge rectifier circuit is shown in the figure . In the circuit 4 Two diodes are connected in the form of a bridge , So it is called bridge rectifier circuit . Compared with single-phase full wave rectifier circuit , The advantage of single-phase bridge rectifier circuit is that the transformer does not need center tap , Higher utilization of transformers , The reverse voltage of the rectifier diode is halved , So it's widely used .
Three phase rectifier bridge circuit
In practice , Use three-phase bridge rectifier circuit . The three-phase rectifier bridge circuit has high output power 、 The output voltage ripple is small 、 Transformer is widely used in electrical equipment because of its high utilization . The primary transformer used in the three-phase rectifier bridge circuit is connected into a triangle , The secondary is connected into a star .
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