How three-phase thyristors work and are used
The three-phase thyristor is a semiconductor device used for alternating current control, which has the advantages of solid controllability and high reliability. It consists of three thyristors that can realize the power of three-phase alternating current. The structure of a three-phase thyristor is similar to that of a single-phase thyristor, which is formed by the alternating arrangement of P-type semiconductors and N-type semiconductors, with a J-junction in the middle. By controlling the gate voltage, the on/off state of the current can be controlled. The difference is that a three-phase thyristor consists of three single-phase thyristors, and the anode of each single-phase thyristor is connected to the cathode of another single-phase thyristor, forming three independent conductive paths.
Control principle of three-phase thyristor
The control principle of the three-phase thyristor is mainly to control the alternating current by controlling the conduction and shutdown of the thyristor. Specifically, when the voltage of the three-phase alternating current exceeds the on-voltage of the thyristor, the thyristor begins to turn on, and the draft starts to flow through. When the current reaches a specific value, the thyristor will remain on until the recent drops below the cut-off current. When the AC voltage passes through the zero point and becomes negative, the thyristor will automatically shut off, and the wind will stop flowing. In this way, the three-phase thyristor can realize the control of alternating current. In addition, by adjusting the trigger angle of the thyristor, the voltage and current output of the rectifier can be changed. When the thyristor is turned on, the wind can usually pass through; When the thyristor is turned off, the current is blocked, allowing the current to be controlled. The three-phase thyristor rectifier can also adjust the output voltage by controlling the trigger pulse width and frequency of the thyristor. By adjusting the width and frequency of the trigger pulse, the on-time and turn-on period of the thyristor can be changed, and the magnitude of the output voltage can be adjusted.
Three-phase thyristors: a new option for power control
In contrast, three-phase thyristors have higher performance and a more comprehensive range of application prospects. A three-phase thyristor is a three-port semiconductor device with three positive electrodes, three negative electrodes, and three control electrodes. It can realize the on-off control of the three-phase AC power supply by controlling the voltage of the control pole.
Compared with ordinary thyristors, three-phase thyristors have the following advantages:
1.Lower conduction loss: Since the three-phase thyristor can control three phases of switching simultaneously, its conduction loss is lower, making it suitable for high-power, high-current application scenarios.
2.Better thermal stability: The three phases of the three-phase thyristor can be controlled independently, which makes it more thermally stable and improves the reliability and lifetime of the device.
3.Higher frequency: Since the three-phase thyristor has a higher switching frequency, higher power control accuracy and faster response time can be achieved.
Application case: application of three-phase thyristor in power electronic equipment
In power electronics, three-phase thyristors are used in various applications. For example, in power inverters, three-phase thyristors can realize the function of converting direct current to alternating current. In the inverter, the three-phase thyristor can realize the adjustment of the power supply frequency. In power supplies, three-phase thyristors can achieve a stable output of voltage. These applications require high-precision, high-efficiency power control, and three-phase thyristors meet these needs.
Development: A new revolution in power control
With the continuous development of power electronics technology, ordinary thyristors have made it challenging to meet the needs of high-performance power electronic equipment. The advent of the three-phase thyristor has brought a new revolution to power electronic equipment. It has the advantages of lower conduction losses, better thermal stability, and higher frequencies, resulting in a significant improvement in the performance of power electronics. Therefore, three-phase thyristors will become one of the important development directions of power electronic equipment in the future.
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