How to achieve synchronous control of multiple phase-controlled thyristors?

Introduction to Phase-Controlled Thyristors

With the development of power electronics technology, phase-controlled thyristors, as an important power electronic device, have been widely used in power systems. However, when multiple phase-controlled thyristors need to be controlled simultaneously, how to achieve their synchronous control becomes an important issue. This article will introduce the characteristics and applications of phase-controlled thyristors, as well as how to select and implement synchronous control of multiple phase-controlled thyristors.

 phase-controlled thyristors图2

Characteristics of phase-controlled thyristors

A phase-controlled thyristor is a fully controlled power electronic device with the following characteristics:

1. Fast switching speed: Phase-controlled thyristors can switch at high speed, thereby achieving precise control of current.

2. High efficiency: Due to its semiconductor characteristics, phase-controlled thyristors have lower power consumption and higher efficiency.

3. Good thermal stability: Phase-controlled thyristors have good thermal stability and can work in high-temperature environments.

4. Precise control: By controlling the gate voltage, the switching time of the phase-controlled thyristor can be precisely controlled, thereby achieving precise current control.

Application of phase-controlled thyristors

Phase-controlled thyristors are widely used in power systems, mainly including the following aspects:

1. Power regulation: By controlling the switching time of the phase-controlled thyristor, precise regulation of the voltage and current of the power system can be achieved.

2. Power supply control: In switching power supplies, phase-controlled thyristors can be used to control the switching of the power supply to achieve stable output of the power supply.

3. Motor control: In motor control, phase-controlled thyristors can be used to realize the starting, speed regulation, and braking of the motor.

4. New energy power generation: In the field of new energy generation, such as solar and wind energy, phase-controlled thyristors can be used to control the power output of the power generation system.

phase-controlled thyristors图1

How to achieve synchronous control of multiple phase-controlled thyristors?

The following measures need to be taken to achieve synchronous control of multiphase-controlled thyristors:

1. Use synchronous trigger signals: Use a unified trigger signal to synchronize the switching times of multiple phase-controlled thyristors. This trigger signal can be generated using a synchronization signal generator.

2. Adjust the trigger delay time: Since the switching time of each phase-controlled thyristor may be slightly different, the trigger delay time needs to be adjusted to ensure that all thyristors trigger at the same time point; this can be achieved by fine-tuning the delay time of the trigger circuit.

3. Use the same control signal: For multiple phase-controlled thyristors, the same control signal should be used to control their switching states; this can be achieved by connecting them to the same controller or using the same PWM signal to control them.

4. Connection and debugging: Connect all phase-controlled thyristors, trigger circuits, and synchronization signal generators, and then debug. It is necessary to check whether all thyristors are turned on or off at the correct moment. If there is a problem, the trigger circuit or synchronization signal generator needs to be adjusted.

5. Select a suitable drive circuit: In order to ensure reliable triggering of the phase-controlled thyristor, a suitable drive circuit needs to be selected. The drive circuit should be able to provide sufficient drive signal power and reliably deliver the trigger signal to the thyristor. In addition, the drive circuit should also have a protection function to prevent damage to the thyristor due to overvoltage, overcurrent, and other abnormal conditions.

6. System simulation and verification: In order to ensure that the synchronous control of multiple phase-controlled thyristors can operate stably in practical applications, system simulation and verification need to be performed. The performance and stability of the system can be predicted through simulation, and the correctness and feasibility of the design can be confirmed through experimental verification.


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