Explain the basic characteristics and power relationship of the three-phase bridge fully controlled rectifier circuit

The basic characteristics of the three-phase bridge fully controlled rectifier circuit are as follows:

1. Voltage controllable: By controlling the conduction angle of the rectifier, the voltage can be precisely controlled.

2. Controllable current: While the voltage is controllable, the current can be controlled by controlling the load resistance, the conduction angle of the rectifier and the trigger pulse width.

3. Low energy consumption: Since the rectifier only conducts the current in the positive half cycle or the negative half cycle, it can reduce energy consumption and loss and improve energy efficiency.

4. Small current harmonics: The current waveform of the three-phase bridge fully controlled rectifier circuit is relatively stable, and the harmonic level is low, which reduces the interference to the power supply.

5. Multi-function: Since the voltage and current are controllable, it can also realize functions such as fast reversal and multi-stage speed control. It is widely used in motor speed regulation, frequency converter, UPS and other fields.

6. High efficiency: The current waveform is stable, the harmonics are small, and the loss is small, thus improving the efficiency of the circuit.

7. High reliability: The rectifier has strong voltage resistance and also has over-current, over-temperature and other protection functions to ensure the stable operation of the circuit.

In short, the three-phase bridge fully controlled rectifier circuit has the advantages of controllability, energy saving, strong applicability and high reliability, and is gradually being widely used in various power electronics application fields.

The relationship between the power of the three-phase bridge fully controlled rectifier circuit

The power relationship of the three-phase bridge fully controlled rectifier circuit can be expressed by the following formula:

V_d = V_p * k

Among them, V_d is the DC output voltage of the rectifier circuit, V_p is the power supply voltage (AC voltage), and k is the conduction angle of the thyristor (between 0 and π).

In a three-phase bridge fully controlled rectifier circuit, the output voltage and output current are affected by many factors such as power supply voltage, load resistance, rectifier conduction angle, trigger pulse width, phase, etc.

The power value in the circuit is the product of voltage and current, that is, power = voltage × current. Therefore, when controlling the conduction angle of the rectifier and the trigger pulse width, the voltage and current in the circuit can be affected, thereby affecting the power value of the circuit.