Three-phase bridge rectifier Circuit

One or three-phase bridge rectifier Circuit

Second, the Circuit analysis law

At every moment, according to the principle of priority:

• Diode conduction with the highest anode potential in the common cathode group;
• Diode conduction of the lowest cathode potential in a common anode group.

Third, circuit analysis

During the T1 ~ T2

The U-point potential of the common cathode group is the highest, V1 conduction;

The V-point potential of the common anode group is the lowest, V4 conduction.

The voltage on both ends of the load is the line voltage UUV.

During the T2 ~ T3

The U-point potential of the common cathode group is the highest, V1 conduction;

The W point potential of the common anode group is the lowest, V6 conduction.

The voltage on both ends of the load is the line voltage Uuw.

During the T3 ~ T4

The V-point potential of the common cathode group is the highest, V3 conduction;

The W point potential of the common anode group is the lowest, V6 conduction.

The voltage on both ends of the load is the line voltage UVW.

T4 ~ T5 ...

T5 ~ T6 ...

T6 ~ T7 ...

Conclusion:

In a large cycle, it can be divided into 6 small time periods, each of which is powered by a pair of phase lines for the load.

In a large cycle, each diode has a one-third time conduction (with an angle of 120°).

During a period of 6 hours, the voltage of the load can be seen as a cyclical change.

Iv. calculation

1, Average Output Voltage, VDC

2. RMS Output Voltage

Three-phase bridge rectifier Circuit