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A kind of rectifier circuit is widely used in manufacturing industry. Its essence is the series connection of three-phase half wave controlled rectifier circuit with one group of common cathode and one group of common anode. The thyristor module (VT3, VT3) is conventionally connected with one anode.

The three-phase rectifier transformer uses dy connection, because the common anode group is connected to the positive half cycle of the power supply, the positive current passes through the secondary winding of the transformer, the common cathode group is connected to the negative half cycle of the power supply, and the reverse current passes through the secondary winding of the transformer. Therefore, in one cycle, there is no DC magnetomotive force in the transformer winding, which helps to reduce the harmonics in the transformer flux and electromotive force.
In addition, it is customary to expect the thyristor module to conduct from 1 to 6, so the thyristor module is numbered in the order shown in the figure, that is, the three thyristors connected with a, B and e three-phase power supply in the common cathode group are VT1, VT3 and vT5 respectively, and the three thyristors connected with a, B and e three-phase power supply in the common anode group are vt4, VT6 and vt2 respectively.

The three-phase bridge fully controlled rectifier circuit must be triggered by double narrow pulse or wide pulse. The phase-shifting area is 0 ° to 120 ° and the maximum conduction angle is 120 °. It is mainly used in places with high demand for voltage control or inverter.

Features and advantages

1. Compact design, two screw installation

2. Heat transfer and isolation by direct copper plate (low r th)

3. Low resistance and high reliability in steady state

4. High surge current

5. Glass passivated thyristor chip

6. Maximum 1600 V reverse voltage, isolation voltage 3000 V~

application area

1. DC and AC drives

2. Controlled field rectifier of DC motor

3. Controlled battery charger

4. Power supply of DC power supply equipment

5. Input rectifier of PWM inverter

6. SMPS input rectifier

7. Soft start capacitor charging

Principle of three phase full control rectifier bridge module

As shown in the figure, the rectifier bridge module is controlled by the control angle of the controller. When the control angle is 0 ° to 90 °, the rectifier bridge module is in the rectification mode, and the average value of the output voltage is positive; when the control angle is 90 ° to 180 ° - γ (γ is the arc changing angle), the rectifier bridge module is in the inversion mode, and the average value of the output voltage is negative.

The primary winding of transformer is connected in triangle, and the secondary winding is connected in star. Six rectifying diodes are arranged according to their turn-on order. VD1, VD3 and vd53 diodes form a common cathode three-phase half wave rectifier. VD2, VD4 and vd63 diodes form a common anode three-phase half wave rectifier. Inductance L and resistance R are connected in series to form a resistive load. Assuming that the input three-phase voltages are symmetrical, the input reactance on the AC side can be neglected, and the load inductance on the DC side is large enough.

The above is the explanation of three-phase full control rectifier bridge by the rectifier module manufacturer semipower. Semipower is a power semiconductor power module manufacturer with power electronics technology as its professional field. It provides the formulation, production, processing and production of semiconductor power modules for enterprises and companies. In addition, it also provides the processing projects of supplied materials or OEM for enterprises. The main products are: IGBT module, thyristor (thyristor) module, ultra fast recovery epitaxial diode module, single-phase rectifier bridge module, three-phase rectifier bridge module, rectifier diode module, Schottky diode power module and other power semiconductor electronic components