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What is Two-transistor forward converter?

In the forward converter, two switching tubes are connected in series with the primary winding of the transformer, and are turned on or off at the same time. The primary side of the transformer is connected like a bridge, and the opposite sides of the bridge arm are two switching tubes and two diodes. The output of the bridge is connected to the primary side of the transformer, and the secondary side circuit is the same as the single-tube forward. Its operating mode is completely different from that of a bridge converter. Since the demagnetization current passes through the diode and the primary winding during Toff, there is no need to separately provide a demagnetization winding. The two-switch forward converter can be used for medium power, and each tube is subjected to a voltage of approximately Vi. Two sets of identical double-switch forward converters are connected in parallel, and the input is connected in series or in parallel. After being connected to the AC/DC rectifier, it can be used for high-power output and input terminal to the rectified output of AC400V or 220 grid.