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Three-Phase Half-Bridge with Transformer

  • Overview

    The three-phase half-bridge converter is an extension of the single-phase half-bridge converter, see applet 'Single-Phase Half-Bridge with Transformer' for more details. While the output voltage of the single-phase half-bridge converter shows 2 pulses per mains period, there are 3 pulses in the case of the three-phase half-bridge converter. There is still just one single thyristor in the current path at any time.

  • Operation
    • Change the resistive and inductive components of the load. With increasing inductance, the load current becomes continuous (dependent on the triggering angle).
    • Set a different trigger angle by changing the reference signal (red horizontal line). If the reference signal crosses the triangular signals , the firing pulse triggers the thyristor into the on-state.
    • Drag the time slider from left to right. After passing the triggering point, the trigger pulse is animated. After triggering, the thyristor is in the on-state and the load current keeps flowing until it goes down to zero. Then the thyristor is in the off-state again.
    • Find the natural ignition point be setting the triggering angle to zero.

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