Disadvantages of load commutated chopper

Electrical Engineering Power Electronics
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  1. For high power applications, efficiency becomes very low because of high switching losses at high operating frequencies.
  2. Freewheeling diode is subjected to twice the supply voltage.
  3. Peak load voltage is equal to twice the supply voltage.
  4. The commutating capacitor has to carry full load current at a frequency of half chopping frequency.
  5. One thyristor pair should be turned-on only when the other pair is commutated. This can be realized by sensing the capacitor current that is alternating.