Disadvantages of unidirectional or half-wave ac voltage controller

Due to the presence of diode on the circuit, the control range is limited and the effective RMS output voltage can be varied between 70.7% and 100%.

  1. The input current and output voltage are asymmetrical and contain a dc component.If there is an input transformer, sdaturation problem will occur
  2. It is only used for low power resistive load.
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