Advantages and disadvantages of choke input (LC) filter

There are some advantages of choke input (LC) filter are as given below,

  • The choke input (LC) filter has a high output D.C voltage.
  • It has no loading effect on the rectifier and power transformer.
  • The diode does not have to carry surge currents.
  • It has a very low ripple factor as compared to series inductor filter and shunt capacitor filter.
  • It has very good load regulation.
  • It has no loading effect on the rectifier and power transformer.
  • It has better voltage regulation than that of π filter.

There are some disadvantages of choke input (LC) filter are as given below,

  • It cannot be used together with half wave rectifier.
  • Due to inductor it produces the audible noise.
  • It is not useful for very low load currents.
  • There is a loss of power in the series inductor due to its DC resistance.
  • It has low output D.C. voltage than that of π type filter.
  • It has high ripple factor than that of π type filter.
  • It becomes costly due to the use of large value of an inductor L and a capacitor C.
  • The use of bleeder resistor increases the rating of rectifier circuit.

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