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.