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State the function of bleeder resistance in LC filter

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written 6.1 years ago by |

• The resistance RB connected across the capacitor is called as bleeder resistance. It is used to maintain a continuous current through the filter inductance L.

• If the current through L is not continuous i.e. if it is interrupted then a large back emf (L di/dt) will be developed across the inductor.

• This voltage may exceed the PIV rating of the rectifier diodes and damage them. This voltage may exceed the maximum rated voltage of the capacitor as well.

• Hence the induced back emf is dangerous for diodes as well as the capacitor.

• The back emf will not appear if the current through L is continuous RB will maintain a continuous current through L.

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