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We don't get negative half cycles at a rectifier's output only in a positive supply.

If the supply is for a negative voltage, then there will be no positive half cycles at the output.

Read a bit more about rectification.

We don't get negative half cycle in rectifier outputs because the negative part of the supply only shows up across the diode when it is in the reverse bias and blocked (acting like an open switch) there by making the output voltage zero at that instant.

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13y ago

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