Controlled Rectifier:
i) When SCR are used to convert AC to DC they have controlled output voltage, so it is called a controlled rectifier output.
ii) Diodes conducting immediately after its voltage has become positive.
Uncontrolled Rectifier:
i) In this rectifier, the circuit using diodes only are called uncontrolled rectifier circuit.
ii) Unlike diodes, SCR does not become conducting immediately after its voltage become positive. Because it requires triggering gate pulse for forward conduction of SCR.
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