A Half wave rectifier is a device which converts ac voltage to pulsating dcvoltage using one
PN junction diode.The ac voltage (230 V, 50 HZ) is connected to the primary of the transformer.
Thetransformer steps down the ac voltage. Thus, with suitable turns ratio we get desired ac
secondary voltage. The rectifier circuit converts this ac voltage in to a pulsating dcvoltage. Half
wave rectifier conducts during positive half cycle and gives output in the form of positive
sinusoidal pulses. Hence the output is called pulsating dc. A pulsating dc voltage containing large
varying component called ripple in it. The capacitor filter is used after rectifier circuit, which
reduces the ripple content in the pulsating dc. Thus filter converts pulsating dc in to pure dc.
The output of the rectifier is of pulsating dc type. The amount of ac content in theoutput can be
mathematically expressed by a factor called ripple factor.