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#half-wave rectifier

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Rectifiers, Filters and Applications

The diode in a half-wave rectifier conducts during:

**Rectifier applications** diode must have reverse breakdown voltage higher than peak inverse voltage, centre-tap transformer provides two opposite phase voltages for full-wave, capacitor discharges through load R_L when diode off, drift current in junction is minority carrier motion due to field, diffusion due to gradient, diode conducts when forward biased anode positive. In a half-wave rectifier, the diode is forward biased and conducts only during the positive half-cycle of the AC input, blocking the negative half-cycle. Substituting values gives Positive half-cycle, which matches expected

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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Rectifiers, Filters and Applications

In a half-wave rectifier, the output voltage appears across the load during:

**Capacitor filter** purpose to reduce ripple, capacitor charges to peak during diode conduction and discharges through load during non-conduction, time constant τ = R C, larger RC less ripple, ripple reduced by using capacitor or LC filter, output of half-wave without filter is pulsating half sinusoids, full-wave without filter is two half sinusoids per cycle. A half-wave rectifier conducts only during the positive half-cycle of the AC input, allowing current through the load only in that period, producing a pulsating output for half the cycle. Substituting values gives Positive half-cycle, w

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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Rectifiers, Filters and Applications

The output of a half-wave rectifier without a filter is:

**Rectifier** converts AC to DC using diode unilateral conduction, half-wave conducts only during positive half-cycle when forward biased, output pulsating DC with frequency equal to input 50 Hz, full-wave with centre-tap uses two diodes conducting alternate half-cycles, output frequency 100 Hz for 50 Hz input, 120 Hz for 60 Hz input, output voltage closer to peak with capacitor filter. A half-wave rectifier outputs only the positive half-cycles of the AC input, producing a pulsating DC voltage without a steady value unless filtered. Substituting values gives Pulsating DC, which matches expect

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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