Controlled Rectifier

Controlled RectifierIntroductionTheir operation makes them suitable for use in medium to high-voltage AC power control applications, such as lamp dimming, regulators and motor control.SCRs and similar devices are used for rectification of high power AC inhigh-voltage direct currentpower transmission. They are also used in the control of welding machines.

Introduction

Controlled Single Phase Half Wave Rectifier

ExampleA controlled half wave rectifier is operated to produce an average voltage of 40V across 100ohm load resistor from 120Vrms 60Hz ac source. Determine the delay angle, power absorbed by the resistance and the power factor.

Controlled Single Phase Full Wave Rectifier

ExampleA controlled full wave bridge rectifier has source of 120Vrms at 60Hz, R=20ohm, and =40o . Determine:Average current in the loadPower absorbed by the loadThe source volt-amperes.

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RL Load, Discontinuous Current

ProblemsA controlled full-wave bridge rectifier has a source of 120 V rms at 60 Hz, R=10 ohm, L=20 mH, and =60o. Determine:(a) an expression for load current(b) The average load current(c) the power absorbed by the load

Problem

Controlled Three Phase Half Wave Rectifier

Controlled Three Phase Full Wave Rectifier

ExampleThree phase controlled rectifier has input voltage of 480Vrms, 60Hz. The load is R=10ohm and L=50mH. Determine:The delay angle required to produced an average current of 50A in the loadThe amplitude of harmonics n=6 and n=12.

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