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SCR Half wave Phase Control Rectifier in tamil

How SCR functions as a Half Wave Rectifier ? SCRs are very useful in ac circuits where they may serve as rectifiers whose output current can be controlled by controlling the gate current. An example of this type of application is the use of SCRs to operate and control dc motors or dc load from an ac supply. The circuit using an SCR as an half-wave rectifier is shown in figure. The ac supply to be rectified is applied to the primary of the transformer ensuring that the negative voltage appearing at the secondary of the transformer is less than reverse breakdown voltage of the SCR. The load resistance RL is connected in series with anode. A variable resistance r is inserted in the gate circuit for control of gate current. If the angle at which the SCR starts conducting (i.e. firing angle) is a, the conduction will take place for (∏ – α) radians. Controlled Rectifiers: Controlled rectifiers are line commutated ac to dc power converters which are used to convert a fixed voltage, fixed frequency ac power supply into variable dc output voltage. TYPES OF CONTROLLED RECTIFIERS Half wave controlled rectifier which uses a single thyristor device (which provides output control only in one half cycle of input ac supply, and it provides low dc output). semi-converter (half controlled bridge converter, using two SCR’s and two diodes, to provide single quadrant operation). full converter (fully controlled bridge converter which requires four SCR’s, to provide two quadrant operation). Thank You for watching