Single phase Full Bridge Rectifier in tamil

Single Phase Full Converter (Fully Controlled Bridge Converter) The circuit diagram of a single phase fully controlled bridge converter with a resistive and highly inductive load so that the load current is continuous and ripple free (constant load current operation). The fully controlled bridge converter consists of four thyristors T1 , T2 ,T3 and T4 connected in the form of full wave bridge configuration. Each thyristor is controlled and turned on by its gating signal and naturally turned off when a reverse lvoltage appears across it. During the positive half cycle the upper line of the transformer secondary winding is at a positive potential with respect to the lower end. The thyristors T1 andT2 are forward biased during the time interval ωt = 0 to π . The thyristors T1 andT2 are triggered simultaneously at ωt =α ; (0 ≤α ≤π ). The load is connected to the input supply through the conducting thyristors T1 andT2. The output voltage across the load follows the input supply voltage. Due to the inductive load T1 andT2 will continue to conduct beyond ωt =π , even though the input voltage becomes negative. T1 and T2 conduct together during the time period α to (π +α), for a time duration of π radians (conduction angle of each thyristor = 1800 ) During the negative half cycle of input supply voltage from ωt =π to 2π the thyristors T3 and T4 are forward biased. T3 and T4 are triggered at ωt = (π +α). As soon as the thyristors T3 and T4 are triggered a reverse voltage appears across the thyristors T1 and T2 . They naturally gets turned off and the load current is transferred from T1 and T2 to the thyristors T3 and T4. The output voltage across the load follows the supply voltage after π +α upto (2π +α). In the next positive half cycle when T1 andT2 are triggered, T3 and T4 are reverse biased and they gets turned off. The figure shows the waveforms of the input supply voltage, the output load voltage, the constant load current with negligible ripple and the input supply current. Thank you for watching