SIMULATION OF DC VOLTAGE REGULATOR USING SCR - Computer Programming

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## Tuesday, June 28, 2011

SIMULATION OF DC VOLTAGE REGULATOR USING SCR

AIM:

To study the operation of DC voltage regulator with R load and observe the waveform using MATLAB 6.5 software.

APPARATUS REQUIRED:

MATLAB 6.5 software

THEORY:

Rectification is a process of converting an AC to DC. The fully controlled converter uses thyristors as the rectifying elements and the Dc output as function of amplitude of the Ac supply voltage and the point at which the thyristors are triggered. During the positive half cycle of the input voltage SCR 1, SCR 2, are forward biased and are simultaneously triggered at the firing angle a. The supply voltage appears across the load resistance R. The load voltage is 0 from p to p+a, until the SCR 3 and SCR 4 are triggered in negative half cycle. The load current now flows from the supply, SCR 3,Load and SCR 4.thus the direction of current through the load is the same in both half cycles. The output voltage is given by the expression.

V0 = Vm / p (1+cosa) volts

CIRCUIT DIAGRAM:

PROCEDURE:

1. Open the SIMULINK library from MATLAB 6.5.
2. Select the components from the blockset.
3.Give the wiring connection as per the circuit diagram.
4. Simulate the circuit and observe the waveform.

MODEL GRAPH :

RESULT:

Thus the operation of fully controlled converter with R load has been studied and the waveforms are observed.