The diagram above illustrates an AC voltage regulator circuit built using bidirectional thyristors. Unlike its unidirectional counterpart, this circuit is notably simpler and more reliable. As the grid voltage dips below 220V, the control pole voltage of the triac SCR2 correspondingly decreases, leading to a reduced conduction angle in VD2. This causes an increase in voltage at the C1 terminal, which in turn raises the control voltage for the triac SCR1, boosting the output voltage. Conversely, when the grid voltage rises, the output voltage decreases, thus achieving effective regulation.
This design proves advantageous in scenarios where precise voltage control is required without the complexity of additional components. By leveraging the properties of bidirectional thyristors, the circuit ensures stable performance across varying input voltages, making it a preferred choice in many industrial and domestic settings.
In addition to its simplicity, the bidirectional thyristor regulator offers enhanced reliability due to fewer parts prone to failure. Its robust nature makes it particularly suitable for environments where frequent voltage fluctuations are common, such as in industrial machinery or home appliances. Furthermore, the circuit’s adaptability to different load conditions ensures consistent performance, reducing maintenance costs and improving overall system longevity.
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