A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin t. The firing angle is a. The dc output voltage is

• A. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/278-277-1.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/278-277-2.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/278-277-3.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/278-277-4.png">